10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to             

Commission File Number: 1-13087 (Boston Properties, Inc.)

Commission File Number: 0-50209 (Boston Properties Limited Partnership)

BOSTON PROPERTIES, INC.

BOSTON PROPERTIES LIMITED PARTNERSHIP

(Exact name of Registrants as specified in its charter)

Boston Properties, Inc.	Delaware	04-2473675
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
Boston Properties Limited Partnership	Delaware	04-3372948
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199-8103

(Address of principal executive offices) (Zip Code)

(617) 236-3300

(Registrants’ telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Registrant	Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Boston Properties, Inc.	Common Stock, par value $.01 per share	BXP	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

Registrant	Title of each class
Boston Properties Limited Partnership	Units of Limited Partnership

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    

Boston Properties, Inc.:    Yes  ☒    No  ☐        Boston Properties Limited Partnership:    Yes  ☒    No  ☐            

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    

Boston Properties, Inc.:    Yes  ☐     No  ☒        Boston Properties Limited Partnership:    Yes  ☐     No  ☒    

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    

Boston Properties, Inc.:    Yes  ☒    No  ☐        Boston Properties Limited Partnership:    Yes  ☒    No  ☐        

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Boston Properties, Inc.:    Yes  ☒    No  ☐        Boston Properties Limited Partnership:    Yes  ☒    No  ☐    

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Boston Properties, Inc.:    

Large Accelerated Filer  ☒         Accelerated Filer  ☐        Non-accelerated Filer  ☐         Smaller Reporting Company  ☐

Emerging Growth Company  ☐

Boston Properties Limited Partnership:

Large Accelerated Filer  ☐         Accelerated Filer  ☐         Non-accelerated Filer  ☒           Smaller Reporting Company  ☐         

Emerging Growth Company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards pursuant to Section 13(a) of the Exchange Act.

Boston Properties, Inc. ☐  Boston Properties Limited Partnership ☐ 

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

Boston Properties, Inc. ☒ Boston Properties Limited Partnership ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements

of the registrant included in the filing reflect the correction of an error to previously issued financial statements.

Boston Properties, Inc. ☐  Boston Properties Limited Partnership ☐ 

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).

Boston Properties, Inc. ☐  Boston Properties Limited Partnership ☐ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    

Boston Properties, Inc.:    Yes  ☐   No  ☒        Boston Properties Limited Partnership:    Yes  ☐    No  ☒    

As of June 30, 2022, the aggregate market value of the 156,405,989 shares of Common Stock held by non-affiliates of Boston Properties, Inc. was $13,917,004,905 based upon the last reported sale price of $88.98 per share on the New York Stock Exchange on June 30, 2022. (For this computation, Boston Properties, Inc. has excluded the market value of all shares of Common Stock reported as beneficially owned by executive officers and directors of Boston Properties, Inc.; such exclusion shall not be deemed to constitute an admission that any such person is an affiliate of Boston Properties, Inc.).

As of February 21, 2023, there were 156,822,702 shares of Common Stock of Boston Properties, Inc. outstanding.

Because no established market for common units of limited partnership of Boston Properties Limited Partnership exists, there is no market value for such units.

Certain information contained in Boston Properties Inc.’s Proxy Statement relating to its Annual Meeting of Stockholders to be held May 23, 2023 is incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. Boston Properties, Inc. intends to file such Proxy Statement with the Securities and Exchange Commission not later than 120 days after the end of its fiscal year ended December 31, 2022.

EXPLANATORY NOTE

This report combines the Annual Reports on Form 10-K for the fiscal year ended December 31, 2022 of Boston Properties, Inc. and Boston Properties Limited Partnership. Unless stated otherwise or the context otherwise requires, references to “BXP” mean Boston Properties, Inc., a Delaware corporation and real estate investment trust (“REIT”), and references to “BPLP” and the “Operating Partnership” mean Boston Properties Limited Partnership, a Delaware limited partnership. BPLP is the entity through which BXP conducts substantially all of its business and owns, either directly or through subsidiaries, substantially all of its assets. BXP is the sole general partner and also a limited partner of BPLP. As the sole general partner of BPLP, BXP has exclusive control of BPLP’s day-to-day management. Therefore, unless stated otherwise or the context requires, references to the “Company,” “we,” “us” and “our” mean collectively BXP, BPLP and those entities/subsidiaries consolidated by BXP.

As of December 31, 2022, BXP owned an approximate 89.6% ownership interest in BPLP. The remaining approximate 10.4% interest was owned by limited partners. The other limited partners of BPLP (1) contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP or (2) received long-term incentive plan units of BPLP pursuant to BXP’s Stock Option and Incentive Plans, or both. Under the limited partnership agreement of BPLP, unitholders may present their common units of BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of the units that may restrict such right for a period of time, generally one year from issuance). Upon presentation of a common unit for redemption, BPLP must redeem the unit for cash equal to the then value of a share of BXP’s common stock. In lieu of a cash redemption by BPLP, however, BXP may elect to acquire any common units so tendered by issuing shares of BXP common stock in exchange for the common units. If BXP so elects, its common stock will be exchanged for common units on a one-for-one basis. This one-for-one exchange ratio is subject to specified adjustments to prevent dilution. BXP generally expects that it will elect to issue its common stock in connection with each such presentation for redemption rather than having BPLP pay cash. With each such exchange or redemption, BXP’s percentage ownership in BPLP will increase. In addition, whenever BXP issues shares of its common stock other than to acquire common units of BPLP, BXP must contribute any net proceeds it receives to BPLP and BPLP must issue to BXP an equivalent number of common units of BPLP. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT.

The Company believes that combining the Annual Reports on Form 10-K of BXP and BPLP into this single report:

•enhances investors’ understanding of BXP and BPLP by enabling them to view the business as a whole in the same manner as management views and operates the business;

•eliminates duplicative disclosure and provides a more concise and readable presentation because a substantial portion of the disclosure applies to both BXP and BPLP; and

•creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.

The Company believes it is important to understand the few differences between BXP and BPLP in the context of how BXP and BPLP operate as a consolidated company. The financial results of BPLP are consolidated into the financial statements of BXP. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving the securities of BXP. BPLP holds substantially all of the assets of BXP, including ownership interests in subsidiaries and joint ventures. BPLP conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for the net proceeds from equity issuances by BXP, which are contributed to the capital of BPLP in exchange for common or preferred units of partnership in BPLP, as applicable, BPLP generates all remaining capital required by the Company’s business. These sources include working capital, net cash provided by operating activities, borrowings under its credit facilities, the issuance of secured and unsecured debt and equity securities and proceeds received from the disposition of certain properties and interests in joint ventures.

Shareholders’ equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of BXP and BPLP. The limited partners of BPLP are accounted for as partners’ capital in BPLP’s financial statements and as noncontrolling interests in BXP’s financial statements. The noncontrolling interests in BPLP’s financial statements include the interests of unaffiliated partners in various consolidated partnerships. The noncontrolling interests in BXP’s financial statements include the same

noncontrolling interests in BPLP and limited partners of BPLP. The differences between shareholders’ equity and partners’ capital result from differences in the equity issued by each of BXP and BPLP.

In addition, the consolidated financial statements of BXP and BPLP differ in total real estate assets resulting from previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor redemptions of common units of BPLP. This accounting resulted in a step-up of the real estate assets of BXP at the time of such redemptions, resulting in a difference between the net real estate of BXP as compared to BPLP of approximately $249.9 million, or 1.3% at December 31, 2022, and a corresponding difference in depreciation expense, impairment losses and gains on sales of real estate upon the sale of these properties having an allocation of the real estate step-up. The acquisition accounting was nullified on a prospective basis beginning in 2009 as a result of the Company’s adoption of a new accounting standard requiring any subsequent redemptions to be accounted for solely as an equity transaction.

To help investors better understand the key differences between BXP and BPLP, the following items in this report present information separately for BXP and BPLP:

•Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities;

•Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and Liquidity and Capital Resources, includes information specific to each entity, where applicable;

•Item 8. Financial Statements and Supplementary Data which includes the following specific disclosures for BXP and BPLP:

• Note 2. Summary of Significant Accounting Policies;

• Note 3. Real Estate;

• Note 10. Stockholders’ Equity / Partners’ Capital;

• Note 11. Segment Information; and

• Note 12. Earnings Per Share / Common Unit;

• Item 15. Financial Statement Schedule—Schedule 3.

This report also includes separate Part II, Item 9A. Controls and Procedures, as well as separate Exhibit 23 consents of the independent registered public accounting firm and Exhibits 31 and 32 certifications for each of BXP and BPLP.

TABLE OF CONTENTS 

ITEM NO.	DESCRIPTION	PAGE NO.
PART I		3
1.	BUSINESS	3
1A.	RISK FACTORS	27
1B.	UNRESOLVED STAFF COMMENTS	48
2.	PROPERTIES	48
3.	LEGAL PROCEEDINGS	54
4.	MINE SAFETY DISCLOSURES	54
PART II		55
5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	55
6.	RESERVED	57
7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	58
7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	104
8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA	105
9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	179
9A.	CONTROLS AND PROCEDURES	179
9B.	OTHER INFORMATION	179
9C.	DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS	179
PART III		180
10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	180
11.	EXECUTIVE COMPENSATION	180
12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	180
13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	181
14.	PRINCIPAL ACCOUNTANT FEES AND SERVICES	181
PART IV		182
15.	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES	182
16.	FORM 10-K SUMMARY	196

Summary of Risk Factors

The risk factors detailed in Item 1A titled “Risk Factors” in this Annual Report on Form 10-K are the risks that we believe are material to our investors and a reader should carefully consider them. Those risks are not all of the risks we face and other factors not presently known to us or that we currently believe are immaterial may also affect our business if they occur. The following is a summary of the risk factors detailed in Item 1A:

•Our performance depends upon the economic conditions, particularly the supply and demand characteristics, of our markets—Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC.

•Enhanced market and economic volatility due to adverse economic and geopolitical conditions, health crises or dislocations in the credit markets could have a material adverse effect on our results of operations, financial condition and ability to pay dividends and/or distributions.

•The outbreak of highly infectious or contagious diseases, such as COVID-19, could adversely impact or cause disruption to our financial condition, results of operations, cash flows and liquidity and those of our clients.

•Our success depends on key personnel whose continued service is not guaranteed.

•Our performance and value are subject to risks associated with our real estate assets and with the real estate industry, including, without limitation:

◦potential difficulties or delays renewing leases or re-leasing space;

◦potential adverse effects from major clients’ bankruptcies or insolvencies;

◦potential sustained changes in client preferences and space utilization from full-time, collective in-person work environments to hybrid or remote work models, which could decrease overall demand for workplaces and cause market rental rates and property values to be negatively impacted;

◦potential delays in completion of development and redevelopment projects due to supply chain disruptions and labor shortages; and

◦potential increases in costs to maintain, renovate and develop our properties related to inflation.

•Our actual costs to develop properties may exceed our budgeted costs.

•Our use of joint ventures and participation in the Strategic Capital Program (“SCP”) may limit our control over and flexibility with jointly owned investments and other assets we may wish to acquire.

•We face risks associated with the use of debt to fund acquisitions and developments, including refinancing risk.

•Increases in interest rates would increase our interest costs on variable rate debt and could adversely impact our ability to re-finance existing debt or sell assets on favorable terms or at all.

•Covenants in our debt agreements could adversely affect our financial condition.

•Our degree of leverage could limit our ability to obtain additional financing or affect the market price of our equity and debt securities.

•We face risks associated with climate change and severe weather events, as well as the regulatory efforts intended to reduce the effects of climate change.

•Potential liability for environmental contamination could result in substantial costs.

•Some potential losses are not covered by insurance.

•We face risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems.

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•Our involvement in legal proceedings and other claims may result in substantial monetary and other costs that have a material adverse effect on our results of operations.

•We face risks associated with BXP’s status as a real estate investment trust (REIT), including, without limitation:

◦failure to qualify as a REIT would cause BXP to be taxed as a corporation, which would substantially reduce funds available for payment of dividends;

◦possible adverse state and local tax audits and changes in state and local tax laws could result in increased tax costs that could adversely affect our financial condition and results of operations and the amount of cash available for the payment of dividends and distributions to our securityholders; and

◦in order to maintain BXP’s REIT status, we may be forced to borrow funds during unfavorable market conditions.

•Changes in accounting pronouncements could adversely affect our operating results, in addition to the reported financial performance of our clients.

This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 58.

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PART I

Item 1. Business

General

BXP, a Delaware corporation, is a fully integrated, self-administered and self-managed REIT, and is one of the largest publicly-traded office REITs (based on total market capitalization as of December 31, 2022) in the United States that develops, owns and manages primarily premier workplaces. BXP was formed in 1997 to succeed the real estate development, redevelopment, acquisition, management, operating and leasing businesses associated with the predecessor company founded by Mortimer B. Zuckerman and Edward H. Linde in 1970.

Our properties are concentrated in six dynamic gateway markets—Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. At December 31, 2022, we owned or had joint venture interests in a portfolio of 194 commercial real estate properties, aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.2 million net rentable square feet. As of December 31, 2022, our properties consisted of: 

•173 office and life sciences properties (including 10 properties under construction/redevelopment);

•14 retail properties (including two properties under construction/redevelopment);

•six residential properties (including one property under construction); and

•one hotel.

We consider premier workplaces to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and are professionally managed and maintained. As such, these properties attract creditworthy clients and command upper-tier rental rates. Our definition of premier workplaces may be different than those used by other companies.

We are a full-service real estate company, with substantial in-house expertise and resources in acquisitions, development, financing, capital markets, construction management, property management, marketing, leasing, accounting, risk management, tax and legal services. For this reason, we refer to our tenants as “clients” due to the many facets of our continuous engagements with them, which span beyond the usual tenant/landlord relationship. Throughout this Annual Report, we use the terms “tenant” and “client” interchangeably.

BXP manages BPLP as its sole general partner. Our principal executive office and Boston regional office are located at The Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199 and our telephone number is (617) 236-3300. In addition, we have regional offices at 2800 28th Street, Suite 170, Santa Monica, California 90405, 599 Lexington Avenue, New York, New York 10022, Four Embarcadero Center, San Francisco, California 94111, 1001 Fourth Avenue, Seattle, Washington 98154 and 2200 Pennsylvania Avenue NW, Washington, DC 20037.

Our internet address is http://www.bxp.com. On our website, you can obtain free copies of our Annual Reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, including exhibits, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission, or the SEC. You may also obtain BXP’s and BPLP’s reports by accessing the EDGAR database at the SEC’s website at http://www.sec.gov, or we will furnish an electronic or paper copy of these reports free of charge upon written request to: Investor Relations, Boston Properties, Inc., Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199. “Boston Properties” is a registered trademark, BXP is a registered trademark, and the “bxp” logo is a registered trademark, in both cases, owned by BPLP.

Boston Properties Limited Partnership

BPLP is a Delaware limited partnership organized in 1997, and the entity through which BXP conducts substantially all of its business and owns, either directly or through subsidiaries, substantially all of its assets. BXP is the sole general partner of BPLP and, as of February 21, 2023, the owner of approximately 89.4% of the economic interests in BPLP. Economic interest was calculated as the number of common partnership units of BPLP owned by BXP as a percentage of the sum of (1) the actual aggregate number of outstanding common partnership units of BPLP and (2) the number of common units issuable upon conversion of all outstanding long term incentive plan units of BPLP (“LTIP Units”), for which all performance conditions have been satisfied for such conversion. We exclude from (1) and (2) above other LTIP Units issued in the form of Multi-Year Long-Term Incentive Plan Awards in

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2021 or later (“MYLTIP Awards”), which remain subject to performance conditions. An LTIP Unit is generally the economic equivalent of a share of BXP’s restricted common stock, although LTIP Units issued in the form of MYLTIP Awards are only entitled to receive one-tenth (1/10th) of the regular quarterly distributions (and no special distributions) prior to being earned.

Transactions During 2022

Acquisitions

On May 17, 2022, we completed the acquisition of Madison Centre in Seattle, Washington for a net purchase price, including transaction costs, of approximately $724.3 million. The acquisition was completed using the proceeds from BPLP’s $730.0 million unsecured term loan (See Note 7 to the Consolidated Financial Statements). Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace.

On September 16, 2022, we acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property.

Dispositions

For information explaining why BXP and BPLP may report different gains on sales of real estate, see the Explanatory Note that follows the cover page of this Annual Report on Form 10-K.

On March 31, 2022, we completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property.

On April 19, 2021, we entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, we executed an agreement to assign our right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and are reflected as Other income - assignment fee in our Consolidated Statements of Operations. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

On June 15, 2022, we completed the sale of our suburban Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet.

On August 30, 2022, we completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace.

On September 15, 2022, we completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

On November 8, 2022, we completed the sale of the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141.0 million. Net cash proceeds totaled approximately $139.6 million, resulting in a gain on sale of real estate of approximately $55.6 million for BXP and BPLP. The Avant at Reston Town Center is a 15-story, 359-unit, luxury multifamily building consisting of approximately 329,000 net rentable square feet, excluding retail space. We retained ownership of the approximately 26,000 square foot ground-level retail space.

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Developments/Redevelopments

As of December 31, 2022, we had 13 properties under construction/redevelopment, which we expect will total approximately 3.2 million net rentable square feet. We estimate our share of the total investment to complete these projects, in the aggregate, is approximately $1.9 billion, of which approximately $729.1 million remains to be invested as of December 31, 2022. The total development pipeline, inclusive of both office and laboratory/life sciences developments, but excluding View Boston at The Prudential Center and Reston Next Residential, is 37% pre-leased as of February 21, 2023. For a detailed list of the properties under construction/redevelopment see “Liquidity and Capital Resources” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

On April 27, 2022, we entered into a 15-year lease agreement with AstraZeneca for approximately 566,000 net rentable square feet at our 290 Binney Street future development project. 290 Binney Street is part of the initial phase of a future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. The full project is expected to consist of two buildings aggregating approximately 1.1 million rentable square feet of life sciences space and an approximately 400,000 square foot residential building (See Note 16 to the Consolidated Financial Statements).

On April 29, 2022, we partially placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC.

On May 13, 2022, we commenced the development of Reston Next Office Phase II, a premier workplace project located in Reston, Virginia. When completed, the building will consist of approximately 90,000 net rentable square feet.

On June 29, 2022, we completed and fully placed in-service 325 Main Street, a premier workplace project with approximately 414,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2022, we commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet.

On September 8, 2022, we terminated our existing lease agreement with our client at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space (See Note 16 to the Consolidated Financial Statements).

On September 12, 2022, we commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet.

On October 19, 2022, we completed and fully placed in-service Reston Next, a premier workplace project consisting of two buildings with an aggregate of approximately 1.1 million net rentable square feet, located in Reston, Virginia.

On November 30, 2022, we commenced the redevelopment of 105 Carnegie Center, located in Princeton, New Jersey. The redevelopment is a repositioning of the property. 105 Carnegie Center consisted of approximately 70,000 net rentable square feet of office space. When completed, the building will consist of approximately 73,000 net rentable square feet of laboratory/life sciences space.

On December 1, 2022, we removed 2096 Gaither Road from our in-service portfolio following the expiration of the last leases on November 30, 2022. 2096 Gaither Road consisted of approximately 50,000 net rentable square feet of office space in our Shady Grove Innovation District, located in Rockville, Maryland. We anticipate we will redevelop or convert 2096 Gaither Road to support lab or life sciences-related uses.

On December 23, 2022, we completed and fully placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts.

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Ground Lease

On July 29, 2020, we entered into a 99-year ground lease with a third-party hotel developer for land at our Reston Next property located in Reston Virginia, which will support the development of a 267-room, approximately 241,000 square foot hotel property. The lease commenced on October 21, 2020 and was subject to termination rights, which we were not reasonably certain would not be exercised. As such, we accounted for the ground lease as an operating lease. On December 19, 2022, we amended the ground lease which included the elimination of the termination rights. As a result, this lease was reclassified as a sales-type lease. We recorded a sales-type lease receivable of approximately $13.0 million, which includes an unguaranteed residual asset of approximately $17,000. In addition, we recorded a gain on sales-type lease of approximately $10.1 million associated with the derecognition of the asset. We did not recognize any interest income during the year ended December 31, 2022.

Unsecured Debt

On May 17, 2022, BPLP entered into an unsecured credit agreement (the “2022 Unsecured Term Loan”) providing for a single borrowing of up to $730.0 million. The 2022 Unsecured Term Loan matures on May 16, 2023.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the 2022 Unsecured Term Loan (See Notes 3 and 7 to the Consolidated Financial Statements). As of December 31, 2022, the 2022 Unsecured Term Loan bears interest at a variable rate equal to term the Secured Overnight Financing Rate (“SOFR”) plus 0.95% per annum based on BPLP’s credit rating at December 31, 2022. At December 31, 2022, BPLP had $730.0 million outstanding under the 2022 Unsecured Term Loan (See Note 16 to the Consolidated Financial Statements).

On November 17, 2022, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.750% unsecured senior notes due 2027. The notes were priced at 99.941% of the principal amount to yield an effective rate (including financing fees) of approximately 6.924% per annum to maturity. The notes will mature on December 1, 2027, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $743.5 million after deducting underwriting discounts and transaction expenses.

Equity Transactions

During the year ended December 31, 2022, BXP acquired an aggregate of 182,929 common units of limited partnership interest, including 78,249 common units issued upon the conversion of LTIP Units, 2012 outperformance plan awards (“2012 OPP Units”) and 2013 - 2022 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), presented by the holders for redemption, in exchange for an equal number of shares of BXP common stock.

Investments in Unconsolidated Joint Ventures

On January 18, 2022, a joint venture in which we own a 50% interest commenced the redevelopment of 651 Gateway located in South San Francisco, California. 651 Gateway is a premier workplace that is being converted to approximately 327,000 net rentable square feet of life sciences space.

On February 2, 2022, a joint venture in which we own a 55% interest commenced the development of the first phase of Platform 16, a premier workplace project located in San Jose, California, that is expected to contain approximately 1.1 million net rentable square feet upon completion. The first phase of the development projects includes the construction of an approximately 390,000 net rentable square foot premier workplace building and a below-grade parking garage.

On March 28, 2022, a joint venture in which we own a 20% interest refinanced with a new lender the debt secured by its Metropolitan Square property located in Washington, DC. At the time of the refinancing, the loan had an outstanding balance of approximately $294.1 million, bore interest at a variable rate equal to (1) the greater of (x) London Interbank Offered Rate (“LIBOR”) or (y) 0.65%, plus (2) 4.75% per annum and was scheduled to mature on July 7, 2022, with two, one-year extension options, subject to certain conditions. There was no prepayment penalty associated with the prepayment of the previous mortgage loan. The joint venture recognized a loss from early extinguishment of debt totaling approximately $1.3 million due to the write-off of unamortized deferred financing costs. In conjunction with the refinancing, the joint venture settled its interest rate cap agreement, entered into in 2020, to limit its exposure to increases in the LIBOR rate. The new mortgage and mezzanine loans have an aggregate principal balance of $420.0 million, bear interest at a weighted average variable rate equal to SOFR plus 2.75% per annum and mature on April 9, 2024, with three, one-year extension options, subject to certain conditions.

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The joint venture distributed excess loan proceeds from the new mortgage and mezzanine loans totaling approximately $100.5 million, of which our share totaled approximately $20.1 million. On September 1, 2022, the joint venture entered into an interest rate cap agreement that capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

On April 18, 2022, a joint venture in which we own a 50% interest extended the maturity date of the construction loan collateralized by its Hub50House property to June 19, 2022. At the time of the extension, the loan had an outstanding balance of approximately $176.5 million, bore interest at a variable rate equal to LIBOR plus 2.00% per annum and was scheduled to mature on April 19, 2022. On June 17, 2022, the joint venture repaid the existing construction loan and obtained a new mortgage loan. The new mortgage loan has a principal balance of $185.0 million, bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. At closing, the joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts. In conjunction with the new mortgage loan, the joint venture paid off the existing construction loan. At the time of the payoff of the construction loan, the outstanding balance of the loan totaled approximately $176.7 million. The joint venture distributed excess loan proceeds from the new mortgage loan totaling approximately $6.8 million, of which our share totaled approximately $3.4 million. Hub50House is a residential property that consists of approximately 320,000 net rentable square feet and 440 residential units located in Boston, Massachusetts.

On May 13, 2022, we entered into a joint venture with a third party to own, operate and develop Reston Next Residential located in Reston, Virginia. Reston Next Residential is expected to consist of 508 residential rental units upon completion. We contributed approximately $11.3 million of improvements at closing and will contribute cash totaling approximately $3.5 million post-closing for our 20% ownership interest in the joint venture. The partner contributed approximately $0.5 million of cash at closing and will contribute cash totaling approximately $58.7 million in the future for its 80% ownership interest in the joint venture. As a result of the partner’s deferred contribution, as of the acquisition date, we owned an approximately 96% interest in the joint venture. On May 13, 2022, the joint venture commenced development and entered into a construction loan collateralized by the property. The construction loan has a principal amount of up to $140.0 million, bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

On June 16, 2022, we entered into a joint venture with a third party to own, operate and develop 751 Gateway, a laboratory building located in South San Francisco, California, that is expected to be approximately 231,000 net rentable square feet upon completion. 751 Gateway was previously part of our Gateway Commons joint venture. We contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $2.6 million for our 49% ownership interest in the joint venture. The partner contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $4.9 million for its 51% ownership interest in the joint venture.

On August 8, 2022, a joint venture in which we own a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bore interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, had a total commitment amount of approximately $198.4 million, and continued to mature on December 18, 2023. On December 22, 2022, the joint venture further modified the construction loan. The further modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 2.50% per annum, has a total commitment amount of approximately $198.4 million, and matures on December 18, 2025. During December 2022, we recognized a non-cash impairment charge totaling approximately $50.7 million, which represented the other-than temporary decline in the fair value below the carrying value of our investment in the unconsolidated joint venture that owns Dock 72. We assessed the impairment and concluded that it was other than temporary. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

On September 9, 2022, a joint venture in which we own an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan had an outstanding balance of approximately $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR

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plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

On November 17, 2022, we acquired a 26.69% interest in the joint venture that owns 200 Fifth Avenue located in New York, New York, for a gross purchase price of approximately $280.2 million, which included $120.1 million of cash and our pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum and matures on November 24, 2028. The joint venture has interest rate swap contracts with notional amounts aggregating $600.0 million through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts. 200 Fifth Avenue is a 14-story, approximately 855,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket.

On December 7, 2022, a joint venture in which we own a 50% interest modified the mortgage loan collateralized by its Market Square North property located in Washington, DC. At the time of the modification the loan had an outstanding balance of approximately $125.0 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.50%, plus (2) 2.30% per annum, and was scheduled to mature on November 10, 2025, with one, one-year extension option, subject to certain conditions. The modified mortgage loan bears interest at a variable rate equal to the greater of (1) the sum of (x) the “benchmark rate”, (y) 2.30% and (z) the adjustment applicable to such “benchmark rate” (approximately 0.11% for Term SOFR), or (2) 2.80%. For the period December 7, 2022 through March 9, 2023, the “benchmark rate” means LIBOR, and for the period after March 10, 2023, through the maturity date, Term SOFR. The modified mortgage loan continues to mature on November 10, 2025, with a one-year extension option, subject to certain conditions. Market Square North is a premier workplace with approximately 418,000 net rentable square feet located in Washington, DC.

On December 23, 2022, a joint venture in which we own a 50% interest modified the construction loan collateralized by its The Hub on Causeway – Podium property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $174.3 million, bore interest at a variable rate equal to LIBOR plus 2.25% per annum, and was scheduled to mature on September 6, 2023. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 2.25% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan bears interest at a variable rate equal to Term SOFR plus 2.35% per annum. The modified construction loan continues to mature on September 6, 2023. The Hub on Causeway – Podium is a premier workplace with approximately 380,000 net rentable square feet located in Boston, Massachusetts.

On December 23, 2022, a joint venture in which we own a 50% interest modified the construction loan collateralized by its 100 Causeway Street property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $337.6 million, bore interest at a variable rate equal to LIBOR plus 1.50% per annum, and was scheduled to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 1.50% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan will bear interest at a variable rate equal to Term SOFR plus 1.60% per annum. The modified construction loan continues to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. 100 Causeway Street is a premier workplace with approximately 630,000 net rentable square feet located in Boston, Massachusetts.

Stock Option and Incentive Plan

On February 1, 2022, BXP’s Compensation Committee approved a new equity-based, multi-year, long-term incentive program (the “2022 MYLTIP”) as a performance-based component of our overall compensation program. Under the Financial Accounting Standards Board’s Accounting Standards Codification (“ASC”) 718 “Compensation - Stock Compensation,” the 2022 MYLTIP has an aggregate value of approximately $17.3 million, which amount will generally be amortized into earnings under the graded vesting method (See Note 14 to the Consolidated Financial Statements).

On February 4, 2022, the measurement period for our 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

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Business and Growth Strategies

Business Strategies

Our primary business objective is to maximize return on investment to provide our investors with the greatest possible total return in all points of the economic cycle. Our strategies to achieve this objective are:

•to target a few carefully selected dynamic gateway markets—Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC—and to be one of the leading, if not the leading, developers, owners and managers in each of those markets with a full-service office in each market providing property management, leasing, development, construction and legal expertise. We select markets and submarkets with a diverse economic base and a deep pool of prospective clients in various industries and where clients have demonstrated a preference for premier workplaces and other facilities. Additionally, our markets have historically been able to recruit new talent to them and as such created job growth that results in growth in rental rates and occupancy over time. We have explored, and may continue to explore for future investment, select domestic and international markets that exhibit these same traits;

•to emphasize markets and submarkets within those markets where the difficulty of receiving the necessary approvals for development and the necessary financing constitute high barriers to the creation of new supply, and where skill, financial strength and diligence are required to successfully develop, finance and manage high-quality office and life sciences space, as well as selected retail and residential space;

•to take on complex, technically challenging development projects, leveraging the skills of our management team to successfully develop, acquire or reposition properties that other organizations may not have the capacity or resources to pursue;

•to own and develop high-quality real estate designed to meet the demands of today’s clients who require sophisticated telecommunications and related infrastructure, support services, sustainable features and amenities, including those amenities that enrich in-person experiences and support a hybrid work environment, and to manage those facilities so as to become the landlord of choice for both existing and prospective clients;

•to opportunistically acquire assets that increase our market share in the markets in which we have chosen to concentrate, as well as potential new markets, which exhibit an opportunity to improve returns through repositioning (through a combination of capital improvements and shift in marketing strategy), changes in management focus and leasing;

•to explore joint venture opportunities with (1) existing property owners located in desirable locations, who seek to benefit from the depth of development and management expertise we are able to provide and our access to capital and (2) expand our SCP, leveraging our skills as developers, owners and managers of premier workplaces and mixed-use complexes;

•to pursue on a selective basis the sale of properties or interests therein, including core properties, to either (1) take advantage of the demand for our premier properties and realize the value we have created or (2) pare from our portfolio properties that we believe have slower future growth potential;

•to seek third-party development contracts to enable us to retain and utilize our existing development and construction management staff, especially when our internal development is less active or when new development is less-warranted due to market conditions; and

•to enhance our capital structure through our access to a variety of sources of capital and proactively manage our debt expirations.

Growth Strategies

External Growth Strategies

We believe that our development experience, our organizational depth, utilization of our SCP and our balance sheet position us to continue to selectively develop a range of premier workplaces, including high-rise urban developments, mixed-use developments (including office, residential and retail), low-rise suburban office properties and life sciences space, within budget and on schedule. We believe we are also well-positioned to achieve external growth through acquisitions. Other factors that contribute to our competitive position include:

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•our control of sites (including sites under contract or option to acquire) in our markets that could support approximately 16.9 million additional square feet of new development (see Note 16 to the Consolidated Financial Statements);

•our reputation gained through 53 years of successful operations and the stability and strength of our existing portfolio of properties;

•our relationships with leading national corporations, universities and public institutions, including government agencies, seeking new facilities and development services;

•our relationships with nationally recognized financial institutions that provide capital to the real estate industry;

•our track record and reputation for executing acquisitions efficiently provide comfort to domestic and foreign institutions, private investors and corporations who seek to sell commercial real estate in our market areas;

•our ability to act quickly on due diligence and financing;

•our relationships with institutional buyers and sellers of high-quality real estate assets;

•our ability to procure entitlements from multiple municipalities to develop sites and attract land owners to sell or partner with us; and

•our relationship with domestic and foreign investors, including SCP partners, who seek to partner with companies like ours.

Opportunities to execute our external growth strategy fall into three categories:

•Development in selected submarkets. We believe the selected development of well-positioned premier workplaces, including office, life sciences, residential buildings and mixed-use complexes may be justified in our markets. We believe in acquiring land after taking into consideration timing factors relating to economic cycles and in response to market conditions that allow for its development at the appropriate time. While we purposely concentrate in markets with high barriers-to-entry, we have demonstrated throughout our 53-year history, an ability to make carefully timed land acquisitions in submarkets where we can become one of the market leaders in establishing rent and other business terms. We believe that there are opportunities at key locations in our existing and other markets for a well-capitalized developer to acquire land with development potential.

In the past, we have been particularly successful at acquiring sites or options to purchase sites that need governmental approvals for development. Because of our development expertise, knowledge of the governmental approval process and reputation for quality development with local government regulatory bodies, we generally have been able to secure the permits necessary to allow development and to profit from the resulting increase in land value. We seek complex projects where we can add value through the efforts of our experienced and skilled management team leading to attractive returns on investment.

Our strong regional relationships and recognized development expertise have enabled us to capitalize on unique build-to-suit opportunities. We intend to seek and expect to continue to be presented with such opportunities in the near term allowing us to earn relatively significant returns on these development opportunities through multiple business cycles.

•Acquisition of assets and portfolios of assets from institutions or individuals. We believe that due to our size, management strength and reputation, we are well positioned to acquire portfolios of assets or individual properties from institutions or individuals if valuations meet our criteria. In addition, we believe that our market knowledge and our liquidity and access to capital may provide us with a competitive advantage when pursuing acquisitions. Opportunities to acquire properties may also come through the purchase of first mortgage or mezzanine debt. We are also able to appeal to sellers wishing to contribute on a tax-deferred basis their ownership of property for equity in a diversified real estate operating company that offers liquidity through access to the public equity markets in addition to a quarterly distribution. Our ability to offer common and preferred units of limited partnership in BPLP to sellers who would otherwise recognize a taxable gain upon a sale of assets for cash or BXP’s common stock may facilitate these types

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of acquisitions on a tax-efficient basis. Existing promulgated Treasury regulations may limit the tax benefits previously available to sellers in some variations of these transactions.

•Acquisition of underperforming assets and portfolios of assets. We believe that because of our in-depth market knowledge and development experience in each of our markets, our national reputation with brokers, financial institutions, owners of real estate and others involved in the real estate market and our access to competitively-priced capital, we are well-positioned to identify and acquire existing, underperforming properties for competitive prices and to add significant additional value to such properties through our effective marketing strategies, repositioning/redevelopment expertise and a responsive property management program.

Internal Growth Strategies

We believe that opportunities will exist to increase cash flow from our existing properties through an increase in occupancy and rental rates because they are of high quality and in desirable locations. Additionally, our markets have diversified economies that have historically experienced job growth and increased use of office space, resulting in growth in rental rates and occupancy over time. Our strategy for maximizing the benefits from these opportunities is three-fold: (1) to provide high-quality property management services using our employees in order to encourage clients to renew, expand and relocate in our properties, (2) to achieve speed and transaction cost efficiency in replacing departing clients through the use of in-house services for marketing, lease negotiation and construction of tenant and capital improvements and (3) to work with new or existing clients with space expansion or contraction needs, leveraging our expertise and clustering of assets to maximize the cash flow from our assets. We expect to continue our internal growth as a result of our ability to:

•Cultivate existing submarkets and long-term relationships with credit clients. In choosing locations for our properties, we have paid particular attention to transportation and commuting patterns, physical environment, adjacency to established business centers and amenities, proximity to sources of business growth and other local factors.

The weighted-average lease term of our in-place leases based on square feet, including leases signed by our unconsolidated joint ventures, was approximately 7.9 years at December 31, 2022, and we continue to cultivate long-term leasing relationships with a diverse base of high-quality, financially stable clients. Based on leases in place at December 31, 2022, leases with respect to approximately 5.1% of the total square feet in our portfolio, including unconsolidated joint ventures, will expire in calendar year 2023. 

•Directly manage our office properties to maximize the potential for client retention. We provide property management services ourselves, rather than contracting for this service, to maintain awareness of and responsiveness to client needs. We and our properties also benefit from cost efficiencies produced by an experienced work force attentive to preventive maintenance and energy management and from our continuing programs to assure that our property management personnel at all levels remain aware of their important role in client relations. In addition, we reinvest in our properties by adding new services and amenities that are desirable to our clients.

•Replace clients quickly at best available market terms and lowest possible transaction costs. We believe that we are well-positioned to attract new clients and achieve relatively high rental and occupancy rates as a result of our well-located, well-designed and well-maintained properties, our reputation for high-quality building services and responsiveness to clients, and our ability to offer expansion and relocation alternatives within our submarkets.

•Extend terms of existing leases to existing clients prior to expiration. We have also successfully structured early client renewals, which have reduced the cost associated with lease downtime while securing the tenancy of our highest quality credit-worthy clients on a long-term basis and enhancing relationships.

•Re-development of existing assets. We believe the select re-development of assets within our portfolio, where through the ability to increase the building size and/or to increase cash flow and generate appropriate returns on incremental investment after consideration of the asset’s current and future cash flows, may be desirable. This generally occurs in situations in which we are able to increase the building’s size, improve building systems, including conversion to higher yielding life sciences uses, and sustainability features, and/or add client amenities, thereby increasing client demand, generating acceptable returns on incremental investment and enhancing the long-term value of the property and the company. In the past, we have been particularly successful at gaining local government approval for

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increased density at several of our assets, providing the opportunity to enhance value at a particular location. Our strong regional relationships and recognized re-development expertise have enabled us to capitalize on unique build-to-suit opportunities. We intend to seek and expect to continue to be presented with such opportunities in the near term allowing us to earn attractive returns on these development opportunities through multiple business cycles.

Environmental, Social and Governance (ESG)

Our Strategy

We actively work to promote our growth and operations in a sustainable and responsible manner across our six regions. The BXP ESG strategy is to conduct our business, the development, ownership and operation of new and existing buildings, in a manner that contributes to positive economic, social and environmental outcomes for our clients, shareholders, employees and the communities we serve. Our investment philosophy is shaped by our core strategy of long-term ownership and our commitment to our communities and the centers of commerce and civic life that make them thrive. We are focused on developing and maintaining healthy, high-performance buildings, while simultaneously mitigating operational costs and the potential external impacts of energy, water, waste, greenhouse gas (“GHG”) emissions and climate change. Positive social impact is also of great importance to BXP and our employees, which is exhibited by our commitments to charitable giving, volunteerism, public realm investments and promoting diversity, equity and inclusion in the workplace and our communities. Through these efforts, we demonstrate that operating and developing commercial real estate can be conducted with a conscious regard for the environment and broader society while mutually benefiting our stakeholders.

ESG Leadership

We continue to address the needs of our stakeholders by making efforts to maintain and improve our ESG performance across three pillars: climate action, climate resilience and social good. BXP is a widely recognized industry leader in ESG. 2022 ESG highlights include:

•BXP ranked among the top real estate companies in the GRESB assessment, earning a seventh consecutive 5-Star rating. 2022 was the eleventh consecutive year that BXP earned the GRESB “Green Star” designation

•BXP’s MSCI rating improved from an A to AA, and CDP score improved from C to B

•BXP was named to Newsweek’s List of America’s Most Responsible Companies in 2023 for the third consecutive year. BXP ranked first in the Real Estate & Housing industry with an increased ranking of 29th overall out of the 500 companies and received the third highest environmental score

•BXP was named to the Dow Jones Sustainability Index (DJSI) North America for the second consecutive year. BXP was one of eight real estate companies that qualified and the only office REIT in the index, scoring in the 95th percentile of the real estate companies assessed for inclusion

•BXP was recognized by Commercial Property Executive for having the “Best ESG Program”

•BXP was the recipient of Nareit’s prestigious Leader in the Light Award

•BXP was named an ENERGY STAR Partner of the Year – Sustained Excellence Award Winner

•BXP was recognized as an inaugural Platinum Level Green Lease Leader by the Institute for Market Transformation and the U.S. Department of Energy

Our leadership position is due, in part, to our establishment of environmental goals, the periodic reporting of progress towards our goals and the achievement of these goals. We have publicly adopted energy, emissions, water and waste goals that establish reduction targets aligned with the United Nations Sustainable Development Goals. As of the end of 2021, the combined impacts of efficiency measures, renewable energy and reduced physical occupancy due to the COVID-19 pandemic resulted in a 41% decrease in energy use intensity and over 70% reduction in Scope 1 and Scope 2 GHG emissions intensity below a 2008 base year. We have also aligned our emissions reduction targets with climate science and in 2020 became the first North American office REIT to establish an emissions reduction target ambition in line with a 1.5°C trajectory, the most ambitious designation available at the time of submission under the Science Based Targets initiative. In April 2021, we affirmed our commitment to achieving carbon-neutral operations (for direct and indirect Scope 1 and Scope 2 GHG emissions) by 2025 from our occupied and actively managed buildings where we have operational control.

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We are focused on developing, owning and operating healthy and high-performance buildings. BXP is a corporate member of the U.S. Green Building Council® (“USGBC”) and has a long history of green buildings under USGBC’s Leadership in Energy and Environmental Design™ (LEED®) rating system. As of December 31, 2022, we have LEED-certified 33.5 million square feet of our total in-service portfolio, of which 94% is certified at the highest Gold and Platinum levels. In 2018, we announced a partnership with a leading healthy building certification system, Fitwel, to support healthy building design and operational practices across our portfolio, becoming a Fitwel Champion. We completed our Fitwel Champion commitments and have added 23.8 million square feet of Fitwel certified buildings across our total in-service portfolio since 2018. In response to the COVID-19 pandemic, we completed the Fitwel Viral Response Module Enterprise and Asset-level Certification at all actively managed buildings.

Sustainability Accounting Standards Board (“SASB”) Disclosures

The Real Estate Sustainability Accounting Standard issued by SASB in 2018 proposed sustainability accounting metrics designed for disclosure in mandatory filings, such as the Annual Report on Form 10-K, and serves as the framework against which we have aligned our disclosures for sustainability information. The recommended energy and water management activity metrics for the real estate industry include energy consumption data coverage as a percentage of floor area (“Energy Intensity”); percentage of the eligible portfolio that is certified ENERGY STAR® (“ENERGY STAR certified”); total energy consumed by portfolio area (“Total Energy Consumption”); water withdrawal as a percentage of total floor area (“Water Intensity”); and total water withdrawn by portfolio area (“Total Water Consumption”). Our energy and water data is collected from utility bills and submeters and is assured by an independent, third party assurance expert, which includes all SASB 2021 energy and water metrics. For more information on the independent, third-party assurance expert and the methodology used to assure the data, refer to “Reporting” below. During the 2021 calendar year, 46 buildings representing 43% of our eligible portfolio were ENERGY STAR certified. A licensed professional has verified all ENERGY STAR applications.

The charts below detail our Energy Intensity, Total Energy Consumption, Water Intensity and Total Water Consumption for 2015 through 2021 for which data were available on occupied and actively managed buildings where we had operational control.1,2,3,4,5,6

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(1)Full 2022 calendar year energy and water data will not be available and assured by a third party until March 31, 2023. Therefore, 2021 is the most recent year for which complete and third-party assured energy and water data is available.

(2)The charts reflect the performance of our occupied and actively managed portfolio in Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. We define “occupied buildings” as those with no more than 50% vacancy. Actively managed buildings are those where we have operational control of building system performance and investment decisions. At the end of the 2021 calendar year, our occupied and actively managed portfolio included 116 buildings totaling 44.8 million gross square feet, which accounted for approximately 85% of BXP’s total in-service portfolio by area.

(3)Floor area is considered to have complete energy consumption data coverage when we obtain energy consumption data (i.e., energy types and amounts consumed) for all types of energy consumed in the relevant floor area during the calendar year, regardless of when such data was obtained.

(4)The scope of energy includes energy purchased from sources external to us and our clients or produced by us or our clients and energy from all sources, including fuel, gas, electricity and steam. Energy use intensity (kBtu/SF) has been weather normalized.

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(5)Water sources include surface water (including water from wetlands, rivers, lakes and oceans), groundwater, rainwater collected directly and stored by BXP, municipal water supplies or supply from other water utilities.

(6)2020 and 2021 data reflect the combined impacts of efficiency measures, renewable energy and reduced physical occupancy due to the COVID-19 pandemic.

Climate Resilience

As a long-term owner and active manager of real estate assets in operation and under development, we take a long-term view on climate change risks and opportunities. We are focused on understanding how climate change may impact the performance of our portfolio and the steps we can take to increase climate resilience. We continue to evaluate the potential risks associated with climate change that could impact our portfolio and are taking proactive steps to plan for and/or mitigate such risks.

Ø    Governance

As a vertically integrated, full-service real estate company, we are engaged in addressing climate-related issues at all levels of our organization. Management’s role in overseeing, assessing and managing climate-related risks, opportunities and initiatives is spread across multiple teams throughout our organization, including our Board of Directors, executive leadership and our Sustainability, Risk Management, Development, Construction and Property Management Departments. BXP has a dedicated team of sustainability professionals focused on ESG issues that coordinate and collaborate across corporate and regional teams to advance environmental sustainability issues and initiatives. Our Board of Directors has established a board-level Sustainability Committee to, among other things, increase Board oversight over environmental and sustainability issues, including climate-related risks and opportunities. The Board delegated to the Sustainability Committee its responsibility to oversee BXP’s sustainability program, which includes monitoring and addressing, as needed, environmental-, sustainability- and climate-related risks.

Our approach to climate-related issues is also informed by robust stakeholder engagement. We are in frequent dialogue with investors, customers, community members, governmental policymakers, consultants and other non-governmental organizations. We are heavily involved in industry associations and participate in conferences and workshops covering ESG, sustainability and climate resilience topics. Through these engagements, we enhance our knowledge of climate-related issues and those issues that are most important to our stakeholders and industry best practices.

Ø Strategy

We have aligned our climate-related disclosures with the recommendations of the Task Force on Climate-Related Financial Disclosures (“TCFD”). The TCFD framework has informed the development of our strategy for identifying and managing both physical and transition risks associated with climate change. As defined by the TCFD framework, physical risks associated with climate change include acute risks (extreme weather-related events) and chronic risks (such as extreme heat and sea-level rise), and transition risks associated with climate change include policy and legal risks, and other technology, market and reputation-related risks.

We continue to proactively assess the potential risks that may impact the properties in our portfolio, gather information and monitor the evolving regulatory landscape related to climate change. Our process for assessing climate-related risks and their implications on our properties and business includes a climate change scenario analyses that was conducted in 2021 on our portfolio assets. In particular, we engaged Moody’s ESG Solutions (formerly branded as Four Twenty Seven Application), an independent provider of science-driven insights and analytics on climate risk, for its climate risk scoring to evaluate the forward-looking physical climate risk exposure of our entire portfolio. The scenario analysis and physical risk scoring was based on an RCP 8.5 emissions scenario, which is a worst-case, high emissions scenario, under a time horizon up to 2040. The scenario analysis included all in-service assets owned by BXP and included climate events such as hurricane, wildfire, heat, water stress, flooding and sea-level rise. We are also using Moody’s ESG Solutions data to identify potential risks during the new acquisition diligence process. The analysis of our portfolio yielded no material findings.

We consider climate-related risks and opportunities in the context of the following time horizons: short-term (1-2 years), medium-term (3-10 years) and long-term (>10 years). Based on the foregoing process for evaluating climate-related risks, including the scenario analysis, we have identified (1) the following potential physical and transition risks associated with climate change that could impact our portfolio in the future across the stated time horizons and (2) our climate-related opportunities. We will continue to analyze the results of the Moody’s ESG Solutions analysis and the following risks and opportunities to understand our potential

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exposure and inform our climate resilience strategy and future investments, which include climate-related risk mitigation and initiatives.

Time Period	Physical Risks
Short- to Medium-Term	Increased severity of extreme weather events, including flooding and wind damage, extreme heat and sea-level rise may cause one or more of the following to occur: •Direct damage to properties •Increased costs of property insurance •Supply chain disruption •Costs associated with capital expenditures and infrastructure-related remediation projects •Alteration of designs at new and existing buildings •Increased costs of real estate taxes or other assessments
Long-Term	Building adaptation, including architectural and mechanical improvements, could increase capital expenditure requirements. Extreme drought and wildfires could adversely impact demand in markets prone to water scarcity and annual wildfire risk. Sea-level rise and extreme weather events could make property insurance unavailable in high-risk areas. Public transportation system disruptions could impact access to BXP buildings. Chronic climate-related physical risks and associated downtime could result in declining demand for office space at impacted buildings.
Time Period	Transition Risks
Short- to Medium-Term	Non-compliance with regulatory requirements, including energy and carbon performance standards, may increase costs and/or introduce potential fines. Compliance with green building codes, including electrification of heating systems, may increase development and operational costs. Failure to meet sustainability needs (e.g., net-zero requirements) of clients and investors could result in lost business. Additional growth, particularly in life sciences, may increase energy and emissions intensities.
Long-Term	Real estate taxes may increase to fund public projects to improve regional and neighborhood-scale resilience.
Time Period	Mitigation & Other Opportunities
Short-Term	Energy and carbon reductions could result in greater product differentiation and competitive advantage. Stronger ESG disclosures, particularly regarding climate action and resilience, may qualify BXP for greater inclusion in ESG ETFs and other funds. BXP may benefit from a lower cost of capital from green bonds and/or sustainability-linked credit. BXP may avoid operating cost increases from rising energy costs through actions focused on efficient operations.
Medium-Term	BXP may avoid penalties associated with building energy and carbon performance standards. Assets may be converted and/or certified net-zero, which may increase demand for office space.
Long-Term	By focusing on the risks of climate change associated with acute and chronic physical risks during the development, acquisition and operating life of assets, BXP may mitigate losses and downtime resulting from extreme weather events.

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Ø    Risk Management

BXP is committed to managing and avoiding the impacts of climate change. Our risk management program includes physical and transition risks, including both climate mitigation (resource efficiency and emissions reduction) and adaptation (integration of climate resilience into our investment decision-making). We are actively acquiring, developing and operating a geographically diverse portfolio of high-quality commercial real estate properties. Individual assets have unique risk profiles and insurance requirements. Through the processes of acquisition, development and operation of our in-service portfolio, our experienced real estate professionals are identifying risks, including business continuity risks, loss exposure related to extreme weather events and impacts of regulation, including permitting requirements, codes, and energy and carbon performance standards. The climate risk profile of each individual property is largely dependent on the property’s unique attributes, physical location and jurisdictional regulatory requirements.

Asset-Level Risk Management

We carry all-risk property insurance on our properties including those under development. Insurance coverage mitigates the impact to BXP from losses associated with natural catastrophes, such as floods, fires, earthquakes and wind events.

We are preparing for long-term climate risk by considering climate change scenarios and expect that we will continue to assess climate change vulnerabilities resulting from potential future climate scenarios and sea-level rise. We will continue to evaluate existing plans and procedures and proactively implement practical, cost-effective resiliency measures and infrastructure enhancements, including:

•Business Continuity Plans

•Emergency Response and Life Safety Plans

•Emergency Evacuation Planning, Procedures and Drills

•Client Engagement and Coordination

•Life Safety Analysis

•Elevation of vault, switchgear and critical equipment during new development

•Waterproofing of subgrade infrastructure

•Floodable first floors

•Temporary flood barriers

•Backup generation, emergency lighting and fire pumps

•Onsite energy resources and distributed generation, storage and solar photovoltaic systems.

We are managing transition risks by benchmarking energy, carbon, water and waste performance at the asset level and are prioritizing interventions at underperforming assets. We develop, operate and maintain a large portfolio of buildings that are LEED, ENERGY STAR and/or Fitwel certified. As of December 31, 2022, 85% of our actively managed portfolio was certified under one or more of these frameworks. As a leader in green building, we will continue to make investments in building performance, energy efficiency and decarbonization.

Through our climate action efforts, we believe we can play a leading role in advancing the transition to a low-carbon economy and are taking action to decarbonize operations. GHG sources include the generated electricity and steam at offsite generation facilities, the onsite combustion of fuels (e.g., natural gas), and emissions associated with other business activities, including business travel and new development. We continue to explore and implement creative and cost-effective measures that reduce GHG emissions from our operations.

BXP became a proud signatory of the We Are Still In pledge after the U.S. withdrawal from the Paris Agreement and has aligned emissions reduction targets with climate science. The SBTi Target Validation Team has classified BXP’s emissions reduction target ambition and has determined that it is in line with a 1.5°C trajectory, the most ambitious designation available at the time of submission. We are committed to achieving carbon-neutral operations, or net-zero carbon dioxide equivalent emissions, which includes direct and indirect Scope 1 and Scope 2 GHG emission, by 2025 from our occupied and actively managed buildings where we have operational control.

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BXP’s Carbon-Neutral Operations Strategy

Our strategy to achieve carbon-neutral operations includes the following goals:

(1)Energy Efficient Operations – Approximately 1/3 of total carbon reductions by 2025 (below a 2008 base year) from energy conservation and efficient operations.

(2)Renewable Energy – Advancement of onsite development of renewable energy systems and sourcing offsite renewable energy to meet 100% of our electricity needs by 2025.

(3)Electrification – Explore and advance electrification, prioritizing electrification of new developments and replacement of onsite gas-fired systems at existing buildings at the end of their useful lives.

(4)Carbon Offsets – To the extent necessary, offset any remaining emissions during the transition to carbon-free energy.

The resilience of our markets may depend on the action taken by cities to adapt transportation, energy, and communication infrastructure for extreme heat, weather events, sea-level rise and flooding. We will continue to encourage the adaptation of our cities and management of physical and transition risks by maintaining a voice in policy decision-making at the local level through direct engagement and/or advocacy through collective membership-based groups.

Ø Metrics

We closely monitor energy consumption and associated GHG emissions and provide detailed accounting of ESG key performance indicators in our annual ESG reporting. As of the end of 2021, the combined impacts of efficiency measures, renewable energy and reduced physical occupancy due to the COVID-19 pandemic resulted in a 41% decrease in energy use intensity and an over 70% reduction in Scope 1 and Scope 2 GHG emissions intensity below a 2008 base year. BXP’s carbon-neutral commitment includes direct and indirect Scope 1 and Scope 2 emissions from our actively managed portfolio where we have operational control. Scope 1 and Scope 2 emissions include emissions associated with total landlord-controlled energy use. Scope 1 emissions include all emissions associated with the onsite combustion of fossil fuels for heating, hot water and standby generators. Scope 2 emissions include all emissions associated with the offsite generation of electricity and steam. As our business continues to grow, carbon reduction targets and the transparent disclosure of ESG metrics will remain a priority.

Reporting

A notable part of our commitment to sustainable development and operations is our commitment to transparent reporting of ESG performance indicators, as we recognize the importance of this information to investors, lenders and others in understanding how BXP assesses sustainability information and evaluates risks and opportunities. We publish an annual ESG report that is aligned with the Global Reporting Initiative (GRI) Framework, United Nations Sustainable Development Goals and the SASB Framework. BXP’s ESG Report includes our strategy, key performance indicators, annual like-for-like comparisons, and achievements. The report is available on our website at http://www.bxp.com under the heading “Commitment.” Our annual ESG reports, including all of our energy, water and emissions metrics included therein, are assured by an independent, third-party assurance expert. The assurance expert performs an independent verification for certain of our ESG performance indicators and issues an opinion, which is attached to each ESG report, that opines on each ESG report’s inclusiveness, materiality, sustainability context, completeness, and reliability.

We have been an active participant in the green bond market since 2018, which provides access to sustainability-focused investors interested in the positive environmental externalities of our business activities. Since 2018, BPLP has issued an aggregate of $4.3 billion of green bonds in five separate offerings. The terms of the green bonds have restrictions that limit our allocation of the net proceeds to “eligible green projects.” We publish Green Bond Allocation Reports disclosing the full or partial allocation, as applicable, of net proceeds from the green bond offerings to eligible green projects. We have published four Green Bond Allocation Reports that fully allocate more than $3.5 billion in net proceeds to eligible green projects. The Green Bond Allocation Reports are available on our website at http://www.bxp.com under the heading “Commitment.” We expect to publish a Green Bond Allocation Report to allocate net proceeds from our most recent November 2022 green bond offering in the fourth quarter of 2023.

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Except for the documents specifically incorporated by reference into this Annual Report on Form 10-K, the information contained on our website or that can be accessed through our website is not incorporated by reference into this Annual Report on Form 10-K.

Human Capital Management

Our culture supports and nurtures our employees. Our employees are a significant distinguishing factor that sets BXP apart. As of December 31, 2022, we had 675 non-union employees (we had 780 employees, inclusive of union employees). All data provided in this Human Capital Management section refers to BXP’s non-union employee workforce as the unions control primary aspects of the hiring process. Our operational and financial performance depends on their talents, energy, experience and well-being. Our ability to attract and retain talented people depends on a number of factors, including work environment, career development and professional training, compensation and benefits, and the health, safety and wellness of our employees. We have an established reputation for excellence and integrity and these core values are inherent in our culture and play a critical role in achieving our goals and overall success.

Diversity, Equity & Inclusion

We strive to create a diverse and inclusive workplace. It has been, and will continue to be, our policy to recruit, hire, assign, promote and train in all job titles without regard to race, national origin, religion, age, color, sex, sexual orientation, gender identity, disability, protected veteran status, or any other characteristic protected by local, state, or federal laws, rules, or regulations. By implementing this policy, we aim to ensure that all employees have the opportunity to make their maximum contribution to us and to their own career goals.

BXP’s Diversity, Equity & Inclusion Council (the “DEI Council”) is an executive-sponsored, voluntary and employee-led committee unified by BXP’s mission to promote diversity, equity, inclusion and transparency as part of our organization’s culture, decision-making practices and business activities, while also providing a mechanism for positive impact in the communities in which we operate. Since its formation in 2020, the DEI Council has grown to over 33 Council members across our six regions, and each member contributes to the overall mission through leadership in one or more of the DEI Council’s three committees – the Recruiting & Development Committee, the Company Policies Committee and the Community Outreach Committee – and/or three employee resource groups (“ERGs”). Including ERG members, as of December 31, 2022, BXP’s DEI community consisted of 244 members, or 36% of BXP’s workforce.

The DEI Council in collaboration with BXP’s CEO, President and Human Resources Department annually identify actionable diversity goals and proposes initiatives to advance its mission. In 2022, the DEI Council’s focus areas were: (1) training and workforce education, (2) recruiting and onboarding, (3) employee engagement, (4) social responsibility, (5) transparency and communication and (6) governance. BXP’s notable achievements for 2022 include:

•Training & Workforce Education

◦Conducted a two-part training for DEI Council members to enhance DEI leadership skills

◦Continued cultural awareness education for the BXP workforce through interactive DEI event offerings, consistent communications with educational content regarding cultural holidays and awareness months and collaboration with property management teams to enhance visibility of important DEI dates and celebrations across BXP’s properties

•Recruiting & Onboarding

◦57% women and 39% ethnically diverse new hires in 2022

◦4.5% increase in ethnically diverse employees and 6.5% increase in ethnically diverse officers compared to the 2020 base year

◦2.0% increase in women employees and 9.0% increase in women officers compared to the 2020 base year

◦Launched partnerships with CareerSpring and Project Destined to further enhance BXP’s community involvement, BXP employees’ volunteerism, as well as expand BXP’s diverse candidate pools to include program alumni and young professionals

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◦Contracted with recruiting firms with intentionality to include women- and/or minority-owned businesses or businesses with DEI programs, which represented, as of December 2022, approximately 50% of BXP’s contracted recruiting firms

•Employee Engagement

◦Launched three ERGs designed to connect employees who have similar backgrounds and shared experiences with the goal of working with BXP on diversity, equity and inclusion, bringing people together to share experiences and best practices, and ensuring that we are supporting each other across our communities

◦Participation rate across BXP for the ERGs’ inaugural year totaled approximately 25% of all employees

•Social Responsibility

◦Continued to facilitate relationships with minority-owned businesses to provide commercial real estate space

◦Conducted a comprehensive review of vendors identified as underrepresented business enterprises (“UBEs”) with the aim of increasing UBE usage by BXP resulting in a 34% year-over-year increase in UBE usage compared to 2021

◦Commenced a new depository relationship with a Black-owned bank and continued our partnership with a minority- and women-owned bank in our 2022 unsecured notes offering

◦Increased community involvement through, among other efforts, regional charitable contributions to DEI-associated initiatives in our regions

•Transparency & Communication

◦Dedicated a company-wide Town Hall discussion to BXP’s DEI initiatives, achievements and future programming led by the DEI Council’s co-chairs

◦Launched DEI Council page on BXP’s internal portal that provides DEI resources and announces future events, initiatives and other information

•Governance

◦Formalized charters and mission statements for the DEI Council and each ERG

◦Undertook a voluntary refreshment process of DEI Council members to ensure appropriate representation across backgrounds, experience and regions that resulted in a 55% increase in DEI Council membership since its formation

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Diversity, Equity & Inclusion at BXP(1)

TOTAL WORKFORCE(2)(3) MANAGER & ABOVE(2)(3) BOARD OF DIRECTORS

 _______________

(1) As of December 31, 2022. We determine race and gender based on our employees' and directors’ self-identification.

(2) Represents percentages for all of our employees excluding union employees for which the unions control primary aspects of the hiring process; percentages do not include BXP’s non-employee directors.

(3) “Other” represents American Indian/Alaskan Native, Native Hawaiian or Other Pacific Islander, two or more races and those that did not self-identify.

Culture & Employee Engagement

We believe that the success of our business is tied to the quality of our workforce, and we strive to maintain a corporate environment without losing the entrepreneurial spirit with which we were founded more than 50 years ago. By providing a quality workplace and comprehensive benefit programs, we recognize the commitment of our employees to bring their talent, energy, and experience to us. Our continued success is attributable to our employees’ expertise and dedication.

We periodically conduct employee engagement surveys to monitor our employees’ satisfaction in different aspects of their employment, including company performance, leadership, communication, career development and benefits offerings. Past employee responsiveness to the engagement surveys has been consistently high and the results help inform us on matters that our employees view as key contributors to a positive work experience. Based on the most recent employee engagement survey conducted in 2022, with 96% responsiveness, the overall company-wide result was a “favorable” rating. The highest scoring statement on the survey with a 94% favorability score was “BXP conducts its business in accordance with the highest standards and ethical conduct.” We intend to continue to periodically evaluate employee engagement as needed on a meaningful basis.

Another indicator of the success of our efforts in the workplace is the long tenure of our employees, 35% of whom have worked at BXP for ten or more years. The average tenure of our employees is approximately 9.42 years and that of our officers is 17.65 years. In 2022, our voluntary workforce turnover rate was 15%.

Career Development & Training

We invest significant resources in our employees’ personal and professional growth and development and provide a wide range of tools and development opportunities that build and strengthen employees’ leadership and

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professional skills. These development opportunities include in-person and virtual training sessions, in-house learning opportunities, various management trainings, departmental conferences, executive townhalls and external programs. We foster an environment of growth and internal promotion and strive for a best-in-class candidate experience for our internal applicants. Open positions are posted, and employees are highly encouraged to apply for promotion within the organization. For 2022, 16% of our employees were promoted to elevated roles within our organization. Of the employees promoted, 50% were women and 29% were non-White.

Compensation & Benefits

We designed our compensation program with the goal of providing a balanced and effective way of ensuring internal equity and market competitiveness in our pay practices. We have coupled external, market-driven data with an equitable performance review assessment tool to strike the balance that best represents our compensation strategy and links pay to performance. On an annual basis, our Human Resources department evaluates market compensation ranges for each position to ensure we are appropriately compensating our top performers. We believe this total rewards program directly aligns with our compensation and benefits strategy.

Our employee benefit programs are designed to meet the needs of our diverse workforce, support our employees and their families by offering comprehensive and competitive programs that provide flexibility and choice in coverage, make available valuable resources to protect and enhance financial security and help balance work and personal life. Some of the benefits that we offer our employees include:

•health (including telehealth), dental and vision insurance,

•a 401(k) plan with a generous matching contribution,

•an employee stock purchase plan,

•health care and dependent care flexible spending accounts,

•income protection through our sick pay, salary continuation and long-term disability policies and life insurance,

•a scholarship program for the children of non-officer employees,

•a commuter subsidy to support the use of public transportation,

•tuition reimbursement,

•paid vacation, holiday, personal and volunteer days and paid parental leave to balance work and personal life,

•back-up child and elder care, and

•pet insurance.

Health, Safety & Wellness

As one of the largest publicly traded premier workplace REITs (based on total market capitalization as of December 31, 2022) in the United States, we are keenly aware of the influence of buildings on human health and its importance to our clients and employees. The health, safety and security of our employees, clients, contractors and others are our highest priority. In early 2020, we convened a Health Security Task Force and developed the BXP Health Security Plan, a comprehensive set of building operational measures, to address health and safety measures in our buildings during the COVID-19 pandemic. Some components of the Health Security Plan remained applicable and in place in 2022: we continued to focus on our indoor air quality initiative and installed new indoor air quality monitoring devices across approximately 40 buildings in 2022 that provide real-time indoor air quality data, maintained enhanced air filtration in buildings and continued to conduct air and water quality testing.

We believe the success of our employees is dependent upon their overall well-being, including their physical health, mental health, work-life balance and financial well-being. In addition to the benefits outlined above, we also offer our employees an Employee Wellness Program, an Employee Assistance Program and a Mental Health Well-Being Program. The Employee Wellness Program was established in 2016 to encourage employees to improve their health and well-being by offering a variety of activities and engaging content to meet individual wellness goals. Program participants receive a reduction in their health insurance deduction cost. The Employee Assistance Program includes services for childcare, eldercare, personal relationship information, financial planning assistance, stress management, mental illness and general wellness and self-help. BXP offers a premium mental health program that provides online resources and support for employees facing a wide variety of issues.

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Policies with Respect to Certain Activities

The discussion below sets forth certain additional information regarding our investment, financing and other policies. These policies have been determined by BXP’s Board of Directors and, in general, may be amended or revised from time to time by the Board of Directors.

Investment Policies

Investments in Real Estate or Interests in Real Estate

Our investment objectives are to provide quarterly cash dividends/distributions to our securityholders and to achieve long-term capital appreciation through increases in our value. We have not established a specific policy regarding the relative priority of these investment objectives.

We expect to continue to pursue our investment objectives primarily through the ownership of our current properties, development and redevelopment projects and other acquired properties. We currently intend to continue to invest primarily in developments of properties and acquisitions of existing improved properties or properties in need of redevelopment, and acquisitions of land that we believe have development potential, primarily in our existing markets of Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. We have explored and may continue to explore for future investment in select domestic and international markets that exhibit these same traits. Future investment or development activities will not be limited to a specified percentage of our assets. We intend to engage in such future investment or development activities in a manner that is consistent with the maintenance of BXP’s status as a REIT for federal income tax purposes. In addition, we may purchase or lease income-producing commercial and other types of properties for long-term investment, expand and improve the real estate presently owned or other properties purchased, or sell such real estate properties, in whole or in part, when circumstances warrant. We do not have a policy that restricts the amount or percentage of assets that will be invested in any specific property, however, our investments may be restricted by our debt covenants.

We may also continue to participate with third parties in property ownership, through joint ventures or other types of co-ownership. These investments may permit us to own interests in larger assets without unduly restricting diversification and, therefore, add flexibility in structuring our portfolio.

Equity investments may be subject to existing mortgage financing and other indebtedness or such financing or indebtedness as may be incurred in connection with acquiring or refinancing these investments. Debt service on such financing or indebtedness will have a priority over any distributions with respect to BXP’s common stock. Investments are also subject to our policy not to be treated as an investment company under the Investment Company Act of 1940, as amended (the “1940 Act”). 

Investments in Real Estate Mortgages

While our current portfolio consists primarily of, and our business objectives emphasize, equity investments in commercial real estate, we may, at the discretion of the Board of Directors of BXP, invest in mortgages and other types of real estate interests consistent with BXP’s qualification as a REIT. Investments in real estate mortgages run the risk that one or more borrowers may default under such mortgages and that the collateral securing such mortgages may not be sufficient to enable us to recoup our full investment. We may invest in participating, convertible or traditional mortgages if we conclude that we may benefit from the cash flow, or any appreciation in value of the property or as an entrance to the fee ownership. As of December 31, 2022, we had one note receivable outstanding, which was approximately $78.6 million.

Securities of or Interests in Entities Primarily Engaged in Real Estate Activities

Subject to the percentage of ownership limitations and gross income and asset tests necessary for BXP’s REIT qualification, we also may invest in securities of other REITs, other entities engaged in real estate activities or securities of other issuers, including for the purpose of exercising control over such entities.

Dispositions

We decide to dispose or partially dispose of properties based upon the periodic review of our portfolio and the determination by the Board of Directors of BXP that doing so is in our best interests. Any decision to dispose of a property will be authorized by the Board of Directors of BXP or a committee thereof. Some holders of limited partnership interests in BPLP could incur adverse tax consequences upon the sale of certain of our properties that differ from the tax consequences to BXP. Consequently, holders of limited partnership interests in BPLP may have

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different objectives regarding the appropriate pricing and timing of any such sale. Such different tax treatment derives in most cases from the fact that we acquired these properties in exchange for partnership interests in contribution transactions structured to allow the prior owners to defer taxable gain. Generally, this deferral continues so long as we do not dispose of the properties in a taxable transaction. Unless a sale by us of these properties is structured as a like-kind exchange under Section 1031 of the Internal Revenue Code of 1986, as amended (the “Code”), or in a manner that otherwise allows deferral to continue, recognition of the deferred tax gain allocable to these prior owners is generally triggered by a sale. As of December 31, 2022, we had one property that was subject to a tax protection agreement, which may limit our ability to dispose of the asset or require us to pay damages to the prior owner in the event of a taxable sale in violation of the agreement. The tax protection agreement expires on December 14, 2033, or earlier if certain conditions by the prior owner are met.

Financing Policies 

The agreement of limited partnership of BPLP and BXP’s certificate of incorporation and bylaws do not limit the amount or percentage of indebtedness that we may incur. Further, we do not have a policy limiting the amount of indebtedness that we may incur, nor have we established any limit on the number or amount of mortgages that may be placed on any single property or on our portfolio as a whole. However, our mortgages, credit facilities, joint venture agreements and unsecured debt securities contain customary restrictions, requirements and other limitations on our ability to incur indebtedness. In addition, we evaluate the impact of incremental leverage on our debt metrics and the credit ratings of BPLP’s publicly traded debt. A reduction in BPLP’s credit ratings could result in us borrowing money at higher interest rates.

The Board of Directors of BXP will consider a number of factors when evaluating our level of indebtedness and when making decisions regarding the incurrence of indebtedness, including the purchase price of properties to be acquired with debt financing, the estimated market value of our properties upon refinancing, the entering into agreements such as interest rate swaps, caps, floors and other interest rate hedging contracts and the ability of particular properties and us as a whole to generate cash flow to cover expected debt service. 

Policies with Respect to Other Activities

As the sole general partner of BPLP, BXP has the authority to issue additional common and preferred units of limited partnership interest of BPLP. BXP has issued, and may in the future issue, common or preferred units of limited partnership interest to persons who contribute their direct or indirect interests in properties to us in exchange for such common or preferred units. We have not engaged in trading, underwriting or agency distribution or sale of securities of issuers other than BXP and BPLP does not intend to do so. At all times, we intend to make investments in such a manner as to enable BXP to maintain its qualification as a REIT, unless, due to changes in circumstances or to the Code, the Board of Directors of BXP determines that it is no longer in the best interest of BXP to qualify as a REIT. We may make loans to third parties, including, without limitation, to joint ventures in which we participate or in connection with the disposition of a property. We intend to make investments in such a way that we will not be treated as an investment company under the 1940 Act. Our policies with respect to these and other activities may be reviewed and modified or amended from time to time by the Board of Directors of BXP. 

Governmental Regulations

General

Compliance with various governmental regulations has an impact on our business, including our capital expenditures, earnings and competitive position, which can be material. We incur costs to monitor and take actions to comply with governmental regulations that are applicable to our business, which include, among others, (1) federal securities laws and regulations, (2) applicable stock exchange requirements, and (3) federal, state and local laws and regulations related to (a) our status as a REIT and other tax laws and regulations, and (b) real property, the improvements thereon and the operation thereof, such as laws and regulations relating to the environment, health and safety, zoning, usage, building, fire and life safety codes, (4) the requirements of the Office of Foreign Assets Control of the United States Department of the Treasury and (5) the Americans with Disabilities Act of 1990. In addition to the discussion below, see “Item 1A – Risk Factors” for a discussion of these governmental regulations and other material risks to us, including, to the extent material, to our competitive position, and see “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” together with our consolidated financial statements, including the related notes included therein, for a discussion of material information relevant to an assessment of our financial condition and results of operations, including, to the extent material, the effects that compliance with governmental regulations may have upon our capital expenditures and earnings.

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Environmental Matters

It is our policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with our acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that we believe will have a material adverse effect on our business, assets, financial condition, results of operations or liquidity, and we are not otherwise aware of environmental conditions with respect to our properties that we believe would have such a material adverse effect. However, from time to time environmental conditions at our properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action. 

For example, in February 1999, we (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. We developed an office park on the property. We engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to our ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify us for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses and contractual limitations, including time limits, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges. 

Environmental investigations at some of our properties and certain properties owned by our affiliates have identified groundwater contamination migrating from off-site source properties. In each case we engaged a licensed environmental consultant to perform the necessary investigations and assessments, and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. We also believe that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although we believe that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, we will take such further response actions (if any) that we deem necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time. 

Some of our properties and certain properties owned by our affiliates are located in urban, industrial and other previously developed areas where fill or current or historical use of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations, it is our practice to investigate the nature and extent of detected contamination, including potential issues associated with vapor intrusion concerns and/or potential contaminant migration to or from the subject property in ground water, assess potential liability risks and estimate the costs of required response actions and special handling procedures. We then use this information as part of our decision-making process with respect to the acquisition, deal structure and/or development of the property. For example, we own a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. We have developed an office park on this property. Prior to and during redevelopment activities, we engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws. 

We expect that resolution of the environmental matters described above will not have a material impact on our business, assets, financial condition, results of operations or liquidity. However, we cannot assure you that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties, that we will be indemnified, in full or at all, or that we will have insurance coverage in the event that such environmental liabilities arise. 

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Corporate Governance

BXP is currently governed by an eleven-member Board of Directors. The current members of the Board of Directors of BXP are Kelly A. Ayotte, Bruce W. Duncan, Carol B. Einiger, Diane J. Hoskins, Mary E. Kipp, Joel I. Klein, Douglas T. Linde, Matthew J. Lustig, Owen D. Thomas, David A. Twardock and William H. Walton III. All directors of BXP stand for election for one-year terms expiring at the next succeeding annual meeting of stockholders.

Owen D. Thomas currently serves as the Chairman of BXP’s Board of Directors and Kelly A. Ayotte serves as our Lead Independent Director. The Board of Directors of BXP also has Audit, Compensation, Nominating and Corporate Governance and Sustainability Committees. The membership of each of these committees is described below.

Audit

Compensation

Nominating and Corporate Governance

Sustainability

Kelly A. Ayotte*

Bruce W. Duncan

X

X

Carol B. Einiger

X

X

Diane J. Hoskins

X

X

(1)

Mary E. Kipp

X

X

Joel I. Klein

X

(1)

X

Douglas T. Linde

X

Matthew J. Lustig

X

(1)

X

Owen D. Thomas (2)

X

David A. Twardock

X

(1)

X

William H. Walton III

X

*=Lead Independent Director, X=Committee member, (1)=Committee Chair, (2)=Chairman of BXP’s Board of Directors

BXP has the following corporate governance documents and procedures in place:

•The Board of Directors has adopted charters for each of its Audit, Compensation and Nominating and Corporate Governance Committees. A copy of each of these charters is available on our website at http://www.bxp.com under the heading “Investors” and subheading “Governance.”

•The Board of Directors has adopted Corporate Governance Guidelines, a copy of which is available on our website at http://www.bxp.com under the heading “Investors” and subheading “Governance” with the name “Governance Guidelines.”

•The Board of Directors has adopted a Code of Business Conduct and Ethics, which governs business decisions made and actions taken by BXP’s directors, officers and employees. A copy of this code is available on our website at http://www.bxp.com under the heading “Investors” and subheading “Governance” with the name “Code of Business Conduct and Ethics.” BXP intends to disclose on this website any amendment to, or waiver of, any provisions of this Code applicable to the directors and executive officers of BXP that would otherwise be required to be disclosed under the rules of the SEC or the New York Stock Exchange.

•The Board of Directors has established an ethics reporting system that employees may use to anonymously report possible violations of the Code of Business Conduct and Ethics, including concerns regarding questionable accounting, internal accounting controls or auditing matters, by telephone or over the internet.

•The Board of Directors has adopted a Policy on our Political Spending, a copy of which is available on our website at http://www.bxp.com under the heading “Investors” and the subheading “Governance” with the name “Policy on Political Spending.”

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Competition

We compete in the leasing of premier workplace, retail and residential space with a considerable number of other real estate companies, some of which may have greater marketing and financial resources than are available to us. In addition, our hotel property competes for guests with other hotels, some of which may have greater marketing and financial resources than are available to us and to the manager of our one hotel, Marriott International, Inc. 

Principal factors of competition in our primary business of owning, acquiring and developing premier workplaces are the quality of properties, leasing terms (including rent and other charges and allowances for tenant improvements), attractiveness and convenience of location, the quality and breadth of client services and amenities provided, and reputation as an owner and operator of premier workplaces in the relevant market. Additionally, our ability to compete depends upon, among other factors, trends in the national and local economies, investment alternatives, financial condition and operating results of current and prospective clients, availability and cost of capital, construction and renovation costs, taxes, utilities, governmental regulations, legislation and population trends. 

In addition, we currently have six residential properties (including one under construction) and may in the future decide to acquire or develop additional residential properties. As an owner, we will also face competition for prospective residents from other operators/owners whose properties may be perceived to offer a better location or better amenities or whose rent may be perceived as a better value given the quality, location and amenities that the resident seeks. We will also compete against condominiums and single-family homes that are for sale or rent. Because the scale of our residential portfolio is relatively small, we expect to continue to retain third parties to manage our residential properties.

Our Hotel Property

We operate our hotel property through a taxable REIT subsidiary. The taxable REIT subsidiary, a wholly-owned subsidiary of BPLP, is the lessee pursuant to a lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. The hotel lease is intended to provide the economic benefits of ownership of the underlying real estate to flow to us as rental income, while our taxable REIT subsidiary earns the profit or loss from operating the property as a hotel. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreements. Marriott has been engaged under a separate long-term incentive management agreement to operate and manage the hotel on behalf of the taxable REIT subsidiary.

Supplemental United States Federal Income Tax Considerations

The following discussion supplements and updates the disclosures under “United States Federal Income Tax Considerations” in the prospectus dated May 22, 2020 contained in our Registration Statement on Form S-3 filed with the SEC on May 22, 2020 (such disclosure, the “Base Disclosure”). Capitalized terms herein that are not otherwise defined shall have the same meaning as when used in the Base Disclosure.

On December 29, 2022, the IRS promulgated final Treasury Regulations under Sections 897, 1441, 1445, and 1446 of the Code that were, in part, intended to coordinate various withholding regimes for non-U.S. stockholders. The new Treasury Regulations provide guidance regarding qualified foreign pension funds and are largely consistent with the previously issued proposed Treasury Regulations.

Accordingly, the third and fourth sentences of the third paragraph under the heading “United States Federal Income Tax Considerations—Taxation of Stockholders and Potential Tax Consequences of Their Investment in Shares of Common Stock or Preferred Stock—Taxation of Non-U.S. Stockholders—Dispositions of Stock” are hereby deleted and replaced with the following:

Under Treasury Regulations, subject to the discussion below regarding “qualified holders,” a “qualified controlled entity” also is not generally treated as a non-U.S. stockholder for purposes of FIRPTA. A qualified controlled entity generally includes a trust or corporation organized under the laws of a foreign country all of the interests of which are held by one or more qualified foreign pension funds either directly or indirectly through one or more qualified controlled entities.

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Additionally, the following two paragraphs are added after the third paragraph under the heading “United States Federal Income Tax Considerations—Taxation of Stockholders and Potential Tax Consequences of Their Investment in Shares of Common Stock or Preferred Stock—Taxation of Non-U.S. Stockholders—Dispositions of Stock”:

Treasury Regulations further require that a qualified foreign pension fund or qualified controlled entity will not be exempt from FIRPTA with respect to dispositions of USRPIs or REIT distributions attributable to the same unless the qualified foreign pension fund or qualified controlled entity is a “qualified holder.” To be a qualified holder, a qualified foreign pension fund or qualified controlled entity must satisfy one of two alternative tests at the time of the disposition of the USRPI or the REIT distribution. Under the first test, a qualified foreign pension fund or qualified controlled entity is a qualified holder if it owned no USRPIs as of the earliest date during an uninterrupted period ending on the date of the disposition or distribution during which it qualified as a qualified foreign pension fund or qualified controlled entity. Alternatively, if a qualified foreign pension fund or qualified controlled entity held USRPIs as of the earliest date during the period described in the preceding sentence, it can be a qualified holder only if it satisfies certain testing period requirements.

Treasury Regulations also provide that a foreign partnership, all of the interests of which are held by qualified holders, including through one or more partnerships, may certify its status as such and will not be treated as a non-U.S. stockholder for purposes of withholding under FIRPTA.

Item 1A. Risk Factors.

Set forth below are the risks that we believe are material to our investors and they should be carefully considered. Throughout this section, we refer to the equity and debt securities of both BXP and BPLP as our “securities,” and the investors who own securities of BXP, BPLP or both, as our “securityholders.” These risks are not all of the risks we face and other factors not presently known to us or that we currently believe are immaterial may also affect our business if they occur. This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 58.

Risks Related to Our Business and Operations

Our performance depends upon the economic conditions, particularly the supply and demand characteristics, of our markets—Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC.

Substantially all of our revenue is derived from properties located in six markets: Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. A downturn in the economies of these markets, or the impact that a downturn in the overall national economy may have upon these economies, could result in reduced demand for office space and/or a reduction in rents. Because our portfolio consists primarily of premier workplace buildings (as compared to a more diversified real estate portfolio), a decrease in demand for workplaces in turn could adversely affect our results of operations. Additionally, there are submarkets within our markets that are dependent upon a limited number of industries. For example, in our Washington, DC market, we focus on leasing our properties to governmental agencies and contractors, as well as legal firms. A reduction in spending by the Federal Government could result in reduced demand for office space and adversely affect our results of operations. In addition, in our New York market, we have historically leased properties to financial, legal and other professional firms. A significant downturn in one or more of these sectors could adversely affect our results of operations. 

In addition, a significant economic downturn over a period of time could result in an event or change in circumstances that results in an “other than temporary” impairment in the value of our properties or our investments in unconsolidated joint ventures. An “other than temporary” impairment loss is recognized if the carrying amount of the asset (1) is not recoverable over its expected holding period and (2) exceeds its fair value. There can be no assurance that we will not take charges in the future related to the impairment of our assets or investments. Any future impairment could have a material adverse effect on our results of operations in the period in which the charge is taken.

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Enhanced market and economic volatility due to adverse economic and geopolitical conditions, health crises or dislocations in the credit markets could have a material adverse effect on our results of operations, financial condition and ability to pay dividends and/or distributions. 

Our business may be adversely affected by market and economic volatility experienced by the U.S. and global economies, the real estate industry as a whole and/or the local economic conditions in the markets in which our properties are located. Such adverse economic and geopolitical conditions may be due to, among other issues, prolonged labor market challenges impacting the recruitment and retention of talent, continued inflation, high interest rates, and volatility in the public equity and debt markets, and international economic and other conditions, including pandemics, geopolitical instability and other conditions beyond our control. These current conditions, or similar conditions existing in the future, may adversely affect our results of operations, financial condition and ability to pay dividends and/or distributions as a result of the following, among other potential consequences: 

•the financial condition of our clients may be adversely affected, which may result in client defaults under leases due to bankruptcy, lack of liquidity, lack of funding, operational failures or for other reasons;

•significant job losses and/or a sustained shift away from collective in-person work environments or relocations away from the markets in which we operate may occur, which could decrease overall demand for workplaces in the regions in which we operate and cause market rental rates and property values to be negatively impacted;

•tightening labor market conditions may adversely affect our ability to recruit and retain talent, which may result in lack of business continuity and increased costs to address the labor challenges;

•our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and development opportunities and refinance existing debt, reduce our returns from our acquisition and development activities and increase our future interest expense;

•reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may reduce the availability of unsecured loans;

•the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, a dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other factors;

•one or more lenders under our line of credit could refuse to fund their financing commitment to us or could fail and we may not be able to replace the financing commitment of any such lenders on favorable terms, or at all; and

•to the extent we enter into derivative financial instruments, one or more counterparties to our derivative financial instruments could default on their obligations to us, or could fail, increasing the risk that we may not realize the benefits of these instruments.

The outbreak of highly infectious or contagious diseases, such as COVID-19, could adversely impact or cause disruption to our financial condition, results of operations, cash flows and liquidity and that of our clients.

Public health crises such as pandemics or similar outbreaks could adversely impact our business. For example, there remains uncertainty regarding the degree to which the COVID-19 pandemic may continue to adversely impact our business, financial condition, results of operation, cash flows and liquidity, and that of our clients. These uncertainties include the emergence of new virus strains, availability of effective treatment, possible future governmental responses and the severity and duration of the indirect economic and social impacts of the COVID 19-pandemic, such as economic downturn, supply chain disruptions, labor market disruptions, inflation, increasing interest rates, dislocation and volatility in capital markets, job losses and potential longer-term changes in consumer and client behavior. These uncertainties make it impossible for us to predict with certainty the overall impact that COVID-19 will have on us and our clients prospectively. Factors related to COVID-19 that have had, or could have, a material adverse effect on our results of operations and financial condition, include:

•changes made by companies in response to the COVID-19 pandemic that could lead to a sustained shift away from collective in-person work environments or relocations away from the markets in which we operate, either of which could adversely affect the overall demand for workplaces in the regions in which we operate;

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•reduced economic activity and/or supply chain disruptions or delays in delivery of products, services or other materials necessary for our clients that impact our clients’ businesses, financial condition or liquidity has caused, and may continue to cause, one or more of our clients to be unable to meet their obligations to us, including their ability to make timely rental payments, in full or at all, or to otherwise seek modifications of such obligations, including rent concessions, deferrals or abatements, or to declare bankruptcy. Any one or more of the foregoing could:

•reduce our cash flows,

•adversely impact our ability to finance, refinance or sell a property,

•adversely impact our ability to continue paying distributions to our equityholders at current levels, or at all, and

•result in additional legal and other costs to enforce our rights, collect rent and/or re-lease the space occupied by the distressed client;

•the degree to which our clients’ businesses have been, and continue to be, negatively impacted has required, and may in the future require, us to write-off a client’s accrued rent balance and this could have a material adverse effect on our results of operations and liquidity;

•new laws, governmental policies, and similar actions, including legal restrictions on prosecutions, could adversely impact public safety and thereby adversely affect (1) the desirability of clients to lease space in our properties or markets, and (2) businesses’ office re-population plans;

•the impact of COVID-19 could result in an event or change in circumstances that results in an impairment in the value of our properties or our investments in unconsolidated joint ventures, and any such impairment could have a material adverse effect on our results of operations in the periods in which the charge is taken;

•we may be unable to restructure or amend leases with certain of our clients on terms favorable to us or at all;

•the impact and validity of interpretations of lease provisions and applicable laws related to claims by clients regarding their obligations to pay rent as a result of COVID-19, and any adverse court rulings or decisions interpreting these provisions and laws, could have a material adverse effect on our results of operations and liquidity;

•the impact of governmental and business travel limitations and restrictions have had, and may in the future have, a material adverse effect on the operator of our hotel property, which negatively impacts our revenues, and may result in sustained decreased demand for hotel stays;

•the extent of labor shortages, disruptions in the supply chains, inflation impacting costs of materials, delays in permitting or inspections, and other factors could result in our failure to meet the development milestones set forth in any applicable lease agreement, which could provide the client the right to terminate its lease or entitle the client to monetary damages, delay the commencement or completion of construction and our anticipated lease-up plans for a development/redevelopment project or our overall development pipeline, including recognizing revenue for new leases, that may cause returns on investment to be less than projected, and/or increase the costs of construction of new or existing projects, any of which could adversely affect our investment returns, profitability and/or our future growth; and

•the potential that business interruption, loss of rental income and/or other associated expenses related to our operations will not be covered in whole or in part by our insurance policies, which may increase unreimbursed liabilities.

Our success depends on key personnel whose continued service is not guaranteed. 

We depend on the efforts of key personnel, particularly Owen D. Thomas, Chief Executive Officer, Douglas T. Linde, President, and Raymond A. Ritchey, Senior Executive Vice President. Among the reasons that Messrs. Thomas, Linde and Ritchey are important to our success is that each has a national reputation, which attracts business and investment opportunities and assists us in negotiations with lenders, joint venture partners and other investors. If we lost their services, our relationships with lenders, potential clients and industry personnel could diminish.  

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Our Chief Financial Officer and Regional Managers also have strong reputations. Their reputations aid us in identifying opportunities, having opportunities brought to us, and negotiating with clients and build-to-suit prospects. While we believe that we could find replacements for these key personnel, the loss of their services could materially and adversely affect our operations because of diminished relationships with lenders, prospective clients and industry personnel. 

Risks Related to Real Estate

Our performance and value are subject to risks associated with our real estate assets and with the real estate industry.

Our economic performance and the value of our real estate assets, and consequently the value of our securities, are subject to the risk that if our properties do not generate revenues sufficient to meet our operating expenses, including debt service and capital expenditures, our cash flow and ability to pay distributions to our securityholders will be adversely affected. The following factors, among others, may adversely affect the income generated by our properties:

•downturns in the national, regional and local economic conditions (particularly increases in unemployment);

•changes in client preferences and space utilization from full-time, collective in-person work environments to hybrid or remote work models, which could decrease overall demand for workplaces and cause market rental rates and property values to be negatively impacted;

•competition from other office, life sciences, hotel, retail and residential buildings;

•local real estate market conditions, such as oversupply or reduction in demand for office, life sciences, hotel, retail or residential space;

•changes in interest rates and availability of financing;

•vacancies, changes in market rental rates and the need to periodically repair, renovate and re-let space;

•delays in completion of development and redevelopment projects due to supply chain disruptions and labor shortages;

•increased costs to maintain, renovate and develop our properties related to inflation;

•changes in space utilization by our clients due to technology, economic conditions and business culture;

•increased operating costs, including insurance expense, utilities, real estate taxes, state and local taxes and heightened security costs;

•civil disturbances, earthquakes and other natural disasters or terrorist acts or acts of war which may result in uninsured or underinsured losses or decrease the desirability to our clients in impacted locations;

•significant expenditures associated with each investment, such as debt service payments, real estate taxes (including reassessments and changes in tax laws), insurance and maintenance costs which are generally not reduced when circumstances cause a reduction in revenues from a property;

•declines in the financial condition of our clients and our ability to collect rents from our clients; and

•decreases in the underlying value of our real estate.

We face potential adverse effects from major clients’ bankruptcies or insolvencies.

The bankruptcy or insolvency of a major client may adversely affect the income produced by our properties. Our clients could file for bankruptcy protection or become insolvent in the future. We cannot evict a client solely because of its bankruptcy. On the other hand, a bankrupt client may reject and terminate its lease with us. In such case, our claim against the bankrupt client for unpaid and future rent would be subject to a statutory cap that might be substantially less than the remaining rent actually owed under the lease, and, even so, our claim for unpaid rent would likely not be paid in full. This shortfall could adversely affect our cash flow and results of operations.

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Our properties face significant competition.

We face significant competition from developers, owners and managers of office, life sciences and residential properties and other commercial real estate, including sublease space available from our clients. Substantially all of our properties face competition from similar properties in the same market. This competition may affect our ability to attract and retain clients and may reduce the rents we are able to charge. These competing properties may have vacancy rates higher than our properties, which may result in their owners being willing to lease available space at lower rates than the space in our properties.

We face potential difficulties or delays renewing leases or re-leasing space.

We derive most of our income from rent received from our clients. If a client experiences a downturn in its business or other types of financial distress, it may be unable to make timely rental payments. Also, when our clients decide not to renew their leases, renew for less space or terminate early, we may not be able to re-let the space or there could be a substantial delay in re-letting the space. Even if clients decide to renew or lease new space, the terms of renewals or new leases, including the cost of required renovations or concessions to clients, may be less favorable to us than current lease terms. As a result, our cash flow could decrease and our ability to make distributions to our securityholders could be adversely affected.

Our actual costs to develop properties may exceed our budgeted costs.

We intend to continue to develop and substantially renovate office, life sciences, retail and residential properties. Our current and future development and construction activities may be exposed to the following risks: 

•we may be unable to proceed with the development of properties because we cannot obtain financing on favorable terms or at all;

•we may incur construction costs for a development project that exceed our original estimates due to increased materials, labor, leasing or other costs, increases in interest rates, or supply chain disruptions, any of which could make completion of the project less profitable because market rents may not increase sufficiently to compensate for the increase in construction costs;

•we may be unable to obtain, or face delays in obtaining, required zoning, land-use, building, occupancy, and other governmental permits and authorizations, which could result in increased costs and could require us to abandon our activities entirely with respect to a project;

•we may abandon development opportunities after we begin to explore them and, as a result, we may lose deposits or fail to recover expenses already incurred;

•we may expend funds on and devote management’s time to projects that we do not complete;

•we may be unable to complete construction and/or leasing of a property on schedule or at all; and

•we may suspend development projects after construction has begun due to changes in economic conditions or other factors, and this may result in the write-off of costs, payment of additional costs or increases in overall costs when the development project is restarted.

Investment returns from our developed properties may be less than anticipated. 

Our developed properties may be exposed to the following risks:

•we may lease developed properties at rental rates that are less than projected, or at a slower pace than projected, at the time we decide to undertake the development;

•operating expenses and construction costs may be greater than projected at the time of development, resulting in our investment being less profitable than we expected; and

•occupancy rates and rents at newly developed properties may fluctuate depending on a number of factors, including market and economic conditions, and may result in our investments being less profitable than we expected or not profitable at all.

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We face risks associated with the development of mixed-use commercial properties.

We operate, are currently developing, and may in the future develop, properties either alone or through joint ventures with other persons that are known as “mixed-use” developments. This means that in addition to the development of office space, the project may also include space for residential, retail, hotel or other commercial purposes. We have less experience in developing and managing non-office and non-retail real estate than we do with office real estate. As a result, if a development project includes a non-office or non-retail use, we may seek to develop that component ourselves, sell the rights to that component to a third-party developer with experience in that use or we may seek to partner with such a developer. If we do not sell the rights or partner with such a developer, or if we choose to develop the other component ourselves, we would be exposed not only to those risks typically associated with the development of commercial real estate generally, but also to specific risks associated with the development and ownership of non-office and non-retail real estate. In addition, even if we sell the rights to develop the other component or elect to participate in the development through a joint venture, we may be exposed to the risks associated with the failure of the other party to complete the development as expected. These include the risk that the other party would default on its obligations necessitating that we complete the other component ourselves (including providing any necessary financing). In the case of residential properties, these risks include competition for prospective residents from other operators whose properties may be perceived to offer a better location or better amenities or whose rent may be perceived as a better value given the quality, location and amenities that the resident seeks. We will also compete against condominiums and single-family homes that are for sale or rent. Because we have less experience with residential properties than with office and retail properties, we expect to retain third parties to manage our residential properties. If we decide to not sell or participate in a joint venture and instead hire a third party manager, we would be dependent on them and their key personnel who provide services to us and we may not find a suitable replacement if the management agreement is terminated, or if key personnel leave or otherwise become unavailable to us. 

Our use of joint ventures and participation in the Strategic Capital Program may limit our control over and flexibility with jointly owned investments and other assets we may wish to acquire.

In appropriate circumstances, we intend to acquire and recapitalize or develop, as applicable, properties in joint ventures with other persons or entities. We currently have joint ventures that are and are not consolidated within our financial statements. Our participation in joint ventures subjects us to risks, including but not limited to, the following risks that:

•our joint venture partners may have different objectives than we have regarding the appropriate timing and terms of any sale or refinancing of a property, its operation or, if applicable, the commencement of development activities, and a dispute with any of our joint venture partners could lead to the sale of a partner’s ownership interest in the venture or the property at a time or price that we do not find attractive;

•some of our joint ventures are subject to debt and, depending on credit market conditions, the refinancing of such debt may require equity capital calls;

•our joint venture partners may be structured differently than us for tax purposes and this could create conflicts of interest, including with respect to our compliance with the REIT requirements, and our REIT status could be jeopardized if any of our joint ventures do not operate in compliance with REIT requirements;

•our joint venture partners may have competing interests in our markets that could create conflicts of interest;

•our joint venture partners may default on their obligations, which could necessitate that we fulfill their obligations ourselves;

•our joint ventures may be unable to repay any amounts that we may loan to them;

•our joint venture agreements may contain provisions limiting the liquidity of our interest for sale or sale of the entire asset;

•as the general partner or managing member of a joint venture, we could be generally liable under applicable law for the debts and obligations of the venture, and we may not be entitled to contribution or indemnification from our partners;

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•our joint venture agreements may contain provisions that allow our partners to remove us as the general partner or managing member for cause, and this could result in liability for us to our partners under the governing agreement of the joint venture;

•we may need our partner(s)’ approval to take certain actions and, therefore, we may be unable to cause a joint venture to implement decisions that we consider advisable; and

•with respect to our participation in the co-investment program, we could lose opportunities to pursue properties that are within the program’s target investment criteria alone or with other partners with whom the terms of the joint venture and/or our returns could be more favorable to us.

We face the risk that third parties will not be able to service or repay loans we make to them.

From time to time, we have loaned and in the future may loan funds to (1) a third-party buyer to facilitate the sale of an asset by us to such third party, or (2) a third party in connection with the formation of a joint venture to acquire and/or develop a property. Making these loans subjects us to the following risks, each of which could have a material adverse effect on our cash flow, results of operations and/or financial condition:

•the third party may be unable to make full and timely payments of interest and principal on the loan when due;

•if the third-party buyer to whom we provide seller financing does not manage the property well, or the property otherwise fails to meet financial projections, performs poorly or declines in value, then the buyer may not have the funds or ability to raise new debt with which to make required payments of interest and principal to us;

•if we loan funds to a joint venture, and the joint venture is unable to make required payments of interest or principal, or both, or there are disagreements with respect to the repayment of the loan or other matters, then we could have a resulting dispute with our partner(s), and such a dispute could harm our relationship(s) with our partner(s) and cause delays in developing or selling the property or the failure to properly manage the property; and

•if we loan funds to a joint venture and the joint venture is unable to make required payments of interest and principal, or both, then we may exercise remedies available to us in the joint venture agreement that could allow us to increase our ownership interest or our control over major decisions, or both, which could result in an unconsolidated joint venture becoming consolidated with our financial statement; doing so could require us to reallocate the purchase price among the various asset and liability components and this could result in material changes to our reported results of operations and financial condition.

We face risks associated with property acquisitions. 

We have acquired in the past and intend to continue to pursue the acquisition of properties and portfolios of properties, including large portfolios that could increase our size and result in alterations to our capital structure. Our acquisition activities and their success are subject to the following risks: 

•even if we enter into an acquisition agreement for a property, we may be unable to complete that acquisition after making a non-refundable deposit and incurring certain other acquisition-related costs;

•we may be unable to obtain or assume financing for acquisitions on favorable terms or at all;

•acquired properties may fail to perform as expected;

•the actual costs of repositioning, redeveloping or maintaining acquired properties may be greater than our estimates;

•the acquisition agreement will likely contain conditions to closing, including completion of due diligence investigations to our satisfaction or other conditions that are not within our control, which may not be satisfied;

•acquired properties may be located in new markets, either within or outside the United States, where we may face risks associated with a lack of market knowledge or understanding of the local economy, lack of business relationships in the area, costs associated with opening a new regional office and unfamiliarity with local governmental and permitting procedures;

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•we may acquire real estate through the acquisition of the ownership entity subjecting us to the risks of that entity; and

•we may be unable to quickly and efficiently integrate new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations, and this could have an adverse effect on our results of operations and financial condition.

We have acquired in the past and in the future may acquire properties through the acquisition of first mortgage or mezzanine debt. Investments in these loans must be carefully structured to ensure that BXP continues to satisfy the various asset and income requirements applicable to REITs. If we fail to structure any such acquisition properly, BXP could fail to qualify as a REIT. In addition, acquisitions of first mortgage or mezzanine loans subject us to the risks associated with the borrower’s default, including potential bankruptcy, and there may be significant delays and costs associated with the process of foreclosure on collateral securing or supporting these investments.  There can be no assurance that we would recover any or all of our investment in the event of such a default or bankruptcy. 

We have acquired in the past and in the future may acquire properties or portfolios of properties through tax deferred contribution transactions in exchange for partnership interests in BPLP. This acquisition structure has the effect, among others, of reducing the amount of tax depreciation we can deduct over the tax life of the acquired properties, and typically requires that we agree to protect the contributors’ ability to defer recognition of taxable gain through restrictions on our ability to dispose of the acquired properties and/or the allocation of partnership debt to the contributors to maintain their tax bases. These restrictions could limit our ability to sell an asset at a time, or on terms, that would be favorable absent such restrictions. 

Acquired properties may expose us to unknown liability. 

We may acquire properties or invest in joint ventures that own properties subject to liabilities and without any recourse, or with only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations and cash flow. Unknown liabilities with respect to acquired properties might include: 

•liabilities for clean-up of undisclosed environmental contamination;

•claims by clients, vendors or other persons against the former owners of the properties;

•liabilities incurred in the ordinary course of business; and

•claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

Competition for acquisitions may result in increased prices for properties. 

We plan to continue to acquire properties as we are presented with attractive opportunities. We may face competition for acquisition opportunities with other investors, and this competition may adversely affect us by subjecting us to the following risks: 

•we may be unable to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and private REITs, institutional investment funds and other real estate investors; and

•even if we are able to acquire a desired property, competition from other real estate investors may significantly increase the purchase price.

We may have difficulty selling our properties, which may limit our flexibility. 

Properties like the ones that we own could be difficult to sell. This may limit our ability to change our portfolio promptly in response to changes in economic or other conditions. In addition, federal tax laws limit our ability to sell properties and this may affect our ability to sell properties without adversely affecting returns to our securityholders. These restrictions reduce our ability to respond to changes in the performance of our investments and could adversely affect our financial condition and results of operations. 

Our ability to dispose of some of our properties is constrained by their tax attributes. Properties that we developed and have owned for a significant period of time or that we acquired through tax deferred contribution

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transactions in exchange for partnership interests in BPLP often have low tax bases. Furthermore, as a REIT, BXP may be subject to a 100% “prohibited transactions” tax on the gain from dispositions of property if BXP is deemed to hold the property primarily for sale to customers in the ordinary course of business, unless the disposition qualifies under a safe harbor exception for properties that have been held for at least two years and with respect to which certain other requirements are met. The potential application of the prohibited transactions tax could cause us to forego potential dispositions of property or other opportunities that might otherwise be attractive to us, or to undertake such dispositions or other opportunities through a taxable REIT subsidiary, which would generally result in income taxes being incurred. If we dispose of these properties outright in taxable transactions, we may be required to distribute a significant amount of the taxable gain to our securityholders under the requirements of the Code applicable to REITs, which in turn would impact our future cash flow and may increase our leverage. In some cases, without incurring additional costs we may be restricted from disposing of properties contributed in exchange for our partnership interests under tax protection agreements with contributors. To dispose of low basis or tax-protected properties efficiently we from time to time use like-kind exchanges, which are intended to qualify for non-recognition of taxable gain, but can be difficult to consummate and result in the property for which the disposed assets are exchanged inheriting their low tax bases and other tax attributes (including tax protection covenants). 

Because we own a hotel property, we face the risks associated with the hospitality industry. 

The following factors, among others, are common to the hotel industry, and may reduce the receipts generated by our hotel property: 

•our hotel property competes for guests with other hotels, a number of which may have greater marketing and financial resources than our hotel-operating business partners;

•if there is an increase in operating costs resulting from inflation and other factors, our hotel-operating business partners may not be able to offset such increase by increasing room rates;

•our hotel property is subject to the fluctuating and seasonal demands of business travelers and tourism; and

•our hotel property is subject to general and local economic and social conditions that may affect demand for travel in general, including war and terrorism.

In addition, because our hotel property is located in Cambridge, Massachusetts, it is subject to the Cambridge market’s fluctuations in demand, increases in operating costs and increased competition from additions in supply.

Failure to comply with Federal Government contractor requirements could result in substantial costs and loss of substantial revenue. 

As of December 31, 2022, the U.S. Government was one of our largest clients by square feet. We are subject to compliance with a wide variety of complex legal requirements because we are a Federal Government contractor. These laws regulate how we conduct business, require us to administer various compliance programs and require us to impose compliance responsibilities on some of our contractors. Our failure to comply with these laws could subject us to fines, penalties and damages, cause us to be in default of our leases and other contracts with the Federal Government and bar us from entering into future leases and other contracts with the Federal Government. There can be no assurance that these costs and loss of revenue will not have a material adverse effect on our properties, operations or business.

Changes in rent control or rent stabilization and eviction laws and regulations in our markets could have a material adverse effect on our residential portfolio’s results of operations and residential property values.

Various state and local governments have enacted, and may continue to enact, rent control or rent stabilization laws and regulations or take other actions that could limit our ability to raise rents or charge certain fees, such as pet fees or application fees. We have seen a recent increase in governments considering, or being urged by advocacy groups to consider, rent control or rent stabilization laws and regulations. Depending on the extent and terms of future enactments of rent control or rent stabilization laws and regulations, as well as any lawsuits against us arising from such issues, such future enactments could have a material adverse effect on our residential portfolio’s results of operations and the value of our residential properties.

State and local governments may also make changes to eviction and other tenants’ rights laws and regulations that could have a material adverse effect on our residential portfolio’s results of operations and the value of our residential properties. If we are restricted from re-leasing apartment units due to the inability to evict

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delinquent residents, our results of operations and property values for our residential properties may be adversely affected.

We did not obtain new owner’s title insurance policies in connection with properties acquired during BXP’s initial public offering. 

We acquired many of our properties from our predecessors at the completion of BXP’s initial public offering in June 1997. Before we acquired these properties, each of them was insured by a title insurance policy. We did not obtain new owner’s title insurance policies in connection with the acquisition of these properties. To the extent we have financed properties after acquiring them in connection with the initial public offering, we have obtained new title insurance policies, however, the amount of these policies may be less than the current or future value of the applicable properties. Nevertheless, because in many instances we acquired these properties indirectly by acquiring ownership of the entity that owned the property and those owners remain in existence as our subsidiaries, some of these title insurance policies may continue to benefit us. Many of these title insurance policies may be for amounts less than the current or future values of the applicable properties. If there was a title defect related to any of these properties, or to any of the properties acquired at the time of the initial public offering of BXP, that is no longer covered by a title insurance policy, we could lose both our capital invested in and our anticipated profits from such property. We have obtained title insurance policies for all properties that we have acquired after the initial public offering of BXP, however, these policies may be for amounts less than the current or future values of the applicable properties. 

Some potential losses are not covered by insurance. 

Our property insurance program per occurrence limits are $1.0 billion for our portfolio insurance program, including coverage for acts of terrorism other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). We also carry $1.35 billion of property insurance in excess of the $1.0 billion of coverage in our property insurance program for 601 Lexington Avenue, New York, New York, consisting of $750 million of property and Terrorism Coverage in excess of our property insurance program and $600 million of Terrorism Coverage only in excess of the $1.75 billion of coverage.

Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage. We also currently carry nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which we manage. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage provided by IXP is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $200 million, the coinsurance is 20% and the deductible is 20% of the premiums earned by the insurer for the year prior to a claim. If the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIA. We may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if TRIA is not extended after its expiration on December 31, 2027, if there is a change in our portfolio or for any other reason. We intend to continue to monitor the scope, nature and cost of available terrorism insurance.

We also currently carry earthquake insurance on our properties located in areas known to be subject to earthquakes. Specifically, we currently carry earthquake insurance which covers our San Francisco and Los Angeles regions with a $330 million per occurrence limit, and a $330 million annual aggregate limit, $30 million of which is provided by IXP, as a direct insurer. This insurance is subject to a deductible in the amount of 3% of the value of the affected property. In addition, we currently carry earthquake insurance which covers our Seattle region with a $110 million per occurrence limit, and a $110 million annual aggregate limit. This insurance is subject to a deductible in the amount of 2% of the value of the affected property. The amount of our earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact our ability to finance properties subject to earthquake risk. We may discontinue earthquake insurance or change the structure of our earthquake insurance program on some or all of our properties in the future if the premiums exceed our estimation of the value of the coverage.

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IXP, a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our earthquake insurance coverage for our Greater San Francisco and Los Angeles properties and our NBCR Coverage. Insofar as we own IXP, we are responsible for its liquidity and capital resources, and the accounts of IXP are part of our consolidated financial statements. In particular, if a loss occurs which is covered by our NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and its insurance policy is maintained after the payout by the Federal Government. If we experience a loss and IXP is required to pay under its insurance policy, we would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, BPLP has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

We continue to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism, earthquakes and pandemics, in particular, but we cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which we cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes, pandemics or other catastrophic events, if we experience a loss that is uninsured or that exceeds policy limits, we could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that we could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect our business and financial condition and results of operations.

Actual or threatened terrorist attacks may adversely affect our ability to generate revenues and the value of our properties. 

We have significant investments in large metropolitan markets that have been or may be in the future the targets of actual or threatened terrorism attacks, including Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. As a result, some clients in these markets may choose to relocate their businesses to other markets or to lower-profile office buildings within these markets that may be perceived to be less likely targets of future terrorist activity. This could result in an overall decrease in the demand for office space in these markets generally or in our properties in particular, which could increase vacancies in our properties or necessitate that we lease our properties on less favorable terms or both. In addition, future terrorist attacks in these markets could directly or indirectly damage our properties, both physically and financially, or cause losses that materially exceed our insurance coverage. As a result of the foregoing, our ability to generate revenues and the value of our properties could decline materially. See also “—Some potential losses are not covered by insurance.” 

We face risks associated with our clients and contractual counterparties being designated “Prohibited Persons” by the Office of Foreign Assets Control. 

Pursuant to Executive Order 13224 and other laws, the Office of Foreign Assets Control of the United States Department of the Treasury (“OFAC”) maintains a list of persons designated as terrorists or who are otherwise blocked or banned (“Prohibited Persons”). OFAC regulations and other laws prohibit conducting business or engaging in transactions with Prohibited Persons (the “OFAC Requirements”). Certain of our loan and other agreements require us to comply with OFAC Requirements. We have established a compliance program whereby clients and others with whom we conduct business are checked against the OFAC list of Prohibited Persons prior to entering into any agreement and on a periodic basis thereafter. Our leases and other agreements, in general, require the other party to comply with OFAC Requirements. If a client or other party with whom we contract is placed on the OFAC list we may be required by the OFAC Requirements to terminate the lease or other agreement. Any such termination could result in a loss of revenue or a damage claim by the other party that the termination was wrongful. 

We face risks associated with climate change and severe weather events, as well as the regulatory efforts intended to reduce the effects of climate change. 

The physical effects of climate change could have a material adverse effect on our properties, operations and business. For example, many of our properties are located along the East and West coasts, particularly those in the central business districts of Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. To the extent climate change causes changes in weather patterns, our markets could experience increases in storm intensity, extreme temperatures, rising sea-levels and/or drought. Over time, these conditions could result in

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declining demand for office space in our buildings or increased costs associated with infrastructure-related remediation projects. Climate change may also have indirect effects on our business by making property insurance unavailable or by increasing the cost of (i) property insurance on terms we find acceptable, (ii) real estate taxes or other assessments, (iii) energy and (iv) property maintenance. In addition, we face transition risks related to federal, state and local legislation and regulations that are being implemented or are under consideration to mitigate the effects of climate change. The costs of complying with evolving regulatory requirements, including GHG emissions regulations and policies, could negatively impact our financial results.

For additional discussion regarding our approach to climate resiliency and our continued commitment to transparent reporting of ESG performance indicators, see “Item 1. Business—Business and Growth Strategies—Environmental, Social and Governance (ESG)” and our annual ESG report available on our website at http://www.bxp.com under the heading “Commitment.”

Potential liability for environmental contamination could result in substantial costs.

Under federal, state and local environmental laws, ordinances and regulations, we may be required to investigate and clean up the effects of releases of hazardous or toxic substances or petroleum products at or migrating from our properties simply because of our current or past ownership or operation of the real estate. If unidentified environmental problems arise, we may have to make substantial payments, which could adversely affect our cash flow and our ability to make distributions to our securityholders, because: as owner or operator we may have to pay for property damage and for investigation and clean-up costs incurred in connection with the contamination; the law typically imposes clean-up responsibility and liability regardless of whether the owner or operator knew of or caused the contamination; even if more than one person may be responsible for the contamination, each person who shares legal liability under the environmental laws may be held responsible for all of the clean-up costs; and governmental entities and third parties may sue the owner or operator of a contaminated site for damages and costs.

These costs could be substantial and in extreme cases could exceed the amount of our insurance or the value of the contaminated property. We currently carry environmental insurance in an amount and subject to deductibles that we believe are commercially reasonable. Specifically, we carry a pollution legal liability policy with a $20 million limit per incident and a policy aggregate limit of $40 million. The presence or migration of hazardous or toxic substances or petroleum products or the failure to properly remediate contamination may give rise to third-party claims for bodily injury, property damage and/or response costs and may materially and adversely affect our ability to borrow against, sell or rent an affected property. In addition, applicable environmental laws create liens on contaminated sites in favor of the government for damages and costs it incurs in connection with contamination. Changes in laws, regulations and practices and their implementation increasing the potential liability for environmental conditions existing at our properties, or increasing the restrictions on the handling, storage or discharge of hazardous or toxic substances or petroleum products or other actions may result in significant unanticipated expenditures.

Environmental laws also govern the presence, maintenance and removal of asbestos and other building materials. For example, laws require that owners or operators of buildings containing asbestos: 

•properly manage and maintain the asbestos;

•notify and train those who may come into contact with asbestos; and

•undertake special precautions, including removal or other abatement, if asbestos would be disturbed during renovation or demolition of a building.

Such laws may impose fines and penalties on building owners or operators who fail to comply with these requirements and may allow third parties to seek recovery from owners or operators for personal injury associated with exposure to asbestos fibers. 

Some of our properties are located in urban and previously developed areas where fill or current or historic industrial uses of the areas have caused site contamination. It is our policy to retain independent environmental consultants to conduct or update Phase I environmental site assessments and asbestos surveys with respect to our acquisition of properties. These assessments generally include a visual inspection of the properties and the surrounding areas, an examination of current and historical uses of the properties and the surrounding areas and a review of relevant state, federal and historical documents, but do not involve invasive techniques such as soil and ground water sampling. Where appropriate, on a property-by-property basis, our practice is to have these

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consultants conduct additional testing, including sampling for asbestos, for lead and other contaminants in drinking water and, for soil and/or groundwater contamination where underground storage tanks are or were located or where other past site usage creates a potential environmental problem. Even though these environmental assessments are conducted, there is still the risk that: 

•the environmental assessments and updates did not identify or properly address all potential environmental liabilities;

•a prior owner created a material environmental condition that is not known to us or the independent consultants preparing the assessments;

•new environmental liabilities have developed since the environmental assessments were conducted; and

•future uses or conditions such as changes in applicable environmental laws and regulations could result in environmental liability for us.

Inquiries about indoor air quality may necessitate special investigation and, depending on the results, remediation beyond our regular indoor air quality testing and maintenance programs. Indoor air quality issues can stem from inadequate ventilation, chemical contaminants from indoor or outdoor sources, and biological contaminants such as molds, pollen, viruses and bacteria. Indoor exposure to chemical or biological contaminants can be alleged to be connected to allergic reactions or other adverse health effects. If these conditions were to occur at one of our properties, we may be subject to third-party claims for personal injury, or may need to undertake a targeted remediation program, including without limitation, special cleaning measures and steps to increase indoor ventilation rates and eliminate sources of contaminants. Such remediation programs could be costly, necessitate the temporary relocation of some or all of the property’s clients or require rehabilitation of the affected property. 

Compliance or failure to comply with the Americans with Disabilities Act or other safety regulations and requirements could result in substantial costs. 

The Americans with Disabilities Act generally requires that certain buildings, including office buildings, residential buildings and hotels, be made accessible to disabled persons. Noncompliance could result in the imposition of fines by the federal government or the award of damages to private litigants. If, under the Americans with Disabilities Act, we are required to make substantial alterations and capital expenditures in one or more of our properties, including the removal of access barriers, it could adversely affect our financial condition and results of operations, as well as the amount of cash available for distribution to our securityholders. 

Our properties are subject to various federal, state and local regulatory requirements, such as state and local fire and life safety requirements. If we fail to comply with these requirements, we could incur fines or private damage awards. We do not know whether existing requirements will change or whether compliance with future requirements will require significant unanticipated expenditures that will affect our cash flow and results of operations. 

Any future international activities will be subject to special risks and we may not be able to effectively manage our international business. 

We have underwritten, and in the future may acquire, properties, portfolios of properties or interests in real estate-related entities on a strategic or selective basis in international markets that are new to us. If we acquire properties or platforms located in these markets, we will face risks associated with a lack of market knowledge and understanding of the local economy, forging new business relationships in the area and unfamiliarity with local laws and government and permitting procedures. In addition, our international operations will be subject to the usual risks of doing business abroad such as possible revisions in tax treaties or other laws and regulations, including those governing the taxation of our international income, restrictions on the transfer of funds and uncertainty over terrorist activities. We cannot predict the likelihood that any of these developments may occur. Further, we may in the future enter into agreements with non-U.S. entities that are governed by the laws of, and are subject to dispute resolution in the courts of, another country or region. We cannot accurately predict whether such a forum would provide us with an effective and efficient means of resolving disputes that may arise. 

Investments in international markets may also subject us to risks associated with funding increasing headcount, integrating new offices, and establishing effective controls and procedures to regulate the operations of new offices and to monitor compliance with U.S. laws and regulations such as the Foreign Corrupt Practices Act and similar foreign laws and regulations, such as the U.K. Bribery Act.

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We may be subject to risks from potential fluctuations in exchange rates between the U.S. dollar and the currencies of the other countries in which we invest. 

If we invest in countries where the U.S. dollar is not the national currency, we will be subject to international currency risks from the potential fluctuations in exchange rates between the U.S. dollar and the currencies of those other countries. A significant depreciation in the value of the currency of one or more countries where we have a significant investment may materially affect our results of operations. We may attempt to mitigate any such effects by borrowing in the currency of the country in which we are investing and, under certain circumstances, by hedging exchange rate fluctuations; however, access to capital may be more restricted, or unavailable on favorable terms or at all, in certain locations. For leases denominated in international currencies, we may use derivative financial instruments to manage the international currency exchange risk. We cannot assure you, however, that our efforts will successfully neutralize all international currency risks. 

Risks Related to Our Indebtedness and Financing

An increase in interest rates would increase our interest costs on variable rate debt and could adversely impact our ability to refinance existing debt or sell assets on favorable terms or at all. 

As of February 21, 2023, we had $1.2 billion outstanding indebtedness, excluding our unconsolidated joint ventures, that bears interest at a variable rate, and we may incur more indebtedness in the future. Interest rates increased throughout 2022, and if interest rates continue to increase, then so would the interest costs on our unhedged variable rate debt, which could adversely affect our cash flow and our ability to pay principal and interest on our debt and our ability to make distributions to our securityholders. Further, rising interest rates could limit our ability to refinance existing debt when it matures or significantly increase our future interest expense. From time to time, we enter into interest rate swap agreements and other interest rate hedging contracts, including swaps, caps and floors. While these agreements are intended to lessen the impact of rising interest rates on us, they also expose us to the risk that the other parties to the agreements will not perform, we could incur significant costs associated with the settlement of the agreements, the agreements will be unenforceable and the underlying transactions will fail to qualify as highly-effective cash flow hedges under guidance included in ASC 815 “Derivatives and Hedging.” In addition, an increase in interest rates could decrease the amounts third-parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions. 

Covenants in our debt agreements could adversely affect our financial condition.

The mortgages on our properties contain customary covenants such as those that limit our ability, without the prior consent of the lender, to further mortgage the applicable property or to modify or discontinue insurance coverage. Our unsecured credit facility, unsecured debt securities and certain secured loans contain customary restrictions, requirements and other limitations on our ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt, which we must maintain. Our continued ability to borrow under our credit facilities is subject to compliance with our financial and other covenants. In addition, our failure to comply with such covenants could cause a default under the applicable debt agreement, and we may then be required to repay such debt with capital from other sources. Under those circumstances, other sources of capital may not be available to us, or be available only on unattractive terms. Additionally, in the future our ability to satisfy current or prospective lenders’ insurance requirements may be adversely affected if lenders generally insist upon greater insurance coverage against acts of terrorism or losses resulting from earthquakes than is available to us in the marketplace or on commercially reasonable terms. 

We rely on debt financing, including borrowings under our unsecured credit facility, issuances of unsecured debt securities and debt secured by individual properties, to finance our existing portfolio, our acquisition and development activities and for working capital. If we are unable to obtain debt financing from these or other sources, or to refinance existing indebtedness upon maturity, our financial condition and results of operations would likely be adversely affected. If we breach covenants in our debt agreements, the lenders can declare a default and, if the debt is secured, can take possession of the property securing the defaulted loan. In addition, our unsecured debt agreements contain specific cross-default provisions with respect to specified other indebtedness, giving the unsecured lenders the right to declare a default if we are in default under other loans in some circumstances. Defaults under our debt agreements could materially and adversely affect our financial condition and results of operations. 

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We face risks associated with the use of debt to fund acquisitions and developments, including refinancing risk. 

We are subject to the risks normally associated with debt financing, including the risk that our cash flow will be insufficient to meet required payments of principal and interest. We anticipate that only a small portion of the principal of our debt will be repaid prior to maturity. Therefore, we are likely to need to refinance at least a portion of our outstanding debt as it matures. There is a risk that we may not be able to refinance existing debt or that the terms of any refinancing will not be as favorable as the terms of our existing debt. If principal payments due at maturity cannot be refinanced, extended or repaid with proceeds from other sources, such as new equity capital, our cash flow may not be sufficient to repay all maturing debt in years when significant “balloon” payments come due. In addition, we may rely on debt to fund a portion of our new investments such as our acquisition and development activity. There is a risk that we may be unable to finance these activities on favorable terms or at all. These conditions, which increase the cost and reduce the availability of debt, may continue or worsen in the future. 

We have had and may in the future have agreements with a number of limited partners of BPLP who contributed properties in exchange for partnership interests that require BPLP to maintain for specified periods of time secured debt on certain of our assets and/or allocate partnership debt to such limited partners to enable them to continue to defer recognition of their taxable gain with respect to the contributed property. These tax protection and debt allocation agreements may restrict our ability to repay or refinance debt.  As of December 31, 2022, we had one tax protection agreement that could restrict our ability to repay or finance debt.

Our degree of leverage could limit our ability to obtain additional financing or affect the market price of our equity and debt securities. 

As of February 21, 2023, our Consolidated Debt was approximately $14.7 billion (excluding unconsolidated joint venture debt).

The following table presents Consolidated Market Capitalization as well as the corresponding ratios of Consolidated Debt to Consolidated Market Capitalization (dollars and shares / units in thousands):

	February 21, 2023
	Shares / Units Outstanding	Common Stock Equivalent	Equivalent Value (1)
Common Stock	156,823	156,823	$	10,732,966
Common Operating Partnership Units	18,663	18,663	1,277,296			(2)
Total Equity (A)		175,486	$	12,010,262
Consolidated Debt (B)			$	14,707,348
Consolidated Market Capitalization (A + B)			$	26,717,610
Consolidated Debt/Consolidated Market Capitalization [B / (A + B)]			55.05		%

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(1)Values are based on the closing price per share of BXP’s Common Stock on February 21, 2023 of $68.44.

(2)Includes LTIP Units (including 2012 OPP Units and earned MYLTIP Units that were granted between 2013 - 2020), but excludes MYLTIP Units granted between 2021 and 2023 because the performance period for those awards has not yet ended.

Our degree of leverage could affect our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes. Our senior unsecured debt is currently rated investment grade by two major rating agencies. However, there can be no assurance that we will be able to maintain this rating, and in the event our senior debt is downgraded from its current rating, we would likely incur higher borrowing costs and/or difficulty in obtaining additional financing. Our degree of leverage could also make us more vulnerable to a downturn in business or the economy generally. There is a risk that changes in our debt to market capitalization ratio, which is in part a function of BXP’s stock price, or BPLP’s ratio of indebtedness to other measures of asset value used by financial analysts may have an adverse effect on the market price of our equity or debt securities. 

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The discontinuation of LIBOR and the replacement of LIBOR with an alternative reference rate may adversely affect our borrowing costs and could impact our business and results of operations.

We expect that all LIBOR settings relevant to us will cease to be published or will no longer be representative after June 30, 2023. The discontinuation of LIBOR will not affect our ability to borrow or maintain already outstanding borrowings or hedging transactions, but if our contracts indexed to LIBOR are converted to SOFR, the differences between LIBOR and SOFR, plus the recommended spread adjustment, could result in interest or hedging costs that are higher than if LIBOR remained available. Additionally, although SOFR is the recommended replacement rate, it is also possible that lenders may instead choose alternative replacements that may differ from LIBOR in ways similar to SOFR or in ways that would result in higher interest or hedging costs for us. It is not yet possible to predict the magnitude of LIBOR’s end on our borrowing costs given the remaining uncertainty about which rates will replace LIBOR. As of December 31, 2022, each of the agreements governing our variable rate debt either have been transitioned to SOFR or provide for the replacement of LIBOR if it becomes unavailable during the term of such agreement.

We face risks associated with short-term liquid investments. 

We may invest cash balances in a variety of short-term investments that are intended to preserve principal value and maintain a high degree of liquidity while providing current income. From time to time, these investments may include (either directly or indirectly): 

•direct obligations issued by the U.S. Treasury;

•obligations issued or guaranteed by the U.S. Government or its agencies;

•taxable municipal securities;

•obligations (including certificates of deposit) of banks and thrifts;

•commercial paper and other instruments consisting of short-term U.S. dollar denominated obligations issued by corporations and banks;

•repurchase agreements collateralized by corporate and asset-backed obligations;

•both registered and unregistered money market funds; and

•other highly rated short-term securities.

Investments in these securities and funds are not insured against loss of principal. Under certain circumstances we may be required to redeem all or part of our investment, and our right to redeem some or all of our investment may be delayed or suspended. In addition, there is no guarantee that our investments in these securities or funds will be redeemable at par value. A decline in the value of our investment or a delay or suspension of our right to redeem may have a material adverse effect on our results of operations or financial condition. 

Risks Related to Our Organization and Structure

Conflicts of interest exist with holders of interests in BPLP. 

Sales of properties and repayment of related indebtedness will have different effects on holders of interests in BPLP than on BXP’s stockholders. 

Some holders of interests in BPLP could incur adverse tax consequences upon the sale of certain of our properties and on the repayment of related debt which differ from the tax consequences to BXP and its stockholders. Consequently, such holders of partnership interests in BPLP may have different objectives regarding the appropriate pricing and timing of any such sale or repayment of debt. While BXP has exclusive authority under the limited partnership agreement of BPLP to determine when to refinance or repay debt or whether, when, and on what terms to sell a property, subject, in the case of certain properties, to the contractual commitments described below, any such decision would require the approval of BXP’s Board of Directors. While the Board of Directors has a policy with respect to these matters directors and executive officers could exercise their influence in a manner inconsistent with the interests of some, or a majority, of BXP’s stockholders, including in a manner which could prevent completion of a sale of a property or the repayment of indebtedness.

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Agreement not to sell some properties. 

We have had and may have in the future agreements with the contributors of properties that we have acquired in exchange for partnership interests in BPLP pursuant to which we have agreed not to sell or otherwise transfer the properties, prior to specified dates, in any transaction that would trigger taxable income to the contributors. In addition, we are responsible for the reimbursement of certain tax-related costs to the prior owners if the subject properties are sold in a taxable sale. In general, our obligations to the prior owners are limited in time and only apply to actual damages suffered.

Also, BPLP has had and may have in the future agreements providing prior owners of properties with the right to guarantee specific amounts of indebtedness and, in the event that the specific indebtedness they guarantee is repaid or reduced, additional and/or substitute indebtedness. These agreements may hinder actions that BPLP may otherwise desire to take to repay or refinance guaranteed indebtedness because doing so would require BPLP to make payments to the prior owners if BPLP violates these agreements.

Limits on changes in control may discourage takeover attempts beneficial to stockholders. 

Provisions in BXP’s charter and bylaws, BXP’s shareholder rights agreement and the limited partnership agreement of BPLP, as well as provisions of the Code and Delaware corporate law, may: 

•delay or prevent a change of control over BXP or a tender offer, even if such action might be beneficial to BXP’s stockholders; and

•limit BXP’s stockholders’ opportunity to receive a potential premium for their shares of common stock over then-prevailing market prices.

Stock Ownership Limit 

To facilitate maintenance of BXP’s qualification as a REIT and to otherwise address concerns relating to concentration of stock ownership, BXP’s charter generally prohibits ownership, directly, indirectly or beneficially, by any single stockholder of more than 6.6% of the number of outstanding shares of any class or series of its common stock. We refer to this limitation as the “ownership limit.” BXP’s Board of Directors may waive, in its sole discretion, or modify the ownership limit with respect to one or more persons if it is satisfied that ownership in excess of this limit will not jeopardize BXP’s status as a REIT for federal income tax purposes. In addition, under BXP’s charter, each of Mortimer B. Zuckerman and the respective families and affiliates of Mortimer B. Zuckerman and Edward H. Linde, as well as, in general, pension plans and mutual funds, may actually and beneficially own up to 15% of the number of outstanding shares of any class or series of BXP’s equity common stock. Shares owned in violation of the ownership limit will be subject to the loss of rights to distributions and voting and other penalties. The ownership limit may have the effect of inhibiting or impeding a change in control. 

BPLP’s Partnership Agreement 

BXP has agreed in the limited partnership agreement of BPLP not to engage in specified extraordinary transactions, including, among others, business combinations, unless limited partners of BPLP other than BXP receive, or have the opportunity to receive, either (1) the same consideration for their partnership interests as holders of BXP common stock in the transaction or (2) limited partnership units that, among other things, would entitle the holders, upon redemption of these units, to receive shares of common equity of a publicly traded company or the same consideration as holders of BXP common stock received in the transaction. If these limited partners would not receive such consideration, we cannot engage in the transaction unless limited partners holding at least 75% of the common units of limited partnership interest, other than those held by BXP or its affiliates, consent to the transaction. In addition, BXP has agreed in the limited partnership agreement of BPLP that it will not complete specified extraordinary transactions, including among others, business combinations, in which BXP receive the approval of its common stockholders unless (1) limited partners holding at least 75% of the common units of limited partnership interest, other than those held by BXP or its affiliates, consent to the transaction or (2) the limited partners of BPLP are also allowed to vote and the transaction would have been approved had these limited partners been able to vote as common stockholders on the transaction. Therefore, if BXP’s common stockholders approve a specified extraordinary transaction, the partnership agreement requires the following before it can complete the transaction: 

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•holders of partnership interests in BPLP, including BXP, must vote on the matter;

•BXP must vote its partnership interests in the same proportion as its stockholders voted on the transaction; and

•the result of the vote of holders of partnership interests in BPLP must be such that had such vote been a vote of stockholders, the business combination would have been approved.

With respect to specified extraordinary transactions, BXP has agreed in BPLP’s partnership agreement to use its commercially reasonable efforts to structure such a transaction to avoid causing its limited partners to recognize gain for federal income tax purposes by virtue of the occurrence of or their participation in such a transaction.

As a result of these provisions, a potential acquirer may be deterred from making an acquisition proposal, and BXP may be prohibited by contract from engaging in a proposed extraordinary transaction, including a proposed business combination, even though BXP stockholders approve of the transaction. 

We may change our policies without obtaining the approval of our stockholders. 

Our operating and financial policies, including our policies with respect to acquisitions of real estate, growth, operations, indebtedness, capitalization and dividends, are exclusively determined by BXP’s Board of Directors. Accordingly, our securityholders do not control these policies.

Risks Related to BXP’s Status as a REIT

Failure to qualify as a REIT would cause BXP to be taxed as a corporation, which would substantially reduce funds available for payment of dividends. 

If BXP fails to qualify as a REIT for federal income tax purposes, it will be taxed as a corporation unless certain relief provisions apply. We believe that BXP is organized and qualified as a REIT and intends to operate in a manner that will allow BXP to continue to qualify as a REIT. However, we cannot assure you that BXP is qualified as such, or that it will remain qualified as such in the future. This is because qualification as a REIT involves the application of highly technical and complex provisions of the Code as to which there are only limited judicial and administrative interpretations and involves the determination of facts and circumstances not entirely within our control. Future legislation, new regulations, administrative interpretations or court decisions may significantly change the tax laws or the application of the tax laws with respect to qualification as a REIT for federal income tax purposes or the federal income tax consequences of such qualification. 

In addition, we currently hold certain of our properties through subsidiaries that have elected to be taxed as REITs and we may in the future determine that it is in our best interests to hold one or more of our other properties through one or more subsidiaries that elect to be taxed as REITs. If any of these subsidiaries fails to qualify as a REIT for federal income tax purposes, then BXP may also fail to qualify as a REIT for federal income tax purposes. 

If BXP or any of its subsidiaries that are REITs fails to qualify as a REIT then, unless certain relief provisions apply, it will face serious tax consequences that will substantially reduce the funds available for payment of dividends for each of the years involved because: 

•BXP would not be allowed a deduction for dividends paid to stockholders in computing its taxable income and would be subject to federal income tax at regular corporate rates;

•BXP also could be subject to the federal alternative minimum tax for tax years ending before January 1, 2018 and possibly increased state and local taxes; and

•unless BXP is entitled to relief under statutory provisions, BXP could not elect to be subject to tax as a REIT for four taxable years following the year during which it was disqualified.

In addition, if BXP fails to qualify as a REIT and the relief provisions do not apply, it will no longer be required to pay dividends. As a result of all these factors, BXP’s failure to qualify as a REIT could impair our ability to raise capital and expand our business, and it would adversely affect the value of BXP’s common stock. If BXP or any of its subsidiaries that are REITs fails to qualify as a REIT but is eligible for certain relief provisions, then it may retain its status as a REIT, but may be required to pay a penalty tax, which could be substantial. 

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In order to maintain BXP’s REIT status, we may be forced to borrow funds during unfavorable market conditions. 

In order to maintain BXP’s REIT status, we may need to borrow funds on a short-term basis to meet the REIT distribution requirements, even if the then-prevailing market conditions are not favorable for these borrowings. To qualify as a REIT, BXP generally must distribute to its stockholders at least 90% of its taxable income each year, excluding capital gains and with certain other adjustments. In addition, BXP will be subject to a 4% nondeductible excise tax on the amount, if any, by which dividends paid in any calendar year are less than the sum of 85% of ordinary income, 95% of capital gain net income and 100% of undistributed income from prior years. We may need short-term debt or long-term debt or proceeds from asset sales, creation of joint ventures or sales of common stock to fund required distributions as a result of differences in timing between the actual receipt of income and the recognition of income for federal income tax purposes, or the effect of non-deductible capital expenditures, the creation of reserves or required debt or amortization payments. Any inability of our cash flows to cover our distribution requirements could have an adverse impact on our ability to raise short- and long-term debt or sell equity securities in order to fund distributions required to maintain BXP’s REIT status. 

We may be subject to adverse legislative or regulatory tax changes that could negatively impact our financial condition.

At any time, the U.S. federal income tax laws governing REITs or the administrative interpretations of those laws may be amended, including with respect to our hotel ownership structure. We cannot predict if or when any new U.S. federal income tax law, regulation, or administrative interpretation, or any amendment to any existing U.S. federal income tax law, Treasury regulation or administrative interpretation, will be adopted, promulgated or become effective and any such law, regulation, or interpretation may take effect retroactively. BXP, its taxable REIT subsidiaries, and our securityholders could be adversely affected by any such change in, or any new, U.S. federal income tax law, Treasury regulation or administrative interpretation.

We face possible adverse state and local tax audits and changes in state and local tax laws.

Because BXP is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but we are subject to certain state and local taxes. In the normal course of business, certain entities through which we own real estate either have undergone, or are currently undergoing, tax audits. Although we believe that we have substantial arguments in favor of our positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on our results of operations.

From time to time changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax liability. A shortfall in tax revenues for states and municipalities in which we operate may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income. These increased tax costs could adversely affect our financial condition and results of operations and the amount of cash available for the payment of dividends and distributions to our securityholders. 

General Risk Factors

Changes in market conditions could adversely affect the market price of BXP’s common stock. 

As with other publicly traded equity securities, the value of BXP’s common stock depends on various market conditions that may change from time to time. Among the market conditions that may affect the value of BXP’s common stock are the following: 

•the extent of investor interest in our securities;

•the general reputation of REITs and the attractiveness of our equity securities in comparison to other equity securities, including securities issued by other real estate-based companies;

•our underlying asset value;

•investor confidence in the stock and bond markets, generally;

•national economic conditions;

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•changes in tax laws;

•our financial performance;

•changes in our credit ratings;

•differences between the yields paid on other investments available in the market and BXP’s dividend yield; and

•general stock and bond market conditions, including changes in interest rates.

The market value of BXP’s common stock is based primarily upon the market’s perception of our growth potential and our current and potential future earnings and cash dividends. Consequently, BXP’s common stock may trade at prices that are greater or less than BXP’s net asset value per share of common stock. If our future earnings or cash dividends are less than expected, it is likely that the market price of BXP’s common stock will diminish. 

Further issuances of equity securities may be dilutive to current securityholders. 

The interests of our existing securityholders could be diluted if additional equity securities are issued to finance future developments, acquisitions or repay indebtedness. Our ability to execute our business strategy depends on our access to an appropriate blend of debt financing, including unsecured lines of credit and other forms of secured and unsecured debt, and equity financing, including common and preferred equity.

The number of shares available for future sale could adversely affect the market price of BXP’s stock. 

In connection with and subsequent to BXP’s initial public offering, we have completed many private placement transactions in which shares of stock of BXP or partnership interests in BPLP were issued to owners of properties we acquired or to institutional investors. This common stock, or common stock issuable in exchange for such partnership interests in BPLP, may be sold in the public securities markets over time under registration rights we granted to these investors. Additional common stock issuable under our employee benefit and other incentive plans, including as a result of the grant of stock options and restricted equity securities, may also be sold in the market at some time in the future. Future sales of BXP common stock in the market could adversely affect the price of its common stock. We cannot predict the effect the perception in the market that such sales may occur will have on the market price of BXP’s common stock. 

Our involvement in legal proceedings and other claims may result in substantial monetary and other costs that have a material adverse effect on our results of operations.

From time to time, we are involved in legal proceedings and other claims. We may also be named as defendants in lawsuits allegedly arising out of our actions or the actions of our vendors, contractors, clients or other contractual parties in which such parties have agreed to indemnify, defend and hold us harmless from and against various claims, litigation and liabilities arising in connection with their respective businesses and/or added as an additional insured under certain insurance policies. An unfavorable resolution of any legal proceeding or other claim could have a material adverse effect on our financial condition or results from operations. Regardless of its outcome, legal proceedings and other claims may result in substantial costs and expenses and significantly divert the attention of our management. With respect to any legal proceeding or other claim, there can be no assurance that we will be able to prevail, or achieve a favorable settlement or outcome, or that our insurance or the insurance and/or any contractual indemnities of our vendors, contractors, clients or other contractual parties will be enough to cover all of our defense costs or any resulting liabilities.

We face risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems.

We face risks associated with security breaches, whether through cyber attacks or cyber intrusions over the internet, malware, computer viruses, attachments to e-mails, persons inside our organization or persons with access to systems inside our organization, and other significant disruptions of our IT networks and related systems. The risk of a security breach or disruption, particularly through cyber attack or cyber intrusion, including by computer hackers, foreign governments and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. Our IT networks and related systems are essential to the operation of our business and our ability to perform day-to-day operations (including managing our building systems) and, in some cases, may be critical to the operations of certain of our clients.

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The Audit Committee of BXP’s Board of Directors oversees our risk management processes related to cybersecurity. It meets no less frequently than annually with our IT personnel and senior management to discuss recent trends in cyber risks and our strategy to defend our IT networks, business systems and information against cyber attacks and intrusions. Under the oversight of the Audit Committee, we established our overall cybersecurity program and its standards by reference to the National Institute of Standards and Technology (“NIST”) Cyber Security Framework. As part of our overall cybersecurity program:

•we have implemented a continuous improvement methodology including, but not limited to, ongoing enhancements to processes and controls, quarterly control reviews, annual policy reviews, biannual penetration tests and annual investments in our security infrastructure;

•we annually assess our cybersecurity program against the NIST framework and periodically engage an outside consulting firm to conduct the assessment; and

•we conduct cybersecurity awareness training at least three times per year for our employees and primary on-site providers, and we conduct ongoing phishing simulations to raise awareness of spoofed or manipulated electronic communications and other critical security threats.

Although we make efforts to maintain the security and integrity of our IT networks and related systems, and we have implemented various measures to manage the risk of a security breach or disruption, there can be no assurance that our security efforts and measures will be effective or that attempted security breaches or disruptions would not be successful or damaging. Even the most well-protected information, networks, systems and facilities remain potentially vulnerable because the techniques used in such attempted security breaches evolve and generally are not recognized until launched against a target, and in some cases, are designed not be detected and, in fact, may not be detected. Accordingly, we may be unable to anticipate these techniques or to implement adequate security barriers or other preventative measures, and thus it is impossible for us to entirely mitigate this risk.

Like other businesses, we have been, and expect to continue to be, subject to attempts at unauthorized access, mishandling or misuse, computer viruses or malware, cyber attacks and intrusions and other events of varying degrees. To date, these events have not adversely affected our operations or business and have not been material, either individually or in the aggregate. However, a security breach or other significant disruption involving our IT networks and related systems could:

•disrupt the proper functioning of our networks and systems and therefore our operations and/or those of certain of our clients;

•result in misstated financial reports, violations of loan covenants, missed reporting deadlines and/or missed permitting deadlines;

•result in our inability to properly monitor our compliance with the rules and regulations regarding BXP’s qualification as a REIT;

•result in the unauthorized access to, and destruction, loss, theft, misappropriation or release of, proprietary, confidential, sensitive or otherwise valuable information of ours or others, which others could use to compete against us or which could expose us to damage claims by third-parties for disruptive, destructive or otherwise harmful purposes and outcomes;

•result in our inability to maintain the building systems relied upon by our clients for the efficient use of their leased space;

•require significant management attention and resources to remedy any damages that result;

•subject us to claims for breach of contract, damages, credits, penalties or termination of leases or other agreements; and

•damage our reputation among our clients and investors generally.

Any one or more of the foregoing could have a material adverse effect on our results of operations, financial condition and cash flows.

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Changes in accounting pronouncements could adversely affect our operating results, in addition to the reported financial performance of our clients. 

Accounting policies and methods are fundamental to how we record and report our financial condition and results of operations. Uncertainties posed by various initiatives of accounting standard-setting by the Financial Accounting Standards Board and the Securities and Exchange Commission, which create and interpret applicable accounting standards for U.S. companies, may change the financial accounting and reporting standards or their interpretation and application of these standards that govern the preparation of our financial statements. Changes include, but are not limited to, changes in revenue recognition, lease accounting and the adoption of accounting standards likely to require the increased use of “fair-value” measures. 

These changes could have a material impact on our reported financial condition and results of operations. In some cases, we could be required to apply a new or revised standard retroactively, resulting in potentially material restatements of prior period financial statements. Similarly, these changes could have a material impact on our clients’ reported financial condition or results of operations or could affect our clients’ preferences regarding leasing real estate. 

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

At December 31, 2022, we owned or had joint venture interests in 194 commercial real estate properties, aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.2 million net rentable square feet. Our properties consisted of (1) 173 office and life sciences properties (including 10 properties under construction/redevelopment), (2) 14 retail properties (including two properties under construction/redevelopment), (3) six residential properties (including one property under construction) and (4) one hotel. The table set forth below shows information relating to the properties we owned, or in which we had an ownership interest, at December 31, 2022, and it includes properties held by both consolidated and unconsolidated joint ventures.

Properties	Location	% Leased as of December 31, 2022 (1)		Number of Buildings	Net Rentable Square Feet
Office and Life Sciences
767 Fifth Avenue (The GM Building) (60% ownership)	New York, NY	86.6	%	1	1,965,003
200 Clarendon Street	Boston, MA	95.0	%	1	1,769,077
601 Lexington Avenue (55% ownership)	New York, NY	98.9	%	1	1,670,790
399 Park Avenue	New York, NY	99.2	%	1	1,577,544
Salesforce Tower	San Francisco, CA	100.0	%	1	1,420,682
100 Federal Street (55% ownership)	Boston, MA	89.8	%	1	1,238,821
Times Square Tower (55% ownership)	New York, NY	84.8	%	1	1,225,472
800 Boylston Street - The Prudential Center	Boston, MA	91.7	%	1	1,197,798
Colorado Center (50% ownership) (2)	Santa Monica, CA	89.5	%	6	1,131,511
Santa Monica Business Park (55% ownership) (2)	Santa Monica, CA	87.1	%	14	1,106,399
599 Lexington Avenue	New York, NY	85.4	%	1	1,106,351
Reston Next	Reston, VA	69.4	%	2	1,063,236
Bay Colony Corporate Center	Waltham, MA	62.8	%	4	989,548
250 West 55th Street	New York, NY	99.4	%	1	966,979
Embarcadero Center Four	San Francisco, CA	93.7	%	1	941,205

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Properties	Location	% Leased as of December 31, 2022 (1)		Number of Buildings	Net Rentable Square Feet
111 Huntington Avenue - The Prudential Center	Boston, MA	95.2	%	1	860,446
200 Fifth Avenue (26.69% ownership) (2)	New York, NY	92.5	%	1	854,737
Embarcadero Center One	San Francisco, CA	68.4	%	1	837,309
Embarcadero Center Two	San Francisco, CA	86.3	%	1	802,472
Atlantic Wharf Office (55% ownership)	Boston, MA	99.8	%	1	793,769
Gateway Commons (50% Ownership) (2)	South San Francisco, CA	89.7	%	5	787,846
Embarcadero Center Three	San Francisco, CA	82.5	%	1	787,377
Safeco Plaza (33.67% ownership) (2)	Seattle, WA	83.6	%	1	778,116
Madison Centre	Seattle, WA	93.1	%	1	754,988
7750 Wisconsin Avenue (50% ownership) (2)	Bethesda, MD	100.0	%	1	735,573
Dock 72 (50% ownership) (2)	Brooklyn, NY	25.5	%	1	668,625
Metropolitan Square (20% ownership) (2)	Washington, DC	85.7	%	1	657,580
100 Causeway Street (50% ownership) (2)	Boston, MA	94.6	%	1	633,819
South of Market	Reston, VA	99.6	%	3	623,250
901 New York Avenue (25% ownership) (2)	Washington, DC	83.1	%	1	544,256
Mountain View Research Park	Mountain View, CA	79.2	%	15	542,264
Reservoir Place	Waltham, MA	58.0	%	1	527,029
680 Folsom Street	San Francisco, CA	98.7	%	2	524,793
Fountain Square	Reston, VA	89.7	%	2	524,785
101 Huntington Avenue - The Prudential Center	Boston, MA	99.2	%	1	506,476
145 Broadway	Cambridge, MA	99.6	%	1	490,086
2200 Pennsylvania Avenue	Washington, DC	93.6	%	1	459,745
One Freedom Square	Reston, VA	85.0	%	1	427,956
Two Freedom Square	Reston, VA	100.0	%	1	423,222
Market Square North (50% ownership) (2)	Washington, DC	75.3	%	1	418,539
325 Main Street	Cambridge, MA	91.6	%	1	414,008
The Hub on Causeway - Podium (50% ownership) (2)	Boston, MA	75.3	%	1	382,497
One and Two Discovery Square	Reston, VA	99.0	%	2	366,989
888 Boylston Street - The Prudential Center	Boston, MA	100.0	%	1	363,320
Weston Corporate Center	Weston, MA	100.0	%	1	356,995
510 Madison Avenue	New York, NY	97.1	%	1	355,089
One Reston Overlook	Reston, VA	89.0	%	1	319,519
535 Mission Street	San Francisco, CA	87.6	%	1	307,235
140 Kendrick Street (3)	Needham, MA	85.9	%	2	306,323
Waltham Weston Corporate Center	Waltham, MA	97.1	%	1	301,611
Wisconsin Place Office	Chevy Chase, MD	88.9	%	1	299,428
230 CityPoint	Waltham, MA	97.4	%	1	296,720
17Fifty Presidents Street	Reston, VA	100.0	%	1	275,809

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Properties	Location	% Leased as of December 31, 2022 (1)		Number of Buildings	Net Rentable Square Feet
200 West Street	Waltham, MA	83.9	%	1	273,365
125 Broadway	Cambridge, MA	100.0	%	1	271,000
Reston Corporate Center	Reston, VA	100.0	%	2	261,046
355 Main Street	Cambridge, MA	99.3	%	1	259,640
Democracy Tower	Reston, VA	99.3	%	1	259,441
1330 Connecticut Avenue	Washington, DC	94.6	%	1	253,579
880 Winter Street	Waltham, MA	85.4	%	1	243,618
10 CityPoint	Waltham, MA	95.8	%	1	236,570
510 Carnegie Center	Princeton, NJ	33.5	%	1	234,160
500 North Capitol Street, N.W. (30% ownership) (2)	Washington, DC	98.5	%	1	230,900
90 Broadway	Cambridge, MA	98.1	%	1	223,771
255 Main Street	Cambridge, MA	97.5	%	1	215,394
20 CityPoint	Waltham, MA	98.9	%	1	211,476
77 CityPoint	Waltham, MA	98.3	%	1	209,711
Sumner Square	Washington, DC	98.1	%	1	209,556
University Place	Cambridge, MA	100.0	%	1	195,282
300 Binney Street (4)	Cambridge, MA	64.2	%	1	195,191
North First Business Park (5)	San Jose, CA	87.6	%	5	190,636
Shady Grove Innovation District (6)	Rockville, MD	75.1	%	3	182,290
890 Winter Street	Waltham, MA	54.0	%	1	179,312
150 Broadway	Cambridge, MA	100.0	%	1	177,226
Capital Gallery	Washington, DC	97.1	%	1	176,809
Lexington Office Park (5)	Lexington, MA	43.0	%	2	166,779
206 Carnegie Center	Princeton, NJ	100.0	%	1	161,763
210 Carnegie Center	Princeton, NJ	79.2	%	1	159,468
Kingstowne Two	Alexandria, VA	83.7	%	1	156,005
Kingstowne One	Alexandria, VA	36.9	%	1	153,401
105 Broadway	Cambridge, MA	100.0	%	1	152,664
212 Carnegie Center	Princeton, NJ	40.1	%	1	147,530
214 Carnegie Center	Princeton, NJ	65.9	%	1	146,799
2440 West El Camino Real	Mountain View, CA	100.0	%	1	142,789
506 Carnegie Center	Princeton, NJ	68.2	%	1	139,050
153 & 211 Second Avenue	Waltham, MA	100.0	%	2	136,882
Two Reston Overlook	Reston, VA	100.0	%	1	134,615
508 Carnegie Center	Princeton, NJ	100.0	%	1	134,433
202 Carnegie Center	Princeton, NJ	87.0	%	1	134,068
804 Carnegie Center	Princeton, NJ	100.0	%	1	130,000
504 Carnegie Center	Princeton, NJ	100.0	%	1	121,990
101 Carnegie Center	Princeton, NJ	95.3	%	1	121,619
502 Carnegie Center	Princeton, NJ	96.2	%	1	121,460
1265 Main Street (50% ownership) (2)	Waltham, MA	100.0	%	1	120,681
701 Carnegie Center	Princeton, NJ	100.0	%	1	120,000
104 Carnegie Center	Princeton, NJ	75.2	%	1	102,930
103 Carnegie Center	Princeton, NJ	78.6	%	1	96,331
33 Hayden Avenue	Lexington, MA	100.0	%	1	80,876

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Properties	Location	% Leased as of December 31, 2022 (1)			Number of Buildings	Net Rentable Square Feet
Reservoir Place North	Waltham, MA	100.0	%		1	73,258
32 Hartwell Avenue	Lexington, MA	100.0	%		1	69,154
250 Binney Street	Cambridge, MA	100.0	%		1	67,362
302 Carnegie Center	Princeton, NJ	100.0	%		1	64,926
100 Hayden Avenue	Lexington, MA	100.0	%		1	55,924
211 Carnegie Center	Princeton, NJ	100.0	%		1	47,025
92 Hayden Avenue	Lexington, MA	100.0	%		1	31,100
17 Hartwell Avenue	Lexington, MA	100.0	%		1	30,000
453 Ravendale Drive	Mountain View, CA	75.0	%		1	29,620
690 Folsom Street	San Francisco, CA	100.0	%		1	26,080
201 Carnegie Center	Princeton, NJ	100.0	%		—	6,500
Subtotal for Office and Life Sciences Properties		88.5	%		163	48,154,072
Retail
Prudential Center (retail shops) (3)	Boston, MA	95.9	%		—	475,899
Fountain Square Retail	Reston, VA	83.2	%		1	198,158
Kingstowne Retail	Alexandria, VA	96.8	%		1	88,288
Santa Monica Business Park Retail (55% ownership) (2)	Santa Monica, CA	90.1	%		7	74,404
Star Market at the Prudential Center	Boston, MA	100.0	%		1	57,236
Avant Retail	Reston, VA	100.0	%		1	26,179
The Point	Waltham, MA	100.0	%		1	16,300
Subtotal for Retail Properties		93.3	%		12	936,464
Residential
Signature at Reston (508 units)	Reston, VA	93.7	%		1	517,783
The Skylyne (402 units)	Oakland, CA	90.3	%		1	330,996
Hub50House (440 units) (50% ownership) (2)	Boston, MA	94.6	%		1	320,444
Proto Kendall Square (280 units)	Cambridge, MA	94.6	%		1	166,717
The Lofts at Atlantic Wharf (86 units)	Boston, MA	97.7	%		1	87,096
Subtotal for Residential Properties		93.5	%	(7)	5	1,423,036	(8)
Hotel
Boston Marriott Cambridge (437 rooms)	Cambridge, MA	64.6	%	(9)	1	334,260	(10)
Subtotal for Hotel Property		64.6	%		1	334,260
Subtotal for In-Service Properties		88.6	%		181	50,847,832
Properties Under Construction/Redevelopment (11)
Office
140 Kendrick Street - Building A	Needham, MA	100.0	%		1	104,000
2100 Pennsylvania Avenue	Washington, DC	84.0	%		1	480,000	(12)
360 Park Avenue South (redevelopment) (42.21% ownership) (2)	New York, NY	—	%		1	450,000
Reston Next Office Phase II	Reston, VA	—	%		1	90,000
Platform16 Building A (55% ownership) (2)	San Jose, CA	—	%		1	389,500

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Properties	Location	% Leased as of December 31, 2022 (1)			Number of Buildings	Net Rentable Square Feet
Laboratory/Life Sciences
751 Gateway (49% ownership) (2)	South San Francisco, CA	100.0	%		1	231,000
103 CityPoint	Waltham, MA	—	%		1	113,000
190 CityPoint (formerly 180 CityPoint)	Waltham, MA	43.0	%		1	329,000
105 Carnegie Center	Princeton, NJ	—	%		1	73,000
651 Gateway (50% ownership) (Redevelopment) (2)	South San Francisco, CA	7.0	%		1	327,000
Residential
Reston Next Residential (508 units) (20% ownership) (2)	Reston, VA	—	%		1	417,000
Retail
760 Boylston Street (Redevelopment)	Boston, MA	100.0	%		1	118,000
Reston Next Retail	Reston, VA	—	%		1	33,000
Other
View Boston Observatory at The Prudential Center (Redevelopment)	Boston, MA	N/A			—	59,000
Subtotal for Properties Under Construction/Redevelopment		37.0	%	(13)	13	3,213,500
Total Portfolio					194	54,061,332

_______________

(1)Represents signed leases for in-service properties for which revenue recognition has commenced in accordance with accounting principles generally accepted in the United States (“GAAP”).

(2)Property is an unconsolidated joint venture.

(3)Excludes a portion of the property that was placed in redevelopment during the year for 760 Boylston Street, the stand-alone building consisting of approximately 118,000 square feet at the Prudential Center (retail shops), and for 140 Kendrick Street one building consisting of approximately 90,000 square feet.

(4)This property is held for redevelopment (see Note 16 to the Consolidated Financial Statements).

(5)Property is held for redevelopment.

(6)Excludes 2096 Gaither Road, which was taken out of service following the expiration of the last leases on November 30, 2022. 2096 Gaither Road consisted of approximately 50,000 net rentable square feet of office space. The property is held for future redevelopment.

(7)Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2022.

(8)Includes 61,511 square feet of retail space that is approximately 46.7% leased as of December 31, 2022. This amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2022.

(9)Represents the weighted-average room occupancy for the year ended December 31, 2022. This amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2022.

(10)Includes 4,260 square feet of retail space that is 100% leased as of December 31, 2022. This amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2022.

(11)Represents percentage leased as of February 21, 2023, including leases with future commencement dates.

(12)The property was 64% placed in-service as of December 31, 2022.

(13)Total percentage leased excludes Residential and Other.

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Percentage Leased and Average Annualized Revenue per Square Foot for In-Service Properties 

The following table sets forth our percentage leased and average annualized revenue per square foot on a historical basis for our In-Service Properties. 

	December 31,
	2022		2021		2020		2019		2018
Percentage leased (1)	88.6	%	88.8	%	90.1	%	93.0	%	91.4	%
Average annualized revenue per square foot (2)	$75.99		$73.76		$72.67		$69.72		$66.63

_______________

(1)Represents signed leases, excluding hotel and residential properties, for which revenue recognition has commenced in accordance with GAAP.

(2)Represents the monthly contractual base rents and recoveries from clients under existing leases as of December 31, 2022, 2021, 2020, 2019 and 2018 multiplied by twelve. These annualized amounts are before rent abatements and include expense reimbursements, which may be estimates as of such date. The aggregate amounts of rent abatements per square foot under existing leases as of December 31, 2022, 2021, 2020, 2019 and 2018 for the succeeding twelve-month period were $1.56, $2.15, $1.73, $1.70 and $0.97, respectively.

Top 20 Clients by Square Feet 

Our 20 largest clients by square feet as of December 31, 2022 were as follows:

	Client	Square Feet (1)	% of In-Service Portfolio (1)
1.	salesforce.com	905,742	2.18	%
2.	Biogen	848,021	2.04	%
3.	Google	836,110	2.02	%
4.	Fannie Mae	706,196	1.70	%
5.	Microsoft	676,013	1.63	%
6.	Akamai Technologies	658,578	1.59	%
7.	Ropes & Gray	539,467	1.30	%
8.	WeWork	499,584	1.20	%
9.	Kirkland & Ellis	409,828	0.99	%
10.	Shearman & Sterling	384,813	0.93	%
11.	Integrated Holding Group	373,007	0.90	%
12.	Arnold & Porter Kaye Scholer	367,878	0.89	%
13.	Marriott	367,787	0.89	%
14.	Leidos	352,394	0.85	%
15.	Blue Cross Blue Shield	347,618	0.84	%
16.	Snap	334,008	0.81	%
17.	Wellington Management	329,284	0.79	%
18.	Bank of America	327,965	0.79	%
19.	US Government	319,359	0.77	%
20.	Mass Financial Services	313,584	0.76	%

__________________

(1)Amounts are calculated based on our consolidated portfolio square feet, plus our share of the square feet from the unconsolidated joint ventures properties (calculated based on our ownership percentage), minus our partners’ share of square feet from our consolidated joint venture properties (calculated based upon the partners’ percentage ownership interests).

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Client Diversification

Our client diversification by square feet as of December 31, 2022 was as follows:

Sector	% of In-Service Portfolio
Technology & Media	22.3%
Legal Services	17.2%
Financial Services - all other	13.3%
Real Estate & Insurance	9.6%
Life Sciences	8.6%
Other Professional Services	7.9%
Financial Services - commercial & investment banking	5.8%
Retail	5.5%
Manufacturing	4.2%
Government / Public Administration	2.9%
Other	2.7%

Lease Expirations (1)(2)

Year of Lease Expiration	Rentable Square Feet Subject to Expiring Leases	Current Annualized Contractual Rent Under Expiring Leases Without Future Step-Ups (3)	Current Annualized Contractual Rent Under Expiring Leases Without Future Step-Ups p.s.f. (3)	Current Annualized Contractual Rent Under Expiring Leases With Future Step-Ups (4)	Current Annualized Contractual Rent Under Expiring Leases With Future Step-Ups p.s.f. (4)	Percentage of Total Square Feet
2022 (5)	142,247	$8,743,332	$61.47	$8,743,332	$61.47	0.29	%
2023	2,365,271	152,468,240	64.46	154,165,416	65.18	4.81	%
2024	3,484,836	226,746,710	65.07	229,909,224	65.97	7.09	%
2025	3,153,702	223,623,625	70.91	229,978,559	72.92	6.42	%
2026	3,426,819	282,354,792	82.40	300,195,296	87.60	6.97	%
2027	2,536,189	189,932,694	74.89	206,165,952	81.29	5.16	%
2028	3,613,441	284,362,730	78.70	313,274,083	86.70	7.35	%
2029	3,277,617	244,843,567	74.70	280,496,001	85.58	6.67	%
2030	2,942,040	221,302,292	75.22	244,517,304	83.11	5.99	%
2031	2,050,808	162,883,453	79.42	183,351,730	89.40	4.17	%
Thereafter	16,199,507	1,311,792,619	80.98	1,606,093,642	99.14	32.96	%

 _______________

(1)Includes 100% of unconsolidated joint venture properties. Does not include residential units or the hotel.

(2)Does not include data for leases expiring in a particular year when leases for the same space have already been signed with replacement clients with future commencement dates. In those cases, the data is included in the year in which the future lease with the replacement client expires.

(3)Represents the monthly contractual base rent and recoveries from clients under existing leases as of December 31, 2022 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

(4)Represents the monthly contractual base rent under expiring leases with future contractual increases upon expiration and recoveries from clients under existing leases as of December 31, 2022 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

(5)Represents leases that expired on December 31, 2022.

Item 3. Legal Proceedings.

We are subject to various legal proceedings and claims that arise in the ordinary course of business. Many of these matters are covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on our financial position, results of operations or liquidity.

Item 4. Mine Safety Disclosures.

Not Applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

The common stock of Boston Properties, Inc. is listed on the New York Stock Exchange under the symbol “BXP.” At February 21, 2023, BXP had approximately 1,055 stockholders of record. 

There is no established public trading market for BPLP’s common units. On February 21, 2023, there were approximately 329 holders of record and 175,485,410 common units outstanding, 156,822,702 of which were held by BXP.

In order to enable BXP to maintain its qualification as a REIT, it must make annual distributions to its stockholders of at least 90% of its taxable income (not including net capital gains and with certain other adjustments). BXP has adopted a policy of paying regular quarterly dividends on its common stock, and, as BPLP’s general partner, BXP has adopted a policy of paying regular quarterly distributions on common units of BPLP.

Cash distributions have been paid on the common stock of BXP and BPLP’s common units since BXP’s initial public offering. Distributions are declared at the discretion of the Board of Directors of BXP and depend on actual and anticipated cash from operations, our financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Code and other factors the Board of Directors of BXP may consider relevant.

Stock Performance Graph 

The following graph provides a comparison of cumulative total stockholder return for the period from December 31, 2017 through December 31, 2022, among BXP, Standard & Poor’s (“S&P”) 500 Index, FTSE Nareit Equity REIT Total Return Index (the “Equity REIT Index”) and the FTSE Nareit Office REIT Index (the “Office REIT Index”). The Equity REIT Index includes all tax-qualified equity REITs listed on the New York Stock Exchange, the American Stock Exchange and the Nasdaq Stock Market. Equity REITs are defined as those with 75% or more of their gross invested book value of assets invested directly or indirectly in the equity ownership of real estate. The Office REIT Index includes all office REITs included in the Equity REIT Index. Data for BXP, the S&P 500 Index, the Equity REIT Index and the Office REIT Index was provided to us by Nareit. Upon written request, we will provide any stockholder with a list of the REITs included in the Equity REIT Index and the Office REIT Index. The stock performance graph assumes an investment of $100 in each of BXP and the three indices, and the reinvestment of any dividends. The historical information set forth below is not necessarily indicative of future performance. The data shown is based on the share prices or index values, as applicable, at the end of each month shown.

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	As of the year ended December 31,
	2017		2018		2019		2020		2021		2022
Boston Properties, Inc.	$	100.00	$	89.12	$	112.36	$	80.50	$	101.60	$	62.40
S&P 500 Index	$	100.00	$	95.62	$	125.72	$	148.85	$	191.58	$	156.88
Equity REIT Index	$	100.00	$	95.38	$	120.17	$	110.56	$	158.36	$	119.78
Office REIT Index	$	100.00	$	85.50	$	112.36	$	91.65	$	111.81	$	69.75

 

BXP

(a) None.

(b) Not Applicable.

(c) Issuer Purchases of Equity Securities.

Period	(a) Total Number of Shares of Common Stock Purchased		(b) Average Price Paid per Common Share		(c) Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Shares that May Yet be Purchased
October 1, 2022 – October 31, 2022	—		$	—	N/A	N/A
November 1, 2022 – November 30, 2022	—		—		N/A	N/A
December 1, 2022 – December 31, 2022	845	(1)	0.01		N/A	N/A
Total	845		$	0.01	N/A	N/A

____________________

(1)Includes 845 shares of restricted common stock of BXP repurchased in connection with the termination of an employee’s employment with BXP. Under the terms of the applicable restricted stock award agreements, the shares were repurchased by BXP at a price of $0.01 per share, which was the amount originally paid by such employee for such shares.

BPLP

(a) None.

(b) Not Applicable.

(c) Issuer Purchases of Equity Securities.

Period	(a) Total Number of Units Purchased		(b) Average Price Paid per Unit		(c) Total Number of Units Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Units that May Yet be Purchased
October 1, 2022 – October 31, 2022	—		$	—	N/A	N/A
November 1, 2022 – November 30, 2022	—		—		N/A	N/A
December 1, 2022 – December 31, 2022	2,196	(1)	0.16		N/A	N/A
Total	2,196		$	0.16	N/A	N/A

____________________

(1)Includes 845 common units previously held by BXP that were redeemed in connection with the repurchase of shares of restricted common stock of BXP in connection with the termination of an employee’s employment with BXP and 948 LTIP units, 229 2021 MYLTIP Units and 174 2022 MYLTIP Units that were repurchased by BPLP in connection with the termination of certain employees’ employment with BXP. Under the terms of the applicable restricted stock award agreements, LTIP unit vesting agreements, 2021 MYLTIP award agreement and 2022 MYLTIP award agreement, the shares were repurchased at a price of $0.01 per share and the LTIP units, 2021 MYLTIP units and 2022 MYLTIP units were repurchased at a price of $0.25 per unit, which were the amounts originally paid by such employee for such shares and units.

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Item 6. Reserved

Not applicable.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report.

Forward-Looking Statements

This Annual Report on Form 10-K, including the documents incorporated by reference, contain forward-looking statements within the meaning of the federal securities laws, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and are including this statement for purposes of complying with those safe harbor provisions, in each case, to the extent applicable. The forward-looking statements are contained principally, but not only, under the captions “Business—Business and Growth Strategies,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” We caution investors that forward-looking statements are based on current beliefs, expectations of future events and assumptions made by, and information currently available to, our management. When used, the words “anticipate,” “believe,” “budget,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “project,” “should,” “will” and similar expressions that do not relate solely to historical matters are intended to identify forward-looking statements. These statements are subject to risks, uncertainties and assumptions and are not guarantees of future performance or occurrences, which may be affected by known and unknown risks, trends, uncertainties and factors that are, in some cases, beyond our control. Should one or more of these known or unknown risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those expressed or implied by the forward-looking statements. We caution you that, while forward-looking statements reflect our good-faith beliefs when we make them, they are not guarantees of future performance or occurrences and are impacted by actual events when they occur after we make such statements. Accordingly, investors should use caution in relying on forward-looking statements, which are based on results and trends at the time they are made, to anticipate future results or trends.

The most significant factors that may cause actual results to differ materially from those expressed or implied by the forward-looking statements include the risks and uncertainties related to the impact of changes in general economic and capital market conditions, including continued inflation, increasing interest rates, supply chain disruptions, labor market disruptions, dislocation and volatility in capital markets, and potential longer-term changes in consumer and client behavior resulting from the severity and duration of any downturn in the U.S. or global economy, as well as the other important factors below and the risks set forth in this Form 10-K in Part I, Item 1A.

Some of the risks and uncertainties that may cause our actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements include, among others, the following:

•volatile or adverse global economic and geopolitical conditions, health crises and dislocations in the credit markets could adversely affect our access to cost-effective capital and have a resulting material adverse effect on our business opportunities, results of operations and financial condition;

•risks associated with downturns in the national and local economies, continued inflation, increasing interest rates, and volatility in the securities markets;

•general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, changes in client preferences and space utilization, dependence on clients’ financial condition, and competition from other developers, owners and operators of real estate);

•the impact of geopolitical conflicts, including the ongoing war in Ukraine;

•the immediate and long-term impact of the outbreak of a highly infectious or contagious disease, such as COVID-19, on our and our clients’ financial condition, results of operations and cash flows (including the impact of actions taken to contain the outbreak or mitigate its impact, the direct and indirect economic effects of the outbreak and containment measures on our clients, and the ability of our clients to successfully operate their businesses);

•failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;

•the ability of our joint venture partners to satisfy their obligations;

•risks and uncertainties affecting property development and construction (including, without limitation, continued inflation, supply chain disruptions, labor shortages, construction delays, increased construction costs, cost overruns, inability to obtain necessary permits, client accounting

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considerations that may result in negotiated lease provisions that limit a client’s liability during construction, and public opposition to such activities);

•risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments or refinance existing indebtedness, including the impact of higher interest rates on the cost and/or availability of financing;

•risks associated with forward interest rate contracts and the effectiveness of such arrangements;

•risks associated with actual or threatened terrorist attacks;

•costs of compliance with the Americans with Disabilities Act and other similar laws;

•potential liability for uninsured losses and environmental contamination;

•risks associated with climate change and severe weather events, as well as the regulatory efforts intended to reduce the effects of climate change;

•risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems, which support our operations and our buildings;

•risks associated with BXP’s potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended;

•possible adverse changes in tax and environmental laws;

•the impact of newly adopted accounting principles on our accounting policies and on period-to-period comparisons of financial results;

•risks associated with possible state and local tax audits; and

•risks associated with our dependence on key personnel whose continued service is not guaranteed.

The risks set forth above are not exhaustive. Other sections of this report, including “Part I, Item 1A—Risk Factors,” include additional factors that could adversely affect our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time and it is not possible for management to predict all risk factors, nor can we assess the impact of all risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results. Investors should also refer to our most recent Quarterly Reports on Form 10-Q for future periods and Current Reports on Form 8-K as we file them with the SEC, and to other materials we may furnish to the public from time to time through Current Reports on Form 8-K or otherwise, for a discussion of risks and uncertainties that may cause actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements. We expressly disclaim any responsibility to update any forward-looking statements to reflect changes in underlying assumptions or factors, new information, future events, or otherwise, and you should not rely upon these forward-looking statements after the date of this report.

Overview

BXP is one of the largest publicly traded office real estate investment trusts (REITs) (based on total market capitalization as of December 31, 2022) in the United States that develops, owns, and manages primarily premier workplaces. Our properties are concentrated in six dynamic gateway markets in the United States - Boston, Los Angeles, New York, San Francisco, Seattle, and Washington, DC. BPLP is the entity through which BXP conducts substantially all of its business and owns (either directly or through subsidiaries) substantially all of its assets. We generate revenue and cash primarily by leasing premier workplaces to our clients. When making leasing decisions, we consider, among other things, the creditworthiness of the client and the industry in which it conducts business, the length of the lease, the rental rate to be paid at inception and throughout the lease term, the costs of tenant improvements, free rent periods and other landlord concessions, anticipated operating expenses and real estate taxes, current and anticipated vacancy in our properties and the market overall (including sublease space), current and expected future demand for the space, the impact of other client’s expansion rights and general economic factors.

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Our core strategy has always been to develop, acquire and manage premier workplaces in gateway markets with high barriers-to-entry and attractive demand drivers, and to focus on executing long-term leases with financially strong clients. Our client base is diverse across market sectors and the weighted-average lease term for our in-place leases, excluding residential units, was approximately 7.9 years, as of December 31, 2022, including leases signed by our unconsolidated joint ventures. The weighted-average lease term for our 20 largest clients, based on leased square footage, was approximately 10.7 years as of December 31, 2022.

To be successful in any leasing environment, we believe we must consider all aspects of the client-landlord relationship. In this regard, we believe that our competitive leasing advantage is based on the following attributes:

•our understanding of our client’s short- and long-term space utilization and amenity needs in the local markets;

•our track record of developing and operating premier workplaces in a sustainable and responsible manner;

•our reputation as a high quality developer, owner and manager of premier workplaces in our markets;

•our financial strength and our ability to maintain high building standards; and

•our relationships with local brokers.

Outlook

The inflation experienced in 2022 has slowly decreased but remains high. The Federal Reserve is expected to continue to increase interest rates, although likely at a more moderate pace, in an effort to bring prices under control. This, coupled with the discussion surrounding raising the U.S. debt ceiling could cause further turmoil in the financial markets. There have already been signs of this strain with announcements of staff reductions from large- and medium-sized employers. While the initial announcements were largely concentrated in the technology sectors, companies in the finance industry, the legal industry and broader corporate America are now announcing similar layoffs. This evolving operating environment impacts various aspects of our operating activities as:

•business leaders may generally become more reticent to make large capital allocation decisions, such as entry into a new lease;

•labor market conditions shift resulting in increasing employer demands for mandatory in-person workdays and gradual increases in space utilization by our clients;

•our capital costs have increased due to higher interest rates and credit spreads, and private market debt financing, both for construction and existing assets, is significantly more challenging to arrange; and

•construction costs have increased for new development and, although the costs for our active development pipeline are, at this stage, relatively fixed, the cost of potential future developments continues to increase.

In light of the foregoing, we believe we are positioning ourselves for success, notwithstanding the uncertain trajectory of the U.S. and global economies, by managing our leverage while continuing to selectively invest (including both acquisitions and developments) in premier workplace opportunities. We remain focused on the following priorities:

•continuing to embrace our leadership position in the premier workplace industry and leveraging our strength in portfolio quality, client relationships, development skills, market penetration and sustainability to profitably build market share. Premier workplaces, the preferred choice for our current and prospective clients, are gaining market share compared to general office space and demonstrating the highest occupancy, net absorption levels and rental rates in the central business district (“CBD”) markets where we operate;

•leasing available space in our in-service and development properties, as well as proactively focusing on future lease expirations;

•completing the construction and leasing of our development properties;

•pursuing attractive asset class adjacencies where we have a track record of success, such as life sciences and residential development;

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•continuing to raise the bar in the quality of our portfolio and actively recycling capital by selling assets, subject to market conditions, which may be negatively impacted by a slowdown in the capital markets and the limited availability of private market debt financing;

•actively managing our operations in a sustainable and responsible manner; and

•prioritizing risk management by actively managing liquidity, investing more extensively with joint venture partners to manage our debt levels, and being highly selective in new investment commitments.

The following is an overview of leasing and investment activity in the fourth quarter of 2022.

Leasing Activity and Occupancy

In the fourth quarter of 2022, we signed approximately 1.1 million square feet of new leases and renewals, for a total of approximately 5.7 million square feet leased in 2022, which is 95% of our average annual leasing volume over the last ten years. The leases executed in the fourth quarter and full year 2022 have a weighted-average lease term of approximately 7.8 years and 9.2 years, respectively, indicating that many new and existing clients continue to commit to the long-term use of space and view our properties as their preferred choice for a premier workplace environment.

The overall occupancy of our in-service office and retail properties was 88.6% at December 31, 2022, a decrease of 30 basis points from September 30, 2022. The decrease in occupancy is primarily due to fully placing in-service Reston Next and 880 Winter Street, which have leases for which revenue recognition has not commenced in accordance with GAAP. Excluding the impact of placing these two properties in-service, occupancy would have increased in the fourth quarter of 2022 by 20 basis points to 89.1%.

The macroeconomic environment has resulted in softening demand in all of our markets. While property tours continue and leases under negotiation move forward, there is less urgency from clients to make new commitments. Potential clients touring space acknowledge that economic uncertainty is impacting space decisions. As we consider our expectations for leasing in 2023, we have factored in the impacts of a slower economy, softer business performance, and reduced demand for space. We expect the bulk of our leasing in 2023 will continue to come from small- and medium-sized professional and financial services firms.

Investment Activity

Although the real estate capital markets for office assets has slowed substantially with U.S. transaction volume down 40% in the fourth quarter of 2022 from the third quarter of 2022, we remain committed to developing and acquiring assets to enhance our long-term growth and to meet client demand for premier workplaces, life sciences, retail and residential space. We continually evaluate current and prospective markets for possible acquisitions of “value-add” assets that require lease-up or repositioning, and acquisitions that are otherwise consistent with our long-term strategy of owning, managing, developing, and improving premier workplaces in each of our chosen markets.

Consistent with this strategy, in 2022, we purchased an aggregate of approximately $1.6 billion (our share) of premier workplaces, including life sciences, and an interest in an unconsolidated joint venture that owns a premier workplace. In the fourth quarter of 2022, we acquired a 26.69% interest in the joint venture that owns 200 Fifth Avenue, a 14-story, approximately 855,000 square-foot, LEED Gold certified, premier workplace located in New York City that is approximately 93% leased as of December 31, 2022. The acquisition of the joint venture interest is our second investment in the vibrant Midtown South neighborhood. We serve as the managing member and provide customary leasing and property management services for the joint venture. We closed on the interest in the joint venture for a gross purchase price of approximately $280.2 million, which includes $120.1 million of cash and our pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum and matures on November 24, 2028. The joint venture has interest rate swap contracts through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts.

As of December 31, 2022, our development/redevelopment pipeline consisted of 13 properties that, when completed, we expect will total approximately 3.2 million net rentable square feet. Our share of the estimated total cost for these projects is approximately $1.9 billion, of which approximately $729.1 million remains to be invested. In January 2023, BXP commenced the development of 290 Binney Street and the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts. Including projects that commenced in January 2023, we had 15 properties under development or redevelopment which, excluding View Boston at The Prudential Center and

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Reston Next Residential, are 52% pre-leased as of February 21, 2023. Our share of the estimated total cost for these projects is approximately $3.3 billion.

As we continue to focus on new investments to drive future growth, we regularly review our portfolio to identify properties as potential sales candidates that either no longer fit within our portfolio strategy or could attract premium pricing in the current market. In the fourth quarter of 2022, we completed the disposition of The Avant at Reston Town Center for a gross sale price of $141.0 million. The Avant at Reston Town Center a is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury residential building located in Reston, Virginia. BXP retained ownership of the approximately 26,000 square foot ground-level retail space.

Including the sale of the residential component of The Avant at Reston Town Center, BXP completed the disposition of 14 properties and two land parcels, for an aggregate gross sale price of approximately $864.2 million, in 2022.

A brief overview of each of our markets follows.

Boston

During the fourth quarter of 2022, we executed approximately 287,000 square feet of leases and approximately 476,000 square feet of leases commenced in the Boston region. Approximately 245,000 square feet of the leases that commenced had been vacant for less than one year and represent an increase in net rental obligations of approximately 22% over the prior leases.

Our Boston CBD in-service portfolio was approximately 94% leased as of December 31, 2022.

Our approximately 2.7 million square foot in-service office portfolio in Cambridge was approximately 96% leased as of December 31, 2022.

In January 2023, BXP commenced the development of 290 Binney Street and the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts for an estimated total investment of approximately $1.4 billion. 290 Binney Street is an approximately 566,000 net rentable square foot laboratory/life sciences project that is 100% pre-leased to AstraZeneca. Concurrent with the commencement of this project, BXP removed from service and began demolition of the existing Kendall Center Blue Parking Garage to support the development of this project. 300 Binney Street is a conversion of an approximately 195,000 net rentable square foot property into an approximately 240,000 net rentable square foot laboratory/life sciences property. 300 Binney Street is 100% pre-leased to a life sciences organization.

Our Route 128-Mass Turnpike portfolio is comprised of approximately 4.9 million square feet and was approximately 81% leased as of December 31, 2022. On December 23, 2022, we fully placed in-service 880 Winter Street, an approximately 244,000 square foot laboratory/life sciences project located in Waltham, Massachusetts. Including leases that have not yet commenced, 880 Winter Street is 97% pre-leased as of February 21, 2023.

Los Angeles

Our Los Angeles (“LA”) in-service portfolio of approximately 2.3 million square feet is currently focused in West LA and includes Colorado Center, an approximately 1.1 million square foot property of which we own 50%, and Santa Monica Business Park, a 21-building, approximately 1.2 million square foot property of which we own 55%. As of December 31, 2022, our LA in-service properties were approximately 88% leased.

New York

During the fourth quarter of 2022, we executed approximately 304,000 square feet of leases in the New York region and approximately 148,000 square feet of leases commenced. Approximately 107,000 square feet of the leases that commenced in the fourth quarter had been vacant for less than one year and they represent a decrease in net rental obligations of approximately 17% over the prior leases. As of December 31, 2022, our New York CBD in-service portfolio was approximately 88% leased.

On November 30, 2022, we commenced the redevelopment of 105 Carnegie Center, located in Princeton, New Jersey. 105 Carnegie Center is an approximately 70,000 square foot property that will be redeveloped into an approximately 73,000 square foot laboratory/life sciences space. Life science clients have already been reviewing the opportunity.

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San Francisco

During the fourth quarter of 2022, we executed approximately 213,000 square feet of leases and approximately 225,000 square feet of leases commenced in the San Francisco region. Approximately 92,000 square feet of leases that commenced had been vacant for less than one year and represent an increase in net rental obligations of approximately 28% over the prior leases.

Our San Francisco CBD in-service properties were approximately 89% leased as of December 31, 2022.

Seattle

Our Seattle in-service portfolio includes Safeco Plaza, an approximately 778,000 square foot property of which we own 33.67%, and Madison Centre, an approximately 755,000 square foot property. As of December 31, 2022, our Seattle in-service properties were approximately 88% leased.

Washington, DC

During the fourth quarter of 2022, we executed approximately 321,000 square feet of leases and approximately 648,000 square feet of leases commenced in the Washington, DC region. Approximately 79,000 square feet of the leases that commenced had been vacant for less than one year and represent a decrease in net rental obligations of approximately 11% over the prior leases. Our Washington, DC CBD in-service properties were approximately 88% leased as of December 31, 2022.

A significant component of our Washington, DC regional portfolio is in Reston Town Center, an award-winning mixed-use development in Northern Virginia. Reston is a hub for technology, cloud services, cybersecurity and defense intelligence companies. Our Reston, Virginia properties were approximately 89% leased as of December 31, 2022. In Reston, Virginia, we fully placed in-service Reston Next, a premier workplace project consisting of two buildings totaling approximately 1.1 million square feet. Including leases that have not yet commenced, this project is 90% leased as of February 21, 2023.

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Leasing Statistics

The table below details the leasing activity, including 100% of the unconsolidated joint ventures, that commenced during the year ended December 31, 2022:

	Year ended December 31, 2022
	(Square Feet)
Vacant space available at the beginning of the period	5,340,029
Property dispositions/properties taken out of service (1)	(530,107)
Vacant space in properties acquired (2)	142,018
Properties placed (and partially placed) in-service (3)	1,713,366
Leases expiring or terminated during the period	6,158,731
Total space available for lease	12,824,037
1st generation leases	1,505,314
2nd generation leases with new clients	2,965,270
2nd generation lease renewals	2,742,676
Total space leased (4)	7,213,260
Vacant space available for lease at the end of the period	5,610,777
Leases executed during the period, in square feet (5)	5,696,677
Second generation leasing information: (6)
Leases commencing during the period, in square feet	5,707,946
Weighted Average Lease Term	99 Months
Weighted Average Free Rent Period	121 Days
Total Transaction Costs Per Square Foot (7)	$83.70
Increase in Gross Rents (8)	3.98	%
Increase in Net Rents (9)	5.29	%

 __________________

(1)Total vacant square feet of properties taken out of service and property dispositions during the year ended December 31, 2022 consists of 117,907 square feet at 760 Boylston Street, 95,180 square feet at 651 Gateway, 185,298 square feet at Virginia 95 Office Park, 5,270 square feet at 601 Massachusetts Avenue, 69,995 square feet at 105 Carnegie Center and 56,457 square feet at 2096 Gaither Road.

(2)Total vacant square feet of properties acquired during the year ended December 31, 2022 consists of 77,581 square feet at Madison Centre and 64,437 square feet at 200 Fifth Avenue.

(3)Total square feet of properties placed (and partially placed) in-service during the year ended December 31, 2022 consists of 243,614 square feet at 880 Winter Street, 761,492 square feet at Reston Next, 294,252 square feet at 2100 Pennsylvania Avenue and 414,008 square feet at 325 Main Street.

(4)Represents leases for which lease revenue recognition has commenced in accordance with GAAP during the year ended December 31, 2022.

(5)Represents leases executed during the year ended December 31, 2022 for which we either (1) commenced lease revenue recognition in such period or (2) will commence lease revenue recognition in subsequent periods, in accordance with GAAP, and includes leases at properties currently under development. The total square feet of leases executed and recognized during the year ended December 31, 2022 is 1,002,153 square feet.

(6)Second generation leases are defined as leases for space that had previously been leased by us. Of the 5,707,946 square feet of second generation leases that commenced during the year ended December 31, 2022, leases for 4,717,398 square feet were signed in prior periods.

(7)Total transaction costs include tenant improvements and leasing commissions but exclude free rent concessions and other inducements in accordance with GAAP.

(8)Represents the increase in gross rent (base rent plus expense reimbursements) on the new versus expired leases on the 4,209,361 square feet of second generation leases that had been occupied within the prior 12 months for the year ended December 31, 2022; excludes leases that management considers temporary because the client is not expected to occupy the space on a long-term basis.

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(9)Represents the increase in net rent (gross rent less operating expenses) on the new versus expired leases on the 4,209,361 square feet of second generation leases that had been occupied within the prior 12 months for the year ended December 31, 2022.

For descriptions of significant transactions that we completed during 2022, see “Item 1. Business—Transactions During 2022.”

Critical Accounting Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP, requires management to use judgment in the application of accounting policies, including making estimates and assumptions. We base our estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. These judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different, it is possible that different accounting policies would have been applied resulting in a different presentation of our financial statements. From time to time, we evaluate our estimates and assumptions. In the event estimates or assumptions prove to be different from actual results, adjustments are made in subsequent periods to reflect more current information. Our significant accounting policies, which utilize these critical accounting estimates, are described in Note 2 to our Consolidated Financial Statements.

We consider our critical accounting estimates to be those used in the determination of the reported amounts and disclosure related to the following:

•Purchase price allocations,

•Impairment and

•Impairment related to unconsolidated joint ventures.

Each of the above critical accounting estimates is described in more detail below.

Real Estate

Purchase Price Allocations

We assess the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocate the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. We assess fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that we deem appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. We also consider an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the clients, the clients’ credit quality and expectations of lease renewals. Based on our acquisitions to date, our allocation to customer relationship intangible assets has been immaterial.

We record acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in our Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on our evaluation of the specific characteristics of each client’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the

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expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, we consider leasing commissions, legal and other related expenses.

During the year ended December 31, 2022, we completed the acquisition of Madison Centre in Seattle, Washington and 125 Broadway in Cambridge, Massachusetts for an aggregate net purchase price of approximately $1.3 billion. These transactions were accounted for as asset acquisitions, and the purchase price of each was allocated based on the relative fair values of the assets acquired and liabilities assumed (See Note 3 to the Consolidated Financial Statements).

Impairment

Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. The evaluation of anticipated cash flows is subjective and is based in part on assumptions regarding anticipated hold periods, future occupancy, future rental rates, future capital requirements, discount rates and capitalization rates that could differ materially from actual results in future periods. Because cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset may be impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our hold strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If we determine that an impairment has occurred, the affected assets must be reduced to their fair value.

Unconsolidated Joint Ventures

Impairment

Our investments in unconsolidated joint ventures are reviewed for indicators of impairment on a quarterly basis and we record impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. We will record an impairment charge if we determine that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value is calculated using discounted cash flows which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, debt interest rates and availability, discount rates and capitalization rates that could differ materially from actual results in future periods.

As of December 31, 2022, the net carrying amounts of our investments in unconsolidated joint ventures was approximately $1.6 billion, which includes investments with deficit balances aggregating approximately $85.4 million included within Other Liabilities in our Consolidated Balance Sheets. During the year ended December 31, 2022, we recorded an other-than-temporary impairment of approximately $50.7 million related to our Dock 72 unconsolidated joint venture (See Note 6 to the Consolidated Financial Statements).

Income Taxes 

Our accounting policies related to income tax are described in Note 2 to our Consolidated Financial Statements.

BXP

The net difference between the tax basis and the reported amounts of BXP’s assets and liabilities was approximately $2.1 billion and $1.8 billion as of December 31, 2022 and 2021, respectively, which was primarily related to the difference in basis of contributed property and accrued rental income.

Certain entities included in BXP’s Consolidated Financial Statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying Consolidated Financial Statements. 

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The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income: 

	For the year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	848,947	$	505,195	$	872,727
Straight-line rent and net “above-” and “below-market” rent adjustments	(88,487)		(107,942)		(90,144)
Book/Tax differences from depreciation and amortization	172,558		146,028		106,203
Book/Tax differences on gains/(losses) from capital transactions	(273,345)		(25,756)		(345,854)
Book/Tax differences from stock-based compensation	42,510		61,387		42,576
Tangible Property Regulations	(112,355)		(77,489)		(144,981)
Other book/tax differences, net	51,490		71,464		117,166
Taxable income	$	641,318	$	572,887	$	557,693

BPLP

The net difference between the tax basis and the reported amounts of BPLP’s assets and liabilities was approximately $3.2 billion and $2.9 billion as of December 31, 2022 and 2021, respectively, which was primarily related to the difference in basis of contributed property and accrued rental income.

Certain entities included in BPLP’s Consolidated Financial Statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying Consolidated Financial Statements.

The following table reconciles GAAP net income attributable to Boston Properties Limited Partnership to taxable income:

	For the year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	957,265	$	570,965	$	990,479
Straight-line rent and net “above-” and “below-market” rent adjustments	(98,770)		(120,074)		(100,375)
Book/Tax differences from depreciation and amortization	173,272		144,794		101,470
Book/Tax differences on gains/(losses) from capital transactions	(289,174)		(24,109)		(359,497)
Book/Tax differences from stock-based compensation	47,450		68,287		47,408
Tangible Property Regulations	(125,411)		(86,199)		(161,435)
Other book/tax differences, net	48,982		81,693		121,397
Taxable income	$	713,614	$	635,357	$	639,447

Results of Operations for the Year Ended December 31, 2022 and 2021

This section of this Form 10-K generally discusses 2022 and 2021 items and year-to-year comparisons between 2022 and 2021. Discussions of 2020 items and year-to-year comparisons between 2021 and 2020 that are not included in this Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2021, which was filed with the SEC on February 25, 2022.

Net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders increased by approximately $352.7 million and $395.3 million for the year ended December 31, 2022 compared to 2021, respectively, as set forth in the following tables and for the reasons discussed below under the heading “Comparison of the year ended December 31, 2022 to the year ended December 31, 2021” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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The following are reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to Net Operating Income for the years ended December 31, 2022 and 2021. For a detailed discussion of Net Operating Income (“NOI”), including the reasons management believes NOI is useful to investors, see page 70.

BXP

	Year ended December 31,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties, Inc. Common Shareholders	$	848,947	$	496,223	$	352,724	71.08	%
Preferred stock redemption charge	—		6,412		(6,412)		(100.00)	%
Preferred dividends	—		2,560		(2,560)		(100.00)	%
Net Income Attributable to Boston Properties, Inc.	848,947		505,195		343,752		68.04	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership	96,780		55,931		40,849		73.03	%
Noncontrolling interests in property partnerships	74,857		70,806		4,051		5.72	%
Net Income	1,020,584		631,932		388,652		61.50	%
Other Expenses:
Add:
Interest expense	437,139		423,346		13,793		3.26	%
Losses from early extinguishment of debt	—		45,182		(45,182)		(100.00)	%
Unrealized loss on non-real estate investment	150		—		150		100.00	%
Loss from unconsolidated joint ventures	59,840		2,570		57,270		2,228.40	%
Other Income:
Less:
Gains (losses) from investments in securities	(6,453)		5,626		(12,079)		(214.70)	%
Other income - assignment fee	6,624		—		6,624		100.00	%
Interest and other income (loss)	11,940		5,704		6,236		109.33	%
Gain on sales-type lease	10,058		—		10,058		100.00	%
Gains on sales of real estate	437,019		123,660		313,359		253.40	%
Other Expenses:
Add:
Depreciation and amortization expense	749,775		717,336		32,439		4.52	%
Transaction costs	2,905		5,036		(2,131)		(42.32)	%
Payroll and related costs from management services contracts	15,450		12,487		2,963		23.73	%
General and administrative expense	146,378		151,573		(5,195)		(3.43)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		2,963		23.73	%
Development and management services revenue	28,056		27,697		359		1.30	%
Net Operating Income	$	1,929,527	$	1,814,288	$	115,239	6.35	%

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BPLP

	Year ended December 31,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders	$	957,265	$	561,993	$	395,272	70.33	%
Preferred unit redemption charge	—		6,412		(6,412)		(100.00)	%
Preferred distributions	—		2,560		(2,560)		(100.00)	%
Net Income Attributable to Boston Properties Limited Partnership	957,265		570,965		386,300		67.66	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships	74,857		70,806		4,051		5.72	%
Net Income	1,032,122		641,771		390,351		60.82	%
Other Expenses:
Add:
Interest expense	437,139		423,346		13,793		3.26	%
Losses from early extinguishment of debt	—		45,182		(45,182)		(100.00)	%
Unrealized loss on non-real estate investment	150		—		150		100.00	%
Loss from unconsolidated joint ventures	59,840		2,570		57,270		2,228.40	%
Other Income:
Less:
Gains (losses) from investments in securities	(6,453)		5,626		(12,079)		(214.70)	%
Other income - assignment fee	6,624		—		6,624		100.00	%
Interest and other income (loss)	11,940		5,704		6,236		109.33	%
Gain on sales-type lease	10,058		—		10,058		100.00	%
Gains on sales of real estate	441,075		125,198		315,877		252.30	%
Other Expenses:
Add:
Depreciation and amortization expense	742,293		709,035		33,258		4.69	%
Transaction costs	2,905		5,036		(2,131)		(42.32)	%
Payroll and related costs from management services contracts	15,450		12,487		2,963		23.73	%
General and administrative expense	146,378		151,573		(5,195)		(3.43)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		2,963		23.73	%
Development and management services revenue	28,056		27,697		359		1.30	%
Net Operating Income	$	1,929,527	$	1,814,288	$	115,239	6.35	%

At December 31, 2022 and 2021, we owned or had joint venture interests in a portfolio of 194 and 201 commercial real estate properties, respectively (in each case, the “Total Property Portfolio”). As a result of changes within our Total Property Portfolio, the financial data presented below shows significant changes in revenue and expenses from period-to-period. Accordingly, we do not believe that our period-to-period financial data with respect to the Total Property Portfolio provides a complete understanding of our operating results. Therefore, the comparison of operating results for the year ended December 31, 2022 and 2021 show separately the changes attributable to the properties that were owned by us and in-service throughout each period compared (the “Same Property Portfolio”) and the changes attributable to the properties included in the Acquired, Placed In-Service, Development or Redevelopment or Sold Portfolios.

In our analysis of operating results, particularly to make comparisons of net operating income between periods more meaningful, it is important to provide information for properties that were in-service and owned by us throughout each period presented. We refer to properties acquired or placed in-service prior to the beginning of the

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earliest period presented and owned by us and in-service through the end of the latest period presented as our Same Property Portfolio. The Same Property Portfolio therefore excludes properties acquired, placed in-service or in development or redevelopment after the beginning of the earliest period presented or disposed of prior to the end of the latest period presented.

NOI is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred stock/unit redemption charge, preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, losses from early extinguishment of debt, unrealized loss on non-real estate investment, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gain on sales-type lease, gains on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue. We use NOI internally as a performance measure and believe it provides useful information to investors regarding our results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, may distort operating performance measures at the property level. NOI presented by us may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.

We believe that in order to understand our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders as presented in our Consolidated Financial Statements. NOI should not be considered as a substitute for net income attributable to Boston Properties, Inc. common shareholders or net income attributable to Boston Properties Limited Partnership common unitholders (determined in accordance with GAAP) or any other GAAP financial measures and should only be considered together with and as a supplement to our financial information prepared in accordance with GAAP.

The gains on sales of real estate and depreciation expense may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor redemptions of common units of limited partnership interest of BPLP (“OP Units”). This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties. The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in gains on sales of real estate and depreciation expense when those properties are sold. For additional information see the Explanatory Note that follows the cover page of this Annual Report on Form 10-K.

Comparison of the year ended December 31, 2022 to the year ended December 31, 2021

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 124 properties totaling approximately 37.8 million net rentable square feet, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to January 1, 2021 and owned and in service through December 31, 2022. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, in development or redevelopment after January 1, 2021 or disposed of on or prior to December 31, 2022. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the years ended December 31, 2022 and 2021 with respect to the properties that were acquired, placed in-service, in development or redevelopment or sold.

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	Same Property Portfolio								Properties Acquired Portfolio				Properties Placed In-Service Portfolio				Properties in Development or Redevelopment Portfolio				Properties Sold Portfolio				Total Property Portfolio
	2022		2021		Increase/ (Decrease)		% Change		2022		2021		2022		2021		2022		2021		2022		2021		2022		2021		Increase/ (Decrease)		% Change
	(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)	$	2,670,752	$	2,588,606	$	82,146	3.17	%	$	54,057	$	6,702	$	96,004	$	27,422	$	3,906	$	7,409	$	33,853	$	69,628	$	2,858,572	$	2,699,767	$	158,805	5.88	%
Termination Income	7,302		11,482		(4,180)		(36.40)	%	402		—		—		—		—		—		—		—		7,704		11,482		(3,778)		(32.90)	%
Lease Revenue	2,678,054		2,600,088		77,966		3.00	%	54,459		6,702		96,004		27,422		3,906		7,409		33,853		69,628		2,866,276		2,711,249		155,027		5.72	%
Parking and Other	98,913		79,565		19,348		24.32	%	2,348		—		39		15		424		205		412		1,126		102,136		80,911		21,225		26.23	%
Total Rental Revenue (1)	2,776,967		2,679,653		97,314		3.63	%	56,807		6,702		96,043		27,437		4,330		7,614		34,265		70,754		2,968,412		2,792,160		176,252		6.31	%
Real Estate Operating Expenses	1,027,141		960,299		66,842		6.96	%	12,301		1,432		25,095		9,729		3,395		3,573		10,555		21,674		1,078,487		996,707		81,780		8.21	%
Net Operating Income, Excluding Residential and Hotel	1,749,826		1,719,354		30,472		1.77	%	44,506		5,270		70,948		17,708		935		4,041		23,710		49,080		1,889,925		1,795,453		94,472		5.26	%
Residential Net Operating Income (2)	21,351		11,718		9,633		82.21	%	—		—		—		—		—		—		6,247		6,506		27,598		18,224		9,374		51.44	%
Hotel Net Operating Income (2)	12,004		611		11,393		1,864.65	%	—		—		—		—		—		—		—		—		12,004		611		11,393		1,864.65	%
Net Operating Income	$	1,783,181	$	1,731,683	$	51,498	2.97	%	$	44,506	$	5,270	$	70,948	$	17,708	$	935	$	4,041	$	29,957	$	55,586	$	1,929,527	$	1,814,288	$	115,239	6.35	%

_______________

(1)Rental Revenue is equal to Revenue less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Revenue per the Consolidated Statements of Operations, excluding the residential and hotel revenue that is noted below. We use Rental Revenue internally as a performance measure and in calculating other non-GAAP financial measures (e.g., NOI), which provides investors with information regarding our performance that is not immediately apparent from the comparable non-GAAP measures and allows investors to compare operating performance between periods.

(2)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 70. Residential Net Operating Income for the year ended December 31, 2022 and 2021 is comprised of Residential Revenue of $57,181 and $42,668 less Residential Expenses of $29,583 and $24,444, respectively. Hotel Net Operating Income for the year ended December 31, 2022 and 2021 is comprised of Hotel Revenue of $39,482 and $13,609 less Hotel Expenses of $27,478 and $12,998, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio

Lease Revenue (Excluding Termination Income)

Lease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $82.1 million for the year ended December 31, 2022 compared to 2021. The increase was a result of our average revenue per square foot increasing by approximately $2.96, contributing approximately $99.3 million, partially offset by average occupancy decreasing from 91.7% to 91.1%, resulting in a decrease of approximately $17.2 million.

Termination Income

Termination income decreased by approximately $4.2 million for the year ended December 31, 2022 compared to 2021.

Termination income for the year ended December 31, 2022 related to approximately 29 clients across the Same Property Portfolio and totaled approximately $6.7 million, which was primarily related to clients that terminated leases early in New York City. In addition, we received a distribution from our unsecured credit claim against Lehman Brothers, Inc. of approximately $0.6 million.

Termination income for the year ended December 31, 2021 related to 27 clients across the Same Property Portfolio and totaled approximately $11.5 million, which was primarily related to clients that terminated leases early in New York City and the Boston region.

Parking and Other Revenue

Parking and other revenue increased by approximately $19.3 million for the year ended December 31, 2022 compared to 2021. Parking revenue increased by approximately $19.7 million and was partially offset by a decrease in other revenue of approximately $0.4 million. The increase in parking revenue was primarily due to an increase in transient and monthly parking primarily in the Boston region.

Real Estate Operating Expenses

Real estate operating expenses from the Same Property Portfolio increased by approximately $66.8 million, or 7.0%, for the year ended December 31, 2022 compared to 2021, due primarily to an increase in operating expenses, including cleaning, utilities, repairs and maintenance, and roads/grounds/security. The increase in operating expenses was primarily driven by an increase in physical occupancy.

Properties Acquired Portfolio

The table below lists the properties acquired between January 1, 2021 and December 31, 2022. Rental revenue and real estate operating expenses increased by approximately $50.1 million and $10.9 million, respectively, for the year ended December 31, 2022 compared to 2021, as detailed below.

		Square Feet	Rental Revenue						Real Estate Operating Expenses
Name	Date acquired		2022		2021		Change		2022		2021		Change
			(dollars in thousands)
153 & 211 Second Avenue	June 2, 2021	136,882	$	10,446	$	5,470	$	4,976	$	1,106	$	547	$	559
Shady Grove Innovation District	August 2, 2021	182,290	2,943		1,232		1,711		1,760		885		875
Madison Centre (1)	May 17, 2022	754,988	31,978		—		31,978		8,386		—		8,386
125 Broadway	September 16, 2022	271,000	11,440		—		11,440		1,049		—		1,049
		1,345,160	$	56,807	$	6,702	$	50,105	$	12,301	$	1,432	$	10,869

______________

(1)Rental revenue for the year ended December 31, 2022 includes approximately $0.4 million of termination income.

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Properties Placed In-Service Portfolio

The table below lists the properties that were placed in-service or partially placed in-service between January 1, 2021 and December 31, 2022. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $68.6 million and $15.4 million, respectively, for the year ended December 31, 2022 compared to 2021, as detailed below.

	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service		Rental Revenue						Real Estate Operating Expenses
Name			Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
One Five Nine East 53rd Street (1)	First Quarter, 2021	First Quarter, 2021	220,000	$	17,909	$	15,672	$	2,237	$	2,668	$	3,582	$	(914)
200 West Street (2)	Fourth Quarter, 2020	Fourth Quarter, 2021	273,365	16,960		6,612		10,348		5,519		3,181		2,338
Reston Next	Fourth Quarter, 2021	Fourth Quarter, 2022	1,063,236	35,248		2,677		32,571		11,831		1,140		10,691
325 Main Street (3)	Second Quarter, 2022	Second Quarter, 2022	414,008	21,177		—		21,177		2,532		317		2,215
2100 Pennsylvania Avenue	Second Quarter, 2022	N/A	480,000	851		—		851		867		—		867
880 Winter Street (4)	Third Quarter, 2022	Fourth Quarter, 2022	243,618	3,898		2,476		1,422		1,678		1,509		169
			2,694,227	$	96,043	$	27,437	$	68,606	$	25,095	$	9,729	$	15,366

_____________

(1)This is the low-rise portion of 601 Lexington Avenue.

(2)Includes 138,444 square feet of redevelopment that was fully placed in-service in December 2021.

(3)Real estate operating expenses for the year ended December 31, 2021 were related to demolition costs.

(4)Conversion of a 224,000 square foot office property located in Waltham, Massachusetts to laboratory space.

Properties in Development or Redevelopment Portfolio

The table below lists the properties that were in development or redevelopment between January 1, 2021 and December 31, 2022. Rental revenue and real estate operating expenses from our Properties in Development or Redevelopment Portfolio decreased by approximately $3.3 million and $0.2 million, respectively, for the year ended December 31, 2022 compared to 2021, as detailed below.

			Rental Revenue						Real Estate Operating Expenses
Name	Date Commenced Development / Redevelopment	Square Feet	2022		2021		Change		2022		2021		Change
			(dollars in thousands)
3625-3635 Peterson Way (1)	April 16, 2021	218,000	$	—	$	1,753	$	(1,753)	$	1,059	$	459	$	600
140 Kendrick Street - Building A	July 1, 2022	104,000	2,866		4,410		(1,544)		902		1,272		(370)
760 Boylston Street	September 12, 2022	118,000	—		247		(247)		608		1,039		(431)
105 Carnegie Center	November 30, 2022	73,000	1,464		1,204		260		826		803		23
		513,000	$	4,330	$	7,614	$	(3,284)	$	3,395	$	3,573	$	(178)

_____________

(1)On April 16, 2021, we removed 3625-3635 Peterson Way, located in Santa Clara, California, from our in-service portfolio. We demolished the building and expect to redevelop the site at a future date.

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Properties Sold Portfolio

The table below lists the properties we sold between January 1, 2021 and December 31, 2022. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $37.2 million and $11.6 million, respectively, for the year ended December 31, 2022 compared to 2021, as detailed below.

				Rental Revenue						Real Estate Operating Expenses
Name	Date Sold	Property Type	Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
Office
181, 191 and 201 Spring Street	October 25, 2021	Office	333,000	$	—	$	12,649	$	(12,649)	$	—	$	3,999	$	(3,999)
195 West Street	March 31, 2022	Office	63,500	749		1,578		(829)		242		734		(492)
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	5,190		13,774		(8,584)		1,787		3,903		(2,116)
601 Massachusetts Avenue	August 30, 2022	Office	478,667	28,225		42,753		(14,528)		8,499		13,038		(4,539)
Total Office			1,608,588	34,164		70,754		(36,590)		10,528		21,674		(11,146)
Residential
The Avant at Reston Town Center (1)	November 8, 2022	Residential	329,195	10,682		11,327		(645)		4,361		4,821		(460)
Total Residential			329,195	10,682		11,327		(645)		4,361		4,821		(460)
			1,937,783	$	44,846	$	82,081	$	(37,235)	$	14,889	$	26,495	$	(11,606)

_____________

(1)We retained and continue to own approximately 26,000 square feet of ground-level retail space. Rental Revenue and Real Estate Operating Expenses shown represent the entire property and not just the portion sold.

For additional information on the sales of the above properties refer to “Results of Operations—Other Income and Expense Items—Gains on Sales of Real Estate” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Residential Net Operating Income

Net operating income for our residential same properties increased by approximately $9.6 million for the years ended December 31, 2022 compared to 2021. The increase in net operating income was primarily due to the initial lease-up of the Skylyne, which was fully placed in-service during the third quarter of 2020.

The following reflects our occupancy and rate information for our residential same properties for the year ended December 31, 2022 and 2021.

	Average Monthly Rental Rate (1)						Average Rental Rate Per Occupied Square Foot						Average Physical Occupancy (2)						Average Economic Occupancy (3)
Name	2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)
Proto Kendall Square	$	2,844	$	2,615	8.8	%	$	5.23	$	4.80	9.0	%	94.9	%	93.0	%	2.0	%	94.2	%	92.0	%	2.4	%
The Lofts at Atlantic Wharf	$	4,162	$	3,558	17.0	%	$	4.62	$	3.99	15.8	%	97.8	%	94.2	%	3.8	%	97.4	%	92.2	%	5.6	%
Signature at Reston	$	2,653	$	2,358	12.5	%	$	2.73	$	2.44	11.9	%	94.9	%	88.6	%	7.1	%	94.5	%	86.0	%	9.9	%
The Skylyne	$	3,391	$	3,207	5.7	%	$	4.20	$	3.83	9.7	%	84.8	%	37.8	%	124.3	%	82.3	%	31.6	%	160.4	%

_____________  

(1)Average Monthly Rental Rate is calculated as the average of the quotients obtained by dividing (A) rental revenue as determined in accordance with GAAP, by (B) the number of occupied units for each month within the applicable fiscal period.

(2)Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.

(3)Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current

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Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Actual market rents and trends in such rents for a region as reported by others may vary materially from Market Rents used by us. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.

Hotel Net Operating Income

The Boston Marriott Cambridge hotel had net operating income of approximately $12.0 million for the year ended December 31, 2022, representing an increase of approximately $11.4 million compared to the year ended December 31, 2021. As demand for travel has returned, the Boston Marriott Cambridge has seen an increase in occupancy and room rates, which has led to increased net operating income.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the year ended December 31, 2022 and 2021.

	2022			2021			Change (%)
Occupancy	64.6		%	33.5		%	92.8	%
Average daily rate	$	315.55		$	211.59		49.1	%
REVPAR	$	203.83		$	70.92		187.4	%

Other Operating Revenue and Expense Items

Development and Management Services Revenue

Development and management services revenue increased by approximately $0.4 million for the year ended December 31, 2022 compared to 2021. Management services revenue increased by approximately $2.3 million and development services revenue decreased by approximately $1.9 million. The increase in management services revenue was primarily related to an increase in property management fees from an unconsolidated joint venture in the Boston region and asset management fees from unconsolidated joint ventures in the Los Angeles and Seattle regions. The decrease in development services revenue was primarily related to a decrease in development fees earned from unconsolidated joint venture properties in the Washington, DC and Boston regions, which were placed in-service during prior periods.

General and Administrative Expense

General and administrative expense decreased by approximately $5.2 million for the year ended December 31, 2022 compared to 2021 primarily due to a decrease in compensation expense of approximately $11.9 million, partially offset by an approximately $6.7 million increase in other general and administrative expenses. The decrease in compensation expense related to an approximately $12.1 million decrease in the value of our deferred compensation plan and an approximately $0.2 million increase in other compensation expenses. The increase in other general and administrative expenses was primarily related to an increase in professional fees.

Wages directly related to the development of rental properties are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the applicable asset or lease term. Capitalized wages for the year ended December 31, 2022 and 2021 were approximately $16.1 million and $13.7 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

Transaction costs decreased by approximately $2.1 million for the year ended December 31, 2022 compared to 2021 due primarily to costs incurred in connection with the pursuit and formation of new joint ventures in 2021 that did not occur at the same levels in 2022. In general, transaction costs relating to the formation of new joint ventures and the pursuit of other transactions are expensed as incurred.

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Depreciation and Amortization Expense

Depreciation expense may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP.  This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties.  The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in depreciation expense. For additional information see the Explanatory Note that follows the cover page of this Annual Report on Form 10-K.

BXP

Depreciation and amortization expense increased by approximately $32.4 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the year ended December 31,
	2022		2021		Change
	(in thousands)
Same Property Portfolio (1)	$	658,008	$	660,851	$	(2,843)
Properties Acquired Portfolio	43,509		8,904		34,605
Properties Placed In-Service Portfolio (2)	34,869		28,031		6,838
Properties in Development or Redevelopment Portfolio	5,051		3,758		1,293
Properties Sold Portfolio	8,338		15,792		(7,454)
	$	749,775	$	717,336	$	32,439

_____________

(1)During the year ended December 31, 2021, we commenced redevelopment of View Boston Observatory at The Prudential Center, a 59,000 net rentable square foot redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. As a result, during the year ended December 31, 2021, we recorded approximately $2.6 million of accelerated depreciation expense for the demolition of the space, of which approximately $0.8 million related to the step-up of real estate assets.

(2)On February 25, 2021, we commenced redevelopment of 880 Winter Street in Waltham, Massachusetts. As a result, during the year ended December 31, 2021, we recorded approximately $13.7 million of accelerated depreciation expense for the demolition of a portion of the building.

BPLP

Depreciation and amortization expense increased by approximately $33.3 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the year ended December 31,
	2022		2021		Change
	(in thousands)
Same Property Portfolio (1)	$	650,774	$	652,550	$	(1,776)
Properties Acquired Portfolio	43,509		8,904		34,605
Properties Placed In-Service Portfolio (2)	34,869		28,031		6,838
Properties in Development or Redevelopment Portfolio	4,803		3,758		1,045
Properties Sold Portfolio	8,338		15,792		(7,454)
	$	742,293	$	709,035	$	33,258

_____________

(1)During the year ended December 31, 2021, we commenced redevelopment of View Boston Observatory at The Prudential Center, a 59,000 net rentable square foot redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. As a result, during the year ended December 31, 2021, we recorded approximately $1.8 million of accelerated depreciation expense for the demolition of the space.

(2)On February 25, 2021, we commenced redevelopment of 880 Winter Street in Waltham, Massachusetts. As a result, during the year ended December 31, 2021, we recorded approximately $13.7 million of accelerated depreciation expense for the demolition of a portion of the building.

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Direct Reimbursements of Payroll and Related Costs From Management Services Contracts and Payroll and Related Costs From Management Service Contracts

We have determined that amounts reimbursed for payroll and related costs received from third parties in connection with management services contracts should be reflected on a gross basis instead of on a net basis as we have determined that we are the principal under these arrangements. We anticipate that these two financial statement line items will generally offset each other.

Other Income and Expense Items

Loss from Unconsolidated Joint Ventures

For the year ended December 31, 2022 compared to 2021, loss from unconsolidated joint ventures increased by approximately $57.3 million primarily due to (1) a $50.7 million non-cash impairment charge at our Dock 72 joint venture during the year ended December 31, 2022, (2) a $10.3 million gain on sale of investment from the sale of our Annapolis Junction joint venture interest during the year ended December 31, 2021 and (3) an increase in interest expense due to increasing interest rates on variable rate debt.

The unconsolidated joint venture properties have approximately $4.0 billion of outstanding debt, which is primarily variable rate. Therefore, we expect our share of joint venture income to be impacted by higher interest rates.

Gains on Sales of Real Estate

Gains on sales of real estate may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP. This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties. The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in the gains on sales of real estate when those properties are sold. For additional information, see the Explanatory Note that follows the cover page of this Annual Report on Form 10-K.

BXP

Gains on sales of real estate increased by approximately $313.4 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
195 West Street	March 31, 2022	Office	63,500	$	37.7	$	35.4	$	22.7
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	127.5		121.9		96.2
601 Massachusetts Avenue	August 30, 2022	Office	478,667	531.0		512.3		237.4
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
The Avant at Reston Town Center	November 8, 2022	Residential	329,195	141.0		139.6		55.6
				$	864.2	$	834.8	$	436.3	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	8.1	(2)
181, 191 and 201 Spring Street	October 25, 2021	Office	333,000	$	191.5	$	179.9	115.6
				$	191.5	$	179.9	$	123.7

_____________

(1)Excludes approximately $0.7 million of gains on sales of real estate recognized during the year ended December 31, 2022 related to gains on sales of real estate occurring in the prior year.

(2)On December 13, 2018, we sold our 6595 Springfield Center Drive development project located in Springfield, Virginia. Concurrently with the sale, we agreed to act as development manager and guaranteed the completion of the project. The development project achieved final completion during the third quarter of 2021 at which time the total cost of development was determined to be below the estimated total investment at the time of sale. As a result, we recognized a gain of approximately $8.1 million.

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BPLP

Gains on sales of real estate increased by approximately $315.9 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
195 West Street	March 31, 2022	Office	63,500	$	37.7	$	35.4	$	23.4
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	127.5		121.9		99.5
601 Massachusetts Avenue	August 30, 2022	Office	478,667	531.0		512.3		237.5
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
The Avant at Reston Town Center	November 8, 2022	Residential	329,195	141.0		139.6		55.6
				$	864.2	$	834.8	$	440.4	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	8.1	(2)
181, 191 and 201 Spring Street	October 25, 2021	Office	333,000	$	191.5	$	179.9	117.1
				$	191.5	$	179.9	$	125.2

_____________

(1)Excludes approximately $0.7 million of gains on sales of real estate recognized during the year ended December 31, 2022 related to gains on sales of real estate occurring in the prior year.

(2)On December 13, 2018, we sold our 6595 Springfield Center Drive development project located in Springfield, Virginia. Concurrently with the sale, we agreed to act as development manager and guaranteed the completion of the project. The development project achieved final completion during the third quarter of 2021 at which time the total cost of development was determined to be below the estimated total investment at the time of sale. As a result, we recognized a gain of approximately $8.1 million.

Gain on sales-type lease

In connection with a ground lease amendment, executed on December 19, 2022 with a third-party hotel developer, we recorded a sales-type lease receivable of approximately $13.0 million, which includes an unguaranteed residual asset of approximately $17,000. The sales-type lease receivable was measured as the present value of the fixed and determinable lease payments, including the unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease. In addition, we recorded a gain on sales-type lease of approximately $10.1 million associated with the derecognition of the asset. We did not recognize any interest income during the year ended December 31, 2022 (See Note 4 to the Consolidated Financial Statements).

Interest and Other Income (Loss)

Interest and other income (loss) increased by approximately $6.2 million for the year ended December 31, 2022 compared to 2021, due primarily to an increase of approximately $7.3 million in interest income due to increased interest earned on our deposits.

Other Income - Assignment Fee

On April 19, 2021, we entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, we executed an agreement to assign the right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the year ended December 31, 2022 and 2021 related to investments that we have made to reduce our market risk relating to deferred compensation plans that we maintain for BXP’s officers and former non-employee directors. Under the deferred compensation plans, each officer or non-employee director who is eligible to participate is permitted to defer a portion of the officer’s current income or the non-employee director’s compensation on a pre-tax basis and receive a tax-deferred return on these deferrals

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based on the performance of specific investments selected by the officer or non-employee director. In order to reduce our market risk relating to these plans, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer or non-employee director. This enables us to generally match our liabilities to BXP’s officers or former non-employee directors under our deferred compensation plans with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains (losses) from investments in securities. During the year ended December 31, 2022 and 2021, we recognized gains (losses) of approximately $(6.5) million and $5.6 million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $(6.5) million and $5.6 million during the year ended December 31, 2022 and 2021, respectively, as a result of increases (decreases) in our liability under our deferred compensation plans that was associated with the performance of the specific investments selected by officers and former non-employee directors of BXP participating in the plans.

Unrealized Loss on Non-Real Estate Investment

During the year ended December 31, 2022, we began investing in non-real estate investments, which are primarily environmentally focused investment funds. As a result, we recognized an unrealized loss of $0.2 million due to the observable changes in the fair value of the investments.

Losses From Early Extinguishment of Debt

On February 14, 2021, BPLP completed the redemption of $850.0 million in aggregate principal amount of its 4.125% senior notes due May 15, 2021. The redemption price was approximately $858.7 million, which was equal to the stated principal plus approximately $8.7 million of accrued and unpaid interest to, but not including, the redemption date. We recognized a loss from early extinguishment of debt totaling approximately $0.4 million related to unamortized origination costs.

On March 16, 2021, BPLP repaid $500.0 million, representing all amounts outstanding on its delayed draw term loan facility (“Delayed Draw Facility”) under its prior unsecured revolving credit agreement. We recognized a loss from early extinguishment of debt totaling approximately $0.5 million related to the acceleration of remaining unamortized financing costs.

On October 15, 2021, BPLP used proceeds from its September 2021 offering of unsecured senior notes and borrowings under its new credit facility, which replaced the prior credit facility (as amended and restated, the “2021 Credit Facility”) to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion. The redemption price included approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was approximately 104.284% of the principal amount being redeemed. We recognized a loss from early extinguishment of debt totaling approximately $44.2 million, which amount included the payment of the redemption premium totaling approximately $42.8 million.

On December 10, 2021, the consolidated entity in which we have a 55% interest refinanced the mortgage loan collateralized by its 601 Lexington Avenue property located in New York City with a new lender. The mortgage loan has a principal amount of $1.0 billion, requires interest-only payments at a fixed interest rate of 2.79% per annum and matures on January 9, 2032. The previous mortgage loan had an outstanding balance of approximately $616.1 million, bore interest at a fixed rate of 4.75% per annum and was scheduled to mature on April 10, 2022. There was no prepayment penalty associated with the repayment of the previous mortgage loan. We recognized a loss from early extinguishment of debt totaling approximately $0.1 million due to the write-off of unamortized deferred financing costs.

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Interest Expense

Interest expense increased by approximately $13.8 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Component	Change in interest expense for the year ended December 31, 2022 compared to December 31, 2021
	(in thousands)
Increases to interest expense due to:
Increase in interest associated with unsecured credit facilities and term loans	$	19,592
Issuance of $850 million in aggregate principal of 2.450% senior notes due 2033 on September 29, 2021	15,521
Issuance of $750 million in aggregate principal of 6.750% senior notes due 2027 on November 17, 2022	6,197
Issuance of $850 million in aggregate principal of 2.550% senior notes due 2032 on March 16, 2021	4,577
Amortization expense of financing fees primarily related to the 2022 Unsecured Term Loan	2,525
Increase in interest due to finance lease for one in-service property	618
Decrease in capitalized interest related to development projects	545
Total increases to interest expense	49,575
Decreases to interest expense due to:
Redemption of $1.0 billion in aggregate principal of 3.85% senior notes due 2023 on October 15, 2021	(30,557)
Redemption of $850 million in aggregate principal of 4.125% senior notes due 2021 on February 14, 2021	(4,279)
Other interest expense (excluding senior notes)	(946)
Total decreases to interest expense	(35,782)
Total change in interest expense	$	13,793

Interest expense directly related to the development of rental properties is capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate or lease term. As portions of properties are placed in-service, we cease capitalizing interest on that portion and interest is then expensed. Interest capitalized for the years ended December 31, 2022 and 2021 was approximately $52.1 million and $53.1 million, respectively. These costs are not included in the interest expense referenced above.

We expect our interest expense will be materially greater in 2023 compared to 2022 due to the cessation of capitalized interest on our development deliveries, acquisitions funded by debt, higher interest rates on our floating rate debt, and the impact of refinancing our 2023 debt maturities at materially higher interest rates.

At December 31, 2022, our variable rate debt consisted of BPLP’s $1.5 billion revolving facility (the “Revolving Facility”) and BPLP’s $730.0 million 2022 Unsecured Term Loan. The Revolving Facility and 2022 Unsecured Term Loan had approximately $730.0 million outstanding as of December 31, 2022 (See Note 16 to the Consolidated Financial Statements). For a summary of our consolidated debt as of December 31, 2022 and 2021 refer to the heading “Liquidity and Capital Resources—Debt Financing” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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Noncontrolling Interests in Property Partnerships

Noncontrolling interests in property partnerships increased by approximately $4.1 million for the year ended December 31, 2022 compared to 2021, as detailed below.

Property	Noncontrolling Interests in Property Partnerships for the year ended December 31,
	2022		2021		Change
	(in thousands)
767 Fifth Avenue (the General Motors Building)	$	12,031	$	11,594	$	437
Times Square Tower	21,057		20,051		1,006
601 Lexington Avenue	13,865		14,897		(1,032)
100 Federal Street	13,341		12,158		1,183
Atlantic Wharf Office Building	14,563		12,106		2,457
	$	74,857	$	70,806	$	4,051

Noncontrolling Interest—Common Units of the Operating Partnership

For BXP, noncontrolling interest—common units of the Operating Partnership increased by approximately $40.8 million for the year ended December 31, 2022 compared to 2021 due primarily to an increase in allocable income, which was the result of recognizing a greater gain on sales of real estate amount during 2022. Due to our ownership structure, there is no corresponding line item on BPLP’s financial statements.

Preferred Stock/Unit Redemption Charge

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of its 5.25% Series B Cumulative Redeemable Preferred Stock (“Series B Preferred Stock”), which constituted all of the outstanding Series B Preferred Stock, and the corresponding depositary shares, each representing 1/100th of a share of Series B Preferred Stock (the “Depositary Shares”). In connection with the redemption of the Series B Preferred Stock, all of the Series B Preferred Units, which had terms and preferences generally mirroring those of the Series B Preferred Stock, were redeemed by BPLP. The redemption price per share of Series B Preferred Stock was $2,500, plus all accrued and unpaid dividends to, but not including, the redemption date, totaling $2,516.41 per share. On March 31, 2021, we transferred the full redemption price for all outstanding shares of Series B Preferred Stock of approximately $201.3 million, including approximately $1.3 million of accrued and unpaid dividends to, but not including, the redemption date, to the redemption agent. The excess of the redemption price over the carrying value of the Series B Preferred Stock and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. common shareholders and Net Income Attributable to Boston Properties Limited Partnership common unitholders on the Consolidated Income Statement.

Liquidity and Capital Resources

General

Our principal liquidity needs for the next twelve months and beyond are to:

•fund normal recurring expenses;

•meet debt service and principal repayment obligations and balloon payments on maturing debt, Including the $500 million of 3.125% unsecured senior notes maturing September 1, 2023;

•fund development and redevelopment costs;

•fund capital expenditures, including major renovations, tenant improvements and leasing costs;

•fund pending and possible acquisitions of properties, either directly or indirectly through the acquisition of equity interests therein; and

•make the minimum distribution required to enable BXP to maintain its REIT qualification under the Internal Revenue Code of 1986, as amended.

We expect to satisfy these needs using one or more of the following:

•cash flow from operations;

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•distribution of cash flows from joint ventures;

•cash and cash equivalent balances;

•borrowings under BPLP’s Revolving Facility, unsecured term loans, short-term bridge facilities and construction loans;

•long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness);

•sales of real estate and interests in joint ventures owning real estate;

•private equity sources, including through our Strategic Capital Program (“SCP”) with large institutional investors; and

•issuances of BXP equity securities and/or preferred or common units of partnership interests in BPLP.

We draw on multiple financing sources to fund our long-term capital needs. We expect to fund our current development/redevelopment properties primarily with our available cash balances, construction loans, unsecured term loans, proceeds from asset sales and BPLP’s Revolving Facility. We use BPLP’s Revolving Facility primarily as a bridge facility to fund acquisition opportunities, refinance outstanding indebtedness and meet short-term development and working capital needs. Although we may seek to fund our development projects with construction loans, which may require guarantees by BPLP, the financing for each particular project ultimately depends on several factors, including, among others, the project’s size and duration, the extent of pre-leasing, our available cash and access to cost effective capital at the given time.

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The following table presents information on properties under construction/redevelopment as of December 31, 2022 (dollars in thousands):

									Financings
Construction/Redevelopment Properties	Estimated Stabilization Date	Location	# of Buildings	Estimated Square Feet	Investment to Date (1)(2)(3)		Estimated Total Investment (1)(2)		Total Available (1)		Outstanding at December 31, 2022 (1)		Estimated Future Equity Requirement (1)(2)(4)		Percentage Leased (5)
Office
140 Kendrick - Building A (Redevelopment)	Third Quarter, 2023	Needham, MA	1	104,000	$	7,995	$	26,600	$	—	$	—	$	18,605	100	%
2100 Pennsylvania Avenue	Third Quarter, 2024	Washington, DC	1	480,000	315,966		356,100		—		—		40,134		84	%	(6)
360 Park Avenue South (42% ownership)	First Quarter, 2025	New York, NY	1	450,000	203,545		219,000		92,774		88,164		10,845		—	%	(7)
Reston Next Office Phase II	Second Quarter, 2025	Reston, VA	1	90,000	22,954		61,000		—		—		38,046		—	%
Platform 16 Building A (55% ownership)	Fourth Quarter, 2026	San Jose, CA	1	389,500	85,471		231,900		—		—		146,429		—	%	(8)
Total Office Properties under Construction/Redevelopment			5	1,513,500	635,931		894,600		92,774		88,164		254,059		34	%
Laboratory/Life Sciences
751 Gateway (49% ownership)	Second Quarter, 2024	South San Francisco, CA	1	231,000	87,847		127,600		—		—		39,753		100	%
103 CityPoint	Third Quarter, 2024	Waltham, MA	1	113,000	44,678		115,100		—		—		70,422		—	%
190 CityPoint (formerly 180 CityPoint)	Fourth Quarter, 2024	Waltham, MA	1	329,000	143,389		274,700		—		—		131,311		43	%
105 Carnegie Center (Redevelopment)	First Quarter, 2025	Princeton, NJ	1	73,000	631		40,600		—		—		39,969		—	%
651 Gateway (50% ownership) (Redevelopment)	Fourth Quarter, 2025	South San Francisco, CA	1	327,000	44,648		146,500		—		—		101,852		7	%
Total Laboratory/Life Sciences Properties under Construction/Redevelopment			5	1,073,000	321,193		704,500		—		—		383,307		37	%
Residential
Reston Next Residential (508 units) (20% ownership)	Second Quarter, 2026	Reston, VA	1	417,000	11,451		47,700		28,000		3,037		11,286		—	%
Total Residential Properties under Construction			1	417,000	11,451		47,700		28,000		3,037		11,286		—
Retail
760 Boylston Street (Redevelopment)	Second Quarter, 2024	Boston, MA	1	118,000	3,071		43,800		—		—		40,729		100	%
Reston Next Retail	Fourth Quarter, 2025	Reston, VA	1	33,000	17,198		26,600		—		—		9,402		—	%	(9)
Total Retail Properties under Construction/Redevelopment			2	151,000	20,269		70,400		—		—		50,131		78	%
Other
View Boston Observatory at The Prudential Center (Redevelopment)	N/A	Boston, MA	—	59,000	151,999		182,300		—		—		30,301		N/A		(10)
Total Properties under Construction/Redevelopment			13	3,213,500	$	1,140,843	$	1,899,500	$	120,774	$	91,201	$	729,084	37	%	(11)

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___________  

(1)Represents our share.

(2)Each of Investment to Date, Estimated Total Investment and Estimated Future Equity Requirement represent our share of acquisition expenses, as applicable, and reflect our share of the estimated net revenue/expenses that we expect to incur prior to stabilization of the project, including any amounts actually received or paid through December 31, 2022.

(3)Includes approximately $76.9 million of unpaid but accrued construction costs and leasing commissions.

(4)Excludes approximately $76.9 million of unpaid but accrued construction costs and leasing commissions.

(5)Represents percentage leased as of February 21, 2023, including leases with future commencement dates.

(6)The property was 64% placed in-service as of December 31, 2022.

(7)Investment to Date includes all related costs incurred prior to the contribution of the property by us to the joint venture on December 15, 2021 totaling approximately $107 million and our proportionate share of the loan. Our joint venture partners will fund required capital until their aggregate investment is approximately 58% of all capital contributions; thereafter, the joint venture partners will fund required capital according to their percentage interests.

(8)Estimated total investment represents the costs to complete Building A, a 389,500 square foot building, and Building A’s proportionate share of land and garage costs. In conjunction with the construction of Building A, garage and site work will be completed for Phase II, which will support approximately 700,000 square feet of development in two office buildings, budgeted to be an incremental $141 million.

(9)Reston Next Retail was previously included within the Reston Next project.

(10)We expect to place this project in-service and open to the public in the second quarter of 2023.

(11)Percentage leased excludes the residential property and the View Boston Observatory at The Prudential Center (redevelopment) at 800 Boylston Street - The Prudential Center. Estimated total investment excludes approximately $1.2 billion related to the development of 290 Binney Street and approximately $210 million related to the redevelopment of 300 Binney Street which was still in-service at December 31, 2022. We terminated our existing lease agreement with a client at 300 Binney Street to facilitate the redevelopment of the property, which commenced in January 2023. 290 Binney Street and 300 Binney Street are 100% pre-leased. See Note 16 to the Consolidated Financial Statements.

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Lease revenue (which includes recoveries from clients), other income from operations, available cash balances, mortgage financings, unsecured indebtedness and draws on BPLP’s Revolving Facility are the principal sources of capital that we use to fund operating expenses, debt service, maintenance and repositioning capital expenditures, tenant improvements and the minimum distribution required to enable BXP to maintain its REIT qualification. We seek to maximize income from our existing properties by maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing client turnover and controlling operating expenses. Our sources of revenue also include third-party fees generated by our property management, leasing, development and construction businesses, as well as the sale of assets from time to time. We believe these sources of capital will continue to provide the funds necessary for our short-term liquidity needs. Material adverse changes in one or more sources of capital may adversely affect our net cash flows.

We expect our primary uses of capital over the next twelve months will be to fund the continuation and completion of our current and committed development and redevelopment projects, repay debt maturities (as discussed below), service the interest payments on our outstanding indebtedness, and satisfy our REIT distribution requirements.

As of December 31, 2022, we had 13 properties under development or redevelopment. Our share of the estimated total cost for these projects is approximately $1.9 billion, of which approximately $729.1 million remains to be funded with equity through 2026. In the fourth quarter of 2022, we commenced the redevelopment of 105 Carnegie Center in Princeton, New Jersey. 105 Carnegie Center is an approximately 70,000 net rentable square feet property that will be converted into an approximately 73,000 square foot laboratory/life sciences property for an approximate cost of $40.6 million.

In January 2023, we added the following new projects to our active development and redevelopment portfolio (see Note 16 to the Consolidated Financial Statements):

•290 Binney Steet in Cambridge, Massachusetts, an approximately 566,000 net rentable square foot laboratory/life sciences project. The project has a total budget of approximately $1.2 billion and is expected to be completed in 2026. The project is 100% pre-leased to AstraZeneca.

•300 Binney Street in Cambridge, Massachusetts. The conversion of this approximately 195,000 net rentable square foot property into an approximately 240,000 net rentable square foot laboratory/life sciences property has a total budgeted cost of $210.0 million. This project is 100% pre-leased.

As of February, 21, 2023, we had 15 properties under development or redevelopment. Our share of the estimated total cost for these projects is approximately $3.3 billion.

On November 17, 2022, we acquired a 26.69% interest in the joint venture that owns 200 Fifth Avenue for a gross purchase price of approximately $280.2 million, which include $120.1 million of cash and our pro rata share of the outstanding loan secured by the property of $160.1 million. 200 Fifth Avenue is a 14-story, approximately 855,000 square foot LEED Gold certified, premier workplace located in the Midtown South submarket of Manhattan, New York. The property was 93% leased as of December 31, 2022.

In the fourth quarter of 2022, we completed the sale of the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141.0 million. The Avant is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury multifamily property.

Aggregating our pro rata share of 2022 capital markets activity, we purchased properties or interests in joint ventures that own property of approximately $1.6 billion, sold properties or parcels of land for gross sales prices of approximately $864.2 million, commenced development and redevelopment projects, including projects that commenced in the first quarter of 2023, of approximately $2.0 billion and completed approximately $1.8 billion of debt financing.

In July 2021, we announced the formation of the SCP with two partners each having a targeted equity commitment of $1.0 billion and a $250 million commitment from us. Under this agreement, we agreed to provide these partners, for up to two years, exclusive first offers to form joint ventures with us to invest in assets that meet target criteria. All investments are discretionary to each partner.

The SCP provides us the opportunity to partner with large institutional investors and capitalize our investment opportunities partially through private equity. The SCP enhances our access to capital and investment capacity, enhances our returns through fee income, and in some investments provides us the opportunity to realize a greater

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share of income upon achieving certain success criteria. These large financial partners are among the world’s largest sovereign wealth funds and pension plans. As we move forward, we anticipate increasing our use of joint venture partner equity to manage our debt levels.

On January 4, 2023, we entered into a credit agreement that provided for a $1.2 billion unsecured term loan facility (the “2023 Unsecured Term Loan”). Under the credit agreement, we may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions. Upon entry into the credit agreement, we borrowed the full $1.2 billion available under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the 2022 Unsecured Term Loan, which was scheduled to mature on May 16, 2023.

After repayment of the $730.0 million 2022 Unsecured Term Loan on January 4, 2023, our remaining 2023 and 2024 debt maturities include (1) $500.0 million aggregate principal amount of BPLP’s 3.125% senior unsecured notes, which mature on September 1, 2023, (2) $700.0 million aggregate principal amount of BPLP’s 3.800% senior unsecured notes, which mature on February 1, 2024 and (3) the $1.2 billion 2023 Unsecured Term Loan. In our unconsolidated joint venture portfolio, we have approximately $603.2 million (our share) of debt maturating in 2023 and 2024. We expect to fund 2023 and 2024 debt maturities using available cash balances, proceeds from asset sales, draws on BPLP’s Revolving Facility, and/or through refinancings. We expect our interest expense will be materially greater in 2023 compared to 2022 due to the cessation of capitalized interest on our development deliveries, acquisitions funded by debt, higher interest rates on our floating rate debt, and the impact of refinancing our 2023 debt maturities at materially higher interest rates.

As of February 21, 2023, we had available cash of approximately $833.3 million (of which approximately $79.9 million is attributable to our consolidated joint venture partners). Our liquidity and capital resources depend on a wide range of factors and we believe that our access to capital and our strong liquidity, including the approximately $1.5 billion available under the Revolving Facility and our available cash, as of February 21, 2023, are sufficient to fund our remaining capital requirements on existing development and redevelopment projects, fund acquisitions, repay our maturing indebtedness when due (if not refinanced), satisfy our REIT distribution requirements and still allow us to act opportunistically on attractive investment opportunities.

We may seek to enhance our liquidity to fund our current and future development activity, pursue additional attractive investment opportunities and refinance or repay indebtedness. Depending on interest rates, the overall conditions in the debt and public and private equity markets, and our leverage at the time, we may decide to access one or more of these capital sources (including utilization of BXP’s $600.0 million “at the market” equity offering program). Doing so may result in us carrying additional cash and cash equivalents pending our use of the proceeds, which could increase our net interest expense or be dilutive to our earnings, or both.

We have not sold any shares under BXP’s $600.0 million “at the market” equity offering program.

Inflation 

We are exposed to inflation risk, as income from long-term leases is the primary source of our cash flows from operations. There are provisions in the majority of our client leases that protect us from, and mitigate the risk of, the impact of inflation. These provisions include rent steps and resets to market, reimbursement billings for operating expense pass-through charges, real estate tax and insurance reimbursements on a per-square-foot basis, or in some cases, annual reimbursement of operating expenses above a certain per-square-foot allowance. However, due to the long-term nature of the leases, the rent may not increase frequently enough to fully cover inflation.

REIT Tax Distribution Considerations

Dividend

BXP as a REIT is subject to a number of organizational and operational requirements, including a requirement that BXP currently distribute at least 90% of its annual taxable income (excluding capital gains and with certain other adjustments). Our policy is for BXP to distribute at least 100% of its taxable income, including capital gains, to avoid paying federal tax. Common and LTIP unitholders (other than unearned MYLTIP units) of limited partnership interest in BPLP receive the same total distribution per unit.

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BXP’s Board of Directors will continue to evaluate BXP’s dividend rate in light of our actual and projected taxable income (including gains on sales), liquidity requirements and other circumstances and there can be no assurance that the future dividends declared by BXP’s Board of Directors will not differ materially from the current quarterly dividend amount.

Sales

To the extent that we sell assets at a gain and cannot efficiently use the proceeds in a tax deferred manner for either our development activities or attractive acquisitions, BXP would, at the appropriate time, decide whether it is better to declare a special dividend, adopt a stock repurchase program, reduce indebtedness or retain the cash for future investment opportunities. Such a decision will depend on many factors including, among others, the timing, availability and terms of development and acquisition opportunities, our then-current and anticipated leverage, the cost and availability of capital from other sources, the price of BXP’s common stock and REIT distribution requirements. At a minimum, we expect that BXP would distribute at least that amount of proceeds necessary for BXP to avoid paying corporate level tax on the applicable gains realized from any asset sales.

From time to time in select cases, whether due to a change in use, structuring issues to comply with applicable REIT regulations or other reasons, we may sell an asset that is held by a taxable REIT subsidiary (“TRS”). Such a sale by a TRS would be subject to federal and local taxes.

Cash Flow Summary

The following summary discussion of our cash flows is based on the Consolidated Statements of Cash Flows and is not meant to be an all-inclusive discussion of the changes in our cash flows for the periods presented below.

Cash and cash equivalents and cash held in escrows aggregated approximately $736.8 million and $501.2 million at December 31, 2022 and 2021, respectively, representing an increase of approximately $235.7 million. The following table sets forth changes in cash flows:

	Year ended December 31,
	2022		2021		Change
	(in thousands)
Net cash provided by operating activities	$	1,282,399	$	1,133,227	$	149,172
Net cash used in investing activities	(1,602,802)		(1,039,956)		(562,846)
Net cash provided by (used in) financing activities	556,057		(1,311,442)		1,867,499

Our principal source of cash flow is related to the operation of our properties. The weighted-average term of our in-place leases, including leases signed by our unconsolidated joint ventures, excluding residential units, was approximately 7.9 years as of December 31, 2022, with occupancy rates historically in the range of 88% to 94%. Generally, our properties generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund regular quarterly dividend and distribution payment requirements. In addition, over the past several years, we have raised capital through the sale of some of our properties and through secured and unsecured borrowings.

Cash is used in investing activities to fund acquisitions, development, net investments in unconsolidated joint ventures and maintenance and repositioning capital expenditures. We selectively invest in new projects that enable us to take advantage of our development, leasing, financing and property management skills and invest in existing buildings to enhance or maintain our market position. Cash used in investing activities for the years ended December 31, 2022 and December 31, 2021 is detailed below:

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	Year ended December 31,
	2022		2021
	(in thousands)
Acquisitions of real estate (1)	$	(1,320,273)	$	(222,260)
Construction in progress (2)	(500,273)		(513,878)
Building and other capital improvements	(177,004)		(150,998)
Tenant improvements	(218,685)		(263,952)
Proceeds from the sales of real estate (3)	834,770		179,887
Proceeds from assignment fee (4)	6,624		—
Capital contributions to unconsolidated joint ventures (5)	(277,581)		(98,152)
Capital distributions from unconsolidated joint ventures (6)	37,122		122
Proceeds from sale of investment in unconsolidated joint venture (7)	—		17,789
Investment in non-real estate investments	(2,404)		—
Proceeds from note receivable (8)	10,000		10,035
Investments in securities, net	4,902		1,451
Net cash used in investing activities	$	(1,602,802)	$	(1,039,956)

Cash used in investing activities changed primarily due to the following:

(1)On September 16, 2022, we acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s Revolving Facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property.

On May 17, 2022, we completed the acquisition of Madison Centre in Seattle, Washington, for an aggregate purchase price, including transaction costs, of approximately $724.3 million. Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace.

On August 2, 2021, we acquired Shady Grove Innovation District in Rockville, Maryland, for a purchase price, including transaction costs, of approximately $118.5 million in cash. Shady Grove Innovation District is an approximately 435,000 net rentable square foot, seven-building office park situated on an approximately 31-acre site. We anticipate we will redevelop or convert Shady Grove Innovation District to support lab or life sciences-related uses.

On June 2, 2021, we acquired 153 & 211 Second Avenue located in Waltham, Massachusetts for a purchase price of approximately $100.2 million in cash. 153 & 211 Second Avenue consists of two life sciences lab buildings totaling approximately 137,000 net rentable square feet.

(2)Construction in progress for the year ended December 31, 2022 included ongoing expenditures associated with 2100 Pennsylvania Avenue, which was partially placed in-service, and 325 Main Street, 880 Winter Street and Reston Next, which were completed and fully placed in-service during the year ended December 31, 2022. In addition, we incurred costs associated with our continued development/redevelopment of 190 CityPoint (formerly 180 CityPoint), View Boston Observatory at The Prudential Center, 103 CityPoint, Reston Next Office Phase II, 140 Kendrick Street Building A, 760 Boylston Street and 105 Carnegie Center.

Construction in progress for the year ended December 31, 2021 includes ongoing expenditures associated with One Five Nine East 53rd Street, which was completed and fully placed in-service during the year ended December 31, 2021. In addition, we incurred costs associated with our continued development/redevelopment of 200 West Street, 325 Main Street, 2100 Pennsylvania Avenue, Reston Next, 190 CityPoint (formerly 180 CityPoint), View Boston Observatory at The Prudential Center and 880 Winter Street.

(3)On November 8, 2022, we completed the sale of the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141.0 million. Net cash proceeds totaled approximately $139.6 million, resulting in a gain on sale of real estate of approximately $55.6 million for BXP and BPLP. The Avant at Reston Town Center is a 15-story, 359-unit, luxury multifamily building

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consisting of approximately 329,000 net rentable square feet, excluding retail space. We retained ownership of the approximately 26,000 square foot ground-level retail space.

On September 15, 2022, we completed the sale of two parcels of land located in Loudoun County, Virginia for a gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

On August 30, 2022, we completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace.

On June 15, 2022, we completed the sale of our Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet.

On March 31, 2022, we completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property.

On October 25, 2021, we completed the sale of our 181,191 and 201 Spring Street properties located in Lexington, Massachusetts for an aggregate gross sales price of $191.5 million. Net cash proceeds totaled approximately $179.9 million, resulting in a gain on sale of real estate totaling approximately $115.6 million for BXP and approximately $117.1 million for BPLP. 181,191 and 201 Spring Street are three Class A office properties aggregating approximately 333,000 net rentable square feet.

(4)On April 19, 2021, we entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, we executed an agreement to assign the right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

(5)Capital contributions to unconsolidated joint ventures for the year ended December 31, 2022 consisted primarily of cash contributions of approximately $120.8 million, $56.9 million, $45.2 million and $24.7 million to our 200 Fifth Avenue, Gateway Commons, Platform 16 and 751 Gateway joint ventures, respectively. On November 17, 2022, we entered into a new joint venture for 200 Fifth Avenue located in New York, New York.

Capital contributions to unconsolidated joint ventures for the year ended December 31, 2021 consisted primarily of cash contributions of approximately $73.0 million and $11.4 million to our Safeco Plaza and Santa Monica Business Park joint ventures, respectively. On September 1, 2021, we entered into a new joint venture for Safeco Plaza located in Seattle, Washington.

(6)Capital distributions from unconsolidated joint ventures for the year ended December 31, 2022 consisted primarily of cash distributions totaling approximately $21.6 million and $11.6 million from our Metropolitan Square and 7750 Wisconsin Avenue joint ventures, respectively.

(7)On March 30, 2021, we completed the sale of our 50% ownership interest in Annapolis Junction NFM LLC to the joint venture partner for a gross sale price of $65.9 million. Net cash proceeds to us totaled approximately $17.8 million after repayment of our share of debt totaling approximately $15.1 million.

(8)We invest in a non-real estate fund, which is primarily an environmentally focused investment fund, with an aggregate commitment to contribute $10.0 million. As of December 31, 2022, we have contributed $2.4 million, which includes required fees, with $7.8 million remaining to be contributed.

(9)An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from us, and we provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base

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building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest.

Proceeds from note receivable consists of the final repayment of a note receivable provided by us to the     buyer in connection with the sale of land at our Tower Oaks property located in Rockville, Maryland, which was collateralized by a portion of the land parcel, bore interest at an effective rate of 1.92% per annum and matured on December 20, 2021.

Cash provided by financing activities for the year ended December 31, 2022 totaled approximately $556.1 million. This amount consisted primarily of borrowings under BPLP’s Revolving Facility and 2022 Unsecured Term Loan and the proceeds from the issuance by BPLP of $750 million in aggregate principal amount of its 6.75% unsecured senior notes due 2027, partially offset by the payment of our regular dividends and distributions to our shareholders and unitholders and distributions to noncontrolling interests in property partnerships. Future debt payments are discussed below under the heading “Debt Financing.”

Capitalization

The following table presents Consolidated Market Capitalization and BXP’s Share of Market Capitalization, as well as the corresponding ratios of Consolidated Debt to Consolidated Market Capitalization and BXP’s Share of Debt to BXP’s Share of Market Capitalization (in thousands except for percentages):

	December 31, 2022
	Shares / Units Outstanding	Common Stock Equivalent	Equivalent Value (1)
Common Stock	156,758	156,758	$	10,593,706
Common Operating Partnership Units	18,210	18,210	1,230,632			(2)
Total Equity		174,968	$	11,824,338
Consolidated Debt			$	14,240,336
Add:
BXP’s share of unconsolidated joint venture debt (3)			1,600,367
Subtract:
Partners’ share of Consolidated Debt (4)			(1,358,395)
BXP’s Share of Debt			$	14,482,308
Consolidated Market Capitalization			$	26,064,674
BXP’s Share of Market Capitalization			$	26,306,646
Consolidated Debt/Consolidated Market Capitalization			54.63		%
BXP’s Share of Debt/BXP’s Share of Market Capitalization			55.05		%

_______________  

(1)Values are based on the closing price per share of BXP’s Common Stock on the New York Stock Exchange on December 30, 2022 of $67.58.

(2)Includes long-term incentive plan units (including 2012 OPP Units and 2013 - 2019 MYLTIP Units) but excludes the 2020 - 2022 MYLTIP Units because the three-year performance periods had not ended as of December 31, 2022.

(3)See page 95 for additional information.

(4)See page 94 for additional information.

Consolidated Debt to Consolidated Market Capitalization Ratio is a measure of leverage commonly used by analysts in the REIT sector. We present this measure as a percentage and it is calculated by dividing (A) our consolidated debt by (B) our consolidated market capitalization, which is the market value of our outstanding equity securities plus our consolidated debt. Consolidated market capitalization is the sum of:

(1)     our consolidated debt; plus

(2)     the product of (x) the closing price per share of BXP Common Stock on December 31, 2022, as reported by the New York Stock Exchange, multiplied by (y) the sum of:

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(i)     the number of outstanding shares of Common Stock of BXP,

(ii)     the number of outstanding OP Units in BPLP (excluding OP Units held by BXP),

(iii)     the number of OP Units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, and

(iv)     the number of OP Units issuable upon conversion of 2012 OPP Units, and 2013 - 2019 MYLTIP Units that were issued in the form of LTIP Units.

The calculation of consolidated market capitalization does not include LTIP Units issued in the form of MYLTIP Awards unless and until certain performance thresholds are achieved and they are earned. Because their three-year performance periods have not yet ended, 2020 - 2022 MYLTIP Units are not included in this calculation as of December 31, 2022.

We also present BXP’s Share of Market Capitalization and BXP’s Share of Debt/BXP’s Share of Market Capitalization, which are calculated in the same manner, except that BXP’s Share of Debt is utilized instead of our consolidated debt in both the numerator and the denominator. BXP’s Share of Debt is defined as our consolidated debt plus our share of debt from our unconsolidated joint ventures (calculated based upon our ownership percentage), minus our partners’ share of debt from our consolidated joint ventures (calculated based upon the partners’ percentage ownership interests adjusted for basis differentials). Management believes that BXP’s Share of Debt provides useful information to investors regarding our financial condition because it includes our share of debt from unconsolidated joint ventures and excludes our partners’ share of debt from consolidated joint ventures, in each case presented on the same basis. We have several significant joint ventures and presenting various measures of financial condition in this manner can help investors better understand our financial condition and/or results of operations after taking into account our economic interest in these joint ventures.  We caution investors that the ownership percentages used in calculating BXP’s Share of Debt may not completely and accurately depict all of the legal and economic implications of holding an interest in a consolidated or unconsolidated joint venture. For example, in addition to partners’ interests in profits and capital, venture agreements vary in the allocation of rights regarding decision making (both for routine and major decisions), distributions, transferability of interests, financing and guarantees, liquidations and other matters.  Moreover, in some cases we exercise significant influence over, but do not control, the joint venture in which case GAAP requires that we account for the joint venture entity using the equity method of accounting and we do not consolidate it for financial reporting purposes. In other cases, GAAP requires that we consolidate the venture even though our partner(s) own(s) a significant percentage interest.  As a result, management believes that the presentation of BXP’s Share of a financial measure should not be considered a substitute for, and should only be considered with and as a supplement to our financial information presented in accordance with GAAP.

We present these supplemental ratios because our degree of leverage could affect our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes and because different investors and lenders consider one or both of these ratios. Investors should understand that these ratios are, in part, a function of the market price of the common stock of BXP and as such will fluctuate with changes in such price, and they do not necessarily reflect our capacity to incur additional debt to finance our activities or our ability to manage our existing debt obligations. However, for a company like BXP, whose assets are primarily income-producing real estate, these ratios may provide investors with an alternate indication of leverage, so long as they are evaluated along with the ratio of indebtedness to other measures of asset value used by financial analysts and other financial ratios, as well as the various components of our outstanding indebtedness.

For a discussion of our unconsolidated joint venture indebtedness, see “Liquidity and Capital Resources—Investment in Unconsolidated Joint Ventures - Secured Debt” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations” and for a discussion of our consolidated joint venture indebtedness see “Liquidity and Capital Resources—Mortgage Notes Payable” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Debt Financing

As of December 31, 2022, we had approximately $14.2 billion of outstanding consolidated indebtedness, representing approximately 54.63% of our Consolidated Market Capitalization as calculated above consisting of approximately (1) $10.2 billion (net of discount and deferred financing fees) in publicly traded unsecured senior

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notes having a GAAP weighted-average interest rate of 3.69% per annum and maturities in 2023 through 2033, (2) $3.3 billion (net of deferred financing fees) of property-specific mortgage debt having a GAAP weighted-average interest rate of 3.42% per annum and a weighted-average term of 5.8 years and (3) $730.0 million outstanding under BPLP’s 2022 Unsecured Term Loan that was scheduled to mature on May 16, 2023 and was repaid subsequent to December 31, 2022 (See Notes 7 and 16 to the Consolidated Financial Statements).

The table below summarizes the aggregate carrying value of our mortgage notes payable and BPLP’s unsecured senior notes, line of credit, and unsecured term loan, as well as Consolidated Debt Financing Statistics at December 31, 2022 and December 31, 2021.  

	December 31,
	2022			2021
	(dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable, net	$	3,272,368		$	3,267,914
Unsecured senior notes, net	10,237,968			9,483,695
Unsecured line of credit	—			145,000
Unsecured term loan, net	730,000			—
Consolidated Debt	14,240,336			12,896,609
Add:
BXP’s share of unconsolidated joint venture debt, net (1)	1,600,367			1,383,887
Subtract:
Partners’ share of consolidated mortgage notes payable, net (2)	(1,358,395)			(1,356,579)
BXP’s Share of Debt	$	14,482,308		$	12,923,917
	December 31,
	2022			2021
Consolidated Debt Financing Statistics:
Percent of total debt:
Fixed rate	94.87		%	98.88		%
Variable rate	5.13		%	1.12		%
Total	100.00		%	100.00		%
GAAP Weighted-average interest rate at end of period:
Fixed rate	3.62		%	3.43		%
Variable rate	4.85		%	0.98		%
Total	3.69		%	3.40		%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate	3.51		%	3.32		%
Variable rate	4.85		%	0.87		%
Total	3.58		%	3.29		%
Weighted-average maturity at end of period (in years):
Fixed rate	5.6			6.6
Variable rate	0.4			4.5
Total	5.3			6.6

_______________

(1)See page 95 for additional information.

(2)See page 94 for additional information.

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Unsecured Credit Facility

On June 15, 2021, BPLP amended and restated its prior credit facility (as amended and restated, the “2021 Credit Facility”). The 2021 Credit Facility provides for borrowings of up to $1.5 billion through the Revolving Facility, subject to customary conditions. Among other things, the 2021 Credit Facility (1) extended the maturity date from April 24, 2022 to June 15, 2026, (2) eliminated the $500.0 million delayed draw facility (3) reduced the per annum variable interest rates on borrowings and (4) added a sustainability-linked pricing component. Under the 2021 Credit Facility, BPLP may increase the total commitment by up to $500.0 million by increasing the amount of the Revolving Facility and/or by incurring one or more term loans, in each case, subject to syndication of the increase and other conditions. Based on BPLP’s December 31, 2022 credit rating, (1) the applicable Eurocurrency and LIBOR Daily Floating Rate margins are 0.775%, (2) the alternate base rate margin is zero basis points and (3) the facility fee is 0.15% per annum. The 2021 Credit Facility includes provisions which allow LIBOR Daily Floating Rate to be switched to SOFR.

At December 31, 2022 and February 21, 2023, BPLP had no borrowings under its Revolving Facility and outstanding letters of credit totaling approximately $6.4 million, with the ability to borrow approximately $1.5 billion.

Unsecured Term Loans

On May 17, 2022, BPLP entered into the 2022 Unsecured Term Loan, which provided for a single borrowing of up to $730.0 million. The 2022 Unsecured Term Loan was scheduled to mature on May 16, 2023.

At BPLP’s option, the 2022 Unsecured Term Loan bore interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate was unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the 2022 Unsecured Term Loan (See Notes 3 and 7 to the Consolidated Financial Statements). As of December 31, 2022, the 2022 Unsecured Term Loan bore interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s credit rating at December 31, 2022. At December 31, 2022, BPLP had $730.0 million outstanding under its 2022 Unsecured Term Loan. The 2022 Unsecured Term Loan was repaid in full on January 4, 2023 with proceeds from the credit agreement entered into on that date (the 2023 Unsecured Term Loan) as further discussed below.

On January 4, 2023, BPLP entered into the 2023 Unsecured Term Loan, which provided for a single borrowing of up to $1.2 billion. Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions.

At BPLP’s option, the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 1/2 of 1%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating.

On January 4, 2023, upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the 2022 Unsecured Term Loan, which was scheduled to mature on May 16, 2023. Based on the BPLP’s credit rating upon entry into the credit agreement, the base rate margin is zero basis points and the Term SOFR margin is 85 basis points.

Unsecured Senior Notes

For a description of BPLP’s outstanding unsecured senior notes as of December 31, 2022, see Note 7 to the

Consolidated Financial Statements.

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On November 17, 2022, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.750% unsecured senior notes due 2027. The notes were priced at 99.941% of the principal amount to yield an effective rate (including financing fees) of approximately 6.924% per annum to maturity. The notes will mature on December 1, 2027, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $743.5 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2022, BPLP was in compliance with each of these financial restrictions and requirements.

Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at December 31, 2022:

Properties	Stated Interest Rate		GAAP Interest Rate (1)		Stated Principal Amount		Deferred Financing Costs, Net		Carrying Amount		Carrying Amount (Partners’ Share)			Maturity Date
	(dollars in thousands)
Consolidated Joint Ventures
767 Fifth Avenue (the General Motors Building)	3.43	%	3.64	%	$	2,300,000	$	(15,490)	$	2,284,510	$	913,859	(2)(3)(4)	June 9, 2027
601 Lexington Avenue	2.79	%	2.93	%	1,000,000		(12,142)		987,858		444,536		(2)(5)	January 9, 2032
Total					$	3,300,000	$	(27,632)	$	3,272,368	$	1,358,395

_______________ 

(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges and the effects of hedging transactions (if any).

(2)The mortgage loan requires interest only payments with a balloon payment due at maturity.

(3)This property is owned by a consolidated entity in which we have a 60% interest. The partners’ share of the carrying amount has been adjusted for basis differentials.

(4)In connection with the refinancing of the loan, we guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of December 31, 2022, the maximum funding obligation under the guarantee was approximately $13.7 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee (See Note 8 to the Consolidated Financial Statements).

(5)This property is owned by a consolidated entity in which we have a 55% interest.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2022 are as follows:

	Principal Payments
Year	(in thousands)
2023	$	—
2024	—
2025	—
2026	—
2027	2,300,000
Thereafter	1,000,000
	$	3,300,000

Investment in Unconsolidated Joint Ventures - Secured Debt

We have investments in unconsolidated joint ventures with our effective ownership interests ranging from 20% to 55%. Seventeen of these ventures have mortgage indebtedness. We exercise significant influence over, but do not control, these entities. As a result, we account for them using the equity method of accounting. See also Note 6 to the Consolidated Financial Statements. At December 31, 2022, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $4.0 billion (of which our

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proportionate share is approximately $1.6 billion). The table below summarizes the outstanding debt of these joint venture properties at December 31, 2022. In addition to other guarantees specifically noted in the table, we have agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) as well as the completion of development projects on certain of the loans. 

Properties	Nominal % Ownership		Stated Interest Rate		GAAP Interest Rate (1)		Stated Principal Amount		Deferred Financing Costs, Net		Carrying Amount		Carrying Amount (Our share)			Maturity Date
	(dollars in thousands)
Santa Monica Business Park	55.00	%	4.06	%	4.24	%	$	300,000	$	(1,350)	$	298,650	$	164,258	(2)(3)	July 19, 2025
Market Square North	50.00	%	6.11	%	6.29	%	125,000		(655)		124,345		62,173		(2)(4)	November 10, 2025
1265 Main Street	50.00	%	3.77	%	3.84	%	35,585		(250)		35,335		17,668			January 1, 2032
Colorado Center	50.00	%	3.56	%	3.59	%	550,000		(826)		549,174		274,587		(2)	August 9, 2027
Dock 72	50.00	%	6.93	%	7.19	%	198,383		(1,403)		196,980		98,490		(2)(5)	December 18, 2025
The Hub on Causeway - Podium	50.00	%	6.18	%	6.35	%	174,329		(213)		174,116		87,058		(2)(6)	September 6, 2023
Hub50House	50.00	%	4.43	%	4.51	%	185,000		(1,290)		183,710		91,854		(2)(7)	June 17, 2032
100 Causeway Street	50.00	%	5.17	%	5.38	%	337,604		(580)		337,024		168,512		(2)(8)	September 5, 2023
7750 Wisconsin Avenue (Marriott International Headquarters)	50.00	%	4.90	%	5.44	%	251,542		(464)		251,078		125,539		(2)(9)	April 26, 2023
360 Park Avenue South	42.21	%	6.31	%	6.77	%	209,082		(1,957)		207,125		87,427		(2)(10)	December 14, 2024
Safeco Plaza	33.67	%	4.82	%	4.96	%	250,000		(1,247)		248,753		83,755		(2)(11)	September 1, 2026
500 North Capitol Street, NW	30.00	%	4.15	%	4.20	%	105,000		(25)		104,975		31,493		(2)	June 6, 2023
200 Fifth Avenue	26.69	%	4.34	%	5.60	%	600,000		(9,849)		590,151		148,697		(2)(12)	November 24, 2028
901 New York Avenue	25.00	%	3.61	%	3.69	%	212,200		(357)		211,843		52,961			January 5, 2025
3 Hudson Boulevard	25.00	%	7.29	%	7.37	%	80,000		(32)		79,968		19,992		(2)(13)	July 13, 2023
Metropolitan Square	20.00	%	6.59	%	7.36	%	420,000		(4,158)		415,842		83,168		(2)(14)	April 9, 2024
Reston Next Residential	20.00	%	5.74	%	6.06	%	15,184		(1,507)		13,677		2,735		(2)(15)	May 13, 2026
Total							$	4,048,909	$	(26,163)	$	4,022,746	$	1,600,367

_______________

(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges, which includes mortgage recording fees.

(2)The loan requires interest only payments with a balloon payment due at maturity.

(3)The loan bears interest at a variable rate equal to LIBOR plus 1.28% per annum and matures on July 19, 2025. A subsidiary of the joint venture entered into interest rate swap contracts with notional amounts aggregating $300.0 million through April 1, 2025, resulting in a fixed rate of approximately 4.063% per annum through the expiration of the interest rate swap contracts.

(4)The loan bears interest at a variable rate equal to the greater of (1) the sum of (x) LIBOR and (y) 2.30% or (2) 2.80% per annum and matures on November 10, 2025, with one, one-year extension option, subject to certain conditions.

(5)The construction financing has a borrowing capacity of $198.4 million. The construction financing bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25%, plus (2) 2.50% per annum and matures on December 18, 2025.

(6)The construction financing has a borrowing capacity to $175.8 million. The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2023.

(7)The loan bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. The joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts.

95

(8)The construction financing has a borrowing capacity of $400.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum (LIBOR plus 1.375% per annum upon stabilization, as defined in the loan agreement) and matures on September 5, 2023, with two, one-year extension options, subject to certain conditions.

(9)The construction financing has a borrowing capacity of $255.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.25% per annum and matures on April 26, 2023, with two, one-year extension options, subject to certain conditions.

(10)The loan bears interest at a variable rate equal to Adjusted Term SOFR plus 2.40% per annum and matures on December 14, 2024, with two, one-year extension options, subject to certain conditions. The spread on the variable rate may be reduced, subject to certain conditions.

(11)The loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and matures on September 1, 2026. The joint venture entered into an interest rate cap agreement with a financial institution to limit its exposure to increases in the SOFR rate at a cap of 2.50% per annum on a notional amount of $250.0 million through September 1, 2023.

(12)The loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum and matures on November 24, 2028. The joint venture entered into interest rate swap contracts with notional amounts aggregating $600.0 million through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts. In addition to items noted in footnote one above, the GAAP interest rate includes the adjustment required to reflect the loan at fair value upon acquisition.

(13)We provided $80.0 million of mortgage financing to the joint venture. The loan bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions. The loan has been reflected as Related Party Note Receivable, Net on our Consolidated Balance Sheets. As of December 31, 2022, the loan has approximately $19.1 million of accrued interest due at the maturity date.

(14)The indebtedness consists of (x) a $305.0 million mortgage loan payable which bears interest at a variable rate equal to SOFR plus approximately 1.81% and matures on April 9, 2024 with three, one-year extension options, subject to certain conditions, and (y) a $115.0 million mezzanine note payable which bears interest at a variable rate equal to SOFR plus 5.25% and matures on April 9, 2024 with three, one-year extension options, subject to certain conditions. The joint venture entered into an interest rate cap agreement with a financial institution to limit its exposure to increases in the SOFR rate at a cap of 4.50% per annum on a notional amount of $420.0 million through April 15, 2024.

(15)The construction financing has a borrowing capacity of $140.0 million. The construction financing bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

Market Risk 

Market risk is the risk of loss from adverse changes in market prices and interest rates. Our future earnings, cash flows and fair values relevant to financial instruments are dependent upon prevalent market interest rates. Our primary market risk results from our indebtedness, which bears interest at fixed and variable rates. The fair value of our debt obligations are affected by changes in the market interest rates. We manage our market risk by matching long-term leases with long-term, fixed-rate, non-recourse debt of similar duration. We continue to follow a conservative strategy of generally pre-leasing development projects on a long-term basis to creditworthy clients in order to achieve the most favorable construction and permanent financing terms. Approximately 94.9% of our outstanding debt, excluding our unconsolidated joint ventures, has fixed interest rates, which minimizes the interest rate risk through the maturity of such outstanding debt. We also manage our market risk by entering into hedging arrangements with financial institutions. Our primary objectives when undertaking hedging transactions and derivative positions is to reduce our floating rate exposure and to fix a portion of the interest rate for anticipated financing and refinancing transactions. This in turn, reduces the risks that the variability of cash flows imposes on variable rate debt. Our strategy mitigates against future increases in our interest rates.

At December 31, 2022, our weighted-average coupon/stated rate on our fixed rate outstanding Consolidated Debt was 3.51% per annum. At December 31, 2022, we had $730.0 million of consolidated variable rate debt outstanding. At December 31, 2022, the GAAP interest rate on our variable rate debt was approximately 4.85% per annum. If market interest rates on our variable rate debt had been 100 basis points greater, total interest expense would have increased approximately $7.3 million, on an annualized basis, for the year ended December 31, 2022.

The information above does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, see Note 6 to the Consolidated Financial Statements and “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Investment in Unconsolidated Joint Ventures - Secured Debt.”

96

Funds from Operations

Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of the National Association of Real Estate Investment Trusts (“Nareit”), we calculate Funds from Operations, or “FFO,” for each of BXP and BPLP by adjusting net income (loss) attributable to Boston Properties, Inc. common shareholders and net income (loss) attributable to Boston Properties Limited Partnership common unitholders (computed in accordance with GAAP), respectively, for gains (or losses) from sales of properties, impairment losses on depreciable real estate consolidated on our balance sheet, impairment losses on our investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and our share of real estate-related depreciation and amortization. FFO is a non-GAAP financial measure. We believe the presentation of FFO, combined with the presentation of required GAAP financial measures, improves the understanding of operating results of REITs among the investing public and helps make comparisons of REIT operating results more meaningful. Management generally considers FFO to be useful measures for understanding and comparing our operating results because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses and real estate asset depreciation and amortization (which can differ across owners of similar assets in similar condition based on historical cost accounting and useful life estimates), FFO can help investors compare the operating performance of a company’s real estate across reporting periods and to the operating performance of other companies.

Our computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current Nareit definition or that interpret the current Nareit definition differently. We believe that in order to facilitate a clear understanding of our operating results, FFO should be examined in conjunction with net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders as presented in our Consolidated Financial Statements. FFO should not be considered as a substitute for net income attributable to Boston Properties, Inc. common shareholders or net income attributable to Boston Properties Limited Partnership common unitholders (determined in accordance with GAAP) or any other GAAP financial measures and should only be considered together with and as a supplement to our financial information prepared in accordance with GAAP.  

97

BXP

The following table presents a reconciliation of net income attributable to Boston Properties, Inc. common shareholders to FFO attributable to Boston Properties, Inc. common shareholders for the years ended December 31, 2022, 2021 and 2020:

	Year ended December 31,
	2022			2021			2020
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947		$	496,223		$	862,227
Add:
Preferred stock redemption charge	—			6,412			—
Preferred dividends	—			2,560			10,500
Noncontrolling interest—common units of the Operating Partnership	96,780			55,931			97,704
Noncontrolling interests in property partnerships	74,857			70,806			48,260
Net income	1,020,584			631,932			1,018,691
Add:
Depreciation and amortization	749,775			717,336			683,751
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(70,208)			(67,825)			(71,850)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	89,275			71,966			80,925
Corporate-related depreciation and amortization	(1,679)			(1,753)			(1,840)
Impairment loss on investment in unconsolidated joint venture (1)	50,705			—			60,524
Less:
Gain on sale of real estate included within (loss) income from unconsolidated joint ventures (2)	—			10,257			5,958
Gains on sales of real estate	437,019			123,660			618,982
Gain on sales-type lease	10,058			—			—
Unrealized loss on non-real estate investment	(150)			—			—
Noncontrolling interests in property partnerships	74,857			70,806			48,260
Preferred dividends	—			2,560			10,500
Preferred stock redemption charge	—			6,412			—
Funds from Operations (FFO) attributable to the Operating Partnership common unitholders (including Boston Properties, Inc.)	1,316,668			1,137,961			1,086,501
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations	133,115			111,975			108,310
Funds from Operations attributable to Boston Properties, Inc. common shareholders	$	1,183,553		$	1,025,986		$	978,191
Our percentage share of Funds from Operations—basic	89.89		%	90.16		%	90.03		%
Weighted average shares outstanding—basic	156,726			156,116			155,432

 _______________

(1)The impairment loss on investment in unconsolidated joint venture consists of an other-than-temporary decline in the fair value below the carrying value of our investment in the Dock 72 unconsolidated joint venture for the years ended December 31, 2022 and December 31, 2020.

(2)Consists of the portion of income from unconsolidated joint ventures related to the gain on sale of real estate associated with the sale of our ownership interest in the joint venture that owned Annapolis Junction Buildings Six and Seven for the year ended December 31, 2021 and Annapolis Junction Building Eight and two land parcels for the year ended December 31, 2020.

98

The following tables presents a reconciliation of net income attributable to Boston Properties, Inc. common shareholders to Diluted FFO attributable to Boston Properties, Inc. for income (numerator) and shares/units (denominator) for the years ended December 31, 2022, 2021 and 2020:

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	$	496,223	$	862,227
Add:
Preferred stock redemption charge	—		6,412		—
Preferred dividends	—		2,560		10,500
Noncontrolling interest—common units of the Operating Partnership	96,780		55,931		97,704
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Net income	1,020,584		631,932		1,018,691
Add:
Depreciation and amortization	749,775		717,336		683,751
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(70,208)		(67,825)		(71,850)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	89,275		71,966		80,925
Corporate-related depreciation and amortization	(1,679)		(1,753)		(1,840)
Impairment loss on investment in unconsolidated joint venture (1)	50,705		—		60,524
Less:
Gain on sale of real estate included within (loss) income from unconsolidated joint ventures (2)	—		10,257		5,958
Gains on sales of real estate	437,019		123,660		618,982
Gain on sales-type lease	10,058		—		—
Unrealized loss on non-real estate investment	(150)		—		—
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Preferred dividends	—		2,560		10,500
Preferred stock redemption charge	—		6,412		—
Funds from Operations (FFO) attributable to the Operating Partnership common unitholders (including Boston Properties, Inc.)	1,316,668		1,137,961		1,086,501
Effect of Dilutive Securities:
Stock based compensation	—		—		—
Diluted FFO	1,316,668		1,137,961		1,086,501
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted FFO	132,852		111,748		108,256
Diluted FFO attributable to Boston Properties, Inc. (3)	$	1,183,816	$	1,026,213	$	978,245

___________

(1)The impairment loss on investment in unconsolidated joint venture consists of an other-than-temporary decline in the fair value below the carrying value of our investment in the Dock 72 unconsolidated joint venture for the years ended December 31, 2022 and December 31, 2020.

(2)Consists of the portion of income from unconsolidated joint ventures related to the gain on sale of real estate associated with the sale of our ownership interest in the joint venture that owned Annapolis Junction Buildings Six and Seven for the year ended December 31, 2021 and Annapolis Junction Building Eight and two land parcels for the year ended December 31, 2020.

(3)BXP’s share of diluted Funds from Operations was 89.91%, 90.18% and 90.04% for the years ended December 31, 2022, 2021 and 2020, respectively.

99

	Year ended December 31,
	2022		2021		2020
	shares/units (in thousands)
Basic Funds from Operations		174,360		173,150		172,643
Effect of Dilutive Securities:
Stock based compensation		411		260		85
Diluted Funds from Operations		174,771		173,410		172,728
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted Funds from Operations		17,634		17,034		17,211
Diluted Funds from Operations attributable to Boston Properties, Inc. (1)		157,137		156,376		155,517

 _______________

(1)BXP’s share of diluted Funds from Operations was 89.91%, 90.18% and 90.04% for the years ended December 31, 2022, 2021 and 2020, respectively.

BPLP

The following table presents a reconciliation of net income attributable to Boston Properties Limited Partnership common unitholders to FFO attributable to Boston Properties Limited Partnership common unitholders for the years ended December 31, 2022, 2021 and 2020:

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Add:
Preferred unit redemption charge	—		6,412		—
Preferred distributions	—		2,560		10,500
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Net income	1,032,122		641,771		1,038,739
Add:
Depreciation and amortization	742,293		709,035		676,666
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(70,208)		(67,825)		(71,850)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	89,275		71,966		80,925
Corporate-related depreciation and amortization	(1,679)		(1,753)		(1,840)
Impairment loss on investment in unconsolidated joint venture (1)	50,705		—		60,524
Less:
Gain on sale of investment included within (loss) income from unconsolidated joint ventures (2)	—		10,257		5,958
Gains on sales of real estate	441,075		125,198		631,945
Gain on sales-type lease	10,058		—		—
Unrealized loss on non-real estate investment	(150)		—		—
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Preferred distributions	—		2,560		10,500
Preferred unit redemption charge	—		6,412		—
Funds from Operations attributable to Boston Properties Limited Partnership (3)	$	1,316,668	$	1,137,961	$	1,086,501
Weighted average shares outstanding—basic	174,360		173,150		172,643

100

 _______________

(1)The impairment loss on investment in unconsolidated joint venture consists of an other-than-temporary decline in the fair value below the carrying value of our investment in the Dock 72 unconsolidated joint venture for the years ended December 31, 2022 and December 31, 2020.

(2)Consists of the portion of income from unconsolidated joint ventures related to the gain on sale of real estate associated with the sale of our ownership interest in the joint venture that owned Annapolis Junction Buildings Six and Seven for the year ended December 31, 2021 and Annapolis Junction Building Eight and two land parcels for the year ended December 31, 2020.

(3)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2019 MYLTIP Units).

The following tables presents a reconciliation of net income attributable to Boston Properties Limited Partnership common unitholders to Diluted FFO attributable to Boston Properties Limited Partnership for income (numerator) and shares/units (denominator) for the years ended December 31, 2022, 2021 and 2020:

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Add:
Preferred unit redemption charge	—		6,412		—
Preferred distributions	—		2,560		10,500
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Net income	1,032,122		641,771		1,038,739
Add:
Depreciation and amortization	742,293		709,035		676,666
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(70,208)		(67,825)		(71,850)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	89,275		71,966		80,925
Corporate-related depreciation and amortization	(1,679)		(1,753)		(1,840)
Impairment loss on investment in unconsolidated joint venture (1)	50,705		—		60,524
Less:
Gain on sale of investment included within (loss) income from unconsolidated joint ventures (2)	—		10,257		5,958
Gains on sales of real estate	441,075		125,198		631,945
Gain on sales-type lease	10,058		—		—
Unrealized loss on non-real estate investment	(150)		—		—
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Preferred distributions	—		2,560		10,500
Preferred unit redemption charge	—		6,412		—
Funds from Operations attributable to Boston Properties Limited Partnership (3)	1,316,668		1,137,961		1,086,501
Effect of Dilutive Securities:
Stock based compensation	—		—		—
Diluted Funds from Operations attributed to Boston Properties Limited Partnership	$	1,316,668	$	1,137,961	$	1,086,501

_______________

(1)The impairment loss on investment in unconsolidated joint venture consists of an other-than-temporary decline in the fair value below the carrying value of our investment in the Dock 72 unconsolidated joint venture for the years ended December 31, 2022 and December 31, 2020.

101

(2)Consists of the portion of income from unconsolidated joint ventures related to the gain on sale of real estate associated with the sale of our ownership interest in the joint venture that owned Annapolis Junction Buildings Six and Seven for the year ended December 31, 2021 and Annapolis Junction Building Eight and two land parcels for the year ended December 31, 2020.

(3)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2019 MYLTIP Units).

	Year ended December 31,
	2022	2021		2020
	shares/units (in thousands)
Basic Funds from Operations	174,360		173,150		172,643
Effect of Dilutive Securities:
Stock based compensation	411		260		85
Diluted Funds from Operations	174,771		173,410		172,728

Material Cash Commitments

As of December 31, 2022, we were subject to contractual payment obligations, excluding our unconsolidated joint ventures commitments. For details about our unconsolidated joint venture contractual payment obligations see “Investments in Unconsolidated Joint Ventures - Contractual Obligations” below. Our primary contractual payment obligations, that are not disclosed in other sections of this Annual Report on Form 10-K, are client and development related and described in further detail below. For details about our other contractual payment obligations related to operating and finance leases, mortgage debt, unsecured senior notes, unsecured line of credit and unsecured term loans see Notes 4, 7 and 16 to the Consolidated Financial Statements, respectively.

	Payments Due by Period
	Total		2023		2024		2025		2026		2027		Thereafter
	(in thousands)
Commitments:
Client obligations (1)	$	529,173	$	473,437	$	44,187	$	246	$	10,790	$	513	$	—
Construction contracts on development projects	462,803		394,499		66,844		1,460		—		—		—
Total Commitments	$	991,976	$	867,936	$	111,031	$	1,706	$	10,790	$	513	$	—

 _______________

(1)Committed client-related obligations (tenant improvements and lease commissions) based on executed leases as of December 31, 2022. The timing and amount of these payments is subject to change.

We invest in a non-real estate fund, which is primarily an environmentally focused investment fund, with an aggregate commitment to contribute $10.0 million. As of December 31, 2022, we have contributed $2.4 million, which includes required fees, with $7.8 million remaining to be contributed.

Investment in Unconsolidated Joint Ventures - Contractual Obligations

As of December 31, 2022, the unconsolidated joint ventures that we have an ownership interest in were subject to contractual payment obligations as described in the table below.  The table represents our share of the contractual obligations. For details about our unconsolidated joint ventures secured debt see “Investment In Unconsolidated Joint Ventures - Secured Debt” referred to in “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.”

102

	Payments Due by Period
	Total		2023		2024		2025		2026		2027		Thereafter
	(in thousands)
Contractual Obligations:
Operating leases (1)	$	96,559	$	861	$	873	$	908	$	944	$	957	$	92,016
Finance leases (2)	250,476		10,894		10,980		10,980		10,980		10,980		195,662
Total Contractual Obligations	347,035		11,755		11,853		11,888		11,924		11,937		287,678
Commitments:
Client obligations (3)	41,549		23,717		14,038		91		432		3,271		—
Construction contracts on development projects	329,899		193,069		89,581		36,005		11,244		—		—
Total Commitments	371,448		216,786		103,619		36,096		11,676		3,271		—
	$	718,483	$	228,541	$	115,472	$	47,984	$	23,600	$	15,208	$	287,678

 _______________

(1)Operating leases include approximately $61.6 million related to renewal options that the joint venture is reasonably certain it will exercise.

(2)Finance leases include approximately $194.7 million related to a purchase option that the joint venture is reasonably certain it will exercise in 2028.

(3)Committed client-related obligations (tenant improvements and lease commissions) based on executed leases as of December 31, 2022. The timing and amount of these payments is subject to change.

We have various service contracts with vendors related to our property management. In addition, we have certain other contracts we enter into in the ordinary course of business that may extend beyond one year. These contracts include terms that provide for cancellation with insignificant or no cancellation penalties. Contract terms are generally between three and five years. 

During the year ended December 31, 2022, we paid approximately $302.7 million to fund client-related obligations, including tenant improvements and leasing commissions.

During the year ended December 31, 2022, we and our unconsolidated joint venture partners incurred approximately $415 million of new client-related obligations associated with approximately 4.5 million square feet of second generation leases, or approximately $93 per square foot. In addition, we signed leases for approximately 1.2 million square feet of first generation leases.  The client-related obligations for the development properties are included within the projects’ “Estimated Total Investment” referred to in “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.” In the aggregate, during 2022, we signed leases for approximately 5.7 million square feet of space and incurred aggregate client-related obligations of approximately $732 million, or approximately $129 per square foot.

New Accounting Pronouncements

As of December 31, 2022, there were no new accounting pronouncements.

103

ITEM 7A—Quantitative and Qualitative Disclosures about Market Risk.

The following table presents the aggregate carrying value of our mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit, unsecured term loans, net and our corresponding estimate of fair value as of December 31, 2022. As of December 31, 2022, approximately $13.5 billion of these borrowings bore interest at fixed rates and therefore the fair value of these instruments is affected by changes in the market interest rates. As of December 31, 2022, the weighted-average interest rate on our variable rate debt was 4.85% per annum. The following table presents our aggregate debt obligations with corresponding weighted-average GAAP interest rates sorted by maturity date.

The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, see Note 6 to the Consolidated Financial Statements and “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Investment in Unconsolidated Joint Ventures - Secured Debt.”

	2023			2024			2025			2026			2027			2028+			Total			Estimated Fair Value
	(dollars in thousands) Mortgage debt, net
Fixed Rate	$	(4,840)		$	(4,840)		$	(4,840)		$	(4,840)		$	2,297,141		$	994,587		$	3,272,368		$	2,744,479
GAAP Average Interest Rate	—		%	—		%	—		%	—		%	3.64		%	2.93		%	3.42		%
Variable Rate	—			—			—			—			—			—			—			—
	Unsecured debt, net
Fixed Rate	$	488,105		$	689,277		$	840,541		$	1,991,944		$	743,326		$	5,484,775		$	10,237,968		$	9,135,512
GAAP Average Interest Rate	3.28		%	3.92		%	3.35		%	3.63		%	6.92		%	3.33		%	3.69		%
Variable Rate	730,000			—			—			—			—			—			730,000			730,000
Total Debt	$	1,213,265		$	684,437		$	835,701		$	1,987,104		$	3,040,467		$	6,479,362		$	14,240,336		$	12,609,991

At December 31, 2022, the weighted-average coupon/stated rates on the fixed rate debt stated above was 3.51% per annum. At December 31, 2022, our outstanding variable rate debt totaled $730.0 million. At December 31, 2022, the coupon/stated rate on our variable rate debt was approximately 4.85% per annum. If market interest rates on our variable rate debt had been 100 basis points greater, total interest expense would have increased approximately $7.3 million, on an annualized basis, for the year ended December 31, 2022.

The fair value amounts were determined solely by considering the impact of hypothetical interest rates on our financial instruments. Due to the uncertainty of specific actions, we may undertake to minimize possible effects of market interest rate increases, this analysis assumes no changes in our financial structure.

We expect that all LIBOR settings relevant to us will cease to be published or will no longer be representative after June 30, 2023. The discontinuation of LIBOR will not affect our ability to borrow or maintain already outstanding borrowings or hedging transactions, but if our contracts indexed to LIBOR are converted to SOFR, the differences between LIBOR and SOFR, plus the recommended spread adjustment, could result in interest or hedging costs that are higher than if LIBOR remained available. Additionally, although SOFR is the recommended replacement rate, it is also possible that lenders may instead choose alternative replacements that may differ from LIBOR in ways similar to SOFR or in ways that would result in higher interest or hedging costs for us. It is not yet possible to predict the magnitude of LIBOR’s end on our borrowing costs given the remaining uncertainty about which rates will replace LIBOR. As of December 31, 2022, each of the agreements governing our variable rate debt, for our consolidated debt, either have been transitioned to SOFR or provide for the replacement of LIBOR if it becomes unavailable during the term of such agreement.

Additional disclosure about market risk is incorporated herein by reference from “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Market Risk.”

104

Item 8. Financial Statements and Supplementary Data.

BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

		Page
Boston Properties, Inc.
	Management’s Report on Internal Control over Financial Reporting	106
	Report of Independent Registered Public Accounting Firm (PCAOB ID 238)	107
	Consolidated Balance Sheets as of December 31, 2022 and 2021	110
	Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020	112
	Consolidated Statements of Comprehensive Income for the years ended December 31, 2022, 2021 and 2020	113
	Consolidated Statements of Equity for the years ended December 31, 2022, 2021 and 2020	114
	Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021 and 2020	116
Boston Properties Limited Partnership
	Management’s Report on Internal Control over Financial Reporting	119
	Report of Independent Registered Public Accounting Firm (PCAOB ID 238)	120
	Consolidated Balance Sheets as of December 31, 2022 and 2021	123
	Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020	125
	Consolidated Statements of Comprehensive Income for the years ended December 31, 2022, 2021 and 2020	126
	Consolidated Statements of Capital and Noncontrolling Interests for the years ended December 31, 2022, 2021 and 2020	127
	Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021 and 2020	129
	Notes to Consolidated Financial Statements	132
Boston Properties, Inc.
	Financial Statement Schedule—Schedule 3 - Real Estate Investments and Accumulated Depreciation as of December 31, 2022	182
Boston Properties Limited Partnership
	Financial Statement Schedule—Schedule 3 - Real Estate Investments and Accumulated Depreciation as of December 31, 2022	187

All other schedules for which a provision is made in the applicable accounting regulations of the SEC are not required under the related instructions or are inapplicable, and therefore have been omitted.

105

Management’s Report on Internal Control over

Financial Reporting

Management of Boston Properties, Inc. is responsible for establishing and maintaining adequate internal control over financial reporting for Boston Properties, Inc. Boston Properties, Inc.’s internal control over financial reporting is a process designed under the supervision of its principal executive officer and principal financial officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of Boston Properties, Inc.’s financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles. 

As of the end of Boston Properties, Inc.’s 2022 fiscal year, management conducted assessments of the effectiveness of Boston Properties, Inc.’s internal control over financial reporting based on the framework established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on these assessments, management has determined that Boston Properties, Inc.’s internal control over financial reporting as of December 31, 2022 was effective. 

Our internal control over financial reporting includes policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of management and the directors of Boston Properties, Inc.; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of Boston Properties, Inc.’s assets that could have a material effect on its financial statements. 

The effectiveness of Boston Properties, Inc.’s internal control over financial reporting as of December 31, 2022 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in its report appearing on page 107, which expresses an unqualified opinion on the effectiveness of Boston Properties, Inc.’s internal control over financial reporting as of December 31, 2022.

106

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of Boston Properties, Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Boston Properties, Inc. and its subsidiaries (the “Company”) as of December 31, 2022 and 2021, and the related consolidated statements of operations, of comprehensive income, of equity and of cash flows for each of the three years in the period ended December 31, 2022, including the related notes and financial statement schedule listed in the accompanying index (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2022, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2022 and 2021, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2022 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2022, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company's internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

107

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial statements that were communicated or required to be communicated to the audit committee and that (i) relate to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Assessment of Impairment Indicators of Long-Lived Assets and Investments in Unconsolidated Joint Ventures

As described in Notes 2, 3 and 6 to the consolidated financial statements, the Company’s total real estate balance was $19,496.4 million and its investments in unconsolidated joint ventures was $1,630.5 million as of December 31, 2022. During 2022, the Company recognized a $50.7 million other-than-temporary impairment related to an investment in an unconsolidated joint venture. Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. Management reviews its unconsolidated joint ventures for indicators of impairment on a quarterly basis and records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. Management will record an impairment charge if it determines that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value of unconsolidated joint ventures is calculated using a discounted cash flow model which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, discount rates, and capitalization rates.

The principal considerations for our determination that performing procedures relating to the assessment of impairment indicators for long-lived assets and investments in unconsolidated joint ventures is a critical audit matter are (i) the significant judgment by management (a) in identifying the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures and (b) when developing the fair value estimate of the investment in unconsolidated joint venture with an other- than- temporary impairment, (ii) a high degree of auditor judgment, subjectivity and effort in performing procedures and evaluating audit evidence related to (a) management's identification of the indicators of impairment related to the operating performance and anticipated hold periods for long-lived assets and the performance of each investment and market conditions for investments in unconsolidated joint ventures and (b) management’s assumptions related to future occupancy, future rental rates, future capital requirements, discount rate and capitalization rate (collectively referred to as “the significant fair value assumptions”), and (iii) the audit effort related to management’s development of the fair value estimate of the investment in unconsolidated joint venture with an other-than-temporary impairment involved the use of professionals with specialized skill and knowledge.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to (i) the identification of the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures and (ii) developing the fair value estimate of the unconsolidated investment in joint venture with an other- than- temporary impairment. For the identification of the indicators of impairment, these procedures also included, among others, (i) testing management's process for identifying the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures, (ii) evaluating the reasonableness of the models, (iii) testing the completeness and accuracy of the underlying data used in the models, and (iv) evaluating the reasonableness of management’s indicators of impairment related to the operating performance and anticipated hold periods for long-lived assets and the performance of each investment and market

108

conditions for investments in unconsolidated joint ventures. Evaluating the operating performance and anticipated hold periods involved considering the current and past performance of the long-lived assets, the consistency with external market and industry data, and whether the indicators were consistent with evidence obtained in other areas of the audit. Evaluating performance of each investment and market conditions involved considering changes in the performance of the investments and market conditions and evidence obtained in other areas of the audit. For the fair value estimate of the unconsolidated investment in joint venture with an other- than- temporary decline, these procedures also included, among others, (i) testing management’s process for developing the fair value estimate of the investment in unconsolidated joint venture relating to the other-than-temporary impairment, (ii) evaluating the appropriateness of management’s discounted cash flow model, (iii) testing the completeness and accuracy of the underlying data used in the model, and (iv) evaluating the reasonableness of the significant fair value assumptions used by management by considering industry knowledge and data, historical company data, and evidence obtained in other areas of the audit. Professionals with specialized skill and knowledge were used to assist in the evaluation of the appropriateness of the discounted cash flow model and reasonableness of the significant fair value assumptions.

Purchase Price Allocation for Long-Lived Asset Property Acquisitions

As described in Notes 2 and 3 to the consolidated financial statements, during the year ended December 31, 2022, the Company acquired two properties for an aggregate purchase price of $1,316.7 million. Management assesses the fair value of acquired tangible and intangible assets (including land, buildings and improvements, tenant improvements, “above-” and “below-market” leases, leasing costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. Management assesses fair value based on estimated cash flow projections that utilize discount, and/or capitalization rates, and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The principal considerations for our determination that performing procedures relating to the purchase price allocation for long-lived asset property acquisitions is a critical audit matter are (i) the significant judgment by management in developing the fair value estimates of assets acquired and the corresponding purchase price allocation, (ii) a high degree of auditor judgment, subjectivity, and effort in performing procedures and evaluating audit evidence related to management’s significant assumptions related to discount rates and capitalization rates, and (iii) the audit effort involved the use of professionals with specialized skill and knowledge.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to the purchase price allocation for long-lived asset property acquisitions, including controls over the assumptions related to discount rates and capitalization rates used to determine the fair value of the assets acquired and the corresponding purchase price allocation. These procedures also included, among others, (i) reading the purchase agreements for all acquisitions, (ii) testing management’s process for developing the fair value estimates of the assets acquired and the corresponding purchase price allocation, (iii) evaluating the appropriateness of management’s discounted cash flow methods, (iv) testing the completeness and accuracy of the underlying data used in the methods, and, (v) evaluating the reasonableness of the significant assumptions used by management, related to the discount rates and capitalization rates by considering industry knowledge and data as well as historical company data and experience. Professionals with specialized skill and knowledge were used to assist in the evaluation of the appropriateness of the discounted cash flow model and reasonableness of the discount rates and capitalization rates assumptions.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts

February 27, 2023

We have served as the Company’s auditor since 1997.

109

BOSTON PROPERTIES, INC. CONSOLIDATED BALANCE SHEETS (in thousands, except for share and par value amounts)
	December 31, 2022		December 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$	25,389,663	$	23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,298,082)		(5,883,961)
Total real estate	19,496,442		18,275,954
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333		452,692
Cash held in escrows	46,479		48,466
Investments in securities	32,277		43,632
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389		70,186
Related party note receivable, net	78,576		78,336
Notes receivable, net	—		9,641
Sales-type lease receivable, net	12,811		—
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580		1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282		618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589		57,811
Investments in unconsolidated joint ventures	1,715,911		1,482,997
Total assets	$	24,207,669	$	22,365,258
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	$	3,272,368	$	3,267,914
Unsecured senior notes, net	10,237,968		9,483,695
Unsecured line of credit	—		145,000
Unsecured term loan, net	730,000		—
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335		244,421
Lease liabilities - operating leases	204,686		204,561
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545		320,775
Dividends and distributions payable	170,643		169,859
Accrued interest payable	103,774		94,796
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	450,918		391,441
Total liabilities	15,837,237		14,322,462
Commitments and contingencies (See Note 8)
Redeemable deferred stock units— 97,853 and 83,073 units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	6,613		9,568

110

BOSTON PROPERTIES, INC. CONSOLIDATED BALANCE SHEETS (in thousands, except for share and par value amounts)
	December 31, 2022		December 31, 2021
Equity:
Stockholders’ equity attributable to Boston Properties, Inc.:
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding	—		—
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued or outstanding	—		—
Common stock, $0.01 par value, 250,000,000 shares authorized, 156,836,767 and 156,623,749 issued and 156,757,867 and 156,544,849 outstanding at December 31, 2022 and December 31, 2021, respectively	1,568		1,565
Additional paid-in capital	6,539,147		6,497,730
Dividends in excess of earnings	(391,356)		(625,891)
Treasury common stock at cost, 78,900 shares at December 31, 2022 and December 31, 2021	(2,722)		(2,722)
Accumulated other comprehensive loss	(13,718)		(36,662)
Total stockholders’ equity attributable to Boston Properties, Inc.	6,132,919		5,834,020
Noncontrolling interests:
Common units of Boston Properties Limited Partnership	683,583		642,655
Property partnerships	1,547,317		1,556,553
Total equity	8,363,819		8,033,228
Total liabilities and equity	$	24,207,669	$	22,365,258

The accompanying notes are an integral part of these consolidated financial statements.

111

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except for per share amounts)

	Year ended December 31,
	2022		2021		2020
Revenue
Lease	$	2,918,368	$	2,753,014	$	2,646,261
Parking and other	107,225		81,814		70,680
Hotel	39,482		13,609		7,478
Development and management services	28,056		27,697		29,641
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Total revenue	3,108,581		2,888,621		2,765,686
Expenses
Operating
Rental	1,108,070		1,021,151		1,017,208
Hotel	27,478		12,998		13,136
General and administrative	146,378		151,573		133,112
Payroll and related costs from management services contracts	15,450		12,487		11,626
Transaction costs	2,905		5,036		1,531
Depreciation and amortization	749,775		717,336		683,751
Total expenses	2,050,056		1,920,581		1,860,364
Other income (expense)
Loss from unconsolidated joint ventures	(59,840)		(2,570)		(85,110)
Gains on sales of real estate	437,019		123,660		618,982
Gain on sales-type lease	10,058		—		—
Interest and other income (loss)	11,940		5,704		5,953
Other income - assignment fee	6,624		—		—
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Unrealized loss on non-real estate investment	(150)		—		—
Losses from early extinguishment of debt	—		(45,182)		—
Interest expense	(437,139)		(423,346)		(431,717)
Net income	1,020,584		631,932		1,018,691
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(74,857)		(70,806)		(48,260)
Noncontrolling interest—common units of the Operating Partnership	(96,780)		(55,931)		(97,704)
Net income attributable to Boston Properties, Inc.	848,947		505,195		872,727
Preferred dividends	—		(2,560)		(10,500)
Preferred stock redemption charge	—		(6,412)		—
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	$	496,223	$	862,227
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income	$	5.41	$	3.18	$	5.54
Weighted average number of common shares outstanding	156,726		156,116		155,432
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income	$	5.40	$	3.17	$	5.54
Weighted average number of common and common equivalent shares outstanding	157,137		156,376		155,517

The accompanying notes are an integral part of these consolidated financial statements.

112

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Year ended December 31,
	2022		2021		2020
Net income	$	1,020,584	$	631,932	$	1,018,691
Other comprehensive income:
Effective portion of interest rate contracts	19,396		8,544		(7,848)
Amortization of interest rate contracts (1)	6,707		6,704		6,697
Other comprehensive income (loss)	26,103		15,248		(1,151)
Comprehensive income	1,046,687		647,180		1,017,540
Net income attributable to noncontrolling interests	(171,637)		(126,737)		(145,964)
Other comprehensive income attributable to noncontrolling interests	(3,156)		(2,020)		(404)
Comprehensive income attributable to Boston Properties, Inc.	$	871,894	$	518,423	$	871,172

_______________

(1)Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties, Inc.’s Consolidated Statements of Operations.

The accompanying notes are an integral part of these consolidated financial statements.

113

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF EQUITY  (in thousands)
	Common Stock			Preferred Stock		Additional Paid-in Capital		Dividends in Excess of Earnings		Treasury Stock, at cost		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Common Units		Noncontrolling Interests - Property Partnerships		Total
	Shares	Amount
Equity, December 31, 2019	154,790	$	1,548	$	200,000	$	6,294,719	$	(760,523)	$	(2,722)	$	(48,335)	$	600,860	$	1,728,689	$	8,014,236
Cumulative effect of a change in accounting principle	—	—		—		—		(1,505)		—		—		(174)		—		(1,679)
Redemption of operating partnership units to common stock	857	9		—		29,689		—		—		—		(29,698)		—		—
Allocated net income for the period	—	—		—		—		872,727		—		—		97,704		48,260		1,018,691
Dividends/distributions declared	—	—		—		—		(620,352)		—		—		(68,921)		—		(689,273)
Shares issued pursuant to stock purchase plan	7	—		—		759		—		—		—		—		—		759
Net activity from stock option and incentive plan	65	—		—		9,303		—		—		—		39,318		—		48,621
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		8,219		8,219
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		(58,811)		(58,811)
Effective portion of interest rate contracts	—	—		—		—		—		—		(7,066)		(782)		—		(7,848)
Amortization of interest rate contracts	—	—		—		—		—		—		5,511		610		576		6,697
Reallocation of noncontrolling interest	—	—		—		22,321		—		—		—		(22,321)		—		—
Equity, December 31, 2020	155,719	1,557		200,000		6,356,791		(509,653)		(2,722)		(49,890)		616,596		1,726,933		8,339,612
Redemption of operating partnership units to common stock	524	5		—		18,381		—		—		—		(18,386)		—		—
Allocated net income for the period	—	—		—		—		505,195		—		—		55,931		70,806		631,932
Dividends/distributions declared	—	—		—		—		(615,021)		—		—		(68,822)		—		(683,843)
Shares issued pursuant to stock purchase plan	9	—		—		1,004		—		—		—		—		—		1,004
Net activity from stock option and incentive plan	293	3		—		25,607		—		—		—		45,773		—		71,383
Issuance of operating partnership units for 360 Park Avenue South	—	—		—		—		—		—		—		99,689		—		99,689
Preferred stock redemption	—	—		(200,000)		6,377		—		—		—		—		—		(193,623)
Preferred stock redemption charge	—	—		—		—		(6,412)		—		—		—		—		(6,412)
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		18,002		18,002
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		(259,764)		(259,764)
Effective portion of interest rate contracts	—	—		—		—		—		—		7,703		841		—		8,544
Amortization of interest rate contracts	—	—		—		—		—		—		5,525		603		576		6,704
Reallocation of noncontrolling interest	—	—		—		89,570		—		—		—		(89,570)		—		—
Equity, December 31, 2021	156,545	1,565		—		6,497,730		(625,891)		(2,722)		(36,662)		642,655		1,556,553		8,033,228

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BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF EQUITY  (in thousands)
	Common Stock			Preferred Stock		Additional Paid-in Capital		Dividends in Excess of Earnings		Treasury Stock, at cost		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Common Units		Noncontrolling Interests - Property Partnerships		Total
	Shares	Amount
Redemption of operating partnership units to common stock	182	3		—		6,536		—		—		—		(6,539)		—		—
Allocated net income for the period	—	—		—		—		848,947		—		—		96,780		74,857		1,020,584
Dividends/distributions declared	—	—		—		—		(614,412)		—		—		(71,714)		—		(686,126)
Shares issued pursuant to stock purchase plan	10	—		—		1,036		—		—		—		—		—		1,036
Net activity from stock option and incentive plan	21	—		—		7,261		—		—		—		46,402		—		53,663
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		849		849
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		(85,518)		(85,518)
Effective portion of interest rate contracts	—	—		—		—		—		—		17,435		1,961		—		19,396
Amortization of interest rate contracts	—	—		—		—		—		—		5,509		622		576		6,707
Reallocation of noncontrolling interest	—	—		—		26,584		—		—		—		(26,584)		—		—
Equity, December 31, 2022	156,758	$	1,568	$	—	$	6,539,147	$	(391,356)	$	(2,722)	$	(13,718)	$	683,583	$	1,547,317	$	8,363,819

The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Cash flows from operating activities:
Net income	$	1,020,584	$	631,932	$	1,018,691
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	749,775		717,336		683,751
Amortization of right of use assets - operating leases	2,427		3,516		2,234
Non-cash compensation expense	52,026		50,860		44,142
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Distributions of net cash flow from operations of unconsolidated joint ventures	26,827		21,542		31,892
Losses (gains) from investments in securities	6,453		(5,626)		(5,261)
Allowance for current expected credit losses	(224)		(1,207)		1,849
Non-cash portion of interest expense	25,831		23,368		23,384
Settlement of accreted debt discount on redemption of unsecured senior notes	—		(8,500)		—
Losses from early extinguishments of debt	—		45,182		—
Other income - assignment fee	(6,624)		—		—
Gains on sales of real estate	(437,019)		(123,660)		(618,982)
Gain on sales-type lease	(10,058)		—		—
Unrealized loss on non-real estate investment	150		—		—
Change in assets and liabilities:
Tenant and other receivables, net	(7,621)		4,820		22,550
Notes receivable, net	(152)		(545)		(19)
Accrued rental income, net	(98,075)		(101,548)		(97,099)
Prepaid expenses and other assets	20,099		(20,811)		12,488
Lease liabilities - finance leases	—		—		568
Lease liabilities - operating leases	125		(23,599)		1,533
Accounts payable and accrued expenses	(22,777)		20,025		(4,059)
Accrued interest payable	8,989		(10,839)		16,211
Other liabilities	(24,120)		(28,739)		17,629
Tenant leasing costs	(84,057)		(62,850)		(79,772)
Total adjustments	261,815		501,295		138,149
Net cash provided by operating activities	1,282,399		1,133,227		1,156,840
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)		(222,260)		(137,976)
Construction in progress	(500,273)		(513,878)		(482,507)
Building and other capital improvements	(177,004)		(150,998)		(160,126)
Tenant improvements	(218,685)		(263,952)		(234,423)
Proceeds from sales of real estate	834,770		179,887		519,303
Proceeds from assignment fee	6,624		—		—
Capital contributions to unconsolidated joint ventures	(277,581)		(98,152)		(172,436)
Capital distributions from unconsolidated joint ventures	37,122		122		55,298
Proceeds from sale of investment in unconsolidated joint venture	—		17,789		—
Investments in non-real estate investments	(2,404)		—		—
Issuance of notes receivable, net	—		—		(9,800)

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BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Proceeds from notes receivable	10,000		10,035		6,397
Investments in securities, net	4,902		1,451		2,551
Net cash used in investing activities	(1,602,802)		(1,039,956)		(613,719)
Cash flows from financing activities:
Proceeds from mortgage notes payable	—		1,201,388		—
Repayments of mortgage notes payable	—		(832,296)		(17,168)
Proceeds from unsecured senior notes	749,557		1,695,996		1,248,125
Redemption of unsecured senior notes	—		(1,841,500)		—
Borrowings on unsecured line of credit	985,000		770,000		265,000
Repayments of unsecured line of credit	(1,130,000)		(625,000)		(265,000)
Borrowings on unsecured term loan	730,000		—		—
Redemption of preferred stock	—		(200,000)		—
Payments on finance lease obligations	—		1,250		—
Repayment of unsecured term loan	—		(500,000)		—
Deferred financing costs	(8,460)		(20,757)		(10,416)
Debt issuance costs	—		(16,186)		—
Debt prepayment and extinguishment costs	—		(43,036)		—
Net activity from equity transactions	(352)		24,214		3,277
Dividends and distributions	(685,019)		(683,753)		(688,904)
Contributions from noncontrolling interests in property partnerships	849		18,002		8,219
Distributions to noncontrolling interests in property partnerships	(85,518)		(259,764)		(58,811)
Net cash provided by (used in) financing activities	556,057		(1,311,442)		484,322
Net increase (decrease) in cash and cash equivalents and cash held in escrows	235,654		(1,218,171)		1,027,443
Cash and cash equivalents and cash held in escrows, beginning of period	501,158		1,719,329		691,886
Cash and cash equivalents and cash held in escrows, end of period	$	736,812	$	501,158	$	1,719,329
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	452,692	$	1,668,742	$	644,950
Cash held in escrows, beginning of period	48,466		50,587		46,936
Cash and cash equivalents and cash held in escrows, beginning of period	$	501,158	$	1,719,329	$	691,886
Cash and cash equivalents, end of period	$	690,333	$	452,692	$	1,668,742
Cash held in escrows, end of period	46,479		48,466		50,587
Cash and cash equivalents and cash held in escrows, end of period	$	736,812	$	501,158	$	1,719,329
Supplemental disclosures:
Cash paid for interest	$	449,903	$	465,442	$	433,492
Interest capitalized	$	52,130	$	53,097	$	53,881
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(119,534)	$	(239,317)	$	(99,494)
Change in real estate included in accounts payable and accrued expenses	$	97,586	$	(25,183)	$	(19,848)
Construction in progress, net deconsolidated	$	(11,316)	$	(299,947)	$	—

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BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	11,316	$	107,132	$	347,898
Sales-type lease origination	$	13,045	$	—	$	—
Derecognition of assets in exchange for sales-type lease obligation	$	(2,987)	$	—	$	—
Accrued rental income, net deconsolidated	$	—	$	—	$	(4,558)
Tenant leasing costs, net deconsolidated	$	—	$	—	$	(3,462)
Building and other capital improvements, net deconsolidated	$	—	$	—	$	(111,889)
Tenant improvements, net deconsolidated	$	—	$	—	$	(12,331)
Prepaid expenses and other assets, net deconsolidated	$	—	$	(5,011)	$	—
Assumption of mortgage notes payable	$	—	$	200,311	$	—
Mortgage notes payable, net deconsolidation	$	—	$	(198,381)	$	—
Issuance of operating partnership units	$	—	$	99,689	$	—
Right-of-use assets obtained in exchange for lease liabilities	$	—	$	26,887	$	—
Dividends and distributions declared but not paid	$	170,643	$	169,859	$	171,082
Conversions of noncontrolling interests to stockholders’ equity	$	6,539	$	18,386	$	29,698
Issuance of restricted securities to employees and non-employee directors	$	48,417	$	44,405	$	42,607

The accompanying notes are an integral part of these consolidated financial statements.

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Management’s Report on Internal Control over

Financial Reporting

Management of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership, is responsible for establishing and maintaining adequate internal control over financial reporting for Boston Properties Limited Partnership. Boston Properties Limited Partnership’s internal control over financial reporting is a process designed under the supervision of the principal executive officer and principal financial officer of Boston Properties, Inc. to provide reasonable assurance regarding the reliability of financial reporting and the preparation of Boston Properties Limited Partnership’s financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles.

As of the end of Boston Properties Limited Partnership’s 2022 fiscal year, management conducted assessments of the effectiveness of Boston Properties Limited Partnership’s internal control over financial reporting based on the framework established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on these assessments, management has determined that Boston Properties Limited Partnership’s internal control over financial reporting as of December 31, 2022 was effective.

Boston Properties Limited Partnership’s internal control over financial reporting includes policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of management and the directors of Boston Properties, Inc.; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of Boston Properties Limited Partnership’s assets that could have a material effect on our financial statements.

The effectiveness of Boston Properties Limited Partnership’s internal control over financial reporting as of December 31, 2022 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in its report appearing on page 120, which expresses an unqualified opinion on the effectiveness of Boston Properties Limited Partnership’s internal control over financial reporting as of December 31, 2022.

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Report of Independent Registered Public Accounting Firm

To the Partners of Boston Properties Limited Partnership

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Boston Properties Limited Partnership and its subsidiaries (the “Partnership”) as of December 31, 2022 and 2021, and the related consolidated statements of operations, of comprehensive income, of capital and noncontrolling interests and of cash flows for each of the three years in the period ended December 31, 2022, including the related notes and financial statement schedule listed in the accompanying index (collectively referred to as the “consolidated financial statements”). We also have audited the Partnership’s internal control over financial reporting as of December 31, 2022, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Partnership as of December 31, 2022 and 2021, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2022 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2022, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Partnership’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express opinions on the Partnership’s consolidated financial statements and on the Partnership’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable

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assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial statements that were communicated or required to be communicated to the audit committee and that (i) relate to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Assessment of Impairment Indicators of Long-Lived Assets and Investments in Unconsolidated Joint Ventures

As described in Notes 2, 3 and 6 to the consolidated financial statements, the Partnership’s total real estate balance was $19,246.5 million and its investments in unconsolidated joint ventures was $1,630.5 million as of December 31, 2022. During 2022, the Partnership recognized a $50.7 million other than temporary impairment related to an investment in an unconsolidated joint venture. Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. Management reviews its unconsolidated joint ventures for indicators of impairment on a quarterly basis and records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. Management will record an impairment charge if it determines that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value of unconsolidated joint ventures is calculated using a discounted cash flow model which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, discount rates, and capitalization rates.

The principal considerations for our determination that performing procedures relating to the assessment of impairment indicators for long-lived assets and investments in unconsolidated joint ventures is a critical audit matter are (i) the significant judgment by management (a) in identifying the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures and (b) when developing the fair value estimate of the investment in unconsolidated joint venture with an other- than- temporary impairment, (ii) a high degree of auditor judgment, subjectivity and effort in performing procedures and evaluating audit evidence related to (a) management's identification of the indicators of impairment related to the operating performance and anticipated hold periods for long-lived assets and the performance of each investment and market conditions for investments in unconsolidated joint ventures and (b) management’s assumptions related to future occupancy, future rental rates, future capital requirements, discount rate and capitalization rate (collectively referred to as “the significant fair value assumptions”), and (iii) the audit effort related to management’s development of the fair value estimate of the investment in unconsolidated joint venture with an other-than-temporary impairment involved the use of professionals with specialized skill and knowledge.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to (i) the identification of the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures and (ii) developing the fair value estimate of the unconsolidated investment in joint venture with an other- than- temporary impairment. For the identification of the indicators of impairment, these procedures also included, among others, (i) testing management's process for identifying the indicators of impairment for long-lived assets and investments in unconsolidated joint ventures, (ii) evaluating the

121

reasonableness of the models, (iii) testing the completeness and accuracy of the underlying data used in the models, and (iv) evaluating the reasonableness of management’s indicators of impairment related to the operating performance and anticipated hold periods for long-lived assets and the performance of each investment and market conditions for investments in unconsolidated joint ventures. Evaluating the operating performance and anticipated hold periods involved considering the current and past performance of the long-lived assets, the consistency with external market and industry data, and whether the indicators were consistent with evidence obtained in other areas of the audit. Evaluating performance of each investment and market conditions involved considering changes in the performance of the investments and market conditions and evidence obtained in other areas of the audit. For the fair value estimate of the unconsolidated investment in joint venture with an other- than- temporary decline, these procedures also included, among others, (i) testing management’s process for developing the fair value estimate of the investment in unconsolidated joint venture relating to the other-than-temporary impairment, (ii) evaluating the appropriateness of management’s discounted cash flow model, (iii) testing the completeness and accuracy of the underlying data used in the model, and (iv) evaluating the reasonableness of the significant fair value assumptions used by management by considering industry knowledge and data, historical Partnership data, and evidence obtained in other areas of the audit. Professionals with specialized skill and knowledge were used to assist in the evaluation of the appropriateness of the discounted cash flow model and reasonableness of the significant fair value assumptions.

Purchase Price Allocation for Long-Lived Asset Property Acquisitions

As described in Notes 2 and 3 to the consolidated financial statements, during the year ended December 31, 2022, the Partnership acquired two properties for an aggregate purchase price of $1,316.7 million. Management assesses the fair value of acquired tangible and intangible assets (including land, buildings and improvements, tenant improvements, “above-” and “below-market” leases, leasing costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. Management assesses fair value based on estimated cash flow projections that utilize discount, and/or capitalization rates, and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The principal considerations for our determination that performing procedures relating to the purchase price allocation for long-lived asset property acquisitions is a critical audit matter are (i) the significant judgment by management in developing the fair value estimates of assets acquired and the corresponding purchase price allocation, (ii) a high degree of auditor judgment, subjectivity, and effort in performing procedures and evaluating audit evidence related to management’s significant assumptions related to discount rates and capitalization rates, and (iii) the audit effort involved the use of professionals with specialized skill and knowledge.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to the purchase price allocation for long-lived asset property acquisitions, including controls over the assumptions related to discount rates and capitalization rates used to determine the fair value of the assets acquired and the corresponding purchase price allocation. These procedures also included, among others, (i) reading the purchase agreements for all acquisitions, (ii) testing management’s process for developing the fair value estimates of the assets acquired and the corresponding purchase price allocation, (iii) evaluating the appropriateness of management’s discounted cash flow methods, (iv) testing the completeness and accuracy of the underlying data used in the methods, and, (v) evaluating the reasonableness of the significant assumptions used by management, related to the discount rates and capitalization rates by considering industry knowledge and data as well as historical Partnership data and experience. Professionals with specialized skill and knowledge were used to assist in the evaluation of the appropriateness of the discounted cash flow model and reasonableness of the discount rates and capitalization rates assumptions.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts

February 27, 2023

We have served as the Partnership’s auditor since 1997.

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BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEETS (in thousands, except for unit amounts)
	December 31, 2022		December 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$	25,022,149	$	23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,180,474)		(5,772,018)
Total real estate	19,246,536		18,014,510
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333		452,692
Cash held in escrows	46,479		48,466
Investments in securities	32,277		43,632
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389		70,186
Related party note receivable, net	78,576		78,336
Notes receivable, net	—		9,641
Sales-type lease receivable, net	12,811		—
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580		1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282		618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589		57,811
Investments in unconsolidated joint ventures	1,715,911		1,482,997
Total assets	$	23,957,763	$	22,103,814
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	$	3,272,368	$	3,267,914
Unsecured senior notes, net	10,237,968		9,483,695
Unsecured line of credit	—		145,000
Unsecured term loan, net	730,000		—
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335		244,421
Lease liabilities - operating leases	204,686		204,561
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545		320,775
Dividends and distributions payable	170,643		169,859
Accrued interest payable	103,774		94,796
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	450,918		391,441
Total liabilities	15,837,237		14,322,462
Commitments and contingencies (See Note 8)
Redeemable deferred stock units— 97,853 and 83,073 units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	6,613		9,568

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BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEETS (in thousands, except for unit amounts)
	December 31, 2022		December 31, 2021
Noncontrolling interests:
Redeemable partnership units— 16,531,172 and 16,561,186 common units and 1,679,175 and 1,485,376 long term incentive units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	1,280,886		2,078,603
Capital:
Boston Properties Limited Partnership partners’ capital— 1,749,682 and 1,745,914 general partner units and 155,008,185 and 154,798,935 limited partner units outstanding at December 31, 2022 and December 31, 2021, respectively	5,299,428		4,173,290
Accumulated other comprehensive loss	(13,718)		(36,662)
Total partners’ capital	5,285,710		4,136,628
Noncontrolling interests in property partnerships	1,547,317		1,556,553
Total capital	6,833,027		5,693,181
Total liabilities and capital	$	23,957,763	$	22,103,814

The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except for per unit amounts)

	Year ended December 31,
	2022		2021		2020
Revenue
Lease	$	2,918,368	$	2,753,014	$	2,646,261
Parking and other	107,225		81,814		70,680
Hotel	39,482		13,609		7,478
Development and management services	28,056		27,697		29,641
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Total revenue	3,108,581		2,888,621		2,765,686
Expenses
Operating
Rental	1,108,070		1,021,151		1,017,208
Hotel	27,478		12,998		13,136
General and administrative	146,378		151,573		133,112
Payroll and related costs from management services contracts	15,450		12,487		11,626
Transaction costs	2,905		5,036		1,531
Depreciation and amortization	742,293		709,035		676,666
Total expenses	2,042,574		1,912,280		1,853,279
Other income (expense)
Loss from unconsolidated joint ventures	(59,840)		(2,570)		(85,110)
Gains on sales of real estate	441,075		125,198		631,945
Gain on sales-type lease	10,058		—		—
Interest and other income (loss)	11,940		5,704		5,953
Other income - assignment fee	6,624		—		—
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Unrealized loss on non-real estate investment	(150)		—		—
Losses from early extinguishment of debt	—		(45,182)		—
Interest expense	(437,139)		(423,346)		(431,717)
Net income	1,032,122		641,771		1,038,739
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(74,857)		(70,806)		(48,260)
Net income attributable to Boston Properties Limited Partnership	957,265		570,965		990,479
Preferred distributions	—		(2,560)		(10,500)
Preferred unit redemption charge	—		(6,412)		—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Basic earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	5.48	$	3.25	$	5.67
Weighted average number of common units outstanding	174,360		173,150		172,643
Diluted earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	5.47	$	3.24	$	5.67
Weighted average number of common and common equivalent units outstanding	174,771		173,410		172,728

The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Year ended December 31,
	2022		2021		2020
Net income	$	1,032,122	$	641,771	$	1,038,739
Other comprehensive income:
Effective portion of interest rate contracts	19,396		8,544		(7,848)
Amortization of interest rate contracts (1)	6,707		6,704		6,697
Other comprehensive income (loss)	26,103		15,248		(1,151)
Comprehensive income	1,058,225		657,019		1,037,588
Comprehensive income attributable to noncontrolling interests	(75,433)		(71,382)		(48,836)
Comprehensive income attributable to Boston Properties Limited Partnership	$	982,792	$	585,637	$	988,752

_______________

(1)Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties Limited Partnership’s Consolidated Statements of Operations.

The accompanying notes are an integral part of these consolidated financial statements.

126

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS (in thousands)
	Units		Capital
	General Partner	Limited Partner	Partners’ Capital (General and Limited Partners)		Preferred Units		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Property Partnerships		Total Capital		Noncontrolling Interests - Redeemable Partnership Units
Equity, December 31, 2019	1,727	153,063	$	3,380,175	$	193,623	$	(48,335)	$	1,728,689	$	5,254,152	$	2,468,753
Cumulative effect of a change in accounting principal	—	—	(1,505)		—		—		—		(1,505)		(174)
Net activity from contributions and unearned compensation	1	72	10,062		—		—		—		10,062		39,318
Allocated net income for the period	—	—	882,275		10,500		—		48,260		941,035		97,704
Distributions	—	—	(609,852)		(10,500)		—		—		(620,352)		(68,921)
Conversion of redeemable partnership units	3	853	29,689		—		—		—		29,689		(29,689)
Adjustment to reflect redeemable partnership units at redemption value	—	—	863,795		—		—		—		863,795		(863,795)
Effective portion of interest rate contracts	—	—	—		—		(7,066)		—		(7,066)		(782)
Amortization of interest rate contracts	—	—	—		—		5,511		576		6,087		610
Contributions from noncontrolling interests in property partnerships	—	—	—		—		—		8,219		8,219		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		—		(58,811)		(58,811)		—
Equity, December 31, 2020	1,731	153,988	4,554,639		193,623		(49,890)		1,726,933		6,425,305		1,643,024
Net activity from contributions and unearned compensation	5	295	26,614		—		—		—		26,614		45,773
Allocated net income for the period	—	—	512,474		2,560		—		70,806		585,840		55,931
Distributions	—	—	(612,461)		(2,560)		—		—		(615,021)		(68,822)
Issuance of operating partnership units for 360 Park Avenue South	—	—	—		—		—		—		—		99,689
Preferred unit redemption	—	—	—		(193,623)		—		—		(193,623)		—
Preferred unit redemption charge	—	—	(6,412)		—		—		—		(6,412)		—
Conversion of redeemable partnership units	10	516	18,386		—		—		—		18,386		(18,386)
Adjustment to reflect redeemable partnership units at redemption value	—	—	(319,950)		—		—		—		(319,950)		319,950
Effective portion of interest rate contracts	—	—	—		—		7,703		—		7,703		841
Amortization of interest rate contracts	—	—	—		—		5,525		576		6,101		603
Contributions from noncontrolling interests in property partnerships	—	—	—		—		—		18,002		18,002		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		—		(259,764)		(259,764)		—
Equity, December 31, 2021	1,746	154,799	4,173,290		—		(36,662)		1,556,553		5,693,181		2,078,603

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BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS (in thousands)
	Units		Capital
	General Partner	Limited Partner	Partners’ Capital (General and Limited Partners)		Preferred Units		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Property Partnerships		Total Capital		Noncontrolling Interests - Redeemable Partnership Units
Net activity from contributions and unearned compensation	1	30	8,291		—		—		—		8,291		46,408
Allocated net income for the period	—	—	860,485		—		—		74,857		935,342		96,780
Distributions	—	—	(614,412)		—		—		—		(614,412)		(71,714)
Conversion of redeemable partnership units	3	179	6,539		—		—		—		6,539		(6,539)
Adjustment to reflect redeemable partnership units at redemption value	—	—	865,235		—		—		—		865,235		(865,235)
Effective portion of interest rate contracts	—	—	—		—		17,435		—		17,435		1,961
Amortization of interest rate contracts	—	—	—		—		5,509		576		6,085		622
Contributions from noncontrolling interests in property partnerships	—	—	—		—		—		849		849		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		—		(85,518)		(85,518)		—
Equity, December 31, 2022	1,750	155,008	$	5,299,428	$	—	$	(13,718)	$	1,547,317	$	6,833,027	$	1,280,886

The accompanying notes are an integral part of these consolidated financial statements.

128

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Cash flows from operating activities:
Net income	$	1,032,122	$	641,771	$	1,038,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	742,293		709,035		676,666
Amortization of right of use assets - operating leases	2,427		3,516		2,234
Non-cash compensation expense	52,026		50,860		44,142
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Distributions of net cash flow from operations of unconsolidated joint ventures	26,827		21,542		31,892
Losses (gains) from investments in securities	6,453		(5,626)		(5,261)
Allowance for current expected credit losses	(224)		(1,207)		1,849
Non-cash portion of interest expense	25,831		23,368		23,384
Settlement of accreted debt discount on redemption of unsecured senior notes	—		(8,500)		—
Losses from early extinguishments of debt	—		45,182		—
Other income - assignment fee	(6,624)		—		—
Gains on sales of real estate	(441,075)		(125,198)		(631,945)
Gain on sales-type lease	(10,058)		—		—
Unrealized loss on non-real estate investment	150		—		—
Change in assets and liabilities:
Tenant and other receivables, net	(7,621)		4,820		22,550
Notes receivable, net	(152)		(545)		(19)
Accrued rental income, net	(98,075)		(101,548)		(97,099)
Prepaid expenses and other assets	20,099		(20,811)		12,488
Lease liabilities - finance leases	—		—		568
Lease liabilities - operating leases	125		(23,599)		1,533
Accounts payable and accrued expenses	(22,777)		20,025		(4,059)
Accrued interest payable	8,989		(10,839)		16,211
Other liabilities	(24,120)		(28,739)		17,629
Tenant leasing costs	(84,057)		(62,850)		(79,772)
Total adjustments	250,277		491,456		118,101
Net cash provided by operating activities	1,282,399		1,133,227		1,156,840
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)		(222,260)		(137,976)
Construction in progress	(500,273)		(513,878)		(482,507)
Building and other capital improvements	(177,004)		(150,998)		(160,126)
Tenant improvements	(218,685)		(263,952)		(234,423)
Proceeds from sales of real estate	834,770		179,887		519,303
Proceeds from assignment fee	6,624		—		—
Capital contributions to unconsolidated joint ventures	(277,581)		(98,152)		(172,436)
Capital distributions from unconsolidated joint ventures	37,122		122		55,298
Proceeds from sale of investment in unconsolidated joint venture	—		17,789		—
Investment in non-real estate investments	(2,404)		—		—

129

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Issuance of notes receivable, net	—		—		(9,800)
Proceeds from notes receivable	10,000		10,035		6,397
Investments in securities, net	4,902		1,451		2,551
Net cash used in investing activities	(1,602,802)		(1,039,956)		(613,719)
Cash flows from financing activities:
Proceeds from mortgage notes payable	—		1,201,388		—
Repayments of mortgage notes payable	—		(832,296)		(17,168)
Proceeds from unsecured senior notes	749,557		1,695,996		1,248,125
Redemption of unsecured senior notes	—		(1,841,500)		—
Borrowings on unsecured line of credit	985,000		770,000		265,000
Repayments of unsecured line of credit	(1,130,000)		(625,000)		(265,000)
Borrowings on unsecured term loan	730,000		—		—
Repayment of unsecured term loan	—		(500,000)		—
Redemption of preferred units	—		(200,000)		—
Payments on finance lease obligations	—		1,250		—
Deferred financing costs	(8,460)		(20,757)		(10,416)
Debt issuance costs	—		(16,186)		—
Debt prepayment and extinguishment costs	—		(43,036)		—
Net activity from equity transactions	(352)		24,214		3,277
Distributions	(685,019)		(683,753)		(688,904)
Contributions from noncontrolling interests in property partnerships	849		18,002		8,219
Distributions to noncontrolling interests in property partnerships	(85,518)		(259,764)		(58,811)
Net cash provided by (used in) financing activities	556,057		(1,311,442)		484,322
Net increase (decrease) in cash and cash equivalents and cash held in escrows	235,654		(1,218,171)		1,027,443
Cash and cash equivalents and cash held in escrows, beginning of period	501,158		1,719,329		691,886
Cash and cash equivalents and cash held in escrows, end of period	$	736,812	$	501,158	$	1,719,329
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	452,692	$	1,668,742	$	644,950
Cash held in escrows, beginning of period	48,466		50,587		46,936
Cash and cash equivalents and cash held in escrows, beginning of period	$	501,158	$	1,719,329	$	691,886
Cash and cash equivalents, end of period	$	690,333	$	452,692	$	1,668,742
Cash held in escrows, end of period	46,479		48,466		50,587
Cash and cash equivalents and cash held in escrows, end of period	$	736,812	$	501,158	$	1,719,329
Supplemental disclosures:
Cash paid for interest	$	449,903	$	465,442	$	433,492
Interest capitalized	$	52,130	$	53,097	$	53,881

130

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)
	Year ended December 31,
	2022		2021		2020
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(119,534)	$	(238,003)	$	(99,494)
Change in real estate included in accounts payable and accrued expenses	$	97,586	$	(25,183)	$	(19,848)
Construction in progress, net deconsolidated	$	(11,316)	$	(299,947)	$	—
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	11,316	$	107,132	$	347,898
Sales-type lease origination	$	13,045	$	—	$	—
Derecognition of assets in exchange for sales-type lease obligation	$	(2,987)	$	—	$	—
Accrued rental income, net deconsolidated	$	—	$	—	$	(4,558)
Tenant leasing costs, net deconsolidated	$	—	$	—	$	(3,462)
Building and other capital improvements, net deconsolidated	$	—	$	—	$	(111,889)
Tenant improvements, net deconsolidated	$	—	$	—	$	(12,331)
Prepaid expense and other assets, net deconsolidated	$	—	$	(5,011)	$	—
Assumption of mortgage notes payable	$	—	$	200,311	$	—
Mortgage notes payable, net deconsolidation	$	—	$	(198,381)	$	—
Issuance of operating partnership units	$	—	$	99,689	$	—
Right-of-use assets obtained in exchange for lease liabilities	$	—	$	26,887	$	—
Distributions declared but not paid	$	170,643	$	169,859	$	171,082
Conversions of redeemable partnership units to partners’ capital	$	6,539	$	18,386	$	29,698
Issuance of restricted securities to employees and non-employee directors	$	48,417	$	44,405	$	42,607

The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1. Organization

BXP is a fully integrated, self-administered and self-managed REIT. BXP is the sole general partner of BPLP, its operating partnership, and at December 31, 2022 owned an approximate 89.6% (89.7% at December 31, 2021) general and limited partnership interest in BPLP. Unless stated otherwise or the context requires, the “Company” refers to BXP and its subsidiaries, including BPLP and its consolidated subsidiaries. Partnership interests in BPLP include:

•common units of partnership interest (also referred to as “OP Units”) and

•long term incentive units of partnership interest (also referred to as “LTIP Units”)

Unless specifically noted otherwise, all references to OP Units exclude units held by BXP. A holder of an OP Unit may present the OP Unit to BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, BPLP is obligated to redeem the OP Unit for cash equal to the value of a share of common stock of BXP (“Common Stock”). In lieu of such cash redemption, BXP may elect to acquire the OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that BXP owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock.

The Company uses LTIP Units as a form of time-based, restricted equity compensation and as a form of performance-based equity compensation for employees, and has previously granted LTIP Units in the form of (1) 2012 outperformance plan awards (“2012 OPP Units”) and (2) 2013 - 2022 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), each of which, upon the satisfaction of certain performance-based and time-based vesting conditions, is convertible into one OP Unit. The three-year measurement periods for the 2012 OPP Units and the 2013 - 2019 MYLTIP Units have ended and BXP’s total stockholder return (“TSR”) was sufficient for employees to earn and therefore become eligible to vest in a portion of the awards. Unless and until they are earned, the rights, preferences and privileges of the 2020 - 2022 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2019 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2020 - 2022 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2019 MYLTIP Units), whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Notes 9, 14 and 16).

Properties

At December 31, 2022, the Company owned or had joint venture interests in a portfolio of 194 commercial real estate properties (the “Properties”) aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.2 million net rentable square feet. At December 31, 2022, the Properties consisted of:

•173 office and life sciences properties (including 10 properties under construction/redevelopment);

•14 retail properties (including two properties under construction/redevelopment);

•six residential properties (including one property under construction); and

•one hotel.

The Company considers premier workplaces to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and professionally managed and maintained. As such, these properties attract high-quality tenants and command upper-tier rental rates.

All references to acres and square footage in the Notes are unaudited.

Basis of Presentation

The accompanying consolidated financial statements are presented using the accrual basis of accounting in conformity with accounting principles generally accepted in the United States of America. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its

132

own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving securities of BXP. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIEs”) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.

Variable Interest Entities (VIEs)

Consolidated VIEs are those for which the Company is considered to be the primary beneficiary of a VIE. The primary beneficiary is the entity that has a controlling financial interest in the VIE, which is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and (2) the obligation to absorb losses or the right to receive the returns from the VIE that could potentially be significant to the VIE. The assets of each VIE are only available to satisfy such VIE's respective liabilities. The Company has determined that it is the primary beneficiary for six of the seven entities that are VIEs as of December 31, 2022.

Consolidated Variable Interest Entities

As of December 31, 2022, BXP has identified six consolidated VIEs, including BPLP. Excluding BPLP, the VIEs consisted of the following five in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street.

The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities (excluding BPLP’s interest) are reflected as noncontrolling interests in property partnerships in the accompanying consolidated financial statements (See Note 9). 

In addition, BXP’s only significant asset is its investment in BPLP and, consequently, substantially all of BXP’s assets and liabilities are the assets and liabilities of BPLP.

Variable Interest Entities Not Consolidated

As of December 31, 2022, the Company has determined that the Platform 16 Holdings LP joint venture is a VIE. The Company does not consolidate this entity as the Company does not have the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and, therefore, the Company is not considered to be the primary beneficiary.

2. Summary of Significant Accounting Policies

Real Estate 

Upon acquisitions of real estate, the Company assesses whether the transaction should be accounted for as an asset acquisition or as a business combination by applying a screen to determine whether the integrated set of assets and activities acquired meets the definition of a business. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. The Company’s acquisitions of real estate or in-substance real estate generally will not meet the definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e. land, buildings, and related intangible assets) or because the acquisition does not include a substantive process in the form of an acquired workforce or an acquired contract that cannot be replaced without significant cost, effort or delay.

The Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

133

The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenants’ credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company’s allocation to customer relationship intangible assets has been immaterial. 

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company’s Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company’s evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses. 

Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. The evaluation of anticipated cash flows is subjective and is based in part on assumptions regarding anticipated hold periods, future occupancy, future rental rates, future capital requirements, discount rates and capitalization rates that could differ materially from actual results in future periods. Because cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset may be impaired, the Company’s established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company’s hold strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized, and such loss could be material. If the Company determines that an impairment has occurred, the affected assets must be reduced to their fair value. 

Guidance in Accounting Standards Codification (“ASC”) 360 “Property Plant and Equipment” requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. Discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). The components of the property’s net income that are reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by BXP’s Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that a sale of the property within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company capitalizes acquisition costs that it incurs to effect an asset acquisition and expenses acquisition costs that it incurs to effect a business combination, including legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific

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component of the project that benefited from the investment. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. The Company’s capitalization policy on development properties follows the guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate-General.” The costs of land and buildings under development include specifically identifiable costs.

Capitalized costs include pre-construction costs necessary to the development of the property, development costs (including architectural, engineering and design costs), construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary for the development of the property. The Company considers a construction project as substantially complete and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed, (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction or (3) if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $52.1 million, $53.1 million and $53.9 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $16.1 million, $13.7 million and $12.9 million, respectively. 

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period. 

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. The Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations. 

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents 

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000.

Cash Held in Escrows

Escrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs. Escrows also include cash held by qualified intermediaries for possible investments in like-kind exchanges in accordance with Section 1031 of the Internal Revenue Code, as amended (the “Code”), in connection with sales of the Company’s properties. 

Investments in Securities 

The Company accounts for investments in equity securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The Company maintains deferred compensation plans that are designed to allow officers and non-employee directors of BXP to defer a portion of the officer’s current income or the non-employee director’s current compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer or non-employee director. The Company’s obligation under the plans is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2022 and 2021, the Company had maintained approximately $32.3 million and $43.6 million, respectively, in separate accounts, which are not restricted as to their use. The Company recognized gains (losses) of approximately $(6.5) million, $5.6 million and $5.3 million on its investments in the

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accounts associated with the Company’s deferred compensation plans during the years ended December 31, 2022, 2021 and 2020, respectively.

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Notes Receivable

The Company accounts for notes receivable at their unamortized cost, net of any unamortized deferred fees or costs, premiums or discounts and an allowance for loan losses. Loan fees and direct costs associated with loans originated by the Company are deferred and amortized over the term of the note as interest income. 

Deferred Charges

Deferred charges include leasing costs and certain financing fees. Leasing costs include acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Unamortized leasing costs are charged to expense upon the early termination of the lease. Fully amortized deferred leasing costs are removed from the books upon the expiration of the lease. Financing fees included in deferred charges consist of external fees and costs incurred to obtain the Company’s revolving facility and if applicable, unsecured term loan and construction financing arrangements where there are not sufficient amounts outstanding to report the fees net of the debt liability. Such financing costs have been deferred and are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing. Fully amortized deferred financing costs are removed from the books upon the maturity of the debt.

External fees and costs incurred to obtain mortgage financings and unsecured senior notes have been deferred and are presented as direct deductions from the carrying amounts of the corresponding debt liability. Such financing costs are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing.

Non-Real Estate Investments

The Company measures its investments in non-real estate investments, which are primarily environmentally focused investment funds, at the readily determinable fair value of the investment. Changes in the fair value of these non-real estate investments are included in unrealized gain (loss) on non-real estate investments on the Consolidated Statements of Operations. The Company’s investment in non-real estate investments is shown within Prepaid and Other Assets in the Consolidated Balance Sheet. The Company recognized a net unrealized loss of approximately $0.2 million for the year ended December 31, 2022 due to the observable changes in fair value. Prior to the year ended December 31, 2022, the Company had not invested in non-real estate investments.

Investments in Unconsolidated Joint Ventures 

The Company consolidates VIEs in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have substantive participating rights. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance, and (2) the obligation to absorb losses and the right to receive the returns from the variable interest entity that could potentially be significant to the VIE. For ventures that are not VIEs, the Company consolidates entities for which it has significant decision making control over the ventures’ operations. The Company’s judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company’s ownership interest, its representation in the entity’s governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company’s assessment of its influence or control over an entity affects the presentation of these investments in the Company’s consolidated financial statements. In addition to evaluating control rights,

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the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member. 

Accounts of the consolidated entity are included in the accounts of the Company and the noncontrolling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company’s share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company’s recognition of joint venture income or loss generally follows the joint venture’s distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company classifies distributions received from equity method investees within its Consolidated Statements of Cash Flows using the nature of the distribution approach, which classifies the distributions received on the basis of the nature of the activity or activities of the investee that generated the distribution as either a return on investment (classified as cash inflows from operating activities) or a return of investment (classified as cash inflows from investing activities). The Company’s investments in unconsolidated joint ventures are reviewed for indicators of impairment on a quarterly basis and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. The Company will record an impairment charge if it determines that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value is calculated using discounted cash flows which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, debt interest rates and availability, discount rates and capitalization rates that could differ materially from actual results in future periods.

To the extent that the Company contributed assets to a joint venture, the Company’s investment in the joint venture was recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 610-20 “Gains and Losses from the Derecognition of Nonfinancial Assets” (“ASC 610-20”), the Company will recognize a full gain on both the retained and sold portions of real estate contributed or sold to a joint venture by recognizing its new equity method investment interest at fair value.

The combined summarized financial information of the unconsolidated joint ventures is disclosed in Note 6. 

Revenue Recognition

In general, the Company commences lease/rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. Contractual lease/rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $108.0 million, $104.3 million and $104.9 million for the years ended December 31, 2022, 2021 and 2020, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative lease/rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements.

The Company must estimate the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of tenants’ accrued rent and accounts receivable balances, management considers tenants’ creditworthiness, current economic trends and changes in tenants’ payment patterns, on a lease-by-lease basis. The Company writes-off the tenant’s receivable balance, including the accrued rent receivable, if the Company considers the balances no longer probable of collection. In addition, tenants in bankruptcy are analyzed and considerations are made in connection with the expected recovery of pre-petition and post-petition claims. If the Company deems the balances no longer probable of collection, the Company writes

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them off and ceases recognizing lease income, including straight-line rent, unless cash is received (See Note 4). Following a write-off, if (1) the Company subsequently determines that it is probable it will collect substantially all the remaining lessee’s lease payments under the lease term and (2) the lease has not been modified since the write-off, the Company will then reinstate the accrued rent and accounts receivable write-offs, adjusting for the amount related to the period when the lease payments were considered not probable of collection. If the Company’s estimates of collectability differs from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

The Company recognizes acquired in-place “above-” and “below-market” leases at their fair values as rental revenue over the original term of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $9.1 million, $4.2 million and $6.5 million for the years ended December 31, 2022, 2021 and 2020, respectively. The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2023	$	1,306	$	13,439
2024	401		9,811
2025	389		9,768
2026	389		8,647
2027	389		5,477

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred (See “Leases” ). The Company receives reimbursements of payroll and payroll related costs from unconsolidated joint venture entities and third party property owners in connection with management services contracts which the Company reflects on a gross basis instead of on a net basis as the Company has determined that it is the principal and not the agent under these arrangements in accordance with the guidance in ASC 606 “Revenue from Contracts with Customers” (“ASC 606”).

The Company’s parking revenue is derived primarily from monthly and transient daily parking. In addition, the Company has certain lease arrangements for parking accounted for under the guidance in ASC 842 “Leases” (“ASC 842”). The monthly and transient daily parking revenue falls within the scope of ASC 606 and is accounted for at the point in time when control of the goods or services transfers to the customer and the Company’s performance obligation is satisfied.

The Company’s hotel revenue is derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenue is recognized as the hotel rooms are occupied and the services are rendered to the hotel customers.

The Company earns management and development fees. Development and management services revenue is earned from unconsolidated joint venture entities and third-party property owners. The Company determined that the performance obligations associated with its development services contracts are satisfied over time and that the Company would recognize its development services revenue under the output method evenly over time from the development commencement date through the substantial completion date of the development management services project due to the stand-ready nature of the contracts. Significant judgments impacting the amount and timing of revenue recognized from the Company’s development services contracts include estimates of total development project costs from which the fees are typically derived and estimates of the period of time until substantial completion of the development project, the period of time over which the development services are required to be performed. The Company recognizes development fees earned from unconsolidated joint venture projects equal to its cost plus profit to the extent of the third party partners’ ownership interest. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 610-20. Under ASC 610-20, the Company must first determine whether the transaction is a sale to a customer or non-customer. The

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Company typically sells real estate on a selective basis and not within the ordinary course of its business and therefore expects that its sale transactions will not be contracts with customers. The Company next determines whether it has a controlling financial interest in the property after the sale, consistent with the consolidation model in ASC 810 “Consolidation” (“ASC 810”). If the Company determines that it does not have a controlling financial interest in the real estate, it evaluates whether a contract exists under ASC 606 and whether the buyer has obtained control of the asset that was sold. The Company recognizes a full gain on sale of real estate when the derecognition criteria under ASC 610-20 have been met.

Leases 

Lessee

For leases in which the Company is the lessee (generally ground leases), in accordance with ASC 842 the Company recognizes a right-of-use asset and a lease liability. The Company made the policy election to not apply the requirements of ASC 842 to short-term leases. This policy election is made by class of underlying assets and as described below, the Company considers real estate to be a class of underlying assets, and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature. The Company will recognize the lease payments it pays in net income on a straight-line basis over the lease term.

The lease liability is equal to the present value of the minimum lease payments in accordance with ASC 842. The Company will use its incremental borrowing rate (“IBR”) to determine the net present value of the minimum lease payments. In order to determine the IBR, the Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. The approach required significant judgment. Therefore, the Company utilized different data sets to estimate base IBRs via an analysis of the following weighted-components:

•the interpolated rates from yields on outstanding U.S. Treasury issuances for up to 30 years and for years 31 and beyond, longer-term publicly traded educational institution debt issued by high credit quality educational institutions with maturity dates exceeding 31 years,

•observable mortgage rates spread over U.S. Treasury issuances, and

•unlevered property yields and discount rates.

The Company then applied adjustments to account for considerations related to term and interpolated the IBR.

Lessor

Operating Leases

The Company leases primarily premier workplaces, including office, life sciences, retail and residential space to tenants. These leases may contain extension and termination options that are predominately at the sole discretion of the tenant, provided certain conditions are satisfied. In a few instances, the leases also contain purchase options, which would be exercisable at fair market value. Also, certain of the Company’s leases include rental payments that are based on a percentage of the tenant sales in excess of contractual amounts.

Per ASC 842, lessors do not need to separate nonlease components from the associated lease component if certain criteria stated above are met for each class of underlying assets. The guidance in ASC 842 defines “underlying asset” as “an asset that is the subject of a lease for which a right to use that asset has been conveyed to a lessee. The underlying asset could be a physically distinct portion of a single asset.” Based on the above guidance, the Company considers real estate assets as a class of underlying assets and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature.

Lease components are elements of an arrangement that provide the customer with the right to use an identified asset. Nonlease components are distinct elements of a contract that are not related to securing the use of the leased asset and revenue is recognized in accordance with ASC 606. The Company considers common area maintenance (CAM) and service income associated with tenant work orders to be nonlease components because they represent delivery of a separate service but are not considered a cost of securing the identified asset. In the case of the Company’s business, the identified asset would be the leased real estate (office, life sciences, retail or residential).

The Company assessed and concluded that the timing and pattern of transfer for nonlease components and the associated lease component are the same. The Company determined that the predominant component was the lease component and as such its leases will continue to qualify as operating leases and the Company has made a

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policy election to account for and present the lease component and the nonlease component as a single component in the revenue section of the Consolidated Statements of Operations labeled Lease.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred. The Company recognizes these reimbursements on a gross basis, as the Company obtains control of the goods and services before they are transferred to the tenant.

In addition, in accordance with ASC 842, lessors will only capitalize incremental direct leasing costs.

Sales-Type Leases

Sales-type lease receivables are recognized when a lease qualifies as a sales-type lease. The sales-type lease receivable is initially measured at the present value of the fixed and determinable lease payments, including any guaranteed or unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease. The Company evaluates its sales-type lease receivable for impairment under the current expected credit loss standard. Interest income is recognized under the effective interest method. The effective interest method produces a constant yield on the sales-type lease receivable over the term of the lease. Income from these leases are classified as Lease Revenue within the Consolidated Statement of Operations.

Earnings Per Share 

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of BPLP that are exchangeable for Common Stock.

Earnings Per Common Unit

Basic earnings per common unit is computed by dividing net income available to common unitholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of common units outstanding during the year. Diluted earnings per common unit reflects the potential dilution that could occur from units issuable in connection with awards under BXP’s stock-based compensation plans, including upon the exercise of stock options, and conversion of preferred units of BPLP.

Recurring Fair Value of Financial Instruments

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for December 31, 2022 and 2021, the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Sales-type lease receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading volume for the period is low, the valuation could be categorized as Level 2.

Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from those estimates.

In addition, the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.

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The following table presents the aggregate carrying value of the Company’s related party note receivable, net, notes receivable, net, sales-type lease receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,576	$	79,220	$	78,336	$	82,867
Note receivable, net	—		—		9,641		10,000
Sales-type lease receivable, net	12,811		13,045		—		—
Total	$	91,387	$	92,265	$	87,977	$	92,867
Mortgage notes payable, net	$	3,272,368	$	2,744,479	$	3,267,914	$	3,395,569
Unsecured senior notes, net	10,237,968		9,135,512		9,483,695		9,966,591
Unsecured line of credit	—		—		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	14,240,336	$	12,609,991	$	12,896,609	$	13,507,477

The Company uses interest rate swap agreements to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. The Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the Consolidated Balance Sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for both the effective and ineffective portions of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the fair value of the derivative to earnings over the term that the hedged transaction affects earnings and in the same line item as the hedged transaction within the statements of operations.

During the year ended December 31, 2020, the Company elected to apply hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. The Company’s application of this expedient preserves the presentation of derivatives consistent with past presentation.

Stock-Based Employee Compensation Plans

At December 31, 2022, the Company had a stock-based employee compensation plan. The Company accounts for the plan under the guidance in ASC 718 “Compensation – Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

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Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as COVID-19, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.

BXP

Equity Offering Costs 

Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital. 

Treasury Stock 

BXP’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity. 

Dividends 

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation. 

The tax treatment of common dividends per share for federal income tax purposes is as follows: 

	For the year ended December 31,
	2022					2021					2020
	Per Share			%		Per Share			%		Per Share			%
Ordinary income	$	3.42		86.60	%	$	2.90		73.86	%	$	2.52		64.91	%
Capital gain income	0.53			13.40	%	0.57			14.57	%	0.99			25.49	%
Return of capital	—			—	%	0.45			11.57	%	0.37			9.60	%
Total	$	3.95	(1)	100.00	%	$	3.92	(2)	100.00	%	$	3.88	(3)	100.00	%

 _____________

(1)The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.

(2)The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.

(3)The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.

Income Taxes 

BXP has elected to be treated as a REIT under Sections 856 through 860 of the Code, commencing with its taxable year ended December 31, 1997. As a result, it generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income (with certain adjustments). BXP’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BXP’s consolidated taxable REIT subsidiaries. BXP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BXP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BXP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

142

The Company owns a hotel property that it leases to one of its taxable REIT subsidiaries and that is managed by Marriott International, Inc. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, if applicable, BXP has recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020. 

Certain entities included in BXP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements. 

BPLP

Income Taxes 

The partners are required to report their respective share of BPLP’s taxable income or loss on their respective tax returns and are liable for any related taxes thereon. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BPLP’s consolidated taxable REIT subsidiaries. BPLP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BPLP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BPLP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, BPLP has, if applicable, recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020.

Certain entities included in BPLP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

3. Real Estate

BXP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,189,811	$	5,061,169
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,820,724		14,291,214
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,794,524		24,159,915
Less: Accumulated depreciation	(6,298,082)		(5,883,961)
	$	19,496,442	$	18,275,954

_______________

(1)Includes pre-development costs.

143

BPLP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,095,102	$	4,964,986
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,547,919		14,014,010
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,427,010		23,786,528
Less: Accumulated depreciation	(6,180,474)		(5,772,018)
	$	19,246,536	$	18,014,510

_______________

(1)Includes pre-development costs.

Acquisitions

On May 17, 2022, the Company completed the acquisition of Madison Centre in Seattle, Washington for a net purchase price, including transaction costs, of approximately $724.3 million. The acquisition was completed using the proceeds from BPLP’s $730.0 million unsecured term loan (See Note 7). Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace. The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

On September 16, 2022, the Company acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property. The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre and 125 Broadway as of their acquisition dates for each of the five succeeding fiscal years (in thousands):

144

	Acquired In-Place Lease Intangibles	Acquired Above-Market Lease Intangibles	Acquired Below-Market Lease Intangible
2023	20,940	1,098	6,417
2024	19,582	254	6,386
2025	19,510	254	6,373
2026	19,046	254	6,185
2027	17,901	254	5,780

125 Broadway contributed approximately $11.4 million of revenue and approximately $3.3 million of net income to the Company for the period from September 16, 2022 through December 31, 2022. Madison Centre contributed approximately $32.0 million of revenue and approximately $2.1 million of net income to the Company for the period from May 17, 2022 through December 31, 2022.

Dispositions

On March 31, 2022, the Company completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property. 195 West Street contributed approximately $0.4 million of net income to the Company from January 1, 2022 through March 30, 2022 and contributed approximately $0.5 million and $(0.8) million of net income (loss) to the Company for the years ended December 31, 2021 and 2020, respectively.

On April 19, 2021, the Company entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, the Company executed an agreement to assign its right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and are reflected as Other income - assignment fee in the Company's Consolidated Statements of Operations. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

On June 15, 2022, the Company completed the sale of its suburban Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet. Virginia 95 Office Park contributed approximately $2.3 million of net income to the Company from January 1, 2022 through June 14, 2022 and contributed approximately $7.0 million and $7.8 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

On August 30, 2022, the Company completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace. 601 Massachusetts Avenue contributed approximately $14.9 million of net income to the Company for the period from January 1, 2022 through August 29, 2022, respectively, and contributed approximately $22.4 million and $21.8 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

On September 15, 2022, the Company completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

On November 8, 2022, the Company completed the sale of the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141.0 million. Net cash proceeds totaled approximately $139.6 million, resulting in a gain on sale of real estate of approximately $55.6 million for BXP and BPLP. The Avant at Reston Town Center is a 15-story, 359-unit, luxury multifamily building consisting of approximately 329,000 net rentable square feet, excluding retail space. The Company retained ownership of the approximately 26,000 square foot ground-level retail space. The Avant at Reston Town Center contributed approximately $4.1 million of net income to the Company for the period from January 1, 2022 through November 7, 2022, respectively, and contributed approximately $4.0 million and $4.0 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

145

Developments/Redevelopments

On April 27, 2022, the Company entered into a 15-year lease agreement with AstraZeneca for approximately 566,000 net rentable square feet at the Company’s 290 Binney Street future development project. 290 Binney Street is part of the initial phase of a future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. The full project is expected to consist of two buildings aggregating approximately 1.1 million rentable square feet of life sciences space and an approximately 400,000 square foot residential building (See Note 16).

On April 29, 2022, the Company partially placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC.

On May 13, 2022, the Company commenced the development of Reston Next Office Phase II, a premier workplace project located in Reston, Virginia. When completed, the building will consist of approximately 90,000 net rentable square feet.

On June 29, 2022, the Company completed and fully placed in-service 325 Main Street, a premier workplace project with approximately 414,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2022, the Company commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet.

On September 8, 2022, the Company terminated its existing lease agreement with its tenant at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space (See Note 16).

On September 12, 2022, the Company commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet.

On October 19, 2022, the Company completed and fully placed in-service Reston Next, a premier workplace project consisting of two buildings with an aggregate of approximately 1.1 million net rentable square feet, located in Reston, Virginia.

On November 30, 2022, the Company commenced the redevelopment of 105 Carnegie Center, located in Princeton, New Jersey. The redevelopment is a repositioning of the property. 105 Carnegie Center consisted of approximately 70,000 net rentable square feet of office space. When completed, the building will consist of approximately 73,000 net rentable square feet of laboratory/life sciences space.

On December 1, 2022, the Company removed 2096 Gaither Road from its in-service portfolio following the expiration of the last leases on November 30, 2022. 2096 Gaither Road consisted of approximately 50,000 net rentable square feet of office space in the Company’s Shady Grove Innovation District, located in Rockville, Maryland. The Company anticipates it will redevelop or convert 2096 Gaither Road to support lab or life sciences-related uses.

On December 23, 2022, the Company completed and fully placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts.

4. Leases

The Company estimates the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of these accrued rent and accounts receivable balances, management considers tenant creditworthiness, current economic trends and changes in tenants’ payment patterns, on a lease-by-lease basis. During the years ended December 31, 2021 and 2020, the Company wrote off approximately $1.3 million and $90.3 million, respectively, related to accrued rent, net balances and accounts receivable, net balances. The write-offs were for tenants, primarily in the retail and co-working sectors, that either terminated their leases or for which the Company determined their accrued rent and/or accounts receivable balances were no longer probable of collection.

146

In April 2020, the FASB staff issued a question and answer document (“Lease Modification Q & A”) related to the application of lease accounting guidance for lease concessions, in accordance with ASC 842, as a result of COVID-19. The Company did not utilize the guidance provided in the Lease Modification Q & A and instead elected to continue to account for the COVID-19 lease concessions on a lease-by-lease basis in accordance with the existing lease modification accounting framework.

During the year ended December 31, 2022, the Company determined it was probable of collecting

substantially all of certain clients’ accrued rent and account receivable balances and, therefore, ceased recognizing

revenue from such clients on a cash basis. As a result of returning these clients to accrual basis accounting, the

Company reinstated approximately $1.5 million of accrued rent balances during the year ended December 31, 2022.

Lessee

The Company has four non-cancelable ground lease obligations, as lessee, which were classified as operating leases, with various initial term expiration dates through 2114 for the years ended December 31, 2022, 2021 and 2020. The Company recognizes ground rent expense on a straight-line basis over the term of the respective ground lease agreements. As of December 31, 2022, none of the amounts disclosed below for these ground leases contain variable payments, extension options or residual value guarantees.

The Company has four finance lease obligations with various initial term expiration dates through 2094 for the years ended December 31, 2022, 2021 and 2020.

The following table provides lease cost information for the Company’s operating and finance leases for the years ended December 31, 2022, 2021 and 2020 (in thousands):

	Year ended December 31,
Lease costs	2022		2021		2020
Operating lease costs	$	12,700	$	13,151	$	13,948
Finance lease costs
Amortization of right of use asset (1)	$	697	$	547	$	56
Interest on lease liabilities (2)	$	3,236	$	2,471	$	583

_______________

(1)The finance leases relate to either land, buildings or assets that remain in development. For land leases classified as finance leases because of a purchase option that the Company views as an economic incentive, the Company follows its existing policy and does not depreciate land because it is assumed to have an indefinite life. For all other finance leases, the Company would amortize the right of use asset over the shorter of the useful life of the asset or the lease term. If the finance lease relates to a property under development, the amortization of the right of use asset may be eligible for capitalization. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company’s policy.

(2)One, two and three of the finance leases relate to assets under development for all or a portion of the years ended December 31, 2022, December 31, 2021 and December 31, 2020, respectively, and as such, a portion of the interest amount was capitalized.

The following table provides other quantitative information for the Company’s operating and finance leases as of December 31, 2022 and December 31, 2021:

	December 31, 2022		December 31, 2021
Other information
Weighted-average remaining lease term (in years)
Operating leases	49		50
Finance leases	68		69
Weighted-average discount rate
Operating leases	5.7	%	5.7	%
Finance leases	6.2	%	6.2	%

147

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2022 (in thousands):

	Operating		Finance
2023	$	22,415	$	9,306
2024 (1)	22,274		49,343
2025	10,308		9,971
2026	10,100		10,166
2027	9,885		10,364
Thereafter	528,915		1,352,647
Total lease payments	603,897		1,441,797
Less:
Interest portion	399,211		1,192,462
Present value of lease payments	$	204,686	$	249,335

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2021 (in thousands):

	Operating		Finance
2022	$	19,623	$	8,762
2023	25,333		10,826
2024 (1)	10,085		48,605
2025	10,307		9,971
2026	10,100		10,166
Thereafter	538,801		1,363,011
Total lease payments	614,249		1,451,341
Less:
Interest portion	409,688		1,206,920
Present value of lease payments	$	204,561	$	244,421

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

Lessor

Operating Leases

The following table summarizes the components of lease revenue recognized during the years ended December 31, 2022, 2021 and 2020 included within the Company's Consolidated Statements of Operations (in thousands):

	Year ended December 31,
Lease Revenue	2022		2021		2020
Fixed contractual payments	$	2,426,007	$	2,319,362	$	2,211,915
Variable lease payments	492,361		433,652		434,346
	$	2,918,368	$	2,753,014	$	2,646,261

The future contractual lease payments to be received (excluding operating expense reimbursements and percentage rent) by the Company as of December 31, 2022, under non-cancelable operating leases which expire on various dates through 2049 (in thousands): 

148

Years Ending December 31,
2023	$	2,338,610
2024	2,321,135
2025	2,279,700
2026	2,212,455
2027	2,094,014
Thereafter	13,020,102

No single tenant represented more than 10.0% of the Company’s total lease revenue for the years ended December 31, 2022, 2021 and 2020.

Sales-type Lease

On July 29, 2020, the Company entered into a 99-year ground lease with a third-party hotel developer for land at its Reston Next property located in Reston, Virginia, which will support the development of a 267-room, approximately 241,000 square foot hotel property. The lease commenced on October 21, 2020 and upon commencement, the Company performed classification testing. The ground lease was subject to termination rights and as of the lease commencement date, the Company was not reasonably certain that those termination rights would not be exercised. As such, the Company accounted for the ground lease as an operating lease. On December 19, 2022, the Company amended the ground lease which included the elimination of the termination rights. As a result, this lease was reclassified as a sales-type lease.

The Company recorded a sales-type lease receivable of approximately $13.0 million, which includes an unguaranteed residual asset of approximately $17,000. The sales-type lease receivable was measured as the present value of the fixed and determinable lease payments, including the unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease.

In addition, the Company recorded a gain on sales-type lease of approximately $10.1 million associated with the derecognition of the asset. The Company did not recognize any interest income during the year ended December 31, 2022.

The following table provides the future contractual payments to be received as of December 31, 2022 (in thousands):

	Sales-Type
2023	$	—
2024	31
2025	124
2026	372
2027	756
Thereafter	268,249
Total lease payments to be received	269,532
Less:
Interest portion	256,504
Sales-type lease receivable	13,028
Unguaranteed residual asset	17
Current expected credit loss adjustment	(234)
Sales-type lease receivable, net	$	12,811

149

5. Deferred Charges

Deferred charges consisted of the following at December 31, 2022 and 2021 (in thousands): 

	December 31, 2022		December 31, 2021
Leasing costs, including lease related intangibles	$	1,095,231	$	1,011,229
Financing costs	19,311		19,231
	1,114,542		1,030,460
Less: Accumulated amortization	(381,260)		(411,662)
	$	733,282	$	618,798

The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2023	$	27,659
2024	21,595
2025	21,419
2026	20,571
2027	18,214

150

6. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			December 31, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,198)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,629)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,493)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,971		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,185)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		46,839		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,414		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,366		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,716		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,465		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%	(5)	(19,921)		28,412
CA-Colorado Center, LLC	Colorado Center	50.00	%		233,862		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,152		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,397		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		164,735		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(6)	158,109		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(7)	324,038		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,000		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(8)	69,785		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(9)	114,992		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(10)	11,351		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(7)	80,714		N/A
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		120,083		N/A
					$	1,630,485	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

(2)The Company’s economic ownership has increased based on the achievement of certain return thresholds. At December 31, 2022 and December 31, 2021, the Company’s economic ownership was approximately 50%.

(3)The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.

(4)Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This property includes net equity balances from the amenity joint venture.

(6)This entity is a VIE (See Note 2).

(7)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(8)The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.

(9)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

151

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(10)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

Certain of the Company’s unconsolidated joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. Under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, the partners or the Company will be entitled to an additional promoted interest or payments.

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	December 31, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,537,554	$	5,579,218
Other assets	756,786		586,470
Total assets	$	7,294,340	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,022,746	$	3,214,961
Other liabilities (2)	716,271		652,135
Members’/Partners’ equity	2,555,323		2,298,592
Total liabilities and members’/partners’ equity	$	7,294,340	$	6,165,688
Company’s share of equity	$	1,238,929	$	1,104,175
Basis differentials (3)	391,556		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,630,485	$	1,445,926

_______________

(1)At December 31, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At December 31, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.2 million and $22.3 million, respectively.

(2)At December 31, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $382.2 million and $385.5 million, respectively. At December 31, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 million, respectively.

(3)This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The majority of the Company’s basis differences are as follows:

	December 31, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	301,820	$	304,776
200 Fifth Avenue	94,497		N/A
Gateway Commons	47,808		51,009
Dock 72	(98,980)		(50,051)

These basis differentials (excluding land) will be amortized over the remaining lives of the related assets and liabilities.

(4)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

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The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows: 

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Total revenue (1)	$	512,078	$	383,649	$	319,560
Expenses
Operating	198,632		158,498		144,347
Transaction costs	837		470		1,027
Depreciation and amortization	181,041		147,121		141,853
Total expenses	380,510		306,089		287,227
Other income (expense)
Loss from early extinguishment of debt	(1,327)		—		—
Interest expense	(154,065)		(108,884)		(98,051)
Unrealized gain on derivative instruments	1,681		—		—
Gains on sales of real estate (2)	—		—		11,737
Net loss	$	(22,143)	$	(31,324)	$	(53,981)
Company’s share of net loss	$	(2,551)	$	(10,254)	$	(16,256)
Gain on sale of investment (3)	—		10,257		—
Impairment loss on investment (4)	(50,705)		—		(60,524)
Basis differential (5)	(6,584)		(2,573)		(8,330)
Loss from unconsolidated joint ventures	$	(59,840)	$	(2,570)	$	(85,110)

_______________ 

(1)Includes straight-line rent adjustments of approximately $62.9 million, $17.2 million and $(10.1) million for the years ended December 31, 2022, 2021 and 2020, respectively.

(2)For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

(3)During the year ended December 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.

(4)During the years ended December 31, 2022 and December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million and $60.5 million, respectively.

(5)Includes straight-line rent adjustments of approximately $0.5 million, $0.8 million and $1.8 million for the years ended December 31, 2022, 2021 and 2020, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million, $0.4 million and $0.9 million for the years ended December 31, 2022, 2021 and 2020, respectively.

On January 18, 2022, a joint venture in which the Company owns a 50% interest commenced the redevelopment of 651 Gateway located in South San Francisco, California. 651 Gateway is a premier workplace that is being converted to approximately 327,000 net rentable square feet of life sciences space.

On February 2, 2022, a joint venture in which the Company owns a 55% interest commenced the development of the first phase of Platform 16, a premier workplace project located in San Jose, California, that is expected to contain approximately 1.1 million net rentable square feet upon completion. The first phase of the development projects includes the construction of an approximately 390,000 net rentable square foot premier workplace building and a below-grade parking garage.

On March 28, 2022, a joint venture in which the Company owns a 20% interest refinanced with a new lender the debt secured by its Metropolitan Square property located in Washington, DC. At the time of the refinancing, the loan had an outstanding balance of approximately $294.1 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.65%, plus (2) 4.75% per annum and was scheduled to mature on July 7, 2022, with two, one-year extension options, subject to certain conditions. There was no prepayment penalty associated with

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the prepayment of the previous mortgage loan. The joint venture recognized a loss from early extinguishment of debt totaling approximately $1.3 million due to the write-off of unamortized deferred financing costs. In conjunction with the refinancing, the joint venture settled its interest rate cap agreement, entered into in 2020, to limit its exposure to increases in the LIBOR rate. The new mortgage and mezzanine loans have an aggregate principal balance of $420.0 million, bear interest at a weighted average variable rate equal to the Secured Overnight Financing Rate (“SOFR“) plus 2.75% per annum and mature on April 9, 2024, with three, one-year extension options, subject to certain conditions. The joint venture distributed excess loan proceeds from the new mortgage and mezzanine loans totaling approximately $100.5 million, of which the Company’s share totaled approximately $20.1 million. On September 1, 2022, the joint venture entered into an interest rate cap agreement that capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

On April 18, 2022, a joint venture in which the Company owns a 50% interest extended the maturity date of the construction loan collateralized by its Hub50House property to June 19, 2022. At the time of the extension, the loan had an outstanding balance of approximately $176.5 million, bore interest at a variable rate equal to LIBOR plus 2.00% per annum and was scheduled to mature on April 19, 2022. On June 17, 2022, the joint venture repaid the existing construction loan and obtained a new mortgage loan. The new mortgage loan has a principal balance of $185.0 million, bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. At closing, the joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts. In conjunction with the new mortgage loan, the joint venture paid off the existing construction loan. At the time of the payoff of the construction loan, the outstanding balance of the loan totaled approximately $176.7 million. The joint venture distributed excess loan proceeds from the new mortgage loan totaling approximately $6.8 million, of which the Company’s share totaled approximately $3.4 million. Hub50House is a residential property that consists of approximately 320,000 net rentable square feet and 440 residential units located in Boston, Massachusetts.

On May 13, 2022, the Company entered into a joint venture with a third party to own, operate and develop Reston Next Residential located in Reston, Virginia. Reston Next Residential is expected to consist of 508 residential rental units upon completion. The Company contributed approximately $11.3 million of improvements at closing and will contribute cash totaling approximately $3.5 million post closing for its 20% ownership interest in the joint venture. The partner contributed approximately $0.5 million of cash at closing and will contribute cash totaling approximately $58.7 million in the future for its 80% ownership interest in the joint venture. As a result of the partner’s deferred contribution, as of the acquisition date, the Company owned an approximately 96% interest in the joint venture. On May 13, 2022, the joint venture commenced development and entered into a construction loan collateralized by the property. The construction loan has a principal amount of up to $140.0 million, bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

On June 16, 2022, the Company entered into a joint venture with a third party to own, operate and develop 751 Gateway, a laboratory building located in South San Francisco, California, that is expected to be approximately 231,000 net rentable square feet upon completion. 751 Gateway was previously part of the Company’s Gateway Commons joint venture. The Company contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $2.6 million for its 49% ownership interest in the joint venture. The partner contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $4.9 million for its 51% ownership interest in the joint venture.

On August 8, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bore interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, has a total commitment amount of approximately $198.4 million, and continued to mature on December 18, 2023. On December 22, 2022, the joint venture further modified the construction loan. The further modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 2.50% per annum, has a total commitment amount of approximately $198.4 million, and matures on December 18, 2025. During December 2022, the Company recognized a non-cash impairment charge totaling approximately $50.7 million, which represented the other-than temporary decline in the fair value below the carrying value of the Company’s investment in the unconsolidated joint venture that owns Dock 72. The Company assessed the impairment and concluded that it was other than temporary. The Company determined that its valuation of the

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investment was categorized within Level 3 of the fair value hierarchy, as it utilized significant unobservable inputs in its assessment including an exit capitalization rate of 5.75%, a discount rate on the Company’s equity investment (the property is encumbered by mortgage debt) of 7.0% and leasing the currently available space over the period of 2023-2026. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

On September 9, 2022, a joint venture in which the Company owns an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan had an outstanding balance of approximately $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

On November 17, 2022, the Company acquired a 26.69% interest in the joint venture that owns 200 Fifth Avenue located in New York, New York, for a gross purchase price of approximately $280.2 million, which included $120.1 million of cash and the Company’s pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum and matures on November 24, 2028. The joint venture has interest rate swap contracts with notional amounts aggregating $600.0 million through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts. 200 Fifth Avenue is a 14-story, approximately 855,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket.

On December 7, 2022, a joint venture in which the Company owns a 50% interest modified the mortgage loan collateralized by its Market Square North property located in Washington, DC. At the time of the modification the loan had an outstanding balance of approximately $125.0 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.50%, plus (2) 2.30% per annum, and was scheduled to mature on November 10, 2025, with one, one-year extension option subject to certain conditions. The modified mortgage loan bears interest at a variable rate equal to the greater of (1) the sum of (x) the “benchmark rate”, (y) 2.30% and (z) the adjustment applicable to such “benchmark rate” (approximately 0.11% for Term SOFR), or (2) 2.80%. For the period December 7, 2022 through March 9, 2023, the “benchmark rate” means LIBOR, and for the period after March 10, 2023, through the maturity date, Term SOFR. The modified mortgage loan continues to mature on November 10, 2025, with a one-year extension option subject to certain conditions. Market Square North is a premier workplace with approximately 418,000 net rentable square feet located in Washington, DC.

On December 23, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its The Hub on Causeway – Podium property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $174.3 million, bore interest at a variable rate equal to LIBOR plus 2.25% per annum, and was scheduled to mature on September 6, 2023. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 2.25% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan bears interest at a variable rate equal to Term SOFR plus 2.35% per annum. The modified construction loan continues to mature on September 6, 2023. The Hub on Causeway – Podium is a premier workplace with approximately 380,000 net rentable square feet located in Boston, Massachusetts.

On December 23, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its 100 Causeway Street property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $337.6 million, bore interest at a variable rate equal to LIBOR plus 1.50% per annum, and was scheduled to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 1.50% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan will bear interest at a variable rate equal to Term SOFR plus 1.60% per annum. The modified construction loan continues to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. 100 Causeway Street is a premier workplace with approximately 630,000 net rentable square feet located in Boston, Massachusetts.

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7. Debt

Mortgage Notes Payable

The Company had outstanding mortgage notes payable totaling approximately $3.3 billion as of December 31, 2022 and 2021, each collateralized by one or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly installments and mature at various dates through January 9, 2032.

Fixed rate mortgage notes payable totaled approximately $3.3 billion at December 31, 2022 and 2021, with contractual interest rates ranging from 2.79% to 3.43% per annum at December 31, 2022 and 2021 (with a weighted-average interest rate of 3.24% at December 31, 2022 and 2021). There were no variable rate mortgage loans at December 31, 2022 and 2021.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2022 are as follows (dollars in thousands): 

	Principal Payments
2023	$	—
2024	—
2025	—
2026	—
2027	2,300,000
Thereafter	1,000,000
Total aggregate principal payments	3,300,000
Less:
Deferred financing costs, net	27,632
Total carrying value of mortgage notes payable, net	$	3,272,368

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2022 (dollars in thousands): 

	Coupon/Stated Rate		Effective Rate(1)		Principal Amount		Maturity Date(2)
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	$	500,000	September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000		February 1, 2024
7 Year Unsecured Senior Notes	3.200	%	3.350	%	850,000		January 15, 2025
10 Year Unsecured Senior Notes	3.650	%	3.766	%	1,000,000		February 1, 2026
10 Year Unsecured Senior Notes	2.750	%	3.495	%	1,000,000		October 1, 2026
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
10 Year Unsecured Senior Notes	4.500	%	4.628	%	1,000,000		December 1, 2028
10 Year Unsecured Senior Notes	3.400	%	3.505	%	850,000		June 21, 2029
10.5 Year Unsecured Senior Notes	2.900	%	2.984	%	700,000		March 15, 2030
10.75 Year Unsecured Senior Notes	3.250	%	3.343	%	1,250,000		January 30, 2031
11 Year Unsecured Senior Notes	2.550	%	2.671	%	850,000		April 1, 2032
12 Year Unsecured Senior Notes	2.450	%	2.524	%	850,000		October 1, 2033
Total principal					10,300,000
Less:
Net unamortized discount					14,094
Deferred financing costs, net					47,938
Total					$	10,237,968

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(1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

(2)No principal amounts are due prior to maturity.

On November 17, 2022, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.750% unsecured senior notes due 2027. The notes were priced at 99.941% of the principal amount to yield an effective rate (including financing fees) of approximately 6.924% per annum to maturity. The notes will mature on December 1, 2027, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $743.5 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2022, BPLP was in compliance with each of these financial restrictions and requirements.

Unsecured Credit Facility

On June 15, 2021, BPLP amended and restated its prior credit facility (as amended and restated, the “2021 Credit Facility”). The 2021 Credit Facility provides for borrowings of up to $1.5 billion through the Revolving Facility, subject to customary conditions. Among other things, the 2021 Credit Facility (1) extended the maturity date from April 24, 2022 to June 15, 2026, (2) eliminated the $500.0 million delayed draw facility, (3) reduced the per annum variable interest rates on borrowings and (4) added a sustainability-linked pricing component. Under the 2021 Credit Facility, BPLP may increase the total commitment by up to $500.0 million by increasing the amount of the Revolving Facility and/or by incurring one or more term loans, in each case, subject to syndication of the increase and other conditions.

At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating. The 2021 Credit Facility includes provisions which allow LIBOR Daily Floating Rate to be switched to SOFR.

The 2021 Credit Facility also features a sustainability-linked pricing component such that if BPLP meets certain sustainability performance targets, the applicable per annum interest rate will be reduced by one basis point. The LIBOR replacement provisions in the 2021 Credit Facility permit the use of rates based on the secured overnight financing rate administered by the Federal Reserve Bank of New York plus an applicable spread adjustment. In addition, the 2021 Credit Facility contains a competitive bid option for up to 65% of the Revolving Facility that allows banks that are part of the lender consortium to bid to make loan advances to BPLP at a reduced interest rate.

Pursuant to the 2021 Credit Facility, BPLP is obligated to pay (1) in quarterly installments a facility fee on the total commitment under the Revolving Facility at a rate per annum ranging from 0.10% to 0.30% based on BPLP’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit ranging from 0.70% to 1.40% based on BPLP’s credit rating.

Based on BPLP’s December 31, 2022 credit rating, (1) the applicable Eurocurrency and LIBOR Daily Floating Rate margins are 0.775%, (2) the alternate base rate margin is zero basis points and (3) the facility fee is 0.15% per annum.

At December 31, 2022, BPLP had no amount outstanding under its Revolving Facility. At December 31, 2021, BPLP had $145.0 million outstanding under its Revolving Facility.

Unsecured Term Loan

On May 17, 2022, BPLP entered into the 2022 Unsecured Term Loan, which provided for a single borrowing of up to $730.0 million. The 2022 Unsecured Term Loan matures on May 16, 2023 (See Note 16).

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At BPLP’s option, the 2022 Unsecured Term Loan bore interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate was unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the 2022 Unsecured Term Loan (See Note 3). As of December 31, 2022, the 2022 Unsecured Term Loan bore interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s credit rating at December 31, 2022. At December 31, 2022, BPLP had $730.0 million outstanding under the 2022 Unsecured Term Loan (see Note 16).

2021 Credit Facility and 2022 Unsecured Term Loan Compliance

The 2021 Credit Facility and 2022 Unsecured Term Loan contain customary representations and warranties, affirmative and negative covenants and events of default provisions, including the failure to pay indebtedness, breaches of covenants and bankruptcy and other insolvency events, which could result in the acceleration of the obligation to repay, in the case of the 2021 Credit Facility, all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Facility and, in the case of the 2022 Unsecured Term Loan, any outstanding amount under the 2022 Unsecured Term Loan. Among other covenants, the 2021 Credit Facility and the 2022 Unsecured Term Loan require that BPLP maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments. At December 31, 2022, BPLP was in compliance with each of these financial and other covenant requirements.

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 

The Company had letter of credit and performance obligations related to lender and development requirements that total approximately $26.5 million at December 31, 2022.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. From time to time, under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, either the Company or its partners may be entitled to an additional promoted interest or payments.

From time to time, the Company (or ventures in which the Company has an ownership interest) has agreed, and may in the future agree, to (1) guarantee portions of the principal, interest and other amounts in connection with their borrowings, (2) provide customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) in connection with their borrowings and (3) provide guarantees to lenders, tenants and other third parties for the completion of development projects. The Company has agreements with its outside or joint venture partners whereby the partners agree to reimburse the joint venture for their share of any payments made under the guarantee. In some cases, the Company earns a fee from the applicable joint venture for providing the guarantee.

In connection with the refinancing of 767 Fifth Avenue’s (the General Motors Building) secured loan by the Company’s consolidated joint venture entity, 767 Venture, LLC, the Company guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of December 31, 2022, the maximum funding obligation under the guarantee was approximately $13.7 million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made

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under the guarantee. As of December 31, 2022, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the 7750 Wisconsin Avenue office property located in Bethesda, Maryland, the Company entered into agreements with affiliates of The Bernstein Companies (the Company’s partner in the 7750 Wisconsin Avenue joint venture) under which the Company could be required to act as a mezzanine and/or mortgage lender and finance the construction of the hotel property being developed by an affiliate of The Bernstein Companies adjacent to the office property.   An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from the Company under such agreements, and the Company provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest. The financing was recorded as Note Receivable, Net in the Company’s Consolidated Balance Sheets.

In connection with the redevelopment of the Company’s 325 Main Street property located in Cambridge, Massachusetts, the Company was required pursuant to the local zoning ordinance and urban renewal plan to commence construction of a residential building of at least 200,000 square feet with 25% of the project designated as income-restricted (with a minimum of 20% of the square footage devoted to home ownership units) prior to the occupancy of the 325 Main Street property. Each of the zoning ordinance and urban renewal plan was amended to decouple the residential requirement from the occupancy of the 325 Main Street property. 325 Main Street consisted of an approximately 115,000 net rentable square foot premier workplace that was demolished and redeveloped into an approximately 414,000 net rentable square foot premier workplace. While the amendment to the urban renewal plan is subject to completion of administrative processes, the City of Cambridge issued a temporary certificate of occupancy in the second quarter of 2022 (See Note 3).

Concentrations of Credit Risk 

Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Company’s properties are geographically diverse and tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on the Company. 

Insurance

The Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $1.35 billion of property insurance in excess of the $1.0 billion of coverage in the Company’s property insurance program for 601 Lexington Avenue, New York, New York, consisting of $750 million of property and Terrorism Coverage in excess of the Company’s property insurance program and $600 million of Terrorism Coverage only in excess of the $1.75 billion of coverage. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in the Company’s portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage provided by IXP is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $200 million, the coinsurance is 20% and the deductible is 20% of the premiums earned by the insurer for the year prior to a claim. If the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if TRIA is not extended after its expiration on December 31, 2027, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance.

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The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes. Specifically, the Company currently carries earthquake insurance which covers its San Francisco and Los Angeles regions with a $330 million per occurrence limit, and a $330 million annual aggregate limit, $30 million of which is provided by IXP, as a direct insurer. This insurance is subject to a deductible in the amount of 3% of the value of the affected property. In addition, the Company currently carries earthquake insurance which covers its Seattle region with a $110 million per occurrence limit, and a $110 million annual aggregate limit. This insurance is subject to a deductible in the amount of 2% of the value of the affected property. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Company’s ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance or change the structure of its earthquake insurance program on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s earthquake insurance coverage for its Greater San Francisco and Los Angeles properties and the Company’s NBCR Coverage. Insofar as the Company owns IXP, it is responsible for its liquidity and capital resources, and the accounts of IXP are part of the Company’s consolidated financial statements. In particular, if a loss occurs which is covered by the Company’s NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and its insurance policy is maintained after the payout by the Federal Government. If the Company experiences a loss and IXP is required to pay under its insurance policy, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, BPLP has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism, earthquakes and pandemics, in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes, pandemics or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company’s business and financial condition and results of operations.

Legal Matters 

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company. 

State and Local Tax Matters 

Because BXP is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Company’s results of operations. 

Environmental Matters 

It is the Company’s policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Company’s acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that the Company believes will have a

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material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Company’s properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, the Company (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Company’s ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses and contractual limitations, including time limits, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

Environmental investigations at some of the Company’s properties and certain properties owned by affiliates of the Company have identified groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time. 

Some of the Company’s properties and certain properties owned by the Company’s affiliates are located in urban, industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations, it is the Company’s practice to investigate the nature and extent of detected contamination, including potential issues associated with vapor intrusion concerns and/or potential contaminant migration to or from the subject property in ground water, assess potential liability risks and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its decision-making process with respect to the acquisition, deal structure and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. The Company has developed an office park on this property. Prior to and during redevelopment activities, the Company engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws.

The Company expects that resolution of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Company’s properties or that the Company will be indemnified, in full or at all or that the Company will have insurance coverage, in the event that such environmental liabilities arise.

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9. Noncontrolling Interests

Noncontrolling interests relate to the interests in BPLP not owned by BXP and interests in consolidated property partnerships not wholly-owned by the Company. As of December 31, 2022, the noncontrolling interests in BPLP consisted of 16,531,172 OP Units, 1,679,175 LTIP Units (including 464,036 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2019 (i.e., 2012 OPP and 2013 - 2019 MYLTIP awards)), 203,278 2020 MYLTIP Units, 350,989 2021 MYLTIP Units and 253,453 2022 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the years ended December 31, 2022 and 2021, 182,929 and 523,969 OP Units, respectively, were presented by the holders for redemption (including 78,249 and 148,442 OP Units, respectively, issued upon conversion of LTIP Units, 2012 OPP Units and MYLTIP Units) and were redeemed by BXP in exchange for an equal number of shares of Common Stock.

At December 31, 2022, BPLP had outstanding 203,278 2020 MYLTIP Units, 350,989 2021 MYLTIP Units and 253,453 2022 MYLTIP Units. Prior to the end of the respective three-year performance period for each plan, holders of MYLTIP Units are entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the three-year performance period for each plan has ended, (1) the number of MYLTIP Units, both vested and unvested, that MYLTIP award recipients have earned, if any, based on the establishment of a performance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit and (2) with respect to the 2021 MYLTIP and 2022 MYLTIP only, the Company will make a “catch-up” cash payment on the MYLTIP Units that are ultimately earned in an amount equal to the regular and special dividends, if any, declared during the performance period on Common Stock, less the distributions actually paid during the performance period on all of the awarded 2021 MYLTIP Units and 2022 MYLTIP Units.

On February 6, 2020, the measurement period for the Company’s 2017 MYLTIP awards ended and, based on BXP’s relative total stockholder return (“TSR”) performance, the final awards were determined to be 83.8% of target, or an aggregate of approximately $17.6 million (after giving effect to employee separations). As a result, an aggregate of 270,942 2017 MYLTIP Units that had been previously granted were automatically forfeited.

On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.

On December 14, 2021, BPLP issued approximately 866,503 OP Units as partial consideration for the acquisition of 360 Park Avenue South in New York, New York. The OP Units issued totaled approximately $99.7 million based on the average closing price per share of BXP’s common stock for the five trading days immediately preceding the closing date.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the year ended December 31, 2022:

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Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 30, 2022	January 30, 2023	$0.98	$0.098
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the year ended December 31, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2021	January 28, 2022	$0.98	$0.098
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2016 MYLTIP Units and, after the February 6, 2020 measurement date, the 2017 MYLTIP Units) and its distributions on the 2017 MYLTIP Units (prior to the February 6, 2020 measurement date) and 2018 - 2020 MYLTIP Units (after the February 4, 2020 issuance date of the 2020 MYLTIP Units) that occurred during the year ended December 31, 2020:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2020	January 28, 2021	$0.98	$0.098
September 30, 2020	October 30, 2020	$0.98	$0.098
June 30, 2020	July 31, 2020	$0.98	$0.098
March 31, 2020	April 30, 2020	$0.98	$0.098
December 31, 2019	January 30, 2020	$0.98	$0.098

A holder of an OP Unit may present the OP Unit to BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, BPLP must redeem the OP Unit for cash equal to the then value of a share of Common Stock of BXP. BXP may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (other than OP Units owned by BXP), and LTIP Units (including the 2012 OPP Units and 2013 - 2019 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at December 31, 2022 was approximately $1.3 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $67.58 per share on December 30, 2022.

Noncontrolling Interests—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $1.5 billion and $1.6 billion at December 31, 2022 and December 31, 2021, respectively, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

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10. Stockholders’ Equity / Partners’ Capital

BXP

As of December 31, 2022, BXP had 156,757,867 shares of Common Stock outstanding.

As of December 31, 2022, BXP owned 1,749,682 general partnership units and 155,008,185 limited partnership units in BPLP.

On May 22, 2020, BXP renewed its “at the market” (“ATM”) stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its Common Stock through sales agents over a three-year period. Under the ATM stock offering program, BXP may also engage in forward sale transactions with affiliates of certain sales agents for the sale of its Common Stock on a forward basis. This program replaced BXP’s prior $600.0 million ATM stock offering program that was scheduled to expire on June 2, 2020. BXP intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. No shares of Common Stock have been issued under this ATM stock offering program.

During the year ended December 31, 2022, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock. During the year ended December 31, 2021, BXP issued 247,920 shares of Common Stock upon the exercise of options to purchase Common Stock.

During the years ended December 31, 2022 and December 31, 2021, BXP issued 182,929 and 523,969 shares of Common Stock, respectively, in connection with the redemption of an equal number of redeemable OP Units from limited partners.

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2022, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
December 30, 2022	January 30, 2023	$0.98	$0.98
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98
September 30, 2020	October 30, 2020	$0.98	$0.98
June 30, 2020	July 31, 2020	$0.98	$0.98
March 31, 2020	April 30, 2020	$0.98	$0.98
December 31, 2019	January 30, 2020	$0.98	$0.98

Preferred Stock

At December 31, 2020, BXP had 80,000 shares (8,000,000 Depositary Shares each representing 1/100th of a share) outstanding of its 5.25% Series B Preferred Stock with a liquidation preference of $2,500.00 per share ($25.00 per Depositary Share). BXP paid cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500.00 liquidation preference per share. BXP did not have the right to redeem the Series B Preferred Stock prior to March 27, 2018, except in certain circumstances relating to the preservation of BXP’s REIT status. On and after March 27, 2018, BXP, at its option, could redeem the Series B Preferred Stock for a cash redemption price of $2,500.00 per share ($25.00 per Depositary Share), plus all accrued and unpaid dividends. The Series B Preferred Stock was not redeemable by the holders, had no maturity date and was not convertible into any other security of BXP or its affiliates.

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of its 5.25% Series B Cumulative Redeemable Preferred Stock, which constituted all of the outstanding Series B Preferred Stock, and the corresponding depositary shares, each representing 1/100th of a share of Series B Preferred Stock. The

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redemption price per share of Series B Preferred Stock was $2,500, plus all accrued and unpaid dividends to, but not including, the redemption date, totaling $2,516.41 per share. On March 31, 2021, the Company transferred the full redemption price for all outstanding shares of Series B Preferred Stock of approximately $201.3 million, including approximately $1.3 million of accrued and unpaid dividends to, but not including, the redemption date, to the redemption agent. The excess of the redemption price over the carrying value of the Series B Preferred Stock and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. Common Shareholders and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders on the Consolidated Income Statements.

On April 1, 2021, BXP redeemed all of the outstanding shares of Series B Preferred Stock and all of the outstanding Depositary Shares. In connection with the redemption of the Series B Preferred Stock, all of the Series B Preferred Units, which had terms and preferences generally mirroring those of the Series B Preferred Stock, were redeemed by BPLP.

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the years ended December 31, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125
November 4, 2020	November 16, 2020	$32.8125
August 3, 2020	August 17, 2020	$32.8125
May 1, 2020	May 15, 2020	$32.8125
February 4, 2020	February 18, 2020	$32.8125

11. Segment Information

The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to the Company’s share of Net Operating Income for the years ended December 31, 2022, 2021 and 2020.

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BXP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	$	496,223	$	862,227
Add:
Preferred stock redemption charge	—		6,412		—
Preferred dividends	—		2,560		10,500
Noncontrolling interest—common units of the Operating Partnership	96,780		55,931		97,704
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	749,775		717,336		683,751
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	437,019		123,660		618,982
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

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BPLP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Add:
Preferred unit redemption charge	—		6,412		—
Preferred distributions	—		2,560		10,500
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	742,293		709,035		676,666
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	441,075		125,198		631,945
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred stock/unit redemption charge, preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, losses from early extinguishment of debt, unrealized loss on non-real estate investment, net operating income from unconsolidated joint ventures, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales-type lease, gains on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue. The Company believes NOI is useful to investors as a performance measure and believes it provides useful information to investors regarding its results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the

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financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, may distort operating performance measures at the property level. NOI presented by the Company may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.

The Company’s internal reporting utilizes its share of NOI, which includes its share of NOI from consolidated and unconsolidated joint ventures, which is a non-GAAP financial measure that is calculated as the consolidated amount, plus the Company’s share of the amount from the Company’s unconsolidated joint ventures (calculated based upon the Company’s economic percentage ownership interest and, in some cases, after priority allocations), less the Company’s partners’ share of the amount from the Company’s consolidated joint ventures (calculated based upon the partners’ economic percentage ownership interests and, in some cases, after priority allocations, income allocation to private REIT shareholders and their share of fees due to the Company). The Company’s share of NOI from unconsolidated joint ventures does not include its share of losses from early extinguishment of debt from unconsolidated joint ventures, gains on sales of real estate from unconsolidated joint ventures and gain on sale of investment from unconsolidated joint ventures, both of which are included within Income (Loss) From Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.  Management utilizes its share of NOI in assessing its performance as the Company has several significant joint ventures and, in some cases, the Company exercises significant influence over, but does not control, the joint venture, in which case GAAP requires that the Company account for the joint venture entity using the equity method of accounting and the Company does not consolidate it for financial reporting purposes. In other cases, GAAP requires that the Company consolidate the venture even though the Company’s partner(s) owns a significant percentage interest. As a result, the presentations of the Company’s share of NOI should not be considered a substitute for, and should only be considered together with and as a supplement to, the Company’s financial information presented in accordance with GAAP.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Preferred stock/unit redemption charge, preferred dividends/distributions, interest expense, losses from early extinguishment of debt, unrealized loss on non-real estate investment, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gain on sales-type lease, gains on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue are not included in NOI and are provided as reconciling items to the Company’s reconciliations of its share of NOI to net income attributable to common shareholders/unitholders.

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by geographic area. The Company’s segments by geographic area are Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. On September 1, 2021, the Company invested in a joint venture that acquired Safeco Plaza located in Seattle, Washington. As such, the Seattle region was identified as a segment during the third quarter of 2021. The Company also presents information for each segment by property type, including Premier Workplace (which includes office, life sciences and retail), Residential and Hotel.

Parking and other revenue for the year ended December 31, 2022 increased by approximately $25.4 million compared to 2021. These increases were primarily in transient and monthly parking revenue.

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Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	1,005,156		$	—		$	1,031,479		$	534,397		$	31,978		$	365,402		$	2,968,412
Residential	15,086			—			—			14,769			—			27,326			57,181
Hotel	39,482			—			—			—			—			—			39,482
Total	1,059,724			—			1,031,479			549,166			31,978			392,728			3,065,075
% of Grand Totals	34.58		%	—		%	33.65		%	17.92		%	1.04		%	12.81		%	100.00		%
Rental Expenses:
Premier Workplace	360,218			—			391,293			183,353			8,386			135,237			1,078,487
Residential	5,961			—			—			11,371			—			12,251			29,583
Hotel	27,478			—			—			—			—			—			27,478
Total	393,657			—			391,293			194,724			8,386			147,488			1,135,548
% of Grand Totals	34.66		%	—		%	34.46		%	17.15		%	0.74		%	12.99		%	100.00		%
Net operating income	$	666,067		$	—		$	640,186		$	354,442		$	23,592		$	245,240		$	1,929,527
% of Grand Totals	34.52		%	—		%	33.18		%	18.37		%	1.22		%	12.71		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(45,822)			—			(145,990)			—			—			—			(191,812)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	34,233			53,023			1,594			12,785			7,690			36,756			146,081
Company’s share of net operating income	$	654,478		$	53,023		$	495,790		$	367,227		$	31,282		$	281,996		$	1,883,796
% of Grand Totals	34.75		%	2.81		%	26.32		%	19.49		%	1.66		%	14.97		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the year ended December 31, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	930,560		$	—		$	1,012,172		$	508,620		$	—			$	340,808		$	2,792,160
Residential	13,397			—			—			3,892			—				25,379			42,668
Hotel	13,609			—			—			—			—				—			13,609
Total	957,566			—			1,012,172			512,512			—				366,187			2,848,437
% of Grand Totals	33.62		%	—		%	35.53		%	17.99		%	—		%		12.86		%	100.00		%
Rental Expenses:
Premier Workplace	322,298			—			379,267			168,040			—				127,102			996,707
Residential	5,811			—			—			6,717			—				11,916			24,444
Hotel	12,998			—			—			—			—				—			12,998
Total	341,107			—			379,267			174,757			—			—	139,018			1,034,149
% of Grand Totals	32.98		%	—		%	36.67		%	16.90		%	—		%		13.45		%	100.00		%
Net operating income	$	616,459		$	—		$	632,905		$	337,755		$	—			$	227,169		$	1,814,288
% of Grand Totals	33.98		%	—		%	34.88		%	18.62		%	—		%		12.52		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(43,232)			—			(143,072)			—			—				—			(186,304)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	16,551			51,641			(664)			14,152			2,498				23,578			107,756
Company’s share of net operating income	$	589,778		$	51,641		$	489,169		$	351,907		$	2,498			$	250,747		$	1,735,740
% of Grand Totals	33.98		%	2.98		%	28.18		%	20.27		%	0.14		%		14.45		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the year ended December 31, 2020:

	Boston			Los Angeles			New York			San Francisco			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	897,915		$	—		$	935,966		$	508,327		$	336,587		$	2,678,795
Residential	13,616			—			—			155			24,375			38,146
Hotel	7,478			—			—			—			—			7,478
Total	919,009			—			935,966			508,482			360,962			2,724,419
% of Grand Totals	33.73		%	—		%	34.36		%	18.66		%	13.25		%	100.00		%
Rental Expenses:
Premier Workplace	318,509			—			384,753			163,156			132,051			998,469
Residential	5,378			—			—			2,261			11,100			18,739
Hotel	13,136			—			—			—			—			13,136
Total	337,023			—			384,753			165,417			143,151			1,030,344
% of Grand Totals	32.71		%	—		%	37.35		%	16.05		%	13.89		%	100.00		%
Net operating income	$	581,986		$	—		$	551,213		$	343,065		$	217,811		$	1,694,075
% of Grand Totals	34.35		%	—		%	32.54		%	20.25		%	12.86		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(41,849)			—			(121,038)			—			—			(162,887)
Add: Company’s share of net operating income from unconsolidated joint ventures	10,765			57,907			(5,326)			14,928			16,669			94,943
Company’s share of net operating income	$	550,902		$	57,907		$	424,849		$	357,993		$	234,480		$	1,626,131
% of Grand Totals	33.88		%	3.56		%	26.12		%	22.02		%	14.42		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

12. Earnings Per Share / Common Unit

BXP

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. common shareholders and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. common shareholders by the weighted-average number of common shares outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of BXP using the two-class method. Participating securities are included in the computation of diluted EPS of BXP using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BXP excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of BPLP that are exchangeable for BXP’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

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	Year ended December 31, 2022
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	156,726	$	5.42
Allocation of undistributed earnings to participating securities	(891)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	848,056		156,726	5.41
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,056	157,137	$	5.40
	Year ended December 31, 2021
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,376	$	3.17
	Year ended December 31, 2020
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	862,227	155,432	$	5.55
Allocation of undistributed earnings to participating securities	(748)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,432	$	5.54
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,517	$	5.54

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BPLP

The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership common unitholders and the number of common units used in the computation of basic earnings per common unit, which is calculated by dividing net income attributable to Boston Properties Limited Partnership common unitholders by the weighted-average number of common units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic earnings per common unit using the two-class method. Participating securities are included in the computation of diluted earnings per common unit using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BPLP excludes such units from the diluted earnings per common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per common unit. Included in the number of units (the denominator) below are approximately 17,634,000, 17,034,000 and 17,211,000 redeemable common units for the years ended December 31, 2022, 2021 and 2020, respectively.

	Year ended December 31, 2022
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	174,360	$	5.49
Allocation of undistributed earnings to participating securities	(991)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,360	$	5.48
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,771	$	5.47
	Year ended December 31, 2021
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,410	$	3.24

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	Year ended December 31, 2020
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,979	172,643	$	5.68
Allocation of undistributed earnings to participating securities	(830)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,643	$	5.67
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,728	$	5.67

13. Employee Benefit Plans

Effective January 1, 1985, the predecessor of the Company adopted a 401(k) Savings Plan (the “Plan”) for its employees. Upon formation, the Company adopted the Plan and the terms of the Plan. 

Under the Plan, as amended, the Company’s matching contribution equals 200% of the first 3% of participant’s eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS ($305,000, $290,000 and $285,000 in 2022, 2021 and 2020, respectively), indexed for inflation) with no vesting requirement. The Company’s aggregate matching contribution for the years ended December 31, 2022, 2021 and 2020 was approximately $4.8 million, $4.7 million and $4.0 million, respectively. 

The Company also maintains a deferred compensation plan that is designed to allow officers of BXP to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2022 and 2021, the Company had maintained approximately $31.7 million and $42.7 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants. The Company’s liability as of December 31, 2022 and 2021 was approximately $31.7 million and $42.7 million, respectively, which are included in the accompanying Consolidated Balance Sheets.

14. Stock Option and Incentive Plan

At BXP’s 2021 annual meeting of stockholders held on May 20, 2021, its stockholders approved the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”). The 2021 Plan replaces the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”) and no further awards will be issued under the 2012 Plan. The material features of the 2021 Plan include, among other things: (i) the maximum number of shares of common stock reserved and available for issuance under the 2021 Plan is 5,400,000 shares less one share for every one share that was granted between March 4, 2021 and May 19, 2021 under the 2012 Plan, (ii) shares of common stock underlying awards granted under the 2021 Plan or the 2012 Plan that are forfeited, canceled or otherwise terminated (other than by exercise) will be added back to the shares of common stock available for issuance under the 2021 Plan and, with respect to “full-value” awards under the 2021 Plan or the 2012 Plan, shares tendered or held back for taxes and shares previously reserved for issuance pursuant to such an award to the extent that such shares are not issued and are no longer issuable pursuant to such an award (e.g., in the event that a full-value award that may be settled in cash or by issuance of shares of common stock is settled in cash) will be added back to the shares available for issuance under the 2021 Plan, (iii) the award of stock options (both incentive and non-qualified options), stock appreciation rights, restricted stock units, restricted stock, unrestricted stock, dividend equivalent rights, cash-based awards and other equity-based awards (including LTIP Units) is permitted, (iv) stock options may not be repriced and “underwater” stock options may not be exchanged for another award or cash

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without stockholder approval; and (v) the term of the 2021 Plan is for ten years from the date of stockholder approval.

On February 1, 2022, BXP’s Compensation Committee approved the 2022 MYLTIP awards under the 2021 Plan to certain officers and employees of BXP. The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric.

The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’s TSR equals the custom index TSR; for relative TSR performance between -1,000 basis points and +1,000 basis points, the number of LTIP Units earned will be determined using linear interpolation.

The second component represents the remaining one-half (50%) of the target grant-date value of the 2022 MYLTIP. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’s absolute TSR is greater than -4,000 basis points but less than +6,000 basis points, then the number of LTIP Units earned will be determined using linear interpolation.

Total earned awards under the 2022 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the first and second components and will range from zero to a maximum of 254,061 LTIP Units with a target of approximately 127,031 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on January 31, 2025, but may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. Vesting will be accelerated in the event of a change in control, termination of employment by BXP without cause, or termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control. The 2022 MYLTIP awards are in the form of LTIP Units issued on the grant date, and they are subject to forfeiture to the extent awards are not earned. Prior to the performance measurement date holders of the 2022 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units. Following the completion of the three-year performance period, the Company will also make a “catch-up” cash payment on the 2022 MYLTIP Units that are ultimately earned in an amount equal to the regular and special distributions, if any, declared during the performance period on BXP’s Common Stock, less the distributions actually paid to holders of 2022 MYLTIP Units during the performance period on all of the awarded 2022 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2022 MYLTIP awards have an aggregate value of approximately $17.3 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.

On February 6, 2020, the measurement period for the Company’s 2017 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 83.8% of target, or an aggregate of approximately $17.6 million (after giving effect to employee separations). As a result, an aggregate of 270,942 2017 MYLTIP Units that had been previously granted were automatically forfeited.

BXP issued 41,818, 57,383 and 29,630 shares of restricted common stock and BPLP issued 280,616, 281,640 and 207,181 LTIP Units to employees and non-employee directors under the 2012 Plan and the 2021 Plan during the years ended December 31, 2022, 2021 and 2020, respectively. BXP did not issue any non-qualified stock options under the 2012 Plan or 2021 Plan during the years ended December 31, 2022, 2021 and 2020. BPLP issued 254,061 2022 MYLTIP Units, 352,021 2021 MYLTIP Units and 203,278 2020 MYLTIP Units to employees

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under the 2012 Plan and 2021 Plan during the years ended December 31, 2022, 2021 and 2020, respectively. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and MYLTIP Unit. When issued, LTIP Units are not economically equivalent in value to a share of Common Stock, but over time can increase in value to one-for-one parity with Common Stock if there is sufficient appreciation in the value of the Company’s assets. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets of BXP and BPLP. A majority of the grants of restricted common stock and LTIP Units to employees vest in four equal annual installments. Restricted common stock is measured at fair value on the date of grant based on the number of shares granted and the closing price of BXP’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. Because the 2012 OPP Units and 2013 - 2022 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. The Company recognizes forfeitures as they occur on its awards of stock-based compensation. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in BXP’s Consolidated Balance Sheets and Partners’ Capital in BPLP’s Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, LTIP Units and 2017 - 2022 MYLTIP Units was approximately $50.7 million, $49.7 million and $43.0 million for the years ended December 31, 2022, 2021 and 2020, respectively. At December 31, 2022, there was (1) an aggregate of approximately $20.6 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and (2) an aggregate of approximately $4.9 million of unrecognized compensation expense related to unvested 2020 - 2022 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 1.9 years.

The shares of restricted stock were valued at approximately $4.7 million ($111.47 per share weighted-average), $5.8 million ($100.60 per share weighted-average) and $4.0 million ($133.81 per share weighted-average) for the years ended December 31, 2022, 2021 and 2020, respectively. 

LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718. LTIP Units issued during the years ended December 31, 2022, 2021 and 2020 were valued at approximately $28.9 million, $23.8 million and $26.3 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2022, 2021 and 2020 was $103.06, $84.43 and $127.14, respectively. The per unit fair value of each LTIP Unit granted in 2022, 2021 and 2020 was estimated on the date of grant using the following assumptions; an expected life of 5.7 years, 5.7 years and 5.7 years, a risk-free interest rate of 1.71%, 0.65% and 1.47% and an expected price volatility of 31.0%, 30.0% and 18.0%, respectively. 

There were no non-qualified stock options granted during the years ended December 31, 2022, 2021 and 2020.

A summary of the status of BXP’s stock options as of December 31, 2022, 2021 and 2020 and changes during the years then ended are presented below:

	Shares	Weighted-Average Exercise Price
Outstanding at December 31, 2019	395,353	$	96.37
Exercised	(43,792)	$	91.60
Outstanding at December 31, 2020	351,561	$	96.97
Exercised	(247,920)	$	96.95
Outstanding at December 31, 2021	103,641	$	97.01
Exercised	—	$	—
Outstanding at December 31, 2022	103,641	$	97.01

176

The following table summarizes information about BXP’s stock options outstanding at December 31, 2022: 

Options Outstanding				Options Exercisable
Number Outstanding at 12/31/22	Weighted-Average Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/22	Exercise Price
54,282	0.3 years	$	95.69	54,282	$	95.69
49,359	0.1 years	$	98.46	49,359	$	98.46

There was no total intrinsic value for the outstanding and exercisable stock options as of December 31, 2022. In addition, BXP had 103,641 and 103,641 options exercisable and vested at a weighted-average exercise price of $97.01 and $97.01 at December 31, 2022 and 2021, respectively.

BXP adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the “Stock Purchase Plan”) to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of the Common Stock during the last ten business days of the purchase period. BXP issued 9,813, 9,846 and 7,195 shares with the weighted-average purchase price equal to $87.30 per share, $89.73 per share and $90.53 per share under the Stock Purchase Plan during the years ended December 31, 2022, 2021 and 2020, respectively.

15. Related Party Transactions  

A firm controlled by Mr. Raymond A. Ritchey’s brother was paid aggregate leasing commissions of approximately $914,000 during the year ended December 31, 2020 related to certain exclusive leasing arrangements for certain Northern Virginia properties. There were no payments made for the years ended December 31, 2022 and 2021. In addition, Mr. Ritchey’s brother is employed by a real estate brokerage firm and participated in brokerage activities for which the Company paid the firm approximately $1.6 million, $1.9 million and $3.4 million for the years ended December 31, 2022, 2021 and 2020, respectively. Mr. Ritchey is a Senior Executive Vice President of BXP.

On July 13, 2018, the Company entered into a joint venture with a third party to acquire a development site at 3 Hudson Boulevard that, upon the future acquisition of additional available development rights, can accommodate an office tower with up to 2.0 million net rentable square feet located on the entire square block between 11th Avenue and Hudson Boulevard Park from West 34th Street to West 35th Street in New York City. The Company owns a 25% interest in, and is the managing member of, the joint venture. The Company provided $80.0 million of mortgage financing to the joint venture that bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions. The loan has been reflected as a Related Party Note Receivable, Net on the Company’s Consolidated Balance Sheets. The Company has recognized interest income of approximately $5.6 million, $3.6 million and $2.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. The Company's policy is to record notes receivable at their unamortized cost, net of any unamortized deferred fees or costs, premiums or discounts and an allowance for loan losses. Loan fees and direct costs associated with loans originated by the Company are deferred and amortized over the term of the note as interest income.

In accordance with the 2021 Plan, and as approved by its Board of Directors, seven non-employee directors made elections to receive deferred stock units in lieu of cash fees for 2022. As a result of these elections, the aggregate cash fees otherwise payable to a non-employee director during a fiscal quarter are converted into a number of deferred stock units equal to the aggregate cash fees divided by the last reported sales price of a share of BXP’s Common Stock on the last trading of the applicable fiscal quarter. The deferred stock units are also credited with dividend equivalents as dividends are paid by BXP. The deferred stock units may be settled in shares of Common Stock upon the cessation of such director’s service on the Board of Directors of BXP. The non-employee director compensation program provides, subject to certain conditions, the non-employee directors holding deferred stock units with the ability to elect, following cessation of their service on BXP’s Board of Directors, to diversify their investment elections into non-employer securities on a pre-tax basis and receive tax-deferred returns on such deferrals, which will ultimately be settled in cash. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the non-employee director in the future. At

177

December 31, 2022 and 2021, the Company had maintained approximately $0.6 million and $0.9 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the non-employee director and earnings on the deferred compensation pursuant to investments elected by the non-employee director. The Company’s liability as of December 31, 2022 and 2021 was approximately $0.6 million and $0.9 million, respectively, which is included in the accompanying Consolidated Balance Sheets. The terms of the non-employee director compensation program require the classification of these deferred stock units as temporary equity on the Consolidated Balance Sheets of Boston Properties, Inc. and Boston Properties Limited Partnership within Redeemable Deferred Stock Units. On December 16, 2021, in connection with the resignation of a director’s service on the Board of Directors of BXP, BXP issued 498 shares of Common Stock in settlement of the director’s outstanding deferred stock units. At December 31, 2022 and 2021, BXP had outstanding 97,853 and 83,073 deferred stock units, respectively.

16. Subsequent Events

On January 4, 2023, BPLP entered into the 2023 Unsecured Term Loan, which provided for a single borrowing of up to $1.2 billion. Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions. Upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the 2022 Unsecured Term Loan, which was scheduled to mature on May 16, 2023 (see Note 7).

At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 1/2 of 1%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. Based on BPLP’s credit rating upon entry into the credit agreement, the base rate margin is 0 basis points and the Term SOFR margin is 0.85%. The 2023 Unsecured Term Loan currently bears interest at a rate equal to adjusted Term SOFR plus 0.85%.

On January 5, 2023, the Company commenced the development of 290 Binney Street, an approximately 566,000 net rentable square feet laboratory/life sciences project in Cambridge, Massachusetts. Concurrent with the commencement of this project, the Company began demolition of the existing Kendall Center Blue Parking Garage to support the development of this project. 290 Binney Street is 100% pre-leased to AstraZeneca (See Note 3).

On January 30, 2023, the Company commenced the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts. 300 Binney Street consisted of an approximately 195,000 net rentable square foot premier workplace that is being redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space. The project is 100% pre-leased to a life sciences organization.

On January 31, 2023, the Company acquired a 50% interest in a joint venture that owns 13100 and 13150 Worldgate Drive located in Herndon, Virginia for a gross purchase price of approximately $17.0 million. The acquisition was completed with available cash. 13100 and 13150 Worldgate Drive consists of two vacant office buildings aggregating approximately 350,000 rentable square feet and a 1,200-space structured parking deck situated on a 10-acre site. The joint venture intends to redevelop the property for residential use. There can be no assurance that the joint venture will commence the development on the terms currently contemplated or at all.

On January 25, 2023, BXP’s Compensation Committee approved the 2023 Multi-Year Long-Term Incentive Program (the “2023 MYLTIP”) awards under the 2021 Plan to certain executive officers of BXP. Earned awards will range from zero to a maximum of 322,053 LTIP Units depending on BXP’s relative and absolute TSR performance, with a target of approximately 161,026 LTIP Units. Under ASC 718, the 2023 MYLTIP awards have an aggregate value of approximately $13.1 million.

On February 3, 2023 and February 7, 2023, BXP issued an aggregate of 64,731 shares of restricted common stock and BPLP issued an aggregate of 401,543 LTIP Units under the 2021 Plan to certain employees of BXP.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP.’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of

178

approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 MYLTIP Units that had been previously granted were automatically forfeited.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosures.

None.

Item 9A. Controls and Procedures.

Boston Properties, Inc.

As of the end of the period covered by this report, an evaluation was carried out by our management, with the participation of Boston Properties, Inc.’s Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer), of the effectiveness of its disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation, Boston Properties, Inc.’s Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures were effective as of the end of the period covered by this report. In addition, no change in Boston Properties, Inc.’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred during the fourth quarter of Boston Properties, Inc.’s fiscal year ended December 31, 2022 that has materially affected, or is reasonably likely to materially affect, Boston Properties, Inc.’s internal control over financial reporting. 

Management’s Report on Internal Control over Financial Reporting is set forth on page 106 of this Annual Report on Form 10-K and is incorporated herein by reference.

Boston Properties Limited Partnership

As of the end of the period covered by this report, an evaluation was carried out by the management of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership, with the participation of its Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer), of the effectiveness of its disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer of Boston Properties, Inc. concluded that these disclosure controls and procedures were effective as of the end of the period covered by this report. In addition, no change in its internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred during the fourth quarter of its fiscal year ended December 31, 2022 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

Management’s Report on Internal Control over Financial Reporting is set forth on page 119 of this Annual Report on Form 10-K and is incorporated herein by reference.

Item 9B. Other Information.

None.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.

Not Applicable.

179

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

The information required by Item 10 will be included in the Proxy Statement to be filed relating to Boston Properties, Inc.’s 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 11. Executive Compensation.

The information required by Item 11 will be included in the Proxy Statement to be filed relating to Boston Properties, Inc.’s 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The following table summarizes Boston Properties, Inc.’s equity compensation plans as of December 31, 2022.

Equity Compensation Plan Information

Plan category	Number of securities to be issued upon exercise of outstanding options, warrants and rights (a)		Weighted-average exercise price of outstanding options, warrants and rights (b)		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c)
Equity compensation plans approved by security holders(1)	4,162,889	(2)	$97.01	(2)	4,941,415	(3)
Equity compensation plans not approved by security holders(4)	N/A		N/A		58,492
Total	4,162,889		$97.01		4,999,907

______________

(1)Includes information related to BXP’s 1997 Plan, 2012 Plan and 2021 Plan.

(2)Includes (a) 103,641 shares of common stock issuable upon the exercise of outstanding options (all of which are vested and exercisable), (b) 1,679,175 long term incentive units (LTIP units) (1,114,705 of which are vested) that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (c) 1,474,500 common units issued upon conversion of LTIP units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (d) 203,278 2020 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (e) 350,989 2021 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock, (f) 253,453 2022 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to BPLP for redemption and acquired by BXP for shares of its common stock and (g) 97,853 deferred stock units which were granted pursuant to elections by certain of BXP’s non-employee directors to defer all cash compensation to be paid to such directors and to receive their deferred cash compensation in shares of BXP’s common stock upon their retirement from its Board of Directors.

Does not include 74,548 shares of restricted stock, as they have been reflected in BXP’s total shares outstanding. Because there is no exercise price associated with LTIP units, common units, 2020 MYLTIP Awards, 2021 MYLTIP Awards, 2022 MYLTIP Awards or deferred stock units, such shares are not included in the weighed-average exercise price calculation.

(3)Represents awards available for issuance under BXP’s 2021 Plan.

(4)Includes information related to the 1999 Non-Qualified Employee Stock Purchase Plan (ESPP). The ESPP was adopted by the Board of Directors of BXP on October 29, 1998. The ESPP has not been approved by BXP’s stockholders. The ESPP is available to all our employees that are employed on the first day of the purchase period. Under the ESPP, each eligible employee may purchase shares of our common stock at semi-annual intervals each year at a purchase price equal to 85% of the average closing prices of our common stock on the New York Stock Exchange during the last ten business days of the purchase period. Each eligible employee may contribute no more than $25,000 per year to purchase our common stock under the ESPP.

180

Additional information concerning security ownership of certain beneficial owners and management required by Item 12 will be included in the Proxy Statement to be filed relating to Boston Properties, Inc.’s 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information required by Item 13 will be included in the Proxy Statement to be filed relating to Boston Properties, Inc.’s 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services.

The information required by Item 14 will be included in the Proxy Statement to be filed relating to Boston Properties, Inc.’s 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

181

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a) Financial Statement Schedule 

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances		Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
					Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,284,510	$	1,796,252	$	1,532,654	$	325,762	$	1,796,252	$	1,858,416	$	—	$	—	$	3,654,668	$	457,344	1968/2019	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		718,028		115,639		1,510,834		231		131,758		1,758,462		721,498		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		499,451		195,986		1,330,572		—		—		1,526,558		736,748		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		393,821		354,107		1,079,272		—		—		1,433,379		445,239		1961/2018	2002	(1)
601 Lexington Avenue	Office	New York, NY	987,858		241,600		494,782		515,644		289,639		962,387		—		—		1,252,026		348,892		1977/1997/2021	2001	(1)
Salesforce Tower	Office	San Francisco, CA	—		200,349		946,205		7,462		200,349		953,667		—		—		1,154,016		129,281		2018	2013	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		235,129		250,512		872,044		—		—		1,122,556		310,318		1976	2010	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		51,800		285,263		654,967		—		—		940,230		179,143		2014	2007	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		119,341		131,067		555,295		—		—		686,362		157,368		1971-1975/2017	2012	(1)
Madison Centre	Office	Seattle, WA	—		104,641		564,336		2,879		104,641		567,215		—		—		671,856		13,611		2017	2022	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		121,437		169,193		498,095		—		—		667,288		241,474		2004	2000	(1)
Carnegie Center	Office	Princeton, NJ	—		142,666		316,856		168,261		94,243		476,990		55,919		631		627,783		252,390		1983-2016	1998/1999/2000/2007/2014/2017/2019	(1)
125 Broadway	Office	Cambridge, MA	—		126,364		433,662		58		126,364		433,720		—		—		560,084		4,503		2000	2022	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		24,158		63,988		478,695		—		—		542,683		171,876		2011	2007	(1)
Reston Next	Office	Reston, VA	—		2,901		525,277		—		2,901		525,277		—		—		528,178		15,293		2022	1998	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		245,609		87,852		339,304		—		—		427,156		182,121		1986	1997	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		39,288		56,853		345,586		—		—		402,439		104,864		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		31,682		103,000		285,347		—		—		388,347		95,520		2012	2010	(1)
325 Main Street	Office	Cambridge, MA	—		21,596		312,492		—		21,596		312,492		—		—		334,088		4,308		2022	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		8,026		72,545		227,792		—		—		300,337		72,414		2014	2012	(1)
145 Broadway	Office	Cambridge, MA	—		121		273,013		26,184		23,367		275,951		—		—		299,318		26,881		2019	1997	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		113,108		104,329		192,320		—		—		296,649		71,410		2011	2008	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		28,991		13,687		266,386		—		—		280,073		98,665		2008-2009	2003	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		87,804		18,789		231,828		4,427		—		255,044		105,172		1985-1989	2011	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,852		40,934		152,229		—		—		193,163		42,776		2015	2013	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		21,270		95,066		89,643		—		—		184,709		28,575		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		55,359		20,108		156,915		1,065		—		178,088		85,394		1955/1987/2017	1997/1998	(1)

182

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances	Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
				Land	Building
1330 Connecticut Avenue	Office	Washington, DC	—	25,982	82,311	38,047	27,135	119,205	—	—	146,340	48,273	1984/2018	2004	(1)
One Freedom Square	Office	Reston, VA	—	9,929	84,504	51,743	11,293	134,883	—	—	146,176	66,084	2000	2003	(1)
880 Winter Street	Office	Waltham, MA	—	15,597	37,255	91,537	15,597	128,792	—	—	144,389	2,560	1998/2022	2019	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—	18,021	109,038	3,822	18,062	112,819	—	—	130,881	52,543	2003-2006	2007	(1)
140 Kendrick Street	Office	Needham, MA	—	18,095	66,905	42,528	19,092	102,625	—	5,811	127,528	41,627	2000	2004	(1)
Shady Grove Innovation District	Office	Rockville, MD	—	52,030	64,212	7,219	26,834	34,988	61,639	—	123,461	3,319	1968-1985	2021	(1)
One and Two Reston Overlook	Office	Reston, VA	—	16,456	66,192	40,516	16,179	106,985	—	—	123,164	57,631	1999	2000	(1)
Weston Corporate Center	Office	Weston, MA	—	25,753	92,312	968	25,854	93,179	—	—	119,033	38,385	2010	2001	(1)
17Fifty Presidents Street	Office	Reston, VA	—	—	113,362	162	—	113,524	—	—	113,524	12,232	2020	2013	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	21,618	12,533	92,065	—	—	104,598	54,116	2001	2003	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	25,418	21,173	76,454	—	—	97,627	34,399	1981/1996/2013	2006	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	6,406	2,290	91,821	—	—	94,111	20,616	2016	1997	(1)
Two Freedom Square	Office	Reston, VA	—	13,930	77,739	317	15,420	76,566	—	—	91,986	35,850	2001	2003	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	49,264	16,813	73,265	317	—	90,395	23,428	1999/2021	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	18,876	20,785	69,273	—	—	90,058	29,294	1983/1998/2013	2006	(1)
153 & 211 Second Avenue	Office	Waltham, MA	—	33,233	55,940	202	33,233	55,940	202	—	89,375	4,808	1964-2006	2021	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	24,604	13,807	73,809	—	—	87,616	38,306	1992	2005	(1)
20 CityPoint	Office	Waltham, MA	—	4,887	72,764	7,072	4,887	79,836	—	—	84,723	9,606	2020	2007	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	12,859	11,097	72,841	—	—	83,938	42,839	2003	1999	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	9,701	14,023	69,908	—	—	83,931	32,578	2008	2001	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	49,302	28,205	50,466	—	—	78,671	31,436	1985	1999	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	6,391	16,741	57,676	—	—	74,417	19,375	1987/2003	2011	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	1,268	18,080	51,402	1,128	—	70,610	18,995	2013	2009	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	5,579	10,148	55,423	—	—	65,571	33,822	1984	1998	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	11,204	—	64,553	—	—	64,553	26,659	2009	2004	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	33,597	548	58,293	—	—	58,841	42,204	1987	1997	(1)
University Place	Office	Cambridge, MA	—	—	37,091	15,903	5,425	47,569	—	—	52,994	35,296	1985	1998	(1)
890 Winter Street	Office	Waltham, MA	—	13,913	28,557	6,998	13,913	35,555	—	—	49,468	5,409	1999	2019	(1)
Capital Gallery	Office	Washington, DC	—	4,725	29,565	9,544	8,662	35,172	—	—	43,834	22,415	1981/2006	2007	(1)
North First Business Park	Office	San Jose, CA	—	23,398	13,069	5,288	23,378	18,377	—	—	41,755	17,270	1981	2007	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	15,726	1,323	40,295	—	—	41,618	16,841	1999	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	12,718	2,390	24,570	—	—	26,960	15,578	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	19,842	1,263	19,551	1,452	—	22,266	16,716	1982	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	546	6,492	10,489	—	—	16,981	2,308	2015	2007	(1)
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,877	3,219	12,915	—	—	16,134	3,838	2015	2012	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	11,501	425	14,576	—	—	15,001	7,929	1979	1997	(1)

183

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances			Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements			Building and Improvements			Land Held for Development			Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
						Land		Building
Avant Retail	Office	Reston, VA	—			1,499		6,647		2,577		1,499			9,224			—			—		10,723		3,210		2014	2010	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—			594		6,748		2,297		778			8,861			—			—		9,639		7,507		1985	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—			168		1,943		6,944		314			8,741			—			—		9,055		3,103		1968/1979/1987	1997	(1)
250 Binney Street	Office	Cambridge, MA	—			110		4,483		3,593		273			7,913			—			—		8,186		6,974		1983	1997	(1)
453 Ravendale Drive	Office	Mountain View, CA	—			5,477		1,090		677		5,477			1,767			—			—		7,244		964		1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—			26		150		6,064		65			6,175			—			—		6,240		3,530		1968	1997	(1)
The Skylyne	Residential	Oakland, CA	—			28,962		239,077		1,784		28,962			240,861			—			—		269,823		14,154		2020	N/A	(1)
Signature at Reston	Residential	Reston, VA	—			27,076		190,580		1,667		27,076			192,247			—			—		219,323		23,353		2018	2013	(1)
Proto Kendall Square	Residential	Cambridge, MA	—			9,243		127,248		3,336		9,245			130,582			—			—		139,827		14,508		2018	2015	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—			3,529		54,891		2,356		3,529			57,247			—			—		60,776		17,174		2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—			478		37,918		32,837		1,201			69,521			511			—		71,233		51,568		1986/2017	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—			—		35,035		6,798		103			41,730			—			—		41,833		17,039		1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—			1,256		15,697		1,653		1,434			17,172			—			—		18,606		7,395		2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—			1,163		11,633		2,111		1,579			13,328			—			—		14,907		13,075		1990	1997	(1)
2100 Pennsylvania Avenue	Development	Washington, DC	—			—		—		472,873		185,203			230,497			—			57,173		472,873		9,755		N/A	N/A	N/A
190 CityPoint (formerly 180 CityPoint)	Development	Waltham, MA	—			—		—		140,370		—			—			—			140,370		140,370		—		N/A	2006	N/A
103 CityPoint	Development	Waltham, MA	—			—		—		44,752		—			—			74			44,678		44,752		—		N/A	2007	N/A
Reston Next Office Phase II	Development	Reston, VA	—			—		—		22,954		—			—			—			22,954		22,954		—		N/A	1998	N/A
Reston Next Retail	Development	Reston, VA	—			—		—		3,199		—			—			—			3,199		3,199		—		N/A	1998	N/A
777 Harrison Street	Land	San Francisco, CA	—			144,647		—		28,239		—			47			172,839			—		172,886		20		N/A	2020	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—			—		—		148,476		—			—			148,476			—		148,476		—		N/A	1997	N/A
Back Bay Station Master Plan	Land	Boston, MA	—			—		—		72,957		—			—			72,957			—		72,957		—		N/A	N/A	N/A
3625-3635 Peterson Way	Land	Santa Clara, CA	—			63,206		—		5,165		—			—			68,371			—		68,371		—		N/A	2016	N/A
North First Master Plan	Land	San Jose, CA	—			35,004		—		3,968		—			—			38,972			—		38,972		—		N/A	2007	N/A
Plaza at Almaden	Land	San Jose, CA	—			—		—		38,090		—			—			38,090			—		38,090		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—			—		—		19,891		—			—			19,891			—		19,891		—		N/A	2007	N/A
CityPoint South Master Plan	Land	Waltham, MA	—			—		—		19,693		—			—			19,693			—		19,693		—		N/A	N/A	N/A
Reston Gateway Master Plan	Land	Reston, VA	—			—		—		12,734		—			—			12,734			—		12,734		—		N/A	1998	N/A
Weston Quarry	Land	Weston, MA	—			—		—		1,249		—			—			1,249			—		1,249		—		N/A	2001	N/A
Broad Run Business Park	Land	Loudoun County, VA	—			—		—		1,184		—			—			1,184			—		1,184		—		N/A	1998	N/A
Reston Overlook Master Plan	Land	Reston, VA	—			—		—		80		—			—			80			—		80		—		N/A	2000	N/A
			$	3,272,368	(2)	$	5,373,987	$	14,755,092	$	5,615,135	$	5,571,327	(3)	$	19,044,812	(4)	$	721,501	(5)	$	406,574	$	25,744,214	$	6,260,992

184

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $50,310. Accumulated Depreciation does not include approximately $37,090 of accumulated depreciation related to Furniture, Fixtures and Equipment. Office type includes office, life sciences, and retail properties.

The aggregate cost and accumulated depreciation for tax purposes was approximately $23.1 billion and $5.0 billion, respectively.

(1)Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2)Includes unamortized deferred financing costs totaling approximately $27,632.

(3)Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

(4)Includes Right of Use Assets - Finance Leases of approximately $23,345.

(5)Includes pre-development costs.

185

Boston Properties, Inc.

Real Estate and Accumulated Depreciation

December 31, 2022, 2021 and 2020

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2022		2021		2020
Real Estate:
Balance at the beginning of the year	$	24,108,220	$	23,303,303	$	22,844,697
Additions to/improvements of real estate	2,228,000		1,145,084		996,989
Assets sold/written-off	(592,006)		(340,167)		(538,383)
Balance at the end of the year	$	25,744,214	$	24,108,220	$	23,303,303
Accumulated Depreciation:
Balance at the beginning of the year	$	5,848,183	$	5,501,637	$	5,239,179
Depreciation expense	646,020		623,854		573,898
Assets sold/written-off	(233,211)		(277,308)		(311,440)
Balance at the end of the year	$	6,260,992	$	5,848,183	$	5,501,637

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

186

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
					Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances		Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,284,510	$	1,796,252	$	1,532,654	$	325,762	$	1,796,252	$	1,858,416	$	—	$	—	$	3,654,668	$	457,344	1968/2019	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		658,972		100,541		1,466,876		231		131,758		1,699,406		702,725		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		437,070		180,419		1,283,758		—		—		1,464,177		716,657		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		334,213		339,200		1,034,571		—		—		1,373,771		426,148		1961/2018	2002	(1)
601 Lexington Avenue	Office	New York, NY	987,858		241,600		494,782		478,558		279,281		935,659		—		—		1,214,940		337,421		1977/1997/2021	2001	(1)
Salesforce Tower	Office	San Francisco, CA	—		200,349		946,205		7,462		200,349		953,667		—		—		1,154,016		129,281		2018	2013	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		235,129		250,512		872,044		—		—		1,122,556		310,318		1976	2010	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		51,800		285,263		654,967		—		—		940,230		179,143		2014	2007	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		119,341		131,067		555,295		—		—		686,362		157,368		1971-1975/2017	2012	(1)
Madison Centre	Office	Seattle, WA	—		104,641		564,336		2,879		104,641		567,215						671,856		13,611		2017	2022	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		83,458		159,694		469,615		—		—		629,309		229,310		2004	2000	(1)
Carnegie Center	Office	Princeton, NJ	—		142,666		316,856		153,298		90,501		465,769		55,919		631		612,820		247,525		1983-2016	1998/1999/2000/2007/2014/2017/2019	(1)
125 Broadway	Office	Cambridge, MA	—		126,364		433,662		58		126,364		433,720		—		—		560,084		4,503		2000	2022	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		24,158		63,988		478,695		—		—		542,683		171,876		2011	2007	(1)
Reston Next	Office	Reston, VA	—		2,901		525,277		—		2,901		525,277		—		—		528,178		15,293		2022	1998	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		218,367		81,040		318,874		—		—		399,914		173,396		1986	1997	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		39,288		56,853		345,586		—		—		402,439		104,864		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		31,682		103,000		285,347		—		—		388,347		95,520		2012	2010	(1)
325 Main Street	Office	Cambridge, MA	—		21,596		312,492		(193)		21,403		312,492		—		—		333,895		4,308		2022	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		8,026		72,545		227,792		—		—		300,337		72,414		2014	2012	(1)
145 Broadway	Office	Cambridge, MA	—		121		273,013		25,981		23,164		275,951		—		—		299,115		26,881		2019	1997	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		113,108		104,329		192,320		—		—		296,649		71,410		2011	2008	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		28,655		13,603		266,134		—		—		279,737		98,574		2008-2009	2003	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		87,804		18,789		231,828		4,427		—		255,044		105,172		1985-1989	2011	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,852		40,934		152,229		—		—		193,163		42,776		2015	2013	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		21,270		95,066		89,643		—		—		184,709		28,575		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		51,284		19,089		153,859		1,065		—		174,013		84,089		1955/1987/2017	1997/1998	(1)
1330 Connecticut Avenue	Office	Washington, DC	—		25,982		82,311		33,434		25,982		115,745		—		—		141,727		46,795		1984/2018	2004	(1)
One Freedom Square	Office	Reston, VA	—		9,929		84,504		46,106		9,883		130,656		—		—		140,539		64,278		2000	2003	(1)
880 Winter Street	Office	Waltham, MA	—		15,597		37,255		91,537		15,597		128,792		—		—		144,389		2,560		1998/2022	2019	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—		18,021		109,038		3,658		18,021		112,696		—		—		130,717		52,498		2003-2006	2007	(1)
140 Kendrick Street	Office	Needham, MA	—		18,095		66,905		38,538		18,095		99,632		—		5,811		123,538		40,368		2000	2004	(1)

187

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
				Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances	Land	Building
Shady Grove Innovation District	Office	Rockville, MD	—	52,030	64,212	7,219	26,834	34,988	61,639	—	123,461	3,319	1968-1985	2021	(1)
One and Two Reston Overlook	Office	Reston, VA	—	16,456	66,192	36,098	15,074	103,672	—	—	118,746	56,216	1999	2000	(1)
Weston Corporate Center	Office	Weston, MA	—	25,753	92,312	968	25,854	93,179	—	—	119,033	38,385	2010	2001	(1)
17Fifty Presidents Street	Office	Reston, VA	—	—	113,362	162	—	113,524	—	—	113,524	12,232	2020	2013	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	16,073	11,146	87,907	—	—	99,053	52,341	2001	2003	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	25,120	21,098	76,231	—	—	97,329	34,306	1981/1996/2013	2006	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	6,243	2,127	91,821	—	—	93,948	20,616	2016	1997	(1)
Two Freedom Square	Office	Reston, VA	—	13,930	77,739	(5,895)	13,866	71,908	—	—	85,774	33,860	2001	2003	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	46,603	16,148	71,269	317	—	87,734	22,576	1999/2021	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	18,697	20,741	69,138	—	—	89,879	29,243	1983/1998/2013	2006	(1)
153 & 211 Second Avenue	Office	Waltham, MA	—	33,233	55,940	202	33,233	55,940	202	—	89,375	4,808	1964-2006	2021	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	22,987	13,403	72,596	—	—	85,999	37,791	1992	2005	(1)
20 CityPoint	Office	Waltham, MA	—	4,887	72,764	7,072	4,887	79,836	—	—	84,723	9,606	2020	2007	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	9,872	10,350	70,601	—	—	80,951	41,883	2003	1999	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	9,596	13,997	69,829	—	—	83,826	32,548	2008	2001	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	47,222	27,685	48,906	—	—	76,591	30,773	1985	1999	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	6,391	16,741	57,676	—	—	74,417	19,375	1987/2003	2011	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	1,268	18,080	51,402	1,128	—	70,610	18,995	2013	2009	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	2,968	9,496	53,464	—	—	62,960	32,986	1984	1998	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	11,204	—	64,553	—	—	64,553	26,659	2009	2004	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	31,941	134	57,051	—	—	57,185	41,677	1987	1997	(1)
University Place	Office	Cambridge, MA	—	—	37,091	14,453	5,425	46,119	—	—	51,544	34,270	1985	1998	(1)
890 Winter Street	Office	Waltham, MA	—	13,913	28,557	6,998	13,913	35,555	—	—	49,468	5,409	1999	2019	(1)
Capital Gallery	Office	Washington, DC	—	4,725	29,565	4,882	6,128	33,044	—	—	39,172	21,506	1981/2006	2007	(1)
North First Business Park	Office	San Jose, CA	—	23,398	13,069	5,265	23,372	18,360	—	—	41,732	17,264	1981	2007	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	13,721	822	38,791	—	—	39,613	16,195	1999	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	10,611	1,862	22,991	—	—	24,853	14,898	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	19,078	1,072	18,978	1,452	—	21,502	16,474	1982	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	546	6,492	10,489	—	—	16,981	2,308	2015	2007	(1)
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,877	3,219	12,915	—	—	16,134	3,838	2015	2012	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	10,864	266	14,098	—	—	14,364	7,725	1979	1997	(1)
Avant Retail	Office	Reston, VA	—	1,499	6,647	2,577	1,499	9,224	—	—	10,723	3,210	2014	2010	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—	594	6,748	1,568	595	8,315	—	—	8,910	7,273	1985	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—	168	1,943	6,358	168	8,301	—	—	8,469	2,915	1968/1979/1987	1997	(1)
250 Binney Street	Office	Cambridge, MA	—	110	4,483	2,939	110	7,422	—	—	7,532	6,769	1983	1997	(1)

188

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
						Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements			Building and Improvements			Land Held for Development			Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances			Land		Building
453 Ravendale Drive	Office	Mountain View, CA	—			5,477		1,090		677		5,477			1,767			—			—		7,244		964		1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—			26		150		5,907		26			6,057			—			—		6,083		3,479		1968	1997	(1)
The Skylyne	Residential	Oakland, CA	—			28,962		239,077		1,784		28,962			240,861			—			—		269,823		14,154		2020	N/A	(1)
Signature at Reston	Residential	Reston, VA	—			27,076		190,580		1,667		27,076			192,247			—			—		219,323		23,353		2018	2013	(1)
Proto Kendall Square	Residential	Cambridge, MA	—			9,243		127,248		3,336		9,245			130,582			—			—		139,827		14,508		2018	2015	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—			3,529		54,891		2,356		3,529			57,247			—			—		60,776		17,174		2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—			478		37,918		29,946		478			67,353			511			—		68,342		50,642		1986/2017	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—			—		35,035		6,384		—			41,419			—			—		41,419		16,909		1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—			1,256		15,697		941		1,256			16,638			—			—		17,894		7,170		2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—			1,163		11,633		446		1,163			12,079			—			—		13,242		12,006		1990	1997	(1)
2100 Pennsylvania Avenue	Development	Washington, DC	—			—		—		472,873		185,203			230,497			—			57,173		472,873		9,755		N/A	N/A	N/A
190 CityPoint (formerly 180 CityPoint)	Development	Waltham, MA	—			—		—		140,370		—			—			—			140,370		140,370		—		N/A	2006	N/A
103 CityPoint	Development	Waltham, MA	—			—		—		44,752		—			—			74			44,678		44,752		—		N/A	2007	N/A
Reston Next Office Phase II	Development	Reston, VA	—			—		—		22,954		—			—			—			22,954		22,954		—		N/A	1998	N/A
Reston Next Retail	Development	Reston, VA	—			—		—		3,199		—			—			—			3,199		3,199		—		N/A	1998	N/A
777 Harrison Street	Land	San Francisco, CA	—			144,647		—		28,239		—			47			172,839			—		172,886		20		N/A	2020	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—			—		—		148,476		—			—			148,476			—		148,476		—		N/A	1997	N/A
Back Bay Station Master Plan	Land	Boston, MA	—			—		—		72,957		—			—			72,957			—		72,957		—		N/A	N/A	N/A
3625-3635 Peterson Way	Land	Santa Clara, CA	—			63,206		—		5,165		—			—			68,371			—		68,371		—		N/A	2016	N/A
North First Master Plan	Land	San Jose, CA	—			35,004		—		3,968		—			—			38,972			—		38,972		—		N/A	2007	N/A
Plaza at Almaden	Land	San Jose, CA	—			—		—		38,090		—			—			38,090			—		38,090		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—			—		—		19,891		—			—			19,891			—		19,891		—		N/A	2007	N/A
CityPoint South Master Plan	Land	Waltham, MA	—			—		—		19,693		—			—			19,693			—		19,693		—		N/A	N/A	N/A
Reston Gateway Master Plan	Land	Reston, VA	—			—		—		12,734		—			—			12,734			—		12,734		—		N/A	1998	N/A
Weston Quarry	Land	Weston, MA	—			—		—		1,249		—			—			1,249			—		1,249		—		N/A	2001	N/A
Broad Run Business Park	Land	Loudoun County, VA	—			—		—		1,184		—			—			1,184			—		1,184		—		N/A	1998	N/A
Reston Overlook Master Plan	Land	Reston, VA	—			—		—		80		—			—			80			—		80		—		N/A	2000	N/A
			$	3,272,368	(2)	$	5,373,987	$	14,755,092	$	5,247,621	$	5,476,618	(3)	$	18,772,007	(4)	$	721,501	(5)	$	406,574	$	25,376,700	$	6,143,384

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $50,310. Accumulated Depreciation does not include approximately $37,090 of accumulated depreciation related to Furniture, Fixtures and Equipment. Office type includes office, life sciences, and retail properties.

The aggregate cost and accumulated depreciation for tax purposes was approximately $25.7 billion and $5.6 billion, respectively.

(1)Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

189

(2)Includes unamortized deferred financing costs totaling approximately $27,632.

(3)Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

(4)Includes Right of Use Assets - Finance Leases of approximately $23,345.

(5)Includes pre-development costs.

190

Boston Properties Limited Partnership

Real Estate and Accumulated Depreciation

December 31, 2022, 2021 and 2020

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2022		2021		2020
Real Estate:
Balance at the beginning of the year	$	23,734,833	$	22,926,494	$	22,449,476
Additions to/improvements of real estate	2,228,000		1,145,084		996,989
Assets sold/written-off	(586,133)		(336,745)		(519,971)
Balance at the end of the year	$	25,376,700	$	23,734,833	$	22,926,494
Accumulated Depreciation:
Balance at the beginning of the year	$	5,736,240	$	5,396,111	$	5,135,289
Depreciation expense	638,538		615,553		566,813
Assets sold/written-off	(231,394)		(275,424)		(305,991)
Balance at the end of the year	$	6,143,384	$	5,736,240	$	5,396,111

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

191

(b) Exhibits

2.1	—	Transfer Agreement, dated May 31, 2013, by and among BP 767 Fifth LLC, Sungate Fifth Avenue LLC, 767 LLC and BP/DC 767 Fifth LLC. (Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on June 3, 2013.)
2.2	—	Purchase and Sale Agreement by and among NBIM Walker 601 LEX NYC LLC, NBIM Walker 100 FED BOS LLC, NBIM Walker ATW BOS LLC and Boston Properties Limited Partnership, dated September 16, 2014. (Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on September 18, 2014.)
3.1	—	Form of Amended and Restated Certificate of Incorporation of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Registration Statement on Form S-11, File No. 333-25279.)
3.2	—	Amended and Restated Certificate of Designations of Series E Junior Participating Cumulative Preferred Stock of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on June 18, 2007.)
3.3	—	Certificate of Amendment of Amended and Restated Certificate of Incorporation of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on May 20, 2010.)
3.4	—	Certificate of Designations of 92,000 shares of 5.25% Series B Cumulative Redeemable Preferred Stock of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.3 to the Registration Statement on Form 8-A of Boston Properties, Inc. filed on March 22, 2013.)
3.5	—	Third Amended and Restated By-laws of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on May 19, 2016.)
3.6	—	Amendment No. 1 to Third Amended and Restated By-laws of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on March 24, 2020.)
3.7	—	Form of Certificate of Designations for Series A Preferred Stock. (Incorporated by reference to Exhibit 99.26 to Boston Properties, Inc.’s Current Report on Form 8-K filed on November 25, 1998.)
4.1	—	Form of Common Stock Certificate. (Incorporated by reference to Exhibit 4.3 to Boston Properties, Inc.’s Registration Statement on Form S-11, File No. 333-25279.)
4.2	—	Description of the Securities of Boston Properties, Inc. and Boston Properties Limited Partnership (Incorporated by reference to Exhibit 4.2 to the Annual Report on Form 10-K of Boston Properties, Inc and Boston Properties Limited Partnership filed on February 25, 2022.)
4.3	—	Indenture, dated as of December 13, 2002, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee. (Incorporated by reference to Exhibit 4.1 to Boston Properties, Inc.’s Current Report on Form 8-K/A filed on December 13, 2002.)
4.4	—	Supplemental Indenture No. 13, dated as of April 11, 2013, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.125% Senior Note due 2023. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on April 11, 2013.)
4.5	—	Supplemental Indenture No. 14, dated as of June 27, 2013, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.800% Senior Note due 2024. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on July 1, 2013.)
4.6	—	Supplemental Indenture No. 15, dated as of January 20, 2016, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.650% Senior Note due 2026. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on January 20, 2016.)
4.7	—	Supplemental Indenture No. 16, dated as of August 17, 2016, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 2.750% Senior Note due 2026. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership and Boston Properties, Inc. filed on August 17, 2016.)

192

4.8	—	Supplemental Indenture No. 17, dated as of December 4, 2017, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 3.200% Senior Note due 2025. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership and Boston Properties, Inc. filed on December 4, 2017.)
4.9	—	Supplemental Indenture No. 18, dated as of November 28, 2018, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 4.500% Senior Note due 2028. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership and Boston Properties, Inc. filed on November 28, 2018.)
4.10	—	Supplemental Indenture No. 19, dated as of June 21, 2019, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 3.400% Senior Note due 2029. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership and Boston Properties, Inc. filed on June 21, 2019.)
4.11	—	Supplemental Indenture No. 20, dated as of September 3, 2019, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 2.900% Senior Note due 2030. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership and Boston Properties, Inc. filed on September 3, 2019.)
4.12	—	Supplemental Indenture No. 21, dated as of May 5, 2020, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 3.250% Senior Note due 2031. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on May 5, 2020.)
4.13	—	Supplemental Indenture No. 22, dated as of March 16, 2021, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 2.550% Senior Note due 2032. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on March 16, 2021.)
4.14	—	Supplemental Indenture No. 23, dated as of September 29, 2021, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 2.450% Senior Note due 2033. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on September 29, 2021.)
4.15	—	Supplemental Indenture No. 24, dated as of November 17, 2022, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee; including a form of the 6.750% Senior Note due 2027. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on November 17, 2022.)
10.1	—	Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of June 29, 1998. (Incorporated by reference to Exhibit 99.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on July 15, 1998.)
10.2	—	Certificate of Designations for the Series Four Preferred Units, dated as of August 29, 2012, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q of Boston Properties, Inc. filed on November 8, 2012.)
10.3	—	Certificate of Designations for the 5.25% Series B Cumulative Redeemable Preferred Units, dated as of March 20, 2013, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on March 22, 2013.)
10.4	—	Forty-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of April 11, 2003, by Boston Properties, Inc., as general partner. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on August 14, 2003.)
10.5	—	Seventy-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of January 24, 2008, by Boston Properties, Inc., as general partner. (Incorporated by reference to Exhibit 10.3 to Boston Properties, Inc.’s Current Report on Form 8-K filed on January 29, 2008.)

193

10.6	—	Ninety-Eighth Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of October 21, 2010. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 5, 2010.)
10.7	—	One Hundred Forty-Ninth Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of December 15, 2017. (Incorporated by reference to Exhibit 10.7 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 28, 2018.)
10.8*	—	Second Amendment and Restatement of Boston Properties, Inc. 1997 Stock Option and Incentive Plan. (Incorporated by reference to Exhibit A to Boston Properties, Inc.’s Proxy Statement on Schedule 14A filed on April 6, 2007.)
10.9*	—	Boston Properties, Inc. 2012 Stock Option and Incentive Plan. (Incorporated by reference to Exhibit A to Boston Properties, Inc.’s Proxy Statement on Schedule 14A filed on March 30, 2012.)
10.10*	—	Boston Properties, Inc. 2021 Stock Incentive Plan. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on May 20, 2021).
10.11*	—	Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.59 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)
10.12*	—	First Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.60 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)
10.13*	—	Second Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.61 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)
10.14*	—	Third Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.3 to the Quarterly Report on Form 10-Q of Boston Properties, Inc. and Boston Properties Limited Partnership filed on August 6, 2021.)
10.15*	—	Boston Properties Deferred Compensation Plan, Amended and Restated Effective as of January 1, 2009. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.16*	—	Employment Agreement by and between Douglas T. Linde and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.12 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.17*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.3 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.18*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.19 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.19*	—	Amended and Restated Employment Agreement by and between Raymond A. Ritchey and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.15 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.20*	—	First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to Exhibit 10.4 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.21*	—	Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to Exhibit 10.22 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.22*	—	Employment Agreement by and between Michael E. LaBelle and Boston Properties, Inc. dated as of January 24, 2008. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.’s Current Report on Form 8-K filed on January 29, 2008.)
10.23*	—	First Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Michael E. LaBelle. (Incorporated by reference to Exhibit 10.27 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)

194

10.24*	—	Employment Agreement by and between Bryan J. Koop and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.25*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.7 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.26*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.33 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.27*	—	Employment Agreement by and between Robert E. Pester and Boston Properties, Inc. dated as of December 16, 2002. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.28*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.9 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.29*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.40 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.30*	—	Employment Agreement by and between Owen D. Thomas and Boston Properties, Inc. dated as of April 2, 2018. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.'s Quarterly Report on Form 10-Q filed on May 8, 2018.)
10.31*	—	Boston Properties, Inc. Senior Executive Severance Plan. (Incorporated by reference to Exhibit 10.19 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.32*	—	First Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.13 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.33*	—	Second Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.52 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.34*	—	Third Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of January 8, 2014. (Incorporated by reference to Exhibit 10.48 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 28, 2014.)
10.35*	—	Boston Properties, Inc. Executive Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.20 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.36*	—	First Amendment to the Boston Properties, Inc. Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.37*	—	Second Amendment to the Boston Properties, Inc. Executive Severance Plan, dated as of January 8, 2014. (Incorporated by reference to Exhibit 10.51 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 28, 2014.)
10.38*	—	Boston Properties, Inc. Officer Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.15 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.39*	—	First Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.16 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.40*	—	Second Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.57 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.41*	—	Form of Indemnification Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and certain officers and directors of the Company. (Incorporated by reference to Exhibit 10.43 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2020.)
10.42*	—	Director Appointment Agreement, dated as of January 20, 2011, by and between Matthew J. Lustig and Boston Properties, Inc. (Incorporated by reference to Exhibit 10.55 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 25, 2011.)

195

10.43*	—	Boston Properties, Inc. Non-Employee Director Compensation Plan. (Incorporated by reference to Appendix B to Boston Properties, Inc.’s Proxy Statement on Schedule 14A filed on April 6, 2022.)
10.44	—	Ninth Amended and Restated Credit Agreement, dated as of June 15, 2021, among Boston Properties Limited Partnership and the lenders identified therein. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on June 16, 2021.)
10.45	—	Credit Agreement, dated as of January 4, 2023, among Boston Properties Limited Partnership and the lenders identified therein. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on January 9, 2023.)
21.1	—	Subsidiaries of Boston Properties, Inc. and Boston Properties Limited Partnership (Filed herewith.)
23.1	—	Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting firm for Boston Properties, Inc. (Filed herewith.)
23.2	—	Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting firm for Boston Properties Limited Partnership. (Filed herewith.)
31.1	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Boston Properties, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
31.2	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Boston Properties, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
31.3	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Boston Properties Limited Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
31.4	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Boston Properties Limited Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
32.1	—	Section 1350 Certification of Chief Executive Officer of Boston Properties, Inc. pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
32.2	—	Section 1350 Certification of Chief Financial Officer of Boston Properties, Inc. pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
32.3	—	Section 1350 Certification of Chief Executive Officer of Boston Properties Limited Partnership pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
32.4	—	Section 1350 Certification of Chief Financial Officer of Boston Properties Limited Partnership pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
101.SCH	—	Inline XBRL Taxonomy Extension Schema Document. (Filed herewith.)
101.CAL	—	Inline XBRL Taxonomy Extension Calculation Linkbase Document. (Filed herewith.)
101.LAB	—	Inline XBRL Taxonomy Extension Label Linkbase Document. (Filed herewith.)
101.PRE	—	Inline XBRL Taxonomy Extension Presentation Linkbase Document. (Filed herewith.)
101.DEF	—	Inline XBRL Taxonomy Extension Definition Linkbase Document. (Filed herewith.)
104	—	Cover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in Exhibits 101.*). (Filed herewith.)
* Indicates management contract or compensatory plan or arrangement required to be filed or incorporated by reference as an exhibit to this Form 10-K pursuant to Item 15(b) of Form 10-K.

Item 16. Form 10-K Summary.

Not Applicable.

196

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Boston Properties, Inc. has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	BOSTON PROPERTIES, INC.
February 27, 2023	/s/    MICHAEL E. LABELLE
	Michael E. LaBelle
	Chief Financial Officer
	(duly authorized officer and principal financial officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of Boston Properties, Inc., and in the capacities and on the dates indicated.

February 27, 2023
	By:	/s/   OWEN D. THOMAS
		Owen D. Thomas Chairman of the Board, Chief Executive Officer and Principal Executive Officer
	By:	/s/    DOUGLAS T. LINDE
		Douglas T. Linde Director and President
	By:	/s/    KELLY A. AYOTTE
		Kelly A. Ayotte Director
	By:	/s/    BRUCE W. DUNCAN
		Bruce W. Duncan Director
	By:	/s/    CAROL B. EINIGER
		Carol B. Einiger Director
	By:	/s/    DIANE J. HOSKINS
		Diane J. Hoskins Director
	By:	/s/    MARY E. KIPP
		Mary E. Kipp Director
	By:	/s/    JOEL I. KLEIN
		Joel I. Klein Director

197

By:	/s/    MATTHEW J. LUSTIG
	Matthew J. Lustig Director
By:	/s/    DAVID A. TWARDOCK
	David A. Twardock Director
By:	/s/    WILLIAM H. WALTON, III
	William H. Walton, III Director
By:	/s/    MICHAEL E. LABELLE
	Michael E. LaBelle Executive Vice President, Chief Financial Officer and Principal Financial Officer
By:	/s/    MICHAEL R. WALSH
	Michael R. Walsh Senior Vice President, Chief Accounting Officer and Principal Accounting Officer

198

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Boston Properties Limited Partnership has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	BOSTON PROPERTIES LIMITED PARTNERSHIP
	By: Boston Properties, Inc., its General Partner
February 27, 2023	/s/    MICHAEL E. LABELLE
	Michael E. LaBelle
	Chief Financial Officer (duly authorized officer and principal financial officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of Boston Properties, Inc., as general partner of Boston Properties Limited Partnership, and in the capacities and on the dates indicated.

February 27, 2023
	By:	/s/   OWEN D. THOMAS
		Owen D. Thomas Chairman of the Board, Chief Executive Officer and Principal Executive Officer
	By:	/s/    DOUGLAS T. LINDE
		Douglas T. Linde Director and President
	By:	/s/    KELLY A. AYOTTE
		Kelly A. Ayotte Director
	By:	/s/    BRUCE W. DUNCAN
		Bruce W. Duncan Director
	By:	/s/    CAROL B. EINIGER
		Carol B. Einiger Director
	By:	/s/    DIANE J. HOSKINS
		Diane J. Hoskins Director
	By:	/s/    MARY E. KIPP
		Mary E. Kipp Director
	By:	/s/    JOEL I. KLEIN
		Joel I. Klein Director

199

By:	/s/    MATTHEW J. LUSTIG
	Matthew J. Lustig Director
By:	/s/    DAVID A. TWARDOCK
	David A. Twardock Director
By:	/s/    WILLIAM H. WALTON, III
	William H. Walton, III Director
By:	/s/    MICHAEL E. LABELLE
	Michael E. LaBelle Executive Vice President, Chief Financial Officer and Principal Financial Officer
By:	/s/    MICHAEL R. WALSH
	Michael R. Walsh Senior Vice President, Chief Accounting Officer and Principal Accounting Officer

200

EX-21.1

Exhibit 21.1

All of the following are subsidiaries of both Boston Properties, Inc. and Boston Properties Limited Partnership, except Boston Properties Limited Partnership is only a subsidiary of Boston Properties, Inc.

Entity Name	State of Organization
100 Federal JV LLC	Delaware
100 Federal Subsidiary REIT LLC	Delaware
100 Federal TRS LLC	Delaware
101 Carnegie Center Associates	New Jersey
121 Broadway LLC	Delaware
125 Broadway LLC	Delaware
1265 Main Office JV LLC	Delaware
1265 Main Office Subsidiary LLC	Delaware
1330 Connecticut Fitness Center TRS LLC	Delaware
17M Associates L.P.	District of Columbia
191 Spring Street Trust	Massachusetts
200 Fifth Avenue JV LLC	Delaware
200 Fifth Owner LLC	Delaware
206 Associates Limited Partnership	New Jersey
210 Associates Limited Partnership	New Jersey
211 Associates Limited Partnership	New Jersey
290 Binney LLC	Delaware
3HBXP LLC	Vermont
30 Shattuck Road LLC	Delaware
347 Madison Avenue Venture, LLC	Delaware
360 PAS Holdco LLC	Delaware
360 PAS Owner LLC	Delaware
360 PAS Promote-C LP	Delaware
360 PAS Promote-G LP	Delaware
360 PAS REIT LLC	Delaware
399 Services LLC	Delaware
40-46 Harvard Street Trust	Massachusetts
500 North Capitol LLC	Delaware
500 North Capitol Venture LLC	Delaware
501 K Street LLC	Delaware
501 K Street Property Owner LLC	Delaware
601 & 651 Gateway Center LP	Delaware
601 Mass Fitness Center TRS LLC	Delaware
611 Gateway Center LP	Delaware
635 Mass Ave LLC	Delaware
681 Gateway Center LLC	Delaware
701 Gateway Center LLC	Delaware
751 Gateway Center LLC	Delaware
751 Gateway Holdings LLC	Delaware
751 Gateway Member LLC	Delaware
767 Fifth Junior Mezz LLC	Delaware
767 Fifth Lender LLC	Delaware
767 Fifth Partners LLC	Delaware

Entity Name	State of Organization
767 Fifth Senior Mezz LLC	Delaware
767 Fifth TRS LLC	Delaware
767 Venture, LLC	Delaware
7750 Wisconsin Avenue LLC	Delaware
7750 Wisconsin Avenue Property Owner LLC	Delaware
880 Winter Street Cafe LLC	Delaware
890 Winter Street Cafe LLC	Delaware
90 Church Street Limited Partnership	Delaware
901 New York Avenue Fitness Center LLC	Delaware
901 New York LLC	Delaware
901 New York REIT LLC	Delaware
91 Hartwell Avenue Trust	Massachusetts
92 Hayden Avenue Trust	Massachusetts
AJ Lot 2R Financing LLC	Delaware
AJ Lot 2R LLC	Delaware
AJ Lot 3R Financing LLC	Delaware
AJ Lot 3R LLC	Delaware
AJ Lot 8 LLC	Delaware
Annapolis Junction NFM LLC	Delaware
Atlantic Wharf JV LLC	Delaware
Atlantic Wharf Subsidiary REIT LLC	Delaware
Block 4 LLC	Delaware
BNY Tower Associates LLC	Delaware
BNY Tower Holdings LLC	Delaware
BNYTA Amenity Operator LLC	Delaware
Boston Properties Limited Partnership	Delaware
Boston Properties LLC	Delaware
Boston Properties Services, LLC	Delaware
Boston Properties TRS, Inc.	Delaware
BP 10 CityPoint Cafe LLC	Delaware
BP 103 Fourth Avenue LLC	Delaware
BP 111 Huntington Ave LLC	Delaware
BP 1265 Main LLC	Delaware
BP 1330 Connecticut Avenue LLC	Delaware
BP 1333 New Hampshire Avenue LLC	Delaware
BP 140 Kendrick Street Cafe LLC	Delaware
BP 140 Kendrick Street LLC	Delaware
BP 140 Kendrick Street Property LLC	Delaware
BP 17 Hartwell LLC	Delaware
BP 200 Clarendon Cafe LLC	Delaware
BP 201 Spring Street LLC	Delaware
BP 230 City Point Cafe LLC	Delaware
BP 347 Madison Associates, LLC	Delaware
BP 347 Madison Developer LLC	Delaware
BP 399 Park Avenue LLC	Delaware
BP 3HB Developer LLC	Delaware
BP 3HB Lender LLC	Delaware
BP 3HB Member LLC	Delaware

Entity Name	State of Organization
BP 500 North Capitol LLC	Delaware
BP 501 K Street Member LLC	Delaware
BP 510 Madison Ave LLC	Delaware
BP 510 Madison HC LLC	Delaware
BP 510 Madison LLC	Delaware
BP 599 Lexington Avenue LLC	Delaware
BP 767 Fifth LLC	Delaware
BP 888 Boylston LLC	Delaware
BP 99 Third Avenue LLC	Delaware
BP Atlantic Wharf Master Tenant LLC	Delaware
BP AW Garage LLC	Delaware
BP AW Retail LLC	Delaware
BP AW Tower Office LLC	Delaware
BP AW Waterfront Office LLC	Delaware
BP AWRR Trustee I LLC	Delaware
BP AWRR Trustee II LLC	Delaware
BP AWTO Trustee I LLC	Delaware
BP AWTO Trustee II LLC	Delaware
BP AWTO Trustee III LLC	Delaware
BP Bay Colony Cafe LLC	Delaware
BP Bay Colony HC LLC	Delaware
BP Bay Colony Holdings LLC	Delaware
BP Bay Colony LLC	Delaware
BP Bedford Street Cafe LLC	Delaware
BP Belvidere LLC	Delaware
BP Cambridge Center Residential LLC	Delaware
BP CGC II Retail Operator LLC	Delaware
BP CityPoint Association Member LLC	Delaware
BP Crane Meadow, L.L.C.	Delaware
BP East Garage LLC	Delaware
BP EC1 Holdings LLC	Delaware
BP EC2 Holdings LLC	Delaware
BP EC3 Holdings LLC	Delaware
BP EC4 Holdings LLC	Delaware
BP Federal Street LLLC	Delaware
BP Five CC LLC	Delaware
BP Four CC LLC	Delaware
BP Fourth Avenue Cafe LLC	Delaware
BP Fourth Avenue, LLC	Delaware
BP Hancock LLC	Delaware
BP Hancock Parking LLC	Delaware
BP Hartwell Avenue Cafe LLC	Delaware
BP Hayden Avenue Cafe LLC	Delaware
BP Hotel JV Member LLC	Delaware
BP Hotel LLC	Delaware
BP II LLC	Delaware
BP III LLC	Delaware
BP Jones Road Cafe LLC	Delaware

Entity Name	State of Organization
BP Kingstowne Office Building K LLC	Delaware
BP Kingstowne Office Building T LLC	Delaware
BP Kingstowne Theatre LLC	Delaware
BP LOP LLC	Delaware
BP Mall Road Cafe LLC	Delaware
BP Management, L.P.	Delaware
BP Market Square North GP LLC	Delaware
BP Mill Road Cafe LLC	Delaware
BP Navy Yard Member LLC	Delaware
BP Navy Yard TRS LLC	Delaware
BP New Dominion Technology Park II LLC	Delaware
BP New York LLC	Delaware
BP Office JV Member LLC	Delaware
BP Podium JV Member LLC	Delaware
BP Prospect Place LLC	Delaware
BP Prucenter Acquisition LLC	Delaware
BP Prucenter Development LLC	Delaware
BP Prucenter Exeter LLC	Delaware
BP Prucenter Fairfield LLC	Delaware
BP RB Developer LLC	Delaware
BP Realty New Jersey, LLC	New Jersey
BP Realty Washington LLC	Delaware
BP Reservoir Place Cafe LLC	Delaware
BP Reservoir Place Fitness LLC	Delaware
BP Reservoir Place LLC	Delaware
BP Residential JV Member LLC	Delaware
BP Reston Eastgate, LLC	Delaware
BP RTC Member LLC	Delaware
BP Russia Building LLC	Delaware
BP Russia Wharf LLC	Delaware
BP Services TRS LLC	Delaware
BP Seven Cambridge Center LLC	Delaware
BP Seventeen Cambridge Center LLC	Delaware
BP Spring Street Cafe LLC	Delaware
BP Supermarket LLC	Delaware
BP Third Avenue LLC	Delaware
BP Times Square Tower Mezzanine LLC	Delaware
BP West Street Cafe LLC	Delaware
BP Weston Quarry LLC	Delaware
BP Weston Quarry Residential LLC	Delaware
BP/CGCenter I LLC	Delaware
BP/CGCenter II LLC	Delaware
BP/CGCenter MM LLC	Delaware
BP/CRF 901 New York Avenue LLC	Delaware
BP/CRF Metropolitan Square LLC	Delaware
BP/DC 767 Fifth LLC	Delaware
BP/DC Properties, Inc.	Maryland
BP/DC REIT LLC	Delaware

Entity Name	State of Organization
BP/M 3HB Owner LLC	Delaware
BP-AJ LLC	Delaware
BPI EC4 LLC	Delaware
BPLP SMBP GP LLC	Delaware
BPLP SMBP LP LLC	Delaware
BP-M 3HB Holdco LLC	Delaware
BP-M 3HB Mezz LLC	Delaware
BP-M 3HB Venture LLC	Delaware
BPNS Garage General LLC	Delaware
BPNS Garage Limited LLC	Delaware
BPNS Hotel General LLC	Delaware
BPNS Hotel Limited LLC	Delaware
BPNS Office General LLC	Delaware
BPNS Office Limited LLC	Delaware
BPNS Podium General LLC	Delaware
BPNS Podium Limited LLC	Delaware
BPNS Residential General LLC	Delaware
BPNS Residential Limited LLC	Delaware
BP-WP Project Developer Manager LLC	Delaware
BXP 17Fifty LLC	Delaware
BXP 200 Fifth LLC	Delaware
BXP 200 Fifth Management LLC	Delaware
BXP 2100 Penn LLC	Delaware
BXP 360 Manager LLC	Delaware
BXP 360 Member LLC	Delaware
BXP 360 PAS Appointer LLC	Delaware
BXP 360 Promote GP LLC	Delaware
BXP 7750 Wisconsin Avenue LLC	Delaware
BXP Almaden Associates LP	Delaware
BXP Beach Cities LLC	Delaware
BXP California GP LLC	Delaware
BXP Carnegie Owner LLC	Delaware
BXP Colorado Center Appointer LLC	Delaware
BXP Colorado Center Manager LLC	Delaware
BXP Colorado GP LLC	Delaware
BXP Colorado LP LLC	Delaware
BXP CP South LLC	Delaware
BXP EIP Investor LLC	Delaware
BXP Folsom-Hawthorne LP	Delaware
BXP Gateway Developer LLC	Delaware
BXP Gateway Member LLC	Delaware
BXP Harrison LLC	Delaware
BXP Investments LLC	Delaware
BXP MacArthur LLC	Delaware
BXP Madison Centre I LLC	Delaware
BXP Madison Centre II LLC	Delaware
BXP Madison Centre Manager LLC	Delaware
BXP Mission 535 LP	Delaware

Entity Name	State of Organization
BXP North First LP	Delaware
BXP Peterson LP	Delaware
BXP Platform 16 GP LLC	Delaware
BXP Platform 16 LP LLC	Delaware
BXP Ravendale LP	Delaware
BXP Research Park LP	Delaware
BXP Reston Next Developer LLC	Delaware
BXP Reston Next Member LLC	Delaware
BXP Safeco Plaza Appointer LLC	Delaware
BXP Safeco Plaza Manager LLC	Delaware
BXP Safeco Plaza Member LLC	Delaware
BXP Safeco Plaza Promote GP LLC	Delaware
BXP SCP TRS LLC	Delaware
BXP Second Ave LLC	Delaware
BXP Shady Grove Lot 5 LLC	Delaware
BXP Shady Grove Lot 6 LLC	Delaware
BXP Shady Grove Lot 7 LLC	Delaware
BXP Shady Grove Lot 8 LLC	Delaware
BXP TB Development LLC	Delaware
BXP Transbay Management LLC	Delaware
BXP VB TRS LLC	Delaware
BXP Waltham Woods LLC	Delaware
BXP West El Camino LP	Delaware
BXP Zanker Road LP	Delaware
CA-Colorado Center Limited Partnership	Delaware
CA-Colorado Center, L.L.C.	Delaware
Cambridge Center North Trust	Massachusetts
Cambridge Center West Garage LLC	Delaware
Cambridge Center West Trust	Massachusetts
Carnegie 103 Associates, LLC	Delaware
Carnegie 214 Associates Limited Partnership	New Jersey
Carnegie 408 Associates, LLC	Delaware
Carnegie 504 Associates	New Jersey
Carnegie 506 Associates	New Jersey
Carnegie 508 Associates	New Jersey
Carnegie 510 Associates, L.L.C.	Delaware
Carnegie 804 Associates, LLC	Delaware
Carnegie Center Associates	New Jersey
Carnegie Center Cafes LLC	Delaware
Carnegie Center Fitness LLC	Delaware
CRF Met Square, LLC	Delaware
Discovery Square, L.L.C.	Delaware
Downtown Boston Properties Trust	Massachusetts
Elandzee Trust	Massachusetts
Eleven Cambridge Center Trust	Massachusetts
Embarcadero Center Associates	California
Four Embarcadero Center Venture	California
Fourteen Cambridge Center Trust	Massachusetts

Entity Name	State of Organization
Gateway Center GP LLC	Delaware
Gateway Center TRS LLC	Delaware
Gateway Portfolio Holdings LLC	Delaware
Gateway Portfolio Member LLC	Delaware
Gladden Properties LLC	Delaware
Harrison 759 LLC	Delaware
Hayden Office Trust	Massachusetts
Hotel Tower Developer LLC	Delaware
Hotel Tower Owner GP, LLC	Delaware
Hotel Tower Owner, LP	Delaware
IXP, LLC	Vermont
Jones Road Development Associates LLC	Delaware
Lexreal Associates Limited Partnership	New York
LKE BP Fourth Avenue Limited Partnership	Massachusetts
Mall Road Trust	Massachusetts
Market Square North Associates Limited Partnership	Delaware
Market Square North Fitness Center LLC	Delaware
MBZ-Lex Trust	Massachusetts
Metropolitan Square Fitness Center TRS LLC	Delaware
Metropolitan Square Holdco LLC	Delaware
Metropolitan Square Mezz A LLC	Delaware
Metropolitan Square REIT LLC	Delaware
New Dominion Technology Corp.	Delaware
New Dominion Technology Park II LLC	Delaware
New Dominion Technology Park LLC	Delaware
No. 1 Times Square Development LLC	Delaware
No. 5 Times Square Development LLC	Delaware
NY 510 Junior Mezz Lender LLC	Delaware
NYXP, LLC	Vermont
Ocean View Development Company Limited Partnership	District of Columbia
Office Tower Developer LLC	Delaware
Office Tower Owner GP, LLC	Delaware
Office Tower Owner, LP	Delaware
One Cambridge Center Trust	Massachusetts
One Embarcadero Center Venture	California
One Freedom Square, L.L.C.	Delaware
One Tower Center Cafe LLC	Delaware
Platform 16 Developer LLC	Delaware
Platform 16 Holdings LP	Delaware
Platform 16 Sub LLC	Delaware
Platform 16 LLC	Delaware
Podium Developer LLC	Delaware
Podium Owner GP, LLC	Delaware
Podium Owner, LP	Delaware
PR II/BXP Reston Gateway LLC	Delaware
Princeton 202 Associates Limited Partnership	New Jersey
Princeton Childcare Associates Limited Partnership	New Jersey
Residential Tower Developer LLC	Delaware

Entity Name	State of Organization
Residential Tower Owner GP, LLC	Delaware
Residential Tower Owner, LP	Delaware
Reston Corporate Center Limited Partnership	Virginia
Reston Gateway Condo A/B, LLC	Delaware
Reston Gateway Condo C, LLC	Delaware
Reston Gateway Condo D1, LLC	Delaware
Reston Gateway Condo D2, LLC	Delaware
Reston Gateway Condo D3, LLC	Delaware
Reston Streets LLC	Delaware
Reston Town Center JV LLC	Delaware
Reston Town Center Office Park Phase One Limited Partnership	Virginia
Reston Town Center Property LLC	Delaware
Reston VA 939, L.L.C.	Delaware
Rosecrans-Sepulveda Partners 4, LLC	Delaware
RTC Gift Card LLC	Delaware
Russia Building TRS LLC	Delaware
Safeco Plaza LLC	Delaware
Safeco Plaza Promote-G LP	Delaware
Safeco Plaza Promote-K LP	Delaware
Safeco Plaza REIT LLC	Delaware
School Street Associates Limited Partnership	District of Columbia
SCV Partners	New Jersey
SMBP LLC	Delaware
SMBP REIT LLC	Delaware
SMBP Venture LLC	Delaware
South of Market Garage LLC	Delaware
South of Market LLC	Delaware
South of Market Lot 16 LLC	Delaware
Springfield 6601 LLC	Delaware
Springfield Metro Center II, LLC	Delaware
Springfield Parcel C LLC	Delaware
Square 36 Office Joint Venture	District of Columbia
Square 407 Limited Partnership	District of Columbia
Square 54 Office Fitness TRS LLC	Delaware
Square 54 Office Owner LLC	Delaware
Square 54 Residential Owner LLC	Delaware
Stony Brook Associates LLC	Delaware
Ten Cambridge Center Trust	Massachusetts
The Atlantic Monthly Trust	Massachusetts
The Double B Partnership	Massachusetts
The Double B Trust	Massachusetts
The Metropolitan Square Associates LLC	Delaware
Three Cambridge Center Trust	Massachusetts
Three Embarcadero Center Venture	California
Times Square Tower Associates LLC	Delaware
Tower Oaks Financing LLC	Delaware
Tracer Lane Trust II	Massachusetts
Transbay Tower Holdings LLC	Delaware

Entity Name	State of Organization
Transbay Tower LLC	Delaware
Two Cambridge Center Trust	Massachusetts
Two Freedom Square, L.L.C.	Delaware
Washingtonian North Associates Limited Partnership	Maryland
Wisconsin Place Office LLC	Delaware
Wisconsin Place Office Manager LLC	Delaware
WP Project Developer LLC	Delaware
WP Trust	Massachusetts
Zee Bee Trust II	Massachusetts
Zee Em Trust II	Massachusetts

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-238620, 333- 238607, 333-135189, 333-135187, 333-101255, 333-92402, 333-82498, 333-58694, 333-51024, 333-40618, 333-39114, 333-36142, 333-91425, 333-86585, 333-83859, 333-83861, 333-83863, 333-83867, 333-83869, 333-80513, 333-70765, 333-68379, 333-61799, and 333-60219) and Form S-8 (No. 333-256341, 333-181483, 333-81824, 333-54550, 333-70321, and 333-52845) of Boston Properties, Inc. of our report dated February 27, 2023 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Boston, MA

February 27, 2023

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-238607-01) and Form S-8 (No. 333-256341-01, 333-181483-01, 333-148926 and 333-112109) of Boston Properties Limited Partnership of our report dated February 27, 2023 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Boston, MA

February 27, 2023

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Owen D. Thomas, certify that:

1.    I have reviewed this Annual Report on Form 10-K of Boston Properties, Inc.;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 27, 2023

/s/    OWEN D. THOMAS

Owen D. Thomas

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Michael E. LaBelle, certify that:

1.    I have reviewed this Annual Report on Form 10-K of Boston Properties, Inc.;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 27, 2023

/s/    MICHAEL E. LABELLE      

Michael E. LaBelle

Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION

I, Owen D. Thomas, certify that:

1.    I have reviewed this Annual Report on Form 10-K of Boston Properties Limited Partnership;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 27, 2023

/s/    OWEN D. THOMAS 

Owen D. Thomas
Chief Executive Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-31.4

Exhibit 31.4

CERTIFICATION

I, Michael E. LaBelle, certify that:

1.    I have reviewed this Annual Report on Form 10-K of Boston Properties Limited Partnership;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 27, 2023

/s/    MICHAEL E. LABELLE 

Michael E. LaBelle
Chief Financial Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company’s Annual Report on Form 10-K for the period ended December 31, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 27, 2023

/s/    OWEN D. THOMAS  

Owen D. Thomas

Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company's Annual Report on Form 10-K for the period ended December 31, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 27, 2023

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle

Chief Financial Officer

EX-32.3

Exhibit 32.3

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”), hereby certifies to his knowledge that the Operating Partnership's Annual Report on Form 10-K for the period ended December 31, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 27, 2023

/s/    OWEN D. THOMAS

Owen D. Thomas
Chief Executive Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-32.4

Exhibit 32.4

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”), hereby certifies to his knowledge that the Operating Partnership’s Annual Report on Form 10-K for the period ended December 31, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 27, 2023

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle
Chief Financial Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

XML

Cover - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 21, 2023	Jun. 30, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	1-13087
Entity Registrant Name	BOSTON PROPERTIES, INC.
Entity Central Index Key	0001037540
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2473675
Entity Address, Address Line One	Prudential Center, 800 Boylston Street, Suite 1900
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199-8103
City Area Code	617
Local Phone Number	236-3300
Title of 12(b) Security	Common Stock, par value $.01 per share
Entity Listing, Par Value Per Share	$ 0.01
Trading Symbol	BXP
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 13,917,004,905
Documents Incorporated by Reference	Certain information contained in Boston Properties Inc.’s Proxy Statement relating to its Annual Meeting of Stockholders to be held May 23, 2023 is incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. Boston Properties, Inc. intends to file such Proxy Statement with the Securities and Exchange Commission not later than 120 days after the end of its fiscal year ended December 31, 2022.
Entity Common Stock, Shares Outstanding		156,822,702
Boston Properties Limited Partnership
Entity Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Entity File Number	0-50209
Entity Registrant Name	BOSTON PROPERTIES LIMITED PARTNERSHIP
Entity Central Index Key	0001043121
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3372948
Title of 12(g) Security	Units of Limited Partnership
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false

XML

Audit Information	12 Months Ended
	Dec. 31, 2022
Auditor [Line Items]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Boston, Massachusetts
Auditor Firm ID	238
Boston Properties Limited Partnership
Auditor [Line Items]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Boston, Massachusetts
Auditor Firm ID	238

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$ 25,389,663	$ 23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510	237,507
Right of use assets - operating leases	167,351	169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,298,082)	(5,883,961)
Total real estate	19,496,442	18,275,954
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333	452,692
Cash held in escrows	46,479	48,466
Investments in securities	32,277	43,632
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389	70,186
Related party note receivable, net	78,576	78,336
Notes receivable, net	0	9,641
Sales-type lease receivable, net	12,811	0
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580	1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282	618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589	57,811
Investments in unconsolidated joint ventures	1,715,911	1,482,997
Total assets	24,207,669	22,365,258
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Unsecured senior notes, net	10,237,968	9,483,695
Unsecured line of credit	0	145,000
Unsecured term loan	730,000	0
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335	244,421
Lease liabilities - operating leases	204,686	204,561
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545	320,775
Dividends and distributions payable	170,643	169,859
Accrued interest payable	103,774	94,796
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	450,918	391,441
Total liabilities	15,837,237	14,322,462
Redeemable deferred stock units— 97,853 and 83,073 units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	$ 6,613	$ 9,568
Excess stock, shares outstanding	0	0
Excess stock, shares issued	0	0
Preferred stock / units, shares / units issued (in shares / units)	0	0
Preferred stock / units, shares / units outstanding (in shares / units)	0	0
Equity / Capital:
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding	$ 0	$ 0
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value, 250,000,000 shares authorized, 156,836,767 and 156,623,749 issued and 156,757,867 and 156,544,849 outstanding at December 31, 2022 and December 31, 2021, respectively	1,568	1,565
Additional paid-in capital	6,539,147	6,497,730
Dividends in excess of earnings	(391,356)	(625,891)
Treasury common stock at cost, 78,900 shares at December 31, 2022 and December 31, 2021	(2,722)	(2,722)
Accumulated other comprehensive loss	(13,718)	(36,662)
Total stockholders' equity attributable to Boston Properties, Inc.	6,132,919	5,834,020
Noncontrolling interests:
Common units of the Operating Partnership	683,583	642,655
Property partnerships	1,547,317	1,556,553
Total equity / capital	8,363,819	8,033,228
Total liabilities and equity / capital	24,207,669	22,365,258
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	25,022,149	23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510	237,507
Right of use assets - operating leases	167,351	169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,180,474)	(5,772,018)
Total real estate	19,246,536	18,014,510
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333	452,692
Cash held in escrows	46,479	48,466
Investments in securities	32,277	43,632
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389	70,186
Related party note receivable, net	78,576	78,336
Notes receivable, net	0	9,641
Sales-type lease receivable, net	12,811	0
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580	1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282	618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589	57,811
Investments in unconsolidated joint ventures	1,715,911	1,482,997
Total assets	23,957,763	22,103,814
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Unsecured senior notes, net	10,237,968	9,483,695
Unsecured line of credit	0	145,000
Unsecured term loan	730,000	0
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335	244,421
Lease liabilities - operating leases	204,686	204,561
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545	320,775
Dividends and distributions payable	170,643	169,859
Accrued interest payable	103,774	94,796
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	450,918	391,441
Total liabilities	15,837,237	14,322,462
Redeemable deferred stock units— 97,853 and 83,073 units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	6,613	9,568
Noncontrolling interest:
Redeemable partnership units— 16,531,172 and 16,561,186 common units and 1,679,175 and 1,485,376 long term incentive units outstanding at redemption value at December 31, 2022 and December 31, 2021, respectively	1,280,886	2,078,603
Equity / Capital:
Boston Properties Limited Partnership partners’ capital— 1,749,682 and 1,745,914 general partner units and 155,008,185 and 154,798,935 limited partner units outstanding at December 31, 2022 and December 31, 2021, respectively	5,299,428	4,173,290
Accumulated other comprehensive loss	(13,718)	(36,662)
Total partners’ capital	5,285,710	4,136,628
Noncontrolling interests in property partnerships	1,547,317	1,556,553
Noncontrolling interests:
Total equity / capital	6,833,027	5,693,181
Total liabilities and equity / capital	$ 23,957,763	$ 22,103,814

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$ 25,389,663	$ 23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510	237,507
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,298,082)	(5,883,961)
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333	452,692
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389	70,186
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580	1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282	618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589	57,811
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335	244,421
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545	320,775
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	$ 450,918	$ 391,441
Reedemable deferred stock units, units	97,853	83,073
Limited Partners' Capital Account, Units Outstanding (in units)	155,008,185
General Partners' Capital Account, Units Outstanding (in units)	1,749,682
Excess stock, par value	$ 0.01	$ 0.01
Excess stock, shares authorized	150,000,000	150,000,000
Excess stock, shares outstanding	0	0
Excess stock, shares issued	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock / units, shares / units issued (in shares / units)	0	0
Preferred stock / units, shares / units outstanding (in shares / units)	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	156,836,767	156,623,749
Common Stock, Shares, Outstanding	156,757,867	156,544,849
Treasury common stock at cost, shares	78,900	78,900
Boston Properties Limited Partnership
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$ 25,022,149	$ 23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	237,510	237,507
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(6,180,474)	(5,772,018)
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	690,333	452,692
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	81,389	70,186
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	1,276,580	1,226,745
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	733,282	618,798
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	43,589	57,811
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	249,335	244,421
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	417,545	320,775
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	$ 450,918	$ 391,441
Reedemable deferred stock units, units	97,853	83,073
Limited Partners' Capital Account, Units Outstanding (in units)	155,008,185	154,798,935
General Partners' Capital Account, Units Outstanding (in units)	1,749,682	1,745,914
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding	16,531,172	16,561,186
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding	1,679,175	1,485,376
Variable Interest Entity, Primary Beneficiary [Member]
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	$ 6,789,029	$ 6,702,830
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(1,381,401)	(1,283,060)
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	259,658	300,937
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	16,521	6,824
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	367,138	357,395
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	176,597	174,637
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	11,647	29,668
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	20,604	20,458
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	29,466	29,464
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	114,232	150,131
Variable Interest Entity, Primary Beneficiary [Member] | Boston Properties Limited Partnership
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,789,029 and $6,702,830 at December 31, 2022 and December 31, 2021, respectively)	6,789,029	6,702,830
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2022 and December 31, 2021, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,381,401) and $(1,283,060) at December 31, 2022 and December 31, 2021, respectively)	(1,381,401)	(1,283,060)
Cash and cash equivalents (amounts related to VIEs of $259,658 and $300,937 at December 31, 2022 and December 31, 2021, respectively)	259,658	300,937
Tenant and other receivables, net (amounts related to VIEs of $16,521 and $6,824 at December 31, 2022 and December 31, 2021, respectively)	16,521	6,824
Accrued rental income, net (amounts related to VIEs of $367,138 and $357,395 at December 31, 2022 and December 31, 2021, respectively)	367,138	357,395
Deferred charges, net (amounts related to VIEs of $176,597 and $174,637 at December 31, 2022 and December 31, 2021, respectively)	176,597	174,637
Prepaid expenses and other assets (amounts related to VIEs of $11,647 and $29,668 at December 31, 2022 and December 31, 2021, respectively)	11,647	29,668
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)	3,272,368	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,604 and $20,458 at December 31, 2022 and December 31, 2021, respectively)	20,604	20,458
Accounts payable and accrued expenses (amounts related to VIEs of $29,466 and $29,464 at December 31, 2022 and December 31, 2021, respectively)	29,466	29,464
Other liabilities (amounts related to VIEs of $114,232 and $150,131 at December 31, 2022 and December 31, 2021, respectively)	$ 114,232	$ 150,131

XML

Consolidated Statements Of Operations - USD ($) shares in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue
Lease		$ 2,918,368,000	$ 2,753,014,000	$ 2,646,261,000
Total revenue		3,108,581,000	2,888,621,000	2,765,686,000
Expenses
Rental		1,108,070,000	1,021,151,000	1,017,208,000
General and administrative		146,378,000	151,573,000	133,112,000
Transaction costs		2,905,000	5,036,000	1,531,000
Depreciation and amortization		749,775,000	717,336,000	683,751,000
Total expenses		2,050,056,000	1,920,581,000	1,860,364,000
Other income (expense)
Loss from Unconsolidated Joint Ventures		(59,840,000)	(2,570,000)	(85,110,000)
Gains on sales of real estate		437,019,000	123,660,000	618,982,000
Gain on sales-type lease		10,058,000	0	0
Interest and other income (loss)		11,940,000	5,704,000	5,953,000
Other Income - assignment fee		6,624,000	0	0
Gains (losses) from investments in securities		(6,453,000)	5,626,000	5,261,000
Unrealized loss on non-real estate investment		(150,000)	0	0
Losses from early extinguishment of debt		0	(45,182,000)	0
Interest expense		(437,139,000)	(423,346,000)	(431,717,000)
Net income		1,020,584,000	631,932,000	1,018,691,000
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(74,857,000)	(70,806,000)	(48,260,000)
Noncontrolling interest - common units of the Operating Partnership		(96,780,000)	(55,931,000)	(97,704,000)
Net income attributable to the Company		848,947,000	505,195,000	872,727,000
Preferred dividends / distributions		0	(2,560,000)	(10,500,000)
Preferred Stock Redemption Charge		0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 848,947,000	$ 496,223,000	$ 862,227,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 5.41	$ 3.18	$ 5.54
Weighted average number of common shares / units outstanding (in shares / units)		156,726	156,116	155,432
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 5.40	$ 3.17	$ 5.54
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		157,137	156,376	155,517
Boston Properties Limited Partnership
Revenue
Lease		$ 2,918,368,000	$ 2,753,014,000	$ 2,646,261,000
Total revenue		3,108,581,000	2,888,621,000	2,765,686,000
Expenses
Rental		1,108,070,000	1,021,151,000	1,017,208,000
General and administrative		146,378,000	151,573,000	133,112,000
Transaction costs		2,905,000	5,036,000	1,531,000
Depreciation and amortization		742,293,000	709,035,000
Total expenses		2,042,574,000	1,912,280,000	1,853,279,000
Other income (expense)
Loss from Unconsolidated Joint Ventures		(59,840,000)	(2,570,000)	(85,110,000)
Gains on sales of real estate		441,075,000	125,198,000	631,945,000
Gain on sales-type lease		10,058,000	0	0
Interest and other income (loss)		11,940,000	5,704,000	5,953,000
Other Income - assignment fee		6,624,000	0	0
Gains (losses) from investments in securities		(6,453,000)	5,626,000	5,261,000
Unrealized loss on non-real estate investment		(150,000)	0	0
Losses from early extinguishment of debt		0	(45,182,000)	0
Interest expense		(437,139,000)	(423,346,000)	(431,717,000)
Net income		1,032,122,000	641,771,000	1,038,739,000
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(74,857,000)	(70,806,000)	(48,260,000)
Net income attributable to the Company		957,265,000	570,965,000	990,479,000
Preferred dividends / distributions		0	(2,560,000)	(10,500,000)
Preferred Stock Redemption Charge		0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 957,265,000	$ 561,993,000	$ 979,979,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 5.48	$ 3.25	$ 5.67
Weighted average number of common shares / units outstanding (in shares / units)		174,360	173,150	172,643
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 5.47	$ 3.24	$ 5.67
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		174,771	173,410	172,728
Parking and Other [Member]
Revenue
Other revenue		$ 107,225,000	$ 81,814,000	$ 70,680,000
Parking and Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		107,225,000	81,814,000	70,680,000
Hotel [Member]
Revenue
Other revenue	[1]	39,482,000	13,609,000	7,478,000
Expenses
Operating expense		27,478,000	12,998,000	13,136,000
Hotel [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		39,482,000	13,609,000	7,478,000
Expenses
Operating expense		27,478,000	12,998,000	13,136,000
Real Estate, Other [Member]
Revenue
Other revenue		15,450,000	12,487,000	11,626,000
Expenses
Operating expense		15,450,000	12,487,000	11,626,000
Real Estate, Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		15,450,000	12,487,000	11,626,000
Expenses
Operating expense		15,450,000	12,487,000	11,626,000
Management Service [Member]
Revenue
Other revenue		28,056,000	27,697,000	29,641,000
Management Service [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		$ 28,056,000	$ 27,697,000	$ 29,641,000

[1] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income		$ 1,020,584	$ 631,932	$ 1,018,691
Other comprehensive income :
Effective portion of interest rate contracts		19,396	8,544	(7,848)
Amortization of interest rate contracts	[1]	6,707	6,704	6,697
Other comprehensive income (loss)		26,103	15,248	(1,151)
Comprehensive Income		1,046,687	647,180	1,017,540
Net income attributable to noncontrolling interests		(171,637)	(126,737)	(145,964)
Other comprehensive income attributable to noncontrolling interests		(3,156)	(2,020)	(404)
Comprehensive income attributable to the Company		871,894	518,423	871,172
Boston Properties Limited Partnership
Net income		1,032,122	641,771	1,038,739
Other comprehensive income :
Effective portion of interest rate contracts		19,396	8,544	(7,848)
Amortization of interest rate contracts	[2]	6,707	6,704	6,697
Other comprehensive income (loss)		26,103	15,248	(1,151)
Comprehensive Income		1,058,225	657,019	1,037,588
Net income attributable to noncontrolling interests		(75,433)	(71,382)	(48,836)
Comprehensive income attributable to the Company		$ 982,792	$ 585,637	$ 988,752

[1] Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties, Inc.’s Consolidated Statements of Operations

[2] Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties Limited Partnership’s Consolidated Statements of Operations.

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Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-In Capital [Member]	Dividends In Excess Of Earnings [Member]	Dividends In Excess Of Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling interest - property partnerships [Member]
Equity, shares at Dec. 31, 2019			154,790,000
Equity, value at Dec. 31, 2019	$ 8,014,236	$ (1,679)	$ 1,548	$ 200,000	$ 6,294,719	$ (760,523)	$ (1,505)	$ (2,722)	$ (48,335)	$ 600,860	$ (174)	$ 1,728,689
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List] | Accounting Standards Update 2018-09
Redemption of operating partnership units to common stock, shares			857,000
Redemption of operating partnership units to common stock, value	$ 0		$ 9		29,689					(29,698)
Allocated net income for the period	1,018,691					872,727				97,704		48,260
Dividends declared	(689,273)					(620,352)				(68,921)
Shares issued pursuant to stock purchase plan, shares			7,000
Shares issued pursuant to stock purchase plan, value	759				759
Net activity from stock option and incentive plan, shares			65,000
Net activity from stock option and incentive plan, value	48,621				9,303					39,318
Issuance of operating partnership units for 360 Park Avenue South	0
Preferred Stock Redemption Charge	0
Contributions from noncontrolling interests in property partnerships	8,219											8,219
Distributions to noncontrolling interests in property partnerships	(58,811)											(58,811)
Effective portion of interest rate contracts	(7,848)								(7,066)	(782)
Amortization of interest rate contracts	6,697								5,511	610		576
Reallocation of noncontrolling interest	0				22,321					(22,321)
Equity, shares at Dec. 31, 2020			155,719,000
Equity, value at Dec. 31, 2020	8,339,612		$ 1,557	200,000	6,356,791	(509,653)		(2,722)	(49,890)	616,596		1,726,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares			524,000
Redemption of operating partnership units to common stock, value	0		$ 5		18,381					(18,386)
Allocated net income for the period	631,932					505,195				55,931		70,806
Dividends declared	(683,843)					(615,021)				(68,822)
Shares issued pursuant to stock purchase plan, shares			9,000
Shares issued pursuant to stock purchase plan, value	1,004				1,004
Net activity from stock option and incentive plan, shares			293,000
Net activity from stock option and incentive plan, value	71,383		$ 3		25,607					45,773
Issuance of operating partnership units for 360 Park Avenue South	99,689									99,689
Preferred Stock, Redeemed	(193,623)			(200,000)	6,377
Preferred Stock Redemption Charge	(6,412)					(6,412)
Contributions from noncontrolling interests in property partnerships	18,002											18,002
Distributions to noncontrolling interests in property partnerships	(259,764)											(259,764)
Effective portion of interest rate contracts	8,544								7,703	841
Amortization of interest rate contracts	6,704								5,525	603		576
Reallocation of noncontrolling interest	$ 0				89,570					(89,570)
Equity, shares at Dec. 31, 2021	156,544,849		156,545,000
Equity, value at Dec. 31, 2021	$ 8,033,228		$ 1,565	0	6,497,730	(625,891)		(2,722)	(36,662)	642,655		1,556,553
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares			182,000
Redemption of operating partnership units to common stock, value	0		$ 3		6,536					(6,539)
Allocated net income for the period	1,020,584					848,947				96,780		74,857
Dividends declared	(686,126)					(614,412)				(71,714)
Shares issued pursuant to stock purchase plan, shares			10,000
Shares issued pursuant to stock purchase plan, value	1,036				1,036
Net activity from stock option and incentive plan, shares			21,000
Net activity from stock option and incentive plan, value	53,663				7,261					46,402
Issuance of operating partnership units for 360 Park Avenue South	0
Preferred Stock Redemption Charge	0
Contributions from noncontrolling interests in property partnerships	849											849
Distributions to noncontrolling interests in property partnerships	(85,518)											(85,518)
Effective portion of interest rate contracts	19,396								17,435	1,961
Amortization of interest rate contracts	6,707								5,509	622		576
Reallocation of noncontrolling interest	$ 0				26,584					(26,584)
Equity, shares at Dec. 31, 2022	156,757,867		156,758,000
Equity, value at Dec. 31, 2022	$ 8,363,819		$ 1,568	$ 0	$ 6,539,147	$ (391,356)		$ (2,722)	$ (13,718)	$ 683,583		$ 1,547,317

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Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Shares, Outstanding	156,757,867	156,544,849
Net activity from stock option and incentive plan, value	$ 53,663	$ 71,383	$ 48,621
Issuance of operating partnership units for 360 Park Avenue South	0	99,689	0
Preferred Stock Redemption Charge	0	(6,412)	0
Effective portion of interest rate contracts	19,396	8,544	(7,848)
Amortization of interest rate contracts	6,707	6,704	6,697
Contributions from noncontrolling interests in property partnerships	849	18,002	8,219
Distributions to noncontrolling interests in property partnerships	$ (85,518)	$ (259,764)	$ (58,811)
Accounting Standards Update 2018-09
Accounting Standards Update [Extensible List]				Accounting Standards Update 2014-09 [Member]
General Partner [Member]
Common Stock, Shares, Outstanding	1,750,000	1,746,000	1,731,000	1,727,000
Net activity from contributions and unearned compensation	1,000	5,000	1,000
Conversion of redeemable partnership units	3,000	10,000	3,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,008,000	154,799,000	153,988,000	153,063,000
Net activity from contributions and unearned compensation	30,000	295,000	72,000
Conversion of redeemable partnership units	179,000	516,000	853,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,299,428	$ 4,173,290	$ 4,554,639	$ 3,380,175
Net activity from contributions and unearned compensation, value	8,291	26,614	10,062
Allocated net income for the period	860,485	512,474	882,275
Distributions	(614,412)	(612,461)	(609,852)
Preferred Stock Redemption Charge		(6,412)
Conversion of redeemable partnership units, value	6,539	18,386	29,689
Adjustment to reflect redeemable partnership units at redemption value	865,235	(319,950)	863,795
Partners' Capital (General and Limited Partners)[Member] | Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance				(1,505)
Preferred Units [Member]
Beginning Balance	0	0	193,623	193,623
Allocated net income for the period		2,560	10,500
Distributions		(2,560)	(10,500)
Preferred Units [Member] | Boston Properties Limited Partnership
Preferred Stock, Redemption Amount		(193,623)
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(13,718)	(36,662)	(49,890)	(48,335)
Effective portion of interest rate contracts	17,435	7,703	(7,066)
Amortization of interest rate contracts	5,509	5,525	5,511
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,547,317	1,556,553	1,726,933	1,728,689
Allocated net income for the period	74,857	70,806	48,260
Amortization of interest rate contracts	576	576	576
Contributions from noncontrolling interests in property partnerships	849	18,002	8,219
Distributions to noncontrolling interests in property partnerships	(85,518)	(259,764)	(58,811)
Total Capital [Member]
Beginning Balance	6,833,027	5,693,181	6,425,305	5,254,152
Net activity from contributions and unearned compensation, value	8,291	26,614	10,062
Allocated net income for the period	935,342	585,840	941,035
Distributions	(614,412)	(615,021)	(620,352)
Preferred Stock, Redemption Amount		(193,623)
Preferred Stock Redemption Charge		(6,412)
Conversion of redeemable partnership units, value	6,539	18,386	29,689
Adjustment to reflect redeemable partnership units at redemption value	865,235	(319,950)	863,795
Effective portion of interest rate contracts	17,435	7,703	(7,066)
Amortization of interest rate contracts	6,085	6,101	6,087
Contributions from noncontrolling interests in property partnerships	849	18,002	8,219
Distributions to noncontrolling interests in property partnerships	(85,518)	(259,764)	(58,811)
Total Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance				(1,505)
Noncontrolling interest - Redeemable partnership units [Member]
Beginning Balance	1,280,886	2,078,603	1,643,024	2,468,753
Net activity from contributions and unearned compensation, value	46,408	45,773	39,318
Allocated net income for the period	96,780	55,931	97,704
Distributions	(71,714)	(68,822)	(68,921)
Issuance of operating partnership units for 360 Park Avenue South		99,689
Conversion of redeemable partnership units, value	(6,539)	(18,386)	(29,689)
Adjustment to reflect redeemable partnership units at redemption value	(865,235)	319,950	(863,795)
Effective portion of interest rate contracts	1,961	841	(782)
Amortization of interest rate contracts	$ 622	$ 603	$ 610
Noncontrolling interest - Redeemable partnership units [Member] | Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance				$ (174)

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Consolidated Statements Of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Net income	$ 1,020,584	$ 631,932	$ 1,018,691
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	749,775	717,336	683,751
Amortization of right of use assets - operating leases	2,427	3,516	2,234
Non-cash compensation expense	52,026	50,860	44,142
Loss from unconsolidated joint ventures	59,840	2,570	85,110
Distributions of net cash flow from operations of unconsolidated joint ventures	26,827	21,542	31,892
Losses (gains) from investments in securities	6,453	(5,626)	(5,261)
Allowance for current expected credit losses	(224)	(1,207)	1,849
Non-cash portion of interest expense	25,831	23,368	23,384
Settlement of accreted debt discount on redemption of unsecured senior notes	0	(8,500)	0
Losses from early extinguishment of debt	0	45,182	0
Other Income - assignment fee	6,624	0	0
Gains on sales of real estate	(437,019)	(123,660)	(618,982)
Gain on sales-type lease	(10,058)	0	0
Unrealized loss on non-real estate investment	150	0	0
Change in assets and liabilities:
Tenant and other receivables, net	(7,621)	4,820	22,550
Notes receivable, net	(152)	(545)	(19)
Accrued rental income, net	(98,075)	(101,548)	(97,099)
Prepaid expenses and other assets	20,099	(20,811)	12,488
Lease liabilities - finance leases	0	0	568
Lease liabilities - operating leases	125	(23,599)	1,533
Accounts payable and accrued expenses	(22,777)	20,025	(4,059)
Accrued interest payable	8,989	(10,839)	16,211
Other liabilities	(24,120)	(28,739)	17,629
Tenant leasing costs	(84,057)	(62,850)	(79,772)
Total adjustments	261,815	501,295	138,149
Net cash provided by operating activities	1,282,399	1,133,227	1,156,840
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)	(222,260)	(137,976)
Construction in progress	(500,273)	(513,878)	(482,507)
Building and other capital improvements	(177,004)	(150,998)	(160,126)
Tenant improvements	(218,685)	(263,952)	(234,423)
Proceeds from sales of real estate	834,770	179,887	519,303
Proceeds from assignment fee	6,624	0	0
Capital contributions to unconsolidated joint ventures	(277,581)	(98,152)	(172,436)
Capital distributions from unconsolidated joint ventures	37,122	122	55,298
Proceeds from sale of investment in unconsolidated joint venture	0	17,789	0
Investments in non-real estate investments	(2,404)	0	0
Issuance of notes receivable, net	0	0	(9,800)
Proceeds from note receivable	10,000	10,035	6,397
Investments in securities, net	4,902	1,451	2,551
Net cash used in investing activities	(1,602,802)	(1,039,956)	(613,719)
Cash flows from financing activities:
Proceeds from Secured Notes Payable	0	1,201,388	0
Repayments of mortgage notes payable	0	(832,296)	(17,168)
Proceeds from unsecured senior notes	749,557	1,695,996	1,248,125
Redemption of unsecured senior notes	0	(1,841,500)	0
Borrowings on unsecured line of credit	985,000	770,000	265,000
Repayments of unsecured line of credit	(1,130,000)	(625,000)	(265,000)
Borrowings on unsecured term loan	730,000	0	0
Redemption of preferred stock	0	(200,000)	0
Payments on finance lease obligations	0	1,250	0
Repayment of unsecured term loan	0	(500,000)	0
Deferred financing costs	(8,460)	(20,757)	(10,416)
Debt Issuance Costs	0	(16,186)	0
Debt prepayment and extinguishment costs	0	(43,036)	0
Net activity from equity transactions	(352)	24,214	3,277
Dividends and distributions	(685,019)	(683,753)	(688,904)
Contributions from noncontrolling interests in property partnerships	849	18,002	8,219
Distributions to noncontrolling interests in property partnerships	(85,518)	(259,764)	(58,811)
Net cash provided by (used in) financing activities	556,057	(1,311,442)	484,322
Net increase (decrease) in cash and cash equivalents and cash held in escrows	235,654	(1,218,171)	1,027,443
Cash and cash equivalents and cash held in escrows, beginning of period	501,158	1,719,329	691,886
Cash and cash equivalents and cash held in escrows, end of period	736,812	501,158	1,719,329
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	452,692	1,668,742	644,950
Cash held in escrows, beginning of period	48,466	50,587	46,936
Cash and cash equivalents, end of period	690,333	452,692	1,668,742
Cash held in escrows,end of period	46,479	48,466	50,587
Supplemental disclosures:
Cash paid for interest	449,903	465,442	433,492
Interest capitalized	52,130	53,097	53,881
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(119,534)	(239,317)	(99,494)
Change in real estate included in accounts payable and accrued expenses	97,586	(25,183)	(19,848)
Construction in progress, net deconsolidated	(11,316)	(299,947)	0
Investment in unconsolidated joint ventures recorded upon deconsolidation	11,316	107,132	347,898
Sales-type lease origination	13,045	0	0
Derecognition of assets in exchange for sales-type lease obligation	(2,987)	0	0
Accrued rental income, net deconsolidated	0	0	(4,558)
Tenant leasing costs, net deconsolidated	0	0	(3,462)
Building and other capital improvements, net deconsolidated	0	0	(111,889)
Tenant improvements, net deconsolidated	0	0	(12,331)
Prepaid expenses and other assets, net deconsolidated	0	(5,011)	0
Assumption of mortgage notes payable	0	200,311	0
Mortgage notes payable, net deconsolidation	0	(198,381)	0
Issuance of operating partnership units	0	99,689	0
Right-of-use assets obtained in exchange for lease liabilities	0	26,887	0
Dividends and distributions declared but not paid	170,643	169,859	171,082
Conversions of noncontrolling interests to stockholders’ equity	6,539	18,386	29,698
Issuance of restricted securities to employees and non-employee directors	48,417	44,405	42,607
Boston Properties Limited Partnership
Net income	1,032,122	641,771	1,038,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	742,293	709,035	676,666
Amortization of right of use assets - operating leases	2,427	3,516	2,234
Non-cash compensation expense	52,026	50,860	44,142
Loss from unconsolidated joint ventures	59,840	2,570	85,110
Distributions of net cash flow from operations of unconsolidated joint ventures	26,827	21,542	31,892
Losses (gains) from investments in securities	6,453	(5,626)	(5,261)
Allowance for current expected credit losses	(224)	(1,207)	1,849
Non-cash portion of interest expense	25,831	23,368	23,384
Settlement of accreted debt discount on redemption of unsecured senior notes	0	(8,500)	0
Losses from early extinguishment of debt	0	45,182	0
Other Income - assignment fee	6,624	0	0
Gains on sales of real estate	(441,075)	(125,198)	(631,945)
Gain on sales-type lease	(10,058)	0	0
Unrealized loss on non-real estate investment	150	0	0
Change in assets and liabilities:
Tenant and other receivables, net	(7,621)	4,820	22,550
Notes receivable, net	(152)	(545)	(19)
Accrued rental income, net	(98,075)	(101,548)	(97,099)
Prepaid expenses and other assets	20,099	(20,811)	12,488
Lease liabilities - finance leases	0	0	568
Lease liabilities - operating leases	125	(23,599)	1,533
Accounts payable and accrued expenses	(22,777)	20,025	(4,059)
Accrued interest payable	8,989	(10,839)	16,211
Other liabilities	(24,120)	(28,739)	17,629
Tenant leasing costs	(84,057)	(62,850)	(79,772)
Total adjustments	250,277	491,456	118,101
Net cash provided by operating activities	1,282,399	1,133,227	1,156,840
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)	(222,260)	(137,976)
Construction in progress	(500,273)	(513,878)	(482,507)
Building and other capital improvements	(177,004)	(150,998)	(160,126)
Tenant improvements	(218,685)	(263,952)	(234,423)
Proceeds from sales of real estate	834,770	179,887	519,303
Proceeds from assignment fee	6,624	0	0
Capital contributions to unconsolidated joint ventures	(277,581)	(98,152)	(172,436)
Capital distributions from unconsolidated joint ventures	37,122	122	55,298
Proceeds from sale of investment in unconsolidated joint venture	0	17,789	0
Investments in non-real estate investments	(2,404)	0	0
Issuance of notes receivable, net	0	0	(9,800)
Proceeds from note receivable	10,000	10,035	6,397
Investments in securities, net	4,902	1,451	2,551
Net cash used in investing activities	(1,602,802)	(1,039,956)	(613,719)
Cash flows from financing activities:
Proceeds from Secured Notes Payable	0	1,201,388	0
Repayments of mortgage notes payable	0	(832,296)	(17,168)
Proceeds from unsecured senior notes	749,557	1,695,996	1,248,125
Redemption of unsecured senior notes	0	(1,841,500)	0
Borrowings on unsecured line of credit	985,000	770,000	265,000
Repayments of unsecured line of credit	(1,130,000)	(625,000)	(265,000)
Borrowings on unsecured term loan	730,000	0	0
Redemption of preferred stock	0	(200,000)	0
Payments on finance lease obligations	0	1,250	0
Repayment of unsecured term loan	0	(500,000)	0
Deferred financing costs	(8,460)	(20,757)	(10,416)
Debt Issuance Costs	0	(16,186)	0
Debt prepayment and extinguishment costs	0	(43,036)	0
Net activity from equity transactions	(352)	24,214	3,277
Dividends and distributions	(685,019)	(683,753)	(688,904)
Contributions from noncontrolling interests in property partnerships	849	18,002	8,219
Distributions to noncontrolling interests in property partnerships	(85,518)	(259,764)	(58,811)
Net cash provided by (used in) financing activities	556,057	(1,311,442)	484,322
Net increase (decrease) in cash and cash equivalents and cash held in escrows	235,654	(1,218,171)	1,027,443
Cash and cash equivalents and cash held in escrows, beginning of period	501,158	1,719,329	691,886
Cash and cash equivalents and cash held in escrows, end of period	736,812	501,158	1,719,329
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	452,692	1,668,742	644,950
Cash held in escrows, beginning of period	48,466	50,587	46,936
Cash and cash equivalents, end of period	690,333	452,692	1,668,742
Cash held in escrows,end of period	46,479	48,466	50,587
Supplemental disclosures:
Cash paid for interest	449,903	465,442	433,492
Interest capitalized	52,130	53,097	53,881
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(119,534)	(238,003)	(99,494)
Change in real estate included in accounts payable and accrued expenses	97,586	(25,183)	(19,848)
Construction in progress, net deconsolidated	(11,316)	(299,947)	0
Investment in unconsolidated joint ventures recorded upon deconsolidation	11,316	107,132	347,898
Sales-type lease origination	13,045	0	0
Derecognition of assets in exchange for sales-type lease obligation	(2,987)	0	0
Accrued rental income, net deconsolidated	0	0	(4,558)
Tenant leasing costs, net deconsolidated	0	0	(3,462)
Building and other capital improvements, net deconsolidated	0	0	(111,889)
Tenant improvements, net deconsolidated	0	0	(12,331)
Prepaid expenses and other assets, net deconsolidated	0	(5,011)	0
Assumption of mortgage notes payable	0	200,311	0
Mortgage notes payable, net deconsolidation	0	(198,381)	0
Issuance of operating partnership units	0	99,689	0
Right-of-use assets obtained in exchange for operating lease liabilities	0	26,887	0
Dividends and distributions declared but not paid	170,643	169,859	171,082
Conversions of noncontrolling interests to stockholders’ equity	6,539	18,386	29,698
Issuance of restricted securities to employees and non-employee directors	$ 48,417	$ 44,405	$ 42,607

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Organization

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

1. Organization

BXP is a fully integrated, self-administered and self-managed REIT. BXP is the sole general partner of BPLP, its operating partnership, and at December 31, 2022 owned an approximate 89.6% (89.7% at December 31, 2021) general and limited partnership interest in BPLP. Unless stated otherwise or the context requires, the “Company” refers to BXP and its subsidiaries, including BPLP and its consolidated subsidiaries. Partnership interests in BPLP include:

•common units of partnership interest (also referred to as “OP Units”) and

•long term incentive units of partnership interest (also referred to as “LTIP Units”)

Unless specifically noted otherwise, all references to OP Units exclude units held by BXP. A holder of an OP Unit may present the OP Unit to BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, BPLP is obligated to redeem the OP Unit for cash equal to the value of a share of common stock of BXP (“Common Stock”). In lieu of such cash redemption, BXP may elect to acquire the OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that BXP owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock.

The Company uses LTIP Units as a form of time-based, restricted equity compensation and as a form of performance-based equity compensation for employees, and has previously granted LTIP Units in the form of (1) 2012 outperformance plan awards (“2012 OPP Units”) and (2) 2013 - 2022 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), each of which, upon the satisfaction of certain performance-based and time-based vesting conditions, is convertible into one OP Unit. The three-year measurement periods for the 2012 OPP Units and the 2013 - 2019 MYLTIP Units have ended and BXP’s total stockholder return (“TSR”) was sufficient for employees to earn and therefore become eligible to vest in a portion of the awards. Unless and until they are earned, the rights, preferences and privileges of the 2020 - 2022 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2019 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2020 - 2022 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2019 MYLTIP Units), whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Notes 9, 14 and 16).

Properties

At December 31, 2022, the Company owned or had joint venture interests in a portfolio of 194 commercial real estate properties (the “Properties”) aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.2 million net rentable square feet. At December 31, 2022, the Properties consisted of:

•173 office and life sciences properties (including 10 properties under construction/redevelopment);

•14 retail properties (including two properties under construction/redevelopment);

•six residential properties (including one property under construction); and

•one hotel.

The Company considers premier workplaces to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and professionally managed and maintained. As such, these properties attract high-quality tenants and command upper-tier rental rates.

All references to acres and square footage in the Notes are unaudited.

Basis of Presentation

The accompanying consolidated financial statements are presented using the accrual basis of accounting in conformity with accounting principles generally accepted in the United States of America. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its

own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving securities of BXP. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIEs”) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.

Variable Interest Entities (VIEs)

Consolidated VIEs are those for which the Company is considered to be the primary beneficiary of a VIE. The primary beneficiary is the entity that has a controlling financial interest in the VIE, which is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and (2) the obligation to absorb losses or the right to receive the returns from the VIE that could potentially be significant to the VIE. The assets of each VIE are only available to satisfy such VIE's respective liabilities. The Company has determined that it is the primary beneficiary for six of the seven entities that are VIEs as of December 31, 2022.

Consolidated Variable Interest Entities

As of December 31, 2022, BXP has identified six consolidated VIEs, including BPLP. Excluding BPLP, the VIEs consisted of the following five in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street.

The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities (excluding BPLP’s interest) are reflected as noncontrolling interests in property partnerships in the accompanying consolidated financial statements (See Note 9). 

In addition, BXP’s only significant asset is its investment in BPLP and, consequently, substantially all of BXP’s assets and liabilities are the assets and liabilities of BPLP.

Variable Interest Entities Not Consolidated

As of December 31, 2022, the Company has determined that the Platform 16 Holdings LP joint venture is a VIE. The Company does not consolidate this entity as the Company does not have the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and, therefore, the Company is not considered to be the primary beneficiary.

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Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Real Estate 

Upon acquisitions of real estate, the Company assesses whether the transaction should be accounted for as an asset acquisition or as a business combination by applying a screen to determine whether the integrated set of assets and activities acquired meets the definition of a business. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. The Company’s acquisitions of real estate or in-substance real estate generally will not meet the definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e. land, buildings, and related intangible assets) or because the acquisition does not include a substantive process in the form of an acquired workforce or an acquired contract that cannot be replaced without significant cost, effort or delay.

The Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenants’ credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company’s allocation to customer relationship intangible assets has been immaterial. 

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company’s Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company’s evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses. 

Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. The evaluation of anticipated cash flows is subjective and is based in part on assumptions regarding anticipated hold periods, future occupancy, future rental rates, future capital requirements, discount rates and capitalization rates that could differ materially from actual results in future periods. Because cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset may be impaired, the Company’s established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company’s hold strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized, and such loss could be material. If the Company determines that an impairment has occurred, the affected assets must be reduced to their fair value. 

Guidance in Accounting Standards Codification (“ASC”) 360 “Property Plant and Equipment” requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. Discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). The components of the property’s net income that are reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by BXP’s Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that a sale of the property within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company capitalizes acquisition costs that it incurs to effect an asset acquisition and expenses acquisition costs that it incurs to effect a business combination, including legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific

component of the project that benefited from the investment. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. The Company’s capitalization policy on development properties follows the guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate-General.” The costs of land and buildings under development include specifically identifiable costs.

Capitalized costs include pre-construction costs necessary to the development of the property, development costs (including architectural, engineering and design costs), construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary for the development of the property. The Company considers a construction project as substantially complete and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed, (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction or (3) if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $52.1 million, $53.1 million and $53.9 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $16.1 million, $13.7 million and $12.9 million, respectively. 

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period. 

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. The Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations. 

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents 

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000.

Cash Held in Escrows

Escrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs. Escrows also include cash held by qualified intermediaries for possible investments in like-kind exchanges in accordance with Section 1031 of the Internal Revenue Code, as amended (the “Code”), in connection with sales of the Company’s properties. 

Investments in Securities 

The Company accounts for investments in equity securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The Company maintains deferred compensation plans that are designed to allow officers and non-employee directors of BXP to defer a portion of the officer’s current income or the non-employee director’s current compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer or non-employee director. The Company’s obligation under the plans is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2022 and 2021, the Company had maintained approximately $32.3 million and $43.6 million, respectively, in separate accounts, which are not restricted as to their use. The Company recognized gains (losses) of approximately $(6.5) million, $5.6 million and $5.3 million on its investments in the

accounts associated with the Company’s deferred compensation plans during the years ended December 31, 2022, 2021 and 2020, respectively.

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Notes Receivable

The Company accounts for notes receivable at their unamortized cost, net of any unamortized deferred fees or costs, premiums or discounts and an allowance for loan losses. Loan fees and direct costs associated with loans originated by the Company are deferred and amortized over the term of the note as interest income. 

Deferred Charges

Deferred charges include leasing costs and certain financing fees. Leasing costs include acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Unamortized leasing costs are charged to expense upon the early termination of the lease. Fully amortized deferred leasing costs are removed from the books upon the expiration of the lease. Financing fees included in deferred charges consist of external fees and costs incurred to obtain the Company’s revolving facility and if applicable, unsecured term loan and construction financing arrangements where there are not sufficient amounts outstanding to report the fees net of the debt liability. Such financing costs have been deferred and are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing. Fully amortized deferred financing costs are removed from the books upon the maturity of the debt.

External fees and costs incurred to obtain mortgage financings and unsecured senior notes have been deferred and are presented as direct deductions from the carrying amounts of the corresponding debt liability. Such financing costs are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing.

Non-Real Estate Investments

The Company measures its investments in non-real estate investments, which are primarily environmentally focused investment funds, at the readily determinable fair value of the investment. Changes in the fair value of these non-real estate investments are included in unrealized gain (loss) on non-real estate investments on the Consolidated Statements of Operations. The Company’s investment in non-real estate investments is shown within Prepaid and Other Assets in the Consolidated Balance Sheet. The Company recognized a net unrealized loss of approximately $0.2 million for the year ended December 31, 2022 due to the observable changes in fair value. Prior to the year ended December 31, 2022, the Company had not invested in non-real estate investments.

Investments in Unconsolidated Joint Ventures 

The Company consolidates VIEs in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have substantive participating rights. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance, and (2) the obligation to absorb losses and the right to receive the returns from the variable interest entity that could potentially be significant to the VIE. For ventures that are not VIEs, the Company consolidates entities for which it has significant decision making control over the ventures’ operations. The Company’s judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company’s ownership interest, its representation in the entity’s governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company’s assessment of its influence or control over an entity affects the presentation of these investments in the Company’s consolidated financial statements. In addition to evaluating control rights,

the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member. 

Accounts of the consolidated entity are included in the accounts of the Company and the noncontrolling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company’s share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company’s recognition of joint venture income or loss generally follows the joint venture’s distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company classifies distributions received from equity method investees within its Consolidated Statements of Cash Flows using the nature of the distribution approach, which classifies the distributions received on the basis of the nature of the activity or activities of the investee that generated the distribution as either a return on investment (classified as cash inflows from operating activities) or a return of investment (classified as cash inflows from investing activities). The Company’s investments in unconsolidated joint ventures are reviewed for indicators of impairment on a quarterly basis and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. The Company will record an impairment charge if it determines that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value is calculated using discounted cash flows which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, debt interest rates and availability, discount rates and capitalization rates that could differ materially from actual results in future periods.

To the extent that the Company contributed assets to a joint venture, the Company’s investment in the joint venture was recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 610-20 “Gains and Losses from the Derecognition of Nonfinancial Assets” (“ASC 610-20”), the Company will recognize a full gain on both the retained and sold portions of real estate contributed or sold to a joint venture by recognizing its new equity method investment interest at fair value.

The combined summarized financial information of the unconsolidated joint ventures is disclosed in Note 6. 

Revenue Recognition

In general, the Company commences lease/rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. Contractual lease/rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $108.0 million, $104.3 million and $104.9 million for the years ended December 31, 2022, 2021 and 2020, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative lease/rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements.

The Company must estimate the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of tenants’ accrued rent and accounts receivable balances, management considers tenants’ creditworthiness, current economic trends and changes in tenants’ payment patterns, on a lease-by-lease basis. The Company writes-off the tenant’s receivable balance, including the accrued rent receivable, if the Company considers the balances no longer probable of collection. In addition, tenants in bankruptcy are analyzed and considerations are made in connection with the expected recovery of pre-petition and post-petition claims. If the Company deems the balances no longer probable of collection, the Company writes

them off and ceases recognizing lease income, including straight-line rent, unless cash is received (See Note 4). Following a write-off, if (1) the Company subsequently determines that it is probable it will collect substantially all the remaining lessee’s lease payments under the lease term and (2) the lease has not been modified since the write-off, the Company will then reinstate the accrued rent and accounts receivable write-offs, adjusting for the amount related to the period when the lease payments were considered not probable of collection. If the Company’s estimates of collectability differs from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

The Company recognizes acquired in-place “above-” and “below-market” leases at their fair values as rental revenue over the original term of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $9.1 million, $4.2 million and $6.5 million for the years ended December 31, 2022, 2021 and 2020, respectively. The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2023	$	1,306	$	13,439
2024	401		9,811
2025	389		9,768
2026	389		8,647
2027	389		5,477

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred (See “Leases” ). The Company receives reimbursements of payroll and payroll related costs from unconsolidated joint venture entities and third party property owners in connection with management services contracts which the Company reflects on a gross basis instead of on a net basis as the Company has determined that it is the principal and not the agent under these arrangements in accordance with the guidance in ASC 606 “Revenue from Contracts with Customers” (“ASC 606”).

The Company’s parking revenue is derived primarily from monthly and transient daily parking. In addition, the Company has certain lease arrangements for parking accounted for under the guidance in ASC 842 “Leases” (“ASC 842”). The monthly and transient daily parking revenue falls within the scope of ASC 606 and is accounted for at the point in time when control of the goods or services transfers to the customer and the Company’s performance obligation is satisfied.

The Company’s hotel revenue is derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenue is recognized as the hotel rooms are occupied and the services are rendered to the hotel customers.

The Company earns management and development fees. Development and management services revenue is earned from unconsolidated joint venture entities and third-party property owners. The Company determined that the performance obligations associated with its development services contracts are satisfied over time and that the Company would recognize its development services revenue under the output method evenly over time from the development commencement date through the substantial completion date of the development management services project due to the stand-ready nature of the contracts. Significant judgments impacting the amount and timing of revenue recognized from the Company’s development services contracts include estimates of total development project costs from which the fees are typically derived and estimates of the period of time until substantial completion of the development project, the period of time over which the development services are required to be performed. The Company recognizes development fees earned from unconsolidated joint venture projects equal to its cost plus profit to the extent of the third party partners’ ownership interest. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 610-20. Under ASC 610-20, the Company must first determine whether the transaction is a sale to a customer or non-customer. The

Company typically sells real estate on a selective basis and not within the ordinary course of its business and therefore expects that its sale transactions will not be contracts with customers. The Company next determines whether it has a controlling financial interest in the property after the sale, consistent with the consolidation model in ASC 810 “Consolidation” (“ASC 810”). If the Company determines that it does not have a controlling financial interest in the real estate, it evaluates whether a contract exists under ASC 606 and whether the buyer has obtained control of the asset that was sold. The Company recognizes a full gain on sale of real estate when the derecognition criteria under ASC 610-20 have been met.

Leases 

Lessee

For leases in which the Company is the lessee (generally ground leases), in accordance with ASC 842 the Company recognizes a right-of-use asset and a lease liability. The Company made the policy election to not apply the requirements of ASC 842 to short-term leases. This policy election is made by class of underlying assets and as described below, the Company considers real estate to be a class of underlying assets, and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature. The Company will recognize the lease payments it pays in net income on a straight-line basis over the lease term.

The lease liability is equal to the present value of the minimum lease payments in accordance with ASC 842. The Company will use its incremental borrowing rate (“IBR”) to determine the net present value of the minimum lease payments. In order to determine the IBR, the Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. The approach required significant judgment. Therefore, the Company utilized different data sets to estimate base IBRs via an analysis of the following weighted-components:

•the interpolated rates from yields on outstanding U.S. Treasury issuances for up to 30 years and for years 31 and beyond, longer-term publicly traded educational institution debt issued by high credit quality educational institutions with maturity dates exceeding 31 years,

•observable mortgage rates spread over U.S. Treasury issuances, and

•unlevered property yields and discount rates.

The Company then applied adjustments to account for considerations related to term and interpolated the IBR.

Lessor

Operating Leases

The Company leases primarily premier workplaces, including office, life sciences, retail and residential space to tenants. These leases may contain extension and termination options that are predominately at the sole discretion of the tenant, provided certain conditions are satisfied. In a few instances, the leases also contain purchase options, which would be exercisable at fair market value. Also, certain of the Company’s leases include rental payments that are based on a percentage of the tenant sales in excess of contractual amounts.

Per ASC 842, lessors do not need to separate nonlease components from the associated lease component if certain criteria stated above are met for each class of underlying assets. The guidance in ASC 842 defines “underlying asset” as “an asset that is the subject of a lease for which a right to use that asset has been conveyed to a lessee. The underlying asset could be a physically distinct portion of a single asset.” Based on the above guidance, the Company considers real estate assets as a class of underlying assets and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature.

Lease components are elements of an arrangement that provide the customer with the right to use an identified asset. Nonlease components are distinct elements of a contract that are not related to securing the use of the leased asset and revenue is recognized in accordance with ASC 606. The Company considers common area maintenance (CAM) and service income associated with tenant work orders to be nonlease components because they represent delivery of a separate service but are not considered a cost of securing the identified asset. In the case of the Company’s business, the identified asset would be the leased real estate (office, life sciences, retail or residential).

The Company assessed and concluded that the timing and pattern of transfer for nonlease components and the associated lease component are the same. The Company determined that the predominant component was the lease component and as such its leases will continue to qualify as operating leases and the Company has made a

policy election to account for and present the lease component and the nonlease component as a single component in the revenue section of the Consolidated Statements of Operations labeled Lease.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred. The Company recognizes these reimbursements on a gross basis, as the Company obtains control of the goods and services before they are transferred to the tenant.

In addition, in accordance with ASC 842, lessors will only capitalize incremental direct leasing costs.

Sales-Type Leases

Sales-type lease receivables are recognized when a lease qualifies as a sales-type lease. The sales-type lease receivable is initially measured at the present value of the fixed and determinable lease payments, including any guaranteed or unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease. The Company evaluates its sales-type lease receivable for impairment under the current expected credit loss standard. Interest income is recognized under the effective interest method. The effective interest method produces a constant yield on the sales-type lease receivable over the term of the lease. Income from these leases are classified as Lease Revenue within the Consolidated Statement of Operations.

Earnings Per Share 

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of BPLP that are exchangeable for Common Stock.

Earnings Per Common Unit

Basic earnings per common unit is computed by dividing net income available to common unitholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of common units outstanding during the year. Diluted earnings per common unit reflects the potential dilution that could occur from units issuable in connection with awards under BXP’s stock-based compensation plans, including upon the exercise of stock options, and conversion of preferred units of BPLP.

Recurring Fair Value of Financial Instruments

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for December 31, 2022 and 2021, the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Sales-type lease receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading volume for the period is low, the valuation could be categorized as Level 2.

Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from those estimates.

In addition, the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.

The following table presents the aggregate carrying value of the Company’s related party note receivable, net, notes receivable, net, sales-type lease receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,576	$	79,220	$	78,336	$	82,867
Note receivable, net	—		—		9,641		10,000
Sales-type lease receivable, net	12,811		13,045		—		—
Total	$	91,387	$	92,265	$	87,977	$	92,867
Mortgage notes payable, net	$	3,272,368	$	2,744,479	$	3,267,914	$	3,395,569
Unsecured senior notes, net	10,237,968		9,135,512		9,483,695		9,966,591
Unsecured line of credit	—		—		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	14,240,336	$	12,609,991	$	12,896,609	$	13,507,477

The Company uses interest rate swap agreements to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. The Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the Consolidated Balance Sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for both the effective and ineffective portions of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the fair value of the derivative to earnings over the term that the hedged transaction affects earnings and in the same line item as the hedged transaction within the statements of operations.

During the year ended December 31, 2020, the Company elected to apply hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. The Company’s application of this expedient preserves the presentation of derivatives consistent with past presentation.

Stock-Based Employee Compensation Plans

At December 31, 2022, the Company had a stock-based employee compensation plan. The Company accounts for the plan under the guidance in ASC 718 “Compensation – Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as COVID-19, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.

BXP

Equity Offering Costs 

Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital. 

Treasury Stock 

BXP’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity. 

Dividends 

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation. 

The tax treatment of common dividends per share for federal income tax purposes is as follows: 

	For the year ended December 31,
	2022					2021					2020
	Per Share			%		Per Share			%		Per Share			%
Ordinary income	$	3.42		86.60	%	$	2.90		73.86	%	$	2.52		64.91	%
Capital gain income	0.53			13.40	%	0.57			14.57	%	0.99			25.49	%
Return of capital	—			—	%	0.45			11.57	%	0.37			9.60	%
Total	$	3.95	(1)	100.00	%	$	3.92	(2)	100.00	%	$	3.88	(3)	100.00	%

 _____________

(1)The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.

(2)The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.

(3)The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.

Income Taxes 

BXP has elected to be treated as a REIT under Sections 856 through 860 of the Code, commencing with its taxable year ended December 31, 1997. As a result, it generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income (with certain adjustments). BXP’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BXP’s consolidated taxable REIT subsidiaries. BXP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BXP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BXP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

The Company owns a hotel property that it leases to one of its taxable REIT subsidiaries and that is managed by Marriott International, Inc. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, if applicable, BXP has recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020. 

Certain entities included in BXP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements. 

BPLP

Income Taxes 

The partners are required to report their respective share of BPLP’s taxable income or loss on their respective tax returns and are liable for any related taxes thereon. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BPLP’s consolidated taxable REIT subsidiaries. BPLP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BPLP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BPLP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, BPLP has, if applicable, recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020.

Certain entities included in BPLP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

XML

Real Estate

12 Months Ended

Dec. 31, 2022

Real Estate [Abstract]

Real Estate

3. Real Estate

BXP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,189,811	$	5,061,169
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,820,724		14,291,214
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,794,524		24,159,915
Less: Accumulated depreciation	(6,298,082)		(5,883,961)
	$	19,496,442	$	18,275,954

_______________

(1)Includes pre-development costs.

BPLP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,095,102	$	4,964,986
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,547,919		14,014,010
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,427,010		23,786,528
Less: Accumulated depreciation	(6,180,474)		(5,772,018)
	$	19,246,536	$	18,014,510

_______________

(1)Includes pre-development costs.

Acquisitions

On May 17, 2022, the Company completed the acquisition of Madison Centre in Seattle, Washington for a net purchase price, including transaction costs, of approximately $724.3 million. The acquisition was completed using the proceeds from BPLP’s $730.0 million unsecured term loan (See Note 7). Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace. The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

On September 16, 2022, the Company acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property. The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre and 125 Broadway as of their acquisition dates for each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles	Acquired Above-Market Lease Intangibles	Acquired Below-Market Lease Intangible
2023	20,940	1,098	6,417
2024	19,582	254	6,386
2025	19,510	254	6,373
2026	19,046	254	6,185
2027	17,901	254	5,780

125 Broadway contributed approximately $11.4 million of revenue and approximately $3.3 million of net income to the Company for the period from September 16, 2022 through December 31, 2022. Madison Centre contributed approximately $32.0 million of revenue and approximately $2.1 million of net income to the Company for the period from May 17, 2022 through December 31, 2022.

Dispositions

On March 31, 2022, the Company completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property. 195 West Street contributed approximately $0.4 million of net income to the Company from January 1, 2022 through March 30, 2022 and contributed approximately $0.5 million and $(0.8) million of net income (loss) to the Company for the years ended December 31, 2021 and 2020, respectively.

On April 19, 2021, the Company entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, the Company executed an agreement to assign its right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and are reflected as Other income - assignment fee in the Company's Consolidated Statements of Operations. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

On June 15, 2022, the Company completed the sale of its suburban Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet. Virginia 95 Office Park contributed approximately $2.3 million of net income to the Company from January 1, 2022 through June 14, 2022 and contributed approximately $7.0 million and $7.8 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

On August 30, 2022, the Company completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace. 601 Massachusetts Avenue contributed approximately $14.9 million of net income to the Company for the period from January 1, 2022 through August 29, 2022, respectively, and contributed approximately $22.4 million and $21.8 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

On September 15, 2022, the Company completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

On November 8, 2022, the Company completed the sale of the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141.0 million. Net cash proceeds totaled approximately $139.6 million, resulting in a gain on sale of real estate of approximately $55.6 million for BXP and BPLP. The Avant at Reston Town Center is a 15-story, 359-unit, luxury multifamily building consisting of approximately 329,000 net rentable square feet, excluding retail space. The Company retained ownership of the approximately 26,000 square foot ground-level retail space. The Avant at Reston Town Center contributed approximately $4.1 million of net income to the Company for the period from January 1, 2022 through November 7, 2022, respectively, and contributed approximately $4.0 million and $4.0 million of net income to the Company for the years ended December 31, 2021 and 2020, respectively.

Developments/Redevelopments

On April 27, 2022, the Company entered into a 15-year lease agreement with AstraZeneca for approximately 566,000 net rentable square feet at the Company’s 290 Binney Street future development project. 290 Binney Street is part of the initial phase of a future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. The full project is expected to consist of two buildings aggregating approximately 1.1 million rentable square feet of life sciences space and an approximately 400,000 square foot residential building (See Note 16).

On April 29, 2022, the Company partially placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC.

On May 13, 2022, the Company commenced the development of Reston Next Office Phase II, a premier workplace project located in Reston, Virginia. When completed, the building will consist of approximately 90,000 net rentable square feet.

On June 29, 2022, the Company completed and fully placed in-service 325 Main Street, a premier workplace project with approximately 414,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2022, the Company commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet.

On September 8, 2022, the Company terminated its existing lease agreement with its tenant at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space (See Note 16).

On September 12, 2022, the Company commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet.

On October 19, 2022, the Company completed and fully placed in-service Reston Next, a premier workplace project consisting of two buildings with an aggregate of approximately 1.1 million net rentable square feet, located in Reston, Virginia.

On November 30, 2022, the Company commenced the redevelopment of 105 Carnegie Center, located in Princeton, New Jersey. The redevelopment is a repositioning of the property. 105 Carnegie Center consisted of approximately 70,000 net rentable square feet of office space. When completed, the building will consist of approximately 73,000 net rentable square feet of laboratory/life sciences space.

On December 1, 2022, the Company removed 2096 Gaither Road from its in-service portfolio following the expiration of the last leases on November 30, 2022. 2096 Gaither Road consisted of approximately 50,000 net rentable square feet of office space in the Company’s Shady Grove Innovation District, located in Rockville, Maryland. The Company anticipates it will redevelop or convert 2096 Gaither Road to support lab or life sciences-related uses.

On December 23, 2022, the Company completed and fully placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts.

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Leases

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Leases of Lessor Disclosure [Text Block]

4. Leases

The Company estimates the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of these accrued rent and accounts receivable balances, management considers tenant creditworthiness, current economic trends and changes in tenants’ payment patterns, on a lease-by-lease basis. During the years ended December 31, 2021 and 2020, the Company wrote off approximately $1.3 million and $90.3 million, respectively, related to accrued rent, net balances and accounts receivable, net balances. The write-offs were for tenants, primarily in the retail and co-working sectors, that either terminated their leases or for which the Company determined their accrued rent and/or accounts receivable balances were no longer probable of collection.

In April 2020, the FASB staff issued a question and answer document (“Lease Modification Q & A”) related to the application of lease accounting guidance for lease concessions, in accordance with ASC 842, as a result of COVID-19. The Company did not utilize the guidance provided in the Lease Modification Q & A and instead elected to continue to account for the COVID-19 lease concessions on a lease-by-lease basis in accordance with the existing lease modification accounting framework.

During the year ended December 31, 2022, the Company determined it was probable of collecting

substantially all of certain clients’ accrued rent and account receivable balances and, therefore, ceased recognizing

revenue from such clients on a cash basis. As a result of returning these clients to accrual basis accounting, the

Company reinstated approximately $1.5 million of accrued rent balances during the year ended December 31, 2022.

Lessor

Operating Leases

The following table summarizes the components of lease revenue recognized during the years ended December 31, 2022, 2021 and 2020 included within the Company's Consolidated Statements of Operations (in thousands):

	Year ended December 31,
Lease Revenue	2022		2021		2020
Fixed contractual payments	$	2,426,007	$	2,319,362	$	2,211,915
Variable lease payments	492,361		433,652		434,346
	$	2,918,368	$	2,753,014	$	2,646,261

The future contractual lease payments to be received (excluding operating expense reimbursements and percentage rent) by the Company as of December 31, 2022, under non-cancelable operating leases which expire on various dates through 2049 (in thousands): 

Years Ending December 31,
2023	$	2,338,610
2024	2,321,135
2025	2,279,700
2026	2,212,455
2027	2,094,014
Thereafter	13,020,102

No single tenant represented more than 10.0% of the Company’s total lease revenue for the years ended December 31, 2022, 2021 and 2020.

Sales-type Lease

On July 29, 2020, the Company entered into a 99-year ground lease with a third-party hotel developer for land at its Reston Next property located in Reston, Virginia, which will support the development of a 267-room, approximately 241,000 square foot hotel property. The lease commenced on October 21, 2020 and upon commencement, the Company performed classification testing. The ground lease was subject to termination rights and as of the lease commencement date, the Company was not reasonably certain that those termination rights would not be exercised. As such, the Company accounted for the ground lease as an operating lease. On December 19, 2022, the Company amended the ground lease which included the elimination of the termination rights. As a result, this lease was reclassified as a sales-type lease.

The Company recorded a sales-type lease receivable of approximately $13.0 million, which includes an unguaranteed residual asset of approximately $17,000. The sales-type lease receivable was measured as the present value of the fixed and determinable lease payments, including the unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease.

In addition, the Company recorded a gain on sales-type lease of approximately $10.1 million associated with the derecognition of the asset. The Company did not recognize any interest income during the year ended December 31, 2022.

The following table provides the future contractual payments to be received as of December 31, 2022 (in thousands):

	Sales-Type
2023	$	—
2024	31
2025	124
2026	372
2027	756
Thereafter	268,249
Total lease payments to be received	269,532
Less:
Interest portion	256,504
Sales-type lease receivable	13,028
Unguaranteed residual asset	17
Current expected credit loss adjustment	(234)
Sales-type lease receivable, net	$	12,811

Lessee, Operating Leases

Lessee

The Company has four non-cancelable ground lease obligations, as lessee, which were classified as operating leases, with various initial term expiration dates through 2114 for the years ended December 31, 2022, 2021 and 2020. The Company recognizes ground rent expense on a straight-line basis over the term of the respective ground lease agreements. As of December 31, 2022, none of the amounts disclosed below for these ground leases contain variable payments, extension options or residual value guarantees.

The Company has four finance lease obligations with various initial term expiration dates through 2094 for the years ended December 31, 2022, 2021 and 2020.

The following table provides lease cost information for the Company’s operating and finance leases for the years ended December 31, 2022, 2021 and 2020 (in thousands):

	Year ended December 31,
Lease costs	2022		2021		2020
Operating lease costs	$	12,700	$	13,151	$	13,948
Finance lease costs
Amortization of right of use asset (1)	$	697	$	547	$	56
Interest on lease liabilities (2)	$	3,236	$	2,471	$	583

_______________

(1)The finance leases relate to either land, buildings or assets that remain in development. For land leases classified as finance leases because of a purchase option that the Company views as an economic incentive, the Company follows its existing policy and does not depreciate land because it is assumed to have an indefinite life. For all other finance leases, the Company would amortize the right of use asset over the shorter of the useful life of the asset or the lease term. If the finance lease relates to a property under development, the amortization of the right of use asset may be eligible for capitalization. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company’s policy.

(2)One, two and three of the finance leases relate to assets under development for all or a portion of the years ended December 31, 2022, December 31, 2021 and December 31, 2020, respectively, and as such, a portion of the interest amount was capitalized.

The following table provides other quantitative information for the Company’s operating and finance leases as of December 31, 2022 and December 31, 2021:

	December 31, 2022		December 31, 2021
Other information
Weighted-average remaining lease term (in years)
Operating leases	49		50
Finance leases	68		69
Weighted-average discount rate
Operating leases	5.7	%	5.7	%
Finance leases	6.2	%	6.2	%

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2022 (in thousands):

	Operating		Finance
2023	$	22,415	$	9,306
2024 (1)	22,274		49,343
2025	10,308		9,971
2026	10,100		10,166
2027	9,885		10,364
Thereafter	528,915		1,352,647
Total lease payments	603,897		1,441,797
Less:
Interest portion	399,211		1,192,462
Present value of lease payments	$	204,686	$	249,335

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2021 (in thousands):

	Operating		Finance
2022	$	19,623	$	8,762
2023	25,333		10,826
2024 (1)	10,085		48,605
2025	10,307		9,971
2026	10,100		10,166
Thereafter	538,801		1,363,011
Total lease payments	614,249		1,451,341
Less:
Interest portion	409,688		1,206,920
Present value of lease payments	$	204,561	$	244,421

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

XML

Deferred Charges

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Deferred Charges

5. Deferred Charges

Deferred charges consisted of the following at December 31, 2022 and 2021 (in thousands): 

	December 31, 2022		December 31, 2021
Leasing costs, including lease related intangibles	$	1,095,231	$	1,011,229
Financing costs	19,311		19,231
	1,114,542		1,030,460
Less: Accumulated amortization	(381,260)		(411,662)
	$	733,282	$	618,798

The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2023	$	27,659
2024	21,595
2025	21,419
2026	20,571
2027	18,214

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Investments in Unconsolidated Joint Ventures

12 Months Ended

Dec. 31, 2022

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

6. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			December 31, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,198)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,629)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,493)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,971		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,185)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		46,839		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,414		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,366		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,716		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,465		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%	(5)	(19,921)		28,412
CA-Colorado Center, LLC	Colorado Center	50.00	%		233,862		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,152		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,397		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		164,735		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(6)	158,109		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(7)	324,038		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,000		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(8)	69,785		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(9)	114,992		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(10)	11,351		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(7)	80,714		N/A
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		120,083		N/A
					$	1,630,485	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

(2)The Company’s economic ownership has increased based on the achievement of certain return thresholds. At December 31, 2022 and December 31, 2021, the Company’s economic ownership was approximately 50%.

(3)The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.

(4)Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This property includes net equity balances from the amenity joint venture.

(6)This entity is a VIE (See Note 2).

(7)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(8)The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.

(9)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(10)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

Certain of the Company’s unconsolidated joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. Under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, the partners or the Company will be entitled to an additional promoted interest or payments.

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	December 31, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,537,554	$	5,579,218
Other assets	756,786		586,470
Total assets	$	7,294,340	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,022,746	$	3,214,961
Other liabilities (2)	716,271		652,135
Members’/Partners’ equity	2,555,323		2,298,592
Total liabilities and members’/partners’ equity	$	7,294,340	$	6,165,688
Company’s share of equity	$	1,238,929	$	1,104,175
Basis differentials (3)	391,556		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,630,485	$	1,445,926

_______________

(1)At December 31, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At December 31, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.2 million and $22.3 million, respectively.

(2)At December 31, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $382.2 million and $385.5 million, respectively. At December 31, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 million, respectively.

(3)This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The majority of the Company’s basis differences are as follows:

	December 31, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	301,820	$	304,776
200 Fifth Avenue	94,497		N/A
Gateway Commons	47,808		51,009
Dock 72	(98,980)		(50,051)

These basis differentials (excluding land) will be amortized over the remaining lives of the related assets and liabilities.

(4)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows: 

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Total revenue (1)	$	512,078	$	383,649	$	319,560
Expenses
Operating	198,632		158,498		144,347
Transaction costs	837		470		1,027
Depreciation and amortization	181,041		147,121		141,853
Total expenses	380,510		306,089		287,227
Other income (expense)
Loss from early extinguishment of debt	(1,327)		—		—
Interest expense	(154,065)		(108,884)		(98,051)
Unrealized gain on derivative instruments	1,681		—		—
Gains on sales of real estate (2)	—		—		11,737
Net loss	$	(22,143)	$	(31,324)	$	(53,981)
Company’s share of net loss	$	(2,551)	$	(10,254)	$	(16,256)
Gain on sale of investment (3)	—		10,257		—
Impairment loss on investment (4)	(50,705)		—		(60,524)
Basis differential (5)	(6,584)		(2,573)		(8,330)
Loss from unconsolidated joint ventures	$	(59,840)	$	(2,570)	$	(85,110)

_______________ 

(1)Includes straight-line rent adjustments of approximately $62.9 million, $17.2 million and $(10.1) million for the years ended December 31, 2022, 2021 and 2020, respectively.

(2)For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

(3)During the year ended December 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.

(4)During the years ended December 31, 2022 and December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million and $60.5 million, respectively.

(5)Includes straight-line rent adjustments of approximately $0.5 million, $0.8 million and $1.8 million for the years ended December 31, 2022, 2021 and 2020, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million, $0.4 million and $0.9 million for the years ended December 31, 2022, 2021 and 2020, respectively.

On January 18, 2022, a joint venture in which the Company owns a 50% interest commenced the redevelopment of 651 Gateway located in South San Francisco, California. 651 Gateway is a premier workplace that is being converted to approximately 327,000 net rentable square feet of life sciences space.

On February 2, 2022, a joint venture in which the Company owns a 55% interest commenced the development of the first phase of Platform 16, a premier workplace project located in San Jose, California, that is expected to contain approximately 1.1 million net rentable square feet upon completion. The first phase of the development projects includes the construction of an approximately 390,000 net rentable square foot premier workplace building and a below-grade parking garage.

On March 28, 2022, a joint venture in which the Company owns a 20% interest refinanced with a new lender the debt secured by its Metropolitan Square property located in Washington, DC. At the time of the refinancing, the loan had an outstanding balance of approximately $294.1 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.65%, plus (2) 4.75% per annum and was scheduled to mature on July 7, 2022, with two, one-year extension options, subject to certain conditions. There was no prepayment penalty associated with

the prepayment of the previous mortgage loan. The joint venture recognized a loss from early extinguishment of debt totaling approximately $1.3 million due to the write-off of unamortized deferred financing costs. In conjunction with the refinancing, the joint venture settled its interest rate cap agreement, entered into in 2020, to limit its exposure to increases in the LIBOR rate. The new mortgage and mezzanine loans have an aggregate principal balance of $420.0 million, bear interest at a weighted average variable rate equal to the Secured Overnight Financing Rate (“SOFR“) plus 2.75% per annum and mature on April 9, 2024, with three, one-year extension options, subject to certain conditions. The joint venture distributed excess loan proceeds from the new mortgage and mezzanine loans totaling approximately $100.5 million, of which the Company’s share totaled approximately $20.1 million. On September 1, 2022, the joint venture entered into an interest rate cap agreement that capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

On April 18, 2022, a joint venture in which the Company owns a 50% interest extended the maturity date of the construction loan collateralized by its Hub50House property to June 19, 2022. At the time of the extension, the loan had an outstanding balance of approximately $176.5 million, bore interest at a variable rate equal to LIBOR plus 2.00% per annum and was scheduled to mature on April 19, 2022. On June 17, 2022, the joint venture repaid the existing construction loan and obtained a new mortgage loan. The new mortgage loan has a principal balance of $185.0 million, bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. At closing, the joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts. In conjunction with the new mortgage loan, the joint venture paid off the existing construction loan. At the time of the payoff of the construction loan, the outstanding balance of the loan totaled approximately $176.7 million. The joint venture distributed excess loan proceeds from the new mortgage loan totaling approximately $6.8 million, of which the Company’s share totaled approximately $3.4 million. Hub50House is a residential property that consists of approximately 320,000 net rentable square feet and 440 residential units located in Boston, Massachusetts.

On May 13, 2022, the Company entered into a joint venture with a third party to own, operate and develop Reston Next Residential located in Reston, Virginia. Reston Next Residential is expected to consist of 508 residential rental units upon completion. The Company contributed approximately $11.3 million of improvements at closing and will contribute cash totaling approximately $3.5 million post closing for its 20% ownership interest in the joint venture. The partner contributed approximately $0.5 million of cash at closing and will contribute cash totaling approximately $58.7 million in the future for its 80% ownership interest in the joint venture. As a result of the partner’s deferred contribution, as of the acquisition date, the Company owned an approximately 96% interest in the joint venture. On May 13, 2022, the joint venture commenced development and entered into a construction loan collateralized by the property. The construction loan has a principal amount of up to $140.0 million, bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

On June 16, 2022, the Company entered into a joint venture with a third party to own, operate and develop 751 Gateway, a laboratory building located in South San Francisco, California, that is expected to be approximately 231,000 net rentable square feet upon completion. 751 Gateway was previously part of the Company’s Gateway Commons joint venture. The Company contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $2.6 million for its 49% ownership interest in the joint venture. The partner contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $4.9 million for its 51% ownership interest in the joint venture.

On August 8, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bore interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, has a total commitment amount of approximately $198.4 million, and continued to mature on December 18, 2023. On December 22, 2022, the joint venture further modified the construction loan. The further modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 2.50% per annum, has a total commitment amount of approximately $198.4 million, and matures on December 18, 2025. During December 2022, the Company recognized a non-cash impairment charge totaling approximately $50.7 million, which represented the other-than temporary decline in the fair value below the carrying value of the Company’s investment in the unconsolidated joint venture that owns Dock 72. The Company assessed the impairment and concluded that it was other than temporary. The Company determined that its valuation of the

investment was categorized within Level 3 of the fair value hierarchy, as it utilized significant unobservable inputs in its assessment including an exit capitalization rate of 5.75%, a discount rate on the Company’s equity investment (the property is encumbered by mortgage debt) of 7.0% and leasing the currently available space over the period of 2023-2026. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

On September 9, 2022, a joint venture in which the Company owns an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan had an outstanding balance of approximately $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

On November 17, 2022, the Company acquired a 26.69% interest in the joint venture that owns 200 Fifth Avenue located in New York, New York, for a gross purchase price of approximately $280.2 million, which included $120.1 million of cash and the Company’s pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum and matures on November 24, 2028. The joint venture has interest rate swap contracts with notional amounts aggregating $600.0 million through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts. 200 Fifth Avenue is a 14-story, approximately 855,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket.

On December 7, 2022, a joint venture in which the Company owns a 50% interest modified the mortgage loan collateralized by its Market Square North property located in Washington, DC. At the time of the modification the loan had an outstanding balance of approximately $125.0 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.50%, plus (2) 2.30% per annum, and was scheduled to mature on November 10, 2025, with one, one-year extension option subject to certain conditions. The modified mortgage loan bears interest at a variable rate equal to the greater of (1) the sum of (x) the “benchmark rate”, (y) 2.30% and (z) the adjustment applicable to such “benchmark rate” (approximately 0.11% for Term SOFR), or (2) 2.80%. For the period December 7, 2022 through March 9, 2023, the “benchmark rate” means LIBOR, and for the period after March 10, 2023, through the maturity date, Term SOFR. The modified mortgage loan continues to mature on November 10, 2025, with a one-year extension option subject to certain conditions. Market Square North is a premier workplace with approximately 418,000 net rentable square feet located in Washington, DC.

On December 23, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its The Hub on Causeway – Podium property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $174.3 million, bore interest at a variable rate equal to LIBOR plus 2.25% per annum, and was scheduled to mature on September 6, 2023. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 2.25% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan bears interest at a variable rate equal to Term SOFR plus 2.35% per annum. The modified construction loan continues to mature on September 6, 2023. The Hub on Causeway – Podium is a premier workplace with approximately 380,000 net rentable square feet located in Boston, Massachusetts.

On December 23, 2022, a joint venture in which the Company owns a 50% interest modified the construction loan collateralized by its 100 Causeway Street property located in Boston, Massachusetts. At the time of the modification, the loan had an outstanding balance of approximately $337.6 million, bore interest at a variable rate equal to LIBOR plus 1.50% per annum, and was scheduled to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. The modified construction loan continues to bear interest at a variable rate equal to LIBOR plus 1.50% per annum for the period from December 23, 2022 through April 30, 2023. For the period from May 1, 2023 through the maturity date, the construction loan will bear interest at a variable rate equal to Term SOFR plus 1.60% per annum. The modified construction loan continues to mature on September 5, 2023, with two, one-year extension options, subject to certain conditions. 100 Causeway Street is a premier workplace with approximately 630,000 net rentable square feet located in Boston, Massachusetts.

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Debt

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Mortgage Notes Payable Disclosure

7. Debt

Mortgage Notes Payable

The Company had outstanding mortgage notes payable totaling approximately $3.3 billion as of December 31, 2022 and 2021, each collateralized by one or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly installments and mature at various dates through January 9, 2032.

Fixed rate mortgage notes payable totaled approximately $3.3 billion at December 31, 2022 and 2021, with contractual interest rates ranging from 2.79% to 3.43% per annum at December 31, 2022 and 2021 (with a weighted-average interest rate of 3.24% at December 31, 2022 and 2021). There were no variable rate mortgage loans at December 31, 2022 and 2021.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2022 are as follows (dollars in thousands): 

	Principal Payments
2023	$	—
2024	—
2025	—
2026	—
2027	2,300,000
Thereafter	1,000,000
Total aggregate principal payments	3,300,000
Less:
Deferred financing costs, net	27,632
Total carrying value of mortgage notes payable, net	$	3,272,368

Unsecured Debt Disclosure

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2022 (dollars in thousands): 

	Coupon/Stated Rate		Effective Rate(1)		Principal Amount		Maturity Date(2)
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	$	500,000	September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000		February 1, 2024
7 Year Unsecured Senior Notes	3.200	%	3.350	%	850,000		January 15, 2025
10 Year Unsecured Senior Notes	3.650	%	3.766	%	1,000,000		February 1, 2026
10 Year Unsecured Senior Notes	2.750	%	3.495	%	1,000,000		October 1, 2026
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
10 Year Unsecured Senior Notes	4.500	%	4.628	%	1,000,000		December 1, 2028
10 Year Unsecured Senior Notes	3.400	%	3.505	%	850,000		June 21, 2029
10.5 Year Unsecured Senior Notes	2.900	%	2.984	%	700,000		March 15, 2030
10.75 Year Unsecured Senior Notes	3.250	%	3.343	%	1,250,000		January 30, 2031
11 Year Unsecured Senior Notes	2.550	%	2.671	%	850,000		April 1, 2032
12 Year Unsecured Senior Notes	2.450	%	2.524	%	850,000		October 1, 2033
Total principal					10,300,000
Less:
Net unamortized discount					14,094
Deferred financing costs, net					47,938
Total					$	10,237,968

_______________

(1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

(2)No principal amounts are due prior to maturity.

On November 17, 2022, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.750% unsecured senior notes due 2027. The notes were priced at 99.941% of the principal amount to yield an effective rate (including financing fees) of approximately 6.924% per annum to maturity. The notes will mature on December 1, 2027, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $743.5 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2022, BPLP was in compliance with each of these financial restrictions and requirements.

Unsecured Credit Facility

On June 15, 2021, BPLP amended and restated its prior credit facility (as amended and restated, the “2021 Credit Facility”). The 2021 Credit Facility provides for borrowings of up to $1.5 billion through the Revolving Facility, subject to customary conditions. Among other things, the 2021 Credit Facility (1) extended the maturity date from April 24, 2022 to June 15, 2026, (2) eliminated the $500.0 million delayed draw facility, (3) reduced the per annum variable interest rates on borrowings and (4) added a sustainability-linked pricing component. Under the 2021 Credit Facility, BPLP may increase the total commitment by up to $500.0 million by increasing the amount of the Revolving Facility and/or by incurring one or more term loans, in each case, subject to syndication of the increase and other conditions.

At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating. The 2021 Credit Facility includes provisions which allow LIBOR Daily Floating Rate to be switched to SOFR.

The 2021 Credit Facility also features a sustainability-linked pricing component such that if BPLP meets certain sustainability performance targets, the applicable per annum interest rate will be reduced by one basis point. The LIBOR replacement provisions in the 2021 Credit Facility permit the use of rates based on the secured overnight financing rate administered by the Federal Reserve Bank of New York plus an applicable spread adjustment. In addition, the 2021 Credit Facility contains a competitive bid option for up to 65% of the Revolving Facility that allows banks that are part of the lender consortium to bid to make loan advances to BPLP at a reduced interest rate.

Pursuant to the 2021 Credit Facility, BPLP is obligated to pay (1) in quarterly installments a facility fee on the total commitment under the Revolving Facility at a rate per annum ranging from 0.10% to 0.30% based on BPLP’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit ranging from 0.70% to 1.40% based on BPLP’s credit rating.

Based on BPLP’s December 31, 2022 credit rating, (1) the applicable Eurocurrency and LIBOR Daily Floating Rate margins are 0.775%, (2) the alternate base rate margin is zero basis points and (3) the facility fee is 0.15% per annum.

At December 31, 2022, BPLP had no amount outstanding under its Revolving Facility. At December 31, 2021, BPLP had $145.0 million outstanding under its Revolving Facility.

Unsecured Term Loan

On May 17, 2022, BPLP entered into the 2022 Unsecured Term Loan, which provided for a single borrowing of up to $730.0 million. The 2022 Unsecured Term Loan matures on May 16, 2023 (See Note 16).

At BPLP’s option, the 2022 Unsecured Term Loan bore interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate was unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the 2022 Unsecured Term Loan (See Note 3). As of December 31, 2022, the 2022 Unsecured Term Loan bore interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s credit rating at December 31, 2022. At December 31, 2022, BPLP had $730.0 million outstanding under the 2022 Unsecured Term Loan (see Note 16).

2021 Credit Facility and 2022 Unsecured Term Loan Compliance

The 2021 Credit Facility and 2022 Unsecured Term Loan contain customary representations and warranties, affirmative and negative covenants and events of default provisions, including the failure to pay indebtedness, breaches of covenants and bankruptcy and other insolvency events, which could result in the acceleration of the obligation to repay, in the case of the 2021 Credit Facility, all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Facility and, in the case of the 2022 Unsecured Term Loan, any outstanding amount under the 2022 Unsecured Term Loan. Among other covenants, the 2021 Credit Facility and the 2022 Unsecured Term Loan require that BPLP maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments. At December 31, 2022, BPLP was in compliance with each of these financial and other covenant requirements.

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 

The Company had letter of credit and performance obligations related to lender and development requirements that total approximately $26.5 million at December 31, 2022.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. From time to time, under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, either the Company or its partners may be entitled to an additional promoted interest or payments.

From time to time, the Company (or ventures in which the Company has an ownership interest) has agreed, and may in the future agree, to (1) guarantee portions of the principal, interest and other amounts in connection with their borrowings, (2) provide customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) in connection with their borrowings and (3) provide guarantees to lenders, tenants and other third parties for the completion of development projects. The Company has agreements with its outside or joint venture partners whereby the partners agree to reimburse the joint venture for their share of any payments made under the guarantee. In some cases, the Company earns a fee from the applicable joint venture for providing the guarantee.

In connection with the refinancing of 767 Fifth Avenue’s (the General Motors Building) secured loan by the Company’s consolidated joint venture entity, 767 Venture, LLC, the Company guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of December 31, 2022, the maximum funding obligation under the guarantee was approximately $13.7 million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made

under the guarantee. As of December 31, 2022, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the 7750 Wisconsin Avenue office property located in Bethesda, Maryland, the Company entered into agreements with affiliates of The Bernstein Companies (the Company’s partner in the 7750 Wisconsin Avenue joint venture) under which the Company could be required to act as a mezzanine and/or mortgage lender and finance the construction of the hotel property being developed by an affiliate of The Bernstein Companies adjacent to the office property.   An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from the Company under such agreements, and the Company provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest. The financing was recorded as Note Receivable, Net in the Company’s Consolidated Balance Sheets.

In connection with the redevelopment of the Company’s 325 Main Street property located in Cambridge, Massachusetts, the Company was required pursuant to the local zoning ordinance and urban renewal plan to commence construction of a residential building of at least 200,000 square feet with 25% of the project designated as income-restricted (with a minimum of 20% of the square footage devoted to home ownership units) prior to the occupancy of the 325 Main Street property. Each of the zoning ordinance and urban renewal plan was amended to decouple the residential requirement from the occupancy of the 325 Main Street property. 325 Main Street consisted of an approximately 115,000 net rentable square foot premier workplace that was demolished and redeveloped into an approximately 414,000 net rentable square foot premier workplace. While the amendment to the urban renewal plan is subject to completion of administrative processes, the City of Cambridge issued a temporary certificate of occupancy in the second quarter of 2022 (See Note 3).

Concentrations of Credit Risk 

Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Company’s properties are geographically diverse and tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on the Company. 

Insurance

The Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $1.35 billion of property insurance in excess of the $1.0 billion of coverage in the Company’s property insurance program for 601 Lexington Avenue, New York, New York, consisting of $750 million of property and Terrorism Coverage in excess of the Company’s property insurance program and $600 million of Terrorism Coverage only in excess of the $1.75 billion of coverage. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in the Company’s portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage provided by IXP is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $200 million, the coinsurance is 20% and the deductible is 20% of the premiums earned by the insurer for the year prior to a claim. If the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if TRIA is not extended after its expiration on December 31, 2027, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes. Specifically, the Company currently carries earthquake insurance which covers its San Francisco and Los Angeles regions with a $330 million per occurrence limit, and a $330 million annual aggregate limit, $30 million of which is provided by IXP, as a direct insurer. This insurance is subject to a deductible in the amount of 3% of the value of the affected property. In addition, the Company currently carries earthquake insurance which covers its Seattle region with a $110 million per occurrence limit, and a $110 million annual aggregate limit. This insurance is subject to a deductible in the amount of 2% of the value of the affected property. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Company’s ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance or change the structure of its earthquake insurance program on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s earthquake insurance coverage for its Greater San Francisco and Los Angeles properties and the Company’s NBCR Coverage. Insofar as the Company owns IXP, it is responsible for its liquidity and capital resources, and the accounts of IXP are part of the Company’s consolidated financial statements. In particular, if a loss occurs which is covered by the Company’s NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and its insurance policy is maintained after the payout by the Federal Government. If the Company experiences a loss and IXP is required to pay under its insurance policy, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, BPLP has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism, earthquakes and pandemics, in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes, pandemics or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company’s business and financial condition and results of operations.

Legal Matters 

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company. 

State and Local Tax Matters 

Because BXP is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Company’s results of operations. 

Environmental Matters 

It is the Company’s policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Company’s acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that the Company believes will have a

material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Company’s properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, the Company (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Company’s ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses and contractual limitations, including time limits, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

Environmental investigations at some of the Company’s properties and certain properties owned by affiliates of the Company have identified groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time. 

Some of the Company’s properties and certain properties owned by the Company’s affiliates are located in urban, industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations, it is the Company’s practice to investigate the nature and extent of detected contamination, including potential issues associated with vapor intrusion concerns and/or potential contaminant migration to or from the subject property in ground water, assess potential liability risks and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its decision-making process with respect to the acquisition, deal structure and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. The Company has developed an office park on this property. Prior to and during redevelopment activities, the Company engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws.

The Company expects that resolution of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Company’s properties or that the Company will be indemnified, in full or at all or that the Company will have insurance coverage, in the event that such environmental liabilities arise.

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Noncontrolling Interests

12 Months Ended

Dec. 31, 2022

Noncontrolling Interest [Abstract]

Noncontrolling Interests

9. Noncontrolling Interests

Noncontrolling interests relate to the interests in BPLP not owned by BXP and interests in consolidated property partnerships not wholly-owned by the Company. As of December 31, 2022, the noncontrolling interests in BPLP consisted of 16,531,172 OP Units, 1,679,175 LTIP Units (including 464,036 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2019 (i.e., 2012 OPP and 2013 - 2019 MYLTIP awards)), 203,278 2020 MYLTIP Units, 350,989 2021 MYLTIP Units and 253,453 2022 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the years ended December 31, 2022 and 2021, 182,929 and 523,969 OP Units, respectively, were presented by the holders for redemption (including 78,249 and 148,442 OP Units, respectively, issued upon conversion of LTIP Units, 2012 OPP Units and MYLTIP Units) and were redeemed by BXP in exchange for an equal number of shares of Common Stock.

At December 31, 2022, BPLP had outstanding 203,278 2020 MYLTIP Units, 350,989 2021 MYLTIP Units and 253,453 2022 MYLTIP Units. Prior to the end of the respective three-year performance period for each plan, holders of MYLTIP Units are entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the three-year performance period for each plan has ended, (1) the number of MYLTIP Units, both vested and unvested, that MYLTIP award recipients have earned, if any, based on the establishment of a performance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit and (2) with respect to the 2021 MYLTIP and 2022 MYLTIP only, the Company will make a “catch-up” cash payment on the MYLTIP Units that are ultimately earned in an amount equal to the regular and special dividends, if any, declared during the performance period on Common Stock, less the distributions actually paid during the performance period on all of the awarded 2021 MYLTIP Units and 2022 MYLTIP Units.

On February 6, 2020, the measurement period for the Company’s 2017 MYLTIP awards ended and, based on BXP’s relative total stockholder return (“TSR”) performance, the final awards were determined to be 83.8% of target, or an aggregate of approximately $17.6 million (after giving effect to employee separations). As a result, an aggregate of 270,942 2017 MYLTIP Units that had been previously granted were automatically forfeited.

On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.

On December 14, 2021, BPLP issued approximately 866,503 OP Units as partial consideration for the acquisition of 360 Park Avenue South in New York, New York. The OP Units issued totaled approximately $99.7 million based on the average closing price per share of BXP’s common stock for the five trading days immediately preceding the closing date.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the year ended December 31, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 30, 2022	January 30, 2023	$0.98	$0.098
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the year ended December 31, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2021	January 28, 2022	$0.98	$0.098
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2016 MYLTIP Units and, after the February 6, 2020 measurement date, the 2017 MYLTIP Units) and its distributions on the 2017 MYLTIP Units (prior to the February 6, 2020 measurement date) and 2018 - 2020 MYLTIP Units (after the February 4, 2020 issuance date of the 2020 MYLTIP Units) that occurred during the year ended December 31, 2020:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2020	January 28, 2021	$0.98	$0.098
September 30, 2020	October 30, 2020	$0.98	$0.098
June 30, 2020	July 31, 2020	$0.98	$0.098
March 31, 2020	April 30, 2020	$0.98	$0.098
December 31, 2019	January 30, 2020	$0.98	$0.098

A holder of an OP Unit may present the OP Unit to BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, BPLP must redeem the OP Unit for cash equal to the then value of a share of Common Stock of BXP. BXP may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (other than OP Units owned by BXP), and LTIP Units (including the 2012 OPP Units and 2013 - 2019 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at December 31, 2022 was approximately $1.3 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $67.58 per share on December 30, 2022.

Noncontrolling Interests—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $1.5 billion and $1.6 billion at December 31, 2022 and December 31, 2021, respectively, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

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Stockholders' Equity / Partners' Capital

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Stockholders' Equity / Partners' Capital

10. Stockholders’ Equity / Partners’ Capital

BXP

As of December 31, 2022, BXP had 156,757,867 shares of Common Stock outstanding.

As of December 31, 2022, BXP owned 1,749,682 general partnership units and 155,008,185 limited partnership units in BPLP.

On May 22, 2020, BXP renewed its “at the market” (“ATM”) stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its Common Stock through sales agents over a three-year period. Under the ATM stock offering program, BXP may also engage in forward sale transactions with affiliates of certain sales agents for the sale of its Common Stock on a forward basis. This program replaced BXP’s prior $600.0 million ATM stock offering program that was scheduled to expire on June 2, 2020. BXP intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. No shares of Common Stock have been issued under this ATM stock offering program.

During the year ended December 31, 2022, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock. During the year ended December 31, 2021, BXP issued 247,920 shares of Common Stock upon the exercise of options to purchase Common Stock.

During the years ended December 31, 2022 and December 31, 2021, BXP issued 182,929 and 523,969 shares of Common Stock, respectively, in connection with the redemption of an equal number of redeemable OP Units from limited partners.

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2022, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
December 30, 2022	January 30, 2023	$0.98	$0.98
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98
September 30, 2020	October 30, 2020	$0.98	$0.98
June 30, 2020	July 31, 2020	$0.98	$0.98
March 31, 2020	April 30, 2020	$0.98	$0.98
December 31, 2019	January 30, 2020	$0.98	$0.98

Preferred Stock

At December 31, 2020, BXP had 80,000 shares (8,000,000 Depositary Shares each representing 1/100th of a share) outstanding of its 5.25% Series B Preferred Stock with a liquidation preference of $2,500.00 per share ($25.00 per Depositary Share). BXP paid cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500.00 liquidation preference per share. BXP did not have the right to redeem the Series B Preferred Stock prior to March 27, 2018, except in certain circumstances relating to the preservation of BXP’s REIT status. On and after March 27, 2018, BXP, at its option, could redeem the Series B Preferred Stock for a cash redemption price of $2,500.00 per share ($25.00 per Depositary Share), plus all accrued and unpaid dividends. The Series B Preferred Stock was not redeemable by the holders, had no maturity date and was not convertible into any other security of BXP or its affiliates.

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of its 5.25% Series B Cumulative Redeemable Preferred Stock, which constituted all of the outstanding Series B Preferred Stock, and the corresponding depositary shares, each representing 1/100th of a share of Series B Preferred Stock. The

redemption price per share of Series B Preferred Stock was $2,500, plus all accrued and unpaid dividends to, but not including, the redemption date, totaling $2,516.41 per share. On March 31, 2021, the Company transferred the full redemption price for all outstanding shares of Series B Preferred Stock of approximately $201.3 million, including approximately $1.3 million of accrued and unpaid dividends to, but not including, the redemption date, to the redemption agent. The excess of the redemption price over the carrying value of the Series B Preferred Stock and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. Common Shareholders and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders on the Consolidated Income Statements.

On April 1, 2021, BXP redeemed all of the outstanding shares of Series B Preferred Stock and all of the outstanding Depositary Shares. In connection with the redemption of the Series B Preferred Stock, all of the Series B Preferred Units, which had terms and preferences generally mirroring those of the Series B Preferred Stock, were redeemed by BPLP.

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the years ended December 31, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125
November 4, 2020	November 16, 2020	$32.8125
August 3, 2020	August 17, 2020	$32.8125
May 1, 2020	May 15, 2020	$32.8125
February 4, 2020	February 18, 2020	$32.8125

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Segment Information

12 Months Ended

Dec. 31, 2022

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

11. Segment Information

The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to the Company’s share of Net Operating Income for the years ended December 31, 2022, 2021 and 2020.

BXP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	$	496,223	$	862,227
Add:
Preferred stock redemption charge	—		6,412		—
Preferred dividends	—		2,560		10,500
Noncontrolling interest—common units of the Operating Partnership	96,780		55,931		97,704
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	749,775		717,336		683,751
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	437,019		123,660		618,982
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

BPLP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Add:
Preferred unit redemption charge	—		6,412		—
Preferred distributions	—		2,560		10,500
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	742,293		709,035		676,666
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	441,075		125,198		631,945
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred stock/unit redemption charge, preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, losses from early extinguishment of debt, unrealized loss on non-real estate investment, net operating income from unconsolidated joint ventures, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales-type lease, gains on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue. The Company believes NOI is useful to investors as a performance measure and believes it provides useful information to investors regarding its results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the

financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, may distort operating performance measures at the property level. NOI presented by the Company may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.

The Company’s internal reporting utilizes its share of NOI, which includes its share of NOI from consolidated and unconsolidated joint ventures, which is a non-GAAP financial measure that is calculated as the consolidated amount, plus the Company’s share of the amount from the Company’s unconsolidated joint ventures (calculated based upon the Company’s economic percentage ownership interest and, in some cases, after priority allocations), less the Company’s partners’ share of the amount from the Company’s consolidated joint ventures (calculated based upon the partners’ economic percentage ownership interests and, in some cases, after priority allocations, income allocation to private REIT shareholders and their share of fees due to the Company). The Company’s share of NOI from unconsolidated joint ventures does not include its share of losses from early extinguishment of debt from unconsolidated joint ventures, gains on sales of real estate from unconsolidated joint ventures and gain on sale of investment from unconsolidated joint ventures, both of which are included within Income (Loss) From Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.  Management utilizes its share of NOI in assessing its performance as the Company has several significant joint ventures and, in some cases, the Company exercises significant influence over, but does not control, the joint venture, in which case GAAP requires that the Company account for the joint venture entity using the equity method of accounting and the Company does not consolidate it for financial reporting purposes. In other cases, GAAP requires that the Company consolidate the venture even though the Company’s partner(s) owns a significant percentage interest. As a result, the presentations of the Company’s share of NOI should not be considered a substitute for, and should only be considered together with and as a supplement to, the Company’s financial information presented in accordance with GAAP.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Preferred stock/unit redemption charge, preferred dividends/distributions, interest expense, losses from early extinguishment of debt, unrealized loss on non-real estate investment, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gain on sales-type lease, gains on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue are not included in NOI and are provided as reconciling items to the Company’s reconciliations of its share of NOI to net income attributable to common shareholders/unitholders.

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by geographic area. The Company’s segments by geographic area are Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. On September 1, 2021, the Company invested in a joint venture that acquired Safeco Plaza located in Seattle, Washington. As such, the Seattle region was identified as a segment during the third quarter of 2021. The Company also presents information for each segment by property type, including Premier Workplace (which includes office, life sciences and retail), Residential and Hotel.

Parking and other revenue for the year ended December 31, 2022 increased by approximately $25.4 million compared to 2021. These increases were primarily in transient and monthly parking revenue.

Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	1,005,156		$	—		$	1,031,479		$	534,397		$	31,978		$	365,402		$	2,968,412
Residential	15,086			—			—			14,769			—			27,326			57,181
Hotel	39,482			—			—			—			—			—			39,482
Total	1,059,724			—			1,031,479			549,166			31,978			392,728			3,065,075
% of Grand Totals	34.58		%	—		%	33.65		%	17.92		%	1.04		%	12.81		%	100.00		%
Rental Expenses:
Premier Workplace	360,218			—			391,293			183,353			8,386			135,237			1,078,487
Residential	5,961			—			—			11,371			—			12,251			29,583
Hotel	27,478			—			—			—			—			—			27,478
Total	393,657			—			391,293			194,724			8,386			147,488			1,135,548
% of Grand Totals	34.66		%	—		%	34.46		%	17.15		%	0.74		%	12.99		%	100.00		%
Net operating income	$	666,067		$	—		$	640,186		$	354,442		$	23,592		$	245,240		$	1,929,527
% of Grand Totals	34.52		%	—		%	33.18		%	18.37		%	1.22		%	12.71		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(45,822)			—			(145,990)			—			—			—			(191,812)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	34,233			53,023			1,594			12,785			7,690			36,756			146,081
Company’s share of net operating income	$	654,478		$	53,023		$	495,790		$	367,227		$	31,282		$	281,996		$	1,883,796
% of Grand Totals	34.75		%	2.81		%	26.32		%	19.49		%	1.66		%	14.97		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

For the year ended December 31, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	930,560		$	—		$	1,012,172		$	508,620		$	—			$	340,808		$	2,792,160
Residential	13,397			—			—			3,892			—				25,379			42,668
Hotel	13,609			—			—			—			—				—			13,609
Total	957,566			—			1,012,172			512,512			—				366,187			2,848,437
% of Grand Totals	33.62		%	—		%	35.53		%	17.99		%	—		%		12.86		%	100.00		%
Rental Expenses:
Premier Workplace	322,298			—			379,267			168,040			—				127,102			996,707
Residential	5,811			—			—			6,717			—				11,916			24,444
Hotel	12,998			—			—			—			—				—			12,998
Total	341,107			—			379,267			174,757			—			—	139,018			1,034,149
% of Grand Totals	32.98		%	—		%	36.67		%	16.90		%	—		%		13.45		%	100.00		%
Net operating income	$	616,459		$	—		$	632,905		$	337,755		$	—			$	227,169		$	1,814,288
% of Grand Totals	33.98		%	—		%	34.88		%	18.62		%	—		%		12.52		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(43,232)			—			(143,072)			—			—				—			(186,304)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	16,551			51,641			(664)			14,152			2,498				23,578			107,756
Company’s share of net operating income	$	589,778		$	51,641		$	489,169		$	351,907		$	2,498			$	250,747		$	1,735,740
% of Grand Totals	33.98		%	2.98		%	28.18		%	20.27		%	0.14		%		14.45		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

For the year ended December 31, 2020:

	Boston			Los Angeles			New York			San Francisco			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	897,915		$	—		$	935,966		$	508,327		$	336,587		$	2,678,795
Residential	13,616			—			—			155			24,375			38,146
Hotel	7,478			—			—			—			—			7,478
Total	919,009			—			935,966			508,482			360,962			2,724,419
% of Grand Totals	33.73		%	—		%	34.36		%	18.66		%	13.25		%	100.00		%
Rental Expenses:
Premier Workplace	318,509			—			384,753			163,156			132,051			998,469
Residential	5,378			—			—			2,261			11,100			18,739
Hotel	13,136			—			—			—			—			13,136
Total	337,023			—			384,753			165,417			143,151			1,030,344
% of Grand Totals	32.71		%	—		%	37.35		%	16.05		%	13.89		%	100.00		%
Net operating income	$	581,986		$	—		$	551,213		$	343,065		$	217,811		$	1,694,075
% of Grand Totals	34.35		%	—		%	32.54		%	20.25		%	12.86		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(41,849)			—			(121,038)			—			—			(162,887)
Add: Company’s share of net operating income from unconsolidated joint ventures	10,765			57,907			(5,326)			14,928			16,669			94,943
Company’s share of net operating income	$	550,902		$	57,907		$	424,849		$	357,993		$	234,480		$	1,626,131
% of Grand Totals	33.88		%	3.56		%	26.12		%	22.02		%	14.42		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Earnings Per Share / Common Unit

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Earnings Per Share / Common Unit

12. Earnings Per Share / Common Unit

BXP

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. common shareholders and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. common shareholders by the weighted-average number of common shares outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of BXP using the two-class method. Participating securities are included in the computation of diluted EPS of BXP using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BXP excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of BPLP that are exchangeable for BXP’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

	Year ended December 31, 2022
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	156,726	$	5.42
Allocation of undistributed earnings to participating securities	(891)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	848,056		156,726	5.41
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,056	157,137	$	5.40
	Year ended December 31, 2021
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,376	$	3.17
	Year ended December 31, 2020
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	862,227	155,432	$	5.55
Allocation of undistributed earnings to participating securities	(748)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,432	$	5.54
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,517	$	5.54

BPLP

The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership common unitholders and the number of common units used in the computation of basic earnings per common unit, which is calculated by dividing net income attributable to Boston Properties Limited Partnership common unitholders by the weighted-average number of common units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic earnings per common unit using the two-class method. Participating securities are included in the computation of diluted earnings per common unit using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BPLP excludes such units from the diluted earnings per common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per common unit. Included in the number of units (the denominator) below are approximately 17,634,000, 17,034,000 and 17,211,000 redeemable common units for the years ended December 31, 2022, 2021 and 2020, respectively.

	Year ended December 31, 2022
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	174,360	$	5.49
Allocation of undistributed earnings to participating securities	(991)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,360	$	5.48
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,771	$	5.47
	Year ended December 31, 2021
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,410	$	3.24

	Year ended December 31, 2020
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,979	172,643	$	5.68
Allocation of undistributed earnings to participating securities	(830)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,643	$	5.67
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,728	$	5.67

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Employee Benefits Plan

12 Months Ended

Dec. 31, 2022

Disclosure Text Block Supplement [Abstract]

Employee Benefit Plans

13. Employee Benefit Plans

Effective January 1, 1985, the predecessor of the Company adopted a 401(k) Savings Plan (the “Plan”) for its employees. Upon formation, the Company adopted the Plan and the terms of the Plan. 

Under the Plan, as amended, the Company’s matching contribution equals 200% of the first 3% of participant’s eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS ($305,000, $290,000 and $285,000 in 2022, 2021 and 2020, respectively), indexed for inflation) with no vesting requirement. The Company’s aggregate matching contribution for the years ended December 31, 2022, 2021 and 2020 was approximately $4.8 million, $4.7 million and $4.0 million, respectively. 

The Company also maintains a deferred compensation plan that is designed to allow officers of BXP to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2022 and 2021, the Company had maintained approximately $31.7 million and $42.7 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants. The Company’s liability as of December 31, 2022 and 2021 was approximately $31.7 million and $42.7 million, respectively, which are included in the accompanying Consolidated Balance Sheets.

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Stock Option and Incentive Plan

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Stock Option and Incentive Plan

14. Stock Option and Incentive Plan

At BXP’s 2021 annual meeting of stockholders held on May 20, 2021, its stockholders approved the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”). The 2021 Plan replaces the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”) and no further awards will be issued under the 2012 Plan. The material features of the 2021 Plan include, among other things: (i) the maximum number of shares of common stock reserved and available for issuance under the 2021 Plan is 5,400,000 shares less one share for every one share that was granted between March 4, 2021 and May 19, 2021 under the 2012 Plan, (ii) shares of common stock underlying awards granted under the 2021 Plan or the 2012 Plan that are forfeited, canceled or otherwise terminated (other than by exercise) will be added back to the shares of common stock available for issuance under the 2021 Plan and, with respect to “full-value” awards under the 2021 Plan or the 2012 Plan, shares tendered or held back for taxes and shares previously reserved for issuance pursuant to such an award to the extent that such shares are not issued and are no longer issuable pursuant to such an award (e.g., in the event that a full-value award that may be settled in cash or by issuance of shares of common stock is settled in cash) will be added back to the shares available for issuance under the 2021 Plan, (iii) the award of stock options (both incentive and non-qualified options), stock appreciation rights, restricted stock units, restricted stock, unrestricted stock, dividend equivalent rights, cash-based awards and other equity-based awards (including LTIP Units) is permitted, (iv) stock options may not be repriced and “underwater” stock options may not be exchanged for another award or cash

without stockholder approval; and (v) the term of the 2021 Plan is for ten years from the date of stockholder approval.

On February 1, 2022, BXP’s Compensation Committee approved the 2022 MYLTIP awards under the 2021 Plan to certain officers and employees of BXP. The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric.

The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’s TSR equals the custom index TSR; for relative TSR performance between -1,000 basis points and +1,000 basis points, the number of LTIP Units earned will be determined using linear interpolation.

The second component represents the remaining one-half (50%) of the target grant-date value of the 2022 MYLTIP. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’s absolute TSR is greater than -4,000 basis points but less than +6,000 basis points, then the number of LTIP Units earned will be determined using linear interpolation.

Total earned awards under the 2022 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the first and second components and will range from zero to a maximum of 254,061 LTIP Units with a target of approximately 127,031 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on January 31, 2025, but may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. Vesting will be accelerated in the event of a change in control, termination of employment by BXP without cause, or termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control. The 2022 MYLTIP awards are in the form of LTIP Units issued on the grant date, and they are subject to forfeiture to the extent awards are not earned. Prior to the performance measurement date holders of the 2022 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units. Following the completion of the three-year performance period, the Company will also make a “catch-up” cash payment on the 2022 MYLTIP Units that are ultimately earned in an amount equal to the regular and special distributions, if any, declared during the performance period on BXP’s Common Stock, less the distributions actually paid to holders of 2022 MYLTIP Units during the performance period on all of the awarded 2022 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2022 MYLTIP awards have an aggregate value of approximately $17.3 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.

On February 6, 2020, the measurement period for the Company’s 2017 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 83.8% of target, or an aggregate of approximately $17.6 million (after giving effect to employee separations). As a result, an aggregate of 270,942 2017 MYLTIP Units that had been previously granted were automatically forfeited.

BXP issued 41,818, 57,383 and 29,630 shares of restricted common stock and BPLP issued 280,616, 281,640 and 207,181 LTIP Units to employees and non-employee directors under the 2012 Plan and the 2021 Plan during the years ended December 31, 2022, 2021 and 2020, respectively. BXP did not issue any non-qualified stock options under the 2012 Plan or 2021 Plan during the years ended December 31, 2022, 2021 and 2020. BPLP issued 254,061 2022 MYLTIP Units, 352,021 2021 MYLTIP Units and 203,278 2020 MYLTIP Units to employees

under the 2012 Plan and 2021 Plan during the years ended December 31, 2022, 2021 and 2020, respectively. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and MYLTIP Unit. When issued, LTIP Units are not economically equivalent in value to a share of Common Stock, but over time can increase in value to one-for-one parity with Common Stock if there is sufficient appreciation in the value of the Company’s assets. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets of BXP and BPLP. A majority of the grants of restricted common stock and LTIP Units to employees vest in four equal annual installments. Restricted common stock is measured at fair value on the date of grant based on the number of shares granted and the closing price of BXP’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. Because the 2012 OPP Units and 2013 - 2022 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. The Company recognizes forfeitures as they occur on its awards of stock-based compensation. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in BXP’s Consolidated Balance Sheets and Partners’ Capital in BPLP’s Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, LTIP Units and 2017 - 2022 MYLTIP Units was approximately $50.7 million, $49.7 million and $43.0 million for the years ended December 31, 2022, 2021 and 2020, respectively. At December 31, 2022, there was (1) an aggregate of approximately $20.6 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and (2) an aggregate of approximately $4.9 million of unrecognized compensation expense related to unvested 2020 - 2022 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 1.9 years.

The shares of restricted stock were valued at approximately $4.7 million ($111.47 per share weighted-average), $5.8 million ($100.60 per share weighted-average) and $4.0 million ($133.81 per share weighted-average) for the years ended December 31, 2022, 2021 and 2020, respectively. 

LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718. LTIP Units issued during the years ended December 31, 2022, 2021 and 2020 were valued at approximately $28.9 million, $23.8 million and $26.3 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2022, 2021 and 2020 was $103.06, $84.43 and $127.14, respectively. The per unit fair value of each LTIP Unit granted in 2022, 2021 and 2020 was estimated on the date of grant using the following assumptions; an expected life of 5.7 years, 5.7 years and 5.7 years, a risk-free interest rate of 1.71%, 0.65% and 1.47% and an expected price volatility of 31.0%, 30.0% and 18.0%, respectively. 

There were no non-qualified stock options granted during the years ended December 31, 2022, 2021 and 2020.

A summary of the status of BXP’s stock options as of December 31, 2022, 2021 and 2020 and changes during the years then ended are presented below:

	Shares	Weighted-Average Exercise Price
Outstanding at December 31, 2019	395,353	$	96.37
Exercised	(43,792)	$	91.60
Outstanding at December 31, 2020	351,561	$	96.97
Exercised	(247,920)	$	96.95
Outstanding at December 31, 2021	103,641	$	97.01
Exercised	—	$	—
Outstanding at December 31, 2022	103,641	$	97.01

The following table summarizes information about BXP’s stock options outstanding at December 31, 2022: 

Options Outstanding				Options Exercisable
Number Outstanding at 12/31/22	Weighted-Average Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/22	Exercise Price
54,282	0.3 years	$	95.69	54,282	$	95.69
49,359	0.1 years	$	98.46	49,359	$	98.46

There was no total intrinsic value for the outstanding and exercisable stock options as of December 31, 2022. In addition, BXP had 103,641 and 103,641 options exercisable and vested at a weighted-average exercise price of $97.01 and $97.01 at December 31, 2022 and 2021, respectively.

BXP adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the “Stock Purchase Plan”) to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of the Common Stock during the last ten business days of the purchase period. BXP issued 9,813, 9,846 and 7,195 shares with the weighted-average purchase price equal to $87.30 per share, $89.73 per share and $90.53 per share under the Stock Purchase Plan during the years ended December 31, 2022, 2021 and 2020, respectively.

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Related Party Disclosures

12 Months Ended

Dec. 31, 2022

Related Party Transactions [Abstract]

Related Party Transactions Disclosure

15. Related Party Transactions  

A firm controlled by Mr. Raymond A. Ritchey’s brother was paid aggregate leasing commissions of approximately $914,000 during the year ended December 31, 2020 related to certain exclusive leasing arrangements for certain Northern Virginia properties. There were no payments made for the years ended December 31, 2022 and 2021. In addition, Mr. Ritchey’s brother is employed by a real estate brokerage firm and participated in brokerage activities for which the Company paid the firm approximately $1.6 million, $1.9 million and $3.4 million for the years ended December 31, 2022, 2021 and 2020, respectively. Mr. Ritchey is a Senior Executive Vice President of BXP.

On July 13, 2018, the Company entered into a joint venture with a third party to acquire a development site at 3 Hudson Boulevard that, upon the future acquisition of additional available development rights, can accommodate an office tower with up to 2.0 million net rentable square feet located on the entire square block between 11th Avenue and Hudson Boulevard Park from West 34th Street to West 35th Street in New York City. The Company owns a 25% interest in, and is the managing member of, the joint venture. The Company provided $80.0 million of mortgage financing to the joint venture that bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions. The loan has been reflected as a Related Party Note Receivable, Net on the Company’s Consolidated Balance Sheets. The Company has recognized interest income of approximately $5.6 million, $3.6 million and $2.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. The Company's policy is to record notes receivable at their unamortized cost, net of any unamortized deferred fees or costs, premiums or discounts and an allowance for loan losses. Loan fees and direct costs associated with loans originated by the Company are deferred and amortized over the term of the note as interest income.

In accordance with the 2021 Plan, and as approved by its Board of Directors, seven non-employee directors made elections to receive deferred stock units in lieu of cash fees for 2022. As a result of these elections, the aggregate cash fees otherwise payable to a non-employee director during a fiscal quarter are converted into a number of deferred stock units equal to the aggregate cash fees divided by the last reported sales price of a share of BXP’s Common Stock on the last trading of the applicable fiscal quarter. The deferred stock units are also credited with dividend equivalents as dividends are paid by BXP. The deferred stock units may be settled in shares of Common Stock upon the cessation of such director’s service on the Board of Directors of BXP. The non-employee director compensation program provides, subject to certain conditions, the non-employee directors holding deferred stock units with the ability to elect, following cessation of their service on BXP’s Board of Directors, to diversify their investment elections into non-employer securities on a pre-tax basis and receive tax-deferred returns on such deferrals, which will ultimately be settled in cash. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the non-employee director in the future. At

December 31, 2022 and 2021, the Company had maintained approximately $0.6 million and $0.9 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the non-employee director and earnings on the deferred compensation pursuant to investments elected by the non-employee director. The Company’s liability as of December 31, 2022 and 2021 was approximately $0.6 million and $0.9 million, respectively, which is included in the accompanying Consolidated Balance Sheets. The terms of the non-employee director compensation program require the classification of these deferred stock units as temporary equity on the Consolidated Balance Sheets of Boston Properties, Inc. and Boston Properties Limited Partnership within Redeemable Deferred Stock Units. On December 16, 2021, in connection with the resignation of a director’s service on the Board of Directors of BXP, BXP issued 498 shares of Common Stock in settlement of the director’s outstanding deferred stock units. At December 31, 2022 and 2021, BXP had outstanding 97,853 and 83,073 deferred stock units, respectively.

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Subsequent Events

12 Months Ended

Dec. 31, 2022

Subsequent Events [Abstract]

Subsequent Events

16. Subsequent Events

On January 4, 2023, BPLP entered into the 2023 Unsecured Term Loan, which provided for a single borrowing of up to $1.2 billion. Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions. Upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the 2022 Unsecured Term Loan, which was scheduled to mature on May 16, 2023 (see Note 7).

At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 1/2 of 1%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. Based on BPLP’s credit rating upon entry into the credit agreement, the base rate margin is 0 basis points and the Term SOFR margin is 0.85%. The 2023 Unsecured Term Loan currently bears interest at a rate equal to adjusted Term SOFR plus 0.85%.

On January 5, 2023, the Company commenced the development of 290 Binney Street, an approximately 566,000 net rentable square feet laboratory/life sciences project in Cambridge, Massachusetts. Concurrent with the commencement of this project, the Company began demolition of the existing Kendall Center Blue Parking Garage to support the development of this project. 290 Binney Street is 100% pre-leased to AstraZeneca (See Note 3).

On January 30, 2023, the Company commenced the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts. 300 Binney Street consisted of an approximately 195,000 net rentable square foot premier workplace that is being redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space. The project is 100% pre-leased to a life sciences organization.

On January 31, 2023, the Company acquired a 50% interest in a joint venture that owns 13100 and 13150 Worldgate Drive located in Herndon, Virginia for a gross purchase price of approximately $17.0 million. The acquisition was completed with available cash. 13100 and 13150 Worldgate Drive consists of two vacant office buildings aggregating approximately 350,000 rentable square feet and a 1,200-space structured parking deck situated on a 10-acre site. The joint venture intends to redevelop the property for residential use. There can be no assurance that the joint venture will commence the development on the terms currently contemplated or at all.

On January 25, 2023, BXP’s Compensation Committee approved the 2023 Multi-Year Long-Term Incentive Program (the “2023 MYLTIP”) awards under the 2021 Plan to certain executive officers of BXP. Earned awards will range from zero to a maximum of 322,053 LTIP Units depending on BXP’s relative and absolute TSR performance, with a target of approximately 161,026 LTIP Units. Under ASC 718, the 2023 MYLTIP awards have an aggregate value of approximately $13.1 million.

On February 3, 2023 and February 7, 2023, BXP issued an aggregate of 64,731 shares of restricted common stock and BPLP issued an aggregate of 401,543 LTIP Units under the 2021 Plan to certain employees of BXP.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP.’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of

approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 MYLTIP Units that had been previously granted were automatically forfeited.

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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2022

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block]

Item 15. Exhibits and Financial Statement Schedules.

(a) Financial Statement Schedule 

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances		Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
					Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,284,510	$	1,796,252	$	1,532,654	$	325,762	$	1,796,252	$	1,858,416	$	—	$	—	$	3,654,668	$	457,344	1968/2019	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		718,028		115,639		1,510,834		231		131,758		1,758,462		721,498		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		499,451		195,986		1,330,572		—		—		1,526,558		736,748		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		393,821		354,107		1,079,272		—		—		1,433,379		445,239		1961/2018	2002	(1)
601 Lexington Avenue	Office	New York, NY	987,858		241,600		494,782		515,644		289,639		962,387		—		—		1,252,026		348,892		1977/1997/2021	2001	(1)
Salesforce Tower	Office	San Francisco, CA	—		200,349		946,205		7,462		200,349		953,667		—		—		1,154,016		129,281		2018	2013	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		235,129		250,512		872,044		—		—		1,122,556		310,318		1976	2010	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		51,800		285,263		654,967		—		—		940,230		179,143		2014	2007	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		119,341		131,067		555,295		—		—		686,362		157,368		1971-1975/2017	2012	(1)
Madison Centre	Office	Seattle, WA	—		104,641		564,336		2,879		104,641		567,215		—		—		671,856		13,611		2017	2022	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		121,437		169,193		498,095		—		—		667,288		241,474		2004	2000	(1)
Carnegie Center	Office	Princeton, NJ	—		142,666		316,856		168,261		94,243		476,990		55,919		631		627,783		252,390		1983-2016	1998/1999/2000/2007/2014/2017/2019	(1)
125 Broadway	Office	Cambridge, MA	—		126,364		433,662		58		126,364		433,720		—		—		560,084		4,503		2000	2022	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		24,158		63,988		478,695		—		—		542,683		171,876		2011	2007	(1)
Reston Next	Office	Reston, VA	—		2,901		525,277		—		2,901		525,277		—		—		528,178		15,293		2022	1998	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		245,609		87,852		339,304		—		—		427,156		182,121		1986	1997	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		39,288		56,853		345,586		—		—		402,439		104,864		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		31,682		103,000		285,347		—		—		388,347		95,520		2012	2010	(1)
325 Main Street	Office	Cambridge, MA	—		21,596		312,492		—		21,596		312,492		—		—		334,088		4,308		2022	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		8,026		72,545		227,792		—		—		300,337		72,414		2014	2012	(1)
145 Broadway	Office	Cambridge, MA	—		121		273,013		26,184		23,367		275,951		—		—		299,318		26,881		2019	1997	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		113,108		104,329		192,320		—		—		296,649		71,410		2011	2008	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		28,991		13,687		266,386		—		—		280,073		98,665		2008-2009	2003	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		87,804		18,789		231,828		4,427		—		255,044		105,172		1985-1989	2011	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,852		40,934		152,229		—		—		193,163		42,776		2015	2013	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		21,270		95,066		89,643		—		—		184,709		28,575		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		55,359		20,108		156,915		1,065		—		178,088		85,394		1955/1987/2017	1997/1998	(1)

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances	Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
				Land	Building
1330 Connecticut Avenue	Office	Washington, DC	—	25,982	82,311	38,047	27,135	119,205	—	—	146,340	48,273	1984/2018	2004	(1)
One Freedom Square	Office	Reston, VA	—	9,929	84,504	51,743	11,293	134,883	—	—	146,176	66,084	2000	2003	(1)
880 Winter Street	Office	Waltham, MA	—	15,597	37,255	91,537	15,597	128,792	—	—	144,389	2,560	1998/2022	2019	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—	18,021	109,038	3,822	18,062	112,819	—	—	130,881	52,543	2003-2006	2007	(1)
140 Kendrick Street	Office	Needham, MA	—	18,095	66,905	42,528	19,092	102,625	—	5,811	127,528	41,627	2000	2004	(1)
Shady Grove Innovation District	Office	Rockville, MD	—	52,030	64,212	7,219	26,834	34,988	61,639	—	123,461	3,319	1968-1985	2021	(1)
One and Two Reston Overlook	Office	Reston, VA	—	16,456	66,192	40,516	16,179	106,985	—	—	123,164	57,631	1999	2000	(1)
Weston Corporate Center	Office	Weston, MA	—	25,753	92,312	968	25,854	93,179	—	—	119,033	38,385	2010	2001	(1)
17Fifty Presidents Street	Office	Reston, VA	—	—	113,362	162	—	113,524	—	—	113,524	12,232	2020	2013	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	21,618	12,533	92,065	—	—	104,598	54,116	2001	2003	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	25,418	21,173	76,454	—	—	97,627	34,399	1981/1996/2013	2006	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	6,406	2,290	91,821	—	—	94,111	20,616	2016	1997	(1)
Two Freedom Square	Office	Reston, VA	—	13,930	77,739	317	15,420	76,566	—	—	91,986	35,850	2001	2003	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	49,264	16,813	73,265	317	—	90,395	23,428	1999/2021	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	18,876	20,785	69,273	—	—	90,058	29,294	1983/1998/2013	2006	(1)
153 & 211 Second Avenue	Office	Waltham, MA	—	33,233	55,940	202	33,233	55,940	202	—	89,375	4,808	1964-2006	2021	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	24,604	13,807	73,809	—	—	87,616	38,306	1992	2005	(1)
20 CityPoint	Office	Waltham, MA	—	4,887	72,764	7,072	4,887	79,836	—	—	84,723	9,606	2020	2007	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	12,859	11,097	72,841	—	—	83,938	42,839	2003	1999	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	9,701	14,023	69,908	—	—	83,931	32,578	2008	2001	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	49,302	28,205	50,466	—	—	78,671	31,436	1985	1999	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	6,391	16,741	57,676	—	—	74,417	19,375	1987/2003	2011	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	1,268	18,080	51,402	1,128	—	70,610	18,995	2013	2009	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	5,579	10,148	55,423	—	—	65,571	33,822	1984	1998	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	11,204	—	64,553	—	—	64,553	26,659	2009	2004	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	33,597	548	58,293	—	—	58,841	42,204	1987	1997	(1)
University Place	Office	Cambridge, MA	—	—	37,091	15,903	5,425	47,569	—	—	52,994	35,296	1985	1998	(1)
890 Winter Street	Office	Waltham, MA	—	13,913	28,557	6,998	13,913	35,555	—	—	49,468	5,409	1999	2019	(1)
Capital Gallery	Office	Washington, DC	—	4,725	29,565	9,544	8,662	35,172	—	—	43,834	22,415	1981/2006	2007	(1)
North First Business Park	Office	San Jose, CA	—	23,398	13,069	5,288	23,378	18,377	—	—	41,755	17,270	1981	2007	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	15,726	1,323	40,295	—	—	41,618	16,841	1999	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	12,718	2,390	24,570	—	—	26,960	15,578	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	19,842	1,263	19,551	1,452	—	22,266	16,716	1982	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	546	6,492	10,489	—	—	16,981	2,308	2015	2007	(1)
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,877	3,219	12,915	—	—	16,134	3,838	2015	2012	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	11,501	425	14,576	—	—	15,001	7,929	1979	1997	(1)

Boston Properties, Inc. Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
Property Name	Type	Location	Encumbrances			Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements			Building and Improvements			Land Held for Development			Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives  (Years)
						Land		Building
Avant Retail	Office	Reston, VA	—			1,499		6,647		2,577		1,499			9,224			—			—		10,723		3,210		2014	2010	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—			594		6,748		2,297		778			8,861			—			—		9,639		7,507		1985	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—			168		1,943		6,944		314			8,741			—			—		9,055		3,103		1968/1979/1987	1997	(1)
250 Binney Street	Office	Cambridge, MA	—			110		4,483		3,593		273			7,913			—			—		8,186		6,974		1983	1997	(1)
453 Ravendale Drive	Office	Mountain View, CA	—			5,477		1,090		677		5,477			1,767			—			—		7,244		964		1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—			26		150		6,064		65			6,175			—			—		6,240		3,530		1968	1997	(1)
The Skylyne	Residential	Oakland, CA	—			28,962		239,077		1,784		28,962			240,861			—			—		269,823		14,154		2020	N/A	(1)
Signature at Reston	Residential	Reston, VA	—			27,076		190,580		1,667		27,076			192,247			—			—		219,323		23,353		2018	2013	(1)
Proto Kendall Square	Residential	Cambridge, MA	—			9,243		127,248		3,336		9,245			130,582			—			—		139,827		14,508		2018	2015	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—			3,529		54,891		2,356		3,529			57,247			—			—		60,776		17,174		2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—			478		37,918		32,837		1,201			69,521			511			—		71,233		51,568		1986/2017	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—			—		35,035		6,798		103			41,730			—			—		41,833		17,039		1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—			1,256		15,697		1,653		1,434			17,172			—			—		18,606		7,395		2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—			1,163		11,633		2,111		1,579			13,328			—			—		14,907		13,075		1990	1997	(1)
2100 Pennsylvania Avenue	Development	Washington, DC	—			—		—		472,873		185,203			230,497			—			57,173		472,873		9,755		N/A	N/A	N/A
190 CityPoint (formerly 180 CityPoint)	Development	Waltham, MA	—			—		—		140,370		—			—			—			140,370		140,370		—		N/A	2006	N/A
103 CityPoint	Development	Waltham, MA	—			—		—		44,752		—			—			74			44,678		44,752		—		N/A	2007	N/A
Reston Next Office Phase II	Development	Reston, VA	—			—		—		22,954		—			—			—			22,954		22,954		—		N/A	1998	N/A
Reston Next Retail	Development	Reston, VA	—			—		—		3,199		—			—			—			3,199		3,199		—		N/A	1998	N/A
777 Harrison Street	Land	San Francisco, CA	—			144,647		—		28,239		—			47			172,839			—		172,886		20		N/A	2020	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—			—		—		148,476		—			—			148,476			—		148,476		—		N/A	1997	N/A
Back Bay Station Master Plan	Land	Boston, MA	—			—		—		72,957		—			—			72,957			—		72,957		—		N/A	N/A	N/A
3625-3635 Peterson Way	Land	Santa Clara, CA	—			63,206		—		5,165		—			—			68,371			—		68,371		—		N/A	2016	N/A
North First Master Plan	Land	San Jose, CA	—			35,004		—		3,968		—			—			38,972			—		38,972		—		N/A	2007	N/A
Plaza at Almaden	Land	San Jose, CA	—			—		—		38,090		—			—			38,090			—		38,090		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—			—		—		19,891		—			—			19,891			—		19,891		—		N/A	2007	N/A
CityPoint South Master Plan	Land	Waltham, MA	—			—		—		19,693		—			—			19,693			—		19,693		—		N/A	N/A	N/A
Reston Gateway Master Plan	Land	Reston, VA	—			—		—		12,734		—			—			12,734			—		12,734		—		N/A	1998	N/A
Weston Quarry	Land	Weston, MA	—			—		—		1,249		—			—			1,249			—		1,249		—		N/A	2001	N/A
Broad Run Business Park	Land	Loudoun County, VA	—			—		—		1,184		—			—			1,184			—		1,184		—		N/A	1998	N/A
Reston Overlook Master Plan	Land	Reston, VA	—			—		—		80		—			—			80			—		80		—		N/A	2000	N/A
			$	3,272,368	(2)	$	5,373,987	$	14,755,092	$	5,615,135	$	5,571,327	(3)	$	19,044,812	(4)	$	721,501	(5)	$	406,574	$	25,744,214	$	6,260,992

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $50,310. Accumulated Depreciation does not include approximately $37,090 of accumulated depreciation related to Furniture, Fixtures and Equipment. Office type includes office, life sciences, and retail properties.

The aggregate cost and accumulated depreciation for tax purposes was approximately $23.1 billion and $5.0 billion, respectively.

(1)Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2)Includes unamortized deferred financing costs totaling approximately $27,632.

(3)Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

(4)Includes Right of Use Assets - Finance Leases of approximately $23,345.

(5)Includes pre-development costs.

Boston Properties, Inc.

Real Estate and Accumulated Depreciation

December 31, 2022, 2021 and 2020

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2022		2021		2020
Real Estate:
Balance at the beginning of the year	$	24,108,220	$	23,303,303	$	22,844,697
Additions to/improvements of real estate	2,228,000		1,145,084		996,989
Assets sold/written-off	(592,006)		(340,167)		(538,383)
Balance at the end of the year	$	25,744,214	$	24,108,220	$	23,303,303
Accumulated Depreciation:
Balance at the beginning of the year	$	5,848,183	$	5,501,637	$	5,239,179
Depreciation expense	646,020		623,854		573,898
Assets sold/written-off	(233,211)		(277,308)		(311,440)
Balance at the end of the year	$	6,260,992	$	5,848,183	$	5,501,637

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
					Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances		Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,284,510	$	1,796,252	$	1,532,654	$	325,762	$	1,796,252	$	1,858,416	$	—	$	—	$	3,654,668	$	457,344	1968/2019	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		658,972		100,541		1,466,876		231		131,758		1,699,406		702,725		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		437,070		180,419		1,283,758		—		—		1,464,177		716,657		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		334,213		339,200		1,034,571		—		—		1,373,771		426,148		1961/2018	2002	(1)
601 Lexington Avenue	Office	New York, NY	987,858		241,600		494,782		478,558		279,281		935,659		—		—		1,214,940		337,421		1977/1997/2021	2001	(1)
Salesforce Tower	Office	San Francisco, CA	—		200,349		946,205		7,462		200,349		953,667		—		—		1,154,016		129,281		2018	2013	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		235,129		250,512		872,044		—		—		1,122,556		310,318		1976	2010	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		51,800		285,263		654,967		—		—		940,230		179,143		2014	2007	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		119,341		131,067		555,295		—		—		686,362		157,368		1971-1975/2017	2012	(1)
Madison Centre	Office	Seattle, WA	—		104,641		564,336		2,879		104,641		567,215						671,856		13,611		2017	2022	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		83,458		159,694		469,615		—		—		629,309		229,310		2004	2000	(1)
Carnegie Center	Office	Princeton, NJ	—		142,666		316,856		153,298		90,501		465,769		55,919		631		612,820		247,525		1983-2016	1998/1999/2000/2007/2014/2017/2019	(1)
125 Broadway	Office	Cambridge, MA	—		126,364		433,662		58		126,364		433,720		—		—		560,084		4,503		2000	2022	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		24,158		63,988		478,695		—		—		542,683		171,876		2011	2007	(1)
Reston Next	Office	Reston, VA	—		2,901		525,277		—		2,901		525,277		—		—		528,178		15,293		2022	1998	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		218,367		81,040		318,874		—		—		399,914		173,396		1986	1997	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		39,288		56,853		345,586		—		—		402,439		104,864		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		31,682		103,000		285,347		—		—		388,347		95,520		2012	2010	(1)
325 Main Street	Office	Cambridge, MA	—		21,596		312,492		(193)		21,403		312,492		—		—		333,895		4,308		2022	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		8,026		72,545		227,792		—		—		300,337		72,414		2014	2012	(1)
145 Broadway	Office	Cambridge, MA	—		121		273,013		25,981		23,164		275,951		—		—		299,115		26,881		2019	1997	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		113,108		104,329		192,320		—		—		296,649		71,410		2011	2008	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		28,655		13,603		266,134		—		—		279,737		98,574		2008-2009	2003	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		87,804		18,789		231,828		4,427		—		255,044		105,172		1985-1989	2011	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,852		40,934		152,229		—		—		193,163		42,776		2015	2013	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		21,270		95,066		89,643		—		—		184,709		28,575		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		51,284		19,089		153,859		1,065		—		174,013		84,089		1955/1987/2017	1997/1998	(1)
1330 Connecticut Avenue	Office	Washington, DC	—		25,982		82,311		33,434		25,982		115,745		—		—		141,727		46,795		1984/2018	2004	(1)
One Freedom Square	Office	Reston, VA	—		9,929		84,504		46,106		9,883		130,656		—		—		140,539		64,278		2000	2003	(1)
880 Winter Street	Office	Waltham, MA	—		15,597		37,255		91,537		15,597		128,792		—		—		144,389		2,560		1998/2022	2019	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—		18,021		109,038		3,658		18,021		112,696		—		—		130,717		52,498		2003-2006	2007	(1)
140 Kendrick Street	Office	Needham, MA	—		18,095		66,905		38,538		18,095		99,632		—		5,811		123,538		40,368		2000	2004	(1)

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
				Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances	Land	Building
Shady Grove Innovation District	Office	Rockville, MD	—	52,030	64,212	7,219	26,834	34,988	61,639	—	123,461	3,319	1968-1985	2021	(1)
One and Two Reston Overlook	Office	Reston, VA	—	16,456	66,192	36,098	15,074	103,672	—	—	118,746	56,216	1999	2000	(1)
Weston Corporate Center	Office	Weston, MA	—	25,753	92,312	968	25,854	93,179	—	—	119,033	38,385	2010	2001	(1)
17Fifty Presidents Street	Office	Reston, VA	—	—	113,362	162	—	113,524	—	—	113,524	12,232	2020	2013	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	16,073	11,146	87,907	—	—	99,053	52,341	2001	2003	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	25,120	21,098	76,231	—	—	97,329	34,306	1981/1996/2013	2006	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	6,243	2,127	91,821	—	—	93,948	20,616	2016	1997	(1)
Two Freedom Square	Office	Reston, VA	—	13,930	77,739	(5,895)	13,866	71,908	—	—	85,774	33,860	2001	2003	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	46,603	16,148	71,269	317	—	87,734	22,576	1999/2021	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	18,697	20,741	69,138	—	—	89,879	29,243	1983/1998/2013	2006	(1)
153 & 211 Second Avenue	Office	Waltham, MA	—	33,233	55,940	202	33,233	55,940	202	—	89,375	4,808	1964-2006	2021	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	22,987	13,403	72,596	—	—	85,999	37,791	1992	2005	(1)
20 CityPoint	Office	Waltham, MA	—	4,887	72,764	7,072	4,887	79,836	—	—	84,723	9,606	2020	2007	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	9,872	10,350	70,601	—	—	80,951	41,883	2003	1999	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	9,596	13,997	69,829	—	—	83,826	32,548	2008	2001	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	47,222	27,685	48,906	—	—	76,591	30,773	1985	1999	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	6,391	16,741	57,676	—	—	74,417	19,375	1987/2003	2011	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	1,268	18,080	51,402	1,128	—	70,610	18,995	2013	2009	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	2,968	9,496	53,464	—	—	62,960	32,986	1984	1998	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	11,204	—	64,553	—	—	64,553	26,659	2009	2004	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	31,941	134	57,051	—	—	57,185	41,677	1987	1997	(1)
University Place	Office	Cambridge, MA	—	—	37,091	14,453	5,425	46,119	—	—	51,544	34,270	1985	1998	(1)
890 Winter Street	Office	Waltham, MA	—	13,913	28,557	6,998	13,913	35,555	—	—	49,468	5,409	1999	2019	(1)
Capital Gallery	Office	Washington, DC	—	4,725	29,565	4,882	6,128	33,044	—	—	39,172	21,506	1981/2006	2007	(1)
North First Business Park	Office	San Jose, CA	—	23,398	13,069	5,265	23,372	18,360	—	—	41,732	17,264	1981	2007	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	13,721	822	38,791	—	—	39,613	16,195	1999	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	10,611	1,862	22,991	—	—	24,853	14,898	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	19,078	1,072	18,978	1,452	—	21,502	16,474	1982	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	546	6,492	10,489	—	—	16,981	2,308	2015	2007	(1)
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,877	3,219	12,915	—	—	16,134	3,838	2015	2012	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	10,864	266	14,098	—	—	14,364	7,725	1979	1997	(1)
Avant Retail	Office	Reston, VA	—	1,499	6,647	2,577	1,499	9,224	—	—	10,723	3,210	2014	2010	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—	594	6,748	1,568	595	8,315	—	—	8,910	7,273	1985	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—	168	1,943	6,358	168	8,301	—	—	8,469	2,915	1968/1979/1987	1997	(1)
250 Binney Street	Office	Cambridge, MA	—	110	4,483	2,939	110	7,422	—	—	7,532	6,769	1983	1997	(1)

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands)
						Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements			Building and Improvements			Land Held for Development			Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances			Land		Building
453 Ravendale Drive	Office	Mountain View, CA	—			5,477		1,090		677		5,477			1,767			—			—		7,244		964		1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—			26		150		5,907		26			6,057			—			—		6,083		3,479		1968	1997	(1)
The Skylyne	Residential	Oakland, CA	—			28,962		239,077		1,784		28,962			240,861			—			—		269,823		14,154		2020	N/A	(1)
Signature at Reston	Residential	Reston, VA	—			27,076		190,580		1,667		27,076			192,247			—			—		219,323		23,353		2018	2013	(1)
Proto Kendall Square	Residential	Cambridge, MA	—			9,243		127,248		3,336		9,245			130,582			—			—		139,827		14,508		2018	2015	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—			3,529		54,891		2,356		3,529			57,247			—			—		60,776		17,174		2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—			478		37,918		29,946		478			67,353			511			—		68,342		50,642		1986/2017	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—			—		35,035		6,384		—			41,419			—			—		41,419		16,909		1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—			1,256		15,697		941		1,256			16,638			—			—		17,894		7,170		2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—			1,163		11,633		446		1,163			12,079			—			—		13,242		12,006		1990	1997	(1)
2100 Pennsylvania Avenue	Development	Washington, DC	—			—		—		472,873		185,203			230,497			—			57,173		472,873		9,755		N/A	N/A	N/A
190 CityPoint (formerly 180 CityPoint)	Development	Waltham, MA	—			—		—		140,370		—			—			—			140,370		140,370		—		N/A	2006	N/A
103 CityPoint	Development	Waltham, MA	—			—		—		44,752		—			—			74			44,678		44,752		—		N/A	2007	N/A
Reston Next Office Phase II	Development	Reston, VA	—			—		—		22,954		—			—			—			22,954		22,954		—		N/A	1998	N/A
Reston Next Retail	Development	Reston, VA	—			—		—		3,199		—			—			—			3,199		3,199		—		N/A	1998	N/A
777 Harrison Street	Land	San Francisco, CA	—			144,647		—		28,239		—			47			172,839			—		172,886		20		N/A	2020	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—			—		—		148,476		—			—			148,476			—		148,476		—		N/A	1997	N/A
Back Bay Station Master Plan	Land	Boston, MA	—			—		—		72,957		—			—			72,957			—		72,957		—		N/A	N/A	N/A
3625-3635 Peterson Way	Land	Santa Clara, CA	—			63,206		—		5,165		—			—			68,371			—		68,371		—		N/A	2016	N/A
North First Master Plan	Land	San Jose, CA	—			35,004		—		3,968		—			—			38,972			—		38,972		—		N/A	2007	N/A
Plaza at Almaden	Land	San Jose, CA	—			—		—		38,090		—			—			38,090			—		38,090		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—			—		—		19,891		—			—			19,891			—		19,891		—		N/A	2007	N/A
CityPoint South Master Plan	Land	Waltham, MA	—			—		—		19,693		—			—			19,693			—		19,693		—		N/A	N/A	N/A
Reston Gateway Master Plan	Land	Reston, VA	—			—		—		12,734		—			—			12,734			—		12,734		—		N/A	1998	N/A
Weston Quarry	Land	Weston, MA	—			—		—		1,249		—			—			1,249			—		1,249		—		N/A	2001	N/A
Broad Run Business Park	Land	Loudoun County, VA	—			—		—		1,184		—			—			1,184			—		1,184		—		N/A	1998	N/A
Reston Overlook Master Plan	Land	Reston, VA	—			—		—		80		—			—			80			—		80		—		N/A	2000	N/A
			$	3,272,368	(2)	$	5,373,987	$	14,755,092	$	5,247,621	$	5,476,618	(3)	$	18,772,007	(4)	$	721,501	(5)	$	406,574	$	25,376,700	$	6,143,384

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $50,310. Accumulated Depreciation does not include approximately $37,090 of accumulated depreciation related to Furniture, Fixtures and Equipment. Office type includes office, life sciences, and retail properties.

The aggregate cost and accumulated depreciation for tax purposes was approximately $25.7 billion and $5.6 billion, respectively.

(1)Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2)Includes unamortized deferred financing costs totaling approximately $27,632.

(3)Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

(4)Includes Right of Use Assets - Finance Leases of approximately $23,345.

(5)Includes pre-development costs.

Boston Properties Limited Partnership

Real Estate and Accumulated Depreciation

December 31, 2022, 2021 and 2020

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2022		2021		2020
Real Estate:
Balance at the beginning of the year	$	23,734,833	$	22,926,494	$	22,449,476
Additions to/improvements of real estate	2,228,000		1,145,084		996,989
Assets sold/written-off	(586,133)		(336,745)		(519,971)
Balance at the end of the year	$	25,376,700	$	23,734,833	$	22,926,494
Accumulated Depreciation:
Balance at the beginning of the year	$	5,736,240	$	5,396,111	$	5,135,289
Depreciation expense	638,538		615,553		566,813
Assets sold/written-off	(231,394)		(275,424)		(305,991)
Balance at the end of the year	$	6,143,384	$	5,736,240	$	5,396,111

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

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Comprehensive Text Block List (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying consolidated financial statements are presented using the accrual basis of accounting in conformity with accounting principles generally accepted in the United States of America. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its

own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving securities of BXP. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIEs”) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.

Consolidation, Variable Interest Entity, Policy

Variable Interest Entities (VIEs)Consolidated VIEs are those for which the Company is considered to be the primary beneficiary of a VIE. The primary beneficiary is the entity that has a controlling financial interest in the VIE, which is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and (2) the obligation to absorb losses or the right to receive the returns from the VIE that could potentially be significant to the VIE. The assets of each VIE are only available to satisfy such VIE's respective liabilities.

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Summary Of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Real Estate

Real Estate 

Upon acquisitions of real estate, the Company assesses whether the transaction should be accounted for as an asset acquisition or as a business combination by applying a screen to determine whether the integrated set of assets and activities acquired meets the definition of a business. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. The Company’s acquisitions of real estate or in-substance real estate generally will not meet the definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e. land, buildings, and related intangible assets) or because the acquisition does not include a substantive process in the form of an acquired workforce or an acquired contract that cannot be replaced without significant cost, effort or delay.

The Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenants’ credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company’s allocation to customer relationship intangible assets has been immaterial. 

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company’s Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company’s evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses. 

Management reviews its long-lived assets for indicators of impairment following the end of each quarter and when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. This evaluation of long-lived assets is dependent on a number of factors, including when there is an event or adverse change in the operating performance of the long-lived asset or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life or hold period. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. The evaluation of anticipated cash flows is subjective and is based in part on assumptions regarding anticipated hold periods, future occupancy, future rental rates, future capital requirements, discount rates and capitalization rates that could differ materially from actual results in future periods. Because cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset may be impaired, the Company’s established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company’s hold strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized, and such loss could be material. If the Company determines that an impairment has occurred, the affected assets must be reduced to their fair value. 

Guidance in Accounting Standards Codification (“ASC”) 360 “Property Plant and Equipment” requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. Discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). The components of the property’s net income that are reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by BXP’s Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that a sale of the property within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company capitalizes acquisition costs that it incurs to effect an asset acquisition and expenses acquisition costs that it incurs to effect a business combination, including legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific

component of the project that benefited from the investment. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. The Company’s capitalization policy on development properties follows the guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate-General.” The costs of land and buildings under development include specifically identifiable costs.

Capitalized costs include pre-construction costs necessary to the development of the property, development costs (including architectural, engineering and design costs), construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary for the development of the property. The Company considers a construction project as substantially complete and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed, (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction or (3) if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $52.1 million, $53.1 million and $53.9 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2022, 2021 and 2020 were approximately $16.1 million, $13.7 million and $12.9 million, respectively. 

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period. 

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. The Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations. 

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents

Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000.

Cash Held in Escrows

Cash Held in EscrowsEscrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs. Escrows also include cash held by qualified intermediaries for possible investments in like-kind exchanges in accordance with Section 1031 of the Internal Revenue Code, as amended (the “Code”), in connection with sales of the Company’s properties.

Investment in Securities

Investments in Securities The Company accounts for investments in equity securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The Company maintains deferred compensation plans that are designed to allow officers and non-employee directors of BXP to defer a portion of the officer’s current income or the non-employee director’s current compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer or non-employee director. The Company’s obligation under the plans is that of an unsecured promise to pay the deferred compensation to the plan participants in the future.

Tenant and Other Receivables and Notes Receivable

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Notes Receivable

The Company accounts for notes receivable at their unamortized cost, net of any unamortized deferred fees or costs, premiums or discounts and an allowance for loan losses. Loan fees and direct costs associated with loans originated by the Company are deferred and amortized over the term of the note as interest income.

Deferred Charges

Deferred Charges

Deferred charges include leasing costs and certain financing fees. Leasing costs include acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Unamortized leasing costs are charged to expense upon the early termination of the lease. Fully amortized deferred leasing costs are removed from the books upon the expiration of the lease. Financing fees included in deferred charges consist of external fees and costs incurred to obtain the Company’s revolving facility and if applicable, unsecured term loan and construction financing arrangements where there are not sufficient amounts outstanding to report the fees net of the debt liability. Such financing costs have been deferred and are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing. Fully amortized deferred financing costs are removed from the books upon the maturity of the debt.

External fees and costs incurred to obtain mortgage financings and unsecured senior notes have been deferred and are presented as direct deductions from the carrying amounts of the corresponding debt liability. Such financing costs are being amortized over the terms of the respective financing and included within interest expense. Unamortized financing costs are charged to expense upon the early repayment or significant modification of the financing.

Non-Real Estate Investments

Non-Real Estate InvestmentsThe Company measures its investments in non-real estate investments, which are primarily environmentally focused investment funds, at the readily determinable fair value of the investment. Changes in the fair value of these non-real estate investments are included in unrealized gain (loss) on non-real estate investments on the Consolidated Statements of Operations. The Company’s investment in non-real estate investments is shown within Prepaid and Other Assets in the Consolidated Balance Sheet. The Company recognized a net unrealized loss of approximately $0.2 million for the year ended December 31, 2022 due to the observable changes in fair value. Prior to the year ended December 31, 2022, the Company had not invested in non-real estate investments.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures 

The Company consolidates VIEs in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have substantive participating rights. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance, and (2) the obligation to absorb losses and the right to receive the returns from the variable interest entity that could potentially be significant to the VIE. For ventures that are not VIEs, the Company consolidates entities for which it has significant decision making control over the ventures’ operations. The Company’s judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company’s ownership interest, its representation in the entity’s governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company’s assessment of its influence or control over an entity affects the presentation of these investments in the Company’s consolidated financial statements. In addition to evaluating control rights,

the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member. 

Accounts of the consolidated entity are included in the accounts of the Company and the noncontrolling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company’s share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company’s recognition of joint venture income or loss generally follows the joint venture’s distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company classifies distributions received from equity method investees within its Consolidated Statements of Cash Flows using the nature of the distribution approach, which classifies the distributions received on the basis of the nature of the activity or activities of the investee that generated the distribution as either a return on investment (classified as cash inflows from operating activities) or a return of investment (classified as cash inflows from investing activities). The Company’s investments in unconsolidated joint ventures are reviewed for indicators of impairment on a quarterly basis and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying amounts has occurred and such decline is other-than-temporary. This evaluation of the investments in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. The Company will record an impairment charge if it determines that a decline in the fair value below the carrying amount of an investment in an unconsolidated joint venture is other-than-temporary. The fair value is calculated using discounted cash flows which is subjective and considers assumptions regarding future occupancy, future rental rates, future capital requirements, debt interest rates and availability, discount rates and capitalization rates that could differ materially from actual results in future periods.

To the extent that the Company contributed assets to a joint venture, the Company’s investment in the joint venture was recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 610-20 “Gains and Losses from the Derecognition of Nonfinancial Assets” (“ASC 610-20”), the Company will recognize a full gain on both the retained and sold portions of real estate contributed or sold to a joint venture by recognizing its new equity method investment interest at fair value.

The combined summarized financial information of the unconsolidated joint ventures is disclosed in Note 6.

Revenue Recognition

Revenue Recognition

In general, the Company commences lease/rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. Contractual lease/rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $108.0 million, $104.3 million and $104.9 million for the years ended December 31, 2022, 2021 and 2020, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative lease/rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements.

The Company must estimate the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of tenants’ accrued rent and accounts receivable balances, management considers tenants’ creditworthiness, current economic trends and changes in tenants’ payment patterns, on a lease-by-lease basis. The Company writes-off the tenant’s receivable balance, including the accrued rent receivable, if the Company considers the balances no longer probable of collection. In addition, tenants in bankruptcy are analyzed and considerations are made in connection with the expected recovery of pre-petition and post-petition claims. If the Company deems the balances no longer probable of collection, the Company writes

them off and ceases recognizing lease income, including straight-line rent, unless cash is received (See Note 4). Following a write-off, if (1) the Company subsequently determines that it is probable it will collect substantially all the remaining lessee’s lease payments under the lease term and (2) the lease has not been modified since the write-off, the Company will then reinstate the accrued rent and accounts receivable write-offs, adjusting for the amount related to the period when the lease payments were considered not probable of collection. If the Company’s estimates of collectability differs from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

The Company recognizes acquired in-place “above-” and “below-market” leases at their fair values as rental revenue over the original term of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $9.1 million, $4.2 million and $6.5 million for the years ended December 31, 2022, 2021 and 2020, respectively. The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2023	$	1,306	$	13,439
2024	401		9,811
2025	389		9,768
2026	389		8,647
2027	389		5,477

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred (See “Leases” ). The Company receives reimbursements of payroll and payroll related costs from unconsolidated joint venture entities and third party property owners in connection with management services contracts which the Company reflects on a gross basis instead of on a net basis as the Company has determined that it is the principal and not the agent under these arrangements in accordance with the guidance in ASC 606 “Revenue from Contracts with Customers” (“ASC 606”).

The Company’s parking revenue is derived primarily from monthly and transient daily parking. In addition, the Company has certain lease arrangements for parking accounted for under the guidance in ASC 842 “Leases” (“ASC 842”). The monthly and transient daily parking revenue falls within the scope of ASC 606 and is accounted for at the point in time when control of the goods or services transfers to the customer and the Company’s performance obligation is satisfied.

The Company’s hotel revenue is derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenue is recognized as the hotel rooms are occupied and the services are rendered to the hotel customers.

The Company earns management and development fees. Development and management services revenue is earned from unconsolidated joint venture entities and third-party property owners. The Company determined that the performance obligations associated with its development services contracts are satisfied over time and that the Company would recognize its development services revenue under the output method evenly over time from the development commencement date through the substantial completion date of the development management services project due to the stand-ready nature of the contracts. Significant judgments impacting the amount and timing of revenue recognized from the Company’s development services contracts include estimates of total development project costs from which the fees are typically derived and estimates of the period of time until substantial completion of the development project, the period of time over which the development services are required to be performed. The Company recognizes development fees earned from unconsolidated joint venture projects equal to its cost plus profit to the extent of the third party partners’ ownership interest. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 610-20. Under ASC 610-20, the Company must first determine whether the transaction is a sale to a customer or non-customer. The

Company typically sells real estate on a selective basis and not within the ordinary course of its business and therefore expects that its sale transactions will not be contracts with customers. The Company next determines whether it has a controlling financial interest in the property after the sale, consistent with the consolidation model in ASC 810 “Consolidation” (“ASC 810”). If the Company determines that it does not have a controlling financial interest in the real estate, it evaluates whether a contract exists under ASC 606 and whether the buyer has obtained control of the asset that was sold. The Company recognizes a full gain on sale of real estate when the derecognition criteria under ASC 610-20 have been met.

Lessee, Leases

Lessee

For leases in which the Company is the lessee (generally ground leases), in accordance with ASC 842 the Company recognizes a right-of-use asset and a lease liability. The Company made the policy election to not apply the requirements of ASC 842 to short-term leases. This policy election is made by class of underlying assets and as described below, the Company considers real estate to be a class of underlying assets, and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature. The Company will recognize the lease payments it pays in net income on a straight-line basis over the lease term.

The lease liability is equal to the present value of the minimum lease payments in accordance with ASC 842. The Company will use its incremental borrowing rate (“IBR”) to determine the net present value of the minimum lease payments. In order to determine the IBR, the Company utilized a market-based approach to estimate the incremental borrowing rate for each individual lease. The approach required significant judgment. Therefore, the Company utilized different data sets to estimate base IBRs via an analysis of the following weighted-components:

•the interpolated rates from yields on outstanding U.S. Treasury issuances for up to 30 years and for years 31 and beyond, longer-term publicly traded educational institution debt issued by high credit quality educational institutions with maturity dates exceeding 31 years,

•observable mortgage rates spread over U.S. Treasury issuances, and

•unlevered property yields and discount rates.

The Company then applied adjustments to account for considerations related to term and interpolated the IBR.

Lessor, Leases

Lessor

Operating Leases

The Company leases primarily premier workplaces, including office, life sciences, retail and residential space to tenants. These leases may contain extension and termination options that are predominately at the sole discretion of the tenant, provided certain conditions are satisfied. In a few instances, the leases also contain purchase options, which would be exercisable at fair market value. Also, certain of the Company’s leases include rental payments that are based on a percentage of the tenant sales in excess of contractual amounts.

Per ASC 842, lessors do not need to separate nonlease components from the associated lease component if certain criteria stated above are met for each class of underlying assets. The guidance in ASC 842 defines “underlying asset” as “an asset that is the subject of a lease for which a right to use that asset has been conveyed to a lessee. The underlying asset could be a physically distinct portion of a single asset.” Based on the above guidance, the Company considers real estate assets as a class of underlying assets and will not be further delineating it into specific uses of the real estate asset as the risk profiles are similar in nature.

Lease components are elements of an arrangement that provide the customer with the right to use an identified asset. Nonlease components are distinct elements of a contract that are not related to securing the use of the leased asset and revenue is recognized in accordance with ASC 606. The Company considers common area maintenance (CAM) and service income associated with tenant work orders to be nonlease components because they represent delivery of a separate service but are not considered a cost of securing the identified asset. In the case of the Company’s business, the identified asset would be the leased real estate (office, life sciences, retail or residential).

The Company assessed and concluded that the timing and pattern of transfer for nonlease components and the associated lease component are the same. The Company determined that the predominant component was the lease component and as such its leases will continue to qualify as operating leases and the Company has made a

policy election to account for and present the lease component and the nonlease component as a single component in the revenue section of the Consolidated Statements of Operations labeled Lease.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred. The Company recognizes these reimbursements on a gross basis, as the Company obtains control of the goods and services before they are transferred to the tenant.

In addition, in accordance with ASC 842, lessors will only capitalize incremental direct leasing costs.

Sales-Type Leases

Sales-type lease receivables are recognized when a lease qualifies as a sales-type lease. The sales-type lease receivable is initially measured at the present value of the fixed and determinable lease payments, including any guaranteed or unguaranteed residual value of the asset at the end of the lease, discounted at the rate implicit in the lease. The Company evaluates its sales-type lease receivable for impairment under the current expected credit loss standard. Interest income is recognized under the effective interest method. The effective interest method produces a constant yield on the sales-type lease receivable over the term of the lease. Income from these leases are classified as Lease Revenue within the Consolidated Statement of Operations.

Earnings Per Share and Earnings Per Common Unit

Earnings Per Share 

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of BPLP that are exchangeable for Common Stock.

Earnings Per Common Unit

Basic earnings per common unit is computed by dividing net income available to common unitholders, as adjusted for undistributed earnings (if any) of certain securities issued by BPLP, by the weighted average number of common units outstanding during the year. Diluted earnings per common unit reflects the potential dilution that could occur from units issuable in connection with awards under BXP’s stock-based compensation plans, including upon the exercise of stock options, and conversion of preferred units of BPLP.

Recurring Fair Value of Financial Instruments

Recurring Fair Value of Financial Instruments

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for December 31, 2022 and 2021, the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Sales-type lease receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading volume for the period is low, the valuation could be categorized as Level 2.

Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from those estimates.

In addition, the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.

The following table presents the aggregate carrying value of the Company’s related party note receivable, net, notes receivable, net, sales-type lease receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,576	$	79,220	$	78,336	$	82,867
Note receivable, net	—		—		9,641		10,000
Sales-type lease receivable, net	12,811		13,045		—		—
Total	$	91,387	$	92,265	$	87,977	$	92,867
Mortgage notes payable, net	$	3,272,368	$	2,744,479	$	3,267,914	$	3,395,569
Unsecured senior notes, net	10,237,968		9,135,512		9,483,695		9,966,591
Unsecured line of credit	—		—		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	14,240,336	$	12,609,991	$	12,896,609	$	13,507,477

The Company uses interest rate swap agreements to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. The Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the Consolidated Balance Sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for both the effective and ineffective portions of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the fair value of the derivative to earnings over the term that the hedged transaction affects earnings and in the same line item as the hedged transaction within the statements of operations.

During the year ended December 31, 2020, the Company elected to apply hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. The Company’s application of this expedient preserves the presentation of derivatives consistent with past presentation.

Stock-Based Employee Compensation Plans

Stock-Based Employee Compensation PlansAt December 31, 2022, the Company had a stock-based employee compensation plan. The Company accounts for the plan under the guidance in ASC 718 “Compensation – Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimates in the Preparation of Financial Statements

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as COVID-19, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.

Equity Offering Costs

Equity Offering Costs  Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital.

Treasury Stock

Treasury Stock  BXP’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity.

Dividends

Dividends  Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation.

Income Taxes

Income Taxes 

BXP has elected to be treated as a REIT under Sections 856 through 860 of the Code, commencing with its taxable year ended December 31, 1997. As a result, it generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income (with certain adjustments). BXP’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BXP’s consolidated taxable REIT subsidiaries. BXP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BXP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BXP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

The Company owns a hotel property that it leases to one of its taxable REIT subsidiaries and that is managed by Marriott International, Inc. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, if applicable, BXP has recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020. 

Certain entities included in BXP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements. 

BPLP

Income Taxes 

The partners are required to report their respective share of BPLP’s taxable income or loss on their respective tax returns and are liable for any related taxes thereon. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to BPLP’s consolidated taxable REIT subsidiaries. BPLP’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. BPLP has no uncertain tax positions recognized as of December 31, 2022 and 2021. At December 31, 2022, BPLP’s tax returns for the years 2019 forward remain subject to examination by the major tax jurisdictions under the statute of limitations.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of BPLP, is the lessee pursuant to the lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of a management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, BPLP has, if applicable, recorded a tax provision in its Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020.

Certain entities included in BPLP’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

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Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Summary Of Significant Accounting Policies [Line Items]

Property, Plant and Equipment

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2023	$	1,306	$	13,439
2024	401		9,811
2025	389		9,768
2026	389		8,647
2027	389		5,477

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Recurring Fair Value of Financial Instruments

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for December 31, 2022 and 2021, the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Sales-type lease receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading volume for the period is low, the valuation could be categorized as Level 2.

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents the aggregate carrying value of the Company’s related party note receivable, net, notes receivable, net, sales-type lease receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,576	$	79,220	$	78,336	$	82,867
Note receivable, net	—		—		9,641		10,000
Sales-type lease receivable, net	12,811		13,045		—		—
Total	$	91,387	$	92,265	$	87,977	$	92,867
Mortgage notes payable, net	$	3,272,368	$	2,744,479	$	3,267,914	$	3,395,569
Unsecured senior notes, net	10,237,968		9,135,512		9,483,695		9,966,591
Unsecured line of credit	—		—		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	14,240,336	$	12,609,991	$	12,896,609	$	13,507,477

Dividends Declared

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2022, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
December 30, 2022	January 30, 2023	$0.98	$0.98
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98
September 30, 2020	October 30, 2020	$0.98	$0.98
June 30, 2020	July 31, 2020	$0.98	$0.98
March 31, 2020	April 30, 2020	$0.98	$0.98
December 31, 2019	January 30, 2020	$0.98	$0.98

Dividend Paid [Member]

Summary Of Significant Accounting Policies [Line Items]

Dividends Declared

The tax treatment of common dividends per share for federal income tax purposes is as follows: 

	For the year ended December 31,
	2022					2021					2020
	Per Share			%		Per Share			%		Per Share			%
Ordinary income	$	3.42		86.60	%	$	2.90		73.86	%	$	2.52		64.91	%
Capital gain income	0.53			13.40	%	0.57			14.57	%	0.99			25.49	%
Return of capital	—			—	%	0.45			11.57	%	0.37			9.60	%
Total	$	3.95	(1)	100.00	%	$	3.92	(2)	100.00	%	$	3.88	(3)	100.00	%

 _____________

(1)The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.

(2)The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.

(3)The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.

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Real Estate (Tables)

12 Months Ended

Dec. 31, 2022

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BXP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,189,811	$	5,061,169
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,820,724		14,291,214
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,794,524		24,159,915
Less: Accumulated depreciation	(6,298,082)		(5,883,961)
	$	19,496,442	$	18,275,954

_______________

(1)Includes pre-development costs.

Madison Centre

Real Estate Properties [Line Items]

Asset Acquisition [Table Text Block]

The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

125 Broadway

Real Estate Properties [Line Items]

Asset Acquisition [Table Text Block]

The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

Madison Centre and 125 Broadway

Real Estate Properties [Line Items]

Schedule of Finite-Lived Intangible Assets Acquired

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre and 125 Broadway as of their acquisition dates for each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles	Acquired Above-Market Lease Intangibles	Acquired Below-Market Lease Intangible
2023	20,940	1,098	6,417
2024	19,582	254	6,386
2025	19,510	254	6,373
2026	19,046	254	6,185
2027	17,901	254	5,780

Boston Properties Limited Partnership

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BPLP

Real estate consisted of the following at December 31, 2022 and December 31, 2021 (in thousands):

	December 31, 2022		December 31, 2021
Land	$	5,095,102	$	4,964,986
Right of use assets - finance leases	237,510		237,507
Right of use assets - operating leases	167,351		169,778
Land held for future development (1)	721,501		560,355
Buildings and improvements	15,547,919		14,014,010
Tenant improvements	3,200,743		2,894,025
Furniture, fixtures and equipment	50,310		51,695
Construction in progress	406,574		894,172
Total	25,427,010		23,786,528
Less: Accumulated depreciation	(6,180,474)		(5,772,018)
	$	19,246,536	$	18,014,510

_______________

(1)Includes pre-development costs.

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Leases (Tables)

12 Months Ended

Dec. 31, 2022

Lessee, Lease, Description [Line Items]

Lease, Cost

The following table provides lease cost information for the Company’s operating and finance leases for the years ended December 31, 2022, 2021 and 2020 (in thousands):

	Year ended December 31,
Lease costs	2022		2021		2020
Operating lease costs	$	12,700	$	13,151	$	13,948
Finance lease costs
Amortization of right of use asset (1)	$	697	$	547	$	56
Interest on lease liabilities (2)	$	3,236	$	2,471	$	583

_______________

(1)The finance leases relate to either land, buildings or assets that remain in development. For land leases classified as finance leases because of a purchase option that the Company views as an economic incentive, the Company follows its existing policy and does not depreciate land because it is assumed to have an indefinite life. For all other finance leases, the Company would amortize the right of use asset over the shorter of the useful life of the asset or the lease term. If the finance lease relates to a property under development, the amortization of the right of use asset may be eligible for capitalization. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company’s policy.

(2)One, two and three of the finance leases relate to assets under development for all or a portion of the years ended December 31, 2022, December 31, 2021 and December 31, 2020, respectively, and as such, a portion of the interest amount was capitalized.

The following table provides other quantitative information for the Company’s operating and finance leases as of December 31, 2022 and December 31, 2021:

	December 31, 2022		December 31, 2021
Other information
Weighted-average remaining lease term (in years)
Operating leases	49		50
Finance leases	68		69
Weighted-average discount rate
Operating leases	5.7	%	5.7	%
Finance leases	6.2	%	6.2	%

Finance Lease, Liability, Maturity

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2022 (in thousands):

	Operating		Finance
2023	$	22,415	$	9,306
2024 (1)	22,274		49,343
2025	10,308		9,971
2026	10,100		10,166
2027	9,885		10,364
Thereafter	528,915		1,352,647
Total lease payments	603,897		1,441,797
Less:
Interest portion	399,211		1,192,462
Present value of lease payments	$	204,686	$	249,335

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2021 (in thousands):

	Operating		Finance
2022	$	19,623	$	8,762
2023	25,333		10,826
2024 (1)	10,085		48,605
2025	10,307		9,971
2026	10,100		10,166
Thereafter	538,801		1,363,011
Total lease payments	614,249		1,451,341
Less:
Interest portion	409,688		1,206,920
Present value of lease payments	$	204,561	$	244,421

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

Lessee, Operating Lease, Liability, Maturity

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2022 (in thousands):

	Operating		Finance
2023	$	22,415	$	9,306
2024 (1)	22,274		49,343
2025	10,308		9,971
2026	10,100		10,166
2027	9,885		10,364
Thereafter	528,915		1,352,647
Total lease payments	603,897		1,441,797
Less:
Interest portion	399,211		1,192,462
Present value of lease payments	$	204,686	$	249,335

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of December 31, 2021 (in thousands):

	Operating		Finance
2022	$	19,623	$	8,762
2023	25,333		10,826
2024 (1)	10,085		48,605
2025	10,307		9,971
2026	10,100		10,166
Thereafter	538,801		1,363,011
Total lease payments	614,249		1,451,341
Less:
Interest portion	409,688		1,206,920
Present value of lease payments	$	204,561	$	244,421

_______________

(1)Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

Lessor, Lease, Description [Line Items]

Operating Lease, Lease Income [Table Text Block]

Lessor

Operating Leases

The following table summarizes the components of lease revenue recognized during the years ended December 31, 2022, 2021 and 2020 included within the Company's Consolidated Statements of Operations (in thousands):

	Year ended December 31,
Lease Revenue	2022		2021		2020
Fixed contractual payments	$	2,426,007	$	2,319,362	$	2,211,915
Variable lease payments	492,361		433,652		434,346
	$	2,918,368	$	2,753,014	$	2,646,261

Lessor, Operating Lease, Payments to be Received, Maturity

The future contractual lease payments to be received (excluding operating expense reimbursements and percentage rent) by the Company as of December 31, 2022, under non-cancelable operating leases which expire on various dates through 2049 (in thousands): 

Years Ending December 31,
2023	$	2,338,610
2024	2,321,135
2025	2,279,700
2026	2,212,455
2027	2,094,014
Thereafter	13,020,102

Sales-type and Direct Financing Leases, Lease Receivable, Maturity

The following table provides the future contractual payments to be received as of December 31, 2022 (in thousands):

	Sales-Type
2023	$	—
2024	31
2025	124
2026	372
2027	756
Thereafter	268,249
Total lease payments to be received	269,532
Less:
Interest portion	256,504
Sales-type lease receivable	13,028
Unguaranteed residual asset	17
Current expected credit loss adjustment	(234)
Sales-type lease receivable, net	$	12,811

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Deferred Charges (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Deferred Costs

Deferred charges consisted of the following at December 31, 2022 and 2021 (in thousands): 

	December 31, 2022		December 31, 2021
Leasing costs, including lease related intangibles	$	1,095,231	$	1,011,229
Financing costs	19,311		19,231
	1,114,542		1,030,460
Less: Accumulated amortization	(381,260)		(411,662)
	$	733,282	$	618,798

Finite-lived Intangible Assets Amortization Expense

The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2023	$	27,659
2024	21,595
2025	21,419
2026	20,571
2027	18,214

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Investments in Unconsolidated Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Equity Method Investments [Line Items]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			December 31, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,198)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,629)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,493)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,971		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,185)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		46,839		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,414		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,366		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,716		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,465		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%	(5)	(19,921)		28,412
CA-Colorado Center, LLC	Colorado Center	50.00	%		233,862		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,152		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,397		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		164,735		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(6)	158,109		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(7)	324,038		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,000		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(8)	69,785		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(9)	114,992		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(10)	11,351		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(7)	80,714		N/A
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		120,083		N/A
					$	1,630,485	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

(2)The Company’s economic ownership has increased based on the achievement of certain return thresholds. At December 31, 2022 and December 31, 2021, the Company’s economic ownership was approximately 50%.

(3)The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.

(4)Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This property includes net equity balances from the amenity joint venture.

(6)This entity is a VIE (See Note 2).

(7)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(8)The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.

(9)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(10)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block]

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	December 31, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,537,554	$	5,579,218
Other assets	756,786		586,470
Total assets	$	7,294,340	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,022,746	$	3,214,961
Other liabilities (2)	716,271		652,135
Members’/Partners’ equity	2,555,323		2,298,592
Total liabilities and members’/partners’ equity	$	7,294,340	$	6,165,688
Company’s share of equity	$	1,238,929	$	1,104,175
Basis differentials (3)	391,556		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,630,485	$	1,445,926

_______________

(1)At December 31, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At December 31, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.2 million and $22.3 million, respectively.

(2)At December 31, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $382.2 million and $385.5 million, respectively. At December 31, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 million, respectively.

(3)This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The majority of the Company’s basis differences are as follows:

	December 31, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	301,820	$	304,776
200 Fifth Avenue	94,497		N/A
Gateway Commons	47,808		51,009
Dock 72	(98,980)		(50,051)

These basis differentials (excluding land) will be amortized over the remaining lives of the related assets and liabilities.

(4)Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

Statements Of Operations Of The Joint Ventures

The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows: 

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Total revenue (1)	$	512,078	$	383,649	$	319,560
Expenses
Operating	198,632		158,498		144,347
Transaction costs	837		470		1,027
Depreciation and amortization	181,041		147,121		141,853
Total expenses	380,510		306,089		287,227
Other income (expense)
Loss from early extinguishment of debt	(1,327)		—		—
Interest expense	(154,065)		(108,884)		(98,051)
Unrealized gain on derivative instruments	1,681		—		—
Gains on sales of real estate (2)	—		—		11,737
Net loss	$	(22,143)	$	(31,324)	$	(53,981)
Company’s share of net loss	$	(2,551)	$	(10,254)	$	(16,256)
Gain on sale of investment (3)	—		10,257		—
Impairment loss on investment (4)	(50,705)		—		(60,524)
Basis differential (5)	(6,584)		(2,573)		(8,330)
Loss from unconsolidated joint ventures	$	(59,840)	$	(2,570)	$	(85,110)

_______________ 

(1)Includes straight-line rent adjustments of approximately $62.9 million, $17.2 million and $(10.1) million for the years ended December 31, 2022, 2021 and 2020, respectively.

(2)For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

(3)During the year ended December 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.

(4)During the years ended December 31, 2022 and December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million and $60.5 million, respectively.

(5)Includes straight-line rent adjustments of approximately $0.5 million, $0.8 million and $1.8 million for the years ended December 31, 2022, 2021 and 2020, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million, $0.4 million and $0.9 million for the years ended December 31, 2022, 2021 and 2020, respectively.

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Debt (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Schedule Of Aggregate Principal Payments On Mortgage Notes

Contractual aggregate principal payments of mortgage notes payable at December 31, 2022 are as follows (dollars in thousands): 

	Principal Payments
2023	$	—
2024	—
2025	—
2026	—
2027	2,300,000
Thereafter	1,000,000
Total aggregate principal payments	3,300,000
Less:
Deferred financing costs, net	27,632
Total carrying value of mortgage notes payable, net	$	3,272,368

Schedule of Long-term Debt Instruments

The following summarizes the unsecured senior notes outstanding as of December 31, 2022 (dollars in thousands): 

	Coupon/Stated Rate		Effective Rate(1)		Principal Amount		Maturity Date(2)
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	$	500,000	September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000		February 1, 2024
7 Year Unsecured Senior Notes	3.200	%	3.350	%	850,000		January 15, 2025
10 Year Unsecured Senior Notes	3.650	%	3.766	%	1,000,000		February 1, 2026
10 Year Unsecured Senior Notes	2.750	%	3.495	%	1,000,000		October 1, 2026
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
10 Year Unsecured Senior Notes	4.500	%	4.628	%	1,000,000		December 1, 2028
10 Year Unsecured Senior Notes	3.400	%	3.505	%	850,000		June 21, 2029
10.5 Year Unsecured Senior Notes	2.900	%	2.984	%	700,000		March 15, 2030
10.75 Year Unsecured Senior Notes	3.250	%	3.343	%	1,250,000		January 30, 2031
11 Year Unsecured Senior Notes	2.550	%	2.671	%	850,000		April 1, 2032
12 Year Unsecured Senior Notes	2.450	%	2.524	%	850,000		October 1, 2033
Total principal					10,300,000
Less:
Net unamortized discount					14,094
Deferred financing costs, net					47,938
Total					$	10,237,968

_______________

(1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

(2)No principal amounts are due prior to maturity.

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Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2022

Noncontrolling Interest [Line Items]

Distribution Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2022, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
December 30, 2022	January 30, 2023	$0.98	$0.98
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98
September 30, 2020	October 30, 2020	$0.98	$0.98
June 30, 2020	July 31, 2020	$0.98	$0.98
March 31, 2020	April 30, 2020	$0.98	$0.98
December 31, 2019	January 30, 2020	$0.98	$0.98

Noncontrolling Interests [Member]

Noncontrolling Interest [Line Items]

Distribution Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the year ended December 31, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 30, 2022	January 30, 2023	$0.98	$0.098
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the year ended December 31, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2021	January 28, 2022	$0.98	$0.098
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2016 MYLTIP Units and, after the February 6, 2020 measurement date, the 2017 MYLTIP Units) and its distributions on the 2017 MYLTIP Units (prior to the February 6, 2020 measurement date) and 2018 - 2020 MYLTIP Units (after the February 4, 2020 issuance date of the 2020 MYLTIP Units) that occurred during the year ended December 31, 2020:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
December 31, 2020	January 28, 2021	$0.98	$0.098
September 30, 2020	October 30, 2020	$0.98	$0.098
June 30, 2020	July 31, 2020	$0.98	$0.098
March 31, 2020	April 30, 2020	$0.98	$0.098
December 31, 2019	January 30, 2020	$0.98	$0.098

XML

Stockholders' Equity / Partners' Capital (Tables)

12 Months Ended

Dec. 31, 2022

Class of Stock [Line Items]

Dividends Declared [Table Text Block]

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2022, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
December 30, 2022	January 30, 2023	$0.98	$0.98
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98
September 30, 2020	October 30, 2020	$0.98	$0.98
June 30, 2020	July 31, 2020	$0.98	$0.98
March 31, 2020	April 30, 2020	$0.98	$0.98
December 31, 2019	January 30, 2020	$0.98	$0.98

Series B Preferred Stock [Member]

Class of Stock [Line Items]

Dividends Declared [Table Text Block]

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the years ended December 31, 2021 and 2020:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125
November 4, 2020	November 16, 2020	$32.8125
August 3, 2020	August 17, 2020	$32.8125
May 1, 2020	May 15, 2020	$32.8125
February 4, 2020	February 18, 2020	$32.8125

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2022

Segment Reporting [Abstract]

Schedule Of Reconciliation Of Net Operating Income To Net Income

BXP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	$	496,223	$	862,227
Add:
Preferred stock redemption charge	—		6,412		—
Preferred dividends	—		2,560		10,500
Noncontrolling interest—common units of the Operating Partnership	96,780		55,931		97,704
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	749,775		717,336		683,751
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	437,019		123,660		618,982
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

BPLP

	Year ended December 31,
	2022		2021		2020
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	$	561,993	$	979,979
Add:
Preferred unit redemption charge	—		6,412		—
Preferred distributions	—		2,560		10,500
Noncontrolling interests in property partnerships	74,857		70,806		48,260
Interest expense	437,139		423,346		431,717
Losses from early extinguishment of debt	—		45,182		—
Unrealized loss on non-real estate investment	150		—		—
Net operating income from unconsolidated joint ventures	146,081		107,756		94,943
Loss from unconsolidated joint ventures	59,840		2,570		85,110
Depreciation and amortization expense	742,293		709,035		676,666
Transaction costs	2,905		5,036		1,531
Payroll and related costs from management services contracts	15,450		12,487		11,626
General and administrative expense	146,378		151,573		133,112
Less:
Net operating income attributable to noncontrolling interests in property partnerships	191,812		186,304		162,887
Gains (losses) from investments in securities	(6,453)		5,626		5,261
Other income - assignment fee	6,624		—		—
Interest and other income (loss)	11,940		5,704		5,953
Gain on sales-type lease	10,058		—		—
Gains on sales of real estate	441,075		125,198		631,945
Direct reimbursements of payroll and related costs from management services contracts	15,450		12,487		11,626
Development and management services revenue	28,056		27,697		29,641
Company’s share of Net Operating Income	$	1,883,796	$	1,735,740	$	1,626,131

Schedule Of Segment Information By Geographic Area And Property Type

Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	1,005,156		$	—		$	1,031,479		$	534,397		$	31,978		$	365,402		$	2,968,412
Residential	15,086			—			—			14,769			—			27,326			57,181
Hotel	39,482			—			—			—			—			—			39,482
Total	1,059,724			—			1,031,479			549,166			31,978			392,728			3,065,075
% of Grand Totals	34.58		%	—		%	33.65		%	17.92		%	1.04		%	12.81		%	100.00		%
Rental Expenses:
Premier Workplace	360,218			—			391,293			183,353			8,386			135,237			1,078,487
Residential	5,961			—			—			11,371			—			12,251			29,583
Hotel	27,478			—			—			—			—			—			27,478
Total	393,657			—			391,293			194,724			8,386			147,488			1,135,548
% of Grand Totals	34.66		%	—		%	34.46		%	17.15		%	0.74		%	12.99		%	100.00		%
Net operating income	$	666,067		$	—		$	640,186		$	354,442		$	23,592		$	245,240		$	1,929,527
% of Grand Totals	34.52		%	—		%	33.18		%	18.37		%	1.22		%	12.71		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(45,822)			—			(145,990)			—			—			—			(191,812)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	34,233			53,023			1,594			12,785			7,690			36,756			146,081
Company’s share of net operating income	$	654,478		$	53,023		$	495,790		$	367,227		$	31,282		$	281,996		$	1,883,796
% of Grand Totals	34.75		%	2.81		%	26.32		%	19.49		%	1.66		%	14.97		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

For the year ended December 31, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	930,560		$	—		$	1,012,172		$	508,620		$	—			$	340,808		$	2,792,160
Residential	13,397			—			—			3,892			—				25,379			42,668
Hotel	13,609			—			—			—			—				—			13,609
Total	957,566			—			1,012,172			512,512			—				366,187			2,848,437
% of Grand Totals	33.62		%	—		%	35.53		%	17.99		%	—		%		12.86		%	100.00		%
Rental Expenses:
Premier Workplace	322,298			—			379,267			168,040			—				127,102			996,707
Residential	5,811			—			—			6,717			—				11,916			24,444
Hotel	12,998			—			—			—			—				—			12,998
Total	341,107			—			379,267			174,757			—			—	139,018			1,034,149
% of Grand Totals	32.98		%	—		%	36.67		%	16.90		%	—		%		13.45		%	100.00		%
Net operating income	$	616,459		$	—		$	632,905		$	337,755		$	—			$	227,169		$	1,814,288
% of Grand Totals	33.98		%	—		%	34.88		%	18.62		%	—		%		12.52		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(43,232)			—			(143,072)			—			—				—			(186,304)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	16,551			51,641			(664)			14,152			2,498				23,578			107,756
Company’s share of net operating income	$	589,778		$	51,641		$	489,169		$	351,907		$	2,498			$	250,747		$	1,735,740
% of Grand Totals	33.98		%	2.98		%	28.18		%	20.27		%	0.14		%		14.45		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

For the year ended December 31, 2020:

	Boston			Los Angeles			New York			San Francisco			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	897,915		$	—		$	935,966		$	508,327		$	336,587		$	2,678,795
Residential	13,616			—			—			155			24,375			38,146
Hotel	7,478			—			—			—			—			7,478
Total	919,009			—			935,966			508,482			360,962			2,724,419
% of Grand Totals	33.73		%	—		%	34.36		%	18.66		%	13.25		%	100.00		%
Rental Expenses:
Premier Workplace	318,509			—			384,753			163,156			132,051			998,469
Residential	5,378			—			—			2,261			11,100			18,739
Hotel	13,136			—			—			—			—			13,136
Total	337,023			—			384,753			165,417			143,151			1,030,344
% of Grand Totals	32.71		%	—		%	37.35		%	16.05		%	13.89		%	100.00		%
Net operating income	$	581,986		$	—		$	551,213		$	343,065		$	217,811		$	1,694,075
% of Grand Totals	34.35		%	—		%	32.54		%	20.25		%	12.86		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(41,849)			—			(121,038)			—			—			(162,887)
Add: Company’s share of net operating income from unconsolidated joint ventures	10,765			57,907			(5,326)			14,928			16,669			94,943
Company’s share of net operating income	$	550,902		$	57,907		$	424,849		$	357,993		$	234,480		$	1,626,131
% of Grand Totals	33.88		%	3.56		%	26.12		%	22.02		%	14.42		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Earnings Per Share / Common Unit (Tables)

12 Months Ended

Dec. 31, 2022

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

	Year ended December 31, 2022
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,947	156,726	$	5.42
Allocation of undistributed earnings to participating securities	(891)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	848,056		156,726	5.41
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	848,056	157,137	$	5.40
	Year ended December 31, 2021
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,116	$	3.18
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	496,223	156,376	$	3.17
	Year ended December 31, 2020
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	862,227	155,432	$	5.55
Allocation of undistributed earnings to participating securities	(748)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,432	$	5.54
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	861,479	155,517	$	5.54

Boston Properties Limited Partnership

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

	Year ended December 31, 2022
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	957,265	174,360	$	5.49
Allocation of undistributed earnings to participating securities	(991)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,360	$	5.48
Effect of Dilutive Securities:
Stock Based Compensation	—		411	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	956,274	174,771	$	5.47
	Year ended December 31, 2021
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Allocation of undistributed earnings to participating securities	—		—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,150	$	3.25
Effect of Dilutive Securities:
Stock Based Compensation	—		260	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	561,993	173,410	$	3.24

	Year ended December 31, 2020
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,979	172,643	$	5.68
Allocation of undistributed earnings to participating securities	(830)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,643	$	5.67
Effect of Dilutive Securities:
Stock Based Compensation	—		85	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	979,149	172,728	$	5.67

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Stock Option and Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2022

Text Block [Abstract]

Share-based Payment Arrangement, Option, Activity

A summary of the status of BXP’s stock options as of December 31, 2022, 2021 and 2020 and changes during the years then ended are presented below:

	Shares	Weighted-Average Exercise Price
Outstanding at December 31, 2019	395,353	$	96.37
Exercised	(43,792)	$	91.60
Outstanding at December 31, 2020	351,561	$	96.97
Exercised	(247,920)	$	96.95
Outstanding at December 31, 2021	103,641	$	97.01
Exercised	—	$	—
Outstanding at December 31, 2022	103,641	$	97.01

Schedule of Stock Options Outstanding

The following table summarizes information about BXP’s stock options outstanding at December 31, 2022: 

Options Outstanding				Options Exercisable
Number Outstanding at 12/31/22	Weighted-Average Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/22	Exercise Price
54,282	0.3 years	$	95.69	54,282	$	95.69
49,359	0.1 years	$	98.46	49,359	$	98.46

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Organization (Details) ft² in Millions		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022 ft² Real_Estate_Properties yr shares
Real Estate Properties [Line Items]
Restriction on redemption of OP units from date of issuance (years) | yr		1
One OP unit is equivalent to one share of Common Stock (in shares) | shares		1
OP unit conversion rate (in shares) | shares		1
Number of VIEs		7
Variable Interest Entity, Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Number of VIEs		6
Variable Interest Entity, Primary Beneficiary [Member] | Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of VIEs		5
Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		13
Net Rentable Area (in sf) | ft²		3.2
Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties		194
Net Rentable Area (in sf) | ft²		54.1
Office Building [Member]
Real Estate Properties [Line Items]
Number of real estate properties		173
Office Building [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		10
Retail Site [Member]
Real Estate Properties [Line Items]
Number of real estate properties		14
Retail Site [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		2
Residential Building
Real Estate Properties [Line Items]
Number of real estate properties		6
Residential Building | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		1
Hotel [Member]
Real Estate Properties [Line Items]
Number of real estate properties		1
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
General and limited partnership interest in the operating partnership (percent)	89.70%	89.60%

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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Interest capitalized	$ 52,130,000	$ 53,097,000	$ 53,881,000
Salaries And Related Costs Capitalized	16,100,000	13,700,000	12,900,000
Cash FDIC Insured Limit	250,000
Separate Unrestricted Cash For Deferred Compensation Plan.	32,300,000	43,600,000
Gains (losses) from investments in securities	$ (6,453,000)	5,626,000	5,261,000
Accounts Receivable, Collection Period Expected	1
Straight Line Rent Adjustments	$ 108,000,000	104,300,000	104,900,000
Above and below market rent adjustments, net	$ 9,100,000	4,200,000	6,500,000
REIT Distribution Requirement	90.00%
Company's Taxable Income Distribution	100.00%
Unrealized Gain (Loss) on Investments	$ (150,000)	$ 0	$ 0
Environmental Focused Investment Fund
Summary Of Significant Accounting Policies [Line Items]
Unrealized Gain (Loss) on Investments	$ (200,000)

XML

Summary Of Significant Accounting Policies Schedule of Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2022
Tenant improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Shorter of useful life or terms of related lease
Minimum [Member] | Land Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Minimum [Member] | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum [Member] | Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Land Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years

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Schedule of Finite Lived Intagible Assets Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
2023	$ 27,659
2024	21,595
2025	21,419
2026	20,571
2027	18,214
Above Market Lease Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2023	1,306
2024	401
2025	389
2026	389
2027	389
Below Market Lease [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2023	13,439
2024	9,811
2025	9,768
2026	8,647
2027	$ 5,477

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Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	May 17, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	$ 78,576		$ 78,336
Notes receivable, net	0		9,641
Sales-type lease receivable, net	12,811		0
Mortgage notes payable, net	3,272,368		3,267,914
Unsecured senior notes, net	10,237,968		9,483,695
Unsecured line of credit	0		145,000
Unsecured term loan, net	730,000	$ 730,000	0
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	78,576		78,336
Notes receivable, net	0		9,641
Sales-type lease receivable, net	12,811		0
Total	91,387		87,977
Mortgage notes payable, net	3,272,368		3,267,914
Unsecured senior notes, net	10,237,968		9,483,695
Unsecured line of credit	0		145,000
Unsecured term loan, net	730,000		0
Total	14,240,336		12,896,609
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	79,220		82,867
Notes receivable, net	0		10,000
Sales-type lease receivable, net	13,045		0
Total	92,265		92,867
Mortgage notes payable, net	2,744,479		3,395,569
Unsecured senior notes, net	9,135,512		9,966,591
Unsecured line of credit	0		145,317
Unsecured term loan, net	730,000		0
Total	$ 12,609,991		$ 13,507,477

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Summary Of Significant Accounting Policies of Tax Treatment of Common Dividends Per Share for Federal Tax Purposes (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020		Dec. 19, 2022
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.	$ 3.95	[1]	$ 3.92	[2]	$ 3.88	[3]
Dividends Treatment For Federal Tax Purposes, Percentage	100.00%		100.00%		100.00%
Distributions Payable, Amount Per Unit							$ 0.98
Ordinary income
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.	$ 3.42		$ 2.90		$ 2.52
Dividends Treatment For Federal Tax Purposes, Percentage	86.60%		73.86%		64.91%
Capital Gain Income
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.	$ 0.53		$ 0.57		$ 0.99
Dividends Treatment For Federal Tax Purposes, Percentage	13.40%		14.57%		25.49%
Return of Capital
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.	$ 0		$ 0.45		$ 0.37
Dividends Treatment For Federal Tax Purposes, Percentage	0.00%		11.57%		9.60%
Dividend Declared
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit	$ 0.98		$ 0.98		$ 0.98
Allocated to 2022
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit	0.03
Allocated to 2023
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit	$ 0.95

[1] The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.

[2] The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.

[3] The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.

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Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Real Estate Properties [Line Items]
Land		$ 5,189,811	$ 5,061,169
Right-of-use assets - finance leases		237,510	237,507
Right of use assets - operating leases		167,351	169,778
Land held for future development	[1]	721,501	560,355
Buildings and improvements		15,820,724	14,291,214
Tenant improvements		3,200,743	2,894,025
Furniture, Fixtures and Equipment		50,310	51,695
Construction in progress		406,574	894,172
Total		25,794,524	24,159,915
Less: accumulated depreciation		(6,298,082)	(5,883,961)
Total real estate		19,496,442	18,275,954
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Land		5,095,102	4,964,986
Right-of-use assets - finance leases		237,510	237,507
Right of use assets - operating leases		167,351	169,778
Land held for future development	[1]	721,501	560,355
Buildings and improvements		15,547,919	14,014,010
Tenant improvements		3,200,743	2,894,025
Furniture, Fixtures and Equipment		50,310	51,695
Construction in progress		406,574	894,172
Total		25,427,010	23,786,528
Less: accumulated depreciation		(6,180,474)	(5,772,018)
Total real estate		$ 19,246,536	$ 18,014,510

[1] Includes pre-development costs.

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Real Estate Asset Acquisition (Details) - USD ($) $ in Thousands	Sep. 16, 2022	May 17, 2022
Madison Centre
Asset Acquisition [Line Items]
Land		$ 104,641
Building and improvements		505,766
Tenant Improvements		58,570
Net Assets Acquired		724,255
Madison Centre | In-Place Lease Intangibles
Asset Acquisition [Line Items]
Lease Intangibles		74,598
Madison Centre | Above Market Lease Intangibles [Member]
Asset Acquisition [Line Items]
Lease Intangibles		3,794
Madison Centre | Below Market Lease Intangible [Member]
Asset Acquisition [Line Items]
Lease Intangibles		$ (23,114)
125 Broadway
Asset Acquisition [Line Items]
Land	$ 126,364
Building and improvements	403,588
Tenant Improvements	30,074
Net Assets Acquired	592,438
125 Broadway | In-Place Lease Intangibles
Asset Acquisition [Line Items]
Lease Intangibles	49,137
125 Broadway | Below Market Lease Intangible [Member]
Asset Acquisition [Line Items]
Lease Intangibles	$ (16,725)

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Real Estate Amortization of Finite Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 16, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
2023	$ 27,659
2024	21,595
2025	21,419
2026	20,571
2027	18,214
Above Market Lease Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2023	1,306
2024	401
2025	389
2026	389
2027	$ 389
Madison Centre and 125 Broadway | In-Place Lease Intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
2023		$ 20,940
2024		19,582
2025		19,510
2026		19,046
2027		17,901
Madison Centre and 125 Broadway | Above Market Lease Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2023		1,098
2024		254
2025		254
2026		254
2027		254
Madison Centre and 125 Broadway | Below Market Lease Intangible [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2023		6,417
2024		6,386
2025		6,373
2026		6,185
2027		$ 5,780

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Real Estate (Narrative) (Details) $ in Thousands													3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended	8 Months Ended	10 Months Ended	12 Months Ended
	Nov. 08, 2022 USD ($) ft² floor	Oct. 19, 2022 ft² Building	Sep. 16, 2022 USD ($) ft²	Sep. 15, 2022 USD ($) land_parcel	Aug. 30, 2022 USD ($) ft²	Jul. 01, 2022 ft² Building	Jun. 15, 2022 USD ($) ft² Building	May 17, 2022 USD ($) ft² floor	Apr. 27, 2022 ft² Building	Apr. 07, 2022 USD ($)	Mar. 31, 2022 USD ($) ft²	Apr. 19, 2021 USD ($) a ft²	Mar. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) ft²	Jun. 14, 2022 USD ($)	Dec. 31, 2022 USD ($) ft²	Aug. 29, 2022 USD ($)	Nov. 07, 2022 USD ($)	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 23, 2022 ft²	Dec. 01, 2022 ft²	Nov. 30, 2022 ft²	Sep. 12, 2022 ft²	Sep. 08, 2022 ft²	Jun. 29, 2022 ft²	May 13, 2022 ft²	Apr. 29, 2022 ft²	May 09, 2019 ft²
Real Estate Properties [Line Items]
Unsecured term loan								$ 730,000						$ 730,000		$ 730,000			$ 730,000	$ 0
Total revenue																			3,108,581	2,888,621	$ 2,765,686
Net income																			1,020,584	631,932	1,018,691
Proceeds from sales of real estate																			834,770	179,887	519,303
Interest and Other Income																			11,940	5,704	5,953
Other income - assignment fee																			$ 6,624	0	0
Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²														3,200,000		3,200,000			3,200,000
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Unsecured term loan														$ 730,000		$ 730,000			$ 730,000	0
Total revenue																			3,108,581	2,888,621	2,765,686
Net income																			1,032,122	641,771	1,038,739
Proceeds from sales of real estate																			834,770	179,887	519,303
Interest and Other Income																			11,940	5,704	5,953
Other income - assignment fee																			$ 6,624	0	0
Madison Centre
Real Estate Properties [Line Items]
Noncash or Part Noncash Acquisition, Value of Assets Acquired								$ 724,300
Net Rentable Area (in sf) | ft²								755,000
Number of floors | floor								37
Total revenue																32,000
Net income																$ 2,100
125 Broadway
Real Estate Properties [Line Items]
Payments to Acquire Real Estate			$ 592,400
Net Rentable Area (in sf) | ft²			271,000
Total revenue														11,400
Net income														$ 3,300
195 West Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²											63,500
Net income													$ 400							500	(800)
Contractual Sales Price											$ 37,700
Proceeds from sales of real estate											35,400
Gains (Losses) on Sales of Investment Real Estate											22,700
195 West Street | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate											$ 23,400
11251 Roger Bacon Drive
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²												65,000
Asset Acquisition, Price of Acquisition, Expected												$ 5,600
Interest and Other Income										$ 6,900
Other income - assignment fee										$ 6,600
Area of Land | a												2.6
Virginia 95 Office Park
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²							733,000
Net income															$ 2,300					7,000	7,800
Contractual Sales Price							$ 127,500
Proceeds from sales of real estate							121,900
Gains (Losses) on Sales of Investment Real Estate							$ 96,200
Number of buildings | Building							11
Virginia 95 Office Park | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate							$ 99,500
601 Massachusetts Avenue
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²					479,000
Net income																	$ 14,900			22,400	21,800
Contractual Sales Price					$ 531,000
Proceeds from sales of real estate					512,300
Gains (Losses) on Sales of Investment Real Estate					237,400
601 Massachusetts Avenue | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate					$ 237,500
Loudoun County Land
Real Estate Properties [Line Items]
Contractual Sales Price				$ 27,000
Proceeds from sales of real estate				25,600
Gains (Losses) on Sales of Investment Real Estate				$ 24,400
Parcels of undeveloped land | land_parcel				2
The Avant at Reston Town Center
Real Estate Properties [Line Items]
Net income																		$ 4,100		$ 4,000	$ 4,000
The Avant at Reston Town Center | Residential Building
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²	329,000
Number of floors | floor	15
Contractual Sales Price	$ 141,000
Proceeds from sales of real estate	139,600
Gains (Losses) on Sales of Investment Real Estate	$ 55,600
Number of Units in Real Estate Property	359
The Avant Retail | Retail Site [Member]
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²	26,000
290 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²									566,000
Lessor, Operating Lease, Lease Not yet Commenced, Description									15-year
Kendall Center future development | Scenario, Plan
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²									1,100,000
Number of buildings | Building									2
Kendall Center future development | Scenario, Plan | Residential Building
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²									400,000
2100 Pennsylvania Avenue
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																													480,000
Reston Next Office Phase II
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																												90,000
325 Main Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																											414,000			115,000
140 Kendrick Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²						388,000
Number of buildings | Building						3
140 Kendrick - Building A
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²						90,000
Number of buildings | Building						1
140 Kendrick - Building A | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²						104,000
300 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																										195,000
300 Binney Street | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																										240,000
760 Boylston Street [Member] | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																									118,000
Reston Next
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²		1,100,000
Number of buildings | Building		2
105 Carnegie Center
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																								70,000
105 Carnegie Center | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																								73,000
2096 Gaither Road
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																							50,000
880 Winter Street [Member]
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																						244,000

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Leases Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Lessor, Lease, Description [Line Items]
Write-off (reinstatement) for accrued rent and accounts receivables	$ (1,500)	$ 1,300	$ 90,300
Number of Properties Subject to Ground Leases		4
Property Subject to Operating Lease
Lessor, Lease, Description [Line Items]
Number of Properties Subject to Ground Leases	4	4	4

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Lessee, Lease Cost and Other Information (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease costs		$ 12,700	$ 13,151	$ 13,948
Amortization of right-of-use asset	[1]	697	547	56
Interest on lease liabilities	[2]	$ 3,236	$ 2,471	$ 583
Operating leases, Weighted-average remaining lease term		49 years	50 years
Finance leases, Weighted-average remaining lease term		68 years	69 years
Operating leases, Weighted-average discount rate		5.70%	5.70%
Finance leases, Weighted-average discount rate		6.20%	6.20%
Finance leases under development		1	2	3

[1] The finance leases relate to either land, buildings or assets that remain in development. For land leases classified as finance leases because of a purchase option that the Company views as an economic incentive, the Company follows its existing policy and does not depreciate land because it is assumed to have an indefinite life. For all other finance leases, the Company would amortize the right of use asset over the shorter of the useful life of the asset or the lease term. If the finance lease relates to a property under development, the amortization of the right of use asset may be eligible for capitalization. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company’s policy.

[2] One, two and three of the finance leases relate to assets under development for all or a portion of the years ended December 31, 2022, December 31, 2021 and December 31, 2020, respectively, and as such, a portion of the interest amount was capitalized.

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Lease Liability Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2023	$ 22,415		$ 19,623
2024	22,274		25,333
2025	10,308		10,085
2026	10,100		10,307
2027	9,885		10,100
Thereafter	528,915		538,801
Total lease payments	603,897		614,249
Less: Interest Portion	399,211		409,688
Present value of lease payments	204,686		204,561
Finance Lease, Liability, Payment, Due [Abstract]
2023	9,306		8,762
2024	49,343	[1]	10,826
2025	9,971		48,605	[1]
2026	10,166		9,971
2027	10,364		10,166
Thereafter	1,352,647		1,363,011
Total lease payments	1,441,797		1,451,341
Less: Interest Portion	1,192,462		1,206,920
Lease liabilities - finance leases	249,335		244,421
Lessee, Lease, Description [Line Items]
Lessee purchase option reasonably certain of exercising	$ 38,700		$ 38,700

[1] Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

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Lease Liability Maturity Detail Prior Year (Details) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2022	$ 22,415		$ 19,623
2023	22,274		25,333
2024	10,308		10,085
2025	10,100		10,307
2026	9,885		10,100
Thereafter	528,915		538,801
Total lease payments	603,897		614,249
Less: Interest Portion	399,211		409,688
Present value of lease payments	204,686		204,561
Finance Lease, Liability, Payment, Due [Abstract]
2022	9,306		8,762
2023	49,343	[1]	10,826
2024	9,971		48,605	[1]
2025	10,166		9,971
2026	10,364		10,166
Thereafter	1,352,647		1,363,011
Total lease payments	1,441,797		1,451,341
Less: Interest Portion	1,192,462		1,206,920
Present value of lease payments	$ 249,335		$ 244,421

[1] Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.

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Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Fixed contractual payments	$ 2,426,007	$ 2,319,362	$ 2,211,915
Variable lease payments	492,361	433,652	434,346
Lease	$ 2,918,368	$ 2,753,014	$ 2,646,261

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Future Minimum Rent (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2023	$ 2,338,610
2024	2,321,135
2025	2,279,700
2026	2,212,455
2027	2,094,014
Thereafter	$ 13,020,102
Schedule of Future Minimum Lease Payments
Number Of Tenants Above Concentration Amount.	0	0	0
Revenue Benchmark [Member] | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%

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Lessor Leases Narrative (Details)		12 Months Ended
	Dec. 19, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 29, 2020 ft² room
Lessor, Lease, Description [Line Items]
Sales-type lease receivable, net	$ 13,000,000	$ 13,028,000
Sales-type Lease, Unguaranteed Residual Asset	17,000	17,000
Gain on sales-type lease	$ 10,100,000	$ 10,058,000	$ 0	$ 0
Third-party hotel developer
Lessor, Lease, Description [Line Items]
Number of Units in Real Estate Property | room					267
Net Rentable Area (in sf) | ft²					241,000
Land
Lessor, Lease, Description [Line Items]
Lessor, Sales-type Lease, Term of Contract					99 years

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Sales Type Lease Maturity Schedule (Details) - USD ($)	Dec. 31, 2022	Dec. 19, 2022	Dec. 31, 2021
Sales-Type and Direct Financing Leases, Lease Receivable, Payments to be Received, Fiscal Year Maturity [Abstract]
2023	$ 0
2024	31,000
2025	124,000
2026	372,000
2027	756,000
Thereafter	268,249,000
Total lease payments to be received	269,532,000
Interest portion	256,504,000
Sales-type lease receivable, net	13,028,000	$ 13,000,000
Sales-type Lease, Unguaranteed Residual Asset	17,000	$ 17,000
Sales-type Lease, Net Investment in Lease, Allowance for Credit Loss	(234,000)
Sales-type lease receivable, net	$ 12,811,000		$ 0

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Deferred Charges (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Leasing costs, including lease related intangibles	$ 1,095,231	$ 1,011,229
Financing costs	19,311	19,231
Deferred Costs Gross	1,114,542	1,030,460
Less: Accumulated amortization	(381,260)	(411,662)
Deferred Costs, total	$ 733,282	$ 618,798

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Deferred Charges Schedule of Acquired In-Place Lease Intangibles (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 27,659
2024	21,595
2025	21,419
2026	20,571
2027	$ 18,214

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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($) ft² payments	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (450,918)	$ (391,441)
Investments in unconsolidated joint ventures		1,715,911	1,482,997
Investments In Affiliates Subsidiaries Associates And Joint Ventures net	[1]	1,630,485	1,445,926
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (85,400)	(37,100)
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Market Square North
Ownership Percentage		50.00%
Other Liabilities	[1]	$ (6,198)	(1,205)
BP/CRF Metropolitan Square LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Metropolitan Square
Ownership Percentage		20.00%
Other Liabilities	[1]	$ (37,629)	(15,356)
901 New York Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		901 New York Avenue
Ownership Percentage	[2]	25.00%
Other Liabilities	[1]	$ (12,493)	$ (12,597)
901 New York Avenue LLC (economic ownership) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%	50.00%
WP Project Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Wisconsin Place Land and Infrastructure
Ownership Percentage	[3]	33.33%
Investments in unconsolidated joint ventures	[1]	$ 31,971	$ 33,732
500 North Capitol Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		500 North Capitol Street, NW
Ownership Percentage		30.00%
Other Liabilities	[1]	$ (9,185)	(7,913)
501 K Street LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		1001 6th Street
Ownership Percentage	[4]	50.00%
Investments in unconsolidated joint ventures	[1]	$ 42,922	42,576
Potential additonal payments to joint venture partner | payments		2
Minimum square footage to make a potential additional payment to joint venture partner (in sqft) | ft²		520,000
Podium Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		The Hub on Causeway - Podium
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 46,839	48,980
Residential Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Hub50House
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 45,414	47,774
Hotel Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		The Hub on Causeway - Hotel Air Rights
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 12,366	11,505
Office Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 59,716	57,687
1265 Main Office JV LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		1265 Main Street
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 3,465	3,541
BNY Tower Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Dock 72
Ownership Percentage	[5]	50.00%
Investments in unconsolidated joint ventures	[1]	$ (19,921)	28,412
CA-Colorado Center LLC[Member]
Schedule of Equity Method Investments [Line Items]
Properties		Colorado Center
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 233,862	231,479
7750 Wisconsin Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		7750 Wisconsin Avenue
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 52,152	61,626
BP-M 3HB Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		3 Hudson Boulevard
Ownership Percentage		25.00%
Investments in unconsolidated joint ventures	[1]	$ 116,397	116,306
SMBP Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Santa Monica Business Park
Ownership Percentage		55.00%
Investments in unconsolidated joint ventures	[1]	$ 164,735	156,639
Platform 16 Holdings LP [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Platform 16
Ownership Percentage	[6]	55.00%
Investments in unconsolidated joint ventures	[1]	$ 158,109	109,086
Gateway Portfolio Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Gateway Commons
Ownership Percentage	[7]	50.00%
Investments in unconsolidated joint ventures	[1]	$ 324,038	327,148
Rosecrans-Sepulveda Partners 4, LLC
Schedule of Equity Method Investments [Line Items]
Properties		Beach Cities Media Campus
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 27,000	27,106
Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.33%
Safeco Plaza REIT LLC
Schedule of Equity Method Investments [Line Items]
Properties		Safeco Plaza
Ownership Percentage	[8]	33.67%
Investments in unconsolidated joint ventures	[1]	$ 69,785	72,545
Safeco Plaza REIT LLC | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.00%
360 PAS Holdco LLC
Schedule of Equity Method Investments [Line Items]
Properties		360 Park Avenue South
Ownership Percentage	[9]	42.21%
Investments in unconsolidated joint ventures	[1]	$ 114,992	$ 106,855
360 PAS Holdco LLC | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		35.79%
360 PAS Holdco LLC | Joint Venture Partner [Member] | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		58.00%
Safeco Partner Entity One [Member] | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
Safeco Partner Entity Two | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
360 PAS Holdco LLC (indirect ownership) | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		5.837%
360 Park Avenue South Partners Entity | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
360 Park Avenue South Partners Entity Two | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
PR II BXP Reston Gateway LLC
Schedule of Equity Method Investments [Line Items]
Properties		Reston Next Residential
Ownership Percentage	[10]	20.00%
Investments in unconsolidated joint ventures	[1]	$ 11,351
PR II BXP Reston Gateway LLC | Joint Venture Partner [Member] | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		80.00%
751 Gateway Holdings LLC
Schedule of Equity Method Investments [Line Items]
Properties		751 Gateway
Ownership Percentage	[7]	49.00%
Investments in unconsolidated joint ventures	[1]	$ 80,714
200 Fifth Avenue JV LLC
Schedule of Equity Method Investments [Line Items]
Properties		200 Fifth Avenue
Ownership Percentage		26.69%
Investments in unconsolidated joint ventures	[1]	$ 120,083
Office Tower Developer LLC
Schedule of Equity Method Investments [Line Items]
Properties		100 Causeway Street

[1] Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

[2] The Company’s economic ownership has increased based on the achievement of certain return thresholds. At December 31, 2022 and December 31, 2021, the Company’s economic ownership was approximately 50%.

[3] The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.

[4] Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project in excess of 520,000 square feet and achieving certain project returns at stabilization.

[5] This property includes net equity balances from the amenity joint venture.

[6] This entity is a VIE (See Note 2).

[7] On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

[8] The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.

[9] The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

[10] The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
ASSETS
Total real estate		$ 19,496,442	$ 18,275,954
Total assets		24,207,669	22,365,258
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		3,272,368	3,267,914
Other Liabilities		450,918	391,441
Members’/Partners’ equity		6,132,919	5,834,020
Total liabilities and equity / capital		24,207,669	22,365,258
Carying value of the Company's investment in unconsolidated joint ventures		1,715,911	1,482,997
Right-of-use assets - finance leases		237,510	237,507
Right of use assets - operating leases		167,351	169,778
Lease liabilities - finance leases		249,335	244,421
Lease liabilities - operating leases		204,686	204,561
Unconsolidated Joint Ventures [Member]
ASSETS
Total real estate	[1]	6,537,554	5,579,218
Other assets		756,786	586,470
Total assets		7,294,340	6,165,688
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		4,022,746	3,214,961
Other Liabilities	[2]	716,271	652,135
Members’/Partners’ equity		2,555,323	2,298,592
Total liabilities and equity / capital		7,294,340	6,165,688
Company's share of equity		1,238,929	1,104,175
Basis differentials	[3]	391,556	341,751
Carying value of the Company's investment in unconsolidated joint ventures	[4]	1,630,485	1,445,926
Right-of-use assets - finance leases		248,900	248,900
Right of use assets - operating leases		21,200	22,300
Lease liabilities - finance leases		382,200	385,500
Lease liabilities - operating leases		30,500	30,400
Unconsolidated Joint Ventures [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Other Liabilities		85,400	37,100
Colorado Center
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		301,820	304,776
Carying value of the Company's investment in unconsolidated joint ventures	[5]	233,862	231,479
Gateway Commons Complex [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		47,808	51,009
Carying value of the Company's investment in unconsolidated joint ventures	[5]	324,038	327,148
Dock 72
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		(98,980)	(50,051)
Carying value of the Company's investment in unconsolidated joint ventures	[5]	(19,921)	$ 28,412
200 Fifth Avenue JV LLC
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		94,497
Carying value of the Company's investment in unconsolidated joint ventures	[5]	$ 120,083

[1] At December 31, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At December 31, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.2 million and $22.3 million, respectively.

[2] At December 31, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $382.2 million and $385.5 million, respectively. At December 31, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 million, respectively.

[3] This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The majority of the Company’s basis differences are as follows: December 31, 2022December 31, 2021Property(in thousands)Colorado Center$301,820 $304,776 200 Fifth Avenue94,497 N/AGateway Commons47,808 51,009 Dock 72(98,980)(50,051) These basis differentials (excluding land) will be amortized over the remaining lives of the related assets and liabilities.

[4] Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

[5] Investments with deficit balances aggregating approximately $85.4 million and $37.1 million at December 31, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)		Mar. 30, 2021
Schedule of Equity Method Investments [Line Items]
Total revenue		$ 3,108,581		$ 2,888,621		$ 2,765,686
Expenses
Transaction costs		2,905		5,036		1,531
Depreciation and amortization		749,775		717,336		683,751
Total expenses		2,050,056		1,920,581		1,860,364
Other income (expense)
Losses from early extinguishment of debt		0		(45,182)		0
Interest expense		(437,139)		(423,346)		(431,717)
Gains on sales of real estate		437,019		123,660		618,982
Net income		1,020,584		631,932		1,018,691
Income (Loss) from Equity Method Investments		(59,840)		(2,570)		(85,110)
Straight Line Rent Adjustments		108,000		104,300		104,900
Write-off (reinstatement) for accrued rent and accounts receivables		(1,500)		1,300		90,300
Above and below market rent adjustments, net		9,100		4,200		6,500
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	[1]	512,078		383,649		319,560
Expenses
Operating		198,632		158,498		144,347
Transaction costs		837		470		1,027
Depreciation and amortization		181,041		147,121		141,853
Total expenses		380,510		306,089		287,227
Other income (expense)
Losses from early extinguishment of debt		(1,327)		0		0
Interest expense		(154,065)		(108,884)		(98,051)
Unrealized gain on derivative instruments		1,681		0		0
Gains on sales of real estate		0		0		11,737	[2]
Net income		(22,143)		(31,324)		(53,981)
Company's share of net income		(2,551)		(10,254)		(16,256)
Gain on Sale of Investments		0		10,257	[3]	0
Impairment loss on investment		(50,705)	[4]	0		(60,524)	[4]
Basis differential	[5]	(6,584)		(2,573)		(8,330)
Income (Loss) from Equity Method Investments		(59,840)		(2,570)		(85,110)
Straight Line Rent Adjustments		(62,900)		(17,200)		(10,100)
Above and below market rent adjustments, net		400		400		$ 900
Parcels of undeveloped land						2
Annapolis Junction NFM, LLC [Member]
Other income (expense)
Gain on Sale of Investments				10,300
Ownership Percentage								50.00%
Colorado Center [Member] | Unconsolidated Joint Ventures [Member]
Other income (expense)
Straight Line Rent Adjustments		500		$ 800		$ 1,800
Dock 72 [Member] | Unconsolidated Joint Ventures [Member]
Other income (expense)
Impairment loss on investment		$ 50,700				$ 60,500

[1] Includes straight-line rent adjustments of approximately $62.9 million, $17.2 million and $(10.1) million for the years ended December 31, 2022, 2021 and 2020, respectively.

[2] For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

[3] During the year ended December 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.

[4] During the years ended December 31, 2022 and December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million and $60.5 million, respectively.

[5] Includes straight-line rent adjustments of approximately $0.5 million, $0.8 million and $1.8 million for the years ended December 31, 2022, 2021 and 2020, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million, $0.4 million and $0.9 million for the years ended December 31, 2022, 2021 and 2020, respectively.

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Investment in Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands																			1 Months Ended	4 Months Ended			12 Months Ended
		Dec. 31, 2022 USD ($)	Dec. 23, 2022 ft² loanExtension	Dec. 22, 2022 USD ($) loanExtension	Dec. 07, 2022 ft²	Dec. 06, 2022 USD ($) loanExtension	Nov. 17, 2022 USD ($) ft² floor	Sep. 09, 2022 USD ($) ft²	Sep. 08, 2022 USD ($)	Sep. 01, 2022 USD ($) ft²	Aug. 08, 2022 USD ($) ft²	Aug. 07, 2022 USD ($)	Jun. 17, 2022 USD ($)	Jun. 16, 2022 USD ($) ft²	May 13, 2022 USD ($) loanExtension years	Apr. 18, 2022 USD ($) ft²	Mar. 28, 2022 USD ($) years loanExtension	Mar. 27, 2022 USD ($) years loanExtension	Dec. 31, 2022 USD ($)	Sep. 06, 2023	Sep. 05, 2023	Apr. 30, 2023	Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)		Feb. 02, 2022 ft²	Jan. 18, 2022 ft²
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)		$ 3,272,368																	$ 3,272,368				$ 3,272,368		$ 3,267,914
Debt Instrument, Basis Spread on Variable Rate		0.775%
Payment for Debt Extinguishment or Debt Prepayment Cost																							0		43,036	$ 0
Losses from early extinguishment of debt																							0		(45,182)	0
Payments to Acquire Equity Method Investments																							277,581		98,152	172,436
Assumption of mortgage notes payable																							$ 0		200,311	0
Gateway Commons Complex [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[1]	50.00%																	50.00%				50.00%
Gateway Commons Complex [Member] | 651 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																													50.00%
Platform 16
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[2]	55.00%																	55.00%				55.00%
Platform 16 | Platform 16 | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																												55.00%
Net Rentable Area (in sf) | ft²																												1,100,000
BP/CRF Metropolitan Square LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		20.00%																	20.00%				20.00%
BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																	20.00%
Net Rentable Area (in sf) | ft²										657,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)																	$ 420,000	$ 294,100
Debt Instrument, Description of Variable Rate Basis																		the greater of (x) LIBOR or (y) 0.65%
Debt Instrument, Basis Spread on Variable Rate																	2.75%	4.75%
Number of extensions | loanExtension																	3	2
Extension Option (in years) | years																	1	1
Payment for Debt Extinguishment or Debt Prepayment Cost																	$ 0
Losses from early extinguishment of debt																	(1,300)
Proceeds from mortgage notes payable																	100,500
BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square | Unconsolidated Properties | Interest Rate Cap
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis										SOFR
Derivative, Notional Amount										$ 420,000
Derivative, Cap Interest Rate										4.50%
Residential Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%																	50.00%				50.00%
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																50.00%
Proceeds from mortgage notes payable													$ 6,800
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties | Interest Rate Swap
Schedule of Equity Method Investments [Line Items]
Derivative, Notional Amount													$ 185,000
Derivative, Forward Interest Rate													4.432%
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties | Adjustable Rate Loans
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)													$ 185,000	$ 176,700		$ 176,500
Debt Instrument, Basis Spread on Variable Rate													1.35%			2.00%
PR II BXP Reston Gateway LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[3]	20.00%																	20.00%				20.00%
751 Gateway Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[1]	49.00%																	49.00%				49.00%
BNY Tower Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[4]	50.00%																	50.00%				50.00%
BNY Tower Holdings LLC [Member] | Dock 72 [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage											50.00%
Net Rentable Area (in sf) | ft²											669,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)				$ 198,400							$ 198,400	$ 198,400
Debt Instrument, Description of Variable Rate Basis				the greater of (x) SOFR or (y) 0.25%							the greater of (x) SOFR or (y) 0.25%	LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.50%							3.10%	3.35%
Debt Instrument, Interest Rate, Stated Percentage				0.25%							0.25%
Debt instrument, borrowing capacity												$ 250,000
Impairment loss on investment																			$ 50,700
Capitalization Rate																			5.75%
Investment in Unconsolidated Joint Venture, Measurement Input																			7.00%
Equity Method Investment, impairment information																			The Company determined that its valuation of the investment was categorized within Level 3 of the fair value hierarchy, as it utilized significant unobservable inputs in its assessment including an exit capitalization rate of 5.75%, a discount rate on the Company’s equity investment (the property is encumbered by mortgage debt) of 7.0% and leasing the currently available space over the period of 2023-2026.
Safeco Plaza REIT LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[5]	33.67%																	33.67%				33.67%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage								33.67%
Net Rentable Area (in sf) | ft²								765,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)									$ 250,000
Debt Instrument, Description of Variable Rate Basis								the greater of (x) 2.35% or (y) SOFR	the greater of (x) 2.35% or (y) LIBOR
Debt Instrument, Basis Spread on Variable Rate								2.32%	2.20%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								2.35%	2.35%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties | Interest Rate Cap
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis								SOFR
Derivative, Notional Amount								$ 250,000
Derivative, Cap Interest Rate								2.50%
200 Fifth Avenue JV LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		26.69%																	26.69%				26.69%
200 Fifth Avenue JV LLC | 200 Fifth Avenue | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage							26.69%
Net Rentable Area (in sf) | ft²							855,000
Debt Instrument, Basis Spread on Variable Rate							1.30%
Noncash or Part Noncash Acquisition, Value of Assets Acquired							$ 280,200
Payments to Acquire Equity Method Investments							120,100
Assumption of mortgage notes payable							$ 160,100
Number of floors | floor							14
200 Fifth Avenue JV LLC | 200 Fifth Avenue | Unconsolidated Properties | Interest Rate Swap
Schedule of Equity Method Investments [Line Items]
Derivative, Notional Amount							$ 600,000
Derivative, Forward Interest Rate							4.34%
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%																	50.00%				50.00%
Square 407 Limited Partnership [Member] | Market Square North | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					50.00%
Net Rentable Area (in sf) | ft²					418,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)						$ 125,000
Debt Instrument, Description of Variable Rate Basis					the greater of (1) the sum of (x) the “benchmark rate”, (y) 2.30% and (z) the adjustment applicable to such “benchmark rate” (approximately 0.11% for Term SOFR), or (2) 2.80%	the greater of (x) LIBOR or (y) 0.50%,
Debt Instrument, Basis Spread on Variable Rate						2.30%
Number of extensions | loanExtension						1
Extension Option (in years)					1	1
Square 407 Limited Partnership [Member] | Market Square North | Unconsolidated Properties | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					2.80%
Podium Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%																	50.00%				50.00%
Joint Venture Partner [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture															$ 500
Joint Venture Partner [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage															80.00%
Payments to Acquire Interest in Joint Venture															$ 58,700
Joint Venture Partner [Member] | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage														51.00%
Contribution of Property														$ 53,900
Payments to Acquire Interest in Joint Venture														$ 4,900
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)		$ 4,022,746																	$ 4,022,746				$ 4,022,746		3,214,961
Losses from early extinguishment of debt																							(1,327)		0	0
Impairment loss on investment																							$ (50,705)	[6]	$ 0	$ (60,524)	[6]
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Contribution of Property															11,300
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture															$ 3,500
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Adjustable Rate Loans
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis															SOFR
Debt Instrument, Basis Spread on Variable Rate															2.00%
Number of extensions | loanExtension															2
Extension Option (in years) | years															1
Debt Instrument, Unused Borrowing Capacity, Amount															$ 140,000
Unconsolidated Joint Ventures [Member] | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage														49.00%
Contribution of Property														$ 53,900
Payments to Acquire Interest in Joint Venture														$ 2,600
Unconsolidated Joint Ventures [Member] | Podium Developer LLC [Member] | The Hub on Causeway - Podium | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage			50.00%
Net Rentable Area (in sf) | ft²			380,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)				$ 174,300
Unconsolidated Joint Ventures [Member] | Podium Developer LLC [Member] | The Hub on Causeway - Podium | Unconsolidated Properties | London Interbank Offered Rate (LIBOR)
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.25%																		2.25%
Unconsolidated Joint Ventures [Member] | Podium Developer LLC [Member] | The Hub on Causeway - Podium | Unconsolidated Properties | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate																				2.35%
Unconsolidated Joint Ventures [Member] | Office Tower Developer LLC | 100 Causeway Street [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage			50.00%
Net Rentable Area (in sf) | ft²			630,000
Mortgage notes payable, net (amounts related to VIEs of $3,272,368 and $3,267,914 at December 31, 2022 and December 31, 2021, respectively)				$ 337,600
Number of extensions | loanExtension			2	2
Extension Option (in years)			1	1
Unconsolidated Joint Ventures [Member] | Office Tower Developer LLC | 100 Causeway Street [Member] | Unconsolidated Properties | London Interbank Offered Rate (LIBOR)
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.50%																		1.50%
Unconsolidated Joint Ventures [Member] | Office Tower Developer LLC | 100 Causeway Street [Member] | Unconsolidated Properties | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate																					1.60%
Company's Share [Member] | BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square
Schedule of Equity Method Investments [Line Items]
Proceeds from mortgage notes payable																	$ 20,100
Company's Share [Member] | Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Proceeds from mortgage notes payable													$ 3,400
Company's Share [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage															96.00%
Company's Share [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage															20.00%
Construction | Gateway Commons Complex [Member] | 651 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²																													327,000
Construction | Platform 16 | Platform 16 | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²																												390,000
Construction | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²														231,000
Construction | Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Number of Units in Real Estate Property															508
Residential Building | Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²																320,000
Number of Units in Real Estate Property																440

[1] On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

[2] This entity is a VIE (See Note 2).

[3] The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

[4] This property includes net equity balances from the amenity joint venture.

[5] The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.

[6] During the years ended December 31, 2022 and December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million and $60.5 million, respectively.

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Mortgage Notes Payable, Net (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Rate	Dec. 31, 2021 USD ($) Rate
Debt Instrument [Line Items]
Mortgage notes payable, net | $	$ 3,272,368	$ 3,267,914
Debt Instrument, Collateral	each collateralized by one or more buildings and related land included in real estate assets	each collateralized by one or more buildings and related land included in real estate assets
Number Of Variable Mortgage Loans	0	0
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net | $	$ 3,272,368	$ 3,300,000
Fixed Rate Mortgage [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net | $	$ 3,300,000	$ 3,300,000
Debt, Weighted Average Interest Rate | Rate	3.24%	3.24%
Fixed Rate Mortgage [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage | Rate	2.79%	2.79%
Fixed Rate Mortgage [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage | Rate	3.43%	3.43%

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Schedule of Aggregate Principal Payments on Mortgage Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Mortgage notes payable, net	$ 3,272,368	$ 3,267,914
Mortgages [Member]
Debt Instrument [Line Items]
2023	0
2024	0
2025	0
2026	0
2027	2,300,000
Thereafter	1,000,000
Total	3,300,000
Deferred financing costs, net	27,632
Mortgage notes payable, net	$ 3,272,368	$ 3,300,000

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Schedule of Unsecured Senior Notes (Details) - USD ($) $ in Thousands		Dec. 31, 2022		Nov. 17, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Senior Notes		$ 10,237,968			$ 9,483,695
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt Issuance Costs, Net		27,632
Senior Notes		10,237,968			$ 9,483,695
Boston Properties Limited Partnership | Senior Notes
Debt Instrument [Line Items]
Debt		10,300,000
Debt Instrument, Unamortized Discount		14,094
Debt Issuance Costs, Net		47,938
Senior Notes		$ 10,237,968
Boston Properties Limited Partnership | Senior Notes | 3.279% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.125%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.279%
Debt		$ 500,000
Long-term Debt, Maturity Date	[2]	Sep. 01, 2023
Boston Properties Limited Partnership | Senior Notes | 3.916% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.80%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.916%
Debt		$ 700,000
Long-term Debt, Maturity Date	[2]	Feb. 01, 2024
Boston Properties Limited Partnership | Senior Notes | 3.350% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.20%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.35%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Jan. 15, 2025
Boston Properties Limited Partnership | Senior Notes | 3.766% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.65%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.766%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Feb. 01, 2026
Boston Properties Limited Partnership | Senior Notes | 3.495% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.75%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.495%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Oct. 01, 2026
Boston Properties Limited Partnership | Senior Notes | 6.924% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%		6.75%
Debt Instrument, Interest Rate, Effective Percentage		6.924%	[1]	6.924%
Debt		$ 750,000		$ 750,000
Long-term Debt, Maturity Date	[2]	Dec. 01, 2027
Boston Properties Limited Partnership | Senior Notes | 4.628% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.50%
Debt Instrument, Interest Rate, Effective Percentage	[1]	4.628%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Dec. 01, 2028
Boston Properties Limited Partnership | Senior Notes | 3.505% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.40%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.505%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Jun. 21, 2029
Boston Properties Limited Partnership | Senior Notes | 2.984% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.90%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.984%
Debt		$ 700,000
Long-term Debt, Maturity Date	[2]	Mar. 15, 2030
Boston Properties Limited Partnership | Senior Notes | 3.343 % unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.25%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.343%
Debt		$ 1,250,000
Long-term Debt, Maturity Date	[2]	Jan. 30, 2031
Boston Properties Limited Partnership | Senior Notes | 2.671% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.55%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.671%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Apr. 01, 2032
Boston Properties Limited Partnership | Senior Notes | 2.524% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.45%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.524%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Oct. 01, 2033

[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

[2] No principal amounts are due prior to maturity.

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Unsecured Senior Notes (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 17, 2022	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Proceeds from unsecured senior notes		$ 749,557		$ 1,695,996	$ 1,248,125
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Proceeds from unsecured senior notes		749,557		$ 1,695,996	$ 1,248,125
Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt		$ 10,300,000
Debt Instrument, Covenant Description		The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt.
Leverage ratio		60.00%
Secured debt leverage ratio - maximum		50.00%
Interest Coverage - Maximum		1.50
Unencumbered Asset Value - Minimum		150.00%
Debt Instrument, Covenant Compliance		At December 31, 2022, BPLP was in compliance with each of these financial restrictions and requirements.
6.924% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt	$ 750,000	$ 750,000
Debt Instrument, Interest Rate, Stated Percentage	6.75%	6.75%
Senior Notes Pricing	99.941%
Debt Instrument, Interest Rate, Effective Percentage	6.924%	6.924%	[1]
Proceeds from unsecured senior notes	$ 743,500

[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

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Unsecured Credit Facility (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 15, 2021	Dec. 31, 2021
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date		Jun. 15, 2026
Line of Credit, Additional Borrowing Capacity		$ 500,000
Line of Credit Facility, Interest Rate Description		At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating. The 2021 Credit Facility includes provisions which allow LIBOR Daily Floating Rate to be switched to SOFR.
Line of credit facility, maximum percent for loan advances		65.00%
Line of Credit Facility, Commitment Fee Percentage	0.15%
Debt Instrument, Basis Spread on Variable Rate	0.775%
Debt Instrument, Alternate Basis Spread on Variable Rate	0.00%
Long-term Line of Credit	$ 0		$ 145,000
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		1.40%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.70%
2017 Credit Facility, Delayed Draw Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500,000
Long-term Line of Credit	$ 0		$ 145,000

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Unsecured Term Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2022	May 17, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Unsecured term loan	$ 730,000	$ 730,000	$ 0
Debt Instrument, Basis Spread on Variable Rate	0.775%
2022 Unsecured Term Loan
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 730,000
Debt Instrument, Maturity Date		May 16, 2023
Debt Instrument, Interest Rate Terms		At BPLP’s option, the 2022 Unsecured Term Loan bore interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate was unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.
Unsecured term loan	$ 730,000	$ 730,000
2022 Unsecured Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.95%

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2021 Credit Facility and 2022 Unsecured Term Loan Compliance (Details) - 2021 Credit Facility and 2022 Unsecured Term Loan	12 Months Ended
	Dec. 31, 2022
Debt Instrument [Line Items]
Debt Instrument, Covenant Description	The 2021 Credit Facility and 2022 Unsecured Term Loan contain customary representations and warranties, affirmative and negative covenants and events of default provisions, including the failure to pay indebtedness, breaches of covenants and bankruptcy and other insolvency events, which could result in the acceleration of the obligation to repay, in the case of the 2021 Credit Facility, all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Facility and, in the case of the 2022 Unsecured Term Loan, any outstanding amount under the 2022 Unsecured Term Loan. Among other covenants, the 2021 Credit Facility and the 2022 Unsecured Term Loan require that BPLP maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments.
Leverage ratio	60.00%
Leverage ratio - maximum	65.00%
Secured debt leverage ratio - maximum	55.00%
Fixed charge coverage - minimum	1.40
Unsecured debt leverage ratio	60.00%
Unsecured debt leverage ratio - maximum	65.00%
Unsecured debt interest coverage ratio	1.75
Debt Instrument, Covenant Compliance	At December 31, 2022, BPLP was in compliance with each of these financial and other covenant requirements.

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Commitments And Contingencies (Details) $ in Thousands		12 Months Ended
	Jun. 27, 2022 USD ($)	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 29, 2022 ft²	Jun. 26, 2022 USD ($)	May 09, 2019 ft²
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations		$ 26,500
Notes receivable, net		0	$ 9,641
Proceeds from note receivable		10,000	10,035	$ 6,397
Property insurance program per occurrence limits		1,000,000
Per occurrence limit for NBCR Coverage		1,000,000
Value of program trigger		$ 200,000
Coinsurance of program trigger		20.00%
Program trigger deductible		20.00%
Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions		$ 330,000
Annual aggregate limit of the earthquake insurance which covers San Francisco and Los Angeles regions		330,000
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles		$ 30,000
Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles		3.00%
Per Occurrence Limit of Earthquake Insurance Seattle		$ 110,000
Annual Aggregate Limit of Earthquake Insurance Seattle		$ 110,000
Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle		2.00%
Affiliate of Bernstein Companies [Member]
Commitments And Contingencies [Line Items]
Notes receivable, net						$ 10,000
Proceeds from note receivable	$ 10,000
Note receivable fixed interest rate						8.00%
Proceeds from Interest Received	$ 1,600
Boston Properties Limited Partnership
Commitments And Contingencies [Line Items]
Notes receivable, net		$ 0	9,641
Proceeds from note receivable		10,000	$ 10,035	$ 6,397
Operating partnership guarantee to cover liabilities of IXP		20,000
767 Venture, LLC [Member]
Commitments And Contingencies [Line Items]
Maximum funding obligation		13,700
Property insurance program per occurrence limits		1,625,000
325 Main Street
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²					414,000		115,000
601 Lexington Avenue
Commitments And Contingencies [Line Items]
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP		1,350,000
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism		750,000
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism		600,000
Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism		$ 1,750,000
Future Residential Building [Member] | 325 Main Street
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²		200,000
Affordable Housing requirement		25.00%
Home Ownership Units [Member] | Future Residential Building [Member] | 325 Main Street
Commitments And Contingencies [Line Items]
Affordable Housing requirement		20.00%

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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership	Dec. 31, 2022 shares
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	16,531,172
LTIP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	1,679,175
2012 OPP and 2013-2019 MYLTIP
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	464,036
MYLTIP 2020 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	203,278
MYLTIP 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	350,989
MYLTIP 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	253,453

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(Common Units) (Narrative) (Details) $ / shares in Units, $ in Thousands						12 Months Ended
	Feb. 04, 2022 USD ($) shares	Feb. 01, 2022 USD ($)	Dec. 14, 2021 USD ($) shares	Feb. 05, 2021 USD ($) shares	Feb. 06, 2020 USD ($) shares	Dec. 31, 2022 USD ($) yr shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 30, 2022 $ / shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Vesting Period						4 years
Issuance of operating partnership units for 360 Park Avenue South | $						$ 0	$ 99,689	$ 0
360 Park South Avenue
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Issuance of operating partnership units for 360 Park Avenue South | $			$ 99,700
Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Issuance of operating partnership units for 360 Park Avenue South | $						0	99,689	$ 0
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $						$ 1,280,886	$ 2,078,603
Boston Properties Limited Partnership | 360 Park South Avenue
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued | shares			866,503
MYLTIP | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Vesting Period						3 years
Unvested MYLTIP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
unvested MYLTIP distributions as compared to total distributions (percentage)						10.00%
MYLTIP 2017 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Final awards percentage of target					83.80%
Value of MYLTIP Awards | $					$ 17,600
Forfeitures, in units | shares					270,942
MYLTIP 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Final awards percentage of target				29.20%
Value of MYLTIP Awards | $				$ 4,600
Forfeitures, in units | shares				285,925
MYLTIP 2019 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Final awards percentage of target	69.00%
Value of MYLTIP Awards | $	$ 8,600
Forfeitures, in units | shares	144,043
MYLTIP 2020 [Member] | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding | shares						203,278
MYLTIP 2021 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding | shares						350,989
MYLTIP 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Vesting Period		3 years
Value of MYLTIP Awards | $		$ 17,300
MYLTIP 2022 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding | shares						253,453
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares) | shares						182,929	523,969
Restriction on redemption of OP Unit to Common Stock (in years) | yr						1
Redemption of OP Unit equivalent to Common Stock (in shares) | shares						1
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $						$ 1,300,000
Closing price of common stock (in dollars per share) | $ / shares									$ 67.58
Noncontrolling Interest [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Issuance of operating partnership units for 360 Park Avenue South | $							$ 99,689
Vested 2012 OPP units and MYLTIPS
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares) | shares						78,249	148,442

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Noncontrolling Interests Common Units Distributions (Details) - $ / shares	Oct. 31, 2022	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Jan. 28, 2021	Oct. 30, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 30, 2020	Dec. 19, 2022
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit													$ 0.98
Dividends, Per Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98
Boston Properties Limited Partnership
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit													0.98
Dividends, Per Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98
Boston Properties Limited Partnership | Op units and LTIP units
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit													0.98
Dividends, Per Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98
Boston Properties Limited Partnership | Unvested MYLTIP Units [Member]
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit													$ 0.098
Dividends, Per Unit, Cash Paid	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098

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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Noncontrolling Interest [Line Items]
Noncontrolling Interest in Limited Partnerships	$ 1,547,317	$ 1,556,553

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Stockholders' Equity / Partners' Capital Narrative (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Apr. 01, 2021	Mar. 31, 2021 USD ($)	Mar. 02, 2021 USD ($) $ / shares shares	May 22, 2020 USD ($) yr	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Mar. 27, 2018 $ / shares	Jun. 02, 2017 USD ($)
Class of Stock [Line Items]
Common Stock, Shares, Outstanding					156,757,867	156,544,849
General Partners' Capital Account, Units Outstanding (in units)					1,749,682
Limited Partners' Capital Account, Units Outstanding (in units)					155,008,185
Options exercised					0	247,920
Shares of Common Stock issued in connection with redemption of an equal number of OP Units (in shares)					182,929	523,969
Series B, Shares Outstanding (in shares)					0	0
Preferred Stock Redemption Premium | $					$ 0	$ 6,412	$ 0
ATM Program [Member]
Class of Stock [Line Items]
At The Market Stock Offering Program Aggregate Value Of Common Stock | $				$ 600,000					$ 600,000
At Market Stock Offering Program Maximum Length Of Sale (in years) | yr				3
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Class of Stock [Line Items]
Series B, Shares Outstanding (in shares)			80,000				80,000
Series B Liquidation Preference Per Share/ Unit | $ / shares							$ 2,500	$ 2,500
Series B, Dividend Rate, Percentage			5.25%				5.25%
Preferred Stock, Redemption Price Per Share | $ / shares			$ 2,500
Preferred Stock Redemption Price Per Share, plus accrued and unpaid dividends | $ / shares			$ 2,516.41
Preferred Stock, Redemption Amount | $			$ 201,300
Redeemable Preferred Stock Dividends | $			$ 1,300
Preferred Stock Redemption Premium | $		$ 6,400
Preferred Stock, Redemption Date	Apr. 01, 2021
Depository shares of Series B Cumulative Redeemable Preferred
Class of Stock [Line Items]
Series B, Shares Outstanding (in shares)							8,000,000
Series B Liquidation Preference Per Share/ Unit | $ / shares							$ 25.00	$ 25.00

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Stockholders' Equity / Partners' Capital Dividends / Distributions (Details) - $ / shares	Oct. 31, 2022	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Feb. 16, 2021	Jan. 28, 2021	Nov. 16, 2020	Oct. 30, 2020	Aug. 17, 2020	Jul. 31, 2020	May 15, 2020	Apr. 30, 2020	Feb. 18, 2020	Jan. 30, 2020	Dec. 19, 2022
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																		$ 0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98
Boston Properties Limited Partnership
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																		0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98		0.98		0.98		0.98		0.98		0.98
Boston Properties Limited Partnership | Op units and LTIP units
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																		0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98		0.98		0.98		0.98		0.98		0.98
Boston Properties Limited Partnership | Unvested MYLTIP Units [Member]
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																		$ 0.098
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098		$ 0.098		$ 0.098		$ 0.098		$ 0.098		$ 0.098
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Dividends / Distributions [Line Items]
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid								$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125

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Segment Information Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Parking and Other [Member]
Segment Reporting Information [Line Items]
Increase (decrease) in parking and other revenue	$ 25.4

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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($)		3 Months Ended		12 Months Ended
	Dec. 19, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders		$ 111,882,000	$ 184,537,000	$ 848,947,000	$ 496,223,000	$ 862,227,000
Preferred Stock Redemption Charge				0	(6,412,000)	0
Preferred dividends / distributions				0	(2,560,000)	(10,500,000)
Noncontrolling interest-common units of the Operating Partnership				(96,780,000)	(55,931,000)	(97,704,000)
Noncontrolling interest in property partnerships				(74,857,000)	(70,806,000)	(48,260,000)
Interest expense				(437,139,000)	(423,346,000)	(431,717,000)
Losses from early extinguishment of debt				0	45,182,000	0
Unrealized Gain (Loss) on Investments				150,000	0	0
Company's share of net operating income from joint ventures				(1,929,527,000)	(1,814,288,000)	(1,694,075,000)
Loss from unconsolidated joint ventures				59,840,000	2,570,000	85,110,000
Depreciation and amortization expense				(749,775,000)	(717,336,000)	(683,751,000)
Transaction costs				(2,905,000)	(5,036,000)	(1,531,000)
General and administrative expense				(146,378,000)	(151,573,000)	(133,112,000)
Gains (losses) from investments in securities				6,453,000	(5,626,000)	(5,261,000)
Other Income - assignment fee				(6,624,000)	0	0
Interest and other income (loss)				(11,940,000)	(5,704,000)	(5,953,000)
Sales-type and Direct Financing Leases, Profit (Loss)	$ (10,100,000)			(10,058,000)	0	0
Gains on sales of real estate				(437,019,000)	(123,660,000)	(618,982,000)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders				848,947,000	496,223,000	862,227,000
Preferred Stock Redemption Charge				0	6,412,000	0
Preferred dividends / distributions				0	2,560,000	10,500,000
Noncontrolling interest-common units of the Operating Partnership				96,780,000	55,931,000	97,704,000
Noncontrolling interest in property partnerships				74,857,000	70,806,000	48,260,000
Interest expense				437,139,000	423,346,000	431,717,000
Losses from early extinguishment of debt				0	45,182,000	0
Unrealized Gain (Loss) on Investments				150,000	0	0
Loss from unconsolidated joint ventures				59,840,000	2,570,000	85,110,000
Depreciation and amortization expense				749,775,000	717,336,000	683,751,000
Transaction costs				2,905,000	5,036,000	1,531,000
Operating expense				15,450,000	12,487,000	11,626,000
General and administrative expense				146,378,000	151,573,000	133,112,000
Gains (losses) from investments in securities				(6,453,000)	5,626,000	5,261,000
Other Income - assignment fee				6,624,000	0	0
Interest and other income (loss)				11,940,000	5,704,000	5,953,000
Sales-type and Direct Financing Leases, Profit (Loss)				(10,058,000)	0	0
Gains on sales of real estate				437,019,000	123,660,000	618,982,000
Other revenue				15,450,000	12,487,000	11,626,000
Company's share of Net Operating Income				1,883,796,000	1,735,740,000	1,626,131,000
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense				(154,065,000)	(108,884,000)	(98,051,000)
Losses from early extinguishment of debt				1,327,000	0	0
Company's share of net operating income from joint ventures				(146,081,000)	(107,756,000)	(94,943,000)
Loss from unconsolidated joint ventures				59,840,000	2,570,000	85,110,000
Depreciation and amortization expense				(181,041,000)	(147,121,000)	(141,853,000)
Transaction costs				(837,000)	(470,000)	(1,027,000)
Gains on sales of real estate				0	0	(11,737,000)	[1]
Unconsolidated Joint Ventures [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures						94,943,000
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders				957,265,000	561,993,000	979,979,000
Preferred Stock Redemption Charge				0	(6,412,000)	0
Preferred dividends / distributions				0	(2,560,000)	(10,500,000)
Noncontrolling interest in property partnerships				(74,857,000)	(70,806,000)	(48,260,000)
Interest expense				(437,139,000)	(423,346,000)	(431,717,000)
Losses from early extinguishment of debt				0	45,182,000	0
Unrealized Gain (Loss) on Investments				150,000	0	0
Loss from unconsolidated joint ventures				59,840,000	2,570,000	85,110,000
Depreciation and amortization expense				(742,293,000)	(709,035,000)
Transaction costs				(2,905,000)	(5,036,000)	(1,531,000)
General and administrative expense				(146,378,000)	(151,573,000)	(133,112,000)
Gains (losses) from investments in securities				6,453,000	(5,626,000)	(5,261,000)
Other Income - assignment fee				(6,624,000)	0	0
Interest and other income (loss)				(11,940,000)	(5,704,000)	(5,953,000)
Sales-type and Direct Financing Leases, Profit (Loss)				(10,058,000)	0	0
Gains on sales of real estate				(441,075,000)	(125,198,000)	(631,945,000)
Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders				957,265,000	561,993,000	979,979,000
Preferred Stock Redemption Charge				0	6,412,000	0
Preferred dividends / distributions				0	2,560,000	10,500,000
Noncontrolling interest in property partnerships				74,857,000	70,806,000	48,260,000
Interest expense				437,139,000	423,346,000	431,717,000
Losses from early extinguishment of debt				0	45,182,000	0
Unrealized Gain (Loss) on Investments				150,000	0	0
Loss from unconsolidated joint ventures				59,840,000	2,570,000	85,110,000
Depreciation and amortization expense				742,293,000	709,035,000	676,666,000
Transaction costs				2,905,000	5,036,000	1,531,000
Operating expense				15,450,000	12,487,000	11,626,000
General and administrative expense				146,378,000	151,573,000	133,112,000
Gains (losses) from investments in securities				(6,453,000)	5,626,000	5,261,000
Other Income - assignment fee				6,624,000	0	0
Interest and other income (loss)				11,940,000	5,704,000	5,953,000
Sales-type and Direct Financing Leases, Profit (Loss)				(10,058,000)	0	0
Gains on sales of real estate				441,075,000	125,198,000	631,945,000
Other revenue				15,450,000	12,487,000	11,626,000
Company's share of Net Operating Income				1,883,796,000	1,735,740,000	1,626,131,000
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue				(28,056,000)	(27,697,000)	(29,641,000)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue				28,056,000	27,697,000	29,641,000
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue				(28,056,000)	(27,697,000)	(29,641,000)
Management Service [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue				28,056,000	27,697,000	29,641,000
Noncontrolling interest - property partnerships [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures				191,812,000	186,304,000	162,887,000
Noncontrolling interest - property partnerships [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures				191,812,000	186,304,000	162,887,000
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures				$ 191,812,000	$ 186,304,000	$ 162,887,000

[1] For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 2,968,412	$ 2,792,160	$ 2,678,795
Rental Revenue: Residential	[1]	57,181	42,668	38,146
Rental Revenue Total	[1]	$ 3,065,075	$ 2,848,437	$ 2,724,419
Rental Revenue: % of Grand Totals		100.00%	100.00%	100.00%
Rental Expenses: Class A Office		$ 1,078,487	$ 996,707	$ 998,469
Rental Expenses: Residential		29,583	24,444	18,739
Rental Expenses: Total		$ 1,135,548	$ 1,034,149	$ 1,030,344
Rental Expenses: % Of Grand Totals		100.00%	100.00%	100.00%
Net Operating Income		$ 1,929,527	$ 1,814,288	$ 1,694,075
Net Operating Income: % of Grand Totals		100.00%	100.00%	100.00%
Company's Share of Net Operating Income: % of Grand Totals		100.00%	100.00%	100.00%
Boston [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 1,005,156	$ 930,560	$ 897,915
Rental Revenue: Residential	[1]	15,086	13,397	13,616
Rental Revenue Total	[1]	$ 1,059,724	$ 957,566	$ 919,009
Rental Revenue: % of Grand Totals		34.58%	33.62%	33.73%
Rental Expenses: Class A Office		$ 360,218	$ 322,298	$ 318,509
Rental Expenses: Residential		5,961	5,811	5,378
Rental Expenses: Total		$ 393,657	$ 341,107	$ 337,023
Rental Expenses: % Of Grand Totals		34.66%	32.98%	32.71%
Net Operating Income		$ 666,067	$ 616,459	$ 581,986
Net Operating Income: % of Grand Totals		34.52%	33.98%	34.35%
Company's Share of Net Operating Income: % of Grand Totals		34.75%	33.98%	33.88%
Los Angeles [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 0	$ 0	$ 0
Rental Revenue: Residential	[1]	0	0	0
Rental Revenue Total	[1]	$ 0	$ 0	$ 0
Rental Revenue: % of Grand Totals		0.00%	0.00%	0.00%
Rental Expenses: Class A Office		$ 0	$ 0	$ 0
Rental Expenses: Residential		0	0	0
Rental Expenses: Total		$ 0	$ 0	$ 0
Rental Expenses: % Of Grand Totals		0.00%	0.00%	0.00%
Net Operating Income		$ 0	$ 0	$ 0
Net Operating Income: % of Grand Totals		0.00%	0.00%	0.00%
Company's Share of Net Operating Income: % of Grand Totals		2.81%	2.98%	3.56%
New York [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 1,031,479	$ 1,012,172	$ 935,966
Rental Revenue: Residential	[1]	0	0	0
Rental Revenue Total	[1]	$ 1,031,479	$ 1,012,172	$ 935,966
Rental Revenue: % of Grand Totals		33.65%	35.53%	34.36%
Rental Expenses: Class A Office		$ 391,293	$ 379,267	$ 384,753
Rental Expenses: Residential		0	0	0
Rental Expenses: Total		$ 391,293	$ 379,267	$ 384,753
Rental Expenses: % Of Grand Totals		34.46%	36.67%	37.35%
Net Operating Income		$ 640,186	$ 632,905	$ 551,213
Net Operating Income: % of Grand Totals		33.18%	34.88%	32.54%
Company's Share of Net Operating Income: % of Grand Totals		26.32%	28.18%	26.12%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 534,397	$ 508,620	$ 508,327
Rental Revenue: Residential	[1]	14,769	3,892	155
Rental Revenue Total	[1]	$ 549,166	$ 512,512	$ 508,482
Rental Revenue: % of Grand Totals		17.92%	17.99%	18.66%
Rental Expenses: Class A Office		$ 183,353	$ 168,040	$ 163,156
Rental Expenses: Residential		11,371	6,717	2,261
Rental Expenses: Total		$ 194,724	$ 174,757	$ 165,417
Rental Expenses: % Of Grand Totals		17.15%	16.90%	16.05%
Net Operating Income		$ 354,442	$ 337,755	$ 343,065
Net Operating Income: % of Grand Totals		18.37%	18.62%	20.25%
Company's Share of Net Operating Income: % of Grand Totals		19.49%	20.27%	22.02%
Seattle
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 31,978	$ 0
Rental Revenue: Residential	[1]	0	0
Rental Revenue Total	[1]	$ 31,978	$ 0
Rental Revenue: % of Grand Totals		1.04%	0.00%
Rental Expenses: Class A Office		$ 8,386	$ 0
Rental Expenses: Residential		0	0
Rental Expenses: Total		$ 8,386	$ 0
Rental Expenses: % Of Grand Totals		0.74%	0.00%
Net Operating Income		$ 23,592	$ 0
Net Operating Income: % of Grand Totals		1.22%	0.00%
Company's Share of Net Operating Income: % of Grand Totals		1.66%	0.14%
Washington, DC [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 365,402	$ 340,808	$ 336,587
Rental Revenue: Residential	[1]	27,326	25,379	24,375
Rental Revenue Total	[1]	$ 392,728	$ 366,187	$ 360,962
Rental Revenue: % of Grand Totals		12.81%	12.86%	13.25%
Rental Expenses: Class A Office		$ 135,237	$ 127,102	$ 132,051
Rental Expenses: Residential		12,251	11,916	11,100
Rental Expenses: Total		$ 147,488	$ 139,018	$ 143,151
Rental Expenses: % Of Grand Totals		12.99%	13.45%	13.89%
Net Operating Income		$ 245,240	$ 227,169	$ 217,811
Net Operating Income: % of Grand Totals		12.71%	12.52%	12.86%
Company's Share of Net Operating Income: % of Grand Totals		14.97%	14.45%	14.42%
Hotel [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	$ 39,482	$ 13,609	$ 7,478
Operating expense		27,478	12,998	13,136
Hotel [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	39,482	13,609	7,478
Operating expense		27,478	12,998	13,136
Hotel [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0	0	0
Operating expense		0	0	0
Hotel [Member] | New York [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0	0	0
Operating expense		0	0	0
Hotel [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0	0	0
Operating expense		0	0	0
Hotel [Member] | Seattle
Segment Reporting Information [Line Items]
Other revenue	[1]	0	0
Operating expense		0	0
Hotel [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0	0	0
Operating expense		0	0	0
Noncontrolling interest - property partnerships [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(191,812)	(186,304)	(162,887)
Noncontrolling interest - property partnerships [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(45,822)	(43,232)	(41,849)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0	0	0
Noncontrolling interest - property partnerships [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(145,990)	(143,072)	(121,038)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0	0	0
Noncontrolling interest - property partnerships [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		0	0
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0	0	0
Unconsolidated Joint Ventures [Member]
Segment Reporting Information [Line Items]
Net Operating Income		146,081	107,756	94,943
Unconsolidated Joint Ventures [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		34,233	16,551	10,765
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		53,023	51,641	57,907
Unconsolidated Joint Ventures [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		1,594	(664)	(5,326)
Unconsolidated Joint Ventures [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		12,785	14,152	14,928
Unconsolidated Joint Ventures [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		7,690	2,498
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		36,756	23,578	16,669
Company's Share [Member]
Segment Reporting Information [Line Items]
Net Operating Income		1,883,796	1,735,740	1,626,131
Company's Share [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		654,478	589,778	550,902
Company's Share [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		53,023	51,641	57,907
Company's Share [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		495,790	489,169	424,849
Company's Share [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		367,227	351,907	357,993
Company's Share [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		31,282	2,498
Company's Share [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		$ 281,996	$ 250,747	$ 234,480

[1] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic Earnings:
Net income attributable to the company's common shareholders / unitholders	$ 111,882	$ 184,537	$ 848,947	$ 496,223	$ 862,227
Net income attributable to the company's common shareholders / unitholders (in shares / units)			156,726,000	156,116,000	155,432,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)			$ 5.42	$ 3.18	$ 5.55
Allocation of undistributed earnings to participating securities			$ (891)	$ 0	$ (748)
Allocation of undistributed earnings to participating securities (in shares / units)			0	0	0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)			$ (0.01)	$ 0	$ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic			$ 848,056	$ 496,223	$ 861,479
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)			156,726,000	156,116,000	155,432,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)			$ 5.41	$ 3.18	$ 5.54
Effect of Dilutive Securities:
Stock Based Compensation			$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)			411,000	260,000	85,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)			$ (0.01)	$ (0.01)	$ 0
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders			$ 848,056	$ 496,223	$ 861,479
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)			157,137,000	156,376,000	155,517,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)			$ 5.40	$ 3.17	$ 5.54
Boston Properties Limited Partnership
Redeemable Common Units			17,634,000	17,034,000	17,211,000
Basic Earnings:
Net income attributable to the company's common shareholders / unitholders			$ 957,265	$ 561,993	$ 979,979
Net income attributable to the company's common shareholders / unitholders (in shares / units)	174,423,000		174,360,000	173,150,000	172,643,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)			$ 5.49	$ 3.25	$ 5.68
Allocation of undistributed earnings to participating securities			$ (991)	$ 0	$ (830)
Allocation of undistributed earnings to participating securities (in shares / units)			0	0	0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)			$ (0.01)	$ 0	$ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic			$ 956,274	$ 561,993	$ 979,149
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)			174,360,000	173,150,000	172,643,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)			$ 5.48	$ 3.25	$ 5.67
Effect of Dilutive Securities:
Stock Based Compensation			$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)			411,000	260,000	85,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)			$ (0.01)	$ (0.01)	$ 0
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders			$ 956,274	$ 561,993	$ 979,149
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)			174,771,000	173,410,000	172,728,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)			$ 5.47	$ 3.24	$ 5.67

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Employee Benefits Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	200.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Defined Contribution Plan, Employer Matching Contribution, Eligible Earnings Limit by IRS Amount	$ 305	$ 290	$ 285
Defined Contribution Plan, Employer Discretionary Contribution Amount	4,800	4,700	$ 4,000
Separate Unrestricted Cash For Deferred Compensation Plan.	32,300	43,600
Deferred Compensation Liability, Current and Noncurrent	31,700	42,700
Officer [Member]
Defined Contribution Plan Disclosure [Line Items]
Separate Unrestricted Cash For Deferred Compensation Plan.	$ 31,700	$ 42,700

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Stock Option and Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 01, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 20, 2021	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period		4 years
Beginning outstanding, shares		103,641	103,641	351,561		395,353
Weighted Average Exercise Price		$ 97.01	$ 97.01	$ 96.97		$ 96.37
MYLTIP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric. The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’s TSR equals the custom index TSR; for relative TSR performance between -1,000 basis points and +1,000 basis points, the number of LTIP Units earned will be determined using linear interpolation.The second component represents the remaining one-half (50%) of the target grant-date value of the 2022 MYLTIP. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’s absolute TSR is greater than -4,000 basis points but less than +6,000 basis points, then the number of LTIP Units earned will be determined using linear interpolation.
Distributions percent before measurement date	10.00%
Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	Earned awards (if any) will vest 100% on January 31, 2025, but may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. Vesting will be accelerated in the event of a change in control, termination of employment by BXP without cause, or termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control.
Value of MYLTIP Awards	$ 17.3
MYLTIP 2022 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued		254,061
MYLTIP 2021 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued			352,021
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance		250,000
Employee discount		85.00%
Number of shares issued		9,813	9,846	7,195
Weighted Average Price of Shares Purchased		$ 87.30	$ 89.73	$ 90.53
stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted		0	0	0
MYLTIP 2020 [Member] | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued				203,278
Minimum [Member] | MYLTIP 2022 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	0
Maximum [Member] | MYLTIP 2022 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	254,061
Maximum [Member] | 2021 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance					5,400,000
Target | MYLTIP 2022 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	127,031

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Stock Option and Incentive Plan Stock and Units (Narrative) (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Feb. 04, 2022 USD ($) shares	Feb. 01, 2022 USD ($)	Feb. 05, 2021 USD ($) shares	Feb. 06, 2020 USD ($) shares	Dec. 31, 2022 USD ($) days $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued | shares					156,836,767	156,623,749
Vesting Period					4 years
Stock based compensation expense					$ 50,700	$ 49,700	$ 43,000
Common Stock, Value, Issued					$ 1,568	$ 1,565
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued | shares					41,818	57,383	29,630
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value Of LTIP Units Issued					$ 28,900	$ 23,800	$ 26,300
Weighted average price (per unit) | $ / shares					$ 103.06	$ 84.43	$ 127.14
Expected life assumed to calculate per unit fair value per LTIP unit (in years)					5 years 8 months 12 days	5 years 8 months 12 days	5 years 8 months 12 days
Risk-free rate					1.71%	0.65%	1.47%
Expected price volatility					31.00%	30.00%	18.00%
MYLTIP 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final awards percentage of target	69.00%
Value of MYLTIP Awards	$ 8,600
Forfeitures, in units | shares	144,043
MYLTIP 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final awards percentage of target			29.20%
Value of MYLTIP Awards			$ 4,600
Forfeitures, in units | shares			285,925
MYLTIP 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final awards percentage of target				83.80%
Value of MYLTIP Awards				$ 17,600
Forfeitures, in units | shares				270,942
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued | shares					9,813	9,846	7,195
Weighted Average Price of Shares Purchased | $ / shares					$ 87.30	$ 89.73	$ 90.53
Number of Business Days, Average Closing Price | days					10
MYLTIP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of MYLTIP Awards		$ 17,300
Vesting Period		3 years
Boston Properties Limited Partnership | LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued | shares					280,616	281,640	207,181
Boston Properties Limited Partnership | MYLTIP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued | shares					254,061
Boston Properties Limited Partnership | MYLTIP 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued | shares						352,021
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share) | $ / shares					$ 0.01
Common Stock, Value, Issued					$ 4,700	$ 5,800	$ 4,000
Common Stock Weighted Average Price (in dollars per share) | $ / shares					$ 111.47	$ 100.60	$ 133.81
LTIP and MYLTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share) | $ / shares					$ 0.25
Ltips (including vested MYLTIPS) And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses					$ 20,600
Unvested MYLTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses					$ 4,900
Weighted-average period (years)					1 year 10 months 24 days

XML

Stock Option Rollforward Table (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Text Block [Abstract]
Beginning outstanding, shares	103,641	351,561	395,353
Exercised	0	(247,920)	(43,792)
Ending outstanding, shares	103,641	103,641	351,561
Beginning outstanding, Weighted-average Exercise Price	$ 97.01	$ 96.97	$ 96.37
Weighted Average Exercise Price	0	96.95	91.60
Ending outstanding, Weighted-average Exercise Price	$ 97.01	$ 97.01	$ 96.97

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Stock Options Outstanding Table (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding, shares	103,641	103,641	351,561	395,353
Weighted Average Exercise Price	$ 97.01	$ 97.01	$ 96.97	$ 96.37
Exercise price $95.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding, shares	54,282
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 months 18 days
Weighted Average Exercise Price	$ 95.69
Number Exercisable	54,282
Exercisable, Weighted Average Exercise Price	$ 95.69
Exercise Price $98.46
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding, shares	49,359
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 month 6 days
Weighted Average Exercise Price	$ 98.46
Number Exercisable	49,359
Exercisable, Weighted Average Exercise Price	$ 98.46

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Related Party Transactions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) ft² nonemployeedirectors shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 16, 2021 shares
Related Party Transaction [Line Items]
Related party note receivable, net	$ 78,576	$ 78,336
Interest and Other Income	$ 11,940	5,704	$ 5,953
Number Of Non Employee Directors Electing To Receive Deferred Stock Units | nonemployeedirectors	7
Separate Unrestricted Cash For Deferred Compensation Plan.	$ 32,300	43,600
Liability for directors	$ 417,545	$ 320,775
Common stock, shares issued | shares	156,836,767	156,623,749
Reedemable deferred stock units, units | shares	97,853	83,073
Boston Properties Limited Partnership
Related Party Transaction [Line Items]
Related party note receivable, net	$ 78,576	$ 78,336
Interest and Other Income	11,940	5,704	5,953
Liability for directors	$ 417,545	$ 320,775
Reedemable deferred stock units, units | shares	97,853	83,073
Three Hudson Boulevard [Member]
Related Party Transaction [Line Items]
Net Rentable Area (in sf) | ft²	2,000,000
Ownership Percentage	25.00%
Related party note receivable, net	$ 80,000
Loans Receivable, Basis Spread on Variable Rate	3.50%
Interest and Other Income	$ 5,600	$ 3,600	2,700
Director Cessation Member [Member]
Related Party Transaction [Line Items]
Common stock, shares issued | shares				498
Director
Related Party Transaction [Line Items]
Separate Unrestricted Cash For Deferred Compensation Plan.	600	900
Liability for directors	600	900
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	0	0	914
Real Estate Brokerage Firm
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1,600	$ 1,900	$ 3,400

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Subsequent Events (Details) $ in Thousands						12 Months Ended
	Feb. 07, 2023 shares	Feb. 03, 2023 USD ($) shares	Jan. 31, 2023 USD ($) a ft²	Jan. 04, 2023 USD ($)	Dec. 31, 2022 ft² shares	Dec. 31, 2022 ft² shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares	Jan. 30, 2023 ft²	Jan. 25, 2023 USD ($) shares	Jan. 05, 2023 ft²	Sep. 08, 2022 ft²	Jun. 15, 2021 USD ($)
Subsequent Event [Line Items]
Line of Credit, Additional Borrowing Capacity | $													$ 500,000
Debt Instrument, Basis Spread on Variable Rate					0.775%
Common stock, shares issued					156,836,767	156,836,767	156,623,749
Restricted Stock [Member]
Subsequent Event [Line Items]
Common stock, shares issued					41,818	41,818	57,383	29,630
Boston Properties Limited Partnership | LTIP Units [Member]
Subsequent Event [Line Items]
Number of shares issued						280,616	281,640	207,181
Construction in Progress
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²					3,200,000	3,200,000
300 Binney Street
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²												195,000
300 Binney Street | Construction in Progress
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²												240,000
Subsequent Event [Member] | 2023 Unsecured Term Loan
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | $				$ 1,200,000
Line of Credit, Additional Borrowing Capacity | $				$ 300,000
Number of extensions				1
Extension Option (in months)				12
Proceeds from Unsecured Lines of Credit | $				$ 1,200,000
Debt Instrument, Interest Rate Terms				At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 1/2 of 1%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating.
Subsequent Event [Member] | 2023 Unsecured Term Loan | Base Rate [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.00%
Subsequent Event [Member] | 2023 Unsecured Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.85%
Subsequent Event [Member] | Minimum [Member] | 2023 Unsecured Term Loan
Subsequent Event [Line Items]
Number of Additional Term Loans				1
Subsequent Event [Member] | Restricted Stock [Member]
Subsequent Event [Line Items]
Common stock, shares issued		64,731
Subsequent Event [Member] | MYLTIP 2023
Subsequent Event [Line Items]
Value of MYLTIP Awards | $										$ 13,100
Subsequent Event [Member] | MYLTIP 2023 | Minimum [Member]
Subsequent Event [Line Items]
Common stock available for issuance										0
Subsequent Event [Member] | MYLTIP 2023 | Maximum [Member]
Subsequent Event [Line Items]
Common stock available for issuance										322,053
Subsequent Event [Member] | MYLTIP 2023 | Target
Subsequent Event [Line Items]
Common stock available for issuance										161,026
Subsequent Event [Member] | MYLTIP 2020 [Member]
Subsequent Event [Line Items]
Final awards percentage of target		50.00%
Value of MYLTIP Awards | $		$ 3,800
Forfeitures, in units		152,460
Subsequent Event [Member] | Boston Properties Limited Partnership | LTIP Units [Member]
Subsequent Event [Line Items]
Number of shares issued	401,543
Subsequent Event [Member] | 290 Binney | Construction in Progress
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²											566,000
Leased percentage											100.00%
Subsequent Event [Member] | 300 Binney Street
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²									195,000
Subsequent Event [Member] | 300 Binney Street | Construction in Progress
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²									240,000
Leased percentage									100.00%
Subsequent Event [Member] | Worldgate Drive
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²			350,000
Payments to Acquire Interest in Joint Venture | $			$ 17,000
Ownership Percentage			50.00%
Number of buildings			2
Number of parking space			1,200
Area of Land | a			10

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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[1]	$ 3,272,368
Original Cost
Original Land		5,373,987
Original Building		14,755,092
Costs Capitalized Subsequent to Acquisition		5,615,135
Land and Improvements	[2]	5,571,327
Building and Improvements	[3]	19,044,812
Land held for development	[4]	721,501	$ 560,355
Development and Construction in Progress		406,574	894,172
Total		25,744,214	24,108,220	$ 23,303,303	$ 22,844,697
Accumulated Depreciation		6,260,992	5,848,183	5,501,637	5,239,179
Furniture, Fixtures and Equipment		50,310	51,695
Aggregate cost for tax purpose		23,100,000
Real Estate Aggregate Accumulated Depreciation For Tax Purposes		5,000,000
Right-of-use assets - finance leases		237,510	237,507
Right of use assets - operating leases		$ 167,351	169,778
Maximum [Member]
Original Cost
Real Estate and Accumulated Depreciation, Life Used for Depreciation		40 years
Furniture, fixtures, and equipment
Original Cost
Accumulated Depreciation Related to Furniture, Fixtures and Equipment		$ 37,090
Land and Land Improvements [Member]
Original Cost
Right-of-use assets - finance leases		214,165
Right of use assets - operating leases		167,351
Buildings and improvements
Original Cost
Right-of-use assets - finance leases		23,345
767Fifth Avenue (the General Motors Building) | Office Building [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		2,284,510
Original Cost
Original Land		1,796,252
Original Building		1,532,654
Costs Capitalized Subsequent to Acquisition		325,762
Land and Improvements		1,796,252
Building and Improvements		1,858,416
Total		3,654,668
Accumulated Depreciation		$ 457,344
Depreciable Lives (Years)	[5]	(1)
Prudential Center | Office Building [Member]
Original Cost
Original Land		$ 92,077
Original Building		948,357
Costs Capitalized Subsequent to Acquisition		718,028
Land and Improvements		115,639
Building and Improvements		1,510,834
Land held for development		231
Development and Construction in Progress		131,758
Total		1,758,462
Accumulated Depreciation		$ 721,498
Depreciable Lives (Years)	[5]	(1)
Embarcadero Center | Office Building [Member]
Original Cost
Original Land		$ 179,697
Original Building		847,410
Costs Capitalized Subsequent to Acquisition		499,451
Land and Improvements		195,986
Building and Improvements		1,330,572
Total		1,526,558
Accumulated Depreciation		$ 736,748
Depreciable Lives (Years)	[5]	(1)
399 Park Avenue | Office Building [Member]
Original Cost
Original Land		$ 339,200
Original Building		700,358
Costs Capitalized Subsequent to Acquisition		393,821
Land and Improvements		354,107
Building and Improvements		1,079,272
Total		1,433,379
Accumulated Depreciation		$ 445,239
Depreciable Lives (Years)	[5]	(1)
601 Lexington Avenue | Office Building [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		$ 987,858
Original Cost
Original Land		241,600
Original Building		494,782
Costs Capitalized Subsequent to Acquisition		515,644
Land and Improvements		289,639
Building and Improvements		962,387
Total		1,252,026
Accumulated Depreciation		$ 348,892
Depreciable Lives (Years)	[5]	(1)
Salesforce Tower | Office Building [Member]
Original Cost
Original Land		$ 200,349
Original Building		946,205
Costs Capitalized Subsequent to Acquisition		7,462
Land and Improvements		200,349
Building and Improvements		953,667
Total		1,154,016
Accumulated Depreciation		$ 129,281
Depreciable Lives (Years)	[5]	(1)
200 Clarendon Street and Garage | Office Building [Member]
Original Cost
Original Land		$ 219,543
Original Building		667,884
Costs Capitalized Subsequent to Acquisition		235,129
Land and Improvements		250,512
Building and Improvements		872,044
Total		1,122,556
Accumulated Depreciation		$ 310,318
Depreciable Lives (Years)	[5]	(1)
250 West 55th Street | Office Building [Member]
Original Cost
Original Land		$ 285,263
Original Building		603,167
Costs Capitalized Subsequent to Acquisition		51,800
Land and Improvements		285,263
Building and Improvements		654,967
Total		940,230
Accumulated Depreciation		$ 179,143
Depreciable Lives (Years)	[5]	(1)
100 Federal Street | Office Building [Member]
Original Cost
Original Land		$ 131,067
Original Building		435,954
Costs Capitalized Subsequent to Acquisition		119,341
Land and Improvements		131,067
Building and Improvements		555,295
Total		686,362
Accumulated Depreciation		$ 157,368
Depreciable Lives (Years)	[5]	(1)
Madison Centre | Office Building [Member]
Original Cost
Original Land		$ 104,641
Original Building		564,336
Costs Capitalized Subsequent to Acquisition		2,879
Land and Improvements		104,641
Building and Improvements		567,215
Total		671,856
Accumulated Depreciation		$ 13,611
Depreciable Lives (Years)	[5]	(1)
Times Square Tower | Office Building [Member]
Original Cost
Original Land		$ 165,413
Original Building		380,438
Costs Capitalized Subsequent to Acquisition		121,437
Land and Improvements		169,193
Building and Improvements		498,095
Total		667,288
Accumulated Depreciation		$ 241,474
Depreciable Lives (Years)	[5]	(1)
Carnegie Center | Office Building [Member]
Original Cost
Original Land		$ 142,666
Original Building		316,856
Costs Capitalized Subsequent to Acquisition		168,261
Land and Improvements		94,243
Building and Improvements		476,990
Land held for development		55,919
Development and Construction in Progress		631
Total		627,783
Accumulated Depreciation		$ 252,390
Depreciable Lives (Years)	[5]	(1)
125 Broadway | Office Building [Member]
Original Cost
Original Land		$ 126,364
Original Building		433,662
Costs Capitalized Subsequent to Acquisition		58
Land and Improvements		126,364
Building and Improvements		433,720
Total		560,084
Accumulated Depreciation		$ 4,503
Depreciable Lives (Years)	[5]	(1)
Atlantic Wharf | Office Building [Member]
Original Cost
Original Land		$ 63,988
Original Building		454,537
Costs Capitalized Subsequent to Acquisition		24,158
Land and Improvements		63,988
Building and Improvements		478,695
Total		542,683
Accumulated Depreciation		$ 171,876
Depreciable Lives (Years)	[5]	(1)
Reston Next | Office Building [Member]
Original Cost
Original Land		$ 2,901
Original Building		525,277
Costs Capitalized Subsequent to Acquisition		0
Land and Improvements		2,901
Building and Improvements		525,277
Total		528,178
Accumulated Depreciation		$ 15,293
Depreciable Lives (Years)	[5]	(1)
599 Lexington Avenue | Office Building [Member]
Original Cost
Original Land		$ 81,040
Original Building		100,507
Costs Capitalized Subsequent to Acquisition		245,609
Land and Improvements		87,852
Building and Improvements		339,304
Total		427,156
Accumulated Depreciation		$ 182,121
Depreciable Lives (Years)	[5]	(1)
Fountain Square | Office Building [Member]
Original Cost
Original Land		$ 56,853
Original Building		306,298
Costs Capitalized Subsequent to Acquisition		39,288
Land and Improvements		56,853
Building and Improvements		345,586
Total		402,439
Accumulated Depreciation		$ 104,864
Depreciable Lives (Years)	[5]	(1)
510 Madison Avenue | Office Building [Member]
Original Cost
Original Land		$ 103,000
Original Building		253,665
Costs Capitalized Subsequent to Acquisition		31,682
Land and Improvements		103,000
Building and Improvements		285,347
Total		388,347
Accumulated Depreciation		$ 95,520
Depreciable Lives (Years)	[5]	(1)
325 Main Street | Office Building [Member]
Original Cost
Original Land		$ 21,596
Original Building		312,492
Costs Capitalized Subsequent to Acquisition		0
Land and Improvements		21,596
Total		334,088
Accumulated Depreciation		$ 4,308
Depreciable Lives (Years)	[5]	(1)
680 Folsom Street | Office Building [Member]
Original Cost
Original Land		$ 72,545
Original Building		219,766
Costs Capitalized Subsequent to Acquisition		8,026
Land and Improvements		72,545
Building and Improvements		227,792
Total		300,337
Accumulated Depreciation		$ 72,414
Depreciable Lives (Years)	[5]	(1)
145 Broadway | Office Building [Member]
Original Cost
Original Land		$ 121
Original Building		273,013
Costs Capitalized Subsequent to Acquisition		26,184
Land and Improvements		23,367
Building and Improvements		275,951
Total		299,318
Accumulated Depreciation		$ 26,881
Depreciable Lives (Years)	[5]	(1)
2200 Pennsylvania Avenue | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		183,541
Costs Capitalized Subsequent to Acquisition		113,108
Land and Improvements		104,329
Building and Improvements		192,320
Total		296,649
Accumulated Depreciation		$ 71,410
Depreciable Lives (Years)	[5]	(1)
South of Market and Democracy Tower | Office Building [Member]
Original Cost
Original Land		$ 13,603
Original Building		237,479
Costs Capitalized Subsequent to Acquisition		28,991
Land and Improvements		13,687
Building and Improvements		266,386
Total		280,073
Accumulated Depreciation		$ 98,665
Depreciable Lives (Years)	[5]	(1)
Bay Colony Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 18,789
Original Building		148,451
Costs Capitalized Subsequent to Acquisition		87,804
Land and Improvements		18,789
Building and Improvements		231,828
Land held for development		4,427
Total		255,044
Accumulated Depreciation		$ 105,172
Depreciable Lives (Years)	[5]	(1)
535 Mission Street | Office Building [Member]
Original Cost
Original Land		$ 40,933
Original Building		148,378
Costs Capitalized Subsequent to Acquisition		3,852
Land and Improvements		40,934
Building and Improvements		152,229
Total		193,163
Accumulated Depreciation		$ 42,776
Depreciable Lives (Years)	[5]	(1)
Mountain View Research Park | Office Building [Member]
Original Cost
Original Land		$ 95,066
Original Building		68,373
Costs Capitalized Subsequent to Acquisition		21,270
Land and Improvements		95,066
Building and Improvements		89,643
Total		184,709
Accumulated Depreciation		$ 28,575
Depreciable Lives (Years)	[5]	(1)
Reservoir Place | Office Building [Member]
Original Cost
Original Land		$ 18,605
Original Building		104,124
Costs Capitalized Subsequent to Acquisition		55,359
Land and Improvements		20,108
Building and Improvements		156,915
Land held for development		1,065
Total		178,088
Accumulated Depreciation		$ 85,394
Depreciable Lives (Years)	[5]	(1)
1330 Connecticut Avenue | Office Building [Member]
Original Cost
Original Land		$ 25,982
Original Building		82,311
Costs Capitalized Subsequent to Acquisition		38,047
Land and Improvements		27,135
Building and Improvements		119,205
Total		146,340
Accumulated Depreciation		$ 48,273
Depreciable Lives (Years)	[5]	(1)
One Freedom Square | Office Building [Member]
Original Cost
Original Land		$ 9,929
Original Building		84,504
Costs Capitalized Subsequent to Acquisition		51,743
Land and Improvements		11,293
Building and Improvements		134,883
Total		146,176
Accumulated Depreciation		$ 66,084
Depreciable Lives (Years)	[5]	(1)
880 Winter Street [Member] | Office Building [Member]
Original Cost
Original Land		$ 15,597
Original Building		37,255
Costs Capitalized Subsequent to Acquisition		91,537
Land and Improvements		15,597
Building and Improvements		128,792
Total		144,389
Accumulated Depreciation		$ 2,560
Depreciable Lives (Years)	[5]	(1)
Kingstowne Towne Center | Office Building [Member]
Original Cost
Original Land		$ 18,021
Original Building		109,038
Costs Capitalized Subsequent to Acquisition		3,822
Land and Improvements		18,062
Building and Improvements		112,819
Total		130,881
Accumulated Depreciation		$ 52,543
Depreciable Lives (Years)	[5]	(1)
140 Kendrick Street | Office Building [Member]
Original Cost
Original Land		$ 18,095
Original Building		66,905
Costs Capitalized Subsequent to Acquisition		42,528
Land and Improvements		19,092
Building and Improvements		102,625
Development and Construction in Progress		5,811
Total		127,528
Accumulated Depreciation		$ 41,627
Depreciable Lives (Years)	[5]	(1)
Shady Grove Innovation District [Member] | Office Building [Member]
Original Cost
Original Land		$ 52,030
Original Building		64,212
Costs Capitalized Subsequent to Acquisition		7,219
Land and Improvements		26,834
Building and Improvements		34,988
Land held for development		61,639
Total		123,461
Accumulated Depreciation		$ 3,319
Depreciable Lives (Years)	[5]	(1)
One and Two Reston Overlook | Office Building [Member]
Original Cost
Original Land		$ 16,456
Original Building		66,192
Costs Capitalized Subsequent to Acquisition		40,516
Land and Improvements		16,179
Building and Improvements		106,985
Total		123,164
Accumulated Depreciation		$ 57,631
Depreciable Lives (Years)	[5]	(1)
Weston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 25,753
Original Building		92,312
Costs Capitalized Subsequent to Acquisition		968
Land and Improvements		25,854
Building and Improvements		93,179
Total		119,033
Accumulated Depreciation		$ 38,385
Depreciable Lives (Years)	[5]	(1)
17Fifty Presidents Street | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		113,362
Costs Capitalized Subsequent to Acquisition		162
Land and Improvements		0
Building and Improvements		113,524
Total		113,524
Accumulated Depreciation		$ 12,232
Depreciable Lives (Years)	[5]	(1)
Discovery Square | Office Building [Member]
Original Cost
Original Land		$ 11,198
Original Building		71,782
Costs Capitalized Subsequent to Acquisition		21,618
Land and Improvements		12,533
Building and Improvements		92,065
Total		104,598
Accumulated Depreciation		$ 54,116
Depreciable Lives (Years)	[5]	(1)
355 Main Street | Office Building [Member]
Original Cost
Original Land		$ 18,863
Original Building		53,346
Costs Capitalized Subsequent to Acquisition		25,418
Land and Improvements		21,173
Building and Improvements		76,454
Total		97,627
Accumulated Depreciation		$ 34,399
Depreciable Lives (Years)	[5]	(1)
10 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 1,953
Original Building		85,752
Costs Capitalized Subsequent to Acquisition		6,406
Land and Improvements		2,290
Building and Improvements		91,821
Total		94,111
Accumulated Depreciation		$ 20,616
Depreciable Lives (Years)	[5]	(1)
Two Freedom Square | Office Building [Member]
Original Cost
Original Land		$ 13,930
Original Building		77,739
Costs Capitalized Subsequent to Acquisition		317
Land and Improvements		15,420
Building and Improvements		76,566
Total		91,986
Accumulated Depreciation		$ 35,850
Depreciable Lives (Years)	[5]	(1)
200 West Street | Office Building [Member]
Original Cost
Original Land		$ 16,148
Original Building		24,983
Costs Capitalized Subsequent to Acquisition		49,264
Land and Improvements		16,813
Building and Improvements		73,265
Land held for development		317
Total		90,395
Accumulated Depreciation		$ 23,428
Depreciable Lives (Years)	[5]	(1)
90 Broadway | Office Building [Member]
Original Cost
Original Land		$ 19,104
Original Building		52,078
Costs Capitalized Subsequent to Acquisition		18,876
Land and Improvements		20,785
Building and Improvements		69,273
Total		90,058
Accumulated Depreciation		$ 29,294
Depreciable Lives (Years)	[5]	(1)
153 & 211 Second Avenue [Member] | Office Building [Member]
Original Cost
Original Land		$ 33,233
Original Building		55,940
Costs Capitalized Subsequent to Acquisition		202
Land and Improvements		33,233
Building and Improvements		55,940
Land held for development		202
Total		89,375
Accumulated Depreciation		$ 4,808
Depreciable Lives (Years)	[5]	(1)
230 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 13,189
Original Building		49,823
Costs Capitalized Subsequent to Acquisition		24,604
Land and Improvements		13,807
Building and Improvements		73,809
Total		87,616
Accumulated Depreciation		$ 38,306
Depreciable Lives (Years)	[5]	(1)
20 Citypoint | Office Building [Member]
Original Cost
Original Land		$ 4,887
Original Building		72,764
Costs Capitalized Subsequent to Acquisition		7,072
Land and Improvements		4,887
Building and Improvements		79,836
Total		84,723
Accumulated Depreciation		$ 9,606
Depreciable Lives (Years)	[5]	(1)
Waltham Weston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 10,385
Original Building		60,694
Costs Capitalized Subsequent to Acquisition		12,859
Land and Improvements		11,097
Building and Improvements		72,841
Total		83,938
Accumulated Depreciation		$ 42,839
Depreciable Lives (Years)	[5]	(1)
77 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 13,847
Original Building		60,383
Costs Capitalized Subsequent to Acquisition		9,701
Land and Improvements		14,023
Building and Improvements		69,908
Total		83,931
Accumulated Depreciation		$ 32,578
Depreciable Lives (Years)	[5]	(1)
Sumner Square | Office Building [Member]
Original Cost
Original Land		$ 624
Original Building		28,745
Costs Capitalized Subsequent to Acquisition		49,302
Land and Improvements		28,205
Building and Improvements		50,466
Total		78,671
Accumulated Depreciation		$ 31,436
Depreciable Lives (Years)	[5]	(1)
2440 West El Camino Real | Office Building [Member]
Original Cost
Original Land		$ 16,741
Original Building		51,285
Costs Capitalized Subsequent to Acquisition		6,391
Land and Improvements		16,741
Building and Improvements		57,676
Total		74,417
Accumulated Depreciation		$ 19,375
Depreciable Lives (Years)	[5]	(1)
300 Binney Street | Office Building [Member]
Original Cost
Original Land		$ 18,080
Original Building		51,262
Costs Capitalized Subsequent to Acquisition		1,268
Land and Improvements		18,080
Building and Improvements		51,402
Land held for development		1,128
Total		70,610
Accumulated Depreciation		$ 18,995
Depreciable Lives (Years)	[5]	(1)
Reston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 9,135
Original Building		50,857
Costs Capitalized Subsequent to Acquisition		5,579
Land and Improvements		10,148
Building and Improvements		55,423
Total		65,571
Accumulated Depreciation		$ 33,822
Depreciable Lives (Years)	[5]	(1)
Wisconsin Place | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		53,349
Costs Capitalized Subsequent to Acquisition		11,204
Land and Improvements		0
Building and Improvements		64,553
Total		64,553
Accumulated Depreciation		$ 26,659
Depreciable Lives (Years)	[5]	(1)
255 Main Street | Office Building [Member]
Original Cost
Original Land		$ 134
Original Building		25,110
Costs Capitalized Subsequent to Acquisition		33,597
Land and Improvements		548
Building and Improvements		58,293
Total		58,841
Accumulated Depreciation		$ 42,204
Depreciable Lives (Years)	[5]	(1)
University Place | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		37,091
Costs Capitalized Subsequent to Acquisition		15,903
Land and Improvements		5,425
Building and Improvements		47,569
Total		52,994
Accumulated Depreciation		$ 35,296
Depreciable Lives (Years)	[5]	(1)
890 Winter Street | Office Building [Member]
Original Cost
Original Land		$ 13,913
Original Building		28,557
Costs Capitalized Subsequent to Acquisition		6,998
Land and Improvements		13,913
Building and Improvements		35,555
Total		49,468
Accumulated Depreciation		$ 5,409
Depreciable Lives (Years)	[5]	(1)
Capital Gallery | Office Building [Member]
Original Cost
Original Land		$ 4,725
Original Building		29,565
Costs Capitalized Subsequent to Acquisition		9,544
Land and Improvements		8,662
Building and Improvements		35,172
Total		43,834
Accumulated Depreciation		$ 22,415
Depreciable Lives (Years)	[5]	(1)
North First Business Park | Office Building [Member]
Original Cost
Original Land		$ 23,398
Original Building		13,069
Costs Capitalized Subsequent to Acquisition		5,288
Land and Improvements		23,378
Building and Improvements		18,377
Total		41,755
Accumulated Depreciation		$ 17,270
Depreciable Lives (Years)	[5]	(1)
150 Broadway | Office Building [Member]
Original Cost
Original Land		$ 850
Original Building		25,042
Costs Capitalized Subsequent to Acquisition		15,726
Land and Improvements		1,323
Building and Improvements		40,295
Total		41,618
Accumulated Depreciation		$ 16,841
Depreciable Lives (Years)	[5]	(1)
105 Broadway | Office Building [Member]
Original Cost
Original Land		$ 1,299
Original Building		12,943
Costs Capitalized Subsequent to Acquisition		12,718
Land and Improvements		2,390
Building and Improvements		24,570
Total		26,960
Accumulated Depreciation		$ 15,578
Depreciable Lives (Years)	[5]	(1)
Lexington Office Park | Office Building [Member]
Original Cost
Original Land		$ 998
Original Building		1,426
Costs Capitalized Subsequent to Acquisition		19,842
Land and Improvements		1,263
Building and Improvements		19,551
Land held for development		1,452
Total		22,266
Accumulated Depreciation		$ 16,716
Depreciable Lives (Years)	[5]	(1)
The Point | Office Building [Member]
Original Cost
Original Land		$ 6,395
Original Building		10,040
Costs Capitalized Subsequent to Acquisition		546
Land and Improvements		6,492
Building and Improvements		10,489
Total		16,981
Accumulated Depreciation		$ 2,308
Depreciable Lives (Years)	[5]	(1)
690 Folsom Street | Office Building [Member]
Original Cost
Original Land		$ 3,219
Original Building		11,038
Costs Capitalized Subsequent to Acquisition		1,877
Land and Improvements		3,219
Building and Improvements		12,915
Total		16,134
Accumulated Depreciation		$ 3,838
Depreciable Lives (Years)	[5]	(1)
33 Hayden Avenue | Office Building [Member]
Original Cost
Original Land		$ 266
Original Building		3,234
Costs Capitalized Subsequent to Acquisition		11,501
Land and Improvements		425
Building and Improvements		14,576
Total		15,001
Accumulated Depreciation		$ 7,929
Depreciable Lives (Years)	[5]	(1)
The Avant Retail | Office Building [Member]
Original Cost
Original Land		$ 1,499
Original Building		6,647
Costs Capitalized Subsequent to Acquisition		2,577
Land and Improvements		1,499
Building and Improvements		9,224
Total		10,723
Accumulated Depreciation		$ 3,210
Depreciable Lives (Years)	[5]	(1)
92-100 Hayden Avenue | Office Building [Member]
Original Cost
Original Land		$ 594
Original Building		6,748
Costs Capitalized Subsequent to Acquisition		2,297
Land and Improvements		778
Building and Improvements		8,861
Total		9,639
Accumulated Depreciation		$ 7,507
Depreciable Lives (Years)	[5]	(1)
32 Hartwell Avenue | Office Building [Member]
Original Cost
Original Land		$ 168
Original Building		1,943
Costs Capitalized Subsequent to Acquisition		6,944
Land and Improvements		314
Building and Improvements		8,741
Total		9,055
Accumulated Depreciation		$ 3,103
Depreciable Lives (Years)	[5]	(1)
250 Binney Street | Office Building [Member]
Original Cost
Original Land		$ 110
Original Building		4,483
Costs Capitalized Subsequent to Acquisition		3,593
Land and Improvements		273
Building and Improvements		7,913
Total		8,186
Accumulated Depreciation		$ 6,974
Depreciable Lives (Years)	[5]	(1)
453 Ravendale Drive | Office Building [Member]
Original Cost
Original Land		$ 5,477
Original Building		1,090
Costs Capitalized Subsequent to Acquisition		677
Land and Improvements		5,477
Building and Improvements		1,767
Total		7,244
Accumulated Depreciation		$ 964
Depreciable Lives (Years)	[5]	(1)
17 Hartwell Avenue | Office Building [Member]
Original Cost
Original Land		$ 26
Original Building		150
Costs Capitalized Subsequent to Acquisition		6,064
Land and Improvements		65
Building and Improvements		6,175
Total		6,240
Accumulated Depreciation		$ 3,530
Depreciable Lives (Years)	[5]	(1)
The Skylyne | Residential Building
Original Cost
Original Land		$ 28,962
Original Building		239,077
Costs Capitalized Subsequent to Acquisition		1,784
Land and Improvements		28,962
Building and Improvements		240,861
Total		269,823
Accumulated Depreciation		$ 14,154
Depreciable Lives (Years)	[5]	(1)
Signature at Reston | Residential Building
Original Cost
Original Land		$ 27,076
Original Building		190,580
Costs Capitalized Subsequent to Acquisition		1,667
Land and Improvements		27,076
Building and Improvements		192,247
Total		219,323
Accumulated Depreciation		$ 23,353
Depreciable Lives (Years)	[5]	(1)
Proto Kendall Square | Residential Building
Original Cost
Original Land		$ 9,243
Original Building		127,248
Costs Capitalized Subsequent to Acquisition		3,336
Land and Improvements		9,245
Building and Improvements		130,582
Total		139,827
Accumulated Depreciation		$ 14,508
Depreciable Lives (Years)	[5]	(1)
The Lofts at Atlantic Wharf | Residential Building
Original Cost
Original Land		$ 3,529
Original Building		54,891
Costs Capitalized Subsequent to Acquisition		2,356
Land and Improvements		3,529
Building and Improvements		57,247
Total		60,776
Accumulated Depreciation		$ 17,174
Depreciable Lives (Years)	[5]	(1)
Boston Cambridge Marriott | Hotel [Member]
Original Cost
Original Land		$ 478
Original Building		37,918
Costs Capitalized Subsequent to Acquisition		32,837
Land and Improvements		1,201
Building and Improvements		69,521
Land held for development		511
Total		71,233
Accumulated Depreciation		$ 51,568
Depreciable Lives (Years)	[5]	(1)
Kendall Center Green Garage | Garage
Original Cost
Original Land		$ 0
Original Building		35,035
Costs Capitalized Subsequent to Acquisition		6,798
Land and Improvements		103
Building and Improvements		41,730
Total		41,833
Accumulated Depreciation		$ 17,039
Depreciable Lives (Years)	[5]	(1)
Kendall Center Yellow Garage | Garage
Original Cost
Original Land		$ 1,256
Original Building		15,697
Costs Capitalized Subsequent to Acquisition		1,653
Land and Improvements		1,434
Building and Improvements		17,172
Total		18,606
Accumulated Depreciation		$ 7,395
Depreciable Lives (Years)	[5]	(1)
Kendall Center Blue Garage | Garage
Original Cost
Original Land		$ 1,163
Original Building		11,633
Costs Capitalized Subsequent to Acquisition		2,111
Land and Improvements		1,579
Building and Improvements		13,328
Total		14,907
Accumulated Depreciation		$ 13,075
Depreciable Lives (Years)	[5]	(1)
2100 Pennsylvania Avenue | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		472,873
Land and Improvements		185,203
Building and Improvements		230,497
Development and Construction in Progress		57,173
Total		472,873
Accumulated Depreciation		$ 9,755
Depreciable Lives (Years)		N/A
190 CityPoint (formerly 180 CityPoint) [Member] | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		140,370
Development and Construction in Progress		140,370
Total		$ 140,370
Depreciable Lives (Years)		N/A
103 CityPoint | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		44,752
Land held for development		74
Development and Construction in Progress		44,678
Total		$ 44,752
Depreciable Lives (Years)		N/A
Reston Next Office Phase II | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		22,954
Development and Construction in Progress		22,954
Total		$ 22,954
Depreciable Lives (Years)		N/A
Reston Next Retail | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		3,199
Development and Construction in Progress		3,199
Total		$ 3,199
Depreciable Lives (Years)		N/A
777 Harrison Street | Land
Original Cost
Original Land		$ 144,647
Original Building		0
Costs Capitalized Subsequent to Acquisition		28,239
Building and Improvements		47
Land held for development		172,839
Total		172,886
Accumulated Depreciation		$ 20
Depreciable Lives (Years)		N/A
Kendall Center Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		148,476
Land held for development		148,476
Total		$ 148,476
Depreciable Lives (Years)		N/A
Back Bay Station Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		72,957
Land held for development		72,957
Total		$ 72,957
Depreciable Lives (Years)		N/A
3625 - 3635 Peterson Way | Land
Original Cost
Original Land		$ 63,206
Original Building		0
Costs Capitalized Subsequent to Acquisition		5,165
Land held for development		68,371
Total		$ 68,371
Depreciable Lives (Years)		N/A
North First Master Plan | Land
Original Cost
Original Land		$ 35,004
Original Building		0
Costs Capitalized Subsequent to Acquisition		3,968
Land held for development		38,972
Total		$ 38,972
Depreciable Lives (Years)		N/A
Plaza at Almaden | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		38,090
Land held for development		38,090
Total		$ 38,090
Depreciable Lives (Years)		N/A
Springfield Metro Center | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		19,891
Land held for development		19,891
Total		$ 19,891
Depreciable Lives (Years)		N/A
CityPoint South Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		19,693
Land held for development		19,693
Total		$ 19,693
Depreciable Lives (Years)		N/A
Reston Gateway Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		12,734
Land held for development		12,734
Total		$ 12,734
Depreciable Lives (Years)		N/A
Weston Quarry | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		1,249
Land held for development		1,249
Total		$ 1,249
Depreciable Lives (Years)		N/A
Broad Run Business Park | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		1,184
Land held for development		1,184
Total		$ 1,184
Depreciable Lives (Years)		N/A
Reston Overlook Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		80
Land held for development		80
Total		$ 80
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[6]	$ 3,272,368
Original Cost
Original Land		5,373,987
Original Building		14,755,092
Costs Capitalized Subsequent to Acquisition		5,247,621
Land and Improvements	[7]	5,476,618
Building and Improvements	[8]	18,772,007
Land held for development	[4]	721,501	560,355
Development and Construction in Progress		406,574	894,172
Total		25,376,700	23,734,833	22,926,494	22,449,476
Accumulated Depreciation		6,143,384	5,736,240	$ 5,396,111	$ 5,135,289
Furniture, Fixtures and Equipment		50,310	51,695
Aggregate cost for tax purpose		25,700,000
Real Estate Aggregate Accumulated Depreciation For Tax Purposes		5,600,000
Debt Issuance Costs, Net		27,632
Right-of-use assets - finance leases		237,510	237,507
Right of use assets - operating leases		$ 167,351	$ 169,778
Boston Properties Limited Partnership | Maximum [Member]
Original Cost
Real Estate and Accumulated Depreciation, Life Used for Depreciation		40 years
Boston Properties Limited Partnership | Furniture, fixtures, and equipment
Original Cost
Accumulated Depreciation Related to Furniture, Fixtures and Equipment		$ 37,090
Boston Properties Limited Partnership | Land and Land Improvements [Member]
Original Cost
Right-of-use assets - finance leases		214,165
Right of use assets - operating leases		167,351
Boston Properties Limited Partnership | Buildings and improvements
Original Cost
Right-of-use assets - finance leases		23,345
Boston Properties Limited Partnership | 767Fifth Avenue (the General Motors Building) | Office Building [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		2,284,510
Original Cost
Original Land		1,796,252
Original Building		1,532,654
Costs Capitalized Subsequent to Acquisition		325,762
Land and Improvements		1,796,252
Building and Improvements		1,858,416
Total		3,654,668
Accumulated Depreciation		$ 457,344
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Prudential Center | Office Building [Member]
Original Cost
Original Land		$ 92,077
Original Building		948,357
Costs Capitalized Subsequent to Acquisition		658,972
Land and Improvements		100,541
Building and Improvements		1,466,876
Land held for development		231
Development and Construction in Progress		131,758
Total		1,699,406
Accumulated Depreciation		$ 702,725
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Embarcadero Center | Office Building [Member]
Original Cost
Original Land		$ 179,697
Original Building		847,410
Costs Capitalized Subsequent to Acquisition		437,070
Land and Improvements		180,419
Building and Improvements		1,283,758
Total		1,464,177
Accumulated Depreciation		$ 716,657
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 399 Park Avenue | Office Building [Member]
Original Cost
Original Land		$ 339,200
Original Building		700,358
Costs Capitalized Subsequent to Acquisition		334,213
Land and Improvements		339,200
Building and Improvements		1,034,571
Total		1,373,771
Accumulated Depreciation		$ 426,148
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 601 Lexington Avenue | Office Building [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		$ 987,858
Original Cost
Original Land		241,600
Original Building		494,782
Costs Capitalized Subsequent to Acquisition		478,558
Land and Improvements		279,281
Building and Improvements		935,659
Total		1,214,940
Accumulated Depreciation		$ 337,421
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Salesforce Tower | Office Building [Member]
Original Cost
Original Land		$ 200,349
Original Building		946,205
Costs Capitalized Subsequent to Acquisition		7,462
Land and Improvements		200,349
Building and Improvements		953,667
Total		1,154,016
Accumulated Depreciation		$ 129,281
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 200 Clarendon Street and Garage | Office Building [Member]
Original Cost
Original Land		$ 219,543
Original Building		667,884
Costs Capitalized Subsequent to Acquisition		235,129
Land and Improvements		250,512
Building and Improvements		872,044
Total		1,122,556
Accumulated Depreciation		$ 310,318
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 250 West 55th Street | Office Building [Member]
Original Cost
Original Land		$ 285,263
Original Building		603,167
Costs Capitalized Subsequent to Acquisition		51,800
Land and Improvements		285,263
Building and Improvements		654,967
Total		940,230
Accumulated Depreciation		$ 179,143
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 100 Federal Street | Office Building [Member]
Original Cost
Original Land		$ 131,067
Original Building		435,954
Costs Capitalized Subsequent to Acquisition		119,341
Land and Improvements		131,067
Building and Improvements		555,295
Total		686,362
Accumulated Depreciation		$ 157,368
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Madison Centre | Office Building [Member]
Original Cost
Original Land		$ 104,641
Original Building		564,336
Costs Capitalized Subsequent to Acquisition		2,879
Land and Improvements		104,641
Building and Improvements		567,215
Total		671,856
Accumulated Depreciation		$ 13,611
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Times Square Tower | Office Building [Member]
Original Cost
Original Land		$ 165,413
Original Building		380,438
Costs Capitalized Subsequent to Acquisition		83,458
Land and Improvements		159,694
Building and Improvements		469,615
Total		629,309
Accumulated Depreciation		$ 229,310
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Carnegie Center | Office Building [Member]
Original Cost
Original Land		$ 142,666
Original Building		316,856
Costs Capitalized Subsequent to Acquisition		153,298
Land and Improvements		90,501
Building and Improvements		465,769
Land held for development		55,919
Development and Construction in Progress		631
Total		612,820
Accumulated Depreciation		$ 247,525
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 125 Broadway | Office Building [Member]
Original Cost
Original Land		$ 126,364
Original Building		433,662
Costs Capitalized Subsequent to Acquisition		58
Land and Improvements		126,364
Building and Improvements		433,720
Total		560,084
Accumulated Depreciation		$ 4,503
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Atlantic Wharf | Office Building [Member]
Original Cost
Original Land		$ 63,988
Original Building		454,537
Costs Capitalized Subsequent to Acquisition		24,158
Land and Improvements		63,988
Building and Improvements		478,695
Total		542,683
Accumulated Depreciation		$ 171,876
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Reston Next | Development
Original Cost
Original Land		$ 2,901
Original Building		525,277
Costs Capitalized Subsequent to Acquisition		0
Land and Improvements		2,901
Building and Improvements		525,277
Total		528,178
Accumulated Depreciation		$ 15,293
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 599 Lexington Avenue | Office Building [Member]
Original Cost
Original Land		$ 81,040
Original Building		100,507
Costs Capitalized Subsequent to Acquisition		218,367
Land and Improvements		81,040
Building and Improvements		318,874
Total		399,914
Accumulated Depreciation		$ 173,396
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Fountain Square | Office Building [Member]
Original Cost
Original Land		$ 56,853
Original Building		306,298
Costs Capitalized Subsequent to Acquisition		39,288
Land and Improvements		56,853
Building and Improvements		345,586
Total		402,439
Accumulated Depreciation		$ 104,864
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 510 Madison Avenue | Office Building [Member]
Original Cost
Original Land		$ 103,000
Original Building		253,665
Costs Capitalized Subsequent to Acquisition		31,682
Land and Improvements		103,000
Building and Improvements		285,347
Total		388,347
Accumulated Depreciation		$ 95,520
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 325 Main Street | Development
Original Cost
Original Land		$ 21,596
Original Building		312,492
Costs Capitalized Subsequent to Acquisition		(193)
Land and Improvements		21,403
Building and Improvements		312,492
Total		333,895
Accumulated Depreciation		$ 4,308
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 680 Folsom Street | Office Building [Member]
Original Cost
Original Land		$ 72,545
Original Building		219,766
Costs Capitalized Subsequent to Acquisition		8,026
Land and Improvements		72,545
Building and Improvements		227,792
Total		300,337
Accumulated Depreciation		$ 72,414
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 145 Broadway | Office Building [Member]
Original Cost
Original Land		$ 121
Original Building		273,013
Costs Capitalized Subsequent to Acquisition		25,981
Land and Improvements		23,164
Building and Improvements		275,951
Total		299,115
Accumulated Depreciation		$ 26,881
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 2200 Pennsylvania Avenue | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		183,541
Costs Capitalized Subsequent to Acquisition		113,108
Land and Improvements		104,329
Building and Improvements		192,320
Total		296,649
Accumulated Depreciation		$ 71,410
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | South of Market and Democracy Tower | Office Building [Member]
Original Cost
Original Land		$ 13,603
Original Building		237,479
Costs Capitalized Subsequent to Acquisition		28,655
Land and Improvements		13,603
Building and Improvements		266,134
Total		279,737
Accumulated Depreciation		$ 98,574
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Bay Colony Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 18,789
Original Building		148,451
Costs Capitalized Subsequent to Acquisition		87,804
Land and Improvements		18,789
Building and Improvements		231,828
Land held for development		4,427
Total		255,044
Accumulated Depreciation		$ 105,172
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 535 Mission Street | Office Building [Member]
Original Cost
Original Land		$ 40,933
Original Building		148,378
Costs Capitalized Subsequent to Acquisition		3,852
Land and Improvements		40,934
Building and Improvements		152,229
Total		193,163
Accumulated Depreciation		$ 42,776
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Mountain View Research Park | Office Building [Member]
Original Cost
Original Land		$ 95,066
Original Building		68,373
Costs Capitalized Subsequent to Acquisition		21,270
Land and Improvements		95,066
Building and Improvements		89,643
Total		184,709
Accumulated Depreciation		$ 28,575
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Reservoir Place | Office Building [Member]
Original Cost
Original Land		$ 18,605
Original Building		104,124
Costs Capitalized Subsequent to Acquisition		51,284
Land and Improvements		19,089
Building and Improvements		153,859
Land held for development		1,065
Total		174,013
Accumulated Depreciation		$ 84,089
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 1330 Connecticut Avenue | Office Building [Member]
Original Cost
Original Land		$ 25,982
Original Building		82,311
Costs Capitalized Subsequent to Acquisition		33,434
Land and Improvements		25,982
Building and Improvements		115,745
Total		141,727
Accumulated Depreciation		$ 46,795
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | One Freedom Square | Office Building [Member]
Original Cost
Original Land		$ 9,929
Original Building		84,504
Costs Capitalized Subsequent to Acquisition		46,106
Land and Improvements		9,883
Building and Improvements		130,656
Total		140,539
Accumulated Depreciation		$ 64,278
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 880 Winter Street [Member] | Development
Original Cost
Original Land		$ 15,597
Original Building		37,255
Costs Capitalized Subsequent to Acquisition		91,537
Land and Improvements		15,597
Building and Improvements		128,792
Total		144,389
Accumulated Depreciation		$ 2,560
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Kingstowne Towne Center | Office Building [Member]
Original Cost
Original Land		$ 18,021
Original Building		109,038
Costs Capitalized Subsequent to Acquisition		3,658
Land and Improvements		18,021
Building and Improvements		112,696
Total		130,717
Accumulated Depreciation		$ 52,498
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 140 Kendrick Street | Office Building [Member]
Original Cost
Original Land		$ 18,095
Original Building		66,905
Costs Capitalized Subsequent to Acquisition		38,538
Land and Improvements		18,095
Building and Improvements		99,632
Development and Construction in Progress		5,811
Total		123,538
Accumulated Depreciation		$ 40,368
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Shady Grove Innovation District [Member] | Office Building [Member]
Original Cost
Original Land		$ 52,030
Original Building		64,212
Costs Capitalized Subsequent to Acquisition		7,219
Land and Improvements		26,834
Building and Improvements		34,988
Land held for development		61,639
Total		123,461
Accumulated Depreciation		$ 3,319
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | One and Two Reston Overlook | Office Building [Member]
Original Cost
Original Land		$ 16,456
Original Building		66,192
Costs Capitalized Subsequent to Acquisition		36,098
Land and Improvements		15,074
Building and Improvements		103,672
Total		118,746
Accumulated Depreciation		$ 56,216
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Weston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 25,753
Original Building		92,312
Costs Capitalized Subsequent to Acquisition		968
Land and Improvements		25,854
Building and Improvements		93,179
Total		119,033
Accumulated Depreciation		$ 38,385
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 17Fifty Presidents Street | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		113,362
Costs Capitalized Subsequent to Acquisition		162
Land and Improvements		0
Building and Improvements		113,524
Total		113,524
Accumulated Depreciation		$ 12,232
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Discovery Square | Office Building [Member]
Original Cost
Original Land		$ 11,198
Original Building		71,782
Costs Capitalized Subsequent to Acquisition		16,073
Land and Improvements		11,146
Building and Improvements		87,907
Total		99,053
Accumulated Depreciation		$ 52,341
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 355 Main Street | Office Building [Member]
Original Cost
Original Land		$ 18,863
Original Building		53,346
Costs Capitalized Subsequent to Acquisition		25,120
Land and Improvements		21,098
Building and Improvements		76,231
Total		97,329
Accumulated Depreciation		$ 34,306
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 10 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 1,953
Original Building		85,752
Costs Capitalized Subsequent to Acquisition		6,243
Land and Improvements		2,127
Building and Improvements		91,821
Total		93,948
Accumulated Depreciation		$ 20,616
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Two Freedom Square | Office Building [Member]
Original Cost
Original Land		$ 13,930
Original Building		77,739
Costs Capitalized Subsequent to Acquisition		(5,895)
Land and Improvements		13,866
Building and Improvements		71,908
Total		85,774
Accumulated Depreciation		$ 33,860
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 200 West Street | Office Building [Member]
Original Cost
Original Land		$ 16,148
Original Building		24,983
Costs Capitalized Subsequent to Acquisition		46,603
Land and Improvements		16,148
Building and Improvements		71,269
Land held for development		317
Total		87,734
Accumulated Depreciation		$ 22,576
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 90 Broadway | Office Building [Member]
Original Cost
Original Land		$ 19,104
Original Building		52,078
Costs Capitalized Subsequent to Acquisition		18,697
Land and Improvements		20,741
Building and Improvements		69,138
Total		89,879
Accumulated Depreciation		$ 29,243
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 153 & 211 Second Avenue [Member] | Office Building [Member]
Original Cost
Original Land		$ 33,233
Original Building		55,940
Costs Capitalized Subsequent to Acquisition		202
Land and Improvements		33,233
Building and Improvements		55,940
Land held for development		202
Total		89,375
Accumulated Depreciation		$ 4,808
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 230 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 13,189
Original Building		49,823
Costs Capitalized Subsequent to Acquisition		22,987
Land and Improvements		13,403
Building and Improvements		72,596
Total		85,999
Accumulated Depreciation		$ 37,791
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 20 Citypoint | Office Building [Member]
Original Cost
Original Land		$ 4,887
Original Building		72,764
Costs Capitalized Subsequent to Acquisition		7,072
Land and Improvements		4,887
Building and Improvements		79,836
Total		84,723
Accumulated Depreciation		$ 9,606
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Waltham Weston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 10,385
Original Building		60,694
Costs Capitalized Subsequent to Acquisition		9,872
Land and Improvements		10,350
Building and Improvements		70,601
Total		80,951
Accumulated Depreciation		$ 41,883
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 77 CityPoint | Office Building [Member]
Original Cost
Original Land		$ 13,847
Original Building		60,383
Costs Capitalized Subsequent to Acquisition		9,596
Land and Improvements		13,997
Building and Improvements		69,829
Total		83,826
Accumulated Depreciation		$ 32,548
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Sumner Square | Office Building [Member]
Original Cost
Original Land		$ 624
Original Building		28,745
Costs Capitalized Subsequent to Acquisition		47,222
Land and Improvements		27,685
Building and Improvements		48,906
Total		76,591
Accumulated Depreciation		$ 30,773
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 2440 West El Camino Real | Office Building [Member]
Original Cost
Original Land		$ 16,741
Original Building		51,285
Costs Capitalized Subsequent to Acquisition		6,391
Land and Improvements		16,741
Building and Improvements		57,676
Total		74,417
Accumulated Depreciation		$ 19,375
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 300 Binney Street | Office Building [Member]
Original Cost
Original Land		$ 18,080
Original Building		51,262
Costs Capitalized Subsequent to Acquisition		1,268
Land and Improvements		18,080
Building and Improvements		51,402
Land held for development		1,128
Total		70,610
Accumulated Depreciation		$ 18,995
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Reston Corporate Center | Office Building [Member]
Original Cost
Original Land		$ 9,135
Original Building		50,857
Costs Capitalized Subsequent to Acquisition		2,968
Land and Improvements		9,496
Building and Improvements		53,464
Total		62,960
Accumulated Depreciation		$ 32,986
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Wisconsin Place | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		53,349
Costs Capitalized Subsequent to Acquisition		11,204
Land and Improvements		0
Building and Improvements		64,553
Total		64,553
Accumulated Depreciation		$ 26,659
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 255 Main Street | Office Building [Member]
Original Cost
Original Land		$ 134
Original Building		25,110
Costs Capitalized Subsequent to Acquisition		31,941
Land and Improvements		134
Building and Improvements		57,051
Total		57,185
Accumulated Depreciation		$ 41,677
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | University Place | Office Building [Member]
Original Cost
Original Land		$ 0
Original Building		37,091
Costs Capitalized Subsequent to Acquisition		14,453
Land and Improvements		5,425
Building and Improvements		46,119
Total		51,544
Accumulated Depreciation		$ 34,270
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 890 Winter Street | Office Building [Member]
Original Cost
Original Land		$ 13,913
Original Building		28,557
Costs Capitalized Subsequent to Acquisition		6,998
Land and Improvements		13,913
Building and Improvements		35,555
Total		49,468
Accumulated Depreciation		$ 5,409
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Capital Gallery | Office Building [Member]
Original Cost
Original Land		$ 4,725
Original Building		29,565
Costs Capitalized Subsequent to Acquisition		4,882
Land and Improvements		6,128
Building and Improvements		33,044
Total		39,172
Accumulated Depreciation		$ 21,506
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | North First Business Park | Office Building [Member]
Original Cost
Original Land		$ 23,398
Original Building		13,069
Costs Capitalized Subsequent to Acquisition		5,265
Land and Improvements		23,372
Building and Improvements		18,360
Total		41,732
Accumulated Depreciation		$ 17,264
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 150 Broadway | Office Building [Member]
Original Cost
Original Land		$ 850
Original Building		25,042
Costs Capitalized Subsequent to Acquisition		13,721
Land and Improvements		822
Building and Improvements		38,791
Total		39,613
Accumulated Depreciation		$ 16,195
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 105 Broadway | Office Building [Member]
Original Cost
Original Land		$ 1,299
Original Building		12,943
Costs Capitalized Subsequent to Acquisition		10,611
Land and Improvements		1,862
Building and Improvements		22,991
Total		24,853
Accumulated Depreciation		$ 14,898
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Lexington Office Park | Office Building [Member]
Original Cost
Original Land		$ 998
Original Building		1,426
Costs Capitalized Subsequent to Acquisition		19,078
Land and Improvements		1,072
Building and Improvements		18,978
Land held for development		1,452
Total		21,502
Accumulated Depreciation		$ 16,474
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | The Point | Office Building [Member]
Original Cost
Original Land		$ 6,395
Original Building		10,040
Costs Capitalized Subsequent to Acquisition		546
Land and Improvements		6,492
Building and Improvements		10,489
Total		16,981
Accumulated Depreciation		$ 2,308
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 690 Folsom Street | Office Building [Member]
Original Cost
Original Land		$ 3,219
Original Building		11,038
Costs Capitalized Subsequent to Acquisition		1,877
Land and Improvements		3,219
Building and Improvements		12,915
Total		16,134
Accumulated Depreciation		$ 3,838
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 33 Hayden Avenue | Office Building [Member]
Original Cost
Original Land		$ 266
Original Building		3,234
Costs Capitalized Subsequent to Acquisition		10,864
Land and Improvements		266
Building and Improvements		14,098
Total		14,364
Accumulated Depreciation		$ 7,725
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | The Avant Retail | Office Building [Member]
Original Cost
Original Land		$ 1,499
Original Building		6,647
Costs Capitalized Subsequent to Acquisition		2,577
Land and Improvements		1,499
Building and Improvements		9,224
Total		10,723
Accumulated Depreciation		$ 3,210
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 92-100 Hayden Avenue | Office Building [Member]
Original Cost
Original Land		$ 594
Original Building		6,748
Costs Capitalized Subsequent to Acquisition		1,568
Land and Improvements		595
Building and Improvements		8,315
Total		8,910
Accumulated Depreciation		$ 7,273
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 32 Hartwell Avenue | Office Building [Member]
Original Cost
Original Land		$ 168
Original Building		1,943
Costs Capitalized Subsequent to Acquisition		6,358
Land and Improvements		168
Building and Improvements		8,301
Total		8,469
Accumulated Depreciation		$ 2,915
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 250 Binney Street | Office Building [Member]
Original Cost
Original Land		$ 110
Original Building		4,483
Costs Capitalized Subsequent to Acquisition		2,939
Land and Improvements		110
Building and Improvements		7,422
Total		7,532
Accumulated Depreciation		$ 6,769
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 453 Ravendale Drive | Office Building [Member]
Original Cost
Original Land		$ 5,477
Original Building		1,090
Costs Capitalized Subsequent to Acquisition		677
Land and Improvements		5,477
Building and Improvements		1,767
Total		7,244
Accumulated Depreciation		$ 964
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 17 Hartwell Avenue | Office Building [Member]
Original Cost
Original Land		$ 26
Original Building		150
Costs Capitalized Subsequent to Acquisition		5,907
Land and Improvements		26
Building and Improvements		6,057
Total		6,083
Accumulated Depreciation		$ 3,479
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | The Skylyne | Residential Building
Original Cost
Original Land		$ 28,962
Original Building		239,077
Costs Capitalized Subsequent to Acquisition		1,784
Land and Improvements		28,962
Building and Improvements		240,861
Total		269,823
Accumulated Depreciation		$ 14,154
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Signature at Reston | Residential Building
Original Cost
Original Land		$ 27,076
Original Building		190,580
Costs Capitalized Subsequent to Acquisition		1,667
Land and Improvements		27,076
Building and Improvements		192,247
Total		219,323
Accumulated Depreciation		$ 23,353
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Proto Kendall Square | Residential Building
Original Cost
Original Land		$ 9,243
Original Building		127,248
Costs Capitalized Subsequent to Acquisition		3,336
Land and Improvements		9,245
Building and Improvements		130,582
Total		139,827
Accumulated Depreciation		$ 14,508
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | The Lofts at Atlantic Wharf | Residential Building
Original Cost
Original Land		$ 3,529
Original Building		54,891
Costs Capitalized Subsequent to Acquisition		2,356
Land and Improvements		3,529
Building and Improvements		57,247
Total		60,776
Accumulated Depreciation		$ 17,174
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Boston Cambridge Marriott | Hotel [Member]
Original Cost
Original Land		$ 478
Original Building		37,918
Costs Capitalized Subsequent to Acquisition		29,946
Land and Improvements		478
Building and Improvements		67,353
Land held for development		511
Total		68,342
Accumulated Depreciation		$ 50,642
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Kendall Center Green Garage | Garage
Original Cost
Original Land		$ 0
Original Building		35,035
Costs Capitalized Subsequent to Acquisition		6,384
Building and Improvements		41,419
Total		41,419
Accumulated Depreciation		$ 16,909
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Kendall Center Yellow Garage | Garage
Original Cost
Original Land		$ 1,256
Original Building		15,697
Costs Capitalized Subsequent to Acquisition		941
Land and Improvements		1,256
Building and Improvements		16,638
Total		17,894
Accumulated Depreciation		$ 7,170
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | Kendall Center Blue Garage | Garage
Original Cost
Original Land		$ 1,163
Original Building		11,633
Costs Capitalized Subsequent to Acquisition		446
Land and Improvements		1,163
Building and Improvements		12,079
Total		13,242
Accumulated Depreciation		$ 12,006
Depreciable Lives (Years)	[9]	(1)
Boston Properties Limited Partnership | 2100 Pennsylvania Avenue | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		472,873
Land and Improvements		185,203
Building and Improvements		230,497
Development and Construction in Progress		57,173
Total		472,873
Accumulated Depreciation		$ 9,755
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | 190 CityPoint (formerly 180 CityPoint) [Member] | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		140,370
Development and Construction in Progress		140,370
Total		140,370
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | 103 CityPoint | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		44,752
Land held for development		74
Development and Construction in Progress		44,678
Total		44,752
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Reston Next Office Phase II | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		22,954
Development and Construction in Progress		22,954
Total		22,954
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Reston Next Retail | Development
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		3,199
Development and Construction in Progress		3,199
Total		3,199
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | 777 Harrison Street | Land
Original Cost
Original Land		$ 144,647
Original Building		0
Costs Capitalized Subsequent to Acquisition		28,239
Building and Improvements		47
Land held for development		172,839
Total		172,886
Accumulated Depreciation		$ 20
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Kendall Center Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		148,476
Land held for development		148,476
Total		148,476
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Back Bay Station Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		72,957
Land held for development		72,957
Total		72,957
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | 3625 - 3635 Peterson Way | Land
Original Cost
Original Land		$ 63,206
Original Building		0
Costs Capitalized Subsequent to Acquisition		5,165
Land held for development		68,371
Total		68,371
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | North First Master Plan | Land
Original Cost
Original Land		$ 35,004
Original Building		0
Costs Capitalized Subsequent to Acquisition		3,968
Land held for development		38,972
Total		38,972
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Plaza at Almaden | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		38,090
Land held for development		38,090
Total		38,090
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Springfield Metro Center | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		19,891
Land held for development		19,891
Total		19,891
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | CityPoint South Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		19,693
Land held for development		19,693
Total		19,693
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Reston Gateway Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		12,734
Land held for development		12,734
Total		12,734
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Weston Quarry | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		1,249
Land held for development		1,249
Total		1,249
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Broad Run Business Park | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		1,184
Land held for development		1,184
Total		1,184
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A
Boston Properties Limited Partnership | Reston Overlook Master Plan | Land
Original Cost
Original Land		$ 0
Original Building		0
Costs Capitalized Subsequent to Acquisition		80
Land held for development		80
Total		80
Accumulated Depreciation		$ 0
Depreciable Lives (Years)		N/A

[1] Includes unamortized deferred financing costs totaling approximately $27,632.

[2] Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

[3] Includes Right of Use Assets - Finance Leases of approximately $23,345.

[4] Includes pre-development costs.

[5] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

[6] Includes unamortized deferred financing costs totaling approximately $27,632.

[7] Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $167,351, respectively.

[8] Includes Right of Use Assets - Finance Leases of approximately $23,345.

[9] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the year	$ 24,108,220	$ 23,303,303	$ 22,844,697
Additions to / improvements of real estate	2,228,000	1,145,084	996,989
Assets sold/written-off	(592,006)	(340,167)	(538,383)
Balance at the end of the year	25,744,214	24,108,220	23,303,303
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at the beginning of the year	5,848,183	5,501,637	5,239,179
Depreciation expense	646,020	623,854	573,898
Assets sold/written-off	(233,211)	(277,308)	(311,440)
Balance at the end of the year	6,260,992	5,848,183	5,501,637
Boston Properties Limited Partnership
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the year	23,734,833	22,926,494	22,449,476
Additions to / improvements of real estate	2,228,000	1,145,084	996,989
Assets sold/written-off	(586,133)	(336,745)	(519,971)
Balance at the end of the year	25,376,700	23,734,833	22,926,494
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at the beginning of the year	5,736,240	5,396,111	5,135,289
Depreciation expense	638,538	615,553	566,813
Assets sold/written-off	(231,394)	(275,424)	(305,991)
Balance at the end of the year	$ 6,143,384	$ 5,736,240	$ 5,396,111