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, 2023

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: 1-13199 (SL Green Realty Corp.)

Commission File Number: 33-167793-02 (SL Green Operating Partnership, L.P.)

______________________________________________________________________

SL GREEN REALTY CORP.

SL GREEN OPERATING PARTNERSHIP, L.P.

(Exact name of registrant as specified in its charter)

______________________________________________________________________

SL Green Realty Corp.	Maryland	13-3956775
SL Green Operating Partnership, L.P.	Delaware	13-3960938
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Vanderbilt Avenue, New York, NY 10017

(Address of principal executive offices—Zip Code)

(212) 594-2700

(Registrant's telephone number, including area code)

______________________________________________________________________

SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

Registrant	Trading Symbol	Title of Each Class	Name of Each Exchange on Which Registered
SL Green Realty Corp.	SLG	Common Stock, $0.01 par value	New York Stock Exchange
SL Green Realty Corp.	SLG.PRI	6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value	New York Stock Exchange

SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: None

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

SL Green Realty Corp.    Yes x    No o                SL Green Operating Partnership, L.P.    Yes o    No x

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

SL Green Realty Corp.    Yes o    No x                SL Green Operating Partnership, L.P.    Yes o    No x

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. 

SL Green Realty Corp.    Yes x    No o                SL Green Operating Partnership, L.P.    Yes x    No o

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). 

SL Green Realty Corp.     Yes x    No o                SL Green Operating Partnership, L.P.    Yes x    No o

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.

SL Green Realty Corp.

Large Accelerated Filer	x	Accelerated Filer	o
Non-Accelerated Filer	o
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 provided pursuant to Section 13(a) of the Exchange Act.			o
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.			☒

SL Green Operating Partnership, L.P.

Large Accelerated Filer	o	Accelerated Filer	o
Non-accelerated filer	x
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 provided pursuant to Section 13(a) of the Exchange Act.			o
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.			☒
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.			o
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).			o

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

SL Green Realty Corp.    Yes ☐    No x                SL Green Operating Partnership, L.P.    Yes ☐    No x

The aggregate market value of the common stock held by non-affiliates of SL Green Realty Corp. (57,620,886 shares) was $1.7 billion based on the quoted closing price on the New York Stock Exchange for such shares on June 30, 2023.

As of February 22, 2024, 64,799,013 shares of SL Green Realty Corp.'s common stock, par value $0.01 per share, were outstanding. As of February 22, 2024, 306,110 common units of limited partnership interest of SL Green Operating Partnership, L.P. were held by non-affiliates. There is no established trading market for such units.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the SL Green Realty Corp.'s Proxy Statement for its 2024 Annual Stockholders' Meeting to be filed within 120 days after the end of the Registrant's fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K.

EXPLANATORY NOTE

This report combines the annual reports on Form 10-K for the year ended December 31, 2023 of SL Green Realty Corp. and SL Green Operating Partnership, L.P. Unless stated otherwise or the context otherwise requires, references to "SL Green Realty Corp.," the "Company" or "SL Green" mean SL Green Realty Corp. and its consolidated subsidiaries, including SL Green Operating Partnership, L.P.; and references to "SL Green Operating Partnership, L.P.," the "Operating Partnership" or "SLGOP" mean SL Green Operating Partnership, L.P. and its consolidated subsidiaries. The terms "we," "our" and "us" mean the Company and all the entities owned or controlled by the Company, including the Operating Partnership.

The Company is a Maryland corporation which operates as a self-administered and self-managed real estate investment trust, or REIT, and is the sole managing general partner of the Operating Partnership. As a general partner of the Operating Partnership, the Company has full, exclusive and complete responsibility and discretion in the day-to-day management and control of the Operating Partnership.

As of December 31, 2023, the Company owns 94.25% of the outstanding general and limited partnership interest in the Operating Partnership and owns 9,200,000 Series I Preferred Units of the Operating Partnership. As of December 31, 2023, noncontrolling investors held, in aggregate, a 5.75% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership.

The Company and the Operating Partnership are managed and operated as one entity. The financial results of the Operating Partnership are consolidated into the financial statements of the Company. The Company has no significant assets other than its investment in the Operating Partnership. Substantially all of our assets are held by, and our operations are conducted through, the Operating Partnership. Therefore, the assets and liabilities of the Company and the Operating Partnership are substantially the same.

Noncontrolling interests in the Operating Partnership, stockholders' equity of the Company and partners' capital of the Operating Partnership are the main areas of difference between the consolidated financial statements of the Company and those of the Operating Partnership. The common limited partnership interests in the Operating Partnership not owned by the Company are accounted as noncontrolling interests, within mezzanine equity, in the Company's and the Operating Partnership's consolidated financial statements.

We believe combining the annual reports on Form 10-K of the Company and the Operating Partnership into this single report results in the following benefits:

•Combined reports enhance investors' understanding of the Company and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business;

•Combined reports eliminate duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the Company's disclosure applies to both the Company and the Operating Partnership; and

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

To help investors understand the significant differences between the Company and the Operating Partnership, this report presents the following separate sections for each of the Company and the Operating Partnership:

•consolidated financial statements; and

•the following notes to the consolidated financial statements:

◦Note 11, Noncontrolling Interests on the Company’s Consolidated Financial Statements;

◦Note 12, Stockholders' Equity of the Company; and

◦Note 13, Partners' Capital of the Operating Partnership;

This report also includes separate Part II, Item 5. Market for Registrants' Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities, and Item 9A. Controls and Procedures sections and separate Exhibit 31 and 32 certifications for each of the Company and the Operating Partnership, respectively, in order to establish that the Chief Executive Officer and the Chief Financial Officer of the Company, in both their capacity as the principal executive officer and principal financial officer of the Company and the principal executive officer and principal financial officer of the general partner of the Operating Partnership, have made the requisite certifications and that the Company and the Operating Partnership are compliant with Rule 13a-15 and Rule 15d-15 of the Securities Exchange Act of 1934, as amended, or the Exchange Act.

SL GREEN REALTY CORP. AND SL GREEN OPERATING PARTNERSHIP, L.P.

TABLE OF CONTENTS

PART I
Item 1.	Business	4
Item 1A.	Risk Factors	13
Item 1B.	Unresolved Staff Comments	24
Item 1C.	Cybersecurity	24
Item 2.	Properties	25
Item 3.	Legal Proceedings	31
Item 4.	Mine Safety Disclosures	31
PART II
Item 5.	Market for Registrants' Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	32
Item 6.	Reserved	32
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	33
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	53
Item 8.	Financial Statements and Supplementary Data	55
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	125
Item 9A.	Controls and Procedures	126
Item 9B.	Other Information	130
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	131
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	132
Item 11.	Executive Compensation	132
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	132
Item 13.	Certain Relationships and Related Transactions, and Director Independence	132
Item 14.	Principal Accountant Fees and Services	132
PART IV
Item 15.	Exhibits, Financial Statements and Schedules	133
	SIGNATURES	138

PART I

ITEM 1. BUSINESS

General

SL Green Realty Corp. is a self-managed real estate investment trust, or REIT, engaged in the ownership, management, operation, acquisition, development, redevelopment and repositioning of commercial real estate properties, principally office properties, located in the New York metropolitan area, principally in Manhattan, a borough of New York City. We were formed in June, 1997 for the purpose of continuing the commercial real estate business of S.L. Green Properties, Inc., our predecessor entity. S.L. Green Properties, Inc., which was founded in 1980 by Stephen L. Green, who serves as a member and the chairman emeritus of the Company's board of directors, had been engaged in the business of owning, managing, leasing, and repositioning office properties in Manhattan.

As of December 31, 2023, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet	Number of Properties	Approximate Square Feet	Number of Properties		Approximate Square Feet		Weighted Average Leased Occupancy(1)
Commercial:
Manhattan	Office	13	(2)	8,399,141	12	15,412,174	25	(2)	23,811,315	(2)	89.4	%
	Retail	3	(2)	40,536	7	281,796	10	(2)	322,332	(2)	91.2	%
	Development/Redevelopment	3	(3)	1,443,771	3	2,893,357	6	(2)	4,337,128	(2)	N/A
		19		9,883,448	22	18,587,327	41		28,470,775		89.5	%
Suburban	Office	7		862,800	—	—	7		862,800		77.1	%
Total commercial properties		26		10,746,248	22	18,587,327	48		29,333,575		89.0	%
Residential:
Manhattan	Residential	1	(3)	140,382	1	221,884	2		362,266		99.0	%
Total portfolio		27		10,886,630	23	18,809,211	50		29,695,841		89.2	%

(1)The weighted average leased occupancy for commercial properties represents the total leased square footage divided by total square footage at acquisition. The weighted average leased occupancy for residential properties represents the total leased units divided by total available units. Properties under construction are not included in the calculation of weighted average leased occupancy.

(2)Includes assets within the Company's alternative strategy portfolio. Within that portfolio, office includes one building totaling 2,048,725 square feet, retail includes eight buildings totaling 286,738 square feet and development/redevelopment includes two buildings totaling 1,496,931 square feet.

(3)As of December 31, 2023, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

As of December 31, 2023, we also managed one office building and one retail building owned by a third party encompassing approximately 0.4 million square feet, and held debt and preferred equity investments with a book value of $346.7 million, excluding debt and preferred equity investments and other financing receivables totaling $7.9 million that are included in balance sheet line items other than the Debt and preferred equity investments line item.

Our corporate offices are located in midtown Manhattan at One Vanderbilt Avenue, New York, New York 10017. As of December 31, 2023, we employed 1,188 employees, 308 of whom were employed in our corporate offices. We maintain a website at www.slgreen.com and can be contacted at (212) 594-2700 or by email at investor.relations@slgreen.com. On our website, you can obtain, free of charge, a copy of our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we file such material electronically with, or furnish it to, the Securities and Exchange Commission, or the SEC. We have also made available on our website our audit committee charter, compensation committee charter, nominating and corporate governance committee charter, code of business conduct and ethics and corporate governance principles. We do not intend for information contained on our website to be part of this annual report on Form 10-K. The SEC maintains a website (http://www.sec.gov) that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

4

Unless the context requires otherwise, all references to the "Company," "SL Green," "we," "our" and "us" in this annual report means SL Green Realty Corp., a Maryland corporation, and one or more of its subsidiaries, including the Operating Partnership, or, as the context may require, SL Green only or the Operating Partnership only, and "S.L. Green Properties" means S.L. Green Properties, Inc., a New York corporation, as well as the affiliated partnerships and other entities through which Stephen L. Green historically conducted commercial real estate activities.

Corporate Structure

In connection with the Company's initial public offering, or IPO, in August 1997, the Operating Partnership received a contribution of interests in real estate properties as well as a 95% economic, non-voting interest in the management, leasing and construction companies affiliated with S.L. Green Properties. We refer to these management, leasing and construction entities, which are owned by S.L. Green Management Corp, as the "Service Corporation." The Company is organized so as to qualify, and has elected to qualify as a REIT, under the Internal Revenue Code of 1986, as amended, or the Code.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. We are the sole managing general partner of the Operating Partnership, and as of December 31, 2023, we owned 94.25% of its economic interests. All of the management and leasing operations with respect to our wholly-owned properties are conducted through SL Green Management LLC, or Management LLC. The Operating Partnership owns 100% of Management LLC.

In order to maintain the Company's qualification as a REIT while realizing income from management, leasing and construction contracts with third parties and joint venture properties, all of these service operations are conducted through the S.L. Green Management Corp, or the Service Corporation, a consolidated variable interest entity. We, through our Operating Partnership, receive substantially all of the cash flow from the Service Corporation's operations. All of the voting common stock of the Service Corporation is held by an entity owned and controlled by Stephen L. Green, who serves as a member and as the chairman emeritus of the Company's Board of Directors.

Business and Growth Strategies

SL Green, Manhattan's largest owner of office real estate, is focused primarily on the ownership, management, operation, acquisition, development, redevelopment and repositioning of Manhattan commercial properties, principally office properties.

Our primary business objective is to maximize the total return to stockholders, through dividends, earnings and asset value appreciation. The commercial real estate expertise resulting from owning, operating, investing, developing, redeveloping and lending on real estate in Manhattan for many decades has enabled us to invest in a collection of premier office properties, selected retail and residential assets, and high-quality debt and preferred equity investments.

We are led by a strong, experienced management team that provides a foundation of skills in all aspects of real estate. It is with this team that we have achieved a market leading position in our targeted submarkets.

We seek to enhance the value of our company by executing strategies that include the following:

•Leasing and property management, which capitalizes on our extensive presence and knowledge of the marketplaces in which we operate;

•Acquiring properties and employing our local market skills to reposition these assets to create incremental cash flow and value appreciation;

•Identifying properties well suited for development/redevelopment in order to maximize the value of those properties through development/redevelopment or reconfiguration to match current workplace, retail and housing trends;

•Investing in debt and preferred equity positions that generate consistently strong risk-adjusted returns, increase the breadth of our market insight, foster key market relationships and source potential future investment opportunities;

•Executing dispositions through sales or joint ventures that harvest embedded equity which has been generated through management's value enhancing activities; and

•Maintaining a prudently levered, liquid balance sheet with consistent access to diversified sources of property level and corporate capital.

5

Leasing and Property Management

We seek to capitalize on our management's extensive knowledge of Manhattan and the New York metropolitan area and the needs of our tenants through proactive leasing and management programs, which include: (i) use of in-depth market experience resulting from managing and leasing tens of millions of square feet of office, retail and residential space since the Company was founded; (ii) careful tenant management, which results in a high tenant retention rate, long average lease terms and a manageable lease expiration schedule; (iii) utilization of an extensive network of third-party brokers to supplement our in-house leasing team; (iv) use of comprehensive building management analysis and planning; and (v) a commitment to tenant satisfaction by understanding and appreciating our tenant's businesses and the environment in which they are operating, while providing high quality tenant services at competitive rental rates.

Property Acquisitions

We acquire properties for long-term value appreciation and earnings growth. This strategy has resulted in capital gains that increase our investment capital base. In implementing this strategy, we continually evaluate potential acquisition opportunities. These opportunities may come from new properties as well as the acquisition of properties in which we already hold a joint venture interest or, from time to time, from our debt and preferred equity investments.

Through intimate knowledge of our market, we have developed an ability to source transactions with superior risk-adjusted returns by capturing off-market opportunities. In rising markets, we primarily seek to acquire strategic vacancies that provide the opportunity to take advantage of our exceptional leasing and repositioning capabilities to increase cash flow and property value. In stable or falling markets, we primarily target assets featuring credit tenancies with fully escalated in-place rents to provide cash flow stability near-term and the opportunity for increases over time.

We believe that we have many advantages over our competitors in acquiring core and non-core properties, both directly and through our joint venture program that includes a predominance of high-quality institutional investors. Those advantages include: (i) senior management's long-tenured experience leading a full-service, fully integrated real estate company focused, principally, on the Manhattan market; (ii) the ability to offer tax-efficient structures to sellers through the exchange of ownership interests, including units in our Operating Partnership; and (iii) the ability to underwrite and close transactions on an expedited basis even when the transaction involves a complicated structure.

Property Dispositions

We continually evaluate our portfolio to identify those properties that are most likely to meet our long-term earnings and cash flow growth objectives and contribute to increasing portfolio value. Properties that no longer meet our objectives are evaluated for sale or joint venture, to release equity created through management's value enhancement programs or to take advantage of attractive market valuations.

We seek to efficiently deploy the capital proceeds generated from these dispositions into other property acquisitions, development or redevelopment projects or debt and preferred equity investments that we expect will provide enhanced future capital gains and earnings growth opportunities. Management may also elect to utilize the capital proceeds from these dispositions to repurchase shares of our common stock, repay existing indebtedness of the Company or its subsidiaries, or increase cash liquidity.

Property Repositioning

Our extensive knowledge of the market in which we operate and our ability to efficiently plan and execute capital projects provide the expertise to enhance returns by repositioning properties that are underperforming. Many of the properties we own or seek to acquire feature unique architectural design elements or other amenities and characteristics that can be appealing to tenants when fully exploited. Our strategic investment in these properties, combined with our active management and pro-active leasing, provide the opportunity to creatively meet market needs and generate favorable returns.

Development / Redevelopment

Our constant interactions with tenants and other market participants keep us abreast of innovations in workplace layout, amenitization, store design and smart living. We leverage this information to identify properties primed for development or redevelopment to meet these demands and unlock value. The expertise and relationships that we have built from managing complex construction projects in New York City and its surrounding areas allow us to cost efficiently add new and renovated assets of the highest quality and desirability to our operating portfolio.

6

Debt and Preferred Equity Investments

We invest in well-collateralized debt and preferred equity investments in the markets in which we operate, principally New York City, that generate attractive yields. See Note 5, "Debt and Preferred Equity Investments," in the accompanying consolidated financial statements. Knowledge of our markets and our leasing and asset management expertise provide underwriting capabilities that enable a highly educated assessment of risk and return. The benefits of this investment program, which has a carefully managed aggregate size, include the following:

•Our typical investments provide high current returns at conservative exposure levels and, in certain cases, the potential for future capital gains. Our expertise and operating capabilities provide both insight and operating skills that mitigate risk.

•In certain instances, these investments may serve as a potential source of real estate acquisitions for us. Property owners may also provide us the opportunity to consider off-market transactions involving other properties because we have previously provided debt or preferred equity financing to them.

•Our debt and preferred equity investment strategy is concentrated in Manhattan, which helps us gain market insight, awareness of upcoming investment opportunities and foster key relationships that may provide access to future investment opportunities.

Capital Resources

Our objective is to maintain multiple sources of efficient corporate and property level capital. This objective is supported by:

•Property operations that generally provide stable cash flows through market cycles, long average lease terms, high credit quality tenants and superior leasing, operating and asset management skills;

•Concentration of our activities in a Manhattan market that is consistently attractive to property investors and lenders through market cycles relative to other markets;

•Maintaining strong corporate liquidity and careful management of future debt maturities; and

•Maintaining access to corporate capital markets through balanced financing and investment activities that result in strong balance sheet and cash flow metrics.

Experience at SUMMIT

SUMMIT One Vanderbilt is an observation deck that offers panoramic views of New York while immersing its visitors in an art experience. SUMMIT opened in October 2021 and welcomed approximately 2.1 million and 1.6 million visitors for the years ended December 31, 2023 and 2022, respectively. Our constant focus and assessment of customer experience includes monitoring crowd volume and wait times for our attractions and services at SUMMIT, allowing us to maximize revenue per customer and adjust operating hours to meet the demand of peak reservation times during the week.

Manhattan Office Market Overview

Manhattan is the largest office market in the United States containing more rentable square feet than the next four largest central business district office markets combined. According to Cushman and Wakefield Research Services, as of December 31, 2023, Manhattan has a total office inventory of approximately 418.9 million square feet, including 263.1 million square feet in midtown. The properties in our portfolio are primarily concentrated in some of Manhattan's most prominent midtown locations.

While the near-term addition of new supply to the Manhattan office inventory is expected to be nominal relative to the size of the overall market, we view new supply in locations near a variety of transportation options as a positive to the Manhattan office market given the older vintage of the majority of Manhattan’s office inventory and the increasing desire of tenants to occupy new, high quality, efficient office space that provides for easy commutability for their employees.

7

According to Cushman and Wakefield Research Services, the total volume of leases signed in Manhattan for the years ended December 31, 2023 and 2022 was 18.0 million and 24.3 million square feet, respectively. Overall average asking rents in Manhattan increased in 2023 by 2.4% from $71.62 per square foot as of December 31, 2022 to $73.33 per square foot as of December 31, 2023, while Manhattan Class A asking rents increased to $80.98 per square foot, up 2.9% from $78.72 as of December 31, 2022. In addition, certain tenant industries saw an increase in leasing volume during the year. Manhattan's diverse tenant base is exemplified by the following tables, which show the percentage of leasing volume attributable to each industry:

	Percent of Manhattan Leasing Volume (1)
Industry	2023		2022
Financial Services	39.1	%	40.1	%
Legal Services	17.2	%	7.6	%
Technology, Advertising, Media, and Information ("TAMI")	15.2	%	18.2	%
Public Sector	12.4	%	7.9	%
Retail/Wholesale	6.2	%	5.7	%
Professional Services	5.6	%	11.4	%
Real Estate	2.2	%	—	%
Other	2.1	%	4.9	%
Health Services	—	%	4.2	%

(1)Source: Cushman and Wakefield Research Services

General Terms of Leases in the Manhattan Markets

Leases entered into for space in Manhattan typically contain terms that may not be contained in leases in other U.S. office markets. The initial term of leases entered into for space in Manhattan is generally seven to fifteen years. Tenants leasing space in excess of 10,000 square feet for an initial term of 10 years or longer often will negotiate an option to extend the term of the lease for one or two renewal periods, typically for a term of five years each. The base rent during the initial term often will provide for agreed-upon periodic increases over the term of the lease. Base rent for renewal terms is most often based upon the then fair market rental value of the premises as of the commencement date of the applicable renewal term (generally determined by binding arbitration in the event the landlord and the tenant are unable to mutually agree upon the fair market value), though base rent for a renewal period may be set at 95% of the then fair market rent. Very infrequently, leases may contain termination options whereby a tenant can terminate the lease obligation before the lease expiration date with payment of a penalty together with repayment of the unamortized portion of the landlord's transaction costs (e.g., brokerage commissions, free rent periods, tenant improvement allowances, etc.).

In addition to base rent, a tenant will generally also pay its pro rata share of increases in real estate taxes and operating expenses for the building over a base year, which is typically the year during which the term of the lease commences, based upon the tenant's proportionate occupancy of the building. In some smaller leases (generally less than 10,000 square feet), in lieu of paying additional rent based upon increases in building operating expenses, base rent will be increased each year during the lease term by a set percentage on a compounding basis (though the tenant will still pay its pro rata share of increases in real estate taxes over a base year).

Tenants typically receive a free rent period following commencement of the lease term, which in some cases may coincide with the tenant's construction period.

The landlord most often supplies electricity either on a sub-metered basis at the landlord's cost plus a fixed percentage or on a rent inclusion basis (i.e., a fixed fee is added to the base rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services, other than electricity, such as heat, air conditioning, freight elevator service during business hours and base building cleaning typically are provided at no additional cost, but are included in the building's operating expenses. The tenant will typically pay additional amounts only for services that exceed base building services or for services that are provided other than during normal business hours.

8

In a typical lease for a new tenant renting in excess of 10,000 square feet, the landlord will deliver the premises with existing improvements demolished. In such instances, the landlord will typically provide a tenant improvement allowance, which is a fixed sum that the landlord makes available to the tenant to reimburse the tenant for all or a portion of the tenant's initial construction of its premises. Such sum typically is payable as work progresses, upon submission by the tenant of invoices for the cost of construction and lien waivers. However, in certain leases (most often for relatively small amounts of space), the landlord will construct the premises for the tenant at a cost to the landlord not to exceed an agreed upon amount with the tenant paying any amount in excess of the agreed upon amount. In addition, landlords may rent space to a tenant that is "pre-built" (i.e., space that was constructed by the landlord in advance of lease signing and is ready to for the tenant to move in with the tenant selecting paint and carpet colors).

Occupancy

The following table sets forth the weighted average occupancy rates at our office properties based on space leased for properties owned by us as of December 31, 2023:

	Leased Occupancy as of December 31,
Property	2023	2022
Same-Store office properties - Manhattan (1)	90.0%	91.2%
Manhattan office properties	89.4%	90.7%
Suburban office properties	77.1%	79.3%
Unconsolidated joint venture office properties	91.1%	94.3%
Portfolio (2)	89.2%	90.3%

(1)All office properties located in Manhattan owned by us as of January 1, 2022 and still owned by us in the same manner as of December 31, 2023. Percent Occupied includes leases signed but not yet commenced.

(2)Excludes properties under development or redevelopment.

Rent Trajectory

We are constantly evaluating our schedule of future lease expirations to mitigate occupancy risk while maximizing net effective rents. We proactively manage future lease expirations based on our view of estimated current and future market conditions and asking rents. The following table sets forth our future lease expirations, excluding triple net leases, and management's estimates of market asking rents. Taking rents are typically lower than asking rents and may vary from building to building. There can be no assurances that our estimates of market rents are accurate or that market rents currently prevailing will not erode or outperform in the future.

	ANNUAL LEASE EXPIRATIONS - MANHATTAN OPERATING PROPERTIES
	Consolidated Properties							Joint Venture Properties
Year of Lease Expiration	Number of Expiring Leases (1)	Rentable Square Footage of Expiring Leases	Percentage of Total Sq. Ft.		Annualized Cash Rent of Expiring Leases	Annualized Cash Rent Per Square Foot of Expiring Leases $/psf (2)	Current Weighted Average Asking Rent $/psf (3)	Number of Expiring Leases (2)	Rentable Square Footage of Expiring Leases	Percentage of Total Sq. Ft.		Annualized Cash Rent of Expiring Leases	Annualized Cash Rent Per Square Foot of Expiring Leases $/psf (2)	Current Weighted Average Asking Rent $/psf (3)
2023 (4)	16	177,309	2.30	%	$10,016,868	$56.49	$59.01	6	114,048	0.80	%	$11,892,355	$104.27	$83.77
1st Quarter 2024	9	40,596	0.50	%	$3,623,916	$89.27	$72.65	8	122,938	0.90	%	$13,392,794	$108.94	$105.28
2nd Quarter 2024	19	55,415	0.70	%	3,451,449	62.28	58.02	7	56,635	0.40	%	4,804,151	84.83	71.55
3rd Quarter 2024	11	106,551	1.40	%	4,049,418	38.00	36.79	5	604,236	4.40	%	69,411,649	114.88	81.77
4th Quarter 2024	20	288,851	3.90	%	17,558,046	60.79	57.84	8	48,235	0.30	%	5,240,414	108.64	83.63
Total 2024	59	491,413	6.50	%	$28,682,829	$58.37	$54.52	28	832,044	6.00	%	$92,849,008	$111.59	$84.66
2025	71	680,624	9.00	%	$55,301,323	$81.25	$67.23	26	373,433	2.70	%	$36,125,921	$96.74	$83.31
2026	54	776,991	10.20	%	53,956,330	69.44	65.44	42	802,152	5.80	%	89,411,068	111.46	100.46
2027	55	650,165	8.60	%	52,559,470	80.84	64.19	29	352,724	2.50	%	44,741,842	126.85	113.71
2028	53	698,668	9.20	%	52,371,028	74.96	67.99	30	305,851	2.20	%	35,200,396	115.09	113.74
2029	33	591,177	7.80	%	38,909,520	65.82	60.79	17	893,912	6.40	%	64,603,106	72.27	75.99
2030	22	696,540	9.20	%	49,396,547	70.92	66.02	21	505,445	3.60	%	51,835,737	102.55	90.09
2031	18	321,405	4.20	%	22,841,818	71.07	67.96	27	2,912,088	21.00	%	219,024,122	75.21	76.64
2032	16	669,608	8.80	%	40,664,070	60.73	54.14	15	1,075,978	7.80	%	95,341,186	88.61	91.77
Thereafter	60	1,835,137	24.20	%	112,016,314	61.04	54.67	75	5,714,468	41.20	%	556,177,116	97.33	102.86
	457	7,589,037	100.00	%	$516,716,117	$68.09	$61.07	316	13,882,143	100.00	%	$1,297,201,857	$93.44	$92.91

NOTE: Data excludes space currently occupied by SL Green's corporate offices

(1)Tenants may have multiple leases.

(2)Represents in place annualized rent allocated by year of expiration.

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(3)Management's estimate of current average asking rents for currently occupied space as of December 31, 2023. Taking rents are typically lower than asking rents and may vary from property to property.

(4)Includes month to month holdover tenants that expired prior to December 31, 2023.

Industry Segments

The Company is a REIT that is engaged in the ownership, management, operation, acquisition, development, redevelopment and repositioning of commercial properties, principally office properties, located in the New York metropolitan area, principally Manhattan, and has three reportable segments: real estate, debt and preferred equity investments, and SUMMIT. Our industry segments are discussed in Note 21, "Segment Information," in the accompanying consolidated financial statements.

As of December 31, 2023, our real estate portfolio was principally located in one geographical market, Manhattan, a borough of New York City. The Company's primary sources of real estate revenue are tenant rents, escalations and reimbursement revenue. Real estate property operating expenses consist primarily of cleaning, security, maintenance, utility costs, real estate taxes and, at certain properties, ground rent expense. As of December 31, 2023, one tenant in our office portfolio, Paramount Global (formerly ViacomCBS Inc.), contributed 5.9% of our share of annualized cash rent. No other tenant contributed more than 5.0% of our share of annualized cash rent. No property contributed in excess of 10.0% of our consolidated total revenue for 2023.

As of December 31, 2023, we held debt and preferred equity investments with a book value of $346.7 million, excluding debt and preferred equity investments and other financing receivables totaling $7.9 million that are included in balance sheet line items other than the Debt and preferred equity investments line item. As of December 31, 2023, all of the assets underlying our debt and preferred equity investments were located in New York City. The primary sources of debt and preferred equity revenue are interest and fee income.

As of December 31, 2023, SUMMIT operates one location at One Vanderbilt Avenue in midtown Manhattan with the primary source of revenue generated from ticket sales.

Human Capital

Our employees are our most important asset. We are focused on fostering an inclusive workforce that attracts and retains highly talented and diverse individuals. We are dedicated to creating a diverse workplace where employees feel valued and accepted regardless of race, color, religion, national origin, gender, sexual orientation, age, disability, or veteran status. We have a dual-track performance management program, which includes both ongoing goal setting and annual performance reviews for all employees. Communication, teamwork, and collaboration are the fundamental attributes that are the foundation of our company culture. We promote the professional development of our employees by offering opportunities to participate in trainings and continuing education programs. We also offer a leading benefits package that includes extensive medical coverage, mental health and wellness services, paternal benefits, and financial resources. We earned our first certification as a Great Place to Work in 2019 and in 2023, 85% of our employees have said the Company is a great place to work as compared to 57% at a typical U.S. based company.

Our compensation program is designed to incentivize employees by offering competitive compensation comprised of fixed and variable pay including base salaries and cash bonuses. Many of our employees also receive equity awards that are subject to vesting over a multi-year period based on continued service. We believe these equity awards serve as an additional retention tool for our employees and align our employees with our shareholders. By cultivating a work culture that prioritizes our people through training, diversity, education, and volunteerism, we have been able to retain a long-tenured staff with 47% of current employees having a tenure of five years or more and an executive management team that has an average tenure of 20.9 years.

As of December 31, 2023, we employed 1,188 employees, 308 of whom were employed in our corporate offices. There are currently five collective bargaining agreements which cover the union workforce that services substantially all of our properties.

Climate Change

Our assessment of climate-related issues includes physical risks, transitions risks, and associated opportunities. We believe our sustained focus on Environmental, Social and Governance ("ESG") issues has led to effective risk-management practices that influence strategic decisions.

The Company takes a proactive approach to climate-related risk management throughout the organization. ESG considerations are embedded into our governance structure and management responsibilities, driving our climate-related risk assessment processes and enabling comprehensive risk mitigation responses to be implemented in all relevant business segments across short-term (0-3 years), medium-term (3-15 years), and long-term (15-27 years) time horizons.

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With our roots in New York City, we are at the center of one of the world's most ambitious climate legislative environments. Through the Climate Leadership and Community Protection Act signed into law in 2019, New York State mandated the adoption of a net-zero carbon economy statewide by 2050, with a zero-carbon electricity grid by 2040. New York City enacted Local Law 97 (LL97) in 2019 under the Climate Mobilization Act, setting carbon caps for large buildings starting in 2024 as part of a broader commitment to reducing greenhouse gas emissions by 40% by 2030, and by 80% by 2050. We do not anticipate any material financial impact on our portfolio in the first compliance period of 2024 to 2029.

The Company has demonstrated a commitment to transparency on climate issues via annual public reporting informed by widely-adopted frameworks, including Global Reporting Initiative ("GRI"), Global Real Estate Benchmark ("GRESB"), Sustainability Accounting Standards Board ("SASB"), and the CDP (formerly the Carbon Disclosure Project). In 2021, the Company released its first Task Force on Climate-related Financial Disclosures ("TCFD") report structured in accordance with the 11 TCFD recommendations covering its climate governance, strategy, management, and metrics. In 2023, the Company released its second TCFD report expanding on our list of physical and transition risks and opportunities and to present its progress on its TCFD disclosure. This report, along with the Company's current ESG Report, is available under "Reports & Resources" in the "Sustainability" section on our website. The Company has committed to near-term Scope 1 and Scope 2 science-based emissions reduction targets with the SBTi, which were approved in early 2023. Our goal is to reduce emissions for our operationally controlled portfolio to align it with the 1.5 degree Celsius climate scenario.

Highlights from 2023

Our significant achievements from 2023 included:

Leasing

•Signed 160 Manhattan office leases covering approximately 1.8 million square feet.

•Increased same-store Manhattan office occupancy sequentially in the third and fourth quarters.

•Signed an early lease renewal of 141,589 square feet and expansion by an additional 128,316 square feet with a premier financial services tenant at 280 Park Avenue.

•Signed an early lease renewal with CBS Broadcasting, Inc. for 184,367 square feet at 555 West 57th Street.

•Signed an early lease renewal of 41,851 square feet and expansion by 49,717 square feet with one of the world's largest sovereign wealth funds at 280 Park Avenue.

•Signed a new lease with Stonepeak Partners L.P. for 76,716 square feet at 245 Park Avenue.

•Signed a new lease with EQT Partners Inc. for 76,204 square feet at 245 Park Avenue.    

Acquisitions

•Following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest at 625 Madison Avenue to a 90.43% ownership interest. The fee interest is subject to a $223.0 million third-party mortgage, which matures in December 2026 and bears interest at a fixed rate of 6.05%.

Dispositions

•Together with our joint venture partner, the Company entered into an agreement to sell the fee ownership interest in 625 Madison Avenue for a gross sales price of $634.6 million. In connection with the sale, the Company, together with its joint venture partner, will originate a $235.5 million preferred equity investment in the property. The transaction is expected to close in the first quarter of 2024.

•Together with our joint venture partners, closed on the sale of the equity interests in the condominium units at 21 East 66th Street for total consideration of $40.6 million.

•Closed on the sale of a 49.9% joint venture interest in 245 Park Avenue for a gross asset valuation of $2.0 billion. The Company retained a 50.1% interest in the property.

•Together with our joint venture partner, closed on the sale of the retail condominiums at 121 Greene Street for a gross sales price of $14.0 million.

Finance

•Closed on a modification of the mortgage at 185 Broadway to extend the maturity to November 2026, as fully extended. The modification also converted the previous floating rate of 2.85% over Term SOFR to a fixed rate of 6.65% per annum through November 2025 and 2.55% over Term SOFR thereafter. The Company made a $20.0 million principal payment at closing resulting in an outstanding loan amount of $190.1 million as of December 31, 2023.

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•Together with our joint venture partner, closed on a modification of the mortgage at 719 Seventh Avenue to extend the maturity date to December 2024 with no change to the interest rate of 1.31% over Term SOFR.

•Together with our joint venture partner, closed on a modification of the mortgage at 115 Spring Street to extend the maturity date to March 2025. The modification also converted the floating rate of 3.40% over Term SOFR to a fixed rate of 5.50% for the term of the extension.

•Together with our joint venture partners, closed on a modification of the construction loan at One Madison Avenue, allowing the partnership to utilize the final tranche of the facility for an expanded range of uses, including additional amenities funded by construction cost savings and for hedging activities in contemplation of a permanent financing.

•Together with our joint venture partner, closed on the refinancing of 919 Third Avenue. The new $500.0 million mortgage replaces the previous $500.0 million mortgage, matures in April 2028, as fully extended, and bears interest at a floating rate of 2.50% over Term SOFR, which the partnership swapped to a fixed rate of 6.11%.

Debt and Preferred Equity Investments

•Closed on a $20.0 million upsize and three-year extension of a $39.1 million debt and preferred equity investment that was scheduled to mature in October 2023.

•Increased debt and preferred equity investments by $80.3 million, inclusive of advances under future funding obligations, discount and fee amortization, and paid-in-kind interest, net of premium amortization, and transferred investments with a carrying value of $349.9 million to equity ownership.

Construction in Progress

•The 1.4 million square foot tower at One Madison Avenue secured its temporary certificate of occupancy in September 2023, marking completion of the development three months ahead of schedule and significantly under budget. The milestone triggered cash payments to the Company totaling $577.4 million, representing the final equity payment from its joint venture partners. The cash was used to repay unsecured corporate debt.

•A temporary certificate of occupancy was issued by the New York City Buildings Department for the base building and the dormitory units at 15 Beekman. These units were turned over to Pace University, which has leased the property for a term of 30 years.

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ITEM 1A.    RISK FACTORS

Declines in the demand for office space in the New York metropolitan area, and in particular midtown Manhattan, could adversely affect the value of our real estate portfolio and our results of operations and, consequently, our ability to service current debt and to pay dividends and distributions to security holders.

A significant majority of our property holdings are comprised of commercial office properties located in midtown Manhattan. Our property holdings also include some retail properties. As a result of the concentration of our holdings, our business is dependent on the condition of the New York metropolitan area economy in general and the market for office space in midtown Manhattan in particular. Continued weakness and uncertainty in the New York metropolitan area economy could materially reduce the value of our real estate portfolio and our rental revenues, and thus adversely affect our cash flow and our ability to service our debt obligations and to pay dividends and distributions to security holders.

The COVID-19 pandemic caused severe disruptions with wide ranging impacts to virtually every segment of society and the global economy. Office companies in particular have been affected by the subsequent increased acceptance of flexible or hybrid work schedules, allowing employees to work remotely and collaborate through video or teleconferencing instead of in-office attendance. The continuation or expansion of remote work policies and flexible work arrangements may cause office tenants to reassess their long-term physical needs, which would have an adverse effect on our business, results of operations, liquidity, cash flows, prospects, and our ability to achieve forward-looking targets and expectations.

We may be unable to renew leases or relet space as leases expire.

If tenants decide not to renew their leases upon expiration, we may not be able to relet the space. Even if tenants do renew or we can relet the space, the terms of a renewal or new lease, taking into account among other things, the cost of improvements to the property and leasing commissions, may be less favorable than the terms in the expired leases. As of December 31, 2023, approximately 44.1% of the rentable square feet at our consolidated properties and approximately 20.6% of the rentable square feet at our unconsolidated joint venture properties are scheduled to expire by December 31, 2028. As of December 31, 2023, these leases had annualized escalated rent totaling $265.5 million and $384.0 million, respectively. In addition, changes in space utilization by tenants may cause us to incur substantial costs in renovating or redesigning the internal configuration of the relevant property in order to renew or relet space. If we are unable to promptly renew the leases or relet the space at similar rates or if we incur substantial costs in renewing or reletting the space, our cash flow and ability to service our debt obligations and pay dividends and distributions to security holders could be adversely affected.

We face significant competition for tenants.

The leasing of real estate is highly competitive. The principal competitive factors are rent, location, lease term, lease concessions, services provided and the nature and condition of the property to be leased. We directly compete with all owners, developers and operators of similar space in the areas in which our properties are located.

Our commercial office properties are concentrated in highly developed areas of the New York metropolitan area. Manhattan is the largest office market in the United States. The number of competitive office properties in the New York metropolitan area, which may be newer or better located than our properties, could have a material adverse effect on our ability to lease office space at our properties, and on the effective rents we are able to charge.

The expiration of long term leases or operating sublease interests where we do not own a fee interest in the land could adversely affect our results of operations.

Our interests in certain properties are entirely or partially comprised of either long-term leasehold or operating sublease interests in the land and the improvements, rather than by ownership of fee interest in the land. As of December 31, 2023, the expiration dates of these long-term leases range from 2043 to 2119, including the effect of our unilateral extension rights at each of these properties. Pursuant to the leasehold arrangements, we, as tenant under the long-term leasehold or the operating sublease, perform the functions traditionally performed by landlords with respect to our subtenants. We are responsible for not only collecting rent from our subtenants, but also maintaining the property and paying expenses relating to the property. Annualized cash rents, including our share of joint venture annualized cash rents, from properties held through long-term leases or operating sublease interests as of December 31, 2023 totaled $249.7 million, or 18.7%, of our share of total Portfolio annualized cash rent. Unless we purchase a fee interest in the underlying land or extend the terms of these leases prior to expiration, we will no longer operate these properties upon expiration of the leases, which could adversely affect our financial condition and results of operations. Rent payments under leasehold or operating sublease interests are adjusted, within the parameters of the contractual arrangements, at certain intervals. Rent adjustments may result in higher rents that could adversely affect our financial condition and results of operation.

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We rely on five large properties for a significant portion of our revenue.

Five of our properties, One Vanderbilt Avenue, 11 Madison Avenue, 420 Lexington Avenue, 1515 Broadway and 1185 Avenue of the Americas accounted for 38.9% of our Portfolio annualized cash rent, which includes our share of joint venture annualized cash rent, as of December 31, 2023.

Our revenue and cash available to service debt obligations and for distribution to our stockholders would be materially adversely affected if any of these properties were materially damaged or destroyed. Additionally, our revenue and cash available to service debt obligations and for distribution to our stockholders would be materially adversely affected if tenants at these properties fail to timely make rental payments due to adverse financial conditions or otherwise, default under their leases or file for bankruptcy or become insolvent.

Our results of operations rely on major tenants and insolvency or bankruptcy of these or other tenants could adversely affect our results of operations.

Giving effect to leases in effect as of December 31, 2023 for consolidated properties and unconsolidated joint venture properties, as of that date, our five largest tenants, based on annualized cash rent, accounted for 15.4% of our share of Portfolio annualized cash rent, with one tenant, Paramount Global (formerly ViacomCBS Inc.), accounting for 5.9% of our share of Portfolio annualized cash rent. Our business and results of operations would be adversely affected if any of our major tenants became insolvent, declared bankruptcy, or otherwise refused to pay rent in a timely fashion or at all. In addition, if business conditions in the industries in which our tenants are concentrated deteriorate, or economic volatility has a disproportionate impact on our tenants, we may experience increases in past due accounts, defaults, lower occupancy and reduced effective rents across tenants in such industries, which could in turn have an adverse effect on our business and results of operations.

Construction is in progress at our development projects.

The Company's development projects are subject to internal and external factors which may affect construction progress. Unforeseen matters could delay completion, result in increased costs or otherwise have a material effect on our results of operations. In addition, the extended time frame to complete these projects could cause them to be subject to shifts and trends in the real estate market which may not be consistent with our current business plans for the properties.

We are subject to risks that affect the retail environment.

While only 4.7% of our Portfolio annualized cash rent was generated by retail properties as of December 31, 2023, principally in Manhattan, we are subject to risks that affect the retail environment generally, including the level of consumer spending and preferences, consumer confidence, electronic retail competition and levels of tourism in Manhattan. These factors could adversely affect the financial condition of our retail tenants and the willingness of retailers to lease space in our retail properties, which could in turn have an adverse effect on our business and results of operations.

We are subject to the risk of adverse changes in economic and geopolitical conditions in general and the commercial office markets in particular.

Our business has been and may continue to be affected by the ongoing volatility in the U.S. financial and credit markets and higher interest rate environments and other market, economic, or political challenges experienced by the U.S. economy or the real estate industry as a whole, including changes in law and policy and uncertainty in connection with any such changes. Periods of economic weakness or volatility result in reduced access to credit and/or wider credit spreads. Economic or political uncertainty, including concern about growth and the stability of the markets generally and changes in interest rates, have led lenders and institutional investors to reduce and, in some cases, cease to provide funding to borrowers, which adversely affects our liquidity and financial condition, and the liquidity and financial condition of our tenants. Specifically, our business, like other real estate businesses, has been and may continue to be affected by the following conditions:

•significant job losses or declining rates of job creation, which decrease demand for office space, causing market rental rates and property values to be negatively impacted;

•the ability to borrow on terms and conditions that we find acceptable, which reduces our ability to pursue acquisition and development opportunities and refinance existing debt, reducing our returns from both our existing operations and our acquisition and development activities and increasing our future interest expense; and

•reduced values of our properties, which limits our ability to dispose of assets at acceptable prices and to obtain debt financing secured by our properties.

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Leasing office space to smaller and growth-oriented businesses could adversely affect our cash flow and results of operations.

Some of the tenants in our properties are smaller, growth-oriented businesses that may not have the financial strength of larger corporate tenants. Smaller companies generally experience a higher rate of failure than larger businesses. Growth-oriented firms may also seek other office space as they develop. Leasing office space to these companies creates a higher risk of tenant defaults, turnover and bankruptcies, which could adversely affect our cash flow and results of operations.

We may suffer adverse consequences if our revenues decline since our operating costs do not decline in proportion to our revenue.

We earn a significant portion of our income from renting our properties. Our operating costs, however, do not fluctuate in proportion to changes in our rental revenue. If revenues decline more than expenses, we may be forced to borrow to cover our costs, we may incur losses or we may not have cash available to service our debt obligations and to pay dividends and distributions to security holders.

Competition for acquisitions may reduce the number of acquisition opportunities available to us and increase the costs of those acquisitions.

We may acquire properties when we are presented with attractive opportunities. We may face competition for acquisition opportunities from other investors, particularly those investors who are willing to incur more leverage, and this competition may adversely affect us by subjecting us to the following risks:

•an inability to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and privately held REITs, private real estate funds, domestic and foreign financial institutions, life insurance companies, sovereign wealth funds, pension trusts, partnerships and individual investors; and

•an increase in the purchase price for such acquisition property.

If we are unable to successfully acquire additional properties, our ability to grow our business could be adversely affected.

We face risks associated with property acquisitions.

Our acquisition activities may not be successful if we are unable to meet required closing conditions or unable to finance acquisitions and developments of properties on favorable terms or at all. Additionally, we have less visibility into the future performance of acquired properties than properties that we have owned for a period of time, and therefore, recently acquired properties may not be as profitable as our existing portfolio.

Further, we may acquire properties subject to both known and unknown liabilities and without any recourse, or with only limited recourse to the seller. As a result, if a liability were asserted against us arising from our ownership of those properties, we might have to pay substantial sums to settle it, which could adversely affect our cash flow. Unknown liabilities with respect to properties acquired might include:

•claims by tenants, vendors or other persons arising from dealing with the former owners of the properties;

•liabilities incurred in the ordinary course of business;

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

•liabilities for clean-up of undisclosed environmental contamination.

Limitations on our ability to sell or reduce the indebtedness on specific properties could adversely affect the value of our common stock.

In connection with past and future acquisitions of interests in properties, we have or may agree to restrictions on our ability to sell or refinance the acquired properties for certain periods. These limitations could result in us holding properties which we would otherwise sell, or prevent us from paying down or refinancing existing indebtedness, any of which may have adverse consequences on our business and result in a material adverse effect on our financial condition and results of operations.

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Potential losses may not be covered by insurance.

We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR")) within two property insurance programs and liability insurance. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. There is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned, in whole or in part, by the Company or its affiliates.

Furthermore, with respect to certain of our properties, including certain properties held by joint ventures or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss.

The occurrence of a terrorist attack may adversely affect the value of our properties and our ability to generate cash flow.

Our operations are primarily concentrated in the New York metropolitan area. In the aftermath of a terrorist attack or other acts of terrorism or war, tenants in the New York metropolitan area may choose to relocate their business to less populated, lower-profile areas of the United States that those tenants believe are not as likely to be targets of future terrorist activity. In addition, economic activity could decline as a result of terrorist attacks or other acts of terrorism or war, or the perceived threat of such acts. Each of these impacts could in turn trigger a decrease in the demand for space in the New York metropolitan area, which could increase vacancies in our properties and force us to lease our properties on less favorable terms. While under the Terrorism Risk Insurance Program Reauthorization Act of 2019, insurers must make terrorism insurance available under their property and casualty insurance policies, this legislation does not regulate the pricing of such insurance. The absence of affordable terrorism insurance coverage may adversely affect the general real estate lending market, lending volume and the market's overall liquidity and, in the event of an uninsured loss, we could lose all or a portion of our assets. Furthermore, we may also experience increased costs in relation to security equipment and personnel. As a result, the value of our properties and our results of operations could materially decline.

We face possible risks associated with the natural disasters and the effects of climate change.

We are committed to enhancing the resilience of our properties and we have established comprehensive procedures to effectively manage and respond to climate-related risks. Our procedures encompass a range of potential impacts, including those stemming from natural disasters such as storms, heatwaves, hurricanes, flooding, and other severe weather. We recognize that the intensity of weather events and the rise in sea levels have the potential to impact our properties, operations, and overall business. Since Hurricane Sandy in 2012, New York City has experienced several severe storms that have had significant impacts on the area, and we are actively tracking the risks these storms pose to the city’s real estate market and physical landscape. Over time, and in an extreme scenario, these conditions could potentially result in declining demand for office space, specifically in coastal areas of New York City, or potentially an inability to fully operate buildings. Climate change may also have indirect effects on our business by increasing the cost of property insurance on terms we find acceptable or causing a lack of availability of sufficient insurance. There could also be increases in the cost of energy and other natural resources at our properties as we seek to repair and protect our properties against climate risks. We proactively review every building through both a financial and environmental lens to ensure that building systems and operations align with our climate-related risk assessments. Any of these direct or indirect effects of climate change may have a material adverse effect on our properties, operations or business.

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We may incur significant costs to comply with climate change initiatives, and in particular those implemented in New York City.

Numerous states and municipalities have adopted laws and policies on climate change and emission reduction targets. In particular, through the Climate Leadership and Community Protection Act signed into law in 2019, New York State mandated the adoption of a net-zero carbon economy statewide by 2050, with a zero-carbon electricity grid by 2040. New York City enacted Local Law 97 (LL97) in 2019 under the Climate Mobilization Act, setting carbon caps for large buildings starting in 2024 as part of a broader commitment to reducing greenhouse gas emissions by 40% by 2030, and by 80% by 2050. As our portfolio is principally located in Manhattan, our business is subject to transition risks related to these climate change policies. Costs of compliance or penalties in later compliance periods may be significant. If we are unable to meet the required emissions reductions, we may be subject to material fines that will continue to be assessed each year we fail to comply. Based on current emissions data available from 2022, our portfolio is expected to be compliant through 2024, with no material financial impact to our properties. Additionally, even if we can achieve compliance under LL97 in a given year, it is not a certainty that we will remain in compliance in subsequent years.

RISKS RELATED TO OUR LIQUIDITY AND CAPITAL RESOURCES

Debt financing, financial covenants, degree of leverage, and increases in interest rates could adversely affect our economic performance.

Scheduled debt payments could adversely affect our results of operations.

Cash flow could be insufficient to meet the payments of principal and interest required under our current mortgages, our 2021 credit facility, our senior unsecured notes, our debentures and indebtedness outstanding at our joint venture properties. The total principal amount of our outstanding consolidated indebtedness was $3.5 billion as of December 31, 2023, consisting of $1.3 billion in unsecured bank term loans, $0.1 billion under our senior unsecured notes, $0.1 billion of junior subordinated deferrable interest debentures, $1.5 billion of non-recourse mortgages and loans payable on certain of our properties and debt and preferred equity investments and $560.0 million drawn under our revolving credit facility. In addition, we could increase the amount of our outstanding consolidated indebtedness in the future, in part by borrowing under the revolving credit facility. As of December 31, 2023, the total principal amount of indebtedness outstanding at the joint venture properties was $14.9 billion, of which our proportionate share was $7.4 billion.

If we are unable to make payments under our 2021 credit facility, all amounts due and owing at such time shall accrue interest at a per annum rate equal to 2% higher than the rate applicable immediately prior to the default. If we are unable to make payments under our senior unsecured notes, the principal and unpaid interest will become immediately payable. If a property is mortgaged to secure payment of indebtedness and we are unable to meet mortgage payments, the mortgagee could foreclose on the property, resulting in loss of income and asset value. Foreclosure on mortgaged properties or an inability to make payments under our 2021 credit facility or our senior unsecured notes could trigger defaults under the terms of our other financings, making such financings at risk of being declared immediately payable, and would have a negative impact on our financial condition and results of operations.

We may not be able to refinance existing indebtedness, which may require substantial principal payments at maturity. $382.8 million of consolidated mortgage debt and $1.6 billion of unconsolidated joint venture debt is scheduled to mature in 2024 after giving effect to our as-of-right extension options and repayments and refinancing of consolidated and joint venture debt between December 31, 2023 and February 22, 2024 as discussed in the "Financial Statements and Supplementary Data" section. At the present time, we intend to repay, refinance, or exercise extension options on the debt associated with our properties on or prior to their respective maturity dates. At the time of refinancing, prevailing interest rates or other factors, such as the possible reluctance of lenders to make commercial real estate loans, may result in higher interest rates. Increased interest expense on the extended or refinanced debt would adversely affect cash flow and our ability to service debt obligations and pay dividends and distributions to security holders. If any principal payments due at maturity cannot be repaid, refinanced or extended, our cash flow will not be sufficient to repay maturing or accelerated debt.

Financial covenants could adversely affect our ability to conduct our business.

The mortgages and mezzanine loans on our properties generally contain customary negative covenants that limit our ability to further mortgage the properties, to enter into material leases without lender consent or materially modify existing leases, among other things. In addition, our 2021 credit facility and senior unsecured notes contain restrictions and requirements on our method of operations. Our 2021 credit facility and our unsecured notes also require us to maintain designated ratios, including but not limited to, total debt-to-assets, debt service coverage and unencumbered assets-to-unsecured debt. These restrictions could adversely affect operations (including reducing our flexibility and our ability to incur additional debt), our ability to pay debt obligations and our ability to pay dividends and distributions to security holders.

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High interest rates could adversely affect our cash flow.

Advances under our 2021 credit facility and certain property-level mortgage debt bear interest at a variable rate. After giving effect to derivatives, our consolidated variable rate borrowings totaled $0.3 billion as of December 31, 2023. In addition, we could increase the amount of our outstanding variable rate debt in the future, in part by borrowing additional amounts under our 2021 credit facility. Borrowings under our revolving credit facility and two term loans bore interest at the adjusted term Secured Overnight Financing Rate ("SOFR") plus 10 basis points, and the applicable spreads of 140 basis points, 160 basis points, and 165 basis points, respectively, as of December 31, 2023. As of December 31, 2023, borrowings under our term loans and junior subordinated deferrable interest debentures totaled $1.3 billion and $100.0 million, respectively. We may incur indebtedness in the future that also bears interest at a variable rate or may be required to refinance our debt at higher rates. If we were to incur variable rate indebtedness in the future, we may seek to enter into derivative instruments to mitigate the effect of such variable rate debt. However, such derivative instruments may not be available on favorable terms or at all. As of December 31, 2023, a hypothetical 100 basis point increase in interest rates across each of our variable interest rate instruments, including our variable rate debt and preferred equity investments which mitigate our exposure to interest rate changes, would increase our net annual interest costs by $1.0 million and would increase our share of joint venture annual interest costs by $12.2 million. Our joint ventures may also incur variable rate debt and face similar risks. Accordingly, increases in interest rates could adversely affect our results of operations and financial conditions and our ability to continue to pay dividends and distributions to security holders.

In addition, borrowings under our existing term loan and revolving credit facilities bear interest at a rate based on the term SOFR, which is a relatively new reference rate that replaced U.S. dollar London Interbank Offered Rate ("LIBOR"). As a result of SOFR’s limited performance history, the future performance of SOFR cannot be reliably predicted. The level of SOFR during the term of our existing term loan and revolving credit facilities may bear little or no relation to the historical level of SOFR. The future performance of SOFR is impossible to reliably predict, and, therefore, no future performance under our existing term loan and revolving credit facilities as it relates to SOFR may be inferred from historical performance. Since the initial publication of SOFR, daily changes in SOFR have, on occasion, been more volatile than daily changes in comparable benchmark or market rates, and SOFR over the term of our existing term loan and revolving credit facilities may bear little or no relation to the historical actual or historical indicative data. Changes in the levels of SOFR will affect the amount of interest we pay on our existing credit facilities. Additionally, there can be no assurance that SOFR will gain long-term market acceptance. Market participants may not consider SOFR to be a suitable substitute or successor for all of the purposes for which U.S. dollar LIBOR historically has been used (including, without limitation, as a representation of the unsecured short-term funding costs of banks), which may, in turn, lessen market acceptance of SOFR and cause SOFR to be modified or discontinued. These consequences could adversely affect our financial results or the amount of interest we pay on our existing credit facilities.

Our hedging strategies may not effectively limit exposure against interest rate changes, which may adversely affect results of operations.

The interest rate hedge instruments we use to manage some of our exposure to interest rate volatility involve risk and counterparties may fail to perform under these arrangements. In addition, these arrangements may not be effective in reducing our exposure to interest rate changes. When existing interest rate hedges terminate, we may incur increased costs in putting in place further interest rate hedges. Failure to hedge effectively against interest rate changes may adversely affect our results of operations.

Increases in our leverage could adversely affect our stock price.

Our organizational documents do not contain any limitation on the amount of indebtedness we may incur. We consider many factors when making decisions regarding the incurrence of indebtedness, such as the purchase price of properties to be acquired with debt financing, the estimated market value of our properties and the ability of particular properties and our business as a whole to generate cash flow to cover expected debt service. Any changes that increase our leverage could be viewed negatively by investors and could have a material effect on our financial condition, results of operations, cash flows, the trading price of our securities and our ability to pay dividends and distributions to security holders.

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Debt and preferred equity investments could cause us to incur expenses, which could adversely affect our results of operations.

We held first mortgages, mezzanine loans, junior participations and preferred equity interests with an aggregate net book value of $346.7 million as of December 31, 2023. Some of these instruments may have some recourse to their sponsors, while others are limited to the collateral securing the loan. In the event of a default under these obligations, we may take possession of the collateral securing these interests. Borrowers may contest enforcement of foreclosure or other remedies, seek bankruptcy protection against such enforcement and/or bring claims for lender liability in response to actions to enforce their obligations to us. Declines in the value of the property may prevent us from realizing an amount equal to our investment upon foreclosure or realization even if we make substantial improvements or repairs to the underlying real estate in order to maximize such property's investment potential. In addition, we may invest in mortgage-backed securities and other marketable securities.

Our debt and preferred equity investments are carried at the net amounts expected to be collected. We maintain and regularly evaluate the need for reserves to protect against potential future credit losses. Our reserves reflect management's judgment of the probability and severity of losses and the value of the underlying collateral. We cannot be certain that our judgment will prove to be correct and that our reserves will be adequate over time to protect against future credit losses because of unanticipated adverse changes in the economy or events adversely affecting specific properties, assets, tenants, borrowers, industries in which our tenants and borrowers operate or markets in which our tenants and borrowers or their properties are located. The ultimate resolutions may differ from our expectation, and we could suffer losses which would have a material adverse effect on our financial performance, the trading price of our securities and our ability to pay dividends and distributions to security holders.

Joint investments could be adversely affected by our lack of sole decision-making authority and reliance upon a co-venturer's financial condition.

We co-invest with third parties through partnerships, joint ventures, co-tenancies or other structures, and by acquiring non-controlling interests in, or sharing responsibility for managing the affairs of, a property, partnership, joint venture, co-tenancy or other entity. Therefore, we may not be in a position to exercise sole decision-making authority regarding such property, partnership, joint venture or other entity. Investments in partnerships, joint ventures, or other entities may involve risks not present were a third party not involved, including the possibility that our partners, co-tenants or co-venturers might file for bankruptcy protection or otherwise fail to fund their share of required capital contributions. Additionally, our partners or co-venturers might at any time have economic or other business interests or goals which are competitive or inconsistent with our business interests or goals. These investments may also have the potential risk of impasses on decisions such as a sale, because neither we, nor the partner, co-tenant or co-venturer would have full control over the partnership or joint venture. In addition, we may in specific circumstances be liable for the actions of our third-party partners, co-tenants or co-venturers. As of December 31, 2023, we had an aggregate carrying value in joint ventures totaling $3.0 billion.

Certain of our joint venture agreements contain terms in favor of our partners that could have an adverse effect on the value of our investments in the joint ventures.

Each of our joint venture agreements has been individually negotiated with our partner in the joint venture and, in some cases, we have agreed to terms that are more favorable to our partner in the joint venture than to us. For example, our partner may be entitled to a specified portion of the profits of the joint venture before we are entitled to any portion of such profits. We may also enter into similar arrangements in the future.

We are dependent on external sources of capital.

We need a substantial amount of capital to operate and grow our business. This need is exacerbated by the distribution requirements imposed on us for SL Green to qualify as a REIT. We therefore rely on third-party sources of capital, which may not be available on favorable terms or at all. Our access to third-party sources of capital depends on a number of things, including the market's perception of our growth potential and our current and potential future earnings. In addition, we may raise money in the public equity and debt markets and our ability to do so will depend upon the general conditions prevailing in these markets. At any time, conditions may exist which effectively prevent us, or REITs in general, from accessing these markets. Moreover, additional equity offerings may result in substantial dilution of our stockholders' interests, and additional debt financing may substantially increase our leverage.

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RISKS RELATED TO OUR ORGANIZATION AND STRUCTURE

We depend on dividends and distributions from our direct and indirect subsidiaries.

Substantially all of our assets are held through subsidiaries of our Operating Partnership. We are, therefore, dependent on the results of operations of our subsidiaries and their ability to provide us with cash, whether in the form of dividends paid through our Operating Partnership, loans or otherwise, to meet our obligations and to pay any dividends to our equity holders. Any distributions to us from those subsidiaries may be subject to contractual and other restrictions, including such subsidiaries' obligations to their creditors, and could be subject to other business and operational considerations. Additionally, our Operating Partnership's ability to distribute to us any cash that it receives from our subsidiaries will also depend on its ability to first satisfy its obligations to its creditors and make distributions payable to holders of its outstanding preferred units and any additional preferred units it may issue from time to time.

In addition, our participation in any distribution of the assets of any of our direct or indirect subsidiaries upon any liquidation, reorganization or insolvency is only after the claims of the creditors, including trade creditors and preferred security holders, are satisfied.

Our charter documents, debt instruments and applicable law may hinder any attempt to acquire us, which could discourage takeover attempts and prevent our stockholders from receiving a premium over the market price of our stock.

Provisions of our charter and bylaws could inhibit changes in control.

A change of control of our company could benefit stockholders by providing them with a premium over the then-prevailing market price of our stock. However, provisions contained in our charter and bylaws may delay or prevent a change in control of our company. These provisions, discussed more fully below, are:

•Ownership limitations;

•Maryland takeover statutes that may prevent a change of control of our company; and

•Contractual provisions that limit the assumption of certain of our debt.

We have a stock ownership limit.

To remain qualified as a REIT for federal income tax purposes, not more than 50% in value of our outstanding capital stock may be owned by five or fewer individuals at any time during the last half of any taxable year. For this purpose, stock may be "owned" directly, as well as indirectly under certain constructive ownership rules, including, for example, rules that attribute stock held by one shareholder to another shareholder. In part to avoid violating this rule regarding stock ownership limitations and maintain our REIT qualification, our charter prohibits direct or indirect ownership by any single stockholder of more than 9.0% in value or number of shares of our common stock. Limitations on the ownership of preferred stock may also be imposed by us.

Our board of directors has the discretion to raise or waive this limitation on ownership for any stockholder if deemed to be in our best interest. Our board of directors has granted such waivers from time to time. To obtain a waiver, a stockholder must present the board and our tax counsel with evidence that ownership in excess of this limit will not affect our present or future REIT status.

Absent any exemption or waiver, stock acquired or held in excess of the limit on ownership will be transferred to a trust for the exclusive benefit of a designated charitable beneficiary, and the stockholder's rights to distributions and to vote would terminate. The stockholder would be entitled to receive, from the proceeds of any subsequent sale of the shares transferred to the charitable trust, the lesser of: the price paid for the stock or, if the owner did not pay for the stock, the market price of the stock on the date of the event causing the stock to be transferred to the charitable trust; and the amount realized from the sale.

This limitation on ownership of stock could delay or prevent a change in control of our company.

Maryland takeover statutes may prevent a change of control of our company, which could depress our stock price.

Under the Maryland General Corporation Law, or the MGCL, "business combinations" between a Maryland corporation and an interested stockholder or an affiliate of an interested stockholder are prohibited for five years after the most recent date on which the interested stockholder becomes an interested stockholder. These business combinations include a merger, consolidation, share exchange or, in circumstances specified in the statute, an asset transfer or issuance or reclassification of equity securities. An interested stockholder is defined as:

•any person who beneficially owns 10% or more of the voting power of the corporation's outstanding voting stock; or

•an affiliate or associate of the corporation who, at any time within the two year period prior to the date in question, was the beneficial owner of 10% or more of the voting power of the then outstanding voting stock of the corporation.

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A person is not an interested stockholder under the statute if the board of directors approves in advance the transaction by which he otherwise would have become an interested stockholder.

After the five year prohibition, any business combination between the Maryland corporation and an interested stockholder generally must be recommended by the board of directors of the corporation and approved by the affirmative vote of at least:

•80% of the votes entitled to be cast by holders of outstanding shares of voting stock of the corporation, voting together as a single group; and

•two-thirds of the votes entitled to be cast by holders of voting stock of the corporation other than shares held by the interested stockholder with whom or with whose affiliate the business combination is to be effected or held by an affiliate or associate of the interested stockholder.

The business combination statute may discourage others from trying to acquire control of us and increase the difficulty of consummating any offer, including potential acquisitions that might involve a premium price for our common stock or otherwise be in the best interest of our stockholders.

In addition, the MGCL provides that holders of "control shares" of a Maryland corporation acquired in a "control share acquisition" will not have voting rights with respect to the control shares except to the extent approved by a vote of two-thirds of the votes entitled to be cast on the matter, excluding shares of stock owned by the acquiror, by officers of the corporation or by directors who are employees of the corporation. "Control shares" means voting shares of stock that, if aggregated with all other shares of stock owned by the acquiror or in respect of which the acquiror is able to exercise or direct the exercise of voting power (except solely by virtue of a revocable proxy), would entitle the acquiror to exercise voting power in electing directors within one of the following ranges of voting power: (i) one-tenth or more but less than one-third; (ii) one-third or more but less than a majority; or (iii) a majority or more of all voting power. A "control share acquisition" means the acquisition of ownership of, or the power to direct the exercise of voting power with respect to, issued and outstanding control shares, subject to certain exceptions.

We have opted out of the "business combinations" and "control shares" provisions of the MGCL by resolution of our board of directors and a provision in our bylaws, respectively. However, in the future, our board of directors may reverse its decision by resolution and elect to opt in to the MGCL's business combination provisions, or amend our bylaws and elect to opt in to the MGCL's control share provisions.

Additionally, other provisions of the MGCL permit our board of directors, without stockholder approval and regardless of what is provided in our charter or bylaws, to implement certain other takeover defenses, some of which have been implemented through provisions in our charter or bylaws unrelated to the provisions of the MGCL. Such takeover defenses, to the extent implemented now or in the future, may have the effect of inhibiting a third party from making us an acquisition proposal or of delaying, deferring or preventing a change in our control under circumstances that otherwise could provide our stockholders with an opportunity to realize a premium over the then-current market price.

Contractual provisions that limit the assumption of certain of our debt may prevent a change in control.

Certain of our consolidated debt is not assumable and may be subject to significant prepayment penalties. These limitations could deter a change in control of our company.

SL Green's failure to qualify as a REIT would be costly and would have a significant effect on the value of our securities.

We believe we have operated in a manner for SL Green to qualify as a REIT for federal income tax purposes and intend to continue to so operate. Many of the REIT compliance requirements, however, are highly technical and complex. The determination that SL Green is a REIT requires an analysis of factual matters and circumstances. These matters, some of which are not totally within our control, can affect SL Green's qualification as a REIT. For example, to qualify as a REIT, at least 95% of our gross income must come from designated sources that are listed in the applicable tax laws. We are also required to distribute to stockholders at least 90% of our REIT taxable income excluding capital gains. The fact that we hold our assets through the Operating Partnership and its subsidiaries further complicates the application of the REIT requirements. Even a technical or inadvertent mistake could jeopardize our REIT status. Furthermore, Congress and the Internal Revenue Service, or the IRS, might make changes to the tax laws and regulations that make it more difficult, or impossible, for us to remain qualified as a REIT.

If SL Green fails to qualify as a REIT, the funds available for distribution to our stockholders would be substantially reduced as we would not be allowed a deduction for dividends paid to our stockholders in computing our taxable income and would be subject to federal income tax at regular corporate rates and possibly increased state and local taxes.

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Also, unless the IRS grants us relief under specific statutory provisions, SL Green would remain disqualified as a REIT for four years following the year in which SL Green first failed to qualify. If SL Green failed to qualify as a REIT, SL Green would have to pay significant income taxes and would therefore have less money available for investments, to service debt obligations or to pay dividends and distributions to security holders. This would have a significant adverse effect on the value of our securities. In addition, the REIT tax laws would no longer obligate us to make any distributions to stockholders. As a result of all these factors, if SL Green fails to qualify as a REIT, this could impair our ability to expand our business and raise capital.

We may in the future pay taxable dividends on our common stock in common stock and cash.

In order to qualify as a REIT, we are required to annually distribute to our stockholders at least 90% of our REIT taxable income, excluding net capital gains. In order to avoid taxation of our income, we are required to annually distribute to our stockholders all of our taxable income, including net capital gains. In order to satisfy these requirements, we have, and in the future may make distributions that are payable partly in cash and partly in shares of our common stock. If we pay such a dividend, taxable stockholders would be required to include the entire amount of the dividend, including the portion paid with shares of common stock, as income to the extent of our current and accumulated earnings and profits, and may be required to pay income taxes with respect to such dividends in excess of the cash dividends received.

RISKS RELATED TO LEGAL AND REGULATORY MATTERS

We may incur costs to comply with governmental laws and regulations.

We are subject to various federal, state and local environmental and health and safety laws that can impose liability on current and former property owners or operators for the clean-up of certain hazardous substances released on a property or of contamination at any facility (e.g., a landfill) to which we have sent hazardous substances for treatment or disposal, without regard to fault or whether the release or disposal was in compliance with law. Being held responsible for such a clean-up could result in significant cost to us and have a material adverse effect on our financial condition and results of operations.

Our properties may be subject to risks relating to current or future laws, including laws benefiting disabled persons, such as the Americans with Disabilities Act, or ADA, and state or local zoning, construction or other regulations. Compliance with such laws may require significant property modifications in the future, which could be costly. Non-compliance could result in fines being levied against us in the future.

Compliance with changing or new regulations applicable to corporate governance and public disclosure may result in additional expenses, or affect our operations.

Changing or new laws, regulations and standards relating to corporate governance and public disclosure, including SEC regulations and NYSE rules, can create uncertainty for public companies. These changed or new laws, regulations and standards are subject to varying interpretations in many cases due to their lack of specificity. As a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies, which could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices. We are committed to maintaining high standards of corporate governance and public disclosure. If our efforts to comply with new or changed laws, regulations and standards differ from the activities intended by regulatory or governing bodies due to ambiguities related to practice, our reputation may be harmed.

Our efforts to comply with evolving laws, regulations and standards have resulted in, and are likely to continue to result in, increased general and administrative expenses and a diversion of management time and attention from revenue-generating activities to compliance activities. In particular, our continued efforts to comply with Section 404 of the Sarbanes-Oxley Act of 2002 and the related regulations regarding our required assessment of our internal controls over financial reporting and our external auditors' audit of that assessment have required the commitment of significant financial and managerial resources. We expect these efforts to require the continued commitment of significant resources. Further, our directors, chief executive officer and chief financial officer could face an increased risk of personal liability in connection with the performance of their duties. As a result, we may have difficulty attracting and retaining qualified directors and executive officers, which could harm our business.

Our property taxes could increase due to reassessment or property tax rate changes.

We are required to pay real property taxes or payments in lieu of taxes in respect of our properties and such taxes may increase as our properties are reassessed by taxing authorities or as property tax rates change. An increase in the assessed value of our properties or our property tax rates could adversely impact our financial condition, results of operations and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

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GENERAL RISK FACTORS

The trading price of our common stock has been and may continue to be subject to wide fluctuations.

Between January 1, 2023 and December 31, 2023, the closing sale price of our common stock on the New York Stock Exchange, or the NYSE, ranged from $19.96 to $48.00 per share. Our stock price may fluctuate in response to a number of events and factors, such as those described elsewhere in this "Risk Factors" section. Equity issuances or buybacks by us or the perception that such issuances or buybacks may occur may also affect the market price of our common stock.

Future issuances of common stock, preferred stock or convertible debt could dilute existing stockholders' interests.

Our charter authorizes our Board of Directors to issue additional shares of common stock, preferred stock and convertible equity or debt without stockholder approval and without the requirement to offer rights of pre-emption to existing stockholders. Any such issuance could dilute our existing stockholders' interests. Also, any future series of preferred stock may have voting provisions that could delay or prevent a change of control of our company.

Changes in market conditions could adversely affect the market price of our common stock.

As with other publicly traded equity securities, the value of our common stock depends on various market conditions, which may change from time to time. In addition to the current economic environment and future volatility in the securities and credit markets, the following market conditions may affect the value of our common stock:

•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 financial performance; and

•general stock and bond market conditions.

The market value of our common stock is based on a number of factors including, but not limited to, the market's perception of the current and future value of our assets, our growth potential and our current and potential future earnings and cash dividends. Consequently, our common stock may trade at prices that are higher or lower than our net asset value per share of common stock.

Changes to U.S. federal income tax laws could materially and adversely affect us and our stockholders.

U.S. federal income tax laws and the rules dealing with U.S. federal income taxation are continually under review by Congress, the IRS, and the U.S. Department of the Treasury. Any such changes could have an adverse effect on an investment in our shares or on the market value or the resale potential of our assets.

Loss of key personnel could harm our operations and our stock price.

We are dependent on the efforts of Marc Holliday, our chairman, chief executive officer and interim president. Mr. Holliday has an employment agreement which expires in January 2025. A loss of Mr. Holliday's services could adversely affect our operations and could be negatively perceived by the market resulting in a decrease in our stock price.

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Our business and operations would suffer in the event of system failures or cyber security attacks.

Despite system redundancy, the implementation of security measures and the preparation of a disaster data recovery plan, our internal information technology (“IT”) networks and third-party systems on which we rely are vulnerable to a number of risks including energy blackouts, natural disasters, terrorism, war, telecommunication failures and cyber attacks and intrusions, such as phishing attacks, ransomware, data breaches and unauthorized access, including from persons inside our organization or from persons outside our organization with access to our systems. The risk of a security breach or disruption, particularly through cyber attacks and intrusions, including by 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. Like other businesses, we have experienced cyber incidents in the past, which were not individually, or in the aggregate, material, and we may be subject to cyber attacks in the future. Our systems are critical to the operation of our business, as well as certain of our tenants, and a system failure, accident or security breach could result in a material disruption to our business and operations. We have and may also incur additional costs to remedy damages caused by such disruptions. Although we make efforts to maintain the security and integrity of our systems and have implemented various measures designed 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. Any compromise of our security could also result in a violation of applicable privacy and other laws, significant legal and financial exposure, damage to our reputation and relationships with tenants and vendors, loss or misappropriation of data (which may be confidential, proprietary and/or commercially sensitive in nature) and a loss of confidence in our security measures, which could harm our business.

Forward-looking statements may prove inaccurate.

See Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations—Forward-looking Information," for additional disclosure regarding forward-looking statements.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

As of December 31, 2023, we did not have any unresolved comments with the staff of the SEC.

ITEM 1C.    CYBERSECURITY

Risk Management and Strategy

The Company's business and proprietary information, information technology and operational technology assets are important to its success. The Company’s cybersecurity program is designed to protect its information assets and operations from external and internal cyber threats by seeking to mitigate and manage risks while helping to ensure business resiliency. The program is applied across all levels of the Company.

The Company takes a risk-based approach to cybersecurity and has implemented policies that are designed to address cybersecurity threats and incidents, including those related to third-party service providers. The Company assesses risks from cybersecurity threats, monitors its information systems for potential vulnerabilities and tests those systems pursuant to the Company's cybersecurity standards, processes and practices, as part of the Company's overall risk management system. The Company also leverages external resources and advisors as needed to reinforce its cybersecurity capacity. External consultants perform testing exercises to further assess the Company’s cybersecurity program on an annual basis, or more frequently if circumstances warrant such testing.

The Company’s cybersecurity strategy is guided by prioritized risk, the National Institute for Standards and Technology (NIST) Cybersecurity Framework, and emerging business needs. The Company maintains a cybersecurity incident response plan, as well as a monitoring program, to support senior leadership and the Board.

The Company’s cybersecurity team manages its incident response plan and monitoring program. Company employees are provided cybersecurity awareness training, which includes topics on the Company’s policies and procedures for reporting potential incidents. The Company’s cybersecurity team is focused on evaluating emerging risks, regulations, and compliance matters and updating the policies and procedures accordingly.

To date, cybersecurity risks, including as a result of any previous cybersecurity incidents, have not materially affected and we believe are not reasonably likely to affect the Company, including its business strategy, results of operations or financial condition. Refer to the risk factor captioned “Our business and operations would suffer in the event of system failures or cyber security attacks” in Part I, Item 1A. “Risk Factors” for additional description of cybersecurity risks and potential related impacts on the Company.

Governance

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The Board oversees the Company’s risk management process directly and through its committees. Pursuant to the Audit Committee Charter, the Audit Committee of the Board provides compliance oversight to the Company’s risk assessment and risk management policies and the steps management has taken to monitor and mitigate such exposures and risks.

The Company’s Senior Director, Information Security & Network Systems, in coordination with the Senior Vice President, Information Technology, is responsible for leading the assessment and management of cybersecurity risks. The Senior Director, Information Security & Network Systems and Senior Vice President, Information Technology regularly review and assess cybersecurity initiatives and are informed about and monitor the prevention, detection, mitigation, and remediation of cybersecurity incidents through briefings with internal and external personnel as well as alerts from security measures deployed in the Company's IT environment. These individuals collectively have over 30 years of experience in information security. The Senior Vice President, Information Technology reports to the Board, the Audit Committee and management on cybersecurity risk assessment, policies, incident prevention, detection, mitigation, and remediation of cybersecurity incidents on an as needed basis.

ITEM 2.    PROPERTIES

Our Portfolio

General

As of December 31, 2023, we owned or held interests in 13 consolidated commercial office buildings encompassing approximately 8.4 million rentable square feet and 12 unconsolidated commercial office buildings encompassing approximately 15.4 million rentable square feet located primarily in midtown Manhattan. Many of these buildings include some amount of retail space on the lower floors, as well as basement/storage space. As of December 31, 2023, our portfolio also included ownership interests in one consolidated property, encompassing seven commercial office buildings totaling approximately 0.9 million rentable square feet, in Stamford Connecticut, which we refer to as our Suburban property. Some of these buildings also include a small amount of retail space on the lower floors, as well as basement/storage space.

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As of December 31, 2023, we also owned or held interests in 10 prime retail properties encompassing approximately 0.3 million square feet, 6 buildings in differing stages of development or redevelopment encompassing approximately 4.3 million square feet, and 2 residential building encompassing 209 residential units and 484 dormitory beds, respectively, encompassing approximately 0.4 million square feet. In addition, we manage one office building and one retail building owned by a third party encompassing approximately 0.4 million square feet and held debt and preferred equity investments with a book value of $346.7 million, excluding $7.9 million of investments recorded in balance sheet line items other than the Debt and preferred equity investments line item.

The following tables set forth certain information with respect to each of the Manhattan and Suburban office, prime retail, residential, development and redevelopment properties in the portfolio as of December 31, 2023 (dollars in thousands):

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Total Tenants
MANHATTAN CONSOLIDATED OFFICE PROPERTIES
"Same Store"
100 Church Street	100.0	Downtown	1,047,500	90.3	92.9	$	47,097	$	47,097	18
110 Greene Street	100.0	Soho	223,600	89.7	90.3	17,966		17,966		55
125 Park Avenue	100.0	Grand Central	604,245	99.3	99.3	48,039		48,039		24
304 Park Avenue South	100.0	Midtown South	215,000	100.0	100.0	18,547		18,547		7
420 Lexington Ave (Graybar)	100.0	Grand Central North	1,188,000	86.6	87.3	81,510		81,510		167
461 Fifth Avenue	100.0	Midtown	200,000	76.0	76.0	13,949		13,949		13
485 Lexington Avenue	100.0	Grand Central North	921,000	73.9	76.3	46,469		46,469		27
555 West 57th Street	100.0	Midtown West	941,000	97.8	97.8	55,679		55,679		10
711 Third Avenue	100.0 (3)	Grand Central North	524,000	95.3	95.3	34,953		34,953		21
810 Seventh Avenue	100.0	Times Square	692,000	81.3	82.0	40,523		40,523		40
1185 Avenue of the Americas	100.0	Rockefeller Center	1,062,000	70.7	74.4	67,582		67,582		12
1350 Avenue of the Americas	100.0	Rockefeller Center	562,000	72.0	75.2	32,790		32,790		43
Subtotal / Weighted Average			8,180,345	85.1%	86.6%	$	505,104	$	505,104	437
"Non Same Store"
885 Third Avenue	100.0	Midtown/Plaza District	218,796	81.3	81.3	$	11,612	$	11,612	12
Subtotal / Weighted Average			218,796	81.3%	81.3%	$	11,612	$	11,612	12
Total / Weighted Average Manhattan Consolidated Office Properties			8,399,141	85.0%	86.4%	$	516,716	$	516,716	449
MANHATTAN UNCONSOLIDATED OFFICE PROPERTIES
"Same Store"
10 East 53rd Street	55.0	Plaza District	354,300	98.1	98.1	$	33,529	$	18,441	40
11 Madison Avenue	60.0	Park Avenue South	2,314,000	96.2	96.2	168,090		100,854		9
100 Park Avenue	50.0	Grand Central South	834,000	77.4	77.4	55,913		27,956		36
280 Park Avenue	50.0	Park Avenue	1,219,158	94.1	94.1	134,037		67,019		37
800 Third Avenue	60.5	Grand Central North	526,000	78.8	83.4	31,670		19,161		38
919 Third Avenue	51.0	Grand Central North	1,454,000	80.0	80.0	83,623		42,648		9
1515 Broadway	56.9	Times Square	1,750,000	99.7	99.7	136,705		77,785		7
Worldwide Plaza (4)	25.0	Westside	2,048,725	91.8	91.8	146,260		36,491		22
Added to Same Store in 2023
One Vanderbilt Avenue	71.0	Grand Central	1,657,198	97.8	99.4	272,560		193,545		39
220 East 42nd Street	51.0	Grand Central	1,135,000	88.4	88.4	67,721		34,538		31
Subtotal / Weighted Average			13,292,381	91.7%	92.1%	$	1,130,108	$	618,438	268
"Non Same Store"
245 Park Avenue	50.1	Park Avenue	1,782,793	74.6	83.2	$	132,115	$	66,189	13
450 Park Avenue	25.1	Park Avenue	337,000	82.3	92.5	34,979		8,780		21
Subtotal / Weighted Average			2,119,793	75.8%	84.7%	$	167,094	$	74,969	34
Total / Weighted Average Manhattan Unconsolidated Office Properties			15,412,174	89.5%	91.1%	$	1,297,202	$	693,407	302
Manhattan Office Grand Total / Weighted Average			23,811,315	87.9%	89.4%	$	1,813,918	$	1,210,123	751
Manhattan Office Same Store Occupancy %—Combined			21,472,726	89.2%	90.0%

26

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Total Tenants
SUBURBAN CONSOLIDATED OFFICE PROPERTIES
"Same Store" Suburban
Landmark Square	100.0	Stamford, Connecticut	862,800	77.1	77.1	$	19,378	$	19,378	100
Subtotal/Weighted Average			862,800	77.1%	77.1%	$	19,378	$	19,378	100
Total / Weighted Average Suburban Consolidated Office Properties			862,800	77.1%	77.1%	$	19,378	$	19,378	100
Suburban Office Grand Total / Weighted Average			862,800	77.1%	77.1%	$	19,378	$	19,378	100

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Total Tenants
RETAIL PROPERTIES
"Same Store" Retail
85 Fifth Avenue	36.3	Midtown South	12,946	100.0	100.0	$	2,250	$	816	1
Subtotal/Weighted Average			12,946	100.0%	100.0%	$	2,250	$	816	1
"Non Same Store" Retail
760 Madison Avenue	100.0	Plaza District	22,648	100.0	100.0	$	18,362	$	18,362	1
Subtotal/Weighted Average			22,648	100.0%	100.0%	$	18,362	$	18,362	1
Total / Weighted Average Retail Properties			35,594	100.0%	100.0%	$	20,612	$	19,178	2

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	Total Units		% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Average Monthly Rent Per Unit ($'s) (5)
RESIDENTIAL
"Non Same Store" Residential
7 Dey Street	100.0	Lower Manhattan	140,382	209		95.2	96.7	$	11,385	$	11,384	$	4,767
15 Beekman Street	20.0	Downtown	221,884	484	(6)	100.0	100.0	13,473		2,695		—
Subtotal/Weighted Average			362,266	693		98.6%	99.0%	$	24,858	$	14,079	$	4,767
Total / Weighted Average Residential Properties			362,266	693		98.6%	99.0%	$	24,858	$	14,079	$	4,767

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Total Tenants
DEVELOPMENT/REDEVELOPMENT
19 East 65th Street	100.0	Plaza District	14,639	5.5	5.5	$	32	$	32	1
185 Broadway	100.0	Lower Manhattan	50,206	34.5	34.5	3,323		3,323		4
625 Madison Avenue	90.4	Plaza District	563,000	—	—	—		—		—
750 Third Avenue	100.0	Grand Central North	780,000	17.7	17.7%	10,876		10,876		21
One Madison Avenue	25.5	N/A	1,396,426	N/A	N/A	N/A		N/A		N/A
760 Madison - Residential Condominiums	100.0	N/A	35,926	N/A	N/A	N/A		N/A		N/A
Subtotal/Weighted Average			2,840,197	11.1%	11.1%	$	14,231	$	14,231	26
Total / Weighted Average Development/Redevelopment Properties			2,840,197	11.1%	11.1%	$	14,231	$	14,231	26

27

Properties	Ownership Interest (%)	SubMarket	Square Feet (1)	% Occupied (2)	% Leased (3)	Annualized Contractual Cash Rent ($'s)		Annualized Contractual Cash Rent SLG Share ($'s)		Total Tenants
ALTERNATIVE STRATEGY PORTFOLIO
2 Herald Square (7)	51.0	Herald Square	369,000	34.5	34.5	$	19,815	$	10,106	4
5 Times Square	31.6	Times Square	1,127,931	23.3	23.3	27,069		8,540		3
11 West 34th Street	30.0	Herald Square/Penn Station	17,150	100.0	100.0	3,480		1,044		1
115 Spring Street	51.0	Soho	5,218	100.0	100.0	3,984		2,032		1
650 Fifth Avenue	50.0	Plaza District	69,214	100.0	100.0	40,064		20,032		1
690 Madison Avenue	100.0	Plaza District	7,848	100.0	100.0	1,505		1,505		1
717 Fifth Avenue (8)	10.9	Midtown/Plaza District	119,550	90.4	90.4	29,362		3,206		5
719 Seventh Avenue	75.0	Times Square	10,040	—	—	—		—		—
1552-1560 Broadway	50.0	Times Square	57,718	88.3	88.3	30,764		15,382		3
Worldwide Plaza (9)	25.0	Westside	2,048,725	91.8	91.8	146,256		36,490		22
Subtotal/Weighted Average			3,832,394	66.0%	66.0%	$	302,299	$	98,337	41
Total / Weighted Average Alternative Strategy Portfolio Properties			3,832,394	66.0%	66.0%	$	302,299	$	98,337	41

(1)Represents the rentable square footage at the time the property was acquired.

(2)Occupancy for commenced leases.

(3)Occupancy inclusive of leases signed but not yet commenced.

(4)Alternative Strategy Portfolio property.

(5)Calculated based on occupied units. Amount in dollars.

(6)Property occupied by Pace University and used as an academic center and dormitory space. 484 represents number of beds.

(7)The Company closed on the acquisition of additional interests in the joint venture in January 2024, which increased the Company's interest to 95%.

(8)Along with its joint venture partner, the Company closed on the sale of this property in January 2024.

(9)Property included in Manhattan Operating Properties as of December 31, 2023.

Historical Occupancy

Historically, we have achieved materially higher occupancy rates in our Manhattan office portfolio as compared to the overall midtown Manhattan office market, as shown in the following table:

	Occupancy Rate of Manhattan Operating Portfolio (1)	Occupancy Rate of Class A Office Properties in the Midtown Manhattan Markets (2)(3)	Occupancy Rate of Class B Office Properties in the Midtown Manhattan Markets (2)(3)
December 31, 2023	89.4%	78.4%	75.5%
December 31, 2022	90.7%	78.4%	76.6%
December 31, 2021	92.1%	80.6%	77.1%
December 31, 2020	92.4%	85.0%	81.1%
December 31, 2019	94.5%	88.8%	87.4%

(1)Includes our consolidated and unconsolidated Manhattan office properties.

(2)Includes vacant space available for direct lease and sublease. Source: Cushman & Wakefield.

(3)The term "Class B" is generally used in the Manhattan office market to describe office properties that are more than 25 years old but that are in good physical condition, enjoy widespread acceptance by high-quality tenants and are situated in desirable locations in Manhattan. Class B office properties can be distinguished from Class A properties in that Class A properties are generally newer properties with higher finishes and frequently obtain the highest rental rates within their markets.

Lease Expirations

Leases in our Manhattan portfolio, as at many other Manhattan office properties, typically have an initial term of seven to fifteen years, compared to typical lease terms of five to ten years in other large U.S. office markets. For the five years ending December 31, 2028, the average annual lease expirations at our Manhattan consolidated and unconsolidated operating properties is expected to be approximately 0.7 million square feet and approximately 0.6 million square feet, respectively, representing an average annual expiration rate of approximately 9.2% and approximately 4.0%, respectively, per year (assuming no tenants exercise renewal or cancellation options and there are no tenant bankruptcies or other tenant defaults).

The following tables set forth a schedule of the annual lease expirations at our Manhattan consolidated and unconsolidated operating properties, respectively, with respect to leases in place as of December 31, 2023 for each of the next ten years and thereafter (assuming that no tenants exercise renewal or cancellation options and that there are no tenant bankruptcies or other tenant defaults):

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Manhattan Consolidated Operating Properties
Year of Lease Expiration	Number of Expiring Leases (1)	Square Footage of Expiring Leases	Percentage of Total Square Feet	Annualized Cash Rent of Expiring Leases (2)		Percentage of Annualized Cash Rent of Expiring Leases	Annualized Cash Rent per Square Foot of Expiring Leases (3)
2024(4)	75	668,722	8.8%	$	38,699,697	7.5%	$	57.87
2025	71	680,624	9.0	55,301,323		10.7	81.25
2026	54	776,991	10.2	53,956,330		10.4	69.44
2027	55	650,165	8.6	52,559,470		10.2	80.84
2028	53	698,668	9.2	52,371,028		10.1	74.96
2029	33	591,177	7.8	38,909,520		7.5	65.82
2030	22	696,540	9.2	49,396,547		9.6	70.92
2031	18	321,405	4.2	22,841,818		4.4	71.07
2032	16	669,608	8.8	40,664,070		7.9	60.73
2033 & thereafter	60	1,835,137	24.2	112,016,314		21.7	61.04
Total/weighted average	457	7,589,037	100.0%	$	516,716,117	100.0%	$	68.09

(1)Tenants may have multiple leases.

(2)Represents the monthly contractual rent under existing leases as of December 31, 2023 multiplied by 12. This amount reflects total rent before any rent abatements, deferrals, concessions and includes expense reimbursements, which may be estimated as of such date.

(3)Represents Annualized Cash Rent of Expiring Leases, as described in footnote (2) above, presented on a per square foot basis.

(4)Includes approximately 177,309 square feet and annualized cash rent of $10.0 million occupied by month-to-month holdover tenants whose leases expired prior to December 31, 2023.

Manhattan Unconsolidated Operating Properties
Year of Lease Expiration	Number of Expiring Leases (1)	Square Footage of Expiring Leases	Percentage of Total Square Feet	Annualized Cash Rent of Expiring Leases (2)		Percentage of Annualized Cash Rent of Expiring Leases	Annualized Cash Rent per Square Foot of Expiring Leases (3)
2024(4)	34	946,092	6.8%	$	104,741,363	8.1%	$	110.71
2025	26	373,433	2.7	36,125,921		2.8	96.74
2026	42	802,152	5.8	89,411,068		6.9	111.46
2027	29	352,724	2.5	44,741,842		3.4	126.85
2028	30	305,851	2.2	35,200,396		2.7	115.09
2029	17	893,912	6.4	64,603,106		5.0	72.27
2030	21	505,445	3.6	51,835,737		4.0	102.55
2031	27	2,912,088	21.0	219,024,122		16.9	75.21
2032	15	1,075,978	7.8	95,341,186		7.3	88.61
2033 & thereafter	75	5,714,468	41.2	556,177,116		42.9	97.33
Total/weighted average	316	13,882,143	100.0%	$	1,297,201,857	100.0%	$	93.44

(1)Tenants may have multiple leases.

(2)Represents the monthly contractual rent under existing leases as of December 31, 2023 multiplied by 12. This amount reflects total rent before any rent abatements, deferrals, concessions and includes expense reimbursements, which may be estimated as of such date.

(3)Represents Annualized Cash Rent of Expiring Leases, as described in footnote (2) above, presented on a per square foot basis.

(4)Includes approximately 114,048 square feet and annualized cash rent of $11.9 million occupied by month-to-month holdover tenants whose leases expired prior to December 31, 2023.

Tenant Diversification

As of December 31, 2023, our properties were leased to 920 tenants, which are engaged in a variety of businesses, including, but not limited to, financial services, professional services, technology, advertising, media, information, apparel, business services and government/non-profit. The following table sets forth information regarding the leases with respect to the 20 largest tenants in our properties, which are not intended to be representative of our tenants as a whole, based on the amount of our share of annualized cash rent as of December 31, 2023:

29

Tenant Name	Property	Lease Expiration (1)	Total Rentable Square Feet	Annualized Cash Rent		SLG Share of Annualized Cash Rent ($)		% of SLG Share of Annualized Cash Rent (2)		Annualized Cash Rent per Square Foot
Paramount Global (formerly ViacomCBS Inc.)	1515 Broadway	June 2031	1,603,126	$	105,728	$	60,159	4.5	%	$	65.95
	555 West 57th Street	April 2029	180,779	10,048		10,047		0.8	%	55.58
	555 West 57th Street	December 2023	137,072	7,251		7,251		0.5	%	52.90
	1515 Broadway	March 2028	9,106	2,113		1,203		0.1	%	232.09
	Worldwide Plaza	January 2027	32,598	2,526		630		—	%	77.49
			1,962,681	$	127,666	$	79,290	5.9	%	$	65.05
Credit Suisse Securities (USA), Inc.	11 Madison Avenue	May 2037	1,184,762	$	75,934	$	45,561	3.4	%	$	64.09
Sony Corporation	11 Madison Avenue	January 2031	578,791	$	50,959	$	30,575	2.3	%	$	88.04
TD Bank US Holding Company	One Vanderbilt Avenue	July 2041	193,159	$	25,412	$	18,045	1.3	%	$	131.56
	One Vanderbilt Avenue	August 2041	6,843	3,234		2,296		0.2	%	472.58
	125 Park Avenue	October 2025	6,234	2,029		2,029		0.2	%	325.47
	125 Park Avenue	October 2030	26,536	1,835		1,835		0.1	%	69.16
	125 Park Avenue	March 2034	25,171	1,611		1,611		0.1	%	64.00
			257,943	$	34,121	$	25,816	1.9	%	$	132.28
Bloomberg L.P.	919 Third Avenue	February 2029	749,216	$	50,549	$	25,780	1.9	%	$	67.47
Societe Generale	245 Park Avenue	October 2032	520,831	$	50,566	$	25,334	1.9	%	$	97.09
Carlyle Investment Management LLC	One Vanderbilt Avenue	September 2036	194,702	$	32,994	$	23,429	1.7	%	$	169.46
The City of New York	100 Church Street	March 2034	510,007	$	21,145	$	21,145	1.6	%	$	41.46
King & Spalding	1185 Avenue of the Americas	October 2025	218,275	$	21,134	$	21,134	1.6	%	$	96.82
Metro-North Commuter Railroad Company (3)	420 Lexington Avenue	November 2034	344,873	$	19,905	$	19,905	1.5	%	$	57.72
	420 Lexington Avenue	January 2027	7,537	444		444		—	%	58.89
			352,410	$	20,349	$	20,349	1.5	%	$	57.74
Nike Retail Services, Inc.	650 Fifth Avenue	January 2033	69,214	$	40,064	$	20,032	1.5	%	$	578.84
WME IMG, LLC	304 Park Avenue	April 2028	174,069	$	13,641	$	13,641	1.0	%	$	78.36
	11 Madison Avenue	September 2030	104,618	10,504		6,303		0.5	%	100.41
			278,687	$	24,145	$	19,944	1.5	%	$	86.64
Giorgio Armani Corporation	760 Madison Avenue	October 2038	22,648	$	18,362	$	18,362	1.4	%	$	810.76
	717 Fifth Avenue (4)	December 2023	46,940	2,300		251		—	%	49.00
			69,588	$	20,662	$	18,613	1.4	%	$	296.92
McDermott Will & Emery LLP	One Vanderbilt Avenue	December 2042	146,642	$	24,857	$	17,651	1.4	%	$	169.51
	420 Lexington Avenue	October 2026	10,043	619		619		—	%	61.60
			156,685	$	25,476	$	18,270	1.4	%	$	162.59
Toronto Dominion Bank	One Vanderbilt Avenue	April 2042	142,892	$	20,466	$	14,533	1.1	%	$	143.23
	125 Park Avenue	April 2042	52,450	3,583		3,583		0.2	%	68.32
			195,342	$	24,049	$	18,116	1.3	%	$	123.12
Cravath, Swaine & Moore LLP	Worldwide Plaza	August 2024	617,135	$	70,134	$	17,498	1.3	%	$	113.64
Stone Ridge Holdings Group LP (3)	One Vanderbilt Avenue	December 2037	97,652	$	22,014	$	15,632	1.2	%	225.43
Hess Corp	1185 Avenue of the Americas	December 2027	167,169	$	15,540	$	15,540	1.2	%	$	92.96
BMW of Manhattan, Inc.	555 West 57th Street	July 2032	226,556	$	12,857	$	12,857	1.0	%	$	56.75
Greenberg Traurig LLP	One Vanderbilt Avenue	October 2037	99,888	$	12,661	$	8,990	0.7	%	$	126.75
	420 Lexington Avenue	November 2037	49,049	$	3,355	$	3,356	0.2	%	$	68.41
			148,937	$	16,016	$	12,346	0.9	%	$	107.54
Total			8,556,583	$	756,374	$	487,261	36.4	%	$	88.40

(1)Expiration of current lease term and does not reflect extension options.

(2)SLG Share of Annualized Cash Rent includes Manhattan, Suburban, Retail, Residential and Development / Redevelopment properties.

(3)Tenant pays rent on a net basis. Rent PSF reflects gross equivalent.

(4)The asset was sold in January 2024.

30

Environmental Matters

Phase I environmental site assessments have been prepared on the properties in our portfolio, in order to assess existing environmental conditions. All of the Phase I assessments met the American Society for Testing and Materials (ASTM) Standard. Under the ASTM Standard, a Phase I environmental site assessment consists of a site visit, an historical record review, a review of regulatory agency data bases and records, and interviews with on-site personnel, with the purpose of identifying potential environmental concerns associated with real estate. These environmental site assessments did not reveal any known environmental liability that we believe will have a material adverse effect on our results of operations or financial condition.

ITEM 3.    LEGAL PROCEEDINGS

As of December 31, 2023, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

31

PART II

ITEM 5.    MARKET FOR REGISTRANTS' COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

SL GREEN REALTY CORP.

Our common stock trades on the New York Stock Exchange, or the NYSE, under the symbol "SLG." On February 22, 2024, the reported closing sale price per share of common stock on the NYSE was $46.76 and there were 419 holders of record of our common stock.

SL GREEN OPERATING PARTNERSHIP, L.P.

As of December 31, 2023, there were 3,949,448 units of limited partnership interest of the Operating Partnership outstanding and held by persons other than the Company, which received distributions per unit of the same amount and in the same manner as dividends per share were distributed to common stockholders.

There is no established public trading market for the common units of the Operating Partnership. On February 22, 2024, there were 52 holders of record and 69,221,575 common units outstanding, 64,799,013 of which were held by SL Green.

In order for SL Green 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). SL Green has adopted a policy of paying regular dividends on its common stock, and the Operating Partnership has adopted a policy of paying regular distributions to its common units in the same amount as dividends paid by SL Green. Cash distributions have been paid on the common stock of SL Green and the common units of the Operating Partnership since the initial public offering of SL Green. Distributions are declared at the discretion of the Board of Directors of SL Green and depend on actual and anticipated cash from operations, financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Internal Revenue Code and other factors SL Green’s Board of Directors may consider relevant.

Each time SL Green issues shares of stock (other than in exchange for common units of limited partnership interest of the Operating Partnership, or OP Units, when such OP Units are presented for redemption), it contributes the proceeds of such issuance to the Operating Partnership in return for an equivalent number of units of limited partnership interest with rights and preferences analogous to the shares issued.

ISSUER PURCHASES OF EQUITY SECURITIES

In August 2016, our Board of Directors approved a share repurchase program under which we could buy up to $1.0 billion of shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, during the three months ended December 31, 2023:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
October 1-31	—	$—	36,107,719
November 1-30	—	$—	36,107,719
December 1-31	—	$—	36,107,719

SALE OF UNREGISTERED SECURITIES

During the years ended December 31, 2023, 2022, and 2021 we did not issue any shares of our common stock to holders of units of limited partnership interest in the Operating Partnership upon the redemption of such units pursuant to the partnership agreement of the Operating Partnership.

ITEM 6.    [RESERVED]

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ITEM 7.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

SL Green Realty Corp., which is referred to as SL Green or the Company, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Company is a self-managed real estate investment trust, or REIT, engaged in the ownership, management, operation, acquisition, development, redevelopment and repositioning of commercial real estate properties, principally office properties, located in the New York metropolitan area, principally Manhattan. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

The following discussion related to our consolidated financial statements should be read in conjunction with the financial statements appearing in Item 8 of this Annual Report on Form 10-K. A discussion of our results of operations for the year ended December 31, 2022 compared to the year ended December 31, 2021 is included in Part II, Item 7 Management's Discussion and Analysis of Financial Condition and Results of Operations of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 17, 2023, and is incorporated by reference into this Annual Report on Form 10-K.

Leasing and Operating

As of December 31, 2023, our same-store Manhattan office property occupancy inclusive of leases signed but not commenced, was 90.0% compared to 91.2% as of December 31, 2022. We signed office leases in Manhattan encompassing approximately 1.8 million square feet, of which approximately 1.2 million square feet represented office leases that replaced previously occupied space.

According to Cushman & Wakefield, 2023 leasing activity in Manhattan totaled approximately 18.0 million square feet. Of the total 2023 leasing activity in Manhattan, the Midtown submarket accounted for approximately 12.6 million square feet, or approximately 70.0%. Manhattan's overall office vacancy went from 22.2% as of December 31, 2022 to 22.8% as of December 31, 2023. Overall average asking rents in Manhattan increased in 2023 by 2.4% from $71.62 per square foot as of December 31, 2022 to $73.33 per square foot as of December 31, 2023, while Manhattan Class A asking rents increased to $80.98 per square foot, up 2.9% from $78.72 as of December 31, 2022.

Acquisition and Disposition Activity

Overall Manhattan sales volume decreased by 39.9% in 2023 to $13.8 billion as compared to $23.0 billion in 2022. In 2023, we continued to sell joint venture interests in quality assets as well as dispose of properties that were considered non-core or had a more limited growth trajectory, raising efficiently priced capital that was used primarily for debt reduction. During the year, we closed on the sales of all or a portion of our interests in 245 Park Avenue, 121 Greene Street and 21 East 66th Street for total gross valuations of $2.0 billion, generating net proceeds to the Company of $176.9 million.

Debt and Preferred Equity

In 2022 and 2023, in our debt and preferred equity portfolio we continued to focus on underwriting financings for owners, acquirers or developers of properties in New York City. At the same time, we selectively sold certain investments, some investments were repaid, and we converted some investments into equity ownership, the proceeds of which were utilized to repurchase shares of common stock or for debt repayment. Our investment strategy provides us with the opportunity to fill a need for additional debt financing, while achieving attractive risk adjusted returns to us on the investments and receiving a significant amount of additional information on the New York City real estate market. During 2023, our debt and preferred equity activities included $80.3 million, inclusive of advances under future funding obligations, discount and fee amortization, and paid-in-kind interest, net of premium amortization, and investments with a carrying value of $349.9 million that were transferred to equity ownership.

For descriptions of significant activities in 2023, refer to "Part I, Item 1. Business - Highlights from 2023."

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Critical Accounting Policies and Estimates

Our discussion and analysis of financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, and contingencies as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. We evaluate our assumptions and estimates on an ongoing basis. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. We believe the following critical accounting policies affect our more significant judgments and estimates used in the preparation of our consolidated financial statements.

Investment in Commercial Real Estate Properties

Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major investments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.

We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity by allocating the purchase price, including transaction costs, at their respective fair values on the acquisition date.

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases.

The allocation of the purchase price to the tangible and intangible assets acquired and liabilities assumed involves subjectivity as the allocations are based on an analysis of the respective fair values. In determining the fair value of the real estate acquired, the Company will use a third-party valuation which primarily utilizes cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. We assess fair value of the acquired leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. The determined and allocated fair values to the real estate acquired will affect the amount of depreciation and amortization we record over the respective estimated useful lives or term of the lease.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if i) the lease transfers ownership of the asset at the end of the lease term, ii) the lease grants an option to purchase the asset that we are reasonably certain to exercise, iii) the lease term is for a major part of the remaining economic life of the asset, or iv) the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense.

We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy and capitalize only those costs associated with the portions under construction.

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On a periodic basis, we assess whether there are any indications that the value of our consolidated real estate properties may be impaired or that their carrying value may not be recoverable. A consolidated property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the fair value of the property as calculated in accordance with ASC 820. We assess for impairment indicators based on factors such as, among other things, market conditions, occupancy rates, collections, and the overall operating performance of the asset. If indicators of impairment are present, we evaluate real estate investments for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts.

We also evaluate our real estate properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded. See Note 4, "Properties Held for Sale and Property Dispositions."

Investments in Unconsolidated Joint Ventures

We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. Unless we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these VIE entities. Determining control of the entities can be subjective in assessing which activities of the joint venture most significantly impact the economic performance and whether the rights of the joint venture partner are protective or participating. In making this determination, any new or amended joint venture agreement is assessed by the Company for the activities that most significantly impact the joint venture’s economic performance based on the business purpose and design of the venture. We assess the rights that are conveyed to us in the agreement and evaluate whether we are provided with participating or protective rights over the activities that most significantly impact the entity’s economic performance. We also assess the rights of our joint venture partner. Such participating rights include, among other things, the right to approve/amend the annual budget, leasing of the property to a significant tenant, and approval of tax returns and auditors. If our joint venture partner has substantive participating rights and we are determined not to be the primary beneficiary, we do not consolidate the entity.

These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases for tenant space, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans.

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired as of December 31, 2023.

We may originate loans for real estate acquisition, development and construction ("ADC loans") where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments.

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Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease and we have determined that the collectability of substantially all of the lease payments are probable. If collectability of substantially all of the lease payments is assessed as not probable, rental revenue is recognized only upon actual receipt. The Company assesses the probability of collecting substantially all payments under its leases based on multiple factors, including, among other things, payment history of the lessee, the credit rating of the lessee, historical operations and trends within the lessee’s industry, current and future economic conditions. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

Rental revenue recognition commences when the leased space is available for its intended use by the lessee. To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we are the owner of tenant improvements for accounting purposes or the tenant is. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

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The Company assesses the probability of a borrower’s ability to repay the debt and preferred equity investment similar to the factors noted above. We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Revenues from the sale of SUMMIT tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $2.6 million and $2.0 million, respectively, and is included in Deferred revenue on the consolidated balance sheets.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or 3 are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

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Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to the be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Write offs of accrued interest receivables are recognized as an expense for loan loss and other investment reserves.

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Results of Operations

Comparison of the year ended December 31, 2023 to the year ended December 31, 2022

The following comparison for the year ended December 31, 2023, or 2023, to the year ended December 31, 2022, or 2022, makes reference to the effect of the following:

i.“Same-Store Properties,” which represents all operating properties owned by us at January 1, 2022 and still owned by us in the same manner as of December 31, 2023 (Same-Store Properties totaled 20 of our 27 consolidated operating properties),

ii.“Acquisition Properties,” which represents all properties or interests in properties acquired in 2023 and 2022 and all non-Same-Store Properties, including properties that are under development or redevelopment,

iii."Disposed Properties" which represents all properties or interests in properties sold in 2023 and 2022,

iv."Alternative Strategy Portfolio," which represents non-core assets, and

v.“Other,” which represents properties where we sold an interest resulting in deconsolidation and corporate level items not allocable to specific properties, as well as the Service Corporation and eEmerge Inc.

	Same-Store								Disposed				Other				Consolidated
(in millions)	2023		2022		$ Change		% Change		2023		2022		2023		2022		2023		2022		$ Change		% Change
Rental revenue	$	549.6	$	556.7	$	(7.1)	(1.3)	%	$	—	$	0.9	$	133.7	$	113.9	$	683.3	$	671.5	$	11.8	1.8	%
SUMMIT Operator revenue	—		—		—		—	%	—		—		118.3		89.0		118.3		89.0		29.3		32.9	%
Investment income	—		—		—		—	%	—		—		34.7		81.1		34.7		81.1		(46.4)		(57.2)	%
Other income	4.1		3.9		0.2		5.1	%	—		10.4		73.3		63.5		77.4		77.8		(0.4)		(0.5)	%
Total revenues	553.7		560.6		(6.9)		(1.2)	%	—		11.3		360.0		347.5		913.7		919.4		(5.7)		(0.6)	%
Property operating expenses	277.0		266.7		10.3		3.9	%	0.2		2.0		90.3		70.5		367.5		339.2		28.3		8.3	%
SUMMIT Operator expenses	—		—		—		—	%	—		—		101.2		89.2		101.2		89.2		12.0		13.5	%
Transaction related costs	—		—		—		—	%	—		—		1.1		0.4		1.1		0.4		0.7		175.0	%
Marketing, general and administrative	—		—		—		—	%	—		—		111.4		93.8		111.4		93.8		17.6		18.8	%
	277.0		266.7		10.3		3.9	%	0.2		2.0		304.0		253.9		581.2		522.6		58.6		11.2	%
Other income (expenses):
Interest expense and amortization of deferred financing costs, net of interest income																	$	(145.0)	$	(97.3)	$	(47.7)	49.0	%
SUMMIT Operator tax expense																	(9.2)		(2.6)		(6.6)		253.8	%
Depreciation and amortization																	(247.8)		(216.2)		(31.6)		14.6	%
Equity in net loss from unconsolidated joint ventures																	(76.5)		(58.0)		(18.5)		31.9	%
Equity in net loss on sale of interest in unconsolidated joint venture/real estate																	(13.4)		(0.1)		(13.3)		13,300.0	%
Purchase price and other fair value adjustments																	(17.3)		(8.1)		(9.2)		113.6	%
Loss on sale of real estate, net																	(32.4)		(84.5)		52.1		(61.7)	%
Depreciable real estate reserves and impairments																	(382.4)		(6.3)		(376.1)		5,969.8	%
Loss on early extinguishment of debt																	(0.9)		—		(0.9)		—	%
Loan loss and other investment reserves, net of recoveries																	(6.9)		—		(6.9)		—	%
Net loss																	$	(599.3)	$	(76.3)	$	(523.0)	685.5	%

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Rental Revenue

    Rental revenues increased due primarily to the acquisition of 245 Park Avenue ($23.3 million) during the third quarter of 2022 and prior to its deconsolidation in the second quarter of 2023, offset by a lower contribution from our Same-Store Properties due primarily to reduced occupancy ($7.0 million).

The following table presents a summary of the commenced leasing activity for the year ended December 31, 2023 in our Manhattan portfolio:

	Usable SF	Rentable SF	New Cash Rent (per rentable SF) (1)		Prev. Escalated Rent (per rentable SF) (2)		TI/LC per rentable SF		Free Rent (in months)	Average Lease Term (in years)
Manhattan
Space available at beginning of the year	2,227,978
Acquired vacancies	51,490
Property out of redevelopment	(56,718)
Space which became available during the year(3)
•       Office	1,337,519
•       Retail	38,650
•       Storage	13,282
	1,389,451
Total space available	3,612,201
Leased space commenced during the year:
•       Office(4)	665,886	727,901	$	75.65	$	77.59	$	68.67	7.3	6.4
•       Retail	33,607	36,674	$	85.04	$	180.38	$	69.53	11.1	14.0
•       Storage	6,215	8,236	$	28.00	$	17.25	$	—	3.3	9.9
Total leased space commenced	705,708	772,811	$	75.59	$	77.19	$	67.98	7.5	6.8
Total available space at end of year	2,906,493
Early renewals
•       Office	654,708	723,334	$	84.08	$	80.64	$	41.75	5.8	7.2
•       Retail	17,087	17,252	$	195.10	$	192.91	$	—	—	4.8
•       Storage	5,146	5,554	$	31.46	$	33.07	$	—	3.6	6.0
Total early renewals	676,941	746,140	$	86.26	$	82.88	$	40.48	5.6	7.1
Total commenced leases, including replaced previous vacancy
•       Office		1,451,235	$	79.85	$	79.41	$	55.25	6.5	6.8
•       Retail		53,926	$	120.25	$	191.53	$	47.29	7.5	11.1
•       Storage		13,790	$	29.39	$	24.30	$	—	3.4	8.4
Total commenced leases		1,518,951	$	80.83	$	80.61	$	54.47	6.6	6.9

(1)Annual initial base rent.

(2)Escalated rent includes base rent plus all additional amounts paid by the tenant in the form of real estate taxes, operating expenses, porters wage or a consumer price index (CPI) adjustment.

(3)Includes expiring space, relocating tenants and move-outs where tenants vacated. Excludes lease expirations where tenants held over.

(4)Average starting office rent excluding new tenants replacing vacancies was $77.08 per rentable square feet for 485,280 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $81.27 per rentable square feet for 1,208,614 rentable square feet.

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SUMMIT Operator revenue

SUMMIT Operator revenues were higher for the year ended December 31, 2023, compared to the same period in 2022 due primarily to increased attendance.

Investment Income

Investment income decreased due to a lower weighted average debt and preferred equity investment balance and a lower weighted average yield for the period ended December 31, 2023 as compared to the same period in 2022 as well as the recognition of previously unrecorded default interest on our preferred equity investment at 245 Park Avenue in the third quarter of 2022. For the years ended December 31, 2023 and 2022, the weighted average balance of our debt and preferred equity investment portfolio and the weighted average yield were $0.6 billion and 6.2%, respectively, compared to $1.0 billion and 8.3%, respectively. As of December 31, 2023, the debt and preferred equity investment portfolio had a weighted average term to maturity of 1.9 years excluding extension options.

Other Income

Other income decreased primarily due to income related to the resolution of the Company's investment in 1591-1597 Broadway ($5.0 million) in the second quarter of 2022. This decrease was offset by increases in lease termination income ($1.1 million), and an increase in special servicing income for the year ended December 31, 2023 ($1.1 million) as compared to the same period in 2022.

Property Operating Expenses

Property operating expenses increased due primarily to acquiring 245 Park Avenue ($8.6 million) in the third quarter of 2022 and prior to its deconsolidation in the second quarter of 2023, increased variable expenses ($7.5 million) and real estate taxes ($2.8 million) at our Same-Store Properties, and increased variable expenses at our Acquired Properties ($7.8 million), partially offset by decreased variable expenses at our Disposed Properties ($1.2 million).

SUMMIT Operator expenses

SUMMIT Operator expenses were higher for the year ended December 31, 2023, compared to the same period in 2022 due to additional operating hours in 2023 to accommodate demand, which increased variable costs such as labor, security, cleaning and maintenance costs.

Marketing, General and Administrative Expenses

Marketing, general and administrative expenses increased to $111.4 million for the year ended December 31, 2023, compared to $93.8 million for the same period in 2022 due to increased compensation expense related to the non-renewal of the Company's former President ($18.7 million).

Interest Expense and Amortization of Deferred Financing Costs, Net of Interest Income

Interest expense and amortization of deferred financing costs, net of interest income, increased due to rising LIBOR and SOFR rates, higher interest expense from unsecured corporate term loans ($32.9 million) and the revolving credit facility ($20.5 million) for the year ended December 31, 2023 as compared to the year ended December 31, 2022, acquiring 245 Park Avenue in the third quarter of 2022 ($8.0 million) prior to its deconsolidation in the second quarter of 2023, and the refinancing of 100 Church ($7.9 million) in the second quarter of 2022. These increases were offset primarily by the repayment of unsecured bonds ($20.9 million) in the third quarter of 2022. The weighted average consolidated debt balance outstanding was $4.6 billion for the year ended December 31, 2023 as compared to $4.6 billion for the year ended December 31, 2022. The consolidated weighted average interest rate was 4.71% for the year ended December 31, 2023 as compared to 3.55% for the year ended December 31, 2022.

SUMMIT Operator tax expense

The increase in SUMMIT Operator income tax expense for the year ended December 31, 2023 compared to the same period in 2022 was attributable to higher taxable income for SUMMIT Operator.

Depreciation and Amortization

Depreciation and amortization increased primarily due to acquiring 245 Park Avenue ($20.3 million) in the third quarter of 2022 and prior to its deconsolidation in the second quarter of 2023, an increase at our Acquired Properties ($8.6 million) and Same-Store Properties ($2.5 million) for the year ended December 31, 2023.

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Equity in net loss from unconsolidated joint ventures

Equity in net loss from unconsolidated joint ventures increased as a result of increased interest expense across our joint venture portfolio ($67.6 million). This was partially offset by additional income at 2 Herald Square ($29.8 million) comprised primarily of holdover rent, interest, settlement income, lease termination income and reimbursement of attorneys' fees collected following the completion of legal proceedings against a former tenant and its guarantor, as well as an increase in income from operations at One Vanderbilt Avenue ($22.9 million).

Equity in net loss on sale of interest in unconsolidated joint venture/real estate

During the year ended December 31, 2023, we recognized losses on the sales of our interests in 21 East 66th Street ($12.7 million) and 121 Greene Street ($0.3 million). During the year ended December 31, 2022, we recognized a loss on the sale of our interest in the Stonehenge Portfolio (less than $0.1 million).

Purchase price and other fair value adjustments

During the year ended December 31, 2023, we recorded a $17.0 million fair value adjustment relating to the 50.1% interest we retained in 245 Park Avenue, which was deconsolidated when a 49.9% joint venture interest was sold. Additionally, we recorded a $10.4 million fair value adjustment related to derivatives that are not designated as hedges for accounting purposes. This was partially offset by a $10.2 million purchase price adjustment related to a previous transaction. During the year ended December 31, 2022, we recorded a $6.4 million fair value adjustment related to an investment in marketable securities and a $1.7 million fair value adjustment related to derivatives that are not designated as hedges.

Loss on sale of real estate, net

During the year ended December 31, 2023, we recognized a loss on the sale of a 49.9% joint venture interest in 245 Park Avenue ($32.8 million). During the year ended December 31, 2022, we recognized losses on the sales of 609 Fifth Avenue ($80.2 million), 885 Third Avenue ($24.0 million) and 707 Eleventh Avenue ($0.8 million), offset by a gain on the sale of 1080 Amsterdam Avenue ($17.9 million).

Depreciable Real Estate Reserves and Impairments

During the year ended December 31, 2023, we recognized depreciable real estate reserves and impairments related to our leasehold interest at 625 Madison Avenue ($272.6 million), which was under contract for sale as of December 31, 2023, 2 Herald Square ($101.7 million) and 1552-1560 Broadway ($8.0 million) following an assessment of the investments for recoverability. During the year ended December 31, 2022, we recognized depreciable real estate reserves and impairments related to 121 Greene Street ($6.3 million) as the investment was under contract for sale as of December 31, 2022.

Loan loss and other investment reserves, net of recoveries

During the year ended December 31, 2023, we recorded $6.9 million of loan loss reserve on one debt and preferred equity investment. During the year ended December 31, 2022, we did not recognize any loan loss and other investment reserves.

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

For a comparison of the year ended December 31, 2022 to the year ended December 31, 2021, see "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II, Item 7 of our Form 10-K for the year ended December 31, 2022, which was filed with the SEC on February 17, 2023.

Liquidity and Capital Resources

We currently expect that the principal sources of funds to meet our short-term and long-term liquidity requirements for working capital, acquisitions, development or redevelopment of properties, tenant improvements, leasing costs, share repurchases, dividends to shareholders, distributions to unitholders, repurchases or repayments of outstanding indebtedness and for debt and preferred equity investments will include:

(1)Cash flow from operations;

(2)Cash on hand;

(3)Net proceeds from divestitures of properties and redemptions, participations, dispositions and repayments of debt and preferred equity investments;

(4)Borrowings under the revolving credit facility;

(5)Other forms of secured or unsecured financing; and

(6)Proceeds from common or preferred equity or debt offerings by the Company or the Operating Partnership (including issuances of units of limited partnership interest in the Operating Partnership and Trust preferred securities).

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Cash flow from operations is primarily dependent upon the collectability of rent, the occupancy level of our portfolio, the net effective rental rates achieved on our leases, the collectability of rent, operating escalations and recoveries from our tenants and the level of operating and other costs. Additionally, we believe that our debt and preferred equity investment program will continue to serve as a source of operating cash flow.

The combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, senior unsecured notes (net of discount), trust preferred securities, our share of joint venture debt, including as-of-right extension options and put options, estimated interest expense, and our obligations under our financing and operating leases, as of December 31, 2023 are as follows (in thousands):

	2024		2025		2026		2027		2028		Thereafter		Total
Property mortgages and other loans	$	387,238	$	370,000	$	190,148	$	550,000	$	—	$	—	$	1,497,386
Revolving credit facility	—		—		—		560,000		—		—		560,000
Unsecured term loans	200,000		—		—		1,050,000		—		—		1,250,000
Senior unsecured notes	—		100,000		—		—		—		—		100,000
Trust preferred securities	—		—		—		—		—		100,000		100,000
Financing leases	3,180		3,228		3,276		3,325		3,375		196,794		213,178
Operating leases	53,455		53,595		53,734		53,746		54,211		1,208,864		1,477,605
Estimated interest expense	173,873		132,568		115,747		35,264		4,829		32,796		495,077
Company's share of joint venture debt	1,822,978		1,670,861		542,968		1,185,168		—		2,130,300		7,352,275
Total	$	2,640,724	$	2,330,252	$	905,873	$	3,437,503	$	62,415	$	3,668,754	$	13,045,521

We estimate that for the year ending December 31, 2024, we expect to incur $79.0 million of recurring capital expenditures on existing consolidated properties and $80.0 million of development or redevelopment expenditures on existing consolidated properties, none of which will be funded by construction financing facilities or loan reserves. We expect our share of capital expenditures at our joint venture properties will be $183.6 million, of which $99.2 million will be funded by construction financing facilities or loan reserves. We expect to fund capital expenditures from operating cash flow, existing liquidity, and borrowings from construction financing facilities. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs.

As of December 31, 2023, we had liquidity of $0.9 billion, comprised of $688.0 million of availability under our revolving credit facility and $231.4 million of consolidated cash on hand, inclusive of $9.6 million of marketable securities. This liquidity excludes $161.9 million representing our share of cash at unconsolidated joint venture properties. We may seek to divest of properties, interests in properties, or debt and preferred equity investments or access private and public debt and equity capital when the opportunity presents itself, although there is no guarantee that this capital will be made available to us at efficient levels or at all. Management believes that these sources of liquidity, if we are able to access them, along with potential refinancing opportunities for secured and unsecured debt, will allow us to satisfy our debt and other obligations, as described above, upon maturity, if not before.

We have investments in several real estate joint ventures with various partners who are generally considered to be financially stable. Most of our joint ventures are financed with non-recourse debt. We believe that property level cash flows along with unfunded committed indebtedness and proceeds from the refinancing of outstanding secured indebtedness will be sufficient to fund the capital needs of our joint venture properties.

Cash Flows

The following summary discussion of our cash flows is based on our consolidated statements of cash flows in "Item 1. Financial Statements" and is not meant to be an all-inclusive discussion of the changes in our cash flows for the years presented below.

Cash, restricted cash, and cash equivalents were $335.5 million and $384.1 million as of December 31, 2023 and 2022, respectively, representing a decrease of $48.6 million. The decrease was a result of the following changes in cash flows (in thousands):

	Year Ended December 31,
	2023		2022		(Decrease) Increase
Net cash provided by operating activities	$	229,503	$	276,088	$	(46,585)
Net cash provided by investing activities	$	171,345	$	425,805	$	(254,460)
Net cash used in financing activities	$	(449,383)	$	(654,823)	$	205,440

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Our principal sources of operating cash flow are the properties in our consolidated and joint venture portfolios and our debt and preferred equity portfolio. These sources generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service, and fund dividend and distribution requirements.

Cash is used in investing activities to fund acquisitions, development or redevelopment projects and recurring and nonrecurring 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 that meet our investment criteria. During the year ended December 31, 2023, when compared to the year ended December 31, 2022, we used cash primarily for the following investing activities (in thousands):

Acquisitions of real estate	$	64,491
Capital expenditures and capitalized interest	41,107
Joint venture investments	37
Distributions from joint ventures	(1,173)
Proceeds from disposition of real estate/joint venture interest	(68,753)
Cash and restricted cash assumed from acquisition of real estate investment	(60,494)
Debt and preferred equity and other investments	(229,675)
Decrease in net cash provided by investing activities	$	(254,460)

Funds spent on capital expenditures, which are comprised of building and tenant improvements, decreased from $300.8 million for the year ended December 31, 2022 to $259.7 million for the year ended December 31, 2023 due to lower costs incurred in connection with our development and redevelopment properties.

We generally fund our investment activity through the sale of real estate, the sale of debt and preferred equity investments, property-level financing, our credit facilities, senior unsecured notes, and construction loans. From time to time, the Company may issue common or preferred stock, or the Operating Partnership may issue common or preferred units of limited partnership interest. During the year ended December 31, 2023, when compared to the year ended December 31, 2022, we used cash for the following financing activities (in thousands):

Proceeds from our debt obligations	$	(1,367,980)
Repayments of our debt obligations	1,302,538
Net distribution to noncontrolling interests	(41,817)
Other financing activities	94,213
Repurchase of common stock	151,197
Redemption of preferred stock	6,267
Acquisition of subsidiary interest from noncontrolling interest	29,817
Dividends and distributions paid	31,205
Increase in net cash used in financing activities	$	205,440

Capitalization

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, $0.01 par value per share. As of December 31, 2023, 64,726,253 shares of common stock and no shares of excess stock were issued and outstanding.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we could buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

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The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, for the years ended December 31, 2023, 2022 and 2021 as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719
Year ended 2023	—	$—	36,107,719

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")

In February 2021 the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2023, 2022, and 2021, respectively (dollars in thousands):

	Year Ended December 31,
	2023		2022		2021
Shares of common stock issued	17,180		10,839		10,387
Dividend reinvestments/stock purchases under the DRSPP	$	525	$	525	$	738

Fifth Amended and Restated 2005 Stock Option and Incentive Plan

The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 at the Company's annual meeting of stockholders. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 32,210,000 fungible units may be granted as options, restricted stock, phantom shares, dividend equivalent rights and other equity-based awards under the 2005 Plan. As of December 31, 2023, 3.9 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units and phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of our common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the year ended December 31, 2023, 39,302 phantom stock units and 27,739 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.7 million during the year ended December 31, 2023 related to the Deferred Compensation Plan. As of December 31, 2023, there were 230,295 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

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Employee Stock Purchase Plan

In 2007, the Company's Board of Directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to provide equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of December 31, 2023, 224,159 shares of our common stock had been issued under the ESPP.

Indebtedness

The table below summarizes our consolidated mortgages and other loans payable, 2021 credit facility, 2022 term loan, senior unsecured notes and trust preferred securities outstanding as of December 31, 2023 and 2022, (amounts in thousands).

Debt Summary:	December 31, 2023			December 31, 2022
Balance
Fixed rate	$	1,117,386		$	2,695,814
Variable rate—hedged	2,120,000			2,320,000
Total fixed rate	3,237,386			5,015,814
Total variable rate	270,000			520,148
Total debt	$	3,507,386		$	5,535,962
Debt, preferred equity, and other investments subject to variable rate	168,745			144,056
Net exposure to variable rate debt	101,255			376,092
Percent of Total Debt:
Fixed rate	92.3		%	90.6		%
Variable rate (1)	7.7		%	9.4		%
Total	100.0		%	100.0		%
Effective Interest Rate for the Year:
Fixed rate	4.68		%	3.60		%
Variable rate	6.11		%	3.23		%
Effective interest rate	4.71		%	3.55		%

(1)    Inclusive of the mitigating effect of our debt, preferred equity, and other investments subject to variable rates, the percent of total debt of our net exposure to variable rate debt was 3.0% and 7.0% as of December 31, 2023 and December 31, 2022, respectively.

The variable rate debt shown above generally bears interest at an interest rate based on 30-day LIBOR (0.00% and 4.39% as of December 31, 2023 and 2022, respectively), and adjusted Term SOFR (5.35% and 4.30% as of December 31, 2023 and 2022, respectively). Our consolidated debt as of December 31, 2023 had a weighted average term to maturity of 2.69 years.

Certain of our debt and equity investments and other investments, with carrying values of $168.7 million as of December 31, 2023 and $144.1 million as of December 31, 2022, are variable rate investments, which mitigate our exposure to interest rate changes on our unhedged variable rate debt. Inclusive of the mitigating effect of these investments, the net ratio of our variable rate debt to total debt was 3.0% and 7.0% as of December 31, 2023 and 2022, respectively.

Mortgage Financing

As of December 31, 2023, our total mortgage debt (excluding our share of joint venture mortgage debt of $7.4 billion) consisted of $1.4 billion of fixed rate debt, including swapped variable rate debt, with an effective weighted average interest rate of 4.84% and $0.1 billion of variable rate debt with an effective weighted average interest rate of 6.05%.

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Corporate Indebtedness

2021 Credit Facility

In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2023, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of December 31, 2023, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

As of December 31, 2023, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 165 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2023, the facility fee was 30 basis points.

As of December 31, 2023, we had $2.0 million of outstanding letters of credit, $560.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $688.0 million under the 2021 credit facility. As of December 31, 2023 and December 31, 2022, the revolving credit facility had a carrying value of $554.8 million and $443.2 million, respectively, net of deferred financing costs. As of December 31, 2023 and December 31, 2022, the term loan facilities had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

In October 2022, we entered into a term loan agreement, referred to as the 2022 term loan. The 2022 term loan was repaid in full in September 2023. The 2022 term loan consisted of a $425.0 million term loan with a maturity date of October 6, 2023. The 2022 term loan had one six-month as-of-right extension option to April 6, 2024. We also had an option, subject to customary conditions, to increase the capacity of the 2022 term loan to $500.0 million on or before January 7, 2023 without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. In January 2023, the 2022 term loan was increased by $25.0 million to $425.0 million.

The 2022 term loan bore interest at a spread over adjusted Term SOFR plus 0.001 basis points, ranging from 100 basis points to 180 basis points, in each case based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. In instances where there were either only two ratings available or where there was more than two and the difference between them was one rating category, the applicable rating was the highest rating. In instances where there were more than two ratings and the difference between the highest and the lowest were two or more rating categories, then the applicable rating used was the average of the highest two, rounded down if the average was not a recognized category. As of December 31, 2022, the 2022 term loan had a carrying value of $398.2 million, net of deferred financing costs.

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Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2023 and 2022, respectively, by scheduled maturity date (dollars in thousands):

	December 31, 2023				December 31, 2022
Issuance	Unpaid Principal Balance		Accreted Balance		Accreted Balance		Interest Rate (1)		Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000	4.27	%	10	December 2025
	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(205)		(308)
	$	100,000	$	99,795	$	99,692

(1)Interest rate as of December 31, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2023 and 2022, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Interest Rate Risk

We are exposed to changes in interest rates primarily from our variable rate debt. Our exposure to interest rate fluctuations are managed through either the use of interest rate derivative instruments and/or through our variable rate debt and preferred equity investments. Based on the debt outstanding as of December 31, 2023, a hypothetical 100 basis point increase in the floating rate interest rate curve would increase our consolidated annual interest cost, net of interest income from variable rate debt and preferred equity investments, by $1.0 million and would increase our share of joint venture annual interest cost by $12.2 million. As of December 31, 2023, $168.7 million, or 90.5%, of our $346.7 million debt and preferred equity portfolio was indexed to SOFR.

We recognize most derivatives on the balance sheet at fair value. Derivatives that are not hedges are adjusted to fair value through income. If a derivative is considered a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset, liability, or firm commitment through earnings, or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings.

Our consolidated long-term debt of $3.2 billion bears interest at fixed rates, and therefore the fair value of these instruments is affected by changes in the market interest rates. Our variable rate debt and variable rate joint venture debt as of December 31, 2023 bore interest based on a spread to LIBOR of 145 basis points and Term SOFR of 50 basis points to 565 basis points.

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Off-Balance Sheet Arrangements

We have off-balance sheet investments, including joint ventures and debt and preferred equity investments. These investments all have varying ownership structures. A majority of our joint venture arrangements are accounted for under the equity method of accounting as we have the ability to exercise significant influence, but not control, over the operating and financial decisions of these joint venture arrangements. Our off-balance sheet arrangements are discussed in Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures" in the accompanying consolidated financial statements.

Dividends/Distributions

We expect to pay dividends to our stockholders based on the distributions we receive from our Operating Partnership.

To maintain our qualification as a REIT, we must pay annual dividends to our stockholders of at least 90% of our REIT taxable income, determined before taking into consideration the dividends paid deduction and net capital gains.

Any dividend we pay may be in the form of cash, stock, or a combination thereof, subject to IRS limitations on the use of stock for dividends. Additionally, if our REIT taxable income in a particular year exceeds the amount of cash dividends we pay in that year, we may pay stock dividends in order to maintain our REIT status and avoid certain REIT-level taxes.

Before we pay any cash dividend, whether for Federal income tax purposes or otherwise, which would only be paid out of available cash to the extent permitted under the 2021 credit facility and senior unsecured notes, we must first meet both our operating requirements and scheduled debt service on our mortgages and loans payable.

Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Prior to 2023, Alliance Building Services, or Alliance, and its affiliates, which provide services to certain properties owned by us, were previously partially owned by Gary Green, a son of Stephen L. Green, who serves as a member and as the chairman emeritus of our Board of Directors. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements.

Income earned from the profit participation prior to 2023, which is included in Other income on the consolidated statements of operations, was $1.4 million and $1.7 million for the years ended December 31, 2022 and 2021, respectively. We also recorded expenses, inclusive of capitalized expenses, of $8.6 million and $14.0 million for these services (excluding services provided directly to tenants) for the years ended December 31, 2022 and 2021, respectively.

One Vanderbilt Avenue Investment

Our Chairman and CEO, Marc Holliday, and our former President, Andrew Mathias, made investments in our One Vanderbilt project (inclusive of the property and SUMMIT One Vanderbilt), which entitles Mr. Holliday and Mr. Mathias to receive approximately 1.27% and 0.85%, respectively, on account of the property and 1.92% and 1.28%, respectively, on account of SUMMIT One Vanderbilt, of any profits realized by the Company from its One Vanderbilt project in excess of the Company's capital contributions. Mr. Holliday and Mr. Mathias paid $1.4 million and $1.0 million, respectively, which equaled the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

Messrs. Holliday and Mathias have the right to tender their interests in the project upon stabilization (50% within three years after stabilization and 100% three years or more after stabilization). In addition, the agreement calls for us to repurchase these interests in the event of a sale of One Vanderbilt or a transactional change of control of the Company. We also have the right to repurchase these interests on the 7-year anniversary of the stabilization of the project or upon the occurrence of certain separation events prior to the stabilization of the project relating to each of Messrs. Holliday’s and Mathias’s continued service with us. The price paid upon a tender of the interests will equal the liquidation value of the interests at the time, with the value being based on the project's sale price, if applicable, or fair market value as determined by an independent third party appraiser. In 2022, stabilization of the property (but not SUMMIT One Vanderbilt) was achieved. Therefore, Messrs. Holiday and Mathias exercised their rights to tender 50% of their interests in the property (but not SUMMIT One Vanderbilt) for liquidation values of $17.9 million and $11.9 million, respectively, which were paid in July 2022.

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One Vanderbilt Avenue Leases

In November 2018, we entered into a lease agreement with the One Vanderbilt Avenue joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the year ended December 31, 2023 and 2022 we recorded $3.0 million and $3.0 million, respectively, of rent expense under the lease. Additionally, in June 2021, we, through a consolidated subsidiary, entered into a lease agreement with the One Vanderbilt Avenue joint venture for SUMMIT One Vanderbilt, which commenced operations in October 2021. For the year ended December 31, 2023, we recorded $38.9 million of rent expense under the lease, including percentage rent, of which $26.2 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the year ended December 31, 2022, we recorded $33.0 million of rent expense under the lease, including percentage rent, of which $22.8 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. See Note 20, "Commitments and Contingencies."

Insurance

We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR")), within two property insurance programs and liability insurance. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. However, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned by the Company or its affiliates.

Furthermore, with respect to certain of our properties, including properties held by joint ventures or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss.

Funds from Operations

FFO is a widely recognized non-GAAP financial measure of REIT performance. The Company computes FFO in accordance with standards established by NAREIT, which may not be comparable to FFO reported by other REITs that do not compute FFO in accordance with the NAREIT definition, or that interpret the NAREIT definition differently than the Company does. The revised White Paper on FFO approved by the Board of Governors of NAREIT in April 2002, and subsequently amended in December 2018, defines FFO as net income (loss) (computed in accordance with GAAP), excluding gains (or losses) from sales of properties and real estate related impairment charges, plus real estate related depreciation and amortization and after adjustments for unconsolidated partnerships and joint ventures.

The Company presents FFO because it considers it an important supplemental measure of the Company’s operating performance and believes that it is frequently used by securities analysts, investors and other interested parties in the evaluation of REITs, particularly those that own and operate commercial office properties. The Company also uses FFO as one of several criteria to determine performance-based compensation for members of its senior management. FFO is intended to exclude GAAP historical cost depreciation and amortization of real estate and related assets, which assumes that the value of real estate assets diminishes ratably over time. Historically, however, real estate values have risen or fallen with market conditions. Because FFO excludes depreciation and amortization unique to real estate, gains and losses from property dispositions, and real estate related impairment charges, it provides a performance measure that, when compared year over year, reflects the impact to operations from trends in occupancy rates, rental rates, operating costs, and interest costs, providing perspective not immediately apparent from net income. FFO does not represent cash generated from operating activities in accordance with GAAP and should not be considered as an alternative to net income (determined in accordance with GAAP), as an indication of the Company’s financial performance or to cash flow from operating activities (determined in accordance with GAAP) as a measure of the Company’s liquidity, nor is it indicative of funds available to fund the Company’s cash needs, including our ability to make cash distributions.

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FFO for the years ended December 31, 2023, 2022, and 2021 are as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Net (loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Add:
Depreciation and amortization	247,810		216,167		216,969
Joint venture depreciation and noncontrolling interest adjustments	284,284		252,893		249,087
Net (loss) income attributable to noncontrolling interests	(42,033)		(4,672)		23,573
Less:
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)		(131)		(32,757)
Purchase price and other fair value adjustments	(6,813)		—		209,443
(Loss) gain on sale of real estate, net	(32,370)		(84,485)		287,417
Depreciable real estate reserves and impairments	(382,374)		(6,313)		(23,794)
Depreciation on non-rental real estate assets	4,136		3,466		2,890
Funds from Operations attributable to SL Green common stockholders and unit holders	$	341,341	$	458,827	$	481,234
Cash flows provided by operating activities	$	229,503	$	276,088	$	255,979
Cash flows provided by investing activities	$	171,345	$	425,805	$	993,581
Cash flows used in financing activities	$	(449,383)	$	(654,823)	$	(1,285,371)

Seasonality

Our business at SUMMIT is subject to tourism trends and weather conditions, resulting in seasonal fluctuation. In 2023 and 2022, approximately 14.0% to 16.0% of our annual SUMMIT revenue was realized in the first quarter, 24.0% to 26.0% was realized in the second quarter, 28.0% to 30.0% was realized in the third quarter, and 29.0% to 31.0% was realized in the fourth quarter. We do not consider any other components of our business to be subject to material seasonal fluctuations.

Climate Change

With our roots in New York City, we are at the center of one of the world's most ambitious climate legislative environments. Through the Climate Leadership and Community Protection Act signed into law in 2019, New York State mandated the adoption of a net-zero carbon economy statewide by 2050, with a zero-carbon electricity grid by 2040. New York City enacted Local Law 97 (LL97) in 2019 under the Climate Mobilization Act, setting carbon caps for large buildings starting in 2024 as part of a broader commitment to reducing greenhouse gas emissions by 40% by 2030, and by 80% by 2050. As our portfolio is principally located in Manhattan, these policy elements represent the most material sources of transition risks relevant to our business. We do not anticipate any material financial impact on our portfolio in the first compliance period of 2024 to 2029.

While SL Green's portfolio has not been substantially affected by climate-related events to New York City real estate, such as Hurricane Sandy in 2012, we have continued to develop our approach to physical climate risk assessment, management, and mitigation in order to manage and minimize the impacts of future events. We have conducted climate-related scenario analyses as part of our first Task Force on Climate-related Financial Disclosures ("TCFD") report published in 2021 and 2023, which we made available on our website. The Company has committed to near-term Scope 1 and Scope 2 science-based emissions reduction targets with the SBTi, which were approved in early 2023. Our goal is to reduce emissions for our operationally controlled portfolio to align it with the 1.5 degree Celsius climate scenario.

We consider the successful management and mitigation of climate-related risks across our portfolio as an opportunity to raise the financial value of our buildings and pass on these benefits to our stakeholders, tenants, and investors. We believe our investments over the last 20 years in energy efficiency improvements and greenhouse gas emissions reductions have minimized the impact of climate legislation on our portfolio and our active development pipeline sets the standard for sustainable new construction and responsible community engagement. We leverage years of operational excellence to incorporate innovative design and technological solutions. We also utilize recommendations from our portfolio-wide New York State Energy Research and Development Authority ("NYSERDA") emissions reduction study to help lower emissions from tenant spaces and base building operations. Together, these measures are expected to minimize our vulnerability to the physical risks of climate change, as well as transition risks covering policy and legal, market, technology, and reputational factors.

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Accounting Standards Updates

The Accounting Standards Updates are discussed in Note 2, "Significant Accounting Policies - Accounting Standards Updates" in the accompanying consolidated financial statements.

Forward-Looking Information

This report includes certain statements that may be deemed to be "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and are intended to be covered by the safe harbor provisions thereof. All statements, other than statements of historical facts, included in this report that address activities, events or developments that we expect, believe or anticipate will or may occur in the future, including such matters as future capital expenditures, dividends and acquisitions (including the amount and nature thereof), development trends of the real estate industry and the New York metropolitan area markets, business strategies, expansion and growth of our operations and other similar matters, are forward-looking statements. These forward-looking statements are based on certain assumptions and analyses made by us in light of our experience and our perception of historical trends, current conditions, expected future developments and other factors we believe are appropriate.

Forward-looking statements are not guarantees of future performance and actual results or developments may differ materially, and we caution you not to place undue reliance on such statements. Forward-looking statements are generally identifiable by the use of the words "may," "will," "should," "expect," "anticipate," "estimate," "believe," "intend," "project," "continue," or the negative of these words, or other similar words or terms.

Forward-looking statements contained in this report are subject to a number of risks and uncertainties that may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by forward-looking statements made by us. These risks and uncertainties include:

•the effect of general economic, business and financial conditions, and their effect on the New York City real estate market in particular;

•dependence upon the New York City real estate market;

•risks of real estate acquisitions, dispositions, development and redevelopment, including the cost of construction delays and cost overruns;

•risks relating to debt and preferred equity investments;

•availability and creditworthiness of prospective tenants and borrowers;

•bankruptcy or insolvency of a major tenant or a significant number of smaller tenants or borrowers;

•adverse changes in the real estate markets, including reduced demand for office space, increasing vacancy, and increasing availability of sublease space;

•availability of debt and equity capital for our operational needs and investment strategy;

•unanticipated increases in financing and other costs, including a rise in interest rates;

•our ability to comply with financial covenants in our debt instruments;

•our ability to maintain our status as a REIT;

•risks of investing through joint venture structures, including the fulfillment by our partners of their financial obligations;

•the threat of terrorist attacks;

•our ability to obtain adequate insurance coverage at a reasonable cost and the potential for losses in excess of our insurance coverage, including as a result of environmental contamination; and

•legislative, regulatory and/or safety requirements adversely affecting REITs and the real estate business including costs of compliance with the Americans with Disabilities Act, the Fair Housing Act and other similar laws and regulations.

Other factors and risks to our business, many of which are beyond our control, are described in other sections of this report and in our other filings with the SEC. Except to the extent required by law, we undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of future events, new information or otherwise.

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ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

See Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations—Market Rate Risk" for additional information regarding our exposure to interest rate fluctuations.

The table below presents the principal cash flows based upon maturity dates of our debt obligations and debt and preferred equity investments and the weighted-average interest rates by expected maturity dates, including as-of-right extension options, as of December 31, 2023 (in thousands):

	Long-Term Debt								Debt and Preferred Equity Investments (1)
	Fixed Rate		Average Interest Rate		Variable Rate		Average Interest Rate		Amount		Weighted Yield
2024	$	477,238	4.98	%	$	110,000	6.03	%	$	120,422	9.07	%
2025	470,000		4.82	%	—		4.57	%	30,000		8.52	%
2026	190,148		4.72	%	—		4.57	%	48,323		10.46	%
2027	2,000,000		4.74	%	160,000		4.55	%	128,000		6.55	%
2028	—		4.75	%	—		—	%	—		—	%
Thereafter	100,000		4.92	%	—		—	%	20,000		8.11	%
Total	$	3,237,386	4.84	%	$	270,000	5.19	%	$	346,745	8.23	%
Fair Value	$	3,184,338			$	268,787

(1)Our debt and preferred equity investments had an estimated fair value of approximately $0.3 billion as of December 31, 2023.

The table below presents the principal cash flows based upon maturity dates of our share of our joint venture debt obligations and the weighted-average interest rates by expected maturity dates, including as-of-right extension options, as of December 31, 2023 (in thousands):

	Long Term Debt
	Fixed Rate		Average Interest Rate		Variable Rate		Average Interest Rate
2024	$	524,511	4.12	%	$	1,298,467	8.10	%
2025	1,670,861		3.98	%	—		—	%
2026	542,968		3.60	%	—		—	%
2027	1,185,168		3.32	%	—		—	%
2028	—		2.86	%	—		—	%
Thereafter	2,130,300		2.86	%	—		—	%
Total	$	6,053,808	3.76	%	$	1,298,467	8.10	%
Fair Value	$	5,387,516			$	1,292,853

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The table below lists our consolidated derivative instruments, which are hedging variable rate debt, and their related fair values as of December 31, 2023 (in thousands):

	Asset Hedged	Benchmark Rate	Notional Value		Strike Rate		Effective Date	Expiration Date	Fair Value
Interest Rate Swap	Credit Facility	SOFR	$	150,000	2.600	%	December 2021	January 2024	$	11
Interest Rate Swap	Credit Facility	SOFR	200,000		4.490	%	November 2022	January 2024	5
Interest Rate Swap	Credit Facility	SOFR	200,000		4.411	%	November 2022	January 2024	5
Interest Rate Cap	Mortgage	SOFR	370,000		3.250	%	June 2023	June 2024	3,158
Interest Rate Cap	Credit Facility	SOFR	370,000		3.250	%	June 2023	June 2024	(3,145)
Interest Rate Swap	Credit Facility	SOFR	150,000		2.621	%	December 2021	January 2026	4,011
Interest Rate Swap	Credit Facility	SOFR	200,000		2.662	%	December 2021	January 2026	5,196
Interest Rate Swap	Credit Facility	SOFR	100,000		2.903	%	February 2023	February 2027	2,281
Interest Rate Swap	Credit Facility	SOFR	100,000		2.733	%	February 2023	February 2027	2,775
Interest Rate Swap	Credit Facility	SOFR	50,000		2.463	%	February 2023	February 2027	1,781
Interest Rate Swap	Credit Facility	SOFR	200,000		2.591	%	February 2023	February 2027	6,378
Interest Rate Swap	Credit Facility	SOFR	300,000		2.866	%	July 2023	May 2027	7,306
Interest Rate Swap	Credit Facility	SOFR	150,000		3.524	%	January 2024	May 2027	549
Interest Rate Swap	Credit Facility	SOFR	370,000		3.888	%	November 2022	June 2027	(3,044)
Interest Rate Swap	Credit Facility	SOFR	300,000		4.487	%	November 2024	November 2027	(10,273)
Interest Rate Swap	Credit Facility	SOFR	100,000		3.756	%	January 2023	January 2028	(646)
Total Consolidated Hedges									$	16,348

In addition to these derivative instruments, some of our joint venture loan agreements require the joint venture to purchase interest rate caps on its debt. All such interest rate caps represented an asset of $30.7 million in the aggregate as of December 31, 2023. We also swapped certain floating rate debt at some of our joint ventures. These swaps represented an asset of $12.3 million in the aggregate as of December 31, 2023.

	Asset Hedged	Benchmark Rate	Notional Value		Strike Rate		Effective Date	Expiration Date	Fair Value
Interest Rate Cap	Mortgage	SOFR	$	220,000	4.000	%	February 2023	February 2024	$	318
Interest Rate Cap	Mortgage	SOFR	484,069		0.490	%	February 2022	May 2024	8,331
Interest Rate Cap	Mortgage	SOFR	484,069		0.490	%	February 2022	May 2024	8,330
Interest Rate Cap	Mortgage	SOFR	505,412		3.000	%	June 2023	June 2024	4,948
Interest Rate Cap	Mortgage	SOFR	272,000		4.000	%	August 2023	August 2024	1,675
Interest Rate Cap	Mortgage	SOFR	477,783		3.500	%	September 2023	September 2024	5,213
Interest Rate Cap	Mortgage	SOFR	278,161		4.000	%	May 2024	November 2024	948
Interest Rate Cap	Mortgage	SOFR	278,161		4.000	%	May 2024	November 2024	948
Interest Rate Swap	Mortgage	SOFR	250,000		3.608	%	April 2023	February 2026	1,819
Interest Rate Swap	Mortgage	SOFR	250,000		3.608	%	April 2023	February 2026	1,818
Interest Rate Swap	Mortgage	SOFR	177,000		1.555	%	December 2022	February 2026	8,686
Total Unconsolidated Hedges									$	43,034

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Index to Financial Statements and Schedules

FINANCIAL STATEMENTS OF SL GREEN REALTY CORP.
Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)	56
Consolidated Balance Sheets as of December 31, 2023 and 2022	59
Consolidated Statements of Operations for the years ended December 31, 2023, 2022 and 2021	61
Consolidated Statements of Comprehensive (Loss) Income for the years ended December 31, 2023, 2022 and 2021	62
Consolidated Statements of Equity for the years ended December 31, 2023, 2022 and 2021	63
Consolidated Statements of Cash Flows for the years ended December 31, 2023, 2022 and 2021	64
FINANCIAL STATEMENTS OF SL GREEN OPERATING PARTNERSHIP, L.P.
Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)	67
Consolidated Balance Sheets as of December 31, 2023 and 2022	70
Consolidated Statements of Operations for the years ended December 31, 2023, 2022 and 2021	72
Consolidated Statements of Comprehensive (Loss) Income for the years ended December 31, 2023, 2022 and 2021	73
Consolidated Statements of Capital for the years ended December 31, 2023, 2022 and 2021	74
Consolidated Statements of Cash Flows for the years ended December 31, 2023, 2022 and 2021	75
Notes to Consolidated Financial Statements	78
Schedules
Schedule III- Real Estate and Accumulated Depreciation as of December 31, 2023	123
All other schedules are omitted because they are not required or the required information is shown in the financial statements or notes thereto.

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Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of SL Green Realty Corp.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of SL Green Realty Corp. (the Company) as of December 31, 2023 and 2022, the related consolidated statements of operations, comprehensive (loss) income, equity and cash flows for each of the three years in the period ended December 31, 2023, and the related notes and financial statement schedule listed in the Index at Item 15(a)(2) (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 23, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the 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 audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the 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 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 financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the 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.

Joint Venture Consolidation Assessment

Description of the Matter

The Company accounted for certain investments in real estate joint ventures under the equity method of accounting and consolidated certain other investments in real estate joint ventures. At December 31, 2023, the Company’s investments in unconsolidated joint ventures was $3.0 billion and noncontrolling interests in consolidated other partnerships was $69.6 million. As discussed in Note 2 to the consolidated financial statements, for each joint venture, the Company evaluated the rights provided to each party in the venture to assess the consolidation of the venture.

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Table of Contents

How We Addressed the Matter in Our Audit	Auditing management’s joint venture consolidation analyses was complex and highly judgmental due to the subjectivity in assessing which activities most significantly impact a joint venture’s economic performance based on the purpose and design of the entity over the duration of its expected life and assessing which party has rights to direct those activities. We tested the Company’s controls over the assessment of joint venture consolidation. For example, we tested controls over management's review of the consolidation analyses for newly formed ventures as well as controls over management's identification of reconsideration events which could trigger modified consolidation conclusions for existing ventures. To test the Company’s consolidation assessment for real estate joint ventures, our procedures included, among others, reviewing new and amended joint venture agreements and discussing with management the nature of the rights conveyed to the Company through the joint venture agreements as well as the business purpose of the joint venture transactions. We reviewed management’s assessment of the activities that would most significantly impact the joint venture’s economic performance and evaluated whether the joint venture agreements provided participating or protective rights to the Company. We also evaluated transactions with the joint ventures for events which would require a reconsideration of previous consolidation conclusions.
Impairment of Commercial Real Estate Properties and Investments in Unconsolidated Joint Ventures
Description of the Matter	At December 31, 2023, the Company’s commercial real estate properties, at cost totaled approximately $5.0 billion. As described in Note 2 to the consolidated financial statements, real estate properties are periodically reviewed for impairment when circumstances indicate that the carrying value of a property may not be recoverable. For the year ended December 31, 2023, the Company recognized $249.5 million of impairment losses on its commercial real estate properties, which is included in depreciable real estate reserves and impairments in the consolidated statements of operations. At December 31, 2023, the Company’s investments in unconsolidated joint ventures was $3.0 billion. As described in Note 2 to the consolidated financial statements, investments in unconsolidated joint ventures are assessed for recoverability, and if it is determined that a loss in value of the investment is other than temporary, the investment is written down to its fair value. For the year ended December 31, 2023, the Company recognized $132.9 million of other than temporary impairment losses on its investments in unconsolidated joint ventures, which is included in depreciable real estate reserves and impairments in the consolidated statements of operations.
How We Addressed the Matter in Our Audit	Auditing the Company’s accounting for impairment of commercial real estate properties and investments in unconsolidated joint ventures was especially challenging and involved a high degree of subjectivity as a result of the assumptions and estimates inherent in the determination of estimated future cash flows and the estimated fair value of commercial real estate properties and investments in unconsolidated joint ventures. In particular, management’s assumptions and estimates included estimated revenue and expense growth rates, discount rates and capitalization rates, which were sensitive to expectations about future operations, market or economic conditions, demand and competition. We obtained an understanding, evaluated the design, and tested the operating effectiveness of controls over the Company’s commercial real estate properties and investments in unconsolidated joint ventures impairment process. This included testing of controls over management's review of the significant assumptions and data inputs utilized in the estimation of expected future cash flows and the determination of fair value. To test the Company's accounting for impairment of commercial real estate properties and investments in unconsolidated joint ventures, we performed audit procedures that included, among others, evaluating the methodologies applied and testing the significant assumptions discussed above and the underlying data used by the Company in its impairment analyses. We held discussions with management about the current status of potential transactions and the Company’s intent and ability to fund future operations of investments in unconsolidated joint ventures. We also discussed management’s judgments to understand the probability of future events that could affect the holding period and other cash flow assumptions for the properties. In certain cases, we involved our valuation specialists to assist in performing these procedures. We compared the significant assumptions used by management to historical data and observable market-specific data. We also assessed management’s estimates and performed sensitivity analyses of significant assumptions to evaluate the changes in estimated future cash flows that would result from changes in the assumptions. In addition, we assessed information and events subsequent to the balance sheet date to corroborate certain of the key assumptions utilized by management.

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Table of Contents

 /s/ Ernst & Young LLP

We have served as the Company‘s auditor since 1997.

New York, New York

February 23, 2024

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SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands, except per share data)

	December 31, 2023		December 31, 2022
Assets
Commercial real estate properties, at cost:
Land and land interests	$	1,092,671	$	1,576,927
Building and improvements	3,655,624		4,903,776
Building leasehold and improvements	1,354,569		1,691,831
Right of use asset - operating leases	953,236		1,026,265
	7,056,100		9,198,799
Less: accumulated depreciation	(2,035,311)		(2,039,554)
	5,020,789		7,159,245
Cash and cash equivalents	221,823		203,273
Restricted cash	113,696		180,781
Investments in marketable securities	9,591		11,240
Tenant and other receivables	33,270		34,497
Related party receivables	12,168		27,352
Deferred rents receivable	264,653		257,887
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,630 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively	346,745		623,280
Investments in unconsolidated joint ventures	2,983,313		3,190,137
Deferred costs, net	111,463		121,157
Other assets	413,670		546,945
Total assets (1)	$	9,531,181	$	12,355,794
Liabilities
Mortgages and other loans payable, net	$	1,491,319	$	3,227,563
Revolving credit facility, net	554,752		443,217
Unsecured term loans, net	1,244,881		1,641,552
Unsecured notes, net	99,795		99,692
Accrued interest payable	17,930		14,227
Other liabilities	471,401		236,211
Accounts payable and accrued expenses	153,164		154,867
Deferred revenue	134,053		272,248
Lease liability - financing leases	105,531		104,218
Lease liability - operating leases	827,692		895,100
Dividend and distributions payable	20,280		21,569
Security deposits	49,906		50,472
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000		100,000
Total liabilities (1)	5,270,704		7,260,936
Commitments and contingencies
Noncontrolling interests in Operating Partnership	238,051		269,993
Preferred units	166,501		177,943

59

SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands, except per share data)

	December 31, 2023		December 31, 2022
Equity
SL Green stockholders' equity:
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2023 and 2022	221,932		221,932
Common stock, $0.01 par value, 160,000 shares authorized and 65,786 and 65,440 issued and outstanding at December 31, 2023 and 2022, respectively (including 1,060 and 1,060 shares held in treasury at December 31, 2023 and 2022, respectively)	660		656
Additional paid-in-capital	3,826,452		3,790,358
Treasury stock at cost	(128,655)		(128,655)
Accumulated other comprehensive income	17,477		49,604
Retained (deficit) earnings	(151,551)		651,138
Total SL Green stockholders' equity	3,786,315		4,585,033
Noncontrolling interests in other partnerships	69,610		61,889
Total equity	3,855,925		4,646,922
Total liabilities and equity	$	9,531,181	$	12,355,794
(1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

The accompanying notes are an integral part of these consolidated financial statements.

60

SL Green Realty Corp.

Consolidated Statements of Operations

(in thousands, except per share data)

	Year Ended December 31,
	2023		2022		2021
Revenues
Rental revenue, net	$	683,335	$	671,500	$	678,176
SUMMIT Operator revenue	118,260		89,048		16,311
Investment income	34,705		81,113		80,340
Other income	77,410		77,793		86,483
Total revenues	913,710		919,454		861,310
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	196,696		174,063		167,153
Real estate taxes	143,757		138,228		152,835
Operating lease rent	27,292		26,943		26,554
SUMMIT Operator expenses	101,211		89,207		16,219
Interest expense, net of interest income	137,114		89,473		70,891
Amortization of deferred financing costs	7,837		7,817		11,424
SUMMIT Operator tax expense	9,201		2,647		1,000
Depreciation and amortization	247,810		216,167		216,969
Loan loss and other investment reserves, net of recoveries	6,890		—		2,931
Transaction related costs	1,099		409		3,773
Marketing, general and administrative	111,389		93,798		94,912
Total expenses	990,296		838,752		764,661
Equity in net loss from unconsolidated joint ventures	(76,509)		(57,958)		(55,402)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)		(131)		(32,757)
Purchase price and other fair value adjustments	(17,260)		(8,118)		210,070
(Loss) gain on sale of real estate, net	(32,370)		(84,485)		287,417
Depreciable real estate reserves and impairments	(382,374)		(6,313)		(23,794)
Loss on early extinguishment of debt	(870)		—		(1,551)
Net (loss) income	(599,337)		(76,303)		480,632
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	37,465		5,794		(25,457)
Noncontrolling interests in other partnerships	4,568		(1,122)		1,884
Preferred units distributions	(7,255)		(6,443)		(7,305)
Net (loss) income attributable to SL Green	(564,559)		(78,074)		449,754
Perpetual preferred stock dividends	(14,950)		(14,950)		(14,950)
Net (loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Basic (loss) earnings per share	$	(9.12)	$	(1.49)	$	6.57
Diluted (loss) earnings per share	$	(9.12)	$	(1.49)	$	6.50
Basic weighted average common shares outstanding	63,809		63,917		65,740
Diluted weighted average common shares and common share equivalents outstanding	67,972		67,929		70,769

The accompanying notes are an integral part of these consolidated financial statements.

61

SL Green Realty Corp.

Consolidated Statements of Comprehensive (Loss) Income

(in thousands)

	Year Ended December 31,
	2023		2022		2021
Net (loss) income	$	(599,337)	$	(76,303)	$	480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)		103,629		21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)		(1,440)		104
Other comprehensive (loss) income	(34,087)		102,189		21,531
Comprehensive (loss) income	(633,424)		25,886		502,163
Net loss (income) attributable to noncontrolling interests and preferred units distributions	34,778		(1,771)		(30,878)
Other comprehensive loss (income) attributable to noncontrolling interests	1,960		(5,827)		(1,042)
Comprehensive (loss) income attributable to SL Green	$	(596,686)	$	18,288	$	470,243

The accompanying notes are an integral part of these consolidated financial statements.

62

SL Green Realty Corp.

Consolidated Statements of Equity

(in thousands, except per share data)

	SL Green Realty Corp. Stockholders
				Common Stock
		Series I Preferred Stock		Shares	Par Value		Additional Paid- In-Capital		Treasury Stock		Accumulated Other Comprehensive (Loss) Income		Retained (Deficit) Earnings		Noncontrolling Interests		Total
Balance at December 31, 2020		$	221,932	66,474	$	716	$	3,862,949	$	(124,049)	$	(67,247)	$	1,015,462	$	26,032	$	4,935,795
Net income													449,754		(1,884)		447,870
Other comprehensive income											20,489						20,489
Perpetual preferred stock dividends													(14,950)				(14,950)
DRSPP proceeds				11			738										738
Reallocation of noncontrolling interest in the Operating Partnership													(9,851)				(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				108	2		32,581										32,583
Repurchases of common stock				(4,474)	(46)		(281,206)						(56,372)				(337,624)
Proceeds from stock options exercised				12			818										818
Contributions to consolidated joint venture interests															336		336
Sale of interest in partially owned entity															(4,476)		(4,476)
Cash distributions to noncontrolling interests															(6,631)		(6,631)
Issuance of special dividend paid in stock				1,974			123,529		(2,111)				2,111				123,529
Cash distributions declared ($6.2729 per common share, none of which represented a return of capital for federal income tax purposes)													(410,373)				(410,373)
Balance at December 31, 2021		$	221,932	64,105	$	672	$	3,739,409	$	(126,160)	$	(46,758)	$	975,781	$	13,377	$	4,778,253
Net loss													(78,074)		1,122		(76,952)
Acquisition of subsidiary interest from noncontrolling interest							(29,742)								(75)		(29,817)
Other comprehensive income											96,362						96,362
Perpetual preferred stock dividends													(14,950)				(14,950)
DRSPP proceeds				11			525										525
Reallocation of noncontrolling interest in the Operating Partnership													39,974				39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				274	4		32,030										32,034
Repurchases of common stock				(1,971)	(20)		(114,979)						(36,198)				(151,197)
Contributions to consolidated joint venture interests															52,164		52,164
Cash distributions to noncontrolling interests															(4,699)		(4,699)
Issuance of special dividend paid in stock				1,961			163,115		(2,495)								160,620
Cash distributions declared ($3.6896 per common share, none of which represented a return of capital for federal income tax purposes)													(235,395)				(235,395)
Balance at December 31, 2022		$	221,932	64,380	$	656	$	3,790,358	$	(128,655)	$	49,604	$	651,138	$	61,889	$	4,646,922
Net loss													(564,559)		(4,568)		(569,127)
Other comprehensive loss											(32,127)						(32,127)
Perpetual preferred stock dividends													(14,950)				(14,950)
DRSPP proceeds				17			525										525
Reallocation of noncontrolling interest in the Operating Partnership													(15,486)				(15,486)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				329	4		35,569										35,573
Contributions to consolidated joint venture interests															15,066		15,066
Cash distributions to noncontrolling interests															(2,777)		(2,777)
Cash distributions declared ($3.2288 per common share, none of which represented a return of capital for federal income tax purposes)													(207,694)				(207,694)
Balance at December 31, 2023		$	221,932	64,726	$	660	$	3,826,452	$	(128,655)	$	17,477	$	(151,551)	$	69,610	$	3,855,925

The accompanying notes are an integral part of these consolidated financial statements.

63

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(in thousands, except per share data)

	Year Ended December 31,
	2023		2022		2021
Operating Activities
Net (loss) income	$	(599,337)	$	(76,303)	$	480,632
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	255,647		223,984		228,393
Equity in net loss from unconsolidated joint ventures	76,509		57,958		55,402
Distributions of cumulative earnings from unconsolidated joint ventures	9,897		780		824
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	13,368		131		32,757
Purchase price and other fair value adjustments	17,260		8,118		(210,070)
Depreciable real estate reserves and impairments	382,374		6,313		23,794
Loss (gain) on sale of real estate, net	32,370		84,485		(287,417)
Loan loss and other investment reserves, net of recoveries	6,890		—		2,931
Loss on early extinguishment of debt	870		—		1,551
Deferred rents receivable	(17,903)		(5,749)		(6,701)
Non-cash lease expense	20,435		22,403		17,234
Other non-cash adjustments	28,174		(5,676)		37,164
Changes in operating assets and liabilities:
Tenant and other receivables	(1,725)		14,370		(20,561)
Related party receivables	15,788		6,666		(8,727)
Deferred lease costs	(17,427)		(21,792)		(10,117)
Other assets	(1,922)		(28,204)		20,245
Accounts payable, accrued expenses, other liabilities and security deposits	11,974		(30,839)		(66,387)
Deferred revenue	8,057		18,332		(1,727)
Change in lease liability - operating leases	(11,796)		1,111		(33,241)
Net cash provided by operating activities	229,503		276,088		255,979
Investing Activities
Acquisitions of real estate property	$	—	$	(64,491)	$	(152,791)
Additions to land, buildings and improvements	(259,663)		(300,770)		(302,486)
Investments in unconsolidated joint ventures	(184,481)		(184,518)		(88,872)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	140,569		141,742		770,604
Net proceeds from disposition of real estate/joint venture interest	557,611		626,364		651,594
Cash and restricted cash assumed from acquisition of real estate investment	—		60,494		—
Cash assumed from consolidation of real estate investment	—		—		9,475
Proceeds from sale or redemption of marketable securities	—		15,626		4,528
Purchases of marketable securities	—		—		(10,000)
Other investments	(17,334)		1,432		40,200
Origination of debt and preferred equity investments	(65,357)		(51,367)		(95,695)
Repayments or redemption of debt and preferred equity investments	—		181,293		167,024
Net cash provided by investing activities	171,345		425,805		993,581
Financing Activities
Proceeds from mortgages and other loans payable	$	—	$	381,980	$	39,689
Repayments of mortgages and other loans payable	(25,826)		(292,364)		(375,044)
Proceeds from revolving credit facility, term loans and senior unsecured notes	538,000		1,524,000		1,488,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(828,000)		(1,864,000)		(1,808,000)
Proceeds from stock options exercised and DRSPP issuance	525		525		1,556

64

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(in thousands, except per share data)

	Year Ended December 31,
	2023		2022		2021
Repurchase of common stock	—		(151,197)		(341,403)
Redemption of preferred stock	(11,700)		(17,967)		(6,040)
Redemption of OP units	(9,076)		(40,901)		(25,703)
Distributions to noncontrolling interests in other partnerships	(2,777)		(4,699)		(6,631)
Contributions from noncontrolling interests in other partnerships	6,932		52,164		336
Acquisition of subsidiary interest from noncontrolling interest	—		(29,817)		—
Distributions to noncontrolling interests in the Operating Partnership	(14,779)		(16,272)		(15,749)
Dividends paid on common and preferred stock	(230,931)		(262,136)		(271,075)
Other obligation related to secured borrowing	129,656		77,874		51,862
Tax withholdings related to restricted share awards	—		(3,915)		(2,990)
Deferred loan costs	(1,407)		(8,098)		(13,745)
Principal payments on financing lease liabilities	—		—		(434)
Net cash used in financing activities	(449,383)		(654,823)		(1,285,371)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(48,535)		47,070		(35,811)
Cash, cash equivalents, and restricted cash at beginning of year	384,054		336,984		372,795
Cash, cash equivalents, and restricted cash at end of period	$	335,519	$	384,054	$	336,984
Supplemental cash flow disclosures:
Interest paid	$	229,119	$	169,519	$	152,773
Income taxes paid	$	7,815	$	5,358	$	4,405
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Redemption of units in the Operating Partnership for a joint venture sale	$	—	$	—	$	27,586
Exchange of preferred equity investment for real estate or equity in joint venture	—		190,652		—
Exchange of debt investment for real estate or equity in joint venture	349,946		193,995		9,468
Assumption of mortgage and mezzanine loans	—		1,712,750		60,000
Issuance of special dividend paid in stock	—		160,620		121,418
Tenant improvements and capital expenditures payable	—		18,518		7,580
Fair value adjustment to noncontrolling interest in the Operating Partnership	15,486		39,974		9,851
Investment in joint venture	—		47,135		—
Deconsolidation of a subsidiary	101,351		—		66,837
Deconsolidation of subsidiary debt	1,712,750		—		510,000
Debt and preferred equity investments	—		302		8,372
Transfer of assets related to assets held for sale	—		—		140,855
Transfer of liabilities related to assets held for sale	—		—		64,120
Extinguishment of debt in connection with property dispositions	—		—		53,548
Consolidation of real estate investment	—		—		119,444
Removal of fully depreciated commercial real estate properties	16,313		30,359		19,831
Sale of interest in partially owned entity	—		—		4,476
Contribution to consolidated joint venture by noncontrolling interest	8,134		—		—
Distributions to noncontrolling interests	—		—		358
Share repurchase or redemption payable	9,513		—		—
Recognition of right of use assets and related lease liabilities	—		57,938		537,344

65

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(in thousands, except per share data)

In December 2023, the Company declared a regular monthly distribution per share of $0.2500 that was paid in cash. This distribution was paid in January 2024. In December 2022, the Company declared a regular monthly distribution per share of $0.2708 that was paid in cash. This distribution was paid in January 2023. In December 2021, the Company declared a regular monthly distribution per share of $0.3108 that was paid in cash and a special distribution per share of $2.4392 that was paid entirely in stock. These distributions were paid in January 2022.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows.

	Year Ended
	2023		2022		2021
Cash and cash equivalents	$	221,823	$	203,273	$	251,417
Restricted cash	113,696		180,781		85,567
Total cash, cash equivalents, and restricted cash	$	335,519	$	384,054	$	336,984

The accompanying notes are an integral part of these consolidated financial statements.

66

Report of Independent Registered Public Accounting Firm

To the Partners of SL Green Operating Partnership, L.P.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of SL Green Operating Partnership, L.P. (the Operating Partnership) as of December 31, 2023 and 2022, the related consolidated statements of operations, comprehensive (loss) income, capital and cash flows for each of the three years in the period ended December 31, 2023, and the related notes and financial statement schedule listed in the Index at Item 15(a)(2) (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Operating Partnership at December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Operating Partnership's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 23, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Operating Partnership's management. Our responsibility is to express an opinion on the Operating Partnership's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Operating 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 audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the 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 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 financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the 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.

Joint Venture Consolidation Assessment

Description of the Matter

The Operating Partnership accounted for certain investments in real estate joint ventures under the equity method of accounting and consolidated certain other investments in real estate joint ventures. At December 31, 2023, the Operating Partnership’s investments in unconsolidated joint ventures was $3.0 billion and noncontrolling interests in consolidated other partnerships was $69.6 million. As discussed in Note 2 to the consolidated financial statements, for each joint venture, the Operating Partnership evaluated the rights provided to each party in the venture to assess the consolidation of the venture.

67

How We Addressed the Matter in Our Audit	Auditing management’s joint venture consolidation analyses was complex and highly judgmental due to the subjectivity in assessing which activities most significantly impact a joint venture’s economic performance based on the purpose and design of the entity over the duration of its expected life and assessing which party has rights to direct those activities. We tested the Operating Partnership’s controls over the assessment of joint venture consolidation. For example, we tested controls over management's review of the consolidation analyses for newly formed ventures as well as controls over management's identification of reconsideration events which could trigger modified consolidation conclusions for existing ventures. To test the Operating Partnership’s consolidation assessment for real estate joint ventures, our procedures included, among others, reviewing new and amended joint venture agreements and discussing with management the nature of the rights conveyed to the Operating Partnership through the joint venture agreements as well as the business purpose of the joint venture transactions. We reviewed management’s assessment of the activities that would most significantly impact the joint venture’s economic performance and evaluated whether the joint venture agreements provided participating or protective rights to the Operating Partnership. We also evaluated transactions with the joint ventures for events which would require a reconsideration of previous consolidation conclusions.
Impairment of Commercial Real Estate Properties and Investments in Unconsolidated Joint Ventures
Description of the Matter	At December 31, 2023, the Operating Partnership’s commercial real estate properties, at cost totaled approximately $5.0 billion. As described in Note 2 to the consolidated financial statements, real estate properties are periodically reviewed for impairment when circumstances indicate that the carrying value of a property may not be recoverable. For the year ended December 31, 2023, the Operating Partnership recognized $249.5 million of impairment losses on its commercial real estate properties, which is included in depreciable real estate reserves and impairments in the consolidated statements of operations. At December 31, 2023, the Operating Partnership’s investments in unconsolidated joint ventures was $3.0 billion. As described in Note 2 to the consolidated financial statements, investments in unconsolidated joint ventures are assessed for recoverability, and if it is determined that a loss in value of the investment is other than temporary, the investment is written down to its fair value. For the year ended December 31, 2023, the Operating Partnership recognized $132.9 million of other than temporary impairment losses on its investments in unconsolidated joint ventures, which is included in depreciable real estate reserves and impairments in the consolidated statements of operations.
How We Addressed the Matter in Our Audit	Auditing the Operating Partnership’s accounting for impairment of commercial real estate properties and investments in unconsolidated joint ventures was especially challenging and involved a high degree of subjectivity as a result of the assumptions and estimates inherent in the determination of estimated future cash flows and the estimated fair value of commercial real estate properties and investments in unconsolidated joint ventures. In particular, management’s assumptions and estimates included estimated revenue and expense growth rates, discount rates and capitalization rates, which were sensitive to expectations about future operations, market or economic conditions, demand and competition. We obtained an understanding, evaluated the design, and tested the operating effectiveness of controls over the Operating Partnership’s commercial real estate properties and investments in unconsolidated joint ventures impairment process. This included testing of controls over management's review of the significant assumptions and data inputs utilized in the estimation of expected future cash flows and the determination of fair value. To test the Operating Partnership's accounting for impairment of commercial real estate properties and investments in unconsolidated joint ventures, we performed audit procedures that included, among others, evaluating the methodologies applied and testing the significant assumptions discussed above and the underlying data used by the Operating Partnership in its impairment analyses. We held discussions with management about the current status of potential transactions and the Operating Partnership’s intent and ability to fund future operations of investments in unconsolidated joint ventures. We also discussed management’s judgments to understand the probability of future events that could affect the holding period and other cash flow assumptions for the properties. In certain cases, we involved our valuation specialists to assist in performing these procedures. We compared the significant assumptions used by management to historical data and observable market-specific data. We also assessed management’s estimates and performed sensitivity analyses of significant assumptions to evaluate the changes in estimated future cash flows that would result from changes in the assumptions. In addition, we assessed information and events subsequent to the balance sheet date to corroborate certain of the key assumptions utilized by management.

68

/s/ Ernst & Young LLP

We have served as the Operating Partnership's auditor since 2010.

New York, New York

February 23, 2024

69

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands, except per unit data)

	December 31, 2023		December 31, 2022
Assets
Commercial real estate properties, at cost:
Land and land interests	$	1,092,671	$	1,576,927
Building and improvements	3,655,624		4,903,776
Building leasehold and improvements	1,354,569		1,691,831
Right of use asset - operating leases	953,236		1,026,265
	7,056,100		9,198,799
Less: accumulated depreciation	(2,035,311)		(2,039,554)
	5,020,789		7,159,245
Cash and cash equivalents	221,823		203,273
Restricted cash	113,696		180,781
Investments in marketable securities	9,591		11,240
Tenant and other receivables	33,270		34,497
Related party receivables	12,168		27,352
Deferred rents receivable	264,653		257,887
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,630 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively	346,745		623,280
Investments in unconsolidated joint ventures	2,983,313		3,190,137
Deferred costs, net	111,463		121,157
Other assets	413,670		546,945
Total assets (1)	$	9,531,181	$	12,355,794
Liabilities
Mortgages and other loans payable, net	$	1,491,319	$	3,227,563
Revolving credit facility, net	554,752		443,217
Unsecured term loans, net	1,244,881		1,641,552
Unsecured notes, net	99,795		99,692
Accrued interest payable	17,930		14,227
Other liabilities	471,401		236,211
Accounts payable and accrued expenses	153,164		154,867
Deferred revenue	134,053		272,248
Lease liability - financing leases	105,531		104,218
Lease liability - operating leases	827,692		895,100
Dividend and distributions payable	20,280		21,569
Security deposits	49,906		50,472
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000		100,000
Total liabilities (1)	5,270,704		7,260,936
Commitments and contingencies
Limited partner interests in SLGOP (3,949 and 3,670 limited partner common units outstanding at December 31, 2023 and 2022, respectively)	238,051		269,993
Preferred units	166,501		177,943

70

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands, except per unit data)

	December 31, 2023		December 31, 2022
Capital
SLGOP partners' capital:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2023 and 2022	221,932		221,932
SL Green partners' capital (687 and 680 general partner common units, and 64,039 and 63,700 limited partner common units outstanding at December 31, 2023 and 2022, respectively)	3,546,906		4,313,497
Accumulated other comprehensive income	17,477		49,604
Total SLGOP partners' capital	3,786,315		4,585,033
Noncontrolling interests in other partnerships	69,610		61,889
Total capital	3,855,925		4,646,922
Total liabilities and capital	$	9,531,181	$	12,355,794
(1) The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

The accompanying notes are an integral part of these consolidated financial statements.

71

SL Green Operating Partnership, L.P.

Consolidated Statements of Operations

(in thousands, except per unit data)

	Year Ended December 31,
	2023		2022		2021
Revenues
Rental revenue, net	$	683,335	$	671,500	$	678,176
SUMMIT Operator revenue	118,260		89,048		16,311
Investment income	34,705		81,113		80,340
Other income	77,410		77,793		86,483
Total revenues	913,710		919,454		861,310
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	196,696		174,063		167,153
Real estate taxes	143,757		138,228		152,835
Operating lease rent	27,292		26,943		26,554
SUMMIT Operator expenses	101,211		89,207		16,219
Interest expense, net of interest income	137,114		89,473		70,891
Amortization of deferred financing costs	7,837		7,817		11,424
SUMMIT Operator tax expense	9,201		2,647		1,000
Depreciation and amortization	247,810		216,167		216,969
Loan loss and other investment reserves, net of recoveries	6,890		—		2,931
Transaction related costs	1,099		409		3,773
Marketing, general and administrative	111,389		93,798		94,912
Total expenses	990,296		838,752		764,661
Equity in net loss from unconsolidated joint ventures	(76,509)		(57,958)		(55,402)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)		(131)		(32,757)
Purchase price and other fair value adjustments	(17,260)		(8,118)		210,070
(Loss) gain on sale of real estate, net	(32,370)		(84,485)		287,417
Depreciable real estate reserves and impairments	(382,374)		(6,313)		(23,794)
Loss on early extinguishment of debt	(870)		—		(1,551)
Net (loss) income	(599,337)		(76,303)		480,632
Net loss (income) attributable to noncontrolling interests in other partnerships	4,568		(1,122)		1,884
Preferred units distributions	(7,255)		(6,443)		(7,305)
Net (loss) income attributable to SLGOP	(602,024)		(83,868)		475,211
Perpetual preferred unit dividends	(14,950)		(14,950)		(14,950)
Net (loss) income attributable to SLGOP common unitholders	$	(616,974)	$	(98,818)	$	460,261
Basic (loss) earnings per unit	$	(9.12)	$	(1.49)	$	6.57
Diluted (loss) earnings per unit	$	(9.12)	$	(1.49)	$	6.50
Basic weighted average common units outstanding	67,972		67,929		69,727
Diluted weighted average common units and common unit equivalents outstanding	67,972		67,929		70,769

The accompanying notes are an integral part of these consolidated financial statements.

72

SL Green Operating Partnership, L.P.

Consolidated Statements of Comprehensive (Loss) Income

(in thousands)

	Year Ended December 31,
	2023		2022		2021
Net (loss) income	$	(599,337)	$	(76,303)	$	480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)		103,629		21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)		(1,440)		104
Other comprehensive (loss) income	(34,087)		102,189		21,531
Comprehensive (loss) income	(633,424)		25,886		502,163
Net loss (income) attributable to noncontrolling interests	4,568		(1,122)		1,884
Other comprehensive loss (income) attributable to noncontrolling interests	1,960		(5,827)		(1,042)
Comprehensive (loss) income attributable to SLGOP	$	(626,896)	$	18,937	$	503,005

The accompanying notes are an integral part of these consolidated financial statements.

73

SL Green Operating Partnership, L.P.

Consolidated Statements of Capital

(in thousands, except per unit data)

	SL Green Operating Partnership Unitholders
			Partners' Interest
	Series I Preferred Units		Common Units	Common Unitholders		Accumulated Other Comprehensive (Loss) Income		Noncontrolling Interests		Total
Balance at December 31, 2020	$	221,932	66,474	$	4,755,078	$	(67,247)	$	26,032	$	4,935,795
Net income				449,754				(1,884)		447,870
Other comprehensive income						20,489				20,489
Perpetual preferred unit dividends				(14,950)						(14,950)
DRSPP proceeds			11	738						738
Reallocation of noncontrolling interests in the Operating Partnership				(9,851)						(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings			108	32,583						32,583
Repurchases of common units			(4,474)	(337,624)						(337,624)
Proceeds from stock options exercised			12	818						818
Contributions to consolidated joint venture interests								336		336
Sale of interest in partially owned entity								(4,476)		(4,476)
Cash distributions to noncontrolling interests								(6,631)		(6,631)
Issuance of special distribution paid in units			1,974	123,529						123,529
Cash distributions declared ($6.2729 per common unit, none of which represented a return of capital for federal income tax purposes)				(410,373)						(410,373)
Balance at December 31, 2021	$	221,932	64,105	$	4,589,702	$	(46,758)	$	13,377	$	4,778,253
Net loss				(78,074)				1,122		(76,952)
Acquisition of subsidiary interest from noncontrolling interest				(29,742)				(75)		(29,817)
Other comprehensive income						96,362				96,362
Perpetual preferred unit dividends				(14,950)						(14,950)
DRSPP proceeds			11	525						525
Reallocation of noncontrolling interest in the Operating Partnership				39,974						39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings			274	32,034						32,034
Repurchases of common units			(1,971)	(151,197)						(151,197)
Contributions to consolidated joint venture interests								52,164		52,164
Cash distributions to noncontrolling interests								(4,699)		(4,699)
Issuance of special distribution paid in units			1,961	160,620						160,620
Cash distributions declared ($3.6896 per common unit, none of which represented a return of capital for federal income tax purposes)				(235,395)						(235,395)
Balance at December 31, 2022	$	221,932	64,380	$	4,313,497	$	49,604	$	61,889	$	4,646,922
Net loss				(564,559)				(4,568)		(569,127)
Other comprehensive loss						(32,127)				(32,127)
Perpetual preferred unit dividends				(14,950)						(14,950)
DRSPP proceeds			17	525						525
Reallocation of noncontrolling interest in the Operating Partnership				(15,486)						(15,486)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings			329	35,573						35,573
Contributions to consolidated joint venture interests								15,066		15,066
Cash distributions to noncontrolling interests								(2,777)		(2,777)
Cash distributions declared ($3.2288 per common unit, none of which represented a return of capital for federal income tax purposes)				(207,694)						(207,694)
Balance at December 31, 2023	$	221,932	64,726	$	3,546,906	$	17,477	$	69,610	$	3,855,925

The accompanying notes are an integral part of these consolidated financial statements.

74

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(in thousands)

	Year Ended December 31,
	2023		2022		2021
Operating Activities
Net (loss) income	$	(599,337)	$	(76,303)	$	480,632
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	255,647		223,984		228,393
Equity in net loss from unconsolidated joint ventures	76,509		57,958		55,402
Distributions of cumulative earnings from unconsolidated joint ventures	9,897		780		824
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	13,368		131		32,757
Purchase price and other fair value adjustments	17,260		8,118		(210,070)
Depreciable real estate reserves and impairments	382,374		6,313		23,794
Loss (gain) on sale of real estate, net	32,370		84,485		(287,417)
Loan loss reserves and other investment reserves, net of recoveries	6,890		—		2,931
Loss on early extinguishment of debt	870		—		1,551
Deferred rents receivable	(17,903)		(5,749)		(6,701)
Non-cash lease expense	20,435		22,403		17,234
Other non-cash adjustments	28,174		(5,676)		37,164
Changes in operating assets and liabilities:
Tenant and other receivables	(1,725)		14,370		(20,561)
Related party receivables	15,788		6,666		(8,727)
Deferred lease costs	(17,427)		(21,792)		(10,117)
Other assets	(1,922)		(28,204)		20,245
Accounts payable, accrued expenses, other liabilities and security deposits	11,974		(30,839)		(66,387)
Deferred revenue	8,057		18,332		(1,727)
Change in lease liability - operating leases	(11,796)		1,111		(33,241)
Net cash provided by operating activities	229,503		276,088		255,979
Investing Activities
Acquisitions of real estate property	$	—	$	(64,491)	$	(152,791)
Additions to land, buildings and improvements	(259,663)		(300,770)		(302,486)
Investments in unconsolidated joint ventures	(184,481)		(184,518)		(88,872)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	140,569		141,742		770,604
Net proceeds from disposition of real estate/joint venture interest	557,611		626,364		651,594
Cash and restricted cash assumed from acquisition of real estate investment	—		60,494		—
Cash assumed from consolidation of real estate investment	—		—		9,475
Proceeds from sale or redemption of marketable securities	—		15,626		4,528
Purchases of marketable securities	—		—		(10,000)
Other investments	(17,334)		1,432		40,200
Origination of debt and preferred equity investments	(65,357)		(51,367)		(95,695)
Repayments or redemption of debt and preferred equity investments	—		181,293		167,024
Net cash provided by investing activities	171,345		425,805		993,581
Financing Activities
Proceeds from mortgages and other loans payable	$	—	$	381,980	$	39,689
Repayments of mortgages and other loans payable	(25,826)		(292,364)		(375,044)
Proceeds from revolving credit facility, term loans and senior unsecured notes	538,000		1,524,000		1,488,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(828,000)		(1,864,000)		(1,808,000)

75

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(in thousands)

	Year Ended December 31,
	2023		2022		2021
Proceeds from stock options exercised and DRSPP issuance	525		525		1,556
Repurchase of common units	—		(151,197)		(341,403)
Redemption of preferred units	(11,700)		(17,967)		(6,040)
Redemption of OP units	(9,076)		(40,901)		(25,703)
Distributions to noncontrolling interests in other partnerships	(2,777)		(4,699)		(6,631)
Contributions from noncontrolling interests in other partnerships	6,932		52,164		336
Acquisition of subsidiary interest from noncontrolling interest	—		(29,817)		—
Distributions paid on common and preferred units	(245,710)		(278,408)		(286,824)
Other obligation related to secured borrowing	129,656		77,874		51,862
Tax withholdings related to restricted share awards	—		(3,915)		(2,990)
Deferred loan costs	(1,407)		(8,098)		(13,745)
Principal payments on financing lease liabilities	—		—		(434)
Net cash used in financing activities	(449,383)		(654,823)		(1,285,371)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(48,535)		47,070		(35,811)
Cash, cash equivalents, and restricted cash at beginning of year	384,054		336,984		372,795
Cash, cash equivalents, and restricted cash at end of period	$	335,519	$	384,054	$	336,984
Supplemental cash flow disclosures:
Interest paid	$	229,119	$	169,519	$	152,773
Income taxes paid	$	7,815	$	5,358	$	4,405
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Redemption of units in the Operating Partnership for a joint venture sale	$	—	$	—	$	27,586
Exchange of preferred equity investment for real estate or equity in joint venture	—		190,652		—
Exchange of debt investment for real estate or equity in joint venture	349,946		193,995		9,468
Assumption of mortgage and mezzanine loans	—		1,712,750		60,000
Issuance of special distribution paid in units	—		160,620		121,418
Tenant improvements and capital expenditures payable	—		18,518		7,580
Fair value adjustment to noncontrolling interest in the Operating Partnership	15,486		39,974		9,851
Investment in joint venture	—		47,135		—
Deconsolidation of a subsidiary	101,351		—		66,837
Deconsolidation of subsidiary debt	1,712,750		—		510,000
Debt and preferred equity investments	—		302		8,372
Transfer of assets related to assets held for sale	—		—		140,855
Transfer of liabilities related to assets held for sale	—		—		64,120
Extinguishment of debt in connection with property dispositions	—		—		53,548
Consolidation of real estate investment	—		—		119,444
Removal of fully depreciated commercial real estate properties	16,313		30,359		19,831
Sale of interest in partially owned entity	—		—		4,476
Contribution to consolidated joint venture by noncontrolling interest	8,134		—		—
Distributions to noncontrolling interests	—		—		358
Share repurchase or redemption payable	9,513		—		—
Recognition of right of use assets and related lease liabilities	—		57,938		537,344

76

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(in thousands)

In December 2023, the Company declared a regular monthly distribution per share of $0.2500 that was paid in cash. This distribution was paid in January 2024. In December 2022, the Company declared a regular monthly distribution per share of $0.2708 that was paid in cash. This distribution was paid in January 2023. In December 2021, the Company declared a regular monthly distribution per share of $0.3108 that was paid in cash and a special distribution per share of $2.4392 that was paid entirely in stock. These distributions were paid in January 2022.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows.

	Year Ended
	2023		2022		2021
Cash and cash equivalents	$	221,823	$	203,273	$	251,417
Restricted cash	113,696		180,781		85,567
Total cash, cash equivalents, and restricted cash	$	335,519	$	384,054	$	336,984

The accompanying notes are an integral part of these consolidated financial statements.

77

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements

December 31, 2023

1. Organization and Basis of Presentation

SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as S.L. Green Management Corp, or the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC and S.L. Green Management Corp., respectively, which are 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of December 31, 2023, noncontrolling investors held, in the aggregate, a 5.75% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements."

On December 31, 2023, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Buildings		Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings		Approximate Square Feet (unaudited)		Weighted Average Leased Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	13	(2)	8,399,141	12	15,412,174	25	(2)	23,811,315	(2)	89.4	%
	Retail	3	(2)	40,536	7	281,796	10	(2)	322,332	(2)	91.2	%
	Development/Redevelopment	3	(3)	1,443,771	3	2,893,357	6	(2)	4,337,128	(2)	N/A
		19		9,883,448	22	18,587,327	41		28,470,775		89.5	%
Suburban	Office	7		862,800	—	—	7		862,800		77.1	%
Total commercial properties		26		10,746,248	22	18,587,327	48		29,333,575		89.0	%
Residential:
Manhattan	Residential	1	(3)	140,382	1	221,884	2		362,266		99.0	%
Total portfolio		27		10,886,630	23	18,809,211	50		29,695,841		89.2	%

(1)The weighted average leased occupancy for commercial properties represents the total leased square footage divided by the total square footage at acquisition.  The weighted average leased for residential properties represents the total leased units divided by the total available units. Properties under construction are not included in the calculation of weighted average leased occupancy.

(2)Includes assets within the Company's alternative strategy portfolio. Within that portfolio, office includes one building totaling 2,048,725 square feet, retail includes eight buildings totaling 286,738 square feet, and development/redevelopment includes two buildings totaling 1,496,931 square feet.

(3)As of December 31, 2023, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

78

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

As of December 31, 2023, we also managed one office building and one retail building owned by a third party encompassing approximately 0.4 million square feet (unaudited), and held debt and preferred equity investments with a book value of $346.7 million, excluding debt and preferred equity investments and other financing receivables totaling $7.9 million that are included in balance sheet line items other than the Debt and preferred equity investments line item.

Partnership Agreement

In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners, subject to the priority distributions with respect to preferred units and special provisions that apply to Long Term Incentive Plan ("LTIP") Units. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis.

Subsequent Events

In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest at 2 Herald for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024. See Note 6, "Investments in Unconsolidated Joint Ventures."

In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for a total consideration of $963.0 million. See Note 6, "Investments in Unconsolidated Joint Ventures."

2. Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a VIE in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income (loss) attributed to controlling and noncontrolling interests.

We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights provided to each party and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Investment in Commercial Real Estate Properties

Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.

We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their respective fair values on the acquisition date. When we acquire our partner's equity interest in an existing unconsolidated joint venture and gain control over the investment, we record the consolidated investment at fair value. The difference between the book value of our equity investment on the purchase date and our share of the fair value of the investment's purchase price is recorded as a purchase price fair value adjustment in our consolidated statements of operations. See Note 3, "Property Acquisitions."

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from 3 years to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from 1 year to 15 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from 1 year to 15 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2023, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 4.7 years, 8.1 years, and 3.1 years, respectively.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Properties other than Right of use assets - operating leases are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category	Term
Building (fee ownership)	40 years
Building improvements	shorter of remaining life of the building or useful life
Building (leasehold interest)	lesser of 40 years or remaining term of the lease
Right of use assets - financing leases	lesser of 40 years or remaining lease term
Furniture and fixtures	4 to 7 years
Tenant improvements	shorter of remaining term of the lease or useful life

Right of use assets - operating leases are amortized over the remaining lease term. The amortization is made up of the principal amortization under the lease liability plus or minus the straight-line adjustment of the operating lease rent under ASC 842.

Depreciation expense (including amortization of right of use assets - financing leases) totaled $221.0 million, $190.1 million, and $187.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

On a periodic basis, we assess whether there are any indications that the value of our real estate consolidated properties may be impaired or that their carrying value may not be recoverable. A consolidated property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also evaluate our real estate consolidated properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

In April 2023, the ground rent appraisal proceeding concluded for our wholly-owned leasehold interest at 625 Madison Avenue. As a result of that proceeding, the ground rent was reset from the previous rent of $4.61 million per annum to a new rent of $20.25 million per annum, effective as of July 1, 2022. Following a strategic review of the property that addressed a range of relevant considerations, including the increase in ground rent to an amount substantially above what the Company believed was appropriate, the Company recorded a $249.5 million charge to write down the carrying value of its investment in the leasehold interest to zero for the year ended December 31, 2023, which is included in Depreciable real estate reserves and impairments in the consolidated statement of operations.

For the years ended December 31, 2023 and 2022, we recognized $14.2 million and $5.7 million, respectively, of rental revenue for the amortization of aggregate below-market leases in excess of above-market leases resulting from the allocation of the purchase price of the applicable properties. For the year ended December 31, 2021, we recognized a reduction of rental revenue of ($4.2 million) for the amortization of aggregate above-market leases in excess of below-market leases.

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,902)		(190,066)
Net	$	4,778	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,089)		(212,191)
Net	$	3,305	$	149,147

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands):    

2024	$	36
2025	234
2026	205
2027	184
2028	70

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands):

2024	$	1,096
2025	728
2026	551
2027	312
2028	158

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of December 31, 2023, we did not have any debt securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.

As of December 31, 2023 and 2022, we held the following marketable securities (in thousands):

	December 31, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,591	$	11,240
Total investment in marketable securities	$	9,591	$	11,240

The cost basis of the commercial mortgage-backed securities was $11.5 million as of December 31, 2023 and 2022. These securities mature at various times through 2030. All securities were in an unrealized loss position as of December 31, 2023 and 2022 with an unrealized loss of $1.9 million and fair market value of $9.6 million as of December 31, 2023, and an unrealized loss of $0.3 million and a fair market value of $11.2 million as of December 31, 2022. The securities were in a continuous unrealized loss position for more than 12 months as of December 31, 2023 and less than 12 months as of December 31, 2022. We do not intend to sell our other securities, and it is more likely than not that we will not be required to sell the investment before the recovery of their amortized cost basis.

During the year ended December 31, 2023, we did not dispose of any debt marketable securities. During the year ended December 31, 2022, we received aggregate net proceeds of $7.8 million from the sale of one debt marketable security and $3.7 million from the repayment of one debt marketable security. During the year ended December 31, 2021, we received aggregate net proceeds of $4.5 million from the repayment of one debt marketable security.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

We held no equity marketable securities as of December 31, 2023 and 2022 as we sold the one equity marketable security that was held as of December 31, 2021 during the year ended December 31, 2022, for which we received aggregate net proceeds of $4.2 million. We did not dispose of any equity marketable securities during the year ended December 31, 2021. We recognized $6.5 million of realized losses and $0.6 million of unrealized gains for the years ended December 31, 2022 and 2021, respectively.

Investments in Unconsolidated Joint Ventures

We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. Unless we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans.

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired at December 31, 2023.

We may originate loans for real estate acquisition, development and construction ("ADC loans"), where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments.

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term. Certain of our employees provide leasing services to the wholly-owned properties. For the years ended December 31, 2023, 2022 and 2021, $6.8 million, $6.6 million, and $6.2 million of their compensation, respectively, was capitalized and is amortized over an estimated average lease term of seven years.

Deferred Financing Costs

Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close. Deferred financing costs related to a recognized debt liability are presented in the consolidated balance sheet as a direct deduction from the carrying amount of that debt liability.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

84

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Revenues from the sale of SUMMIT tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $2.6 million and $2.0 million, respectively, and is included in Deferred revenue on the consolidated balance sheets.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

85

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

Rent Expense

Rent expense is recognized on a straight-line basis over the initial term of the lease. The excess of the rent expense recognized over the amounts contractually due pursuant to the underlying lease is included in the lease liability - operating leases on the consolidated balance sheets.

Underwriting Commissions and Costs

Underwriting commissions and costs incurred in connection with our stock offerings are reflected as a reduction of additional paid-in-capital.

Transaction Costs

Transaction costs for real estate asset acquisitions are capitalized to the investment basis, which is then subject to a purchase price allocation based on relative fair value. Transaction costs for business combinations or costs incurred on potential transactions that are not consummated are expensed as incurred.

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on its taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on its undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

We have elected, and may elect in the future, to treat certain of our corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal, state and local corporate tax liability for these entities. SUMMIT is held in a TRS and pays Federal, state and local taxes. During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax expense for SUMMIT of $9.2 million, $2.6 million, and $1.0 million, respectively.

During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax provisions of $8.2 million, $3.7 million, and $2.8 million, respectively. For the year ended December 31, 2023, the Company paid distributions on its common stock of $3.25 per share which represented $0.00 per share of ordinary income and $3.25 per share of capital gains. For the year ended December 31, 2022, the Company paid distributions on its common stock of $6.17 per share which represented $2.56 per share of ordinary income, and $1.17 per share of capital gains. For the year ended December 31, 2021, the Company paid distributions on its common stock of $8.09 per share which represented $0.50 per share of ordinary income and $5.92 per share of capital gains.

86

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Stock Based Employee Compensation Plans

We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation."

For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of our Board of Directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable award date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.

The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options.

Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on either the grant date or the date immediately preceding the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date.

Derivative Instruments

In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify for hedge accounting. Some derivative instruments are associated with an anticipated transaction. In those cases, hedge effectiveness criteria also require that it be probable that the underlying transaction occurs. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract.

To determine the fair values of derivative instruments, we use a variety of methods and assumptions that are based on market conditions and risks existing at each balance sheet date. For the majority of financial instruments including most derivatives, long-term investments and long-term debt, standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost, and termination cost are used to determine fair value. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized.

87

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

In the normal course of business, we are exposed to the effect of interest rate changes and limit these risks by following established risk management policies and procedures including the use of derivatives. To address exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices and manage the cost of borrowing obligations.

We use a variety of conventional derivative products. These derivatives include, but are not limited to, interest rate swaps, caps, collars and floors. We expressly prohibit the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors.

We may employ swaps, forwards or purchased options to hedge qualifying forecasted transactions. Gains and losses related to these transactions are deferred and recognized in net income as interest expense in the same period or periods that the underlying transaction occurs, expires or is otherwise terminated.

Hedges that are reported at fair value and presented on the balance sheet could be characterized as cash flow hedges or fair value hedges. Interest rate caps and collars are examples of cash flow hedges. Cash flow hedges address the risk associated with future cash flows of interest payments. For all hedges held by us that meet the hedging objectives established by our corporate policy governing interest rate risk management, no net gains or losses were reported in earnings. The changes in fair value of derivative instruments designated as hedge instruments are reflected in accumulated other comprehensive income. For derivative instruments not designated as hedging instruments, the gain or loss, resulting from the change in the estimated fair value of the derivative instruments, is recognized in current earnings during the period of change.

Earnings per Share of the Company

The Company presents both basic and diluted earnings per share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method.

Earnings per Unit of the Operating Partnership

The Operating Partnership presents both basic and diluted earnings per unit ("EPU") using the two-class method, which is an earnings allocation formula that determines EPU for common units and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPU is computed by dividing the income available to common unitholders by the weighted-average number of common units outstanding for the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

88

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries. Other than one tenant, Paramount Global (formerly ViacomCBS Inc.), which accounted for 5.9% of our share of annualized cash rent as of December 31, 2023, no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized cash rent, as of December 31, 2023.

For the years ended December 31, 2023, 2022, and 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	2023	Property	2022	Property	2021
One Vanderbilt Avenue	16.0%	One Vanderbilt Avenue	14.1%	11 Madison Avenue	10.8%
11 Madison Avenue	8.3%	245 Park Avenue	10.0%	420 Lexington Avenue	8.3%
420 Lexington Avenue	6.7%	11 Madison Avenue	7.8%	1515 Broadway	8.1%
1515 Broadway	6.4%	420 Lexington Avenue	6.3%	1185 Avenue of the Americas	8.0%
1185 Avenue of the Americas	5.6%	1515 Broadway	5.8%	280 Park Avenue	6.7%
280 Park Avenue	5.5%	1185 Avenue of the Americas	5.1%	919 Third Avenue	5.3%
245 Park Avenue	5.5%	280 Park Avenue	5.1%	485 Lexington Avenue	5.3%
				555 West 57th Street	5.2%

As of December 31, 2023, 57.6% of our work force is covered by five collective bargaining agreements, and 1.3% of our work force is covered by collective bargaining agreements that expire before December 31, 2024. See Note 19, "Benefits Plans."

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

As of December 31, 2023, the SUMMIT meets the criteria of a reportable operating segment pursuant to the guidance in ASC 280. Accordingly, we reclassified SUMMIT Operator revenue, SUMMIT Operator expenses, and SUMMIT Operator tax expense to separate financial statement line items in our consolidated statements of operations. These items were previously presented on a net basis in Other income. Additionally, the depreciation and amortization of SUMMIT assets are included in Depreciation and amortization in our consolidated statements of operations. Prior period balances have been reclassified to conform to the current period presentation.

Accounting Standards Updates

In December 2023, the FASB issued ASU No. 2023-09 Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The objective of the amendments in ASU 2023-09 related to the rate reconciliation and income taxes paid disclosures are to improve transparency of income tax disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, and income taxes paid disaggregated by jurisdiction. The amendment will require that public entities on an annual basis disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. Additionally, the amendment will require that all entities disclose on an annual basis the amount of taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes as well as disaggregated by individual jurisdictions that meet a quantitative threshold. ASU 2023-09 is effective prospectively for annual periods beginning after December 15, 2024. Early adoption and retrospective application is permitted. We are currently evaluating the impact of the adoption of ASU 2023-09 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

89

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

In November 2023, the FASB issued ASU No. 2023-07 Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. ASU 2023-07 amends the reportable segment disclosure requirements to enhance disclosures about significant segment expenses. The objective of the amendment is to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. The amendment will require that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss (collectively referred to as the "significant expense principle"). Additionally, the amendment will require an entity to disclose an amount for "other segment items" by reportable segment and a description of its composition as well as require annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 in interim periods. Lastly, the amendment will require a public entity to disclose the title and position of the CODM and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding to allocate resources. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted and should be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating the impact of the adoption of ASU 2023-07 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. We are currently evaluating the impact of the adoption of ASU 2023-05 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements.

In July 2021, the FASB issued ASU No. 2021-05 Leases (Topic 842) Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 amends the lease classification requirements for lessors when classifying and accounting for a lease with variable lease payments that do not depend on a reference rate index or a rate. The update provides criteria, that if met, the lease would be classified and accounted for as an operating lease. ASU 2021-05 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

90

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2024, which was extended from the original sunset date of December 31, 2022 when the FASB issued ASU No. 2022-06 in December 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the 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. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The impact of this guidance did not have a material impact on the Company's consolidated financial statements.

3. Property Acquisitions

2023 Acquisitions

During the year ended December 31, 2023, we did not acquire any properties from a third party.

2022 Acquisitions

The following table summarizes the properties acquired during the year ended December 31, 2022:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
245 Park Avenue (1)	September 2022	Fee Interest	1,782,793	$	1,960.0

(1)On October 31, 2021, HNA, through an affiliated entity, filed for Chapter 11 bankruptcy protection on account of its investment in 245 Park Avenue, together with another asset in Chicago. On July 8, 2022, certain of the debtors and affiliates of SL Green entered into a Plan Sponsorship and Investment Agreement (the "Plan"). Since the debtors did not receive any qualifying bids for the property and the Plan was confirmed, SL Green acquired full ownership and control of the property in September 2022, at which time our outstanding preferred equity and accrued interest balance were credited to our equity investment in the property. We recorded the assets acquired and liabilities assumed at fair value. See Note 16, "Fair Value Measurements."

2021 Acquisitions

The following table summarizes the properties acquired during the year ended December 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9
461 Fifth Avenue (2)	June 2021	Fee Interest	200,000	28.0
1591-1597 Broadway	September 2021	Fee Interest	7,684	121.0
690 Madison Avenue (3)	September 2021	Fee Interest	7,848	72.2

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures."

(2)In April 2021, the Company exercised its option to acquire the fee interest in the property from the ground lessor and the Company acquired the fee interest in June 2021. The Company held the leasehold interest in the property prior to exercising its option.

(3)In September 2021, the Company was the successful bidder for the fee interest in 690 Madison Avenue at the foreclosure of the asset. The property previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value.

91

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

4. Properties Held for Sale and Property Dispositions

Properties Held for Sale

As of December 31, 2023 and 2022, no properties were classified as held for sale.

Property Dispositions

The following table summarizes the properties sold during the years ended December 31, 2023, 2022, and 2021:

Property	Disposition Date	Property Type	Unaudited Approximate Usable Square Feet	Sales Price (1) (in millions)		(Loss) Gain on Sale (2) (in millions)
245 Park Avenue (3)	June 2023	Fee Interest	1,782,793	$	1,995.0	$	(28.3)
885 Third Avenue - Office Condominium Units (4)	December 2022	Fee / Leasehold Interest	414,317	300.4		(24.0)
609 Fifth Avenue	June 2022	Fee Interest	138,563	100.5		(80.2)
1591-1597 Broadway	May 2022	Fee Interest	7,684	121.0		(4.5)
1080 Amsterdam Avenue	April 2022	Leasehold Interest	85,250	42.7		17.9
707 Eleventh Avenue	February 2022	Fee Interest	159,720	95.0		(0.8)
110 East 42nd Street	December 2021	Fee Interest	215,400	117.1		3.6
590 Fifth Avenue	October 2021	Fee Interest	103,300	103.0		(3.2)
220 East 42nd Street (5)	July 2021	Fee Interest	1,135,000	783.5		175.1
635-641 Sixth Avenue	June 2021	Fee Interest	267,000	325.0		99.4
106 Spring Street (6)	March 2021	Fee Interest	5,928	35.0		(2.8)
133 Greene Street (6)	February 2021	Fee Interest	6,425	15.8		0.2
712 Madison Avenue (7)	January 2021	Fee Interest	6,600	43.0		(1.4)

(1)Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2)The (losses) gains on sale are net of $11.3 million, $11.2 million, and $13.7 million of employee compensation accrued in connection with the realization of the investment dispositions during the years ended December 31, 2023, 2022, and 2021, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) that is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture" and Note 16, " Fair Value Measurements."

(4)In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

(5)In July 2021, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million, which is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Ventures."

(6)In March 2021, the property was foreclosed by the lender.

(7)Disposition resulted from the ground lessee exercising its purchase option under a ground lease arrangement.

92

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

5. Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023			December 31, 2022
Balance at beginning of year (1)	$	623,280		$	1,088,723
Debt investment originations/fundings/accretion (2)	72,160			62,992
Preferred equity investment originations/accretion (2)	8,142			37,505
Redemptions/sales/syndications/equity ownership/amortization	(349,947)			(565,940)
Net change in loan loss reserves	(6,890)			—
Balance at end of period (1)	$	346,745	(3)	$	623,280

(1)Net of unamortized fees, discounts, and premiums.

(2)Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

Below is a summary of our debt and preferred equity investments as of December 31, 2023 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value			Senior Financing		Maturity(1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Mezzanine Debt	$	168,745	$	168,912	S + 4.95 - 12.38%	$	50,000	$	50,000	8.00 - 8.40%	$	218,745	(2)	$	1,071,858	2024 - 2029
Preferred Equity	—		—		—	128,000		128,000		6.5%	128,000			250,000		2027
Balance at end of period	$	168,745	$	168,912		$	178,000	$	178,000		$	346,745		$	1,321,858

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

(2)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

The following table is a roll forward of our total allowance for loan losses for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
	2023			2022		2021
Balance at beginning of year	$	6,630		$	6,630	$	13,213
Current period provision for loan loss	6,890			—		—
Write-offs charged against the allowance	—			—		(6,583)
Balance at end of period	$	13,520	(1)	$	6,630	$	6,630

(1)As of December 31, 2023, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $49.8 million, which is included in the Company's alternative strategy portfolio.

As of December 31, 2023, two investments with a total carrying value, net of reserves, of $49.8 million were not performing in accordance with their respective terms. As of December 31, 2022, one investment with a carrying value, net of reserves, of $6.9 million was not performing in accordance with its respective terms. This is further discussed in the Debt Investments and Preferred Equity Investments tables below.

No other financing receivables were 90 days past due as of December 31, 2023 and December 31, 2022.

93

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2023 and 2022 (dollars in thousands):

Risk Rating	December 31, 2023			December 31, 2022
1 - Low Risk Assets - Low probability of loss	$	210,333		$	264,069
2 - Watch List Assets - Higher potential for loss	136,412		(1)	352,321
3 - High Risk Assets - Loss more likely than not	—			6,890
	$	346,745		$	623,280

(1)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of December 31, 2023 (dollars in thousands):

	As of December 31,
Risk Rating	2023(1)		2022(1)		2021(1)		Prior(1)(2)			Total
1 - Low Risk Assets - Low probability of loss	$	—	$	—	$	—	$	210,333		$	210,333
2 - Watch List Assets - Higher potential for loss	—		—		—		136,412		(3)	136,412
3 - High Risk Assets - Loss more likely than not	—		—		—		—			—
	$	—	$	—	$	—	$	346,745		$	346,745

(1)Year in which the investment was originated or acquired by us or in which a material modification occurred.

(2)During the year ended December 31, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

We have determined that we have one portfolio segment of financing receivables as of December 31, 2023 and 2022 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments.

Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $8.8 million and $9.0 million as of December 31, 2023 and 2022, respectively. The Company recorded no provisions for loan losses related to these financing receivables for the years ended December 31, 2023 and 2022, respectively. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms. One loan with a carrying value of $5.6 million was put on non-accrual in July 2020 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual.

94

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Debt Investments

As of December 31, 2023 and 2022, we held the following debt investments with an aggregate weighted average current yield of 8.68% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Loan Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mezzanine Loan (3) (4) (6)	$	—	$	105,000	$	13,366	$	13,366	June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Mezzanine Loan	—		—		—		225,367
Mezzanine Loan	—		—		—		77,109
Total fixed rate	$	—	$	285,000	$	63,366	$	365,842
Floating Rate Investments:
Mezzanine Loan (5) (6)	$	—	$	275,000	$	50,000	$	50,000	April 2023
Mezzanine Loan	3,761		54,000		8,243		8,243		May 2024
Mezzanine Loan	2,655		271,774		62,333		46,884		May 2024
Mezzanine Loan	10,760		186,084		48,323		39,083		January 2026
Total floating rate	$	17,176	$	786,858	$	168,899	$	144,210
Allowance for loan loss	$	—	$	—	$	(13,520)	$	(6,630)
Total	$	17,176	$	1,071,858	$	218,745	$	503,422

(1)Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2)Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing.

(3)Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting, which is included in Other assets and Other liabilities on the consolidated balance sheets.

(4)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE, in which we are not the primary beneficiary.

(5)This loan went into default and was put on non-accrual in January 2023 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower with respect to the loan.

(6)Included in the Company's alternative strategy portfolio.

Preferred Equity Investments

As of December 31, 2023 and 2022, we held the following preferred equity investments with an aggregate weighted average current yield of 6.55% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	250,000	$	128,000	$	119,858	February 2027
Total	$	—	$	250,000	$	128,000	$	119,858

(1)Carrying value is net of deferred origination fees.

(2)Represents contractual redemption, excluding any unexercised extension options.

95

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

6. Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of December 31, 2023, the book value of these investments was $3.0 billion, net of investments with negative book values totaling $149.1 million for which we have an implicit commitment to fund future capital needs.

As of December 31, 2023, 800 Third Avenue and 625 Madison Avenue are VIEs in which we are not the primary beneficiary. As of December 31, 2022, 800 Third Avenue and 21 East 66th Street are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $437.9 million as of December 31, 2023 and $86.2 million as of December 31, 2022. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies". All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting.

The table below provides general information on each of our joint ventures as of December 31, 2023:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue (2) (3)	Wharton Properties / Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street (2)	Private Investor / Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2) (4)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
650 Fifth Avenue (2) (5)	Wharton Properties	50.00%	50.00%	69,214
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
One Vanderbilt Avenue	National Pension Service of Korea / Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza (2)	RXR Realty / New York REIT	24.95%	24.95%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square (2) (6)	Israeli Institutional Investor	51.00%	51.00%	369,000
115 Spring Street (2)	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.27%	36.27%	12,946
One Madison Avenue (8)	National Pension Service of Korea / Hines Interest LP / International Investor	25.50%	25.50%	1,048,700
220 East 42nd Street	A fund managed by Meritz Alternative Investment Management	51.00%	51.00%	1,135,000
450 Park Avenue (9)	Korean Institutional Investor / Israeli Institutional Investor	50.10%	25.10%	337,000
5 Times Square (2)	RXR Realty led investment group	31.55%	31.55%	1,131,735
245 Park Avenue (10)	U.S. Affiliate of Mori Trust Co., Ltd	50.10%	50.10%	1,782,793
625 Madison Avenue (11)	Private Investor	90.43%	90.43%	563,000

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)Included in the Company's alternative strategy portfolio.

(3)In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for total consideration of $963.0 million.

(4)The joint venture owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. In December 2023, following an assessment of the investment for recoverability, the Company recorded a charge of $8.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(5)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

96

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

(6)In December 2023, following an assessment of the property and the investment for recoverability, the Company recorded a charge of $101.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at December 31, 2023 and 2022.

(9)The 50.1% ownership interest reflected in this table is comprised of our 25.1% economic interest and a 25.0% economic interest held by a third-party. The third-party's economic interest is held within a joint venture that we consolidate and recognize in Noncontrolling interests in other partnerships on our consolidated balance sheet. An additional third-party owns the remaining 49.9% economic interest in the property.

(10)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

(11)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments." In December 2023, together with its joint venture, the Company entered into a contract to sell the fee ownership in the property. In connection with this contract, the Company recorded a charge of $23.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. This transaction is expected to close in the first quarter of 2024.

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2023, 2022, and 2021:

Property	Ownership Interest Sold	Disposition Date	Gross Asset Valuation (in millions)		(Loss) Gain on Sale (in millions) (1) (2)
21 East 66th Street	32.28%	December 2023	$	40.6	$	(12.7)
121 Greene Street	50.00%	February 2023	14.0		(0.3)
Stonehenge Portfolio	Various	April 2022	1.0		—
400 East 57th Street (3)	41.00%	September 2021	133.5		(1.0)
605 West 42nd Street - Sky	20.00%	June 2021	858.1		8.9
55 West 46th Street - Tower 46	25.00%	March 2021	275.0		(15.2)
885 Third Avenue (4)	N/A	January 2021	N/A		N/A

(1)Represents the Company's share of the gain or loss

(2)For the years ended December 31, 2023 and December 31, 2021, the (losses) gains on sale are net of $2.0 million and $1.4 million, respectively, of employee compensation accrued in connection with the realization of the investment dispositions. There was no amount accrued for employee compensation in the year ended December 31, 2022. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In connection with our agreement to sell the property in April 2021, we recorded a charge of $5.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(4)In January 2021, pursuant to the partnership documents, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of December 31, 2023 and 2022, respectively, are as follows (dollars in thousands):

97

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

							Principal Outstanding				Principal Outstanding
	Economic		Current Maturity	Final Maturity	Interest		December 31, 2023				December 31, 2022
Property	Interest (1)		Date	Date (2)	Rate (3)		Gross		SLG Share		Gross		SLG Share
Fixed Rate Debt:
717 Fifth Avenue (4)(5)	10.92	%	July 2022 (5)	July 2022 (5)		5.02%	$	655,328	$	71,536	$	655,328	$	71,536
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)		5.45%	65,000		32,500		65,000		32,500
220 East 42nd Street	51.00	%	June 2024	June 2025		5.86%	505,412		257,760		510,000		260,100
5 Times Square (4)	31.55	%	September 2024	September 2026		7.13%	477,783		150,740		400,000		126,200
10 East 53rd Street	55.00	%	February 2025	February 2025		5.45%	220,000		121,000		220,000		121,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93%	762,002		433,344		782,321		444,898
115 Spring Street (4)	51.00	%	March 2025	March 2025		5.50%	65,550		33,431		—		—
450 Park Avenue	25.10	%	June 2025	June 2027		6.10%	271,394		68,120		267,000		67,017
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84%	1,400,000		840,000		1,400,000		840,000
One Madison Avenue (7)	25.50	%	November 2025	November 2026		3.59%	733,103		186,941		467,008		119,087
800 Third Avenue	60.52	%	February 2026	February 2026		3.37%	177,000		107,120		177,000		107,120
919 Third Avenue	51.00	%	April 2026	April 2028		6.11%	500,000		255,000		500,000		255,000
625 Madison Avenue (8)	90.43	%	December 2026	December 2026		5.11%	199,987		180,848		—		—
245 Park Avenue	50.10	%	June 2027	June 2027		4.30%	1,768,000		885,768		—		—
Worldwide Plaza (4)	24.95	%	November 2027	November 2027		3.98%	1,200,000		299,400		1,200,000		299,400
One Vanderbilt Avenue	71.01	%	July 2031	July 2031		2.95%	3,000,000		2,130,300		3,000,000		2,130,300
280 Park Avenue							—		—		1,200,000		600,000
21 East 66th Street							—		—		12,000		3,874
Total fixed rate debt							$	12,000,559	$	6,053,808	$	10,855,657	$	5,478,032
Floating Rate Debt:
11 West 34th Street (4)	30.00	%	February 2023 (9)	February 2023 (9)	L+	1.45%	$	23,000	$	6,900	$	23,000	$	6,900
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)	S+	2.25%	210,000		105,000		210,000		105,000
2 Herald Square (4)(10)	51.00	%	November 2023(10)	November 2023(10)	S+	2.06%	182,500		93,075		182,500		93,075
100 Park Avenue	49.90	%	January 2024 (11)	December 2025	S+	2.36%	360,000		179,640		360,000		179,640
15 Beekman (12)	20.00	%	January 2024 (13)	July 2025	S+	1.61%	124,137		24,827		86,738		17,348
1552 Broadway (4)	50.00	%	February 2024	February 2024	S+	2.75%	193,133		96,567		193,132		96,566
5 Times Square (4)	31.55	%	September 2024	September 2026	S+	5.65%	610,010		192,458		495,924		156,464
280 Park Avenue	50.00	%	September 2024	September 2024	S+	2.03%	1,200,000		600,000		—		—
21 East 66th Street							—		—		586		188
115 Spring Street							—		—		65,550		33,431
121 Greene Street							—		—		12,550		6,275
Total floating rate debt							$	2,902,780	$	1,298,467	$	1,629,980	$	694,887
Total joint venture mortgages and other loans payable							$	14,903,339	$	7,352,275	$	12,485,637	$	6,172,919
Deferred financing costs, net							(104,062)		(54,865)		(136,683)		(66,910)
Total joint venture mortgages and other loans payable, net							$	14,799,277	$	7,297,410	$	12,348,954	$	6,106,009

(1)Economic interest represents the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property.

(3)Interest rates as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S").

(4)Included in the Company's alternative strategy portfolio.

(5)The asset was sold and associated debt repaid in January 2024.

(6)In January 2024, the maturity date of the loan was extended by two months to March 2024.

98

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

(7)The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. In July 2023, the facility was modified, which will allow the partnership to utilize the final tranche of the facility for an expanded range of uses, including additional amenities funded by construction cost savings and for hedging activities in contemplation of a permanent financing.

(8)Represents $168.9 million of loan principal and $31.1 million of accrued interest.

(9)The Company's joint venture partner is in discussions with the lender on resolution of the past maturity.

(10)The Company closed on the acquisition of additional interests in the joint venture in January 2024, which increased the Company's interest to 95%. In addition, the joint venture entered into an agreement to satisfy the existing mortgage for a net payment of $7.0 million, which closed in February 2024.

(11)The Company is in discussions with the lender to exercise the available extension option.

(12)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(13)In January 2024, the maturity date of the loan was extended to July 2024.

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $21.1 million, $24.0 million and $19.6 million from these services, net of our ownership share of the joint ventures, for the years ended December 31, 2023, 2022, and 2021, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.

The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2023 and 2022, are as follows (in thousands):

	December 31, 2023		December 31, 2022
Assets (1)
Commercial real estate property, net	$	18,467,340	$	15,989,642
Cash and restricted cash	656,038		709,299
Tenant and other receivables, related party receivables, and deferred rents receivable	673,532		601,552
Other assets	2,584,765		2,551,426
Total assets	$	22,381,675	$	19,851,919
Liabilities and equity (1)
Mortgages and other loans payable, net	$	14,799,277	$	12,348,954
Deferred revenue	1,108,180		1,077,901
Lease liabilities	990,276		1,000,356
Other liabilities	447,705		456,537
Equity	5,036,237		4,968,171
Total liabilities and equity	$	22,381,675	$	19,851,919
Company's investments in unconsolidated joint ventures	$	2,983,313	$	3,190,137

(1)As of December 31, 2023, $545.6 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

99

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the years ended December 31, 2023, 2022, and 2021 are as follows (unaudited, in thousands):

	Year Ended December 31,
	2023		2022		2021
Total revenues	$	1,525,044	$	1,339,364	$	1,228,364
Operating expenses	253,630		240,002		203,332
Real estate taxes	287,462		252,806		225,104
Operating lease rent	29,048		26,152		22,576
Interest expense, net of interest income	574,032		431,865		342,910
Amortization of deferred financing costs	28,157		27,754		31,423
Depreciation and amortization	516,466		465,100		484,130
Total expenses	$	1,688,795	$	1,443,679	$	1,309,475
Loss on early extinguishment of debt	—		(467)		(2,017)
Net loss before (loss) gain on sale	$	(163,751)	$	(104,782)	$	(83,128)
Company's equity in net loss from unconsolidated joint ventures	$	(76,509)	$	(57,958)	$	(55,402)

100

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

7. Deferred Costs

Deferred costs as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Deferred leasing costs	$	399,224	$	407,188
Less: accumulated amortization	(287,761)		(286,031)
Deferred costs, net	$	111,463	$	121,157

8. Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2023 and 2022, respectively, were as follows (dollars in thousands):

Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		December 31, 2023		December 31, 2022
Fixed Rate Debt:
420 Lexington Avenue	October 2024	October 2040		3.99%	$	277,238	$	283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
7 Dey / 185 Broadway	November 2025	November 2026		6.65%	190,148		200,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
719 Seventh Avenue					—		50,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,387,386	$	3,165,814
Floating Rate Debt:
690 Madison Avenue (3)	July 2024	July 2025	S+	0.50%	$	60,000	$	60,000
719 Seventh Avenue (3)	December 2024	December 2024	S+	1.31%	50,000		—
7 Dey / 185 Broadway					—		10,148
Total floating rate debt					$	110,000	$	70,148
Total mortgages and other loans payable					$	1,497,386	$	3,235,962
Deferred financing costs, net of amortization					(6,067)		(8,399)
Total mortgages and other loans payable, net					$	1,491,319	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

(3)Included in the Company's alternative strategy portfolio.

As of December 31, 2023 and 2022, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $1.9 billion and $3.8 billion, respectively.

101

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

9. Corporate Indebtedness

2021 Credit Facility

In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2023, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of December 31, 2023, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

As of December 31, 2023, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 165 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2023, the facility fee was 30 basis points.

As of December 31, 2023, we had $2.0 million of outstanding letters of credit, $560.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $688.0 million under the 2021 credit facility. As of December 31, 2023 and December 31, 2022, the revolving credit facility had a carrying value of $554.8 million and $443.2 million, respectively, net of deferred financing costs. As of December 31, 2023 and December 31, 2022, the term loan facilities had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

In October 2022, we entered into a term loan agreement, referred to as the 2022 term loan. The 2022 term loan was repaid in full in September 2023. The 2022 term loan consisted of a $425.0 million term loan with a maturity date of October 6, 2023. The 2022 term loan had one six-month as-of-right extension option to April 6, 2024. We also had an option, subject to customary conditions, to increase the capacity of the 2022 term loan to $500.0 million on or before January 7, 2023 without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. In January 2023, the 2022 term loan was increased by $25.0 million to $425.0 million.

The 2022 term loan bore interest at a spread over adjusted Term SOFR plus 10 basis points, ranging from 100 basis points to 180 basis points, in each case based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. In instances where there were either only two ratings available or where there was more than two and the difference between them was one rating category, the applicable rating was the highest rating. In instances where there were more than two ratings and the difference between the highest and the lowest were two or more rating categories, then the applicable rating used was the average of the highest two, rounded down if the average was not a recognized category. As of December 31, 2022, the 2022 term loan had a carrying value of $398.2 million, net of deferred financing costs.

102

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2023 and 2022, respectively, by scheduled maturity date (dollars in thousands):

	December 31, 2023				December 31, 2022
Issuance	Unpaid Principal Balance		Accreted Balance		Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025
	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(205)		(308)
	$	100,000	$	99,795	$	99,692

(1)Interest rate as of December 31, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors in a private placement.

Restrictive Covenants

The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2023 and 2022, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2023, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Company's Share of Joint Venture Debt
2024	$	4,488	$	382,750	$	—	$	200,000	$	—	$	—	$	587,238	$	1,822,978
2025	—		370,000		—		—		—		100,000		470,000		1,670,861
2026	—		190,148		—		—		—		—		190,148		542,968
2027	—		550,000		560,000		1,050,000		—		—		2,160,000		1,185,168
2028	—		—		—		—		—		—		—		—
Thereafter	—		—		—		—		100,000		—		100,000		2,130,300
Total	$	4,488	$	1,492,898	$	560,000	$	1,250,000	$	100,000	$	100,000	$	3,507,386	$	7,352,275

103

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest expense before capitalized interest	$	228,840	$	166,493	$	145,197
Interest on financing leases	4,446		4,555		5,448
Interest capitalized	(95,980)		(82,444)		(78,365)
Amortization of discount on assumed debt	2,842		1,855		—
Interest income	(3,034)		(986)		(1,389)
Interest expense, net	$	137,114	$	89,473	$	70,891

10. Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Prior to 2023, Alliance Building Services, or Alliance, and its affiliates, which provide services to certain properties owned by us, were previously partially owned by Gary Green, a son of Stephen L. Green, who serves as a member and as the chairman emeritus of our Board of Directors. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements.

Income earned from the profit participation prior to 2023, which is included in Other income on the consolidated statements of operations, was $1.4 million and $1.7 million for the years ended December 31, 2022 and 2021, respectively. We also recorded expenses, inclusive of capitalized expenses, of $8.6 million and $14.0 million for these services (excluding services provided directly to tenants) for the years ended December 31, 2022 and 2021, respectively.

One Vanderbilt Avenue Investment

Our Chairman and CEO, Marc Holliday, and our former President, Andrew Mathias, made investments in our One Vanderbilt project (inclusive of the property and SUMMIT One Vanderbilt), which entitles Mr. Holliday and Mr. Mathias to receive approximately 1.27% and 0.85%, respectively, on account of the property and 1.92% and 1.28%, respectively, on account of SUMMIT One Vanderbilt, of any profits realized by the Company from its One Vanderbilt project in excess of the Company's capital contributions. Mr. Holliday and Mr. Mathias paid $1.4 million and $1.0 million, respectively, which equaled the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

Messrs. Holliday and Mathias have the right to tender their interests in the project upon stabilization (50% within three years after stabilization and 100% three years or more after stabilization). In addition, the agreement calls for us to repurchase these interests in the event of a sale of One Vanderbilt or a transactional change of control of the Company. We also have the right to repurchase these interests on the 7-year anniversary of the stabilization of the project or upon the occurrence of certain separation events prior to the stabilization of the project relating to each of Messrs. Holliday’s and Mathias’s continued service with us. The price paid upon a tender of the interests will equal the liquidation value of the interests at the time, with the value being based on the project's sale price, if applicable, or fair market value as determined by an independent third party appraiser. In 2022, stabilization of the property (but not SUMMIT One Vanderbilt) was achieved. Therefore, Messrs. Holiday and Mathias exercised their rights to tender 50% of their interests in the property (but not SUMMIT One Vanderbilt) for liquidation values of $17.9 million and $11.9 million, respectively, which were paid in July 2022.

104

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

One Vanderbilt Avenue Leases

In November 2018, we entered into a lease agreement with the One Vanderbilt Avenue joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the years ended December 31, 2023 and 2022 we recorded $3.0 million and $3.0 million, respectively, of rent expense under the lease. Additionally, in June 2021, we, through a consolidated subsidiary, entered into a lease agreement with the One Vanderbilt Avenue joint venture for SUMMIT One Vanderbilt, which commenced operations in October 2021. For the year ended December 31, 2023, we recorded $38.9 million of rent expense under the lease, including percentage rent, of which $26.2 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the year ended December 31, 2022, we recorded $33.0 million of rent expense under the lease, including percentage rent, of which $22.8 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. See Note 20, "Commitments and Contingencies."

Other

We are entitled to receive fees for providing management, leasing, construction supervision, and asset management services to certain of our joint ventures as further described in Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures and related parties as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Due from joint ventures	$	10,603	$	26,812
Other	1,565		540
Related party receivables	$	12,168	$	27,352

11. Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.

Common Units of Limited Partnership Interest in the Operating Partnership

As of December 31, 2023 and 2022, the noncontrolling interest unit holders owned 5.75%, or 3,949,448 units, and 5.39%, or 3,670,343 units, of the Operating Partnership, respectively. As of December 31, 2023, 3,949,448 shares of our common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership.

Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of our common stock at the end of the reporting period.

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	269,993	$	344,252
Distributions	(14,779)		(16,272)
Issuance of common units	25,365		22,855
Redemption and conversion of common units	(18,589)		(40,901)
Net loss	(37,465)		(5,794)
Accumulated other comprehensive income allocation	(1,960)		5,827
Fair value adjustment	15,486		(39,974)
Balance at end of period	$	238,051	$	269,993

105

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Preferred Units of Limited Partnership Interest in the Operating Partnership

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of December 31, 2023:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	5.00	%	109,161	109,161	109,161	$	50.0000	$	1,000.00	$	—	August 2015
Series F	7.00	%	60	60	60	70.0000		1,000.00		29.12		January 2007
Series K	3.50	%	700,000	563,954	341,677	0.8750		25.00		134.67		August 2014
Series L	4.00	%	500,000	378,634	372,634	1.0000		25.00		—		August 2014
Series R	3.50	%	400,000	400,000	400,000	0.8750		25.00		154.89		August 2015
Series S	4.00	%	1,077,280	1,077,280	1,077,280	1.0000		25.00		—		August 2015
Series V (5)	5.00	%	40,000	40,000	40,000	1.2500		25.00		—		May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified.

(3)If applicable, units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, after July 15, 2024 at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As such, no Subsidiary Series B Preferred Units have been issued as of December 31, 2023.

(5)The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	177,943	$	196,075
Issuance of preferred units	—		—
Redemption of preferred units	(11,700)		(17,967)
Dividends paid on preferred units	(6,271)		(6,198)
Accrued dividends on preferred units	6,529		6,033
Balance at end of period	$	166,501	$	177,943

12. Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2023, 64,726,253 shares of common stock and no shares of excess stock were issued and outstanding.

106

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, for the years ended December 31, 2023, 2022 and 2021 as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719
Year ended 2023	—	$—	36,107,719

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at par for cash. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")

In February 2021, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2023, 2022, and 2021, respectively (dollars in thousands):

	Year Ended December 31,
	2023		2022		2021
Shares of common stock issued	17,180		10,839		10,387
Dividend reinvestments/stock purchases under the DRSPP	$	525	$	525	$	738

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

107

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

SL Green's earnings per share for the years ended December 31, 2023, 2022, and 2021 are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(582,164)	$	(95,243)	$	432,214
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,039
Add back: undistributed earnings allocated to participating securities	—		—		192
Add back: effect of dilutive securities (redemption of units to common shares)	(37,465)		(5,794)		25,457
(Loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(619,629)	$	(101,037)	$	459,902

	Year Ended December 31,
Denominator	2023	2022	2021
Basic Shares:
Weighted average common stock outstanding	63,809	63,917	65,740
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,163	4,012	3,987
Stock-based compensation plans	—	—	705
Contingently issuable shares	—	—	337
Diluted weighted average common stock outstanding	67,972	67,929	70,769

The Company has excluded 1,273,417 common stock equivalents from the calculation of diluted shares outstanding for the year ended December 31, 2023. The Company has excluded 1,682,236 and 948,017 of common stock equivalents from the calculation of diluted shares outstanding for the years ended December 31, 2022 and 2021, respectively.

13. Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2023 owned 64,726,253 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such 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 the Company 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. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.

108

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Limited Partner Units

As of December 31, 2023, limited partners other than SL Green owned 5.75%, or 3,949,448 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the years ended December 31, 2023, 2022, and 2021 respectively are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(616,974)	$	(98,818)	$	460,261
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(619,629)	$	(101,037)	$	457,671
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,590
(Loss) income attributable to SLGOP common unitholders	$	(619,629)	$	(101,037)	$	460,261

	Year Ended December 31,
Denominator	2023	2022	2021
Basic units:
Weighted average common units outstanding	67,972	67,929	69,667
Effect of Dilutive Securities:
Stock-based compensation plans	—	—	765
Contingently issuable units	—	—	337
Diluted weighted average common units outstanding	67,972	67,929	70,769

The Operating Partnership has excluded 1,273,417 common unit equivalents from the diluted units outstanding for the years ended December 31, 2023. The Operating Partnership has excluded 1,682,236 and 948,017 common unit equivalents from the diluted units outstanding for the years ended December 31, 2022 and 2021, respectively.

14. Share-based Compensation

We have share-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.

109

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 32,210,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.59 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.84 fungible units per share subject to such awards, and (3) all other awards (e.g., 10-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fifth amendment and restatement in June 2022 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 32,210,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of our common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's Board of Directors, new awards may be granted under the 2005 Plan until June 1, 2032, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of December 31, 2023, 3.9 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units.

Stock Options and Class O LTIP Units

Options are granted with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership.

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information. There were no options granted during the years ended December 31, 2023, 2022, and 2021.

A summary of the status of the Company's stock options as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023			2022			2021
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of year	313,480	$	97.59	394,089	$	100.56	761,686	$	105.76
Exercised	—	—		—	—		(11,314)	72.30
Lapsed or canceled	(197,500)	84.14		(80,609)	112.14		(356,283)	112.56
Balance at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56
Options exercisable at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56

The remaining weighted average contractual life of the options outstanding was 3.0 years and the remaining average contractual life of the options exercisable was 3.0 years.

110

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

During the years ended December 31, 2023, 2022, and 2021, we recognized no compensation expense related to options. As of December 31, 2023, there was no unrecognized compensation cost related to unvested stock options.

Restricted Shares

Shares are granted to certain employees, including our executives, and vesting occurs upon the completion of a service period or our meeting established financial performance criteria. Vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	3,758,174		3,459,363		3,337,545
Granted	337,350		314,995		141,515
Canceled	(6,350)		(16,184)		(19,697)
Balance at end of year	4,089,174		3,758,174		3,459,363
Vested during the year	147,915		118,255		122,759
Compensation expense recorded	$	7,766,055	$	10,133,905	$	8,497,054
Total fair value of restricted stock granted during the year	$	15,789,540	$	16,804,931	$	9,214,531

The fair value of restricted stock that vested during the years ended December 31, 2023, 2022, and 2021 was $10.2 million, $9.7 million and $11.3 million, respectively. As of December 31, 2023, there was $20.2 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.3 years.

We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $38.1 million and $45.0 million during the years ended December 31, 2023 and 2022, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third-party consultant determined that the fair value of the LTIP Units has a discount to our common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of December 31, 2023, there was $27.1 million of total unrecognized compensation expense related to the time-based and performance-based awards, which is expected to be recognized over a weighted average period of 1.6 years.

During the years ended December 31, 2023, 2022, and 2021, we recorded compensation expense related to bonus, time-based and performance-based awards of $50.4 million, $43.5 million, and $41.9 million, respectively.

For the years ended December 31, 2023, 2022, and 2021, $1.4 million, $1.8 million, and $2.1 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of our common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the year ended December 31, 2023, 39,302 phantom stock units and 27,739 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.7 million during the year ended December 31, 2023 related to the Deferred Compensation Plan. As of December 31, 2023, there were 230,295 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

111

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Employee Stock Purchase Plan

In 2007, the Company's Board of Directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to provide equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of December 31, 2023, 224,159 shares of our common stock had been issued under the ESPP.

15. Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income by component as of December 31, 2023, 2022 and 2021 (in thousands):

	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized (loss) gain on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income (loss) before reclassifications	14,908		(18,015)		96		(3,011)
Amounts reclassified from accumulated other comprehensive loss	16,626		6,874		—		23,500
Balance at December 31, 2021	(25,881)		(21,994)		1,117		(46,758)
Other comprehensive income (loss) before reclassifications	78,300		23,405		(1,359)		100,346
Amounts reclassified from accumulated other comprehensive income	(4,619)		635		—		(3,984)
Balance at December 31, 2022	47,800		2,046		(242)		49,604
Other comprehensive (loss) income before reclassifications	17,269		6,950		(1,549)		22,670
Amounts reclassified from accumulated other comprehensive income	(39,717)		(15,080)		—		(54,797)
Balance at December 31, 2023	$	25,352	$	(6,084)	$	(1,791)	$	17,477

(1)Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of December 31, 2023 and 2022, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.4 million) and ($0.5 million), respectively.

(2)Amount reclassified from accumulated other comprehensive income is included in equity in net loss from unconsolidated joint ventures in the respective consolidated statements of operations.

112

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

16. Fair Value Measurements

We are required to disclose fair value information with regard to certain of our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of certain financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	9,591	$	—	$	9,591	$	—
Interest rate cap and swap agreements (included in Other assets)	$	33,456	$	—	$	33,456	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	17,108	$	—	$	17,108	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	11,240	$	—	$	11,240	$	—
Interest rate cap and swap agreements (included in Other assets)	$	57,660	$	—	$	57,660	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	10,142	$	—	$	10,142	$	—

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

In September 2022, the Company recorded at fair value the assets acquired and liabilities assumed at 245 Park Avenue. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts, all of which are classified as Level 3 inputs.

113

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following table provides the carrying value and fair value of these financial instruments as of December 31, 2023 and December 31, 2022 (in thousands):

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	346,745	(2)		$	623,280	(2)
Fixed rate debt	$	3,237,386	$	3,184,338	$	5,015,814	$	4,784,691
Variable rate debt (3)	270,000		268,787		520,148		519,669
Total debt	$	3,507,386	$	3,453,125	$	5,535,962	$	5,304,360

(1)Amounts exclude net deferred financing costs.

(2)As of December 31, 2023, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. As of December 31, 2022, debt and preferred equity investments had an estimated fair value ranging between $0.6 billion and $0.6 billion.

(3)As of December 31, 2023, variable rate debt with a carrying value of $110.0 million and fair value of $108.6 million is included in the Company's alternative strategy portfolio.

Disclosures regarding fair value of financial instruments was based on pertinent information available to us as of December 31, 2023 and 2022. Such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

17. Financial Instruments: Derivatives and Hedging

In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheet at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

114

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

	Notional Value	Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	150,000	2.600	%	December 2021	January 2024	Other Assets	$	11
Interest Rate Swap	200,000	4.490	%	November 2022	January 2024	Other Assets	5
Interest Rate Swap	200,000	4.411	%	November 2022	January 2024	Other Assets	5
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Assets	3,158
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Liabilities	(3,145)
Interest Rate Swap	150,000	2.621	%	December 2021	January 2026	Other Assets	4,011
Interest Rate Swap	200,000	2.662	%	December 2021	January 2026	Other Assets	5,196
Interest Rate Swap	100,000	2.903	%	February 2023	February 2027	Other Assets	2,281
Interest Rate Swap	100,000	2.733	%	February 2023	February 2027	Other Assets	2,775
Interest Rate Swap	50,000	2.463	%	February 2023	February 2027	Other Assets	1,781
Interest Rate Swap	200,000	2.591	%	February 2023	February 2027	Other Assets	6,378
Interest Rate Swap	300,000	2.866	%	July 2023	May 2027	Other Assets	7,306
Interest Rate Swap	150,000	3.524	%	January 2024	May 2027	Other Assets	549
Interest Rate Swap	370,000	3.888	%	November 2022	June 2027	Other Liabilities	(3,044)
Interest Rate Swap	300,000	4.487	%	November 2024	November 2027	Other Liabilities	(10,273)
Interest Rate Swap	100,000	3.756	%	January 2023	January 2028	Other Liabilities	(646)
							$	16,348

During the year ended December 31, 2023, we recorded a loss of $10.4 million based on the changes in the fair value of an interest rate cap we sold and a forward-starting interest rate swap, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. During the year ended December 31, 2022, we recorded a loss of $1.7 million based on the changes in the fair value of an interest rate cap we sold. No interest rate caps were sold or forward-starting interest rate swaps entered into during the year ended December 31, 2021. During the years ended December 31, 2023, 2022, and 2021, we recorded losses of $0.2 million, $0.3 million, and $0.0 million, respectively, on the changes in the fair value, which is included in interest expense in the consolidated statements of operations.

Certain agreements the Company has with each of its derivative counterparties contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of December 31, 2023, the fair value of derivatives in a net liability position, including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $17.5 million. As of December 31, 2023, the Company was not required to post any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $18.3 million as of December 31, 2023.

Gains and losses on terminated hedges are included in accumulated other comprehensive income, and are recognized into earnings over the term of the related obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive income will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that ($32.5 million) of the current balance held in accumulated other comprehensive income will be reclassified into interest expense and ($7.6 million) of the portion related to our share of joint venture accumulated other comprehensive income (loss) will be reclassified into equity in net loss from unconsolidated joint ventures within the next 12 months.

The following table presents our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the years ended December 31, 2023, 2022, and 2021, respectively (in thousands):

115

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

	Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income						Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
	Year Ended December 31,							Year Ended December 31,
Derivative	2023		2022		2021			2023		2022		2021
Interest Rate Swaps/Caps	$	18,484	$	83,162	$	15,643	Interest expense	$	42,270	$	4,989	$	(17,602)
Share of unconsolidated joint ventures' derivative instruments	7,399		24,783		(19,400)		Equity in net loss from unconsolidated joint ventures	16,050		(673)		(7,582)
	$	25,883	$	107,945	$	(3,757)		$	58,320	$	4,316	$	(25,184)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Cap	$	220,000	4.000	%	February 2023	February 2024	Asset	$	318
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,331
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,330
Interest Rate Cap	505,412		3.000	%	June 2023	June 2024	Asset	4,948
Interest Rate Cap	272,000		4.000	%	August 2023	August 2024	Asset	1,675
Interest Rate Cap	477,783		3.500	%	September 2023	September 2024	Asset	5,213
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,819
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,818
Interest Rate Swap	177,000		1.555	%	December 2022	February 2026	Asset	8,686
								$	43,034

18. Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2023 are as follows (in thousands):

2024	$	496,311
2025	470,673
2026	426,247
2027	371,117
2028	316,789
Thereafter	1,339,758
	$	3,420,895

The components of lease income from operating leases in effect at December 31, 2023, 2022 and 2021 were as follows (in thousands):

116

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

	Year Ended December 31,
	2023		2022		2021
Fixed lease payments	$	589,469	$	583,107	$	608,793
Variable lease payments	79,641		82,676		73,543
Total lease payments (1)	$	669,110	$	665,783	$	682,336
Amortization of acquired above and below-market leases	14,225		5,717		(4,160)
Total rental revenue	$	683,335	$	671,500	$	678,176

(1)Amounts include $196.5 million and $222.1 million of sublease income for the years ended December 31, 2023 and 2022, respectively.

The table below summarizes our investment in sales-type leases as of December 31, 2023:

Property	Year of Current Expiration	Year of Final Expiration (1)
15 Beekman (2)	2089	2089

(1)Reflects exercise of all available renewal options.

(2)In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures."

Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2023 are as follows (in thousands):

	Sales-type leases
2024	$	3,180
2025	3,228
2026	3,276
2027	3,325
2028	3,375
Thereafter	196,794
Total minimum lease payments	$	213,178
Amount representing interest	(107,544)
Investment in sales-type leases (1)	$	105,634

(1)This amount is included in Other assets in our consolidated balance sheets.

The components of lease income from sales-type leases during the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest income (1)	$	4,444	$	4,389	$	4,422

(1)These amounts are included in Other income in our consolidated statements of operations.

117

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

19. Benefit Plans

The building employees are covered by multi-employer defined benefit pension plans and post-retirement health and welfare plans. We participate in the Building Service 32BJ, or Union, Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employees. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2021, September 28, 2022 and September 28, 2023, the actuary certified that for the plan years beginning July 1, 2021, July 1, 2022 and July 1, 2023, the Pension Plan was in critical or endangered status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. No surcharges have been paid to the Pension Plan as of December 31, 2023. For the Pension Plan years ended June 30, 2023, 2022 and 2021, the plan received contributions from employers totaling $317.9 million, $305.7 million and $290.1 million, respectively. Our contributions to the Pension Plan represent less than 5.0% of total contributions to the plan.

The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the Health Plan years ended, June 30, 2023, 2022 and 2021, the plan received contributions from employers totaling $1.9 billion, $1.6 billion and $1.5 billion, respectively. Our contributions to the Health Plan represent less than 5.0% of total contributions to the plan.

Contributions we made to the multi-employer plans for the years ended December 31, 2023, 2022 and 2021 are included in the table below (in thousands):

	Year Ended December 31,
Benefit Plan	2023		2022		2021
Pension Plan	$	2,111	$	1,952	$	1,994
Health Plan	7,191		6,386		6,333
Other plans	789		807		849
Total plan contributions	$	10,091	$	9,145	$	9,176

401(K) Plan

In August 1997, we implemented a 401(K) Savings/Retirement Plan, or the 401(K) Plan, to cover eligible employees of ours, and any designated affiliate. The 401(K) Plan permits eligible employees to defer up to 15% of their annual compensation, subject to certain limitations imposed by the Code. The employees' elective deferrals are immediately vested and non-forfeitable upon contribution to the 401(K) Plan. During 2003, we amended our 401(K) Plan to provide for discretionary matching contributions only. For 2023, 2022 and 2021, a matching contribution equal to 100% of the first 4% of annual compensation was made. For the years ended December 31, 2023, 2022 and 2021, we made matching contributions of $1.8 million, $1.5 million, and $1.5 million, respectively.

118

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

20. Commitments and Contingencies

Legal Proceedings

As of December 31, 2023, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

Environmental Matters

Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold.

Employment Agreements

We have entered into employment agreements with certain executives, which expire between January 2025 and January 2026. The minimum cash-based compensation associated with these employment agreements, which is comprised only of base salary, totals $2.4 million for 2024.

Insurance

We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR"), within two property insurance programs and liability insurance. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. However, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned by the Company or its affiliates.

Furthermore, with respect to certain of our properties, including properties held by joint ventures or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss.

Belmont had loss reserves of $3.3 million and $3.1 million as of December 31, 2023 and 2022, respectively. Ticonderoga had no loss reserves as of December 31, 2023 and 2022.

Lease Arrangements

We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2033 to 2119, or 2043 to 2119 as fully extended. Certain leases offer extension options which we assess against relevant economic factors to determine whether we are reasonably certain of exercising or not exercising the option. Lease payments associated with renewal periods that we are reasonably certain will be exercised, if any, are included in the measurement of the corresponding lease liability and right of use asset.

Certain of our leases are subject to rent resets, generally based on a percentage of the then fair market value, a fixed amount, or a percentage of the preceding rent at specified future dates. Rent resets will be recognized in the periods in which they are incurred. Additionally, certain of our leases are subject to percentage rent arrangements based on thresholds established in the lease agreement, such as percentage of sales at the property. Percentage rents will be recognized in the periods in which they are incurred.

The table below summarizes our current lease arrangements as of December 31, 2023:

119

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
711 Third Avenue (3)	2033	2083
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt Avenue (4)	2043	2048
420 Lexington Avenue	2050	2080
SUMMIT One Vanderbilt	2058	2070
15 Beekman (5)(6)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)The Company owns 50% of the fee interest.

(4)In March 2021, the Company commenced its lease for its corporate headquarters at One Vanderbilt Avenue. See note 10, "Related Party Transactions."

(5)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(6)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2023 (in thousands):

	Financing leases		Operating leases
2024	$	3,180	$	53,455
2025	3,228		53,595
2026	3,276		53,734
2027	3,325		53,746
2028	3,375		54,211
Thereafter	196,794		1,208,864
Total minimum lease payments	$	213,178	$	1,477,605
Amount representing interest	(107,647)		—
Amount discounted using incremental borrowing rate	—		(649,913)
Total lease liabilities excluding liabilities related to assets held for sale	$	105,531	$	827,692
Total lease liabilities	$	105,531	$	827,692

The following table provides lease cost information for the Company's operating leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
Operating Lease Costs	2023		2022		2021
Operating lease costs before capitalized operating lease costs	$	29,637	$	33,773	$	30,270
Operating lease costs capitalized	(2,345)		(6,830)		(3,716)
Operating lease costs, net (1)	$	27,292	$	26,943	$	26,554

(1)This amount is included in Operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

120

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

	Year Ended December 31,
Financing Lease Costs	2023		2022		2021
Interest on financing leases before capitalized interest	$	4,446	$	4,555	$	5,448
Interest on financing leases capitalized	—		—		—
Interest on financing leases, net (1)	4,446		4,555		5,448
Amortization of right-of-use assets (2)	—		—		660
Financing lease costs, net	$	4,446	$	4,555	$	6,108

(1)These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in Depreciation and amortization in our consolidated statements of operations.

As of December 31, 2023, the weighted-average discount rate used to calculate the lease liabilities was 4.46%. As of December 31, 2023, the weighted-average remaining lease term was 28 years, inclusive of purchase options expected to be exercised.

121

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

December 31, 2023    

21. Segment Information

The Company has three reportable segments, real estate, debt and preferred equity investments, and SUMMIT. In the fourth quarter of 2023, due to quantitative thresholds, SUMMIT was identified as a reportable segment. As such, prior period segment data has been restated to reflect SUMMIT as a reportable segment for comparative purposes.

We evaluate real estate performance and allocate resources based on earnings contributions. The primary sources of revenue are generated from tenant rents, escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, insurance, real estate taxes and, at certain properties, ground rent expense. See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments. SUMMIT currently operates one location at One Vanderbilt Avenue in midtown Manhattan with the primary source of revenue generated from ticket sales.

Selected consolidated results of operations for the years ended December 31, 2023, 2022, and 2021, and selected asset information as of December 31, 2023 and 2022, regarding our operating segments are as follows (in thousands):

	Real Estate		SUMMIT		Debt and Preferred Equity		Total Company
Total revenues
Years ended:
December 31, 2023	$	760,745	$	118,260	$	34,705	$	913,710
December 31, 2022	749,293		89,048		81,113		919,454
December 31, 2021	764,659		16,311		80,340		861,310
Net (loss) income
Years ended:
December 31, 2023	$	(612,884)	$	6,101	$	7,446	$	(599,337)
December 31, 2022	(128,615)		(3,668)		55,980		(76,303)
December 31, 2021	413,401		(1,008)		68,239		480,632
Total assets
As of:
December 31, 2023	$	8,716,738	$	464,799	$	349,644	$	9,531,181
December 31, 2022	11,265,789		461,629		628,376		12,355,794

We allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment because that segment does not have dedicated personnel and the use of personnel and resources is dependent on transaction volume between the three segments, which varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. SUMMIT segment incurs its own marketing, general and administrative expenses for its dedicated personnel, which are included in SUMMIT Operator expenses in the consolidated statements of operations. For the years ended, December 31, 2023, 2022, and 2021 marketing, general and administrative expenses totaled $111.4 million, $93.8 million, and $94.9 million respectively. All other expenses, except interest and SUMMIT operator expenses, relate entirely to the real estate assets.

There were no transactions between the above three segments other than the SUMMIT lease with our One Vanderbilt Avenue joint venture, which is part of the real estate segment. See Note 10, "Related Party Transactions."

122

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2023

(in thousands)

Column A	Column B		Column C Initial Cost				Column D Cost Capitalized Subsequent To Acquisition (1)				Column E Gross Amount at Which Carried at Close of Period						Column F		Column G	Column H	Column I
Description (2)	Encumbrances		Land		Building & Improvements		Land		Building & Improvements		Land		Building & Improvements (3)		Total		Accumulated Depreciation		Date of Construction	Date Acquired	Life on  Which Depreciation is Computed
420 Lexington Ave	$	277,238	$	—	$	333,499	$	—	$	242,766	$	—	$	576,265	$	576,265	$	227,258	1927	3/1998	Various
711 Third Avenue	—		19,844		115,769		—		72,821		19,844		188,590		208,434		91,897		1955	5/1998	Various
555 W. 57th Street	—		18,846		140,946		—		12,521		18,846		153,467		172,313		98,508		1971	1/1999	Various
461 Fifth Avenue	—		—		88,276		28,873		12,680		28,873		100,956		129,829		45,700		1988	10/2003	Various
750 Third Avenue	—		51,093		251,523		—		83,936		51,093		335,459		386,552		112,937		1958	7/2004	Various
485 Lexington Avenue	450,000		78,282		452,631		—		(15,086)		78,282		437,545		515,827		201,735		1956	12/2004	Various
810 Seventh Avenue	—		114,077		550,819		—		5,406		114,077		556,225		670,302		238,462		1970	1/2007	Various
1185 Avenue of the Americas	—		—		791,106		—		139,416		—		930,522		930,522		404,093		1969	1/2007	Various
1350 Avenue of the Americas	—		90,941		431,517		—		14,566		90,941		446,083		537,024		196,985		1966	1/2007	Various
1-6 Landmark Square (4)	100,000		27,852		161,343		(6,939)		(23,245)		20,913		138,098		159,011		46,789		1973-1984	1/2007	Various
7 Landmark Square (4)	—		1,721		8,417		(1,338)		(6,240)		383		2,177		2,560		695		2007	1/2007	Various
100 Church Street	370,000		34,994		183,932		—		11,060		34,994		194,992		229,986		78,305		1959	1/2010	Various
125 Park Avenue	—		120,900		270,598		—		23,312		120,900		293,910		414,810		129,990		1923	10/2010	Various
19 East 65th Street	—		8,603		2,074		—		3,345		8,603		5,419		14,022		7		1929	1/2012	Various
304 Park Avenue	—		54,489		90,643		—		9,096		54,489		99,739		154,228		33,134		1930	6/2012	Various
760 Madison Avenue	—		284,286		8,314		(2,450)		187,847		281,836		196,161		477,997		4,991		1996/2012	7/2014	Various
719 Seventh Avenue (5)(6)	50,000		41,180		46,232		—		(4,720)		41,180		41,512		82,692		5,986		1927	7/2014	Various
110 Greene Street	—		45,120		228,393		—		4,578		45,120		232,971		278,091		57,067		1910	7/2015	Various
7 Dey / 185 Broadway	190,148		45,540		27,865		—		207,635		45,540		235,500		281,040		12,200		1921	8/2015	Various
885 Third Avenue (7)	—		138,444		244,040		(138,444)		(125,747)		—		118,293		118,293		11,040		1986	7/2020	Various
690 Madison (6)	60,000		13,820		51,732		—		28		13,820		51,760		65,580		3,863		1879	9/2021	Various
Other (8)	—		20,635		16,224		2,302		611,561		22,937		627,785		650,722		33,669
Total	$	1,497,386	$	1,210,669	$	4,495,893	$	(117,996)	$	1,467,536	$	1,092,671	$	5,963,429	$	7,056,100	$	2,035,311

(1)Includes depreciable real estate reserves and impairments recorded subsequent to acquisition.

(2)All properties located in New York, New York unless otherwise noted.

(3)Includes right of use lease assets.

(4)Property located in Connecticut.

(5)We own a 75.0% interest in this property.

(6)Property is included in the Company's alternative strategy portfolio.

(7)In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

(8)Other includes a land development project, tenant improvements of eEmerge, capitalized interest and corporate improvements.

123

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2023

(in thousands)

The changes in real estate for the years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	$	9,198,799	$	7,650,907	$	7,355,079
Property acquisitions	—		1,900,042		124,103
Improvements	241,213		335,413		296,876
Retirements/disposals/deconsolidation	(2,383,912)		(687,563)		(125,151)
Balance at end of year	$	7,056,100	$	9,198,799	$	7,650,907

The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes as of December 31, 2023 was $4.4 billion (unaudited).

The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	$	2,039,554	$	1,896,199	$	1,956,077
Depreciation for year	199,576		175,465		174,219
Retirements/disposals/deconsolidation	(203,819)		(32,110)		(234,097)
Balance at end of year	$	2,035,311	$	2,039,554	$	1,896,199

124

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

125

ITEM 9A.    CONTROLS AND PROCEDURES

SL GREEN REALTY CORP.

Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to the Company's management, including the Company's Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based closely on the definition of "disclosure controls and procedures" in Rule 13a-15(e) of the Exchange Act. Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that it will detect or uncover failures within the Company to disclose material information otherwise required to be set forth in our periodic reports. Also, the Company has investments in certain unconsolidated entities. As the Company does not control these entities, its disclosure controls and procedures with respect to such entities are necessarily substantially more limited than those the Company maintains with respect to its consolidated subsidiaries.

As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of the Company's management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based upon that evaluation as of the end of the period covered by this report, the Company's Chief Executive Officer and Chief Financial Officer concluded that its disclosure controls and procedures were effective to give reasonable assurances to the timely collection, evaluation and disclosure of information relating to the Company that would potentially be subject to disclosure under the Exchange Act and the rules and regulations promulgated thereunder.

Management's Report on Internal Control over Financial Reporting

The Company is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Under the supervision and with the participation of the Company's management, including our Chief Executive Officer and Chief Financial Officer, the Company conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2023 based on the framework in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) (COSO). Based on that evaluation, the Company concluded that its internal control over financial reporting was effective as of December 31, 2023.

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 or compliance with the policies or procedures may deteriorate.

The effectiveness of the Company's internal control over financial reporting as of December 31, 2023 has been audited by Ernst & Young LLP, an independent registered public accounting firm, as stated in their report which appears herein.

Changes in Internal Control over Financial Reporting

There have been no significant changes in the Company's internal control over financial reporting during the year ended December 31, 2023 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

SL GREEN OPERATING PARTNERSHIP, L.P.

Evaluation of Disclosure Controls and Procedures

The Operating Partnership maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed in the Operating Partnership's Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to the Operating Partnership's management, including the Chief Executive Officer and Chief Financial Officer of the Operating Partnership's general partner, as appropriate, to allow timely decisions regarding required disclosure based closely on the definition of “disclosure controls and procedures” in Rule 13a-15(e) of the Exchange Act. Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that it will detect or uncover failures within the Operating Partnership to disclose material information otherwise required to be set forth in the Operating Partnership's periodic reports. Also, the Operating Partnership has investments in certain unconsolidated entities. As the Operating Partnership does not control these entities, the Operating Partnership's disclosure controls and procedures with respect to such entities are necessarily substantially more limited than those it maintains with respect to its consolidated subsidiaries.

126

As of the end of the period covered by this report, the Operating Partnership carried out an evaluation, under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer of the Operating Partnership's general partner, of the effectiveness of the design and operation of the Operating Partnership's disclosure controls and procedures. Based upon that evaluation as of the end of the period covered by this report, the Chief Executive Officer and Chief Financial Officer of the Operating Partnership's general partner concluded that the Operating Partnership's disclosure controls and procedures were effective to give reasonable assurances to the timely collection, evaluation and disclosure of information relating to the Operating Partnership that would potentially be subject to disclosure under the Exchange Act and the rules and regulations promulgated thereunder.

Management’s Report on Internal Control over Financial Reporting

The Operating Partnership is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15 (f) and 15d-15 (f). Under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer of the Operating Partnership's general partner, the Operating Partnership conducted an evaluation of the effectiveness of its internal control over financial reporting as of December 31, 2023 based on the framework in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) (COSO). Based on that evaluation, the Operating Partnership concluded that its internal control over financial reporting was effective as of December 31, 2023.

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 or compliance with the policies or procedures may deteriorate.

The effectiveness of the Operating Partnership's internal control over financial reporting as of December 31, 2023 has been audited by Ernst & Young LLP, an independent registered public accounting firm, as stated in their report which appears herein.

Changes in Internal Control over Financial Reporting

There have been no significant changes in the Operating Partnership's internal control over financial reporting during the year ended December 31, 2023 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

127

Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of SL Green Realty Corp.

Opinion on Internal Control Over Financial Reporting

We have audited SL Green Realty Corp.'s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, SL Green Realty Corp. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the 2023 consolidated financial statements of the Company and our report dated February 23, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible 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 an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the 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 audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

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 (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) 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.

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.

/s/ Ernst & Young LLP

New York, New York

February 23, 2024

128

Report of Independent Registered Public Accounting Firm

To the Partners of SL Green Operating Partnership, L.P.

Opinion on Internal Control Over Financial Reporting

We have audited SL Green Operating Partnership, L.P.'s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, SL Green Operating Partnership, L.P. (the Operating Partnership) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the 2023 consolidated financial statements of the Operating Partnership and our report dated February 23, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

The Operating Partnership’s management is responsible 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 an opinion on the Operating Partnership's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Operating 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 audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

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 (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) 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.

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.

/s/ Ernst & Young LLP

New York, New York

February 23, 2024

129

ITEM 9B.    OTHER INFORMATION

None.

130

ITEM 9C.    DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

131

PART III

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by Item 10 will be set forth in our Definitive Proxy Statement for our 2024 Annual Meeting of Stockholders, to be filed pursuant to Regulation 14A under the Securities and Exchange Act of 1934, as amended, on or prior to April 29, 2024, or the 2024 Proxy Statement, and is incorporated herein by reference.

ITEM 11.    EXECUTIVE COMPENSATION

The information required by Item 11 will be set forth in the 2024 Proxy Statement and is incorporated herein by reference.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by Item 12 will be set forth in the 2024 Proxy Statement and is incorporated herein by reference.

The following table summarizes information, as of December 31, 2023, relating to our equity compensation plans pursuant to which shares of our common stock or other equity securities may be granted from time to time.

	Number of securities to be issued upon exercise of outstanding options, warrants and rights		Weighted average exercise price of outstanding options, warrants and rights			Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Plan category	(a)		(b)			(c)
Equity compensation plans approved by security holders (1)	4,692,094	(2)	$	103.52	(3)	4,139,076	(4)
Equity compensation plans not approved by security holders	—		—			—
Total	4,692,094		$	103.52		4,139,076

(1)Includes our Fifth Amended and Restated 2005 Stock Option and Incentive Plan, Amended 1997 Stock Option and Incentive Plan, as amended, and 2008 Employee Stock Purchase Plan.

(2)Includes (i) 115,980 shares of common stock issuable upon the exercise of outstanding options (115,980 of which are vested and exercisable), (ii) 230,295 phantom stock units that may be settled in shares of common stock (230,295 of which are vested), (iii) 2,990,461 LTIP units that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to us for redemption and acquired by us for shares of our common stock (1,366,248 of which are vested).

(3)Because there is no exercise price associated with restricted stock units, phantom stock units or LTIP units, these awards are not included in the weighted-average exercise price calculation.

(4)Balance is after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units. The number of securities remaining available consists of shares remaining available for issuance under our 2008 Employee Stock Purchase Plan and Fifth Amended and Restated 2005 Stock Option and Incentive Plan.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Item 13 will be set forth under in the 2024 Proxy Statement and is incorporated herein by reference.

ITEM 14.    PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information regarding principal accountant fees and services and the audit committee's pre-approval policies and procedures required by this Item 14 will be set forth in the 2024 Proxy Statement and is incorporated herein by reference.

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PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENTS AND SCHEDULES

(a)(1) Consolidated Financial Statements

SL GREEN REALTY CORP.
Report of Independent Registered Public Accounting Firm	56
Consolidated Balance Sheets as of December 31, 2023 and 2022	59
Consolidated Statements of Operations for the years ended December 31, 2023, 2022 and 2021	61
Consolidated Statements of Comprehensive (Loss) Income for the years ended December 31, 2023, 2022 and 2021	62
Consolidated Statements of Equity for the years ended December 31, 2023, 2022 and 2021	63
Consolidated Statements of Cash Flows for the years ended December 31, 2023, 2022 and 2021	64
SL GREEN OPERATING PARTNERSHIP, L.P.
Report of Independent Registered Public Accounting Firm	67
Consolidated Balance Sheets as of December 31, 2023 and 2022	70
Consolidated Statements of Operations for the years ended December 31, 2023, 2022 and 2021	72
Consolidated Statements of Comprehensive (Loss) Income for the years ended December 31, 2023, 2022 and 2021	73
Consolidated Statements of Equity for the years ended December 31, 2023, 2022 and 2021	74
Consolidated Statements of Cash Flows for the years ended December 31, 2023, 2022 and 2021	75
Notes to Consolidated Financial Statements	78
(a)(2)    Financial Statement Schedules
Schedule III—Real Estate and Accumulated Depreciation as of December 31, 2023	123

Schedules other than those listed are omitted as they are not applicable or the required or equivalent information has been included in the financial statements or notes thereto.

(a)(3)    In reviewing the agreements included as exhibits to this Annual Report on Form 10-K, please remember they are included to provide you with information regarding their terms and are not intended to provide any other factual or disclosure information about us or the other parties to the agreements. The agreements contain representations and warranties by each of the parties to the applicable agreement. These representations and warranties have been made solely for the benefit of the other parties to the applicable agreement and:

•should not in all instances be treated as categorical statements of fact, but rather as a way of allocating the risk to one of the parties if those statements prove to be inaccurate;

•have been qualified by disclosures that were made to the other party in connection with the negotiation of the applicable agreement, which disclosures are not necessarily reflected in the agreement;

•may apply standards of materiality in a way that is different from what may be viewed as material to you or other investors; and

•were made only as of the date of the applicable agreement or such other date or dates as may be specified in the agreement and are subject to more recent developments.

Accordingly, these representations and warranties may not describe the actual state of affairs as of the date they were made or at any other time. Additional information about us may be found elsewhere in this Annual Report on Form 10-K and our other public filings, which are available without charge through the SEC's website at http://www.sec.gov.

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INDEX TO EXHIBITS

3.1	Articles of Restatement, incorporated by reference to the Company's Form 10-Q, dated July 11, 2014, filed with the SEC on August 11, 2014.
3.2	Articles of Amendment to the Company’s Articles of Restatement, incorporated by reference to the Company’s Form 8-K, dated July 18, 2017, filed with the SEC on July 18, 2017.
3.3	Articles of Amendment to the Company’s Articles of Restatement, incorporated by reference to Exhibit 3.1 to the Company’s Form 8-K, dated January 20, 2021, filed with the SEC on January 20, 2021.
3.4	Articles of Amendment to the Company’s Articles of Restatement, incorporated by reference to Exhibit 3.2 to the Company’s Form 8-K, dated January 20, 2021, filed with the SEC on January 20, 2021.
3.5	Articles of Amendment to the Company's Articles of Restatement, incorporated by reference to Exhibit 3.1 to the Company's Form 8-K, dated January 21, 2022, filed with the SEC on January 21, 2022.
3.6	Articles of Amendment to the Company's Articles of Restatement, incorporated by reference to Exhibit 3.2 to the Company's Form 8-K, dated January 21, 2022, filed with the SEC on January 21, 2022.
3.7	Fifth Amended and Restated Bylaws of the Company, incorporated by reference to the Company's Form 8-K, dated December 21, 2018, filed with the SEC on December 28, 2018.
3.8	First Amendment to Fifth Amended and Restated Bylaws of the Company, effective as of May 11, 2020, incorporated by reference to the Company's Form 8-K, dated May 11, 2020, filed with the SEC on May 13, 2020.
3.9	Articles Supplementary Electing that SL Green Realty Corp. be Subject to Maryland General Corporations Law Section 3-804(c), incorporated by reference to the Company's Form 8-K, dated September 16, 2009, filed with the SEC on September 16, 2009.
3.10	Articles Supplementary reclassifying 4,600,000 shares of 8.0% Series A Convertible Cumulative Preferred Stock, 1,300,000 shares of Series B Junior Participating Preferred Stock and 4,000,000 shares of 7.875% Series D Cumulative Redeemable Preferred Stock into authorized preferred stock without further designation, incorporated by reference to the Company's Form 8-K, dated August 9, 2012, filed with the SEC on August 10, 2012.
3.11	Articles Supplementary classifying and designating 9,200,000 shares of the Company's 6.50% Series I Cumulative Redeemable Preferred Stock, liquidation preference $25.00 per share, par value $0.01 per share, incorporated by reference to the Company's Form 8-K, dated August 9, 2012, filed with the SEC on August 10, 2012.
3.12	First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, incorporated by reference to the Company's Form 8-K, dated October 23, 2002, filed with the SEC on October 23, 2002.
3.13	First Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated May 14, 1998, incorporated by reference to the Company's Form 8-K, dated October 23, 2002, filed with the SEC on October 23, 2002.
3.14	Second Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2002, filed with the SEC on July 31, 2002.
3.15	Fifth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of March 15, 2006, incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2005, filed with the SEC on March 16, 2006.
3.16	Seventh Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of January 25, 2007, incorporated by reference to the Company's Form 8-K, dated January 24, 2007, filed with the SEC on January 30, 2007.
3.17	Eighth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of January 20, 2010, incorporated by reference to the Company's Form 8-K, dated January 20, 2010, filed with the SEC on January 20, 2010.
3.18	Tenth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of January 31, 2012, incorporated by reference to the Company's Form 8-K, dated January 31, 2012, filed with the SEC on February 2, 2012.
3.19	Eleventh Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated March 6, 2012, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, filed with the SEC on May 10, 2012.
3.20	Twelfth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of August 10, 2012, incorporated by reference to the Company's Form 8-K, dated August 10, 2012, filed with the SEC on August 10, 2012.
3.21	Fourteenth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of July 1, 2014, incorporated by reference to the Company's Form 8-K, dated July 2, 2014, filed with the SEC on July 2, 2014.

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3.22	Fifteenth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of July 1, 2014, incorporated by reference to the Company's Form 8-K, dated July 2, 2014, filed with the SEC on July 2, 2014.
3.23	Eighteenth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of June 25, 2015, incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on February 18, 2022.
3.24	Nineteenth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of July 22, 2015, incorporated by reference to the Company's Form 8-K, dated July 24, 2015, filed with the SEC on July 24, 2015.
3.25	Twentieth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of July 22, 2015, incorporated by reference to the Company's Form 8-K, dated July 24, 2015, filed with the SEC on July 24, 2015.
3.26	Twenty-First Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of August 20, 2015, incorporated by reference to the Company's Form 8-K, dated as of August 21, 2015, filed with the SEC on August 21, 2015.
3.27	Twenty-Second Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of August 20, 2015, incorporated by reference to the Company's Form 8-K, dated as of August 21, 2015, filed with the SEC on August 21, 2015.
3.28	Twenty-Fifth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of June 17, 2016, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, filed with the SEC on November 9, 2016.
3.29	Twenty-Sixth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of May 1, 2019, incorporated by reference to the Company's Form 8-K, dated as of May 3, 2019, filed with the SEC on May 3, 2019.
3.30	Twenty-Seventh Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of January 8, 2020, incorporated by reference to the Company's Form 8-K, dated as of January 14, 2020, filed with the SEC on January 14, 2020.
3.31	Twenty-Eighth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of December 20, 2021, incorporated by reference to the Company's Form 8-K, dated as of December 20, 2021, filed with the SEC on December 22, 2021.
3.32	Twenty-Ninth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of October 26, 2022, incorporated by reference to the Company's Form 8-K, dated as of October 26, 2022, filed with the SEC on October 28, 2022.
3.33	Thirtieth Amendment to the First Amended and Restated Agreement of Limited Partnership of the Operating Partnership, dated as of April 20, 2023, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2023, filed with the SEC on May 5, 2023.
4.1	Specimen Common Stock Certificate, incorporated by reference to the Company's Registration Statement on Form S-11 (No. 333-29329), declared effective by the SEC on August 14, 1997.
4.2	Form of stock certificate evidencing the 6.50% Series I Cumulative Redeemable Preferred Stock of the Company, liquidation preference $25.00 per share, par value $0.01 per share, incorporated by reference to the Company's Form 8-K, dated August 9, 2012, filed with the SEC on August 10, 2012.
4.3	Indenture, dated as of August 5, 2011, among the Company, the Operating Partnership and ROP, as Co-Obligors, and The Bank of New York Mellon, as Trustee, incorporated by reference to the Company's Form 8-K, dated August 5, 2011, filed with the SEC on August 5, 2011.
4.4	Junior Subordinated Indenture, dated as of June 30, 2005, between the Operating Partnership and JPMorgan Chase Bank, National Association, as Trustee, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2005, filed with the SEC on August 9, 2005.
4.5	Indenture, dated as of October 5, 2017, among the Operating Partnership and The Bank of New York Mellon, as Trustee, incorporated by reference to the Company’s Form 8-K, dated October 5, 2017, filed with the SEC on October 5, 2017.
4.6	Description of the registrant's securities registered pursuant to section 12 of the Securities and Exchange Act of 1934, filed herewith.
10.1	Amended and Restated Agreement of Limited Partnership of ROP, dated December 6, 1995, incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 23, 2018.
10.2	Supplement to the Amended and Restated Agreement of Limited Partnership of ROP relating to the succession as a general partner of Wyoming Acquisition GP LLC, incorporated by reference to ROP's Annual Report on Form 10-K for the year ended December 31, 2007, filed with the SEC on March 31, 2008.

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10.3	Form of Articles of Incorporation and Bylaws of S.L. Green Management Corp., incorporated by reference to the Company's Registration Statement on Form S-11 (No. 333-29329), declared effective by the SEC on August 14, 1997.
10.4	Form of Registration Rights Agreement between the Company and the persons named therein, incorporated by reference to the Company's Registration Statement on Form S-11 (No. 333-29329), declared effective by the SEC on August 14, 1997.
10.5	Amended and Restated Trust Agreement among the Operating Partnership, as depositor, JPMorgan Chase Bank, National Association, as property trustee, Chase Bank USA, National Association, as Delaware trustee, and the administrative trustees named therein, dated June 30, 2005, incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2005, filed with the SEC on August 9, 2005.
10.6	SL Green Realty Corp. Fifth Amended and Restated 2005 Stock Option and Incentive Plan, incorporated by reference to Appendix A to the Company's definitive Proxy Statement on Schedule 14A filed on April 21, 2022
10.7	Amended and Restated Non-Employee Directors' Deferral Program, dated December 13, 2017, incorporated by reference to the Company's Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 23, 2018.
10.8	Amended and Restated Employment and Non-competition Agreement, dated December 24, 2010, between Stephen L. Green and the Company, incorporated by reference to the Company's Form 8-K, dated December 23, 2010, filed with the SEC on December 29, 2010.
10.9	Deferred Compensation Agreement, dated December 18, 2009, between the Company and Stephen L. Green, incorporated by reference to the Company's Form 8-K, dated December 18, 2009, filed with the SEC on December 24, 2009.
10.10	Deferred Compensation Agreement, dated December 24, 2010, between the Company and Stephen L. Green, incorporated by reference to the Company's Form 8-K, dated December 23, 2010, filed with the SEC on December 29, 2010.
10.11	Deferred Compensation Agreement (2013), dated as of September 12, 2013, by and between the Company and Marc Holliday, incorporated by reference to the Company’s Form 8-K, dated September 12, 2013, filed with the SEC on September 13, 2013.
10.12	Deferred Compensation Agreement, dated as of February 10, 2016, by and between SL Green Realty Corp. and Marc Holliday, incorporated by reference to the Company's Form 8-K, dated February 10, 2016, filed with the SEC on February 12, 2016.
10.13	Deferred Compensation Agreement (2014), dated as of November 8, 2013, between the Company and Andrew Mathias, incorporated by reference to the Company’s Form 8-K, dated November 8, 2013, filed with the SEC on November 8, 2013.
10.14	Amended and Restated Employment and Noncompetition Agreement, dated as of December 31, 2021, by and between SL Green Realty Corp. and Marc Holliday, incorporated by reference to the Company's Form 8-K/A, dated December 31, 2021, filed with the SEC on January 6, 2022.
10.15	Letter Agreement, dated as of April 30, 2018, by and between SL Green Realty Corp. and Marc Holliday, incorporated by reference to the Company's Form 8-K, dated April 27, 2018, filed with the SEC on May 3, 2018.
10.16	Amended and Restated Employment and Noncompetition Agreement, dated as of December 31, 2021, by and between SL Green Realty Corp. and Andrew Levine, incorporated by reference to the Company's Form 8-K/A, dated December 31, 2021, filed with the SEC on January 6, 2022.
10.17	Chairman Emeritus Agreement, dated as of December 21, 2018, by and between SL Green Realty Corp. and Stephen L. Green, incorporated by reference to the Company's Form 8-K, dated December 21, 2018, filed with the SEC on December 28, 2018.
10.18	Third Amended and Restated Credit Agreement, dated as of December 6, 2021, by and among SL Green Realty Corp. and SL Green Operating Partnership, L.P., as Borrowers, each of the Lenders party thereto, Wells Fargo Bank, National Association, as Administrative Agent, Wells Fargo Securities, LLC, JPMorgan Chase Bank, N.A., Deutsche Bank Securities Inc. and TD Bank, N.A., as joint lead arrangers and joint bookrunners for the Revolving Credit Facility and Term Loan A Facility, BofA Securities, Inc. BMO Capital Markets Corp. and The Bank of New York Mellon, as joint lead arrangers for the Revolving Credit Facility and Term Loan A Facility, JPMorgan Chase Bank, N.A., as syndication agent for the Revolving Credit Facility and Term Loan A Facility, Deutsche Bank Securities Inc., TD Bank N.A., Bank of America, N.A., Bank of Montreal and The Bank of New York Mellon, as documentation agents for the Revolving Credit Facility and Term Loan A Facility, Wells Fargo Securities, LLC and U.S. Bank National Association, as joint lead arrangers and joint bookrunners for the Term Loan B Facility, U.S. Bank National Association, as syndication agent for the Term Loan B Facility, Wells Fargo Bank, National Association, as sustainability agent, and the other lenders and agents a party thereto, incorporated by reference to the Company's Form 8-K, dated December 6, 2021, filed with the SEC on December 8, 2021.
10.19	Amended and Restated Employment and Noncompetition Agreement, dated as of March 2, 2023, by and between SL Green Realty Corp. and Matthew DiLiberto, incorporated by reference to the Company's Form 8-K, dated March 2, 2023, filed with the SEC on March 6, 2023.

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10.20	Non-Renewal and Advisory Agreement, dated as of October 9, 2023, by and between SL Green Realty Corp. and Andrew Mathias, incorporated by reference to the Company's Form 8-K, dated October 9, 2023, filed with the SEC on October 10, 2023.
10.21	First Amendment to Amended and Restated Employment and Noncompetition Agreement, dated as of January 30, 2024, by and between SL Green Realty Corp. and Matthew DiLiberto, incorporated by reference to the Company's Form 8-K, dated January 30, 2024, filed with the SEC on February 2, 2024.
16.1	Letter of Ernst & Young LLP, dated November 29, 2023, to the Securities and Exchange Commission, incorporated by reference to the Company's Form 8-K, dated November 29, 2023, filed with the SEC on November 29, 2023.
21.1	Subsidiaries of SL Green Realty Corp., filed herewith.
21.2	Subsidiaries of SL Green Operating Partnership L.P., filed herewith.
23.1	Consent of Ernst & Young LLP for SL Green Realty Corp., filed herewith.
23.2	Consent of Ernst & Young LLP for SL Green Operating Partnership, L.P., filed herewith.
24.1	Power of Attorney for SL Green Realty Corp., included on the signature page of this Form 10-K.
24.2	Power of Attorney for SL Green Operating Partnership, L.P., included on the signature page of this Form 10-K.
31.1	Certification by the Chief Executive Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.2	Certification by the Chief Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.3	Certification by the Chief Executive Officer of the Company, the sole general partner of the Operating Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.4	Certification by the Chief Financial Officer of the Company, the sole general partner of the Operating Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.1	Certification by the Chief Executive Officer pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
32.2	Certification by the Chief Financial Officer pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
32.3	Certification by the Chief Executive Officer of the Company, the sole general partner of the Operating Partnership pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
32.4	Certification by the Chief Financial Officer of the Company, the sole general partner of the Operating Partnership pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
97.1	Compensation Recovery Policy, filed herewith.
101	The following financial statements from SL Green Realty Corp. and SL Green Operating Partnership L.P.’s Annual Report on Form 10-K for the year ended December 31, 2023, formatted in Inline XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Operations, (iii) Consolidated Statements of Comprehensive (Loss) Income, (iv) Consolidated Statements of Equity, (v) Consolidated Statements of Capital, (vi) Consolidated Statements of Cash Flows, and (vii) Notes to Consolidated Financial Statements, detail tagged and filed herewith.
104	Cover Page Interactive Data File (formatted in Inline XBRL in Exhibit 101)

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SL GREEN REALTY CORP.
	By:	/s/ Matthew J. DiLiberto
Dated: February 23, 2024		Matthew J. DiLiberto  Chief Financial Officer

________________________________________________________________________________________________________________________

KNOW ALL MEN BY THESE PRESENTS, that we, the undersigned officers and directors of SL Green Realty Corp. hereby severally constitute Marc Holliday and Matthew J. DiLiberto, and each of them singly, our true and lawful attorneys and with full power to them, and each of them singly, to sign for us and in our names in the capacities indicated below, the Annual Report on Form 10-K filed herewith and any and all amendments to said Annual Report on Form 10-K, and generally to do all such things in our names and in our capacities as officers and directors to enable SL Green Realty Corp. to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys, or any of them, to said Annual Report on Form 10-K and any and all amendments thereto.

138

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated:

Signatures	Title	Date
/s/ Marc Holliday	Chairman of the Board of Directors, Chief Executive Officer and Interim President (Principal Executive Officer)	February 23, 2024
Marc Holliday
/s/ Matthew J. DiLiberto	Chief Financial Officer (Principal Financial and Accounting Officer)	February 23, 2024
Matthew J. DiLiberto
/s/ Stephen L. Green	Director	February 23, 2024
Stephen L. Green
/s/ Andrew W. Mathias	Director	February 22, 2024
Andrew W. Mathias
/s/ John H. Alschuler Jr.	Director	February 23, 2024
John H. Alschuler, Jr.
/s/ Edwin T. Burton, III	Director	February 23, 2024
Edwin T. Burton, III
/s/ Craig M. Hatkoff	Director	February 23, 2024
Craig M. Hatkoff
/s/ Betsy S. Atkins	Director	February 23, 2024
Betsy S. Atkins
/s/ Lauren B. Dillard	Director	February 23, 2024
Lauren B. Dillard
/s/ Carol Brown	Director	February 23, 2024
Carol Brown

139

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SL GREEN OPERATING PARTNERSHIP, L.P.
	By:	SL Green Realty Corp.
		/s/ Matthew J. DiLiberto
Dated: February 23, 2024	By:	Matthew J. DiLiberto  Chief Financial Officer

________________________________________________________________________________________________________________________

KNOW ALL MEN BY THESE PRESENTS, that we, the undersigned officers and directors of SL Green Realty Corp., the sole general partner of SL Green Operating Partnership, L.P., hereby severally constitute Marc Holliday and Matthew J. DiLiberto, and each of them singly, our true and lawful attorneys and with full power to them, and each of them singly, to sign for us and in our names in the capacities indicated below, the Annual Report on Form 10-K filed herewith and any and all amendments to said Annual Report on Form 10-K, and generally to do all such things in our names and in our capacities as officers and directors to enable SL Green Operating Partnership, L.P. to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys, or any of them, to said Annual Report on Form 10-K and any and all amendments thereto.

140

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated:

Signatures	Title	Date
/s/ Marc Holliday	Chairman of the Board of Directors, Chief Executive Officer and Interim President of SL Green, the sole general partner of the Operating Partnership (Principal Executive Officer)	February 23, 2024
Marc Holliday
/s/ Matthew J. DiLiberto	Chief Financial Officer of SL Green, the sole general partner of the Operating Partnership (Principal Financial and Accounting Officer)	February 23, 2024
Matthew J. DiLiberto
/s/ Stephen L. Green	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Stephen L. Green
/s/ Andrew W. Mathias	Director of SL Green, the sole general partner of the Operating Partnership	February 22, 2024
Andrew W. Mathias
/s/ John H. Alschuler, Jr.	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
John H. Alschuler, Jr.
/s/ Edwin T. Burton, III	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Edwin T. Burton, III
/s/ Craig M. Hatkoff	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Craig M. Hatkoff
/s/ Betsy S. Atkins	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Betsy S. Atkins
/s/ Lauren B. Dillard	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Lauren B. Dillard
/s/ Carol Brown	Director of SL Green, the sole general partner of the Operating Partnership	February 23, 2024
Carol Brown

141

EX-4.6

Exhibit 4.6

DESCRIPTION OF THE REGISTRANT'S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES AND EXCHANGE ACT OF 1934

As of the date of our annual report on Form 10-K of which this Exhibit is a part, we have the following classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"): (1) our common stock, par value $0.01 per share and (2) our 6.500% Series I Redeemable Cumulative Preferred Stock, par value $0.01 per share.

DESCRIPTION OF COMMON STOCK

The following description of the terms of SL Green's common stock is only a summary. This description is subject to, and qualified in its entirety by reference to, SL Green's charter and bylaws, each as amended, each of which has previously been filed with the Securities and Exchange Commission (the "SEC"), and the Maryland General Corporation Law (the "MGCL"). The terms "we," "us" and "our" as such terms are used in the following description of common stock refer to SL Green Realty Corp. unless the context requires otherwise.

General

Our charter provides that we may issue up to 160,000,000 shares of common stock, $0.01 par value per share. Subject to the provisions of the charter regarding excess stock, each outstanding share of common stock entitles the holder to one vote on all matters submitted to a vote of stockholders, including the election of directors, and, except as provided with respect to any other class or series of stock, the holders of this stock will possess the exclusive voting power. There is no cumulative voting in the election of directors, which means that the holders of a majority of the outstanding shares of common stock can elect all of the directors then standing for election and the holders of the remaining shares will not be able to elect any directors. As of February 22, 2024, 64,799,013 shares of SL Green Realty Corp.'s common stock, par value $0.01 per share, were outstanding. Company to provide updated share info.

All issued and outstanding shares of common stock are validly issued, fully paid and non-assessable. Subject to the preferential rights of any other shares or series of stock and to the provisions of the charter regarding excess stock, holders of shares of common stock are entitled to receive dividends on this stock if, as and when authorized by our board of directors and declared by us out of assets legally available therefor and to share ratably in our assets legally available for distribution to our stockholders in the event of our liquidation, dissolution or winding up after payment of or adequate provision for all of our known debts and liabilities.

Holders of shares of common stock have no preference, conversion, exchange, sinking fund, redemption or appraisal rights and have no preemptive rights to subscribe for any of our securities. Subject to the provisions of the charter regarding excess stock, shares of common stock will have equal dividend, liquidation and other rights.

Listing

Our common stock is listed on the New York Stock Exchange ("NYSE") under the symbol "SLG."

Certain Provisions of Our Charter and Bylaws

Our charter authorizes our board of directors to reclassify any unissued shares of common stock into other classes or series of stock and to establish the number of shares in each class or series and to set the preferences, conversion and other rights, voting powers, restrictions, limitations and restrictions on ownership, limitations as to dividends or other distributions, qualifications and terms or conditions of redemption for each class or series.

Our board of directors currently consists of ten directors, which number may be increased or decreased pursuant to our bylaws but shall never be less than the minimum number required by the Maryland General Corporation Law (which is one). Our directors are elected at each annual meeting of stockholders to serve until the next annual meeting of stockholders and until their successors are duly elected and qualified.

Our charter also provides that, except for any directors who may be elected by holders of a class or series of capital stock other than our common stock, directors may be removed only for cause, as defined in our charter, and only by the affirmative vote of stockholders holding at least a majority of all the votes entitled to be cast generally for the election of directors. Vacancies on the board of directors may be filled only by the affirmative vote of a majority of the remaining directors.

Our bylaws provide for the election of directors, in uncontested elections, by a majority of the votes cast. In contested elections, our bylaws provide for the election of directors by a plurality of the votes cast.

We have adopted a policy on majority voting in the election of directors in an uncontested election at a duly called meeting of stockholders. Pursuant to this policy, when a quorum is present, any nominee who fails to receive a majority of the votes cast for his or her election will, within ten business days following the certification of the stockholder vote, tender his or her written resignation to the Chairman of the Board for consideration by our Nominating and Corporate Governance Committee. Our Nominating and Corporate Governance Committee will consider the resignation and, within 60 days following the date of the stockholders' meeting at which the election occurred, will make a recommendation to our board of directors concerning the acceptance or rejection of the resignation.

Under the policy, our board of directors will take formal action on the recommendation no later than 90 days following the date of the stockholders' meeting. In considering the recommendation, our board of directors will consider the information, factors and alternatives considered by the Nominating and Corporate Governance Committee and such additional factors, information and alternatives as the board of directors deems relevant. We will publicly disclose, in a Form 8-K filed with the SEC, the board of directors' decision within four business days after the decision is made. Our board of directors also will provide, if applicable, its reason or reasons for rejecting the tendered resignation.

Our bylaws permit any eligible stockholder or group of up to 20 stockholders who has owned continuously for at least three years (as determined in accordance with our bylaws) 3% or more of our outstanding common stock to include up to a specified number of director nominees in our proxy materials for an annual meeting of stockholders, provided that the stockholders and the nominees satisfy the requirements specified in our bylaws. The maximum number of stockholder nominees permitted under the proxy access provisions of our bylaws will not exceed the greater of (i) two or (ii) 20% of the number of directors in office as of the last day on which a notice of proxy access nomination may be timely received by us. If the 20% calculation does not result in a whole number, the maximum number of stockholder nominees is the closest whole number below 20%. The proxy access provisions of our bylaws require certain information and representations to be provided or made by nominating stockholders and contain certain other procedural provisions. In addition, our bylaws provide that all nominees for director must provide certain information, representations and agreements to us in order to be eligible for election or re-election as a director.

Our bylaws also permit our stockholders to alter or amend the bylaws or to adopt new bylaws. Specifically, Article XIV of the bylaws permits our stockholders to alter or amend the bylaws or to adopt new bylaws by the affirmative vote of a majority of all the votes entitled to be cast on the matter. Our board of directors also has the ability to alter or amend the bylaws or to adopt new bylaws.

Restrictions on Ownership

For us to qualify as a real estate investment trust ("REIT") under the Internal Revenue Code of 1986, as amended (the "Code"), not more than 50% in value of our outstanding capital stock may be owned, directly or indirectly, by five or fewer individuals, according to the definition in the Code, during the last half of a taxable year and our capital stock must be beneficially owned by 100 or more persons during at least 335 days of a taxable year of 12 months or during a proportionate part of a shorter taxable year. To satisfy the above ownership requirements and other requirements for qualification as a REIT, our charter contains certain provisions restricting the ownership or acquisition of shares of our capital stock. These restrictions on ownership and acquisition of shares of our capital stock provide, among other things, that subject to certain exceptions, no stockholder may own, or be deemed to own by virtue of certain attribution provisions of the Code, more than 9.0% of the lesser of the aggregate number or value of our outstanding shares of common stock.

These restrictions will not preclude settlement of transactions through the NYSE.

Transfer Agent and Registrar

The transfer agent and registrar for the common stock is Computershare Shareowner Services LLC.

Certain Anti-Takeover Provisions of Maryland Law

Business Combinations

Under the MGCL, certain "business combinations" (including a merger, consolidation, share exchange or, in certain circumstances, an asset transfer or issuance or transfer of equity securities or reclassification of equity securities) between a Maryland corporation and any person who beneficially owns, directly or indirectly, 10% or more of the voting power of the corporation or an affiliate of the corporation who, at any time within the two-year period immediately prior to the date in

question, was the beneficial owner, directly or indirectly, of 10% or more of the voting power of the then-outstanding voting stock of the corporation, in each case referred to as an interested stockholder, or an affiliate of such an interested stockholder, are prohibited for five years after the most recent date on which the interested stockholder becomes an interested stockholder. Thereafter, any such business combination must be recommended by the board of directors of such corporation and approved by the affirmative vote of at least (a) 80% of the votes entitled to be cast by holders of outstanding shares of voting stock of the corporation and (b) two-thirds of the votes entitled to be cast by holders of voting stock of the corporation other than shares of voting stock held by the interested stockholder with whom (or with whose affiliate) the business combination is to be effected or held by an affiliate or associate of the interested stockholder, unless, among other conditions, the corporation's common stockholders receive a minimum price (as defined in the MGCL) for their shares and the consideration is received in cash or in the same form as previously paid by the interested stockholder for its shares. These provisions of the MGCL do not apply, however, to business combinations that are approved or exempted by a board of directors prior to the time that the interested stockholder becomes an interested stockholder. A person is not an interested stockholder under the statute if the board of directors approved in advance the transaction by which the person otherwise would have become an interested stockholder.

Our board of directors may provide that its approval is subject to compliance with any terms and conditions determined by it. However, pursuant to the statute, our board of directors has by resolution opted out of these provisions of the MGCL and, consequently, the five-year prohibition and the super-majority vote requirements will not apply to business combinations between us and any interested stockholder of our company. As a result, anyone who later becomes an interested stockholder may be able to enter into business combinations with us that may not be in the best interest of our stockholders without compliance by our company with the super-majority vote requirements and the other provisions of the statute. However, no assurances can be given that such resolution will not be modified, amended or revoked in the future or that the provisions of the MGCL relative to business combinations will not be reinstated or again become applicable to us.

Control Share Acquisitions

The MGCL provides that holders of "control shares" of a Maryland corporation acquired in a "control share acquisition" have no voting rights with respect to the control shares except to the extent approved at a special meeting of stockholders by the affirmative vote of two-thirds of the votes entitled to be cast on the matter, excluding shares of stock in a corporation in respect of which any of the following persons is entitled to exercise or direct the exercise of the voting power of shares of stock of the corporation in the election of directors: (i) a person who makes or proposes to make a control share acquisition, (ii) an officer of the corporation or (iii) an employee of the corporation who is also a director of the corporation. "Control shares" are voting shares of stock which, if aggregated with all other such shares of stock owned by the acquiror or in respect of which the acquiror is able to exercise or direct the exercise of voting power (except solely by virtue of a revocable proxy), would entitle the acquiror, directly or indirectly, to exercise or direct the exercise of, voting power in electing directors within one of the following ranges of voting power: (i) one-tenth or more but less than one-third, (ii) one-third or more but less than a majority, or (iii) a majority or more of all voting power. Control shares do not include shares the acquiring person is then entitled to vote as a result of having previously obtained stockholder approval. A "control share acquisition" means the acquisition, directly or indirectly, of control shares, subject to certain exceptions.

A person who has made or proposes to make a control share acquisition, upon satisfaction of certain conditions (including an undertaking to pay expenses), may compel our board of directors to call a special meeting of stockholders to be held within 50 days of demand to consider the voting rights of the shares. If no request for a meeting is made, the corporation may itself present the question at any stockholders meeting.

If voting rights are not approved at the meeting or if the acquiring person does not deliver an acquiring person statement as required by the statute, then, subject to certain conditions and limitations, the corporation may redeem any or all of the control shares (except those for which voting rights have previously been approved) for fair value determined, without regard to the absence of voting rights for the control shares, as of the date of the last control share acquisition by the acquiror or of any meeting of stockholders at which the voting rights of such shares are considered and not approved. If voting rights for control shares are approved at a stockholders meeting and the acquiror becomes entitled to vote a majority of the shares entitled to vote, all other stockholders may exercise appraisal rights. The fair value of the shares as determined for purposes of such appraisal rights may not be less than the highest price per share paid by the acquiror in the control share acquisition.

The control share acquisition statute does not apply (a) to shares acquired in a merger, consolidation or share exchange if the corporation is a party to the transaction or (b) to acquisitions approved or exempted by the charter or bylaws of the corporation.

Our bylaws contain a provision exempting from the control share acquisition statute any and all acquisitions by any person of shares of our stock. There can be no assurance that this provision will not be amended or eliminated at any time in the future.

Subtitle 8

Subtitle 8 of Title 3 of the MGCL permits a Maryland corporation with a class of equity securities registered under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and at least three independent directors to elect to be subject, by provision in its charter or bylaws or a resolution of its board of directors and notwithstanding any contrary provision in the charter or bylaws, to any or all of the following five provisions:

•a classified board;

•a two-thirds vote requirement for removing a director;

•a requirement that the number of directors be fixed only by vote of the directors;

•a requirement that a vacancy on the board be filled only by the remaining directors and for the remainder of the full term of the class of directors in which the vacancy occurred; and

•a majority requirement for the calling of a special meeting of stockholders.

Our bylaws provide, and we have elected to be subject to the provision of Subtitle 8 that requires, that a vacancy on the board be filled only by the remaining directors and for the remainder of the full term of the class of directors in which the vacancy occurred. Through provisions in our charter and bylaws unrelated to Subtitle 8, we also vest in the board the exclusive power to fix the number of directorships. If we made an election to be subject to the provision of Subtitle 8 relating to a classified board, our board of directors would automatically be classified into three classes with staggered terms of office of three years each. In such instance, the classification and staggered terms of office of the directors would make it more difficult for a third party to gain control of the board of directors since at least two annual meetings of stockholders, instead of one, generally would be required to effect a change in the majority of the board of directors.

Anti-Takeover Effect of Certain Provisions of Maryland Law

The business combination provisions, the control share acquisition provisions and Subtitle 8 of the MGCL, and certain other provisions of our charter and bylaws, could delay, defer or prevent a transaction or a change in control of our company that might involve a premium price for holders of securities or otherwise be in their best interests.

DESCRIPTION OF SERIES I PREFERRED STOCK

The following is a summary of certain general terms of our preferred stock and certain provisions of the articles supplementary creating our Series I Preferred Stock. This description is subject to and qualified in its entirety by reference to SL Green's charter, which includes the articles supplementary relating to each series of preferred stock, and SL Green's bylaws, as amended, each of which has previously been filed with the SEC, and the MGCL. As used in this section, the terms "we," "us" or "our" refer to SL Green Realty Corp. and not any of its subsidiaries.

General

Our charter provides that we may issue up to 25,000,000 shares of preferred stock, $0.01 par value per share which may be classified and designated in one or more series by our board of directors. As of December 31, 2023, there were 9,200,000 shares of preferred stock outstanding, consisting of shares of 6.50% Series I Preferred Stock. Company to provide updated share amounts.

The issuance of preferred stock could adversely affect the voting power, dividend rights and other rights of holders of common stock. Our board of directors could establish another series of preferred stock that could, depending on the terms of the series, delay, defer or prevent a transaction or a change in control of our company that might involve a premium price for the common stock or otherwise be in the best interest of the holders thereof. Management believes that the availability of preferred stock will provide us with increased flexibility in structuring possible future financings and acquisitions and in meeting other needs that might arise.

Listing

The Series I Preferred Stock is listed on the NYSE under the symbol "SLG.PRI."

Maturity

The Series I Preferred Stock has no stated maturity and is not subject to any sinking fund or mandatory redemption. Shares of the Series I Preferred Stock will remain outstanding indefinitely unless we decide to redeem or otherwise repurchase them. We are not required to set aside funds to redeem the Series I Preferred Stock.

Ranking

The Series I Preferred Stock, with respect to rights to the payment of dividends and the distribution of assets upon our voluntary or involuntary liquidation, dissolution or winding up, ranks (a) senior to our common stock and all other classes or series of our capital stock issued in the future, the terms of which specifically provide that such class or series of capital stock ranks junior to the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up, (b) on a parity with all other classes or series of our capital stock issued in the future, other than those referred to in clauses (a) and (c), the terms of which specifically provide that such classes or series of capital stock rank on a parity with the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up, and (c) junior to all other classes or series of our capital stock issued in the future, the terms of which specifically provide that such classes or series of capital stock rank senior to the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up.

Dividends

Subject to the preferential rights of holders of any class or series of our capital stock ranking senior to the Series I Preferred Stock as to the payment of dividends, holders of Series I Preferred Stock are entitled to receive, when, if and as declared by our board of directors, out of funds legally available for the payment of quarterly cumulative preferential cash dividends, an amount per share equal to 6.50% of the $25.00 liquidation preference per annum (equivalent to a fixed annual amount of $1.625 per share), payable in equal amounts of $0.40625 per share quarterly. Dividends on the Series I Preferred Stock began to accrue and were fully cumulative starting from, and including, August 10, 2012 and are payable quarterly when, if and as authorized by our board of directors, in equal amounts in arrears on the fifteenth day of each January, April, July and October or, if not a business day, then the next succeeding business day (each, a "Dividend Payment Date"), and no interest or additional dividends or other sums will accrue on the amount so payable from the Dividend Payment Date to such next succeeding business day. Any dividend payable on the Series I Preferred Stock for any portion of a dividend period that ends prior to a Dividend Payment Date will be prorated and computed on the basis of a 360-day year consisting of twelve 30-day months. Dividends are payable to holders of record as they appear in our stock records at the close of business on the applicable

record date, which is the first day of the calendar month in which the applicable Dividend Payment Date falls or such other date designated by our board of directors that is not more than 30 nor less than 10 days prior to such Dividend Payment Date (each, a "Dividend Record Date"). Each outstanding share of Series I Preferred Stock is entitled to receive a dividend with respect to any Dividend Record Rate equal to the dividend paid with respect to each other share of Series I Preferred Stock that is outstanding on such Dividend Record Date.

No dividend on the Series I Preferred Stock can be declared or paid or set apart for payment by our board of directors if such declaration, payment or setting apart for payment would violate any of our agreements or is restricted or prohibited by law.

In the event dividends are not paid in full (or a sum sufficient for such full payment is not so set apart) upon the Series I Preferred Stock and the shares of any other class or series of our capital stock ranking on a parity as to the payment of dividends with the Series I Preferred Stock, all dividends declared upon the Series I Preferred Stock and any other class or series of capital stock ranking on a parity as to the payment of dividends with the Series I Preferred Stock are declared pro rata so that the amount of dividends declared per share of Series I Preferred Stock and such other class or series of our capital stock will in all cases bear to each other the same ratio that accumulated dividends per share on the Series I Preferred Stock and such other class or series of capital stock (which will not include any accumulation in respect of unpaid dividends for prior dividend periods if such class or series of our capital stock does not have a cumulative dividend) bear to each other. No interest, or sum of money in lieu of interest, is payable in respect of any dividend payment or payments on the Series I Preferred Stock which may be in arrears.

Except as provided in the immediately preceding paragraph, unless full cumulative dividends on the Series I Preferred Stock and any other class or series of capital stock ranking on a parity as to the payment of dividends with the Series I Preferred Stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof set apart for payment for all past dividend periods:

•no dividends will be declared or paid or set apart for payment and no other distribution of cash or other property will be declared or made (other than in shares of our common stock or other class or series of capital stock ranking on a parity with or junior to the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up) on or with respect to any shares of our common stock or shares of any other class or series of our capital stock ranking, as to the payment of dividends or the distribution of assets upon our liquidation, dissolution or winding up, on a parity with or junior to the Series I Preferred Stock; and

•no common stock or any other class or series of capital stock ranking junior to or on a parity with the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up will be redeemed, purchased or otherwise acquired for any consideration (or any money paid or made available for a sinking fund for the redemption of any such class or series of capital stock) by us (except by conversion into or exchange for any other class or series of our capital stock ranking on a parity with or junior to the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our liquidation, dissolution or winding up or by redemption, purchase or acquisition for the purpose of maintaining our qualification as a REIT).

Notwithstanding the foregoing, dividends on the Series I Preferred Stock accumulate whether or not the Company has earnings, whether or not there are funds legally available for the payment thereof, whether or not they are prohibited by the terms of the Company's or its subsidiaries' agreements and whether or not such dividends are declared. Accumulated but unpaid dividends on the Series I Preferred Stock do not bear interest and holders of the Series I Preferred Stock are not be entitled to any dividends in excess of full cumulative dividends as described above.

Holders of Series I Preferred Stock are not entitled to any dividend or other distribution, whether payable in cash, property or shares of any class or series of capital stock (including Series I Preferred Stock) in excess of the full cumulative dividends on the Series I Preferred Stock as described above. Any dividend payment made on the Series I Preferred Stock is first credited against the earliest accumulated but unpaid dividend due with respect to such shares which remain payable.

Liquidation Preference

In the event of our voluntary or involuntary liquidation, dissolution or winding up, the holders of the Series I Preferred Stock will be entitled to receive out of our assets legally available for distribution to our stockholders remaining after payment or provisions for payment of all of our debts and other liabilities, liquidating distributions, in cash or property at its fair market value as determined by our board of directors, in the amount of a liquidation preference of $25.00 per share, plus an amount equal to any accumulated dividends (whether or not earned or declared) to, but not including, the date of payment, before any

distribution of assets is made to holders of common stock or any other class or series of our capital stock ranking junior to the Series I Preferred Stock as to the distribution of assets upon our liquidation, dissolution or winding up, but subject to the preferential rights of the holders of shares of any class or series of our capital stock ranking senior to the Series I Preferred Stock as to the distribution of assets upon our liquidation, dissolution or winding up. After payment of the full amount of the liquidating distributions to which they are entitled, the holders of Series I Preferred Stock will have no right or claim to any of our remaining assets. None of (i) our consolidation or merger with or into another entity, (ii) a merger of another entity with or into us, (iii) a statutory stock exchange by us or (iv) a sale, lease or conveyance of all or substantially all of our property or business will be considered a liquidation, dissolution or winding up. If, upon our voluntary or involuntary liquidation, dissolution or winding up, our assets legally available for distribution to our stockholders are insufficient to make the full payment due to holders of the Series I Preferred Stock and the corresponding amounts payable on all outstanding shares of other classes or series of capital stock ranking on a parity with the Series I Preferred Stock as to the distribution of assets upon our liquidation, dissolution or winding up, then the holders of the Series I Preferred Stock and all other such classes or series of capital stock will share ratably in any such distribution of assets in proportion to the full liquidating distributions (including, if applicable, accumulated and accrued dividends) to which they would otherwise be respectively entitled. The liquidation preference of the outstanding shares of Series I Preferred Stock will not be added to our liabilities for the purpose of determining whether under the MGCL a distribution may be made to our stockholders whose preferential rights upon our dissolution are junior to those of holders of the Series I Preferred Stock.

Redemption

The Series I Preferred Stock is not redeemable at any time at the option of the holders thereof. The Series I Preferred Stock will not be subject to sinking fund or mandatory redemption. Since August 10, 2017, we have had the option to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at a redemption price per share of Series I Preferred Stock in cash equal to $25.00, plus (except as provided below) all dividends accumulated and unpaid (whether or not earned or authorized) on the shares of Series I Preferred Stock to, but excluding, the date of such redemption, upon giving notice as provided below. Any date fixed for redemption pursuant to the foregoing provisions is referred to as a "Series I Preferred Stock Redemption Date."

In the event of any redemption, we will provide notice by publication in a newspaper of general circulation in the City of New York, such publication to be made once a week for two successive weeks commencing not less than 30 nor more than 60 days prior to the Series I Preferred Stock Redemption Date. We will deliver, not less than 30 nor more than 60 days prior to the Series I Preferred Stock Redemption Date, to each holder of record of Series I Preferred Stock to be redeemed at such holder's address as it appears on our stock transfer records, notifying such holder of our election to redeem such shares; provided that if we have reasonably concluded, based upon the advice of independent tax counsel experienced in such matters, that any redemption must be made on a date (the "Subject Date") which is earlier than 30 days after the date of such mailing in order to preserve our status as a REIT for federal income tax purposes or to comply with federal tax laws relating to our qualification as a REIT, then we may give such shorter notice as is necessary to effect such redemption on the Subject Date. In addition to any information required by law or by the applicable rules of any exchange upon which the Series I Preferred Stock may be listed or admitted to trading, the notice of redemption will state (i) the date fixed for redemption thereof, (ii) the cash redemption price, (iii) the number of shares to be redeemed (and, if fewer than all the shares of Series I Preferred Stock are to be redeemed, the number of shares to be redeemed from such holder), (iv) the place(s) where the certificates for the shares of Series I Preferred Stock, if any, are to be surrendered for payment of the redemption price in cash, and (v) that dividends on the shares to be redeemed will cease to accumulate on such redemption date.

If we redeem fewer than all of the outstanding shares of Series I Preferred Stock, the number of shares of Series I Preferred Stock to be redeemed will be determined by our board of directors and the shares to be redeemed will be selected by our board of directors pro rata or by lot or in such other equitable manner as determined by our board of directors. If such redemption is to be by lot and as a result of such redemption any holder of Series I Preferred Stock would become a holder of a number of shares of Series I Preferred Stock in excess of the Ownership Limit described herein because such holder's shares of Series I Preferred Stock were not redeemed, or were only redeemed in part, then, except in certain instances, we will redeem the requisite number of shares of Series I Preferred Stock from such holder such that he will not hold in excess of the Ownership Limit subsequent to such redemption. In addition, we may redeem shares of Series I Preferred Stock in certain circumstances relating to the maintenance of our ability to qualify as a REIT for federal income tax purposes.

On or after the Series I Preferred Stock Redemption Date, each holder of shares of Series I Preferred Stock to be redeemed must present and surrender the certificates, if any, representing his shares of Series I Preferred Stock to us at the place designated in the applicable notice of redemption and thereupon the cash redemption price of such shares will be paid to or on the order of the person whose name appears on such certificate representing shares of Series I Preferred Stock as the owner thereof and each surrendered certificate will be canceled. If fewer than all the shares represented by any such certificate

representing shares of Series I Preferred Stock are to be redeemed, a new certificate will be issued representing the unredeemed shares. If notice of redemption has been mailed or published in accordance with notice provisions described above and if the funds necessary for such redemption have been set aside by us in trust for the benefit of the holders of the Series I Preferred Stock so called for redemption, then from and after the Series I Preferred Stock Redemption Date (unless we default in payment of the redemption price), all dividends on the shares of Series I Preferred Stock called for redemption will cease to accumulate and all rights of the holders thereof, except the right to receive the redemption price thereof (including all accumulated and unpaid dividends to the Series I Preferred Stock Redemption Date), will cease and terminate and such shares will not thereafter be transferred (except with our consent) on our books, and such shares shall not be deemed to be outstanding for any purpose whatsoever. At our election, prior to a Series I Preferred Stock Redemption Date, we may irrevocably deposit the redemption price (including accumulated and unpaid dividends) of the Series I Preferred Stock so called for redemption in trust for the holders thereof with a bank or trust company, in which case the notice to holders of the Series I Preferred Stock to be redeemed will (i) state the date of such deposit, (ii) specify the office of such bank or trust company as the place of payment of the redemption price and (iii) require such holders to surrender the certificates representing such shares, if any, at such place on or about the date fixed in such redemption notice (which may not be later than such Series I Preferred Stock Redemption Date) against payment of the redemption price (including all accumulated and unpaid dividends to such Series I Preferred Stock Redemption Date). Any interest or other earnings earned on the redemption price (including all accumulated and unpaid dividends) deposited with a bank or trust company will be paid to us. Any moneys so deposited which remain unclaimed by the holders of the shares of Series I Preferred Stock at the end of two years after the Series I Preferred Stock Redemption Date will be returned to us by such bank or trust company.

Notwithstanding the foregoing, unless full cumulative dividends on all shares of Series I Preferred Stock have been or contemporaneously are authorized, declared and paid or authorized, declared and a sum sufficient for the payment thereof set apart for payment for all past dividend periods, no shares of Series I Preferred Stock will be redeemed unless all outstanding shares of Series I Preferred Stock are simultaneously redeemed or exchanged; provided, however, that the foregoing will not prevent the purchase or acquisition of shares of Series I Preferred Stock pursuant to a purchase or exchange offer made on the same terms to holders of all outstanding shares of Series I Preferred Stock. In addition, unless full cumulative dividends on all outstanding shares of Series I Preferred Stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof set apart for payment for all past dividend periods, we will not purchase or otherwise acquire directly or indirectly any shares of Series I Preferred Stock or any shares of any other class or series of our capital stock ranking junior to or on a parity with the Series I Preferred Stock as to the payment of dividends or the distribution of our assets upon our liquidation, dissolution or winding up (except by conversion into or exchange for shares of any class or series of our capital stock ranking junior to the Series I Preferred Stock as to the payment of dividends or the distribution of our assets upon our liquidation, dissolution or winding up or by redemptions for the purposes of maintaining our qualification as a REIT).

Immediately prior to any redemption of shares of Series I Preferred Stock, we shall pay, in cash, any accumulated and unpaid dividends to but not including the Series I Preferred Stock Redemption Date, unless such Series I Preferred Stock Redemption Date falls after a Dividend Record Date and on or prior to the corresponding Dividend Payment Date, in which case each holder of Series I Preferred Stock at the close of business on such Dividend Record Date shall be entitled to receive the dividend payable on such shares on the corresponding Dividend Payment Date notwithstanding the redemption of such shares on or prior to such Dividend Payment Date. Except as provided above, we will make no payment or allowance for unpaid dividends, whether or not in arrears, on shares of Series I Preferred Stock for which a notice of redemption has been given.

Any shares of Series I Preferred Stock that we redeem will, after such redemption, have the status of authorized but unissued preferred stock, without designation as to class or series until such shares are once more designated as part of a particular class or series by our board of directors.

Conversion

Shares of Series I Preferred Stock are not convertible into, or exchangeable for, any of our other property or securities.

Voting Rights

Holders of Series I Preferred Stock do not have any voting rights, except as described below. Whenever dividends on any shares of Series I Preferred Stock are in arrears for six or more quarterly periods, whether or not such quarterly periods are consecutive, the number of directors then constituting the board will increase by two (if not already increased by reason of a similar arrearage with respect to any parity voting preferred stock) and the holders of Series I Preferred Stock (voting together as a single class with all other classes or series of our capital stock ranking on a parity with the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our voluntary or involuntary liquidation dissolution or winding up

upon which like voting rights have been conferred and are exercisable) will be entitled to vote for the election of two additional directors who will each be elected for a one-year term. Such election will be held at a special meeting of the stockholders or, in certain circumstances, at the next annual meeting of stockholders and at each subsequent annual meeting until all arrearages and the dividends on the Series I Preferred Stock and such other series of preferred stock upon which like voting rights have been conferred and are exercisable for the then current dividend period have been fully paid or have been declared and a sum sufficient for the full payment thereof has been set aside. Vacancies for directors elected by holders of Series I Preferred Stock and any other such series of preferred stock will be filled by the remaining director so elected then in office or, if there is no such remaining director, by vote of holders of a majority of the outstanding shares of Series I Preferred Stock, when they are entitled to the voting rights described above, and any other such series of preferred stock voting as a single class. A director elected by the holders of Series I Preferred Stock and any other such series of preferred stock may be removed with or without cause and only by vote of holders of a majority of the outstanding shares of Series I Preferred Stock, when they are entitled to the voting rights described above, and any other such series of preferred stock voting as a single class.

So long as any shares of Series I Preferred Stock remain outstanding, we will not, without the affirmative vote or consent of the holders of at least two-thirds of the shares of Series I Preferred Stock outstanding at the time, given in person or by proxy, either in writing or at a meeting (voting together as a single class with all other classes or series of our capital stock ranking on a parity with the Series I Preferred Stock as to the payment of dividends and the distribution of assets upon our voluntary or involuntary liquidation dissolution or winding up upon which like voting rights have been conferred and are exercisable), (i) authorize, create or issue, or increase the authorized or issued amount of, any class or series of our capital stock ranking senior to the Series I Preferred Stock with respect to the payment of dividends or the distribution of assets upon our liquidation, dissolution or winding up, or reclassify any authorized shares of our capital stock into any such class or series of our capital stock, or create, authorize or issue any obligation or security convertible or exchangeable into or evidencing the right to purchase any such class or series of our capital stock; or (ii) amend, alter or repeal the provisions of our charter (including the articles supplementary relating to the Series I Preferred Stock), whether by merger or consolidation or otherwise (an "Event"), so as to materially and adversely affect any right, preference, privilege or voting power of such Series I Preferred Stock or the holders thereof; provided, however, with respect to the occurrence of any of the Events set forth in (ii) above, so long as shares of Series I Preferred Stock remain outstanding or are converted into like securities of the surviving or resulting entity, in each case with like preference, privilege or voting power and terms thereof materially unchanged, taking into account that upon the occurrence of an Event, we may not be the surviving entity and such surviving entity may be a non-corporate entity, the occurrence of any such Event will not be deemed to materially adversely affect such rights, preferences, privileges or voting powers of holders of Series I Preferred Stock; and provided further that (x) any increase in the amount of the authorized preferred stock or the creation or issuance of any other series of preferred stock, or (y) the creation, issuance or increase in the amount of authorized shares of any other class or series of our capital stock, or (z) any increase in the amount of authorized shares of Series I Preferred Stock, in each case ranking on a parity with or junior to the Series I Preferred Stock with respect to payment of dividends and the distribution of assets upon our voluntary or involuntary liquidation, dissolution or winding up, will not be deemed to materially and adversely affect such rights, preferences, privileges or voting powers. Notwithstanding the foregoing, holders of any parity preferred stock are not entitled to vote together as a class with the holders of Series I Preferred Stock on any amendment, alteration or repeal of our charter if holders of Series I Preferred Stock are affected unequally by such amendment.

Holders of shares of Series I Preferred Stock are not entitled to vote with respect to any increase in total number of authorized shares of our common stock or preferred stock, any increase in the amount of the authorized Series I Preferred Stock or the creation or issuance of any other class or series of capital stock, or any increase in the number of authorized shares of Series I Preferred Stock or any other class or series of capital stock, in each case ranking on a parity with or junior to the Series I Preferred Stock with respect to the payment of dividends and the distribution of assets upon liquidation, dissolution or winding up.

In addition, the holders of such Series I Preferred Stock do not have any voting rights with respect to, and the consent of the holders of Series I Preferred Stock is not required for, the taking of any corporate action, including any merger or consolidation involving us or a sale of all or substantially all of our assets, regardless of the effect that such merger, consolidation or sale may have upon the powers, preferences, voting power or other rights or privileges of the Series I Preferred Stock, except as set forth in part (ii) of the second preceding paragraph. Except as expressly set forth in the articles supplementary relating to the Series I Preferred Stock, the Series I Preferred Stock does not have any relative, participatory, optional or other special voting rights and powers.

The foregoing voting provisions do not apply if, at or prior to the time when the act with respect to which such vote would otherwise be required will be effected, all outstanding shares of Series I Preferred Stock have been redeemed or called for redemption and sufficient funds shall have been deposited in trust to effect such redemption.

In any matter in which the Series I Preferred Stock may vote (as expressly provided in the articles supplementary relating to the Series I Preferred Stock), each share of the Series I Preferred Stock is entitled to one vote, except that when any other class or series of our preferred stock has the right to vote with the Series I Preferred Stock as a single class on any matter, the Series I Preferred Stock and such other class or series will have with respect to such matters one vote per each $25.00 of stated liquidation preference.

Information Rights

During any period in which we are not subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act and any Series I Preferred Stock is outstanding, we will (a) transmit by mail or other permissible means under the Exchange Act to all holders of Series I Preferred Stock as their names and addresses appear in our record books and without cost to such holders, copies of reports that are substantially similar to the Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q that we would have been required to file with the SEC pursuant to Section 13 or 15(d) of the Exchange Act if we were subject thereto (other than any exhibits that would have been required) and (b) within 15 days following written request, supply copies of such reports to any prospective holder of the Series I Preferred Stock. We will mail (or otherwise provide) the reports to the holders of Series I Preferred Stock within 15 days after the respective dates by which we would have been required to file such reports with the SEC if we were subject to Section 13 or 15(d) of the Exchange Act, based on the dates on which we would be required to file such periodic reports if we were a "non-accelerated filer" within the meaning of the Exchange Act.

Restrictions on Ownership and Transfer

For us to qualify as a REIT under the Code, not more than 50% in value of our outstanding capital stock may be owned, directly or indirectly, by five or fewer individuals, according to the definition in the Code, during the last half of a taxable year and our capital stock must be beneficially owned by 100 or more persons during at least 335 days of a taxable year of 12 months or during a proportionate part of a shorter taxable year. To satisfy the above ownership requirements and other requirements for qualification as a REIT, our charter contains certain provisions restricting the ownership or acquisition of shares of our capital stock. In addition, further restrictions were adopted prior to the issuance of the Series I Preferred Stock. The articles supplementary classifying the Series I Preferred Stock provide that no holder of Series I Preferred Stock may own, or be deemed to own by virtue of the attribution provisions of the Code, nor may any person or entity acquire shares of our Series I Preferred Stock such that he or it would own in excess of 20% (in value or in number of shares, whichever is more restrictive) of the aggregate of the outstanding shares of Series I Preferred Stock.

These restrictions will not preclude settlement of transactions through the NYSE.

Transfer Agent and Registrar

The transfer agent and registrar for the preferred stock is Computershare Shareowner Services LLC.

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF SL GREEN REALTY CORP.

Entity Name	State of Incorporation
1 Madison Office Fee LLC	Delaware
10 E 53 Owner LLC	Delaware
10E53 Partner LLC	Delaware
100 Church Fee Owner LLC	Delaware
100 Church Retail I Lessee LLC	Delaware
100 Church Retail II Lessee LLC	Delaware
107-30 Rockaway Blvd LLC	Delaware
11 MADISON AVENUE OWNER LLC	Delaware
11 Madison Investor LLC	Delaware
11 Madison Investor II LLC	Delaware
11 Madison Member LLC	Delaware
110 Greene Fee Owner LP	Delaware
11W34 Investor LLC	Delaware
11 West 34th Street Owner LLC	Delaware
101 Investor Corp.	Delaware
115 Spring Purchaser LLC	Delaware
121 GREENE RETAIL OWNER LLC	Delaware
125 Park Owner LLC (f/k/a SLG 125 Park LLC)	Delaware
126 Nassau Green Member LLC	Delaware
126 Nassau Holding LLC	Delaware
126 Nassau Lessee LLC	Delaware
126 Nassau New Sublessee LLC	Delaware
126 Nassau Sublessee LLC	Delaware
183 BROADWAY OWNER LLC	Delaware
1350 LLC	Delaware
1515 Broadway GP, LLC	Delaware
1515 Broadway Owner LP	Delaware
1515 Promote LLC	Delaware
1515 SLG Optionee LLC	Delaware
1515 SLG Private REIT LLC	Delaware
1552 Broadway Retail Owner LLC	Delaware
19E65 Owner LLC	Delaware
21E66 LT Investor LLC	Delaware
21E66 MM Investor LLC	Delaware
21E66 MM TRS LLC	Delaware
21 East 66th Street Commercial LLC	New York
220 News Asset Management LLC	Delaware
245 Park Avenue Property LLC	Delaware
245 Park Asset Management LLC	Delaware
245 Park Investor LLC	Delaware
245 Park Member LLC	Delaware
245 Park Member Sub A LLC	Delaware
33/34 West Owner LLC	Delaware
36 LLC	Delaware
304 PAS Owner LLC	Delaware

Entity Name	State of Incorporation
315 W 36 Member LLC	Delaware
360 Asset Manager LLC	Delaware
360 Investment LLC	Delaware
360 Property Manager LLC	Delaware
450 Park Asset Management LLC	Delaware
450 GP LLC	Delaware
450 Park Fee Owner LP	Delaware
461 FIFTH HOLDING LLC	Delaware
461 FIFTH OWNER LLC	Delaware, New York
461 FIFTH INVESTOR LLC	Delaware
5 TS Investor Member LLC	Delaware
540W21 Asset Management LLC	Delaware
540W21 Funding LLC	Delaware
50 East 72 Owner LLC	Delaware
625 MAD Realty LLC	Delaware
625 Participation LLC	Delaware
650 Fifth Lessee LLC	Delaware
690 Madison Holding LLC	Delaware
690 Madison Owner LLC	Delaware
711 Mortgage Manager Corp.	Delaware
719 Seventh Owner LLC	Delaware
719 Seventh TIC 1 Owner LLC	Delaware
719 Seventh TIC 2 Owner LLC	Delaware
747 Madison Retail Owner LLC	Delaware
750 Third Owner LLC (f/k/a GREEN 750 THIRD OWNER LLC)	Delaware
752 Development Fee LLC	Delaware
760 Resi Member Corp.	Delaware
760 Retail Member LLC	Delaware
85 Fifth Avenue Retail Owner LLC	Delaware
85 FIFTH GREEN MEMBER LLC	Delaware
762 Madison Owner LLC	Delaware
800 Third Avenue Associates, LLC	Delaware
885 3rd Avenue Fee- Leasehold JV LLC	Delaware, New York
885 3rd Avenue Master Lessee LLC	Delaware
919 Ground Lease LLC	Delaware
919 Ground Lease Member LLC	Delaware
919 MEMBER LLC	Delaware
985 Third Development LLC	Delaware
Casino TRS Corp.	Delaware
Coalition Support Base LLC	Delaware
Concept Space LLC	Delaware
eEMERGE, Inc	Delaware, New York
Galleria City Holding Company LLC	Delaware
Galleria City GP Member LLC	Delaware
Galleria City LP Member LLC	Delaware
Green 121 Member LLC	Delaware
Green 141 Fifth Participation Corp.	Delaware
Green 155 Member LLC	Delaware

Entity Name	State of Incorporation
Green 1552 Member LLC	Delaware
Green 1604 Investment LLC	Delaware
Green 461 Fifth Lessee LLC	Delaware, New York
Green 485 Mezz LLC	Delaware
Green 485 Owner LLC	Delaware
Green 650 Member LLC	Delaware
Green 711 LM LLC	New York
Green 724 Member LLC	Delaware
Green 747 Member LLC	Delaware
Green 800 Third Interest LLC	Delaware
Green 800 Third Member LLC	Delaware
GREEN BROADWAY/34 INVESTMENT LLC	Delaware
Green Loan Services LLC	Delaware
GREEN W. 57TH ST., LLC	New York
Herald Square Acquisition LLC	Delaware
Herald Square GP LLC	Delaware
Herald Square Owner LLC	Delaware
Hospitality TRS Corp	Delaware
Landmark Square 1-6 LLC	Delaware
Landmark Square 1-6 Mezz LLC	Delaware
Meadow Funding Corp.	Delaware
METROPOLITAN PARTNERS LLC	Delaware
METROPOLITAN 919 3RD AVENUE LLC	Delaware
OMA Commons LLC	Delaware
OMA Developer LLC	Delaware
OMA Investment GP LLC	Delaware
OMA Promote Member LLC	Delaware
OMA Restaurant LLC	Delaware
OMA Rooftop LLC	Delaware
One Vanderbilt Owner LLC	Delaware
One Vanderbilt PI LLC	Delaware
OVA Cafe Mezz LLC	Delaware
OVA Developer LLC	Delaware
OVA REIT Manager LLC	Delaware
OVA Restaurant Mezz LLC	Delaware
OVA Sushi Mezz LLC	Delaware
Palisades Fee Owner LLC	Delaware
Palisades Member LLC	Delaware
Reckson Mezzanine Corp.	New York
RECKSON OPERATING PARTNERSHIP, L.P.	Delaware
RXR 5TS Owner LLC	Delaware
S.L. Green Management Corp.	New York
SL Green 100 Park LLC	New York
SL Green Funding LLC*	New York
SL Green Investor LLC	Delaware
SL Green Management LLC	Delaware, New York
SL Green Operating Partnership, L.P.	Delaware, New York
SL Green Realty Acquisition LLC	Delaware, New York

Entity Name	State of Incorporation
SL Green Servicing Corp.	Delaware
SLG 100 Park LLC	Delaware
SLG 125 Park Mezz LLC	Delaware
SLG 1185 Sixth A LLC	Delaware
SLG 1515 Broadway Finance LLC	Delaware
SLG 220 NEWS LESSEE LLC	Delaware
SLG 220 News Owner LLC	Delaware, New York
SLG 625 Lessee LLC	Delaware
SLG 711 Fee LLC	New York
SLG 711 Third LLC	New York
SLG 711 Third Sublandlord LLC	Delaware
SLG 717 FIFTH MEMBER LLC	Delaware
SLG 810 Seventh Lessee LLC	Delaware
SLG 885 Third Manager LLC	Delaware
SLG Asset Management Fee LLC	Delaware, New York
SLG Elevator Holdings LLC	New York
SLG Funding REIT LLC*	Delaware
SLG Gramercy Services LLC	Delaware
SLG Graybar LLC	Delaware
SLG Graybar Mesne Lease Corp	New York
SLG Graybar Mesne Lease I LLC	Delaware
SLG Graybar Mesne Lease LLC	New York
SLG Graybar New Ground Lessee LLC	Delaware
SLG Graybar New Lessee LLC	Delaware
SLG Graybar Sublease Corp	New York
SLG Graybar Sublease LLC	New York
SLG IRP Realty LLC	New York
SLG LeaseCo Member LLC	Delaware
SLG Lightpath LLC	Delaware
SLG MADISON INVESTMENT LLC	Delaware
SLG One Park Shareholder LLC	Delaware
SLG One Park Shareholder II LLC	Delaware
SLG One Park Shareholder III LLC	Delaware
SLG OpCo Holdings LLC	Delaware
SLG OpCo Member LLC	Delaware
SLG Park Avenue Investor LLC	Delaware
SLG Protective TRS Corp	Delaware, New York
SLG RSVP Member LLC	Delaware
SLG SHP Holding LLC	Delaware
SP West 33-34 Hotel Parcel LLC	Delaware
Structured Finance TRS Corp.	Delaware
SubCo Holding LLC	Delaware
Summit Manager Mezzanine Corp.	Delaware
Summit OVA Tenant LLC	Delaware
Summit Observatory Investor LLC	Delaware
Studio City EQX Sublessor LLC	Delaware
WWP MEMBER LLC	Delaware
WWP Office LLC	Delaware

* The purpose of this entity is to engage in debt and preferred equity finance investments through various wholly-owned subsidiaries which are not included on this list.

EX-21.2

Exhibit 21.2

SUBSIDIARIES OF SL GREEN OPERATING PARTNERSHIP, L.P.

Entity Name	State of Incorporation
1 Madison Office Fee LLC	Delaware
10 E 53 Owner LLC	Delaware
10E53 Partner LLC	Delaware
100 Church Fee Owner LLC	Delaware
100 Church Retail I Lessee LLC	Delaware
100 Church Retail II Lessee LLC	Delaware
107-30 Rockaway Blvd LLC	Delaware
11 MADISON AVENUE OWNER LLC	Delaware
11 Madison Investor LLC	Delaware
11 Madison Investor II LLC	Delaware
11 Madison Member LLC	Delaware
110 Greene Fee Owner LP	Delaware
11W34 Investor LLC	Delaware
11 West 34th Street Owner LLC	Delaware
101 Investor Corp.	Delaware
115 Spring Purchaser LLC	Delaware
121 GREENE RETAIL OWNER LLC	Delaware
125 Park Owner LLC (f/k/a SLG 125 Park LLC)	Delaware
126 Nassau Green Member LLC	Delaware
126 Nassau Holding LLC	Delaware
126 Nassau Lessee LLC	Delaware
126 Nassau New Sublessee LLC	Delaware
126 Nassau Sublessee LLC	Delaware
183 BROADWAY OWNER LLC	Delaware
1350 LLC	Delaware
1515 Broadway GP, LLC	Delaware
1515 Broadway Owner LP	Delaware
1515 Promote LLC	Delaware
1515 SLG Optionee LLC	Delaware
1515 SLG Private REIT LLC	Delaware
1552 Broadway Retail Owner LLC	Delaware
19E65 Owner LLC	Delaware
21E66 LT Investor LLC	Delaware
21E66 MM Investor LLC	Delaware
21E66 MM TRS LLC	Delaware
21 East 66th Street Commercial LLC	New York
220 News Asset Management LLC	Delaware
245 Park Avenue Property LLC	Delaware
245 Park Asset Management LLC	Delaware
245 Park Investor LLC	Delaware
245 Park Member LLC	Delaware
245 Park Member Sub A LLC	Delaware

Entity Name	State of Incorporation
33/34 West Owner LLC	Delaware
36 LLC	Delaware
304 PAS Owner LLC	Delaware
315 W 36 Member LLC	Delaware
360 Asset Manager LLC	Delaware
360 Investment LLC	Delaware
360 Property Manager LLC	Delaware
450 Park Asset Management LLC	Delaware
450 GP LLC	Delaware
450 Park Fee Owner LP	Delaware
461 FIFTH HOLDING LLC	Delaware
461 FIFTH OWNER LLC	Delaware, New York
461 FIFTH INVESTOR LLC	Delaware
5 TS Investor Member LLC	Delaware
540W21 Asset Management LLC	Delaware
540W21 Funding LLC	Delaware
50 East 72 Owner LLC	Delaware
625 MAD Realty LLC	Delaware
625 Participation LLC	Delaware
650 Fifth Lessee LLC	Delaware
690 Madison Holding LLC	Delaware
690 Madison Owner LLC	Delaware
711 Mortgage Manager Corp.	Delaware
719 Seventh Owner LLC	Delaware
719 Seventh TIC 1 Owner LLC	Delaware
719 Seventh TIC 2 Owner LLC	Delaware
747 Madison Retail Owner LLC	Delaware
750 Third Owner LLC (f/k/a GREEN 750 THIRD OWNER LLC)	Delaware
752 Development Fee LLC	Delaware
760 Resi Member Corp.	Delaware
760 Retail Member LLC	Delaware
85 Fifth Avenue Retail Owner LLC	Delaware
85 FIFTH GREEN MEMBER LLC	Delaware
762 Madison Owner LLC	Delaware
800 Third Avenue Associates, LLC	Delaware
885 3rd Avenue Fee- Leasehold JV LLC	Delaware, New York
885 3rd Avenue Master Lessee LLC	Delaware
919 Ground Lease LLC	Delaware
919 Ground Lease Member LLC	Delaware
919 MEMBER LLC	Delaware
985 Third Development LLC	Delaware
Casino TRS Corp.	Delaware
Coalition Support Base LLC	Delaware
Concept Space LLC	Delaware
eEMERGE, Inc	Delaware, New York
Galleria City Holding Company LLC	Delaware

Entity Name	State of Incorporation
Galleria City GP Member LLC	Delaware
Galleria City LP Member LLC	Delaware
Green 121 Member LLC	Delaware
Green 141 Fifth Participation Corp.	Delaware
Green 155 Member LLC	Delaware
Green 1552 Member LLC	Delaware
Green 1604 Investment LLC	Delaware
Green 461 Fifth Lessee LLC	Delaware, New York
Green 485 Mezz LLC	Delaware
Green 485 Owner LLC	Delaware
Green 650 Member LLC	Delaware
Green 711 LM LLC	New York
Green 724 Member LLC	Delaware
Green 747 Member LLC	Delaware
Green 800 Third Interest LLC	Delaware
Green 800 Third Member LLC	Delaware
GREEN BROADWAY/34 INVESTMENT LLC	Delaware
Green Loan Services LLC	Delaware
GREEN W. 57TH ST., LLC	New York
Herald Square Acquisition LLC	Delaware
Herald Square GP LLC	Delaware
Herald Square Owner LLC	Delaware
Hospitality TRS Corp	Delaware
Landmark Square 1-6 LLC	Delaware
Landmark Square 1-6 Mezz LLC	Delaware
Meadow Funding Corp.	Delaware
METROPOLITAN PARTNERS LLC	Delaware
METROPOLITAN 919 3RD AVENUE LLC	Delaware
OMA Commons LLC	Delaware
OMA Developer LLC	Delaware
OMA Investment GP LLC	Delaware
OMA Promote Member LLC	Delaware
OMA Restaurant LLC	Delaware
OMA Rooftop LLC	Delaware
One Vanderbilt Owner LLC	Delaware
One Vanderbilt PI LLC	Delaware
OVA Cafe Mezz LLC	Delaware
OVA Developer LLC	Delaware
OVA REIT Manager LLC	Delaware
OVA Restaurant Mezz LLC	Delaware
OVA Sushi Mezz LLC	Delaware
Palisades Fee Owner LLC	Delaware
Palisades Member LLC	Delaware
Reckson Mezzanine Corp.	New York
RECKSON OPERATING PARTNERSHIP, L.P.	Delaware
RXR 5TS Owner LLC	Delaware

Entity Name	State of Incorporation
S.L. Green Management Corp.	New York
SL Green 100 Park LLC	New York
SL Green Funding LLC*	New York
SL Green Investor LLC	Delaware
SL Green Management LLC	Delaware, New York
SL Green Realty Acquisition LLC	Delaware, New York
SL Green Servicing Corp.	Delaware
SLG 100 Park LLC	Delaware
SLG 125 Park Mezz LLC	Delaware
SLG 1185 Sixth A LLC	Delaware
SLG 1515 Broadway Finance LLC	Delaware
SLG 220 NEWS LESSEE LLC	Delaware
SLG 220 News Owner LLC	Delaware, New York
SLG 625 Lessee LLC	Delaware
SLG 711 Fee LLC	New York
SLG 711 Third LLC	New York
SLG 711 Third Sublandlord LLC	Delaware
SLG 717 FIFTH MEMBER LLC	Delaware
SLG 810 Seventh Lessee LLC	Delaware
SLG 885 Third Manager LLC	Delaware
SLG Asset Management Fee LLC	Delaware, New York
SLG Elevator Holdings LLC	New York
SLG Funding REIT LLC*	Delaware
SLG Gramercy Services LLC	Delaware
SLG Graybar LLC	Delaware
SLG Graybar Mesne Lease Corp	New York
SLG Graybar Mesne Lease I LLC	Delaware
SLG Graybar Mesne Lease LLC	New York
SLG Graybar New Ground Lessee LLC	Delaware
SLG Graybar New Lessee LLC	Delaware
SLG Graybar Sublease Corp	New York
SLG Graybar Sublease LLC	New York
SLG IRP Realty LLC	New York
SLG LeaseCo Member LLC	Delaware
SLG Lightpath LLC	Delaware
SLG MADISON INVESTMENT LLC	Delaware
SLG One Park Shareholder LLC	Delaware
SLG One Park Shareholder II LLC	Delaware
SLG One Park Shareholder III LLC	Delaware
SLG OpCo Holdings LLC	Delaware
SLG OpCo Member LLC	Delaware
SLG Park Avenue Investor LLC	Delaware
SLG Protective TRS Corp	Delaware, New York
SLG RSVP Member LLC	Delaware
SLG SHP Holding LLC	Delaware
SP West 33-34 Hotel Parcel LLC	Delaware

Entity Name	State of Incorporation
Structured Finance TRS Corp.	Delaware
SubCo Holding LLC	Delaware
Summit Manager Mezzanine Corp.	Delaware
Summit OVA Tenant LLC	Delaware
Summit Observatory Investor LLC	Delaware
Studio City EQX Sublessor LLC	Delaware
WWP MEMBER LLC	Delaware
WWP Office LLC	Delaware

* The purpose of this entity is to engage in debt and preferred equity finance investments through various wholly-owned subsidiaries which are not included on this list.

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(i)      Registration Statement (Form S-3 Nos. 333-70111, 333-30394, 333‑62434, 333-126058, 333-253652 and 333-261729) of SL Green Realty Corp. and the related Prospectuses,

(ii)     Registration Statement (Form S-8 Nos. 333-127014, 333-143721, 333-189362, 333-212108 and 333-265707) pertaining to the Stock Option and Incentive Plans of SL Green Realty Corp., and

(iii)     Registration Statement (Form S-8 No. 333-148973) pertaining to the 2008 Employee Stock Purchase Plan of SL Green Realty Corp.;

of our reports dated February 23, 2024, with respect to the consolidated financial statements of SL Green Realty Corp. and the effectiveness of internal control over financial reporting of SL Green Realty Corp. included in this Annual Report (Form 10-K) of SL Green Realty Corp. for the year ended December 31, 2023.

/s/ Ernst & Young LLP

New York, New York

February 23, 2024

EX-23.2

Exhibit 23.2

Consent of Independent Registered Public Accounting Firm

    We consent to the incorporation by reference in the Registration Statement (Form S-3 No. 333-261729) of SL Green Operating Partnership, L.P. and in the related Prospectus of our reports dated February 23, 2024, with respect to the consolidated financial statements of SL Green Operating Partnership, L.P. and the effectiveness of internal control over financial reporting of SL Green Operating Partnership, L.P. included in this Annual Report (Form 10-K) for the year ended December 31, 2023.

/s/ Ernst & Young LLP

New York, New York

February 23, 2024

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Marc Holliday, certify that:

1.I have reviewed this annual report on Form 10-K of SL Green Realty Corp. (the “registrant”);

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 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 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 23, 2024
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Matthew J. DiLiberto, certify that:

1.I have reviewed this annual report on Form 10-K of SL Green Realty Corp. (the “registrant”);

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 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 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 23, 2024
	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION

I, Marc Holliday, certify that:

1.I have reviewed this annual report on Form 10-K of SL Green Operating Partnership, L.P. (the “registrant”);

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 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 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 23, 2024
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and Chief Executive Officer
	of SL Green Realty Corp., the
	general partner of the registrant

EX-31.4

Exhibit 31.4

CERTIFICATION

I, Matthew J. DiLiberto, certify that:

1.I have reviewed this annual report on Form 10-K of SL Green Operating Partnership, L.P. (the “registrant”);

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 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 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 23, 2024
	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
	of SL Green Realty Corp., the
	general partner of the registrant

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

In connection with the Annual Report of SL Green Realty Corp. (the “Company”) on Form 10-K as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Marc Holliday, Chairman and Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and Chief Executive Officer
February 23, 2024

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

In connection with the Annual Report of SL Green Realty Corp. (the “Company”) on Form 10-K as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Matthew J. DiLiberto, Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
February 23, 2024

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

In connection with the Annual Report of SL Green Operating Partnership, L.P. (the “Operating Partnership”) on Form 10-K as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Marc Holliday, Chairman and Chief Executive Officer of SL Green Realty Corp, the sole general partner of the Operating Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and Chief Executive Officer
	of SL Green Realty Corp., the
	general partner of the Operating Partnership
February 23, 2024

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

In connection with the Annual Report of SL Green Operating Partnership, L.P. (the “Operating Partnership”) on Form 10-K as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Matthew J. DiLiberto, Chief Financial Officer of SL Green Realty Corp, the sole general partner of the Operating Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
	of SL Green Realty Corp., the
	general partner of the Operating Partnership
February 23, 2024

EX-97.1

Exhibit 97.1

SL Green Realty Corp.

COMPENSATION RECOVERY POLICY

Adopted as of September 27, 2023

SL Green Realty Corp., a Maryland corporation (the “Company”), has adopted a Compensation Recovery Policy (this “Policy”) as described below.

1. Overview

The Policy sets forth the circumstances and procedures under which the Company shall recover Erroneously Awarded Compensation from Covered Persons (as defined below) in accordance with rules issued by the United States Securities and Exchange Commission (the “SEC”) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and the New York Stock Exchange. Capitalized terms used and not otherwise defined herein shall have the meanings set forth in Section 3 below.

2. Compensation Recovery Requirement

In the event the Company is required to prepare a Material Financial Restatement, the Company shall reasonably promptly recover all Erroneously Awarded Compensation with respect to such Material Financial Restatement, and each Covered Person shall be required to take all actions necessary to enable such recovery.

3. Definitions

i.“Applicable Recovery Period” means with respect to a Material Financial Restatement, the three completed fiscal years immediately preceding the Restatement Date for such Material Financial Restatement. In addition, in the event the Company has changed its fiscal year: (i) any transition period of less than nine months occurring within or immediately following such three completed fiscal years shall also be part of such Applicable Recovery Period and (ii) any transition period of nine to 12 months will be deemed to be a completed fiscal year.

ii.“Applicable Rules” means any rules or regulations adopted by the Exchange pursuant to Rule 10D-1 under the Exchange Act and any applicable rules or regulations adopted by the SEC pursuant to Section 10D of the Exchange Act.

iii.“Board” means the Board of Directors of the Company.

iv.“Committee” means the Compensation Committee of the Board or, in the absence of such committee, a majority of independent directors serving on the Board.

v.“Covered Person” means any Executive Officer. A person’s status as a Covered Person with respect to Erroneously Awarded Compensation shall be determined as of the time of receipt of such Erroneously Awarded Compensation regardless of the person’s current role or status with the Company (e.g., if a person began service as an Executive Officer after the beginning of an Applicable Recovery Period, that person would not be considered a Covered Person with respect to Erroneously Awarded Compensation received before the person began service as

an Executive Officer, but would be considered a Covered Person with respect to Erroneously Awarded Compensation received after the person began service as an Executive Officer where such person served as an Executive Officer at any time during the performance period for such Erroneously Awarded Compensation).

vi.“Effective Date” means October 2, 2023.

vii.“Erroneously Awarded Compensation” means, with respect to a Material Financial Restatement, the amount of any Incentive-Based Compensation received by a Covered Person on or after the Effective Date and during the Applicable Recovery Period that exceeds the amount that otherwise would have been received by the Covered Person had such compensation been determined based on the restated amounts in a Material Financial Restatement, computed without regard to any taxes paid. Calculation of Erroneously Awarded Compensation with respect to Incentive-Based Compensation based on stock price or total shareholder return, where the amount of Erroneously Awarded Compensation is not subject to mathematical recalculation directly from the information in a Material Financial Restatement, shall be based on a reasonable estimate of the effect of the Material Financial Restatement on the stock price or total shareholder return upon which the Incentive-Based Compensation was received, and the Company shall maintain documentation of the determination of such reasonable estimate and provide such documentation to the Exchange in accordance with the Applicable Rules.

viii.“Exchange” means the New York Stock Exchange.

ix.An “Executive Officer” means any person who served the Company in any of the following roles, received Incentive-Based Compensation after beginning service in any such role (regardless of whether such Incentive-Based Compensation was received during or after such person’s service in such role) and served in such role at any time during the performance period for such Incentive-Based Compensation: the president, principal financial officer, principal accounting officer (or if there is no such accounting officer the controller), any vice president in charge of a principal business unit, division or function (such as sales, administration or finance), any other officer who performs a policy making function, or any other person who performs similar policy making functions for the Company. Executive officers of parents or subsidiaries of the Company may be deemed executive officers of the Company if they perform such policy making functions for the Company.

x.“Financial Reporting Measures” mean measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, any measures that are derived wholly or in part from such measures (including, for example, a non-GAAP financial measure), and stock price and total shareholder return.

xi.“Incentive-Based Compensation” means any compensation provided, directly or indirectly, by the Company or any of its subsidiaries that is granted, earned, or vested based, in whole or in part, upon the attainment of a Financial Reporting Measure. Incentive-Based Compensation is deemed received, earned or vested when the Financial Reporting Measure is attained, not when the actual payment, grant or vesting occurs.

xii.A “Material Financial Restatement” means an accounting restatement of previously issued financial statements of the Company due to the material noncompliance of the Company with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously-issued financial statements that is material to the previously-issued financial statements or that would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

xiii.“Restatement Date” means, with respect to a Material Financial Restatement, the earlier to occur of: (i) the date the Board, a committee of the Board or the officer or officers of the Company authorized to take such action if Board action is not required concludes, or reasonably should have concluded, that the Company is required to prepare the Material Financial Restatement or (ii) the date a court, regulator or other legally authorized body directs the Company to prepare the Material Financial Restatement.

4. Exception to Compensation Recovery Requirement

The Company may elect not to recover Erroneously Awarded Compensation pursuant to this Policy if the Committee determines that recovery would be impracticable, and one or more of the following conditions, together with any further requirements set forth in the Applicable Rules, are met: (i) the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered, and the Company has made a reasonable attempt to recover such Erroneously Awarded Compensation; or (ii) recovery would likely cause an otherwise tax-qualified retirement plan to fail to be so qualified under applicable regulations.

5. Tax Considerations

To the extent that, pursuant to this Policy, the Company is entitled to recover any Erroneously Awarded Compensation that is received by a Covered Person, the gross amount received (i.e., the amount the Covered Person received, or was entitled to receive, before any deductions for tax withholding or other payments) shall be returned by the Covered Person.

6. Method of Compensation Recovery

The Committee shall determine, in its sole discretion, the method for recovering Erroneously Awarded Compensation hereunder, which may include, without limitation, any one or more of the following:

i.requiring reimbursement of cash Incentive-Based Compensation previously paid;

ii.seeking recovery of any gain realized on the vesting, exercise, settlement, sale, transfer or other disposition of any equity-based awards;

iii.cancelling or rescinding some or all outstanding vested or unvested equity-based awards;

iv.adjusting or withholding from unpaid compensation or other set-off;

v.cancelling or setting-off against planned future grants of equity-based awards; and/or

vi.any other method permitted by applicable law or contract.

Notwithstanding the foregoing, a Covered Person will be deemed to have satisfied such person’s obligation to return Erroneously Awarded Compensation to the Company if such Erroneously Awarded Compensation is returned in the exact same form in which it was received; provided that equity withheld to satisfy tax obligations will be deemed to have been received in cash in an amount equal to the tax withholding payment made.

7. Policy Interpretation

This Policy shall be interpreted in a manner that is consistent with the Applicable Rules and any other applicable law and shall otherwise be interpreted (including in the determination of amounts recoverable) in the business judgment of the Committee. To the extent the Applicable Rules require recovery of Incentive-Based Compensation in additional circumstances besides those specified above, nothing in this Policy shall be deemed to limit or restrict the right or obligation of the Company to recover Incentive-Based Compensation to the fullest extent required by the Applicable Rules. This Policy shall be deemed to be automatically amended, as of the date the Applicable Rules become effective with respect to the Company, to the extent required for this Policy to comply with the Applicable Rules.

8. Policy Administration

This Policy shall be administered by the Committee. Upon any accounting restatement of previously issued financial statements of the Company, whether or not such accounting restatement constitutes a Material Financial Restatement, the principal financial officer of the Company (or, in lieu thereof, any other individual serving as an executive officer of the Company at the time of the accounting restatement) shall notify the Committee that the accounting restatement has occurred. The Committee shall have such powers and authorities related to the administration of this Policy as are consistent with the governing documents of the Company and applicable law. The Committee shall have full power and authority to take, or direct the taking of, all actions and to make all determinations required or provided for under this Policy and shall have full power and authority to take, or direct the taking of, all such other actions and make all such other determinations not inconsistent with the specific terms and provisions of this Policy that the Committee deems to be necessary or appropriate to the administration of this Policy. The interpretation and construction by the Committee of any provision of this Policy and all determinations made by the Committee under this policy shall be final, binding and conclusive.

9. Compensation Recovery Repayments not Subject to Indemnification

Notwithstanding anything to the contrary set forth in any agreement with, or the organizational documents of, the Company or any of its subsidiaries, Covered Persons are not entitled to indemnification for Erroneously Awarded Compensation recovered under this Policy and, to the extent any such agreement or organizational document purports to provide otherwise, Covered Persons hereby irrevocably agree to forego such indemnification.

XML

Cover Page - USD ($)
$ in Billions

12 Months Ended

Dec. 31, 2023

Feb. 22, 2024

Jun. 30, 2023

Document Information [Line Items]

Document Type

10-K

Document Annual Report

true

Current Fiscal Year End Date

--12-31

Document Period End Date

Dec. 31, 2023

Document Transition Report

false

Entity File Number

1-13199

Entity Registrant Name

SL GREEN REALTY CORP

Entity Incorporation, State or Country Code

MD

Entity Tax Identification Number

13-3956775

Entity Address, Address Line One

One Vanderbilt Avenue

Entity Address, City or Town

New York

Entity Address, State or Province

NY

Entity Address, Postal Zip Code

10017

City Area Code

212

Local Phone Number

594-2700

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

Document Financial Statement Error Correction Flag

false

Entity Shell Company

false

Entity Public Float

$ 1.7

Entity Common Stock, Shares Outstanding

64,799,013

Documents Incorporated by Reference

Portions of the SL Green Realty Corp.'s Proxy Statement for its 2024 Annual Stockholders' Meeting to be filed within 120 days after the end of the Registrant's fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K.

Entity Central Index Key

0001040971

Document Fiscal Year Focus

2023

Document Fiscal Period Focus

FY

Amendment Flag

false

Common Stock

Document Information [Line Items]

Trading Symbol

SLG

Title of 12(b) Security

Common Stock, $0.01 par value

Security Exchange Name

NYSE

Preferred Stock

Document Information [Line Items]

Trading Symbol

SLG.PRI

Title of 12(b) Security

6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value

Security Exchange Name

NYSE

SL Green Operating Partnership

Document Information [Line Items]

Current Fiscal Year End Date

--12-31

Entity File Number

33-167793-02

Entity Registrant Name

SL GREEN OPERATING PARTNERSHIP, L.P.

Entity Incorporation, State or Country Code

DE

Entity Tax Identification Number

13-3960938

Entity Well-known Seasoned Issuer

No

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

Entity Shell Company

false

Entity Common Stock, Shares Outstanding

306,110

Entity Central Index Key

0001492869

Document Fiscal Year Focus

2023

Document Fiscal Period Focus

FY

Amendment Flag

false

XML

Audit Information	12 Months Ended
	Dec. 31, 2023
Auditor [Line Items]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	New York, New York
SL Green Operating Partnership
Auditor [Line Items]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	New York, New York

XML

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Commercial real estate properties, at cost:
Land and land interests		$ 1,092,671	$ 1,576,927
Building and improvements		3,655,624	4,903,776
Building leasehold and improvements		1,354,569	1,691,831
Right of use asset - operating leases		953,236	1,026,265
Total commercial real estate properties, at cost		7,056,100	9,198,799
Less: accumulated depreciation		(2,035,311)	(2,039,554)
Total commercial real estate properties, net		5,020,789	7,159,245
Cash and cash equivalents		221,823	203,273
Restricted cash		113,696	180,781
Investments in marketable securities		9,591	11,240
Tenant and other receivables		33,270	34,497
Related party receivables		12,168	27,352
Deferred rents receivable		264,653	257,887
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,630 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively		346,745	623,280
Investments in unconsolidated joint ventures		2,983,313	3,190,137
Deferred costs, net		111,463	121,157
Other assets		413,670	546,945
Total assets	[1]	9,531,181	12,355,794
Liabilities
Mortgages and other loans payable, net		1,491,319	3,227,563
Revolving credit facility, net		554,752	443,217
Unsecured term loans, net		1,244,881	1,641,552
Unsecured notes, net		99,795	99,692
Accrued interest payable		17,930	14,227
Other liabilities		471,401	236,211
Accounts payable and accrued expenses		153,164	154,867
Deferred revenue		134,053	272,248
Lease liability - financing leases		105,531	104,218
Lease liability - operating leases		827,692	895,100
Dividend and distributions payable		20,280	21,569
Security deposits		49,906	50,472
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,270,704	7,260,936
Commitments and contingencies
Noncontrolling interests in Operating Partnership		238,051	269,993
Preferred units		166,501	177,943
SL Green stockholders' equity:
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2023 and 2022		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 65,786 and 65,440 issued and outstanding at December 31, 2023 and 2022, respectively (including 1,060 and 1,060 shares held in treasury at December 31, 2023 and 2022, respectively)		660	656
Additional paid-in-capital		3,826,452	3,790,358
Treasury stock at cost		(128,655)	(128,655)
Accumulated other comprehensive income		17,477	49,604
Retained (deficit) earnings		(151,551)	651,138
Total SL Green stockholders' equity		3,786,315	4,585,033
Noncontrolling interests in other partnerships		69,610	61,889
Total equity		3,855,925	4,646,922
Total liabilities and equity/capital		$ 9,531,181	$ 12,355,794

[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 1,630	$ 1,811
Allowance for loan and lease losses	$ 13,520	$ 6,630
Preferred stock, par (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	65,786,000	65,440,000
Common stock, shares outstanding (in shares)	65,786,000	65,440,000
Treasury stock, shares (in shares)	1,060,000	1,060,000
Land	$ 1,092,671	$ 1,576,927
Building and improvements	3,655,624	4,903,776
Building leasehold and improvements	1,354,569	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	2,035,311	2,039,554
Other assets	413,670	546,945
Real estate debt	1,491,319	3,227,563
Accrued interest payable	17,930	14,227
Lease liabilities	105,531	104,218
Other liabilities	471,401	236,211
Service Corporation
Land	41,200	41,200
Building and improvements	40,500	41,000
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Accumulated depreciation	5,400	4,400
Other assets	676,900	599,200
Real estate debt	50,000	49,800
Lease liabilities	0	0
Other liabilities	306,500	146,400
Accrued interest payable	$ 900	$ 200
Series I Preferred Stock
Preferred stock, par (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, shares issued (in shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000

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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Rental revenue, net	$ 683,335	$ 671,500	$ 678,176
SUMMIT Operator revenue	118,260	89,048	16,311
Investment income	34,705	81,113	80,340
Other income	77,410	77,793	86,483
Total revenues	913,710	919,454	861,310
Expenses
Real estate taxes	143,757	138,228	152,835
Operating lease rent	27,292	26,943	26,554
SUMMIT Operator expenses	101,211	89,207	16,219
Interest expense, net of interest income	137,114	89,473	70,891
Amortization of deferred financing costs	7,837	7,817	11,424
SUMMIT Operator tax expense	9,201	2,647	1,000
Depreciation and amortization	247,810	216,167	216,969
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Transaction related costs	1,099	409	3,773
Marketing, general and administrative	111,389	93,798	94,912
Total expenses	990,296	838,752	764,661
Equity in net loss from unconsolidated joint ventures	(76,509)	(57,958)	(55,402)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)	(131)	(32,757)
Purchase price and other fair value adjustments	(17,260)	(8,118)	210,070
(Loss) gain on sale of real estate, net	(32,370)	(84,485)	287,417
Depreciable real estate reserves and impairments	(382,374)	(6,313)	(23,794)
Loss on early extinguishment of debt	(870)	0	(1,551)
Net (loss) income	(599,337)	(76,303)	480,632
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	37,465	5,794	(25,457)
Noncontrolling interests in other partnerships	4,568	(1,122)	1,884
Preferred units distributions	(7,255)	(6,443)	(7,305)
Net income (loss) attributable to SL Green/SLGOP	(564,559)	(78,074)	449,754
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net (loss) income attributable to SL Green common stockholders, basic	(579,509)	(93,024)	434,804
Net (loss) income attributable to SL Green common stockholders, diluted	$ (619,629)	$ (101,037)	$ 459,902
Basic (loss) earnings per share (in dollars per share)	$ (9.12)	$ (1.49)	$ 6.57
Diluted (loss) earnings per share (in dollars per share)	$ (9.12)	$ (1.49)	$ 6.50
Basic weighted average common shares outstanding (in shares)	63,809	63,917	65,740
Diluted weighted average common shares and common share equivalents outstanding (in shares)	67,972	67,929	70,769
Nonrelated party
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	$ 196,696	$ 174,063	$ 167,153

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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related party
Payments made for services	$ 5	$ 5,701	$ 12,377

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Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (599,337)	$ (76,303)	$ 480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)	103,629	21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)	(1,440)	104
Other comprehensive (loss) income	(34,087)	102,189	21,531
Comprehensive (loss) income	(633,424)	25,886	502,163
Net loss (income) attributable to noncontrolling interests and preferred units distributions	34,778	(1,771)	(30,878)
Other comprehensive loss (income) attributable to noncontrolling interests	1,960	(5,827)	(1,042)
Comprehensive income attributable to SL Green/SLGOP	$ (596,686)	$ 18,288	$ 470,243

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Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Retained (Deficit) Earnings	Noncontrolling Interests	Series I Preferred Stock Preferred Stock
Beginning balance at Dec. 31, 2020	$ 4,935,795	$ 716	$ 3,862,949	$ (124,049)	$ (67,247)	$ 1,015,462	$ 26,032	$ 221,932
Beginning balance (in shares) at Dec. 31, 2020		66,474
Increase (Decrease) in Stockholders' Equity
Net income (loss)	447,870					449,754	(1,884)
Other comprehensive income (loss)	20,489				20,489
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		11
DRSPP proceeds	738		738
Reallocation of noncontrolling interest in the Operating Partnership	(9,851)					(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		108
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	32,583	$ 2	32,581
Repurchases of common stock (in shares)		(4,474)
Repurchases of common stock	(337,624)	$ (46)	(281,206)			(56,372)
Proceeds from stock options exercised (in shares)		12
Proceeds from stock options exercised	818		818
Contributions to consolidated joint venture interests	336						336
Sale of interest in partially owned entity	(4,476)						(4,476)
Cash distributions to noncontrolling interests	(6,631)						(6,631)
Issuance of special dividend paid in stock (in shares)		1,974
Issuance of special dividend paid in stock	123,529		123,529	(2,111)		2,111
Cash distributions declared	(410,373)					(410,373)
Ending balance at Dec. 31, 2021	4,778,253	$ 672	3,739,409	(126,160)	(46,758)	975,781	13,377	221,932
Ending balance (in shares) at Dec. 31, 2021		64,105
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(76,952)					(78,074)	1,122
Acquisition of subsidiary interest from noncontrolling interest	(29,817)		(29,742)				(75)
Other comprehensive income (loss)	96,362				96,362
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		11
DRSPP proceeds	525		525
Reallocation of noncontrolling interest in the Operating Partnership	39,974					39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		274
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	32,034	$ 4	32,030
Repurchases of common stock (in shares)		(1,971)
Repurchases of common stock	(151,197)	$ (20)	(114,979)			(36,198)
Contributions to consolidated joint venture interests	52,164						52,164
Cash distributions to noncontrolling interests	(4,699)						(4,699)
Issuance of special dividend paid in stock (in shares)		1,961
Issuance of special dividend paid in stock	160,620		163,115	(2,495)
Cash distributions declared	(235,395)					(235,395)
Ending balance at Dec. 31, 2022	4,646,922	$ 656	3,790,358	(128,655)	49,604	651,138	61,889	221,932
Ending balance (in shares) at Dec. 31, 2022		64,380
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(569,127)					(564,559)	(4,568)
Other comprehensive income (loss)	(32,127)				(32,127)
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		17
DRSPP proceeds	525		525
Reallocation of noncontrolling interest in the Operating Partnership	(15,486)					(15,486)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		329
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	35,573	$ 4	35,569
Contributions to consolidated joint venture interests	15,066						15,066
Cash distributions to noncontrolling interests	(2,777)						(2,777)
Cash distributions declared	(207,694)					(207,694)
Ending balance at Dec. 31, 2023	$ 3,855,925	$ 660	$ 3,826,452	$ (128,655)	$ 17,477	$ (151,551)	$ 69,610	$ 221,932
Ending balance (in shares) at Dec. 31, 2023		64,726

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Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 3.2288	$ 3.6896	$ 6.2729

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net (loss) income	$ (599,337)	$ (76,303)	$ 480,632
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	255,647	223,984	228,393
Equity in net loss from unconsolidated joint ventures	76,509	57,958	55,402
Distributions of cumulative earnings from unconsolidated joint ventures	9,897	780	824
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	13,368	131	32,757
Purchase price and other fair value adjustments	17,260	8,118	(210,070)
Depreciable real estate reserves and impairments	382,374	6,313	23,794
Loss (gain) on sale of real estate, net	32,370	84,485	(287,417)
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Loss on early extinguishment of debt	870	0	1,551
Deferred rents receivable	(17,903)	(5,749)	(6,701)
Non-cash lease expense	20,435	22,403	17,234
Other non-cash adjustments	28,174	(5,676)	37,164
Changes in operating assets and liabilities:
Tenant and other receivables	(1,725)	14,370	(20,561)
Related party receivables	15,788	6,666	(8,727)
Deferred lease costs	(17,427)	(21,792)	(10,117)
Other assets	(1,922)	(28,204)	20,245
Accounts payable, accrued expenses, other liabilities and security deposits	11,974	(30,839)	(66,387)
Deferred revenue	8,057	18,332	(1,727)
Change in lease liability - operating leases	(11,796)	1,111	(33,241)
Net cash provided by operating activities	229,503	276,088	255,979
Investing Activities
Acquisitions of real estate property	0	(64,491)	(152,791)
Additions to land, buildings and improvements	(259,663)	(300,770)	(302,486)
Investments in unconsolidated joint ventures	(184,481)	(184,518)	(88,872)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	140,569	141,742	770,604
Net proceeds from disposition of real estate/joint venture interest	557,611	626,364	651,594
Cash and restricted cash assumed from acquisition of real estate investment	0	60,494	0
Cash assumed from consolidation of real estate investment	0	0	9,475
Proceeds from sale or redemption of marketable securities	0	15,626	4,528
Purchases of marketable securities	0	0	(10,000)
Other investments	(17,334)	1,432	40,200
Origination of debt and preferred equity investments	(65,357)	(51,367)	(95,695)
Repayments or redemption of debt and preferred equity investments	0	181,293	167,024
Net cash provided by investing activities	171,345	425,805	993,581
Financing Activities
Proceeds from mortgages and other loans payable	0	381,980	39,689
Repayments of mortgages and other loans payable	(25,826)	(292,364)	(375,044)
Proceeds from revolving credit facility, term loans and senior unsecured notes	538,000	1,524,000	1,488,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(828,000)	(1,864,000)	(1,808,000)
Proceeds from stock options exercised and DRSPP issuance	525	525	1,556
Repurchase of common stock	0	(151,197)	(341,403)
Redemption of preferred stock	(11,700)	(17,967)	(6,040)
Redemption of OP units	(9,076)	(40,901)	(25,703)
Distributions to noncontrolling interests in other partnerships	(2,777)	(4,699)	(6,631)
Contributions from noncontrolling interests in other partnerships	6,932	52,164	336
Acquisition of subsidiary interest from noncontrolling interest	0	(29,817)	0
Distributions to noncontrolling interests in the Operating Partnership	(14,779)	(16,272)	(15,749)
Dividends paid on common and preferred stock	(230,931)	(262,136)	(271,075)
Other obligation related to secured borrowing	129,656	77,874	51,862
Tax withholdings related to restricted share awards	0	(3,915)	(2,990)
Deferred loan costs	(1,407)	(8,098)	(13,745)
Principal payments on financing lease liabilities	0	0	(434)
Net cash used in financing activities	(449,383)	(654,823)	(1,285,371)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(48,535)	47,070	(35,811)
Cash, cash equivalents, and restricted cash at beginning of year	384,054	336,984	372,795
Cash, cash equivalents, and restricted cash at end of period	335,519	384,054	336,984
Supplemental cash flow disclosures:
Interest paid	229,119	169,519	152,773
Income taxes paid	7,815	5,358	4,405
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Redemption of units in the Operating Partnership for a joint venture sale	0	0	27,586
Exchange of preferred equity investment for real estate or equity in joint venture	0	190,652	0
Exchange of debt investment for real estate or equity in joint venture	349,946	193,995	9,468
Assumption of mortgage and mezzanine loans	0	1,712,750	60,000
Issuance of special dividend paid in stock	0	160,620	121,418
Tenant improvements and capital expenditures payable	0	18,518	7,580
Fair value adjustment to noncontrolling interest in the Operating Partnership	15,486	39,974	9,851
Investment in joint venture	0	47,135	0
Deconsolidation of a subsidiary	101,351	0	66,837
Deconsolidation of subsidiary debt	1,712,750	0	510,000
Debt and preferred equity investments	0	302	8,372
Transfer of assets related to assets held for sale	0	0	140,855
Transfer of liabilities related to assets held for sale	0	0	64,120
Extinguishment of debt in connection with property dispositions	0	0	53,548
Consolidation of real estate investment	0	0	119,444
Removal of fully depreciated commercial real estate properties	16,313	30,359	19,831
Sale of interest in partially owned entity	0	0	4,476
Contribution to consolidated joint venture by noncontrolling interest	8,134	0	0
Distributions to noncontrolling interests	0	0	358
Share repurchase or redemption payable	9,513	0	0
Recognition of right of use assets and related lease liabilities	0	57,938	537,344
Cash and cash equivalents	221,823	203,273	251,417
Restricted cash	113,696	180,781	85,567
Total cash, cash equivalents, and restricted cash	$ 335,519	$ 384,054	$ 336,984

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Consolidated Statements of Cash Flows (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash distribution declared, per common share (in dollars per share)	$ 3.2288	$ 3.6896	$ 6.2729
Ordinary Dividend
Cash distribution declared, per common share (in dollars per share)	$ 0.2500	$ 0.2708	0.3108
Special Dividend
Cash distribution declared, per common share (in dollars per share)			$ 2.4392

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Consolidated Balance Sheets (Partnership) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Commercial real estate properties, at cost:
Land and land interests		$ 1,092,671	$ 1,576,927
Building and improvements		3,655,624	4,903,776
Building leasehold and improvements		1,354,569	1,691,831
Right of use asset - operating leases		953,236	1,026,265
Total commercial real estate properties, at cost		7,056,100	9,198,799
Less: accumulated depreciation		(2,035,311)	(2,039,554)
Total commercial real estate properties, net		5,020,789	7,159,245
Cash and cash equivalents		221,823	203,273
Restricted cash		113,696	180,781
Investments in marketable securities		9,591	11,240
Tenant and other receivables		33,270	34,497
Related party receivables		12,168	27,352
Deferred rents receivable		264,653	257,887
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,630 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively		346,745	623,280
Investments in unconsolidated joint ventures		2,983,313	3,190,137
Deferred costs, net		111,463	121,157
Other assets		413,670	546,945
Total assets	[1]	9,531,181	12,355,794
Liabilities
Mortgages and other loans payable, net		1,491,319	3,227,563
Revolving credit facility, net		554,752	443,217
Unsecured term loans, net		1,244,881	1,641,552
Unsecured notes, net		99,795	99,692
Accrued interest payable		17,930	14,227
Other liabilities		471,401	236,211
Accounts payable and accrued expenses		153,164	154,867
Deferred revenue		134,053	272,248
Lease liability - financing leases		105,531	104,218
Lease liability - operating leases		827,692	895,100
Dividend and distributions payable		20,280	21,569
Security deposits		49,906	50,472
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,270,704	7,260,936
Commitments and contingencies
Preferred units		166,501	177,943
SL Green stockholders equity:
Accumulated other comprehensive income		17,477	49,604
Total liabilities and equity/capital		9,531,181	12,355,794
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,092,671	1,576,927
Building and improvements		3,655,624	4,903,776
Building leasehold and improvements		1,354,569	1,691,831
Right of use asset - operating leases		953,236	1,026,265
Total commercial real estate properties, at cost		7,056,100	9,198,799
Less: accumulated depreciation		(2,035,311)	(2,039,554)
Total commercial real estate properties, net		5,020,789	7,159,245
Cash and cash equivalents		221,823	203,273
Restricted cash		113,696	180,781
Investments in marketable securities		9,591	11,240
Tenant and other receivables		33,270	34,497
Related party receivables		12,168	27,352
Deferred rents receivable		264,653	257,887
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,630 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively		346,745	623,280
Investments in unconsolidated joint ventures		2,983,313	3,190,137
Deferred costs, net		111,463	121,157
Other assets		413,670	546,945
Total assets	[2]	9,531,181	12,355,794
Liabilities
Mortgages and other loans payable, net		1,491,319	3,227,563
Revolving credit facility, net		554,752	443,217
Unsecured term loans, net		1,244,881	1,641,552
Unsecured notes, net		99,795	99,692
Accrued interest payable		17,930	14,227
Other liabilities		471,401	236,211
Accounts payable and accrued expenses		153,164	154,867
Deferred revenue		134,053	272,248
Lease liability - financing leases		105,531	104,218
Lease liability - operating leases		827,692	895,100
Dividend and distributions payable		20,280	21,569
Security deposits		49,906	50,472
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	5,270,704	7,260,936
Commitments and contingencies
Limited partner interests in SLGOP (3,949 and 3,670 limited partner common units outstanding at December 31, 2023 and 2022, respectively)		238,051	269,993
Preferred units		166,501	177,943
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2023 and 2022		221,932	221,932
SL Green partners' capital (687 and 680 general partner common units, and 64,039 and 63,700 limited partner common units outstanding at December 31, 2023 and 2022, respectively)		3,546,906	4,313,497
Accumulated other comprehensive income		17,477	49,604
Total SLGOP partners' capital		3,786,315	4,585,033
Noncontrolling interests in other partnerships		69,610	61,889
Total capital		3,855,925	4,646,922
Total liabilities and equity/capital		$ 9,531,181	$ 12,355,794

[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

[2] (1) The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

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Consolidated Balance Sheets (Partnership) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 1,630	$ 1,811
Allowance for loan and lease losses	13,520	6,630
Land	1,092,671	1,576,927
Building and improvements	3,655,624	4,903,776
Building leasehold and improvements	1,354,569	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	2,035,311	2,039,554
Other assets	413,670	546,945
Real estate debt	1,491,319	3,227,563
Lease liabilities	105,531	104,218
Other liabilities	471,401	236,211
SL Green Operating Partnership
Debt and preferred equity investments, net of discounts and deferred origination fees	1,630	1,811
Allowance for loan and lease losses	$ 13,520	$ 6,630
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,949	3,670
SL Green partner's capital, general partner common units outstanding (shares)	687	680
SL Green partners' capital, limited partner common units outstanding (shares)	64,039	63,700
Land	$ 1,092,671	$ 1,576,927
Building and improvements	3,655,624	4,903,776
Building leasehold and improvements	1,354,569	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	2,035,311	2,039,554
Other assets	413,670	546,945
Real estate debt	1,491,319	3,227,563
Lease liabilities	105,531	104,218
Other liabilities	471,401	236,211
Service Corporation
Land	41,200	41,200
Building and improvements	40,500	41,000
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Accumulated depreciation	5,400	4,400
Other assets	676,900	599,200
Real estate debt	50,000	49,800
Accrued interest payable	900	200
Lease liabilities	0	0
Other liabilities	$ 306,500	$ 146,400
Series I Preferred Stock | SL Green Operating Partnership
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued (in shares)	9,200	9,200
Preferred units, shares outstanding (in shares)	9,200	9,200

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Consolidated Statements of Operations (Partnership) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Rental revenue, net	$ 683,335	$ 671,500	$ 678,176
SUMMIT Operator revenue	118,260	89,048	16,311
Investment income	34,705	81,113	80,340
Other income	77,410	77,793	86,483
Total revenues	913,710	919,454	861,310
Expenses
Real estate taxes	143,757	138,228	152,835
Operating lease rent	27,292	26,943	26,554
SUMMIT Operator expenses	101,211	89,207	16,219
Interest expense, net of interest income	137,114	89,473	70,891
Amortization of deferred financing costs	7,837	7,817	11,424
SUMMIT Operator tax expense	9,201	2,647	1,000
Depreciation and amortization	247,810	216,167	216,969
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Transaction related costs	1,099	409	3,773
Marketing, general and administrative	111,389	93,798	94,912
Total expenses	990,296	838,752	764,661
Equity in net loss from unconsolidated joint ventures	(76,509)	(57,958)	(55,402)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)	(131)	(32,757)
Purchase price and other fair value adjustments	(17,260)	(8,118)	210,070
(Loss) gain on sale of real estate, net	(32,370)	(84,485)	287,417
Depreciable real estate reserves and impairments	(382,374)	(6,313)	(23,794)
Loss on early extinguishment of debt	(870)	0	(1,551)
Net (loss) income	(599,337)	(76,303)	480,632
Net loss (income) attributable to noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in other partnerships	4,568	(1,122)	1,884
Preferred units distributions	(7,255)	(6,443)	(7,305)
Net income (loss) attributable to SL Green/SLGOP	(564,559)	(78,074)	449,754
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
Related party
Revenues
Other income		1,400	1,700
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	5	5,701	12,377
SL Green Operating Partnership
Revenues
Rental revenue, net	683,335	671,500	678,176
SUMMIT Operator revenue	118,260	89,048	16,311
Investment income	34,705	81,113	80,340
Other income	77,410	77,793	86,483
Total revenues	913,710	919,454	861,310
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	196,696	174,063	167,153
Real estate taxes	143,757	138,228	152,835
Operating lease rent	27,292	26,943	26,554
SUMMIT Operator expenses	101,211	89,207	16,219
Interest expense, net of interest income	137,114	89,473	70,891
Amortization of deferred financing costs	7,837	7,817	11,424
SUMMIT Operator tax expense	9,201	2,647	1,000
Depreciation and amortization	247,810	216,167	216,969
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Transaction related costs	1,099	409	3,773
Marketing, general and administrative	111,389	93,798	94,912
Total expenses	990,296	838,752	764,661
Equity in net loss from unconsolidated joint ventures	(76,509)	(57,958)	(55,402)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(13,368)	(131)	(32,757)
Purchase price and other fair value adjustments	(17,260)	(8,118)	210,070
(Loss) gain on sale of real estate, net	(32,370)	(84,485)	287,417
Depreciable real estate reserves and impairments	(382,374)	(6,313)	(23,794)
Loss on early extinguishment of debt	(870)	0	(1,551)
Net (loss) income	(599,337)	(76,303)	480,632
Net loss (income) attributable to noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in other partnerships	4,568	(1,122)	1,884
Preferred units distributions	(7,255)	(6,443)	(7,305)
Net income (loss) attributable to SL Green/SLGOP	(602,024)	(83,868)	475,211
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
Net (loss) income attributable to SLGOP common unitholders	$ (616,974)	$ (98,818)	$ 460,261
Basic (loss) earnings per unit (in dollars per share)	$ (9.12)	$ (1.49)	$ 6.57
Diluted (loss) earnings per unit (in dollars per share)	$ (9.12)	$ (1.49)	$ 6.50
Basic weighted average common units outstanding (in shares)		67,929	69,727
Diluted weighted average common units and common unit equivalents outstanding (in shares)	67,972	67,929	70,769
SL Green Operating Partnership | Related party
Expenses
Operating expenses, including related party expenses of $5 in 2023, $5,701 in 2022 and $12,377 in 2021	$ 5	$ 5,701	$ 12,377

XML

Consolidated Statements of Operations (Partnership) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SL Green Operating Partnership
Payments made for services	$ 196,696	$ 174,063	$ 167,153

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Consolidated Statements of Comprehensive (Loss) Income (Partnership) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net (loss) income	$ (599,337)	$ (76,303)	$ 480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)	103,629	21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)	(1,440)	104
Other comprehensive (loss) income	(34,087)	102,189	21,531
Comprehensive (loss) income	(633,424)	25,886	502,163
Net loss (income) attributable to noncontrolling interests	4,568	(1,122)	1,884
Other comprehensive loss (income) attributable to noncontrolling interests	1,960	(5,827)	(1,042)
Comprehensive income attributable to SL Green/SLGOP	(596,686)	18,288	470,243
SL Green Operating Partnership
Net (loss) income	(599,337)	(76,303)	480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)	103,629	21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)	(1,440)	104
Other comprehensive (loss) income	(34,087)	102,189	21,531
Comprehensive (loss) income	(633,424)	25,886	502,163
Net loss (income) attributable to noncontrolling interests	4,568	(1,122)	1,884
Other comprehensive loss (income) attributable to noncontrolling interests	1,960	(5,827)	(1,042)
Comprehensive income attributable to SL Green/SLGOP	$ (626,896)	$ 18,937	$ 503,005

XML

Consolidated Statements of Capital - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		$ (29,817)
DRSPP proceeds	$ 525	525	$ 738
Reallocation of noncontrolling interest in the Operating Partnership	(15,486)	39,974	(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	35,573	32,034	32,583
Repurchases of common units		(151,197)	(337,624)
Contributions to consolidated joint venture interests	15,066	52,164	336
Sale of interest in partially owned entity			(4,476)
Cash distributions to noncontrolling interests	$ (2,777)	$ (4,699)	$ (6,631)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in units)	17	11	11
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units)	329	274	108
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 4	$ 4	$ 2
Repurchases of common units (in units)		(1,971)	(4,474)
Repurchases of common units		$ (20)	$ (46)
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		(75)
Contributions to consolidated joint venture interests	15,066	52,164	336
Sale of interest in partially owned entity			(4,476)
Cash distributions to noncontrolling interests	(2,777)	(4,699)	(6,631)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning balance	4,646,922	4,778,253	4,935,795
Net income (loss)	(569,127)	(76,952)	447,870
Acquisition of subsidiary interest from noncontrolling interest		(29,817)
Other comprehensive income (loss)	(32,127)	96,362	20,489
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
DRSPP proceeds	525	525	738
Reallocation of noncontrolling interest in the Operating Partnership	(15,486)	39,974	(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	35,573	32,034	32,583
Repurchases of common units		(151,197)	(337,624)
Proceeds from stock options exercised			818
Contributions to consolidated joint venture interests	15,066	52,164	336
Cash distributions to noncontrolling interests	(2,777)	(4,699)	(6,631)
Issuance of special distribution paid in units		160,620	123,529
Cash distributions declared	(207,694)	(235,395)	(410,373)
Ending balance	3,855,925	4,646,922	4,778,253
SL Green Operating Partnership | Preferred Units | Series I Preferred Units
Increase (Decrease) in Partner's Capital
Beginning balance	221,932	221,932	221,932
Ending balance	221,932	221,932	221,932
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning balance	$ 4,313,497	$ 4,589,702	$ 4,755,078
Beginning balance (units)	64,380	64,105	66,474
Net income (loss)	$ (564,559)	$ (78,074)	$ 449,754
Acquisition of subsidiary interest from noncontrolling interest		(29,742)
Perpetual preferred unit dividends	$ (14,950)	$ (14,950)	$ (14,950)
DRSPP proceeds (in units)	17	11	11
DRSPP proceeds	$ 525	$ 525	$ 738
Reallocation of noncontrolling interest in the Operating Partnership	$ (15,486)	$ 39,974	$ (9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units)	329	274	108
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 35,573	$ 32,034	$ 32,583
Repurchases of common units (in units)		(1,971)	(4,474)
Repurchases of common units		$ (151,197)	$ (337,624)
Proceeds from stock options exercised (in units)			12
Proceeds from stock options exercised			$ 818
Issuance of special distribution paid in units (in shares)		1,961	1,974
Issuance of special distribution paid in units		$ 160,620	$ 123,529
Cash distributions declared	(207,694)	(235,395)	(410,373)
Ending balance	$ 3,546,906	$ 4,313,497	$ 4,589,702
Ending balance (units)	64,726	64,380	64,105
SL Green Operating Partnership | Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Partner's Capital
Beginning balance	$ 49,604	$ (46,758)	$ (67,247)
Other comprehensive income (loss)	(32,127)	96,362	20,489
Ending balance	17,477	49,604	(46,758)
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning balance	61,889	13,377	26,032
Net income (loss)	(4,568)	1,122	(1,884)
Acquisition of subsidiary interest from noncontrolling interest		(75)
Contributions to consolidated joint venture interests	15,066	52,164	336
Sale of interest in partially owned entity			(4,476)
Cash distributions to noncontrolling interests	(2,777)	(4,699)	(6,631)
Ending balance	$ 69,610	$ 61,889	$ 13,377

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Consolidated Statements of Capital (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash distribution declared, per common share (in dollars per unit)	$ 3.2288	$ 3.6896	$ 6.2729
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per unit)	$ 3.2288	$ 3.6896	$ 6.2729

XML

Consolidated Statements of Cash Flows (Partnership) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net (loss) income	$ (599,337)	$ (76,303)	$ 480,632
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	255,647	223,984	228,393
Equity in net loss from unconsolidated joint ventures	76,509	57,958	55,402
Distributions of cumulative earnings from unconsolidated joint ventures	9,897	780	824
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	13,368	131	32,757
Purchase price and other fair value adjustments	17,260	8,118	(210,070)
Depreciable real estate reserves and impairments	382,374	6,313	23,794
Loss (gain) on sale of real estate, net	32,370	84,485	(287,417)
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Loss on early extinguishment of debt	870	0	1,551
Deferred rents receivable	(17,903)	(5,749)	(6,701)
Non-cash lease expense	20,435	22,403	17,234
Other non-cash adjustments	28,174	(5,676)	37,164
Changes in operating assets and liabilities:
Tenant and other receivables	(1,725)	14,370	(20,561)
Related party receivables	15,788	6,666	(8,727)
Deferred lease costs	(17,427)	(21,792)	(10,117)
Other assets	(1,922)	(28,204)	20,245
Accounts payable, accrued expenses, other liabilities and security deposits	11,974	(30,839)	(66,387)
Deferred revenue	8,057	18,332	(1,727)
Change in lease liability - operating leases	(11,796)	1,111	(33,241)
Net cash provided by operating activities	229,503	276,088	255,979
Investing Activities
Acquisitions of real estate property	0	(64,491)	(152,791)
Additions to land, buildings and improvements	(259,663)	(300,770)	(302,486)
Investments in unconsolidated joint ventures	(184,481)	(184,518)	(88,872)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	140,569	141,742	770,604
Net proceeds from disposition of real estate/joint venture interest	557,611	626,364	651,594
Cash and restricted cash assumed from acquisition of real estate investment	0	60,494	0
Cash assumed from consolidation of real estate investment	0	0	9,475
Proceeds from sale or redemption of marketable securities	0	15,626	4,528
Purchases of marketable securities	0	0	(10,000)
Other investments	(17,334)	1,432	40,200
Origination of debt and preferred equity investments	(65,357)	(51,367)	(95,695)
Repayments or redemption of debt and preferred equity investments	0	181,293	167,024
Net cash provided by investing activities	171,345	425,805	993,581
Financing Activities
Proceeds from mortgages and other loans payable	0	381,980	39,689
Repayments of mortgages and other loans payable	(25,826)	(292,364)	(375,044)
Proceeds from revolving credit facility, term loans and senior unsecured notes	538,000	1,524,000	1,488,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(828,000)	(1,864,000)	(1,808,000)
Proceeds from stock options exercised and DRSPP issuance	525	525	1,556
Repurchase of common units	0	(151,197)	(341,403)
Redemption of preferred units	(11,700)	(17,967)	(6,040)
Redemption of OP units	(9,076)	(40,901)	(25,703)
Distributions to noncontrolling interests in other partnerships	(2,777)	(4,699)	(6,631)
Contributions from noncontrolling interests in other partnerships	6,932	52,164	336
Acquisition of subsidiary interest from noncontrolling interest	0	(29,817)	0
Distributions paid on common and preferred units	(230,931)	(262,136)	(271,075)
Other obligation related to secured borrowing	129,656	77,874	51,862
Tax withholdings related to restricted share awards	0	(3,915)	(2,990)
Deferred loan costs	(1,407)	(8,098)	(13,745)
Principal payments on financing lease liabilities	0	0	(434)
Net cash used in financing activities	(449,383)	(654,823)	(1,285,371)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(48,535)	47,070	(35,811)
Cash, cash equivalents, and restricted cash at beginning of year	384,054	336,984	372,795
Cash, cash equivalents, and restricted cash at end of period	335,519	384,054	336,984
Supplemental cash flow disclosures:
Interest paid	229,119	169,519	152,773
Income taxes paid	7,815	5,358	4,405
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Redemption of units in the Operating Partnership for a joint venture sale	0	0	27,586
Exchange of preferred equity investment for real estate or equity in joint venture	0	190,652	0
Exchange of debt investment for real estate or equity in joint venture	349,946	193,995	9,468
Assumption of mortgage and mezzanine loans	0	1,712,750	60,000
Tenant improvements and capital expenditures payable	0	18,518	7,580
Fair value adjustment to noncontrolling interest in the Operating Partnership	15,486	39,974	9,851
Investment in joint venture	0	47,135	0
Deconsolidation of a subsidiary	101,351	0	66,837
Deconsolidation of subsidiary debt	1,712,750	0	510,000
Debt and preferred equity investments	0	302	8,372
Transfer of assets related to assets held for sale	0	0	140,855
Transfer of liabilities related to assets held for sale	0	0	64,120
Extinguishment of debt in connection with property dispositions	0	0	53,548
Consolidation of real estate investment	0	0	119,444
Removal of fully depreciated commercial real estate properties	16,313	30,359	19,831
Sale of interest in partially owned entity	0	0	4,476
Contribution to consolidated joint venture by noncontrolling interest	8,134	0	0
Distributions to noncontrolling interests	0	0	358
Share repurchase or redemption payable	9,513	0	0
Recognition of right of use assets and related lease liabilities	0	57,938	537,344
Cash and cash equivalents	221,823	203,273	251,417
Restricted cash	113,696	180,781	85,567
Total cash, cash equivalents, and restricted cash	335,519	384,054	336,984
SL Green Operating Partnership
Operating Activities
Net (loss) income	(599,337)	(76,303)	480,632
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	255,647	223,984	228,393
Equity in net loss from unconsolidated joint ventures	76,509	57,958	55,402
Distributions of cumulative earnings from unconsolidated joint ventures	9,897	780	824
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	13,368	131	32,757
Purchase price and other fair value adjustments	17,260	8,118	(210,070)
Depreciable real estate reserves and impairments	382,374	6,313	23,794
Loss (gain) on sale of real estate, net	32,370	84,485	(287,417)
Loan loss and other investment reserves, net of recoveries	6,890	0	2,931
Loss on early extinguishment of debt	870	0	1,551
Deferred rents receivable	(17,903)	(5,749)	(6,701)
Non-cash lease expense	20,435	22,403	17,234
Other non-cash adjustments	28,174	(5,676)	37,164
Changes in operating assets and liabilities:
Tenant and other receivables	(1,725)	14,370	(20,561)
Related party receivables	15,788	6,666	(8,727)
Deferred lease costs	(17,427)	(21,792)	(10,117)
Other assets	(1,922)	(28,204)	20,245
Accounts payable, accrued expenses, other liabilities and security deposits	11,974	(30,839)	(66,387)
Deferred revenue	8,057	18,332	(1,727)
Change in lease liability - operating leases	(11,796)	1,111	(33,241)
Net cash provided by operating activities	229,503	276,088	255,979
Investing Activities
Acquisitions of real estate property	0	(64,491)	(152,791)
Additions to land, buildings and improvements	(259,663)	(300,770)	(302,486)
Investments in unconsolidated joint ventures	(184,481)	(184,518)	(88,872)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	140,569	141,742	770,604
Net proceeds from disposition of real estate/joint venture interest	557,611	626,364	651,594
Cash and restricted cash assumed from acquisition of real estate investment	0	60,494	0
Cash assumed from consolidation of real estate investment	0	0	9,475
Proceeds from sale or redemption of marketable securities	0	15,626	4,528
Purchases of marketable securities	0	0	(10,000)
Other investments	(17,334)	1,432	40,200
Origination of debt and preferred equity investments	(65,357)	(51,367)	(95,695)
Repayments or redemption of debt and preferred equity investments	0	181,293	167,024
Net cash provided by investing activities	171,345	425,805	993,581
Financing Activities
Proceeds from mortgages and other loans payable	0	381,980	39,689
Repayments of mortgages and other loans payable	(25,826)	(292,364)	(375,044)
Proceeds from revolving credit facility, term loans and senior unsecured notes	538,000	1,524,000	1,488,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(828,000)	(1,864,000)	(1,808,000)
Proceeds from stock options exercised and DRSPP issuance	525	525	1,556
Repurchase of common units	0	(151,197)	(341,403)
Redemption of preferred units	(11,700)	(17,967)	(6,040)
Redemption of OP units	(9,076)	(40,901)	(25,703)
Distributions to noncontrolling interests in other partnerships	(2,777)	(4,699)	(6,631)
Contributions from noncontrolling interests in other partnerships	6,932	52,164	336
Acquisition of subsidiary interest from noncontrolling interest	0	(29,817)	0
Distributions paid on common and preferred units	(245,710)	(278,408)	(286,824)
Other obligation related to secured borrowing	129,656	77,874	51,862
Tax withholdings related to restricted share awards	0	(3,915)	(2,990)
Deferred loan costs	(1,407)	(8,098)	(13,745)
Principal payments on financing lease liabilities	0	0	(434)
Net cash used in financing activities	(449,383)	(654,823)	(1,285,371)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(48,535)	47,070	(35,811)
Cash, cash equivalents, and restricted cash at beginning of year	384,054	336,984	372,795
Cash, cash equivalents, and restricted cash at end of period	335,519	384,054	336,984
Supplemental cash flow disclosures:
Interest paid	229,119	169,519	152,773
Income taxes paid	7,815	5,358	4,405
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Redemption of units in the Operating Partnership for a joint venture sale	0	0	27,586
Exchange of preferred equity investment for real estate or equity in joint venture	0	190,652	0
Exchange of debt investment for real estate or equity in joint venture	349,946	193,995	9,468
Assumption of mortgage and mezzanine loans	0	1,712,750	60,000
Issuance of special distribution paid in units	0	160,620	121,418
Tenant improvements and capital expenditures payable	0	18,518	7,580
Fair value adjustment to noncontrolling interest in the Operating Partnership	15,486	39,974	9,851
Investment in joint venture	0	47,135	0
Deconsolidation of a subsidiary	101,351	0	66,837
Deconsolidation of subsidiary debt	1,712,750	0	510,000
Debt and preferred equity investments	0	302	8,372
Transfer of assets related to assets held for sale	0	0	140,855
Transfer of liabilities related to assets held for sale	0	0	64,120
Extinguishment of debt in connection with property dispositions	0	0	53,548
Consolidation of real estate investment	0	0	119,444
Removal of fully depreciated commercial real estate properties	16,313	30,359	19,831
Sale of interest in partially owned entity	0	0	4,476
Contribution to consolidated joint venture by noncontrolling interest	8,134	0	0
Distributions to noncontrolling interests	0	0	358
Share repurchase or redemption payable	9,513	0	0
Recognition of right of use assets and related lease liabilities	0	57,938	537,344
Cash and cash equivalents	221,823	203,273	251,417
Restricted cash	113,696	180,781	85,567
Total cash, cash equivalents, and restricted cash	$ 335,519	$ 384,054	$ 336,984

XML

Consolidated Statements of Cash Flows (Partnership) (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash distribution declared, per common share (in dollars per share)	$ 3.2288	$ 3.6896	$ 6.2729
Ordinary Dividend
Cash distribution declared, per common share (in dollars per share)	$ 0.2500	$ 0.2708	0.3108
Special Dividend
Cash distribution declared, per common share (in dollars per share)			$ 2.4392

XML

Organization and Basis of Presentation

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

Organization and Basis of Presentation

SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as S.L. Green Management Corp, or the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC and S.L. Green Management Corp., respectively, which are 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of December 31, 2023, noncontrolling investors held, in the aggregate, a 5.75% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements."

On December 31, 2023, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Buildings		Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings		Approximate Square Feet (unaudited)		Weighted Average Leased Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	13	(2)	8,399,141	12	15,412,174	25	(2)	23,811,315	(2)	89.4	%
	Retail	3	(2)	40,536	7	281,796	10	(2)	322,332	(2)	91.2	%
	Development/Redevelopment	3	(3)	1,443,771	3	2,893,357	6	(2)	4,337,128	(2)	N/A
		19		9,883,448	22	18,587,327	41		28,470,775		89.5	%
Suburban	Office	7		862,800	—	—	7		862,800		77.1	%
Total commercial properties		26		10,746,248	22	18,587,327	48		29,333,575		89.0	%
Residential:
Manhattan	Residential	1	(3)	140,382	1	221,884	2		362,266		99.0	%
Total portfolio		27		10,886,630	23	18,809,211	50		29,695,841		89.2	%

(1)The weighted average leased occupancy for commercial properties represents the total leased square footage divided by the total square footage at acquisition.  The weighted average leased for residential properties represents the total leased units divided by the total available units. Properties under construction are not included in the calculation of weighted average leased occupancy.

(2)Includes assets within the Company's alternative strategy portfolio. Within that portfolio, office includes one building totaling 2,048,725 square feet, retail includes eight buildings totaling 286,738 square feet, and development/redevelopment includes two buildings totaling 1,496,931 square feet.

(3)As of December 31, 2023, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

As of December 31, 2023, we also managed one office building and one retail building owned by a third party encompassing approximately 0.4 million square feet (unaudited), and held debt and preferred equity investments with a book value of $346.7 million, excluding debt and preferred equity investments and other financing receivables totaling $7.9 million that are included in balance sheet line items other than the Debt and preferred equity investments line item.

Partnership Agreement

In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners, subject to the priority distributions with respect to preferred units and special provisions that apply to Long Term Incentive Plan ("LTIP") Units. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis.

Subsequent Events

In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest at 2 Herald for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024. See Note 6, "Investments in Unconsolidated Joint Ventures."

In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for a total consideration of $963.0 million. See Note 6, "Investments in Unconsolidated Joint Ventures."

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Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Significant Accounting Policies

Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a VIE in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income (loss) attributed to controlling and noncontrolling interests.

We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights provided to each party and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.

Investment in Commercial Real Estate Properties

Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.

We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their respective fair values on the acquisition date. When we acquire our partner's equity interest in an existing unconsolidated joint venture and gain control over the investment, we record the consolidated investment at fair value. The difference between the book value of our equity investment on the purchase date and our share of the fair value of the investment's purchase price is recorded as a purchase price fair value adjustment in our consolidated statements of operations. See Note 3, "Property Acquisitions."

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from 3 years to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from 1 year to 15 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from 1 year to 15 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2023, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 4.7 years, 8.1 years, and 3.1 years, respectively.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction.

Properties other than Right of use assets - operating leases are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category	Term
Building (fee ownership)	40 years
Building improvements	shorter of remaining life of the building or useful life
Building (leasehold interest)	lesser of 40 years or remaining term of the lease
Right of use assets - financing leases	lesser of 40 years or remaining lease term
Furniture and fixtures	4 to 7 years
Tenant improvements	shorter of remaining term of the lease or useful life

Right of use assets - operating leases are amortized over the remaining lease term. The amortization is made up of the principal amortization under the lease liability plus or minus the straight-line adjustment of the operating lease rent under ASC 842.

Depreciation expense (including amortization of right of use assets - financing leases) totaled $221.0 million, $190.1 million, and $187.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

On a periodic basis, we assess whether there are any indications that the value of our real estate consolidated properties may be impaired or that their carrying value may not be recoverable. A consolidated property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also evaluate our real estate consolidated properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

In April 2023, the ground rent appraisal proceeding concluded for our wholly-owned leasehold interest at 625 Madison Avenue. As a result of that proceeding, the ground rent was reset from the previous rent of $4.61 million per annum to a new rent of $20.25 million per annum, effective as of July 1, 2022. Following a strategic review of the property that addressed a range of relevant considerations, including the increase in ground rent to an amount substantially above what the Company believed was appropriate, the Company recorded a $249.5 million charge to write down the carrying value of its investment in the leasehold interest to zero for the year ended December 31, 2023, which is included in Depreciable real estate reserves and impairments in the consolidated statement of operations.

For the years ended December 31, 2023 and 2022, we recognized $14.2 million and $5.7 million, respectively, of rental revenue for the amortization of aggregate below-market leases in excess of above-market leases resulting from the allocation of the purchase price of the applicable properties. For the year ended December 31, 2021, we recognized a reduction of rental revenue of ($4.2 million) for the amortization of aggregate above-market leases in excess of below-market leases.

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,902)		(190,066)
Net	$	4,778	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,089)		(212,191)
Net	$	3,305	$	149,147

The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands):    

2024	$	36
2025	234
2026	205
2027	184
2028	70

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands):

2024	$	1,096
2025	728
2026	551
2027	312
2028	158

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of December 31, 2023, we did not have any debt securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.

As of December 31, 2023 and 2022, we held the following marketable securities (in thousands):

	December 31, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,591	$	11,240
Total investment in marketable securities	$	9,591	$	11,240

The cost basis of the commercial mortgage-backed securities was $11.5 million as of December 31, 2023 and 2022. These securities mature at various times through 2030. All securities were in an unrealized loss position as of December 31, 2023 and 2022 with an unrealized loss of $1.9 million and fair market value of $9.6 million as of December 31, 2023, and an unrealized loss of $0.3 million and a fair market value of $11.2 million as of December 31, 2022. The securities were in a continuous unrealized loss position for more than 12 months as of December 31, 2023 and less than 12 months as of December 31, 2022. We do not intend to sell our other securities, and it is more likely than not that we will not be required to sell the investment before the recovery of their amortized cost basis.

During the year ended December 31, 2023, we did not dispose of any debt marketable securities. During the year ended December 31, 2022, we received aggregate net proceeds of $7.8 million from the sale of one debt marketable security and $3.7 million from the repayment of one debt marketable security. During the year ended December 31, 2021, we received aggregate net proceeds of $4.5 million from the repayment of one debt marketable security.

We held no equity marketable securities as of December 31, 2023 and 2022 as we sold the one equity marketable security that was held as of December 31, 2021 during the year ended December 31, 2022, for which we received aggregate net proceeds of $4.2 million. We did not dispose of any equity marketable securities during the year ended December 31, 2021. We recognized $6.5 million of realized losses and $0.6 million of unrealized gains for the years ended December 31, 2022 and 2021, respectively.

Investments in Unconsolidated Joint Ventures

We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. Unless we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans.

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired at December 31, 2023.

We may originate loans for real estate acquisition, development and construction ("ADC loans"), where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments.

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term. Certain of our employees provide leasing services to the wholly-owned properties. For the years ended December 31, 2023, 2022 and 2021, $6.8 million, $6.6 million, and $6.2 million of their compensation, respectively, was capitalized and is amortized over an estimated average lease term of seven years.

Deferred Financing Costs

Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close. Deferred financing costs related to a recognized debt liability are presented in the consolidated balance sheet as a direct deduction from the carrying amount of that debt liability.

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Revenues from the sale of SUMMIT tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $2.6 million and $2.0 million, respectively, and is included in Deferred revenue on the consolidated balance sheets.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

Rent Expense

Rent expense is recognized on a straight-line basis over the initial term of the lease. The excess of the rent expense recognized over the amounts contractually due pursuant to the underlying lease is included in the lease liability - operating leases on the consolidated balance sheets.

Underwriting Commissions and Costs

Underwriting commissions and costs incurred in connection with our stock offerings are reflected as a reduction of additional paid-in-capital.

Transaction Costs

Transaction costs for real estate asset acquisitions are capitalized to the investment basis, which is then subject to a purchase price allocation based on relative fair value. Transaction costs for business combinations or costs incurred on potential transactions that are not consummated are expensed as incurred.

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on its taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on its undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

We have elected, and may elect in the future, to treat certain of our corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal, state and local corporate tax liability for these entities. SUMMIT is held in a TRS and pays Federal, state and local taxes. During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax expense for SUMMIT of $9.2 million, $2.6 million, and $1.0 million, respectively.

During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax provisions of $8.2 million, $3.7 million, and $2.8 million, respectively. For the year ended December 31, 2023, the Company paid distributions on its common stock of $3.25 per share which represented $0.00 per share of ordinary income and $3.25 per share of capital gains. For the year ended December 31, 2022, the Company paid distributions on its common stock of $6.17 per share which represented $2.56 per share of ordinary income, and $1.17 per share of capital gains. For the year ended December 31, 2021, the Company paid distributions on its common stock of $8.09 per share which represented $0.50 per share of ordinary income and $5.92 per share of capital gains.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Stock Based Employee Compensation Plans

We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation."

For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of our Board of Directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable award date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.

The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options.

Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on either the grant date or the date immediately preceding the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date.

Derivative Instruments

In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify for hedge accounting. Some derivative instruments are associated with an anticipated transaction. In those cases, hedge effectiveness criteria also require that it be probable that the underlying transaction occurs. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract.

To determine the fair values of derivative instruments, we use a variety of methods and assumptions that are based on market conditions and risks existing at each balance sheet date. For the majority of financial instruments including most derivatives, long-term investments and long-term debt, standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost, and termination cost are used to determine fair value. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized.

In the normal course of business, we are exposed to the effect of interest rate changes and limit these risks by following established risk management policies and procedures including the use of derivatives. To address exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices and manage the cost of borrowing obligations.

We use a variety of conventional derivative products. These derivatives include, but are not limited to, interest rate swaps, caps, collars and floors. We expressly prohibit the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors.

We may employ swaps, forwards or purchased options to hedge qualifying forecasted transactions. Gains and losses related to these transactions are deferred and recognized in net income as interest expense in the same period or periods that the underlying transaction occurs, expires or is otherwise terminated.

Hedges that are reported at fair value and presented on the balance sheet could be characterized as cash flow hedges or fair value hedges. Interest rate caps and collars are examples of cash flow hedges. Cash flow hedges address the risk associated with future cash flows of interest payments. For all hedges held by us that meet the hedging objectives established by our corporate policy governing interest rate risk management, no net gains or losses were reported in earnings. The changes in fair value of derivative instruments designated as hedge instruments are reflected in accumulated other comprehensive income. For derivative instruments not designated as hedging instruments, the gain or loss, resulting from the change in the estimated fair value of the derivative instruments, is recognized in current earnings during the period of change.

Earnings per Share of the Company

The Company presents both basic and diluted earnings per share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method.

Earnings per Unit of the Operating Partnership

The Operating Partnership presents both basic and diluted earnings per unit ("EPU") using the two-class method, which is an earnings allocation formula that determines EPU for common units and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPU is computed by dividing the income available to common unitholders by the weighted-average number of common units outstanding for the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries. Other than one tenant, Paramount Global (formerly ViacomCBS Inc.), which accounted for 5.9% of our share of annualized cash rent as of December 31, 2023, no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized cash rent, as of December 31, 2023.

For the years ended December 31, 2023, 2022, and 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	2023	Property	2022	Property	2021
One Vanderbilt Avenue	16.0%	One Vanderbilt Avenue	14.1%	11 Madison Avenue	10.8%
11 Madison Avenue	8.3%	245 Park Avenue	10.0%	420 Lexington Avenue	8.3%
420 Lexington Avenue	6.7%	11 Madison Avenue	7.8%	1515 Broadway	8.1%
1515 Broadway	6.4%	420 Lexington Avenue	6.3%	1185 Avenue of the Americas	8.0%
1185 Avenue of the Americas	5.6%	1515 Broadway	5.8%	280 Park Avenue	6.7%
280 Park Avenue	5.5%	1185 Avenue of the Americas	5.1%	919 Third Avenue	5.3%
245 Park Avenue	5.5%	280 Park Avenue	5.1%	485 Lexington Avenue	5.3%
				555 West 57th Street	5.2%

As of December 31, 2023, 57.6% of our work force is covered by five collective bargaining agreements, and 1.3% of our work force is covered by collective bargaining agreements that expire before December 31, 2024. See Note 19, "Benefits Plans."

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

As of December 31, 2023, the SUMMIT meets the criteria of a reportable operating segment pursuant to the guidance in ASC 280. Accordingly, we reclassified SUMMIT Operator revenue, SUMMIT Operator expenses, and SUMMIT Operator tax expense to separate financial statement line items in our consolidated statements of operations. These items were previously presented on a net basis in Other income. Additionally, the depreciation and amortization of SUMMIT assets are included in Depreciation and amortization in our consolidated statements of operations. Prior period balances have been reclassified to conform to the current period presentation.

Accounting Standards Updates

In December 2023, the FASB issued ASU No. 2023-09 Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The objective of the amendments in ASU 2023-09 related to the rate reconciliation and income taxes paid disclosures are to improve transparency of income tax disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, and income taxes paid disaggregated by jurisdiction. The amendment will require that public entities on an annual basis disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. Additionally, the amendment will require that all entities disclose on an annual basis the amount of taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes as well as disaggregated by individual jurisdictions that meet a quantitative threshold. ASU 2023-09 is effective prospectively for annual periods beginning after December 15, 2024. Early adoption and retrospective application is permitted. We are currently evaluating the impact of the adoption of ASU 2023-09 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In November 2023, the FASB issued ASU No. 2023-07 Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. ASU 2023-07 amends the reportable segment disclosure requirements to enhance disclosures about significant segment expenses. The objective of the amendment is to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. The amendment will require that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss (collectively referred to as the "significant expense principle"). Additionally, the amendment will require an entity to disclose an amount for "other segment items" by reportable segment and a description of its composition as well as require annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 in interim periods. Lastly, the amendment will require a public entity to disclose the title and position of the CODM and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding to allocate resources. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted and should be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating the impact of the adoption of ASU 2023-07 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. We are currently evaluating the impact of the adoption of ASU 2023-05 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements.

In July 2021, the FASB issued ASU No. 2021-05 Leases (Topic 842) Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 amends the lease classification requirements for lessors when classifying and accounting for a lease with variable lease payments that do not depend on a reference rate index or a rate. The update provides criteria, that if met, the lease would be classified and accounted for as an operating lease. ASU 2021-05 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2024, which was extended from the original sunset date of December 31, 2022 when the FASB issued ASU No. 2022-06 in December 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the 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. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The impact of this guidance did not have a material impact on the Company's consolidated financial statements.

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Property Acquisitions

12 Months Ended

Dec. 31, 2023

Business Combination and Asset Acquisition [Abstract]

Property Acquisitions

Property Acquisitions

2023 Acquisitions

During the year ended December 31, 2023, we did not acquire any properties from a third party.

2022 Acquisitions

The following table summarizes the properties acquired during the year ended December 31, 2022:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
245 Park Avenue (1)	September 2022	Fee Interest	1,782,793	$	1,960.0

(1)On October 31, 2021, HNA, through an affiliated entity, filed for Chapter 11 bankruptcy protection on account of its investment in 245 Park Avenue, together with another asset in Chicago. On July 8, 2022, certain of the debtors and affiliates of SL Green entered into a Plan Sponsorship and Investment Agreement (the "Plan"). Since the debtors did not receive any qualifying bids for the property and the Plan was confirmed, SL Green acquired full ownership and control of the property in September 2022, at which time our outstanding preferred equity and accrued interest balance were credited to our equity investment in the property. We recorded the assets acquired and liabilities assumed at fair value. See Note 16, "Fair Value Measurements."

2021 Acquisitions

The following table summarizes the properties acquired during the year ended December 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9
461 Fifth Avenue (2)	June 2021	Fee Interest	200,000	28.0
1591-1597 Broadway	September 2021	Fee Interest	7,684	121.0
690 Madison Avenue (3)	September 2021	Fee Interest	7,848	72.2

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures."

(2)In April 2021, the Company exercised its option to acquire the fee interest in the property from the ground lessor and the Company acquired the fee interest in June 2021. The Company held the leasehold interest in the property prior to exercising its option.

(3)In September 2021, the Company was the successful bidder for the fee interest in 690 Madison Avenue at the foreclosure of the asset. The property previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value.

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Properties Held for Sale and Property Dispositions

12 Months Ended

Dec. 31, 2023

Discontinued Operations and Disposal Groups [Abstract]

Properties Held for Sale and Property Dispositions

Properties Held for Sale and Property Dispositions

Properties Held for Sale

As of December 31, 2023 and 2022, no properties were classified as held for sale.

Property Dispositions

The following table summarizes the properties sold during the years ended December 31, 2023, 2022, and 2021:

Property	Disposition Date	Property Type	Unaudited Approximate Usable Square Feet	Sales Price (1) (in millions)		(Loss) Gain on Sale (2) (in millions)
245 Park Avenue (3)	June 2023	Fee Interest	1,782,793	$	1,995.0	$	(28.3)
885 Third Avenue - Office Condominium Units (4)	December 2022	Fee / Leasehold Interest	414,317	300.4		(24.0)
609 Fifth Avenue	June 2022	Fee Interest	138,563	100.5		(80.2)
1591-1597 Broadway	May 2022	Fee Interest	7,684	121.0		(4.5)
1080 Amsterdam Avenue	April 2022	Leasehold Interest	85,250	42.7		17.9
707 Eleventh Avenue	February 2022	Fee Interest	159,720	95.0		(0.8)
110 East 42nd Street	December 2021	Fee Interest	215,400	117.1		3.6
590 Fifth Avenue	October 2021	Fee Interest	103,300	103.0		(3.2)
220 East 42nd Street (5)	July 2021	Fee Interest	1,135,000	783.5		175.1
635-641 Sixth Avenue	June 2021	Fee Interest	267,000	325.0		99.4
106 Spring Street (6)	March 2021	Fee Interest	5,928	35.0		(2.8)
133 Greene Street (6)	February 2021	Fee Interest	6,425	15.8		0.2
712 Madison Avenue (7)	January 2021	Fee Interest	6,600	43.0		(1.4)

(1)Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2)The (losses) gains on sale are net of $11.3 million, $11.2 million, and $13.7 million of employee compensation accrued in connection with the realization of the investment dispositions during the years ended December 31, 2023, 2022, and 2021, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) that is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture" and Note 16, " Fair Value Measurements."

(4)In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

(5)In July 2021, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million, which is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Ventures."

(6)In March 2021, the property was foreclosed by the lender.

(7)Disposition resulted from the ground lessee exercising its purchase option under a ground lease arrangement.

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Debt and Preferred Equity Investments

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023			December 31, 2022
Balance at beginning of year (1)	$	623,280		$	1,088,723
Debt investment originations/fundings/accretion (2)	72,160			62,992
Preferred equity investment originations/accretion (2)	8,142			37,505
Redemptions/sales/syndications/equity ownership/amortization	(349,947)			(565,940)
Net change in loan loss reserves	(6,890)			—
Balance at end of period (1)	$	346,745	(3)	$	623,280

(1)Net of unamortized fees, discounts, and premiums.

(2)Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

Below is a summary of our debt and preferred equity investments as of December 31, 2023 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value			Senior Financing		Maturity(1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Mezzanine Debt	$	168,745	$	168,912	S + 4.95 - 12.38%	$	50,000	$	50,000	8.00 - 8.40%	$	218,745	(2)	$	1,071,858	2024 - 2029
Preferred Equity	—		—		—	128,000		128,000		6.5%	128,000			250,000		2027
Balance at end of period	$	168,745	$	168,912		$	178,000	$	178,000		$	346,745		$	1,321,858

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

(2)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

The following table is a roll forward of our total allowance for loan losses for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
	2023			2022		2021
Balance at beginning of year	$	6,630		$	6,630	$	13,213
Current period provision for loan loss	6,890			—		—
Write-offs charged against the allowance	—			—		(6,583)
Balance at end of period	$	13,520	(1)	$	6,630	$	6,630

(1)As of December 31, 2023, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $49.8 million, which is included in the Company's alternative strategy portfolio.

As of December 31, 2023, two investments with a total carrying value, net of reserves, of $49.8 million were not performing in accordance with their respective terms. As of December 31, 2022, one investment with a carrying value, net of reserves, of $6.9 million was not performing in accordance with its respective terms. This is further discussed in the Debt Investments and Preferred Equity Investments tables below.

No other financing receivables were 90 days past due as of December 31, 2023 and December 31, 2022.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2023 and 2022 (dollars in thousands):

Risk Rating	December 31, 2023			December 31, 2022
1 - Low Risk Assets - Low probability of loss	$	210,333		$	264,069
2 - Watch List Assets - Higher potential for loss	136,412		(1)	352,321
3 - High Risk Assets - Loss more likely than not	—			6,890
	$	346,745		$	623,280

(1)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of December 31, 2023 (dollars in thousands):

	As of December 31,
Risk Rating	2023(1)		2022(1)		2021(1)		Prior(1)(2)			Total
1 - Low Risk Assets - Low probability of loss	$	—	$	—	$	—	$	210,333		$	210,333
2 - Watch List Assets - Higher potential for loss	—		—		—		136,412		(3)	136,412
3 - High Risk Assets - Loss more likely than not	—		—		—		—			—
	$	—	$	—	$	—	$	346,745		$	346,745

(1)Year in which the investment was originated or acquired by us or in which a material modification occurred.

(2)During the year ended December 31, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

We have determined that we have one portfolio segment of financing receivables as of December 31, 2023 and 2022 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments.

Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $8.8 million and $9.0 million as of December 31, 2023 and 2022, respectively. The Company recorded no provisions for loan losses related to these financing receivables for the years ended December 31, 2023 and 2022, respectively. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms. One loan with a carrying value of $5.6 million was put on non-accrual in July 2020 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual.

Debt Investments

As of December 31, 2023 and 2022, we held the following debt investments with an aggregate weighted average current yield of 8.68% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Loan Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mezzanine Loan (3) (4) (6)	$	—	$	105,000	$	13,366	$	13,366	June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Mezzanine Loan	—		—		—		225,367
Mezzanine Loan	—		—		—		77,109
Total fixed rate	$	—	$	285,000	$	63,366	$	365,842
Floating Rate Investments:
Mezzanine Loan (5) (6)	$	—	$	275,000	$	50,000	$	50,000	April 2023
Mezzanine Loan	3,761		54,000		8,243		8,243		May 2024
Mezzanine Loan	2,655		271,774		62,333		46,884		May 2024
Mezzanine Loan	10,760		186,084		48,323		39,083		January 2026
Total floating rate	$	17,176	$	786,858	$	168,899	$	144,210
Allowance for loan loss	$	—	$	—	$	(13,520)	$	(6,630)
Total	$	17,176	$	1,071,858	$	218,745	$	503,422

(1)Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2)Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing.

(3)Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting, which is included in Other assets and Other liabilities on the consolidated balance sheets.

(4)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE, in which we are not the primary beneficiary.

(5)This loan went into default and was put on non-accrual in January 2023 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower with respect to the loan.

(6)Included in the Company's alternative strategy portfolio.

Preferred Equity Investments

As of December 31, 2023 and 2022, we held the following preferred equity investments with an aggregate weighted average current yield of 6.55% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	250,000	$	128,000	$	119,858	February 2027
Total	$	—	$	250,000	$	128,000	$	119,858

(1)Carrying value is net of deferred origination fees.

(2)Represents contractual redemption, excluding any unexercised extension options.

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Investments in Unconsolidated Joint Ventures

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of December 31, 2023, the book value of these investments was $3.0 billion, net of investments with negative book values totaling $149.1 million for which we have an implicit commitment to fund future capital needs.

As of December 31, 2023, 800 Third Avenue and 625 Madison Avenue are VIEs in which we are not the primary beneficiary. As of December 31, 2022, 800 Third Avenue and 21 East 66th Street are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $437.9 million as of December 31, 2023 and $86.2 million as of December 31, 2022. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies". All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting.

The table below provides general information on each of our joint ventures as of December 31, 2023:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue (2) (3)	Wharton Properties / Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street (2)	Private Investor / Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2) (4)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
650 Fifth Avenue (2) (5)	Wharton Properties	50.00%	50.00%	69,214
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
One Vanderbilt Avenue	National Pension Service of Korea / Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza (2)	RXR Realty / New York REIT	24.95%	24.95%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square (2) (6)	Israeli Institutional Investor	51.00%	51.00%	369,000
115 Spring Street (2)	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.27%	36.27%	12,946
One Madison Avenue (8)	National Pension Service of Korea / Hines Interest LP / International Investor	25.50%	25.50%	1,048,700
220 East 42nd Street	A fund managed by Meritz Alternative Investment Management	51.00%	51.00%	1,135,000
450 Park Avenue (9)	Korean Institutional Investor / Israeli Institutional Investor	50.10%	25.10%	337,000
5 Times Square (2)	RXR Realty led investment group	31.55%	31.55%	1,131,735
245 Park Avenue (10)	U.S. Affiliate of Mori Trust Co., Ltd	50.10%	50.10%	1,782,793
625 Madison Avenue (11)	Private Investor	90.43%	90.43%	563,000

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)Included in the Company's alternative strategy portfolio.

(3)In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for total consideration of $963.0 million.

(4)The joint venture owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. In December 2023, following an assessment of the investment for recoverability, the Company recorded a charge of $8.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(5)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(6)In December 2023, following an assessment of the property and the investment for recoverability, the Company recorded a charge of $101.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at December 31, 2023 and 2022.

(9)The 50.1% ownership interest reflected in this table is comprised of our 25.1% economic interest and a 25.0% economic interest held by a third-party. The third-party's economic interest is held within a joint venture that we consolidate and recognize in Noncontrolling interests in other partnerships on our consolidated balance sheet. An additional third-party owns the remaining 49.9% economic interest in the property.

(10)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

(11)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments." In December 2023, together with its joint venture, the Company entered into a contract to sell the fee ownership in the property. In connection with this contract, the Company recorded a charge of $23.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. This transaction is expected to close in the first quarter of 2024.

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2023, 2022, and 2021:

Property	Ownership Interest Sold	Disposition Date	Gross Asset Valuation (in millions)		(Loss) Gain on Sale (in millions) (1) (2)
21 East 66th Street	32.28%	December 2023	$	40.6	$	(12.7)
121 Greene Street	50.00%	February 2023	14.0		(0.3)
Stonehenge Portfolio	Various	April 2022	1.0		—
400 East 57th Street (3)	41.00%	September 2021	133.5		(1.0)
605 West 42nd Street - Sky	20.00%	June 2021	858.1		8.9
55 West 46th Street - Tower 46	25.00%	March 2021	275.0		(15.2)
885 Third Avenue (4)	N/A	January 2021	N/A		N/A

(1)Represents the Company's share of the gain or loss

(2)For the years ended December 31, 2023 and December 31, 2021, the (losses) gains on sale are net of $2.0 million and $1.4 million, respectively, of employee compensation accrued in connection with the realization of the investment dispositions. There was no amount accrued for employee compensation in the year ended December 31, 2022. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In connection with our agreement to sell the property in April 2021, we recorded a charge of $5.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(4)In January 2021, pursuant to the partnership documents, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of December 31, 2023 and 2022, respectively, are as follows (dollars in thousands):

							Principal Outstanding				Principal Outstanding
	Economic		Current Maturity	Final Maturity	Interest		December 31, 2023				December 31, 2022
Property	Interest (1)		Date	Date (2)	Rate (3)		Gross		SLG Share		Gross		SLG Share
Fixed Rate Debt:
717 Fifth Avenue (4)(5)	10.92	%	July 2022 (5)	July 2022 (5)		5.02%	$	655,328	$	71,536	$	655,328	$	71,536
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)		5.45%	65,000		32,500		65,000		32,500
220 East 42nd Street	51.00	%	June 2024	June 2025		5.86%	505,412		257,760		510,000		260,100
5 Times Square (4)	31.55	%	September 2024	September 2026		7.13%	477,783		150,740		400,000		126,200
10 East 53rd Street	55.00	%	February 2025	February 2025		5.45%	220,000		121,000		220,000		121,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93%	762,002		433,344		782,321		444,898
115 Spring Street (4)	51.00	%	March 2025	March 2025		5.50%	65,550		33,431		—		—
450 Park Avenue	25.10	%	June 2025	June 2027		6.10%	271,394		68,120		267,000		67,017
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84%	1,400,000		840,000		1,400,000		840,000
One Madison Avenue (7)	25.50	%	November 2025	November 2026		3.59%	733,103		186,941		467,008		119,087
800 Third Avenue	60.52	%	February 2026	February 2026		3.37%	177,000		107,120		177,000		107,120
919 Third Avenue	51.00	%	April 2026	April 2028		6.11%	500,000		255,000		500,000		255,000
625 Madison Avenue (8)	90.43	%	December 2026	December 2026		5.11%	199,987		180,848		—		—
245 Park Avenue	50.10	%	June 2027	June 2027		4.30%	1,768,000		885,768		—		—
Worldwide Plaza (4)	24.95	%	November 2027	November 2027		3.98%	1,200,000		299,400		1,200,000		299,400
One Vanderbilt Avenue	71.01	%	July 2031	July 2031		2.95%	3,000,000		2,130,300		3,000,000		2,130,300
280 Park Avenue							—		—		1,200,000		600,000
21 East 66th Street							—		—		12,000		3,874
Total fixed rate debt							$	12,000,559	$	6,053,808	$	10,855,657	$	5,478,032
Floating Rate Debt:
11 West 34th Street (4)	30.00	%	February 2023 (9)	February 2023 (9)	L+	1.45%	$	23,000	$	6,900	$	23,000	$	6,900
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)	S+	2.25%	210,000		105,000		210,000		105,000
2 Herald Square (4)(10)	51.00	%	November 2023(10)	November 2023(10)	S+	2.06%	182,500		93,075		182,500		93,075
100 Park Avenue	49.90	%	January 2024 (11)	December 2025	S+	2.36%	360,000		179,640		360,000		179,640
15 Beekman (12)	20.00	%	January 2024 (13)	July 2025	S+	1.61%	124,137		24,827		86,738		17,348
1552 Broadway (4)	50.00	%	February 2024	February 2024	S+	2.75%	193,133		96,567		193,132		96,566
5 Times Square (4)	31.55	%	September 2024	September 2026	S+	5.65%	610,010		192,458		495,924		156,464
280 Park Avenue	50.00	%	September 2024	September 2024	S+	2.03%	1,200,000		600,000		—		—
21 East 66th Street							—		—		586		188
115 Spring Street							—		—		65,550		33,431
121 Greene Street							—		—		12,550		6,275
Total floating rate debt							$	2,902,780	$	1,298,467	$	1,629,980	$	694,887
Total joint venture mortgages and other loans payable							$	14,903,339	$	7,352,275	$	12,485,637	$	6,172,919
Deferred financing costs, net							(104,062)		(54,865)		(136,683)		(66,910)
Total joint venture mortgages and other loans payable, net							$	14,799,277	$	7,297,410	$	12,348,954	$	6,106,009

(1)Economic interest represents the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property.

(3)Interest rates as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S").

(4)Included in the Company's alternative strategy portfolio.

(5)The asset was sold and associated debt repaid in January 2024.

(6)In January 2024, the maturity date of the loan was extended by two months to March 2024.

(7)The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. In July 2023, the facility was modified, which will allow the partnership to utilize the final tranche of the facility for an expanded range of uses, including additional amenities funded by construction cost savings and for hedging activities in contemplation of a permanent financing.

(8)Represents $168.9 million of loan principal and $31.1 million of accrued interest.

(9)The Company's joint venture partner is in discussions with the lender on resolution of the past maturity.

(10)The Company closed on the acquisition of additional interests in the joint venture in January 2024, which increased the Company's interest to 95%. In addition, the joint venture entered into an agreement to satisfy the existing mortgage for a net payment of $7.0 million, which closed in February 2024.

(11)The Company is in discussions with the lender to exercise the available extension option.

(12)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(13)In January 2024, the maturity date of the loan was extended to July 2024.

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $21.1 million, $24.0 million and $19.6 million from these services, net of our ownership share of the joint ventures, for the years ended December 31, 2023, 2022, and 2021, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.

The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2023 and 2022, are as follows (in thousands):

	December 31, 2023		December 31, 2022
Assets (1)
Commercial real estate property, net	$	18,467,340	$	15,989,642
Cash and restricted cash	656,038		709,299
Tenant and other receivables, related party receivables, and deferred rents receivable	673,532		601,552
Other assets	2,584,765		2,551,426
Total assets	$	22,381,675	$	19,851,919
Liabilities and equity (1)
Mortgages and other loans payable, net	$	14,799,277	$	12,348,954
Deferred revenue	1,108,180		1,077,901
Lease liabilities	990,276		1,000,356
Other liabilities	447,705		456,537
Equity	5,036,237		4,968,171
Total liabilities and equity	$	22,381,675	$	19,851,919
Company's investments in unconsolidated joint ventures	$	2,983,313	$	3,190,137

(1)As of December 31, 2023, $545.6 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the years ended December 31, 2023, 2022, and 2021 are as follows (unaudited, in thousands):

	Year Ended December 31,
	2023		2022		2021
Total revenues	$	1,525,044	$	1,339,364	$	1,228,364
Operating expenses	253,630		240,002		203,332
Real estate taxes	287,462		252,806		225,104
Operating lease rent	29,048		26,152		22,576
Interest expense, net of interest income	574,032		431,865		342,910
Amortization of deferred financing costs	28,157		27,754		31,423
Depreciation and amortization	516,466		465,100		484,130
Total expenses	$	1,688,795	$	1,443,679	$	1,309,475
Loss on early extinguishment of debt	—		(467)		(2,017)
Net loss before (loss) gain on sale	$	(163,751)	$	(104,782)	$	(83,128)
Company's equity in net loss from unconsolidated joint ventures	$	(76,509)	$	(57,958)	$	(55,402)

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Deferred Costs

12 Months Ended

Dec. 31, 2023

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred Costs

Deferred Costs

Deferred costs as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Deferred leasing costs	$	399,224	$	407,188
Less: accumulated amortization	(287,761)		(286,031)
Deferred costs, net	$	111,463	$	121,157

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Mortgages and Other Loans Payable

12 Months Ended

Dec. 31, 2023

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2023 and 2022, respectively, were as follows (dollars in thousands):

Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		December 31, 2023		December 31, 2022
Fixed Rate Debt:
420 Lexington Avenue	October 2024	October 2040		3.99%	$	277,238	$	283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
7 Dey / 185 Broadway	November 2025	November 2026		6.65%	190,148		200,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
719 Seventh Avenue					—		50,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,387,386	$	3,165,814
Floating Rate Debt:
690 Madison Avenue (3)	July 2024	July 2025	S+	0.50%	$	60,000	$	60,000
719 Seventh Avenue (3)	December 2024	December 2024	S+	1.31%	50,000		—
7 Dey / 185 Broadway					—		10,148
Total floating rate debt					$	110,000	$	70,148
Total mortgages and other loans payable					$	1,497,386	$	3,235,962
Deferred financing costs, net of amortization					(6,067)		(8,399)
Total mortgages and other loans payable, net					$	1,491,319	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

(3)Included in the Company's alternative strategy portfolio.

As of December 31, 2023 and 2022, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $1.9 billion and $3.8 billion, respectively.

Corporate Indebtedness

2021 Credit Facility

In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2023, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of December 31, 2023, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

As of December 31, 2023, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 165 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2023, the facility fee was 30 basis points.

As of December 31, 2023, we had $2.0 million of outstanding letters of credit, $560.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $688.0 million under the 2021 credit facility. As of December 31, 2023 and December 31, 2022, the revolving credit facility had a carrying value of $554.8 million and $443.2 million, respectively, net of deferred financing costs. As of December 31, 2023 and December 31, 2022, the term loan facilities had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

In October 2022, we entered into a term loan agreement, referred to as the 2022 term loan. The 2022 term loan was repaid in full in September 2023. The 2022 term loan consisted of a $425.0 million term loan with a maturity date of October 6, 2023. The 2022 term loan had one six-month as-of-right extension option to April 6, 2024. We also had an option, subject to customary conditions, to increase the capacity of the 2022 term loan to $500.0 million on or before January 7, 2023 without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. In January 2023, the 2022 term loan was increased by $25.0 million to $425.0 million.

The 2022 term loan bore interest at a spread over adjusted Term SOFR plus 10 basis points, ranging from 100 basis points to 180 basis points, in each case based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. In instances where there were either only two ratings available or where there was more than two and the difference between them was one rating category, the applicable rating was the highest rating. In instances where there were more than two ratings and the difference between the highest and the lowest were two or more rating categories, then the applicable rating used was the average of the highest two, rounded down if the average was not a recognized category. As of December 31, 2022, the 2022 term loan had a carrying value of $398.2 million, net of deferred financing costs.

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2023 and 2022, respectively, by scheduled maturity date (dollars in thousands):

	December 31, 2023				December 31, 2022
Issuance	Unpaid Principal Balance		Accreted Balance		Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025
	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(205)		(308)
	$	100,000	$	99,795	$	99,692

(1)Interest rate as of December 31, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors in a private placement.

Restrictive Covenants

The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2023 and 2022, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2023, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Company's Share of Joint Venture Debt
2024	$	4,488	$	382,750	$	—	$	200,000	$	—	$	—	$	587,238	$	1,822,978
2025	—		370,000		—		—		—		100,000		470,000		1,670,861
2026	—		190,148		—		—		—		—		190,148		542,968
2027	—		550,000		560,000		1,050,000		—		—		2,160,000		1,185,168
2028	—		—		—		—		—		—		—		—
Thereafter	—		—		—		—		100,000		—		100,000		2,130,300
Total	$	4,488	$	1,492,898	$	560,000	$	1,250,000	$	100,000	$	100,000	$	3,507,386	$	7,352,275

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest expense before capitalized interest	$	228,840	$	166,493	$	145,197
Interest on financing leases	4,446		4,555		5,448
Interest capitalized	(95,980)		(82,444)		(78,365)
Amortization of discount on assumed debt	2,842		1,855		—
Interest income	(3,034)		(986)		(1,389)
Interest expense, net	$	137,114	$	89,473	$	70,891

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Corporate Indebtedness

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Corporate Indebtedness

Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2023 and 2022, respectively, were as follows (dollars in thousands):

Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		December 31, 2023		December 31, 2022
Fixed Rate Debt:
420 Lexington Avenue	October 2024	October 2040		3.99%	$	277,238	$	283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
7 Dey / 185 Broadway	November 2025	November 2026		6.65%	190,148		200,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
719 Seventh Avenue					—		50,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,387,386	$	3,165,814
Floating Rate Debt:
690 Madison Avenue (3)	July 2024	July 2025	S+	0.50%	$	60,000	$	60,000
719 Seventh Avenue (3)	December 2024	December 2024	S+	1.31%	50,000		—
7 Dey / 185 Broadway					—		10,148
Total floating rate debt					$	110,000	$	70,148
Total mortgages and other loans payable					$	1,497,386	$	3,235,962
Deferred financing costs, net of amortization					(6,067)		(8,399)
Total mortgages and other loans payable, net					$	1,491,319	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

(3)Included in the Company's alternative strategy portfolio.

As of December 31, 2023 and 2022, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $1.9 billion and $3.8 billion, respectively.

Corporate Indebtedness

2021 Credit Facility

In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2023, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of December 31, 2023, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

As of December 31, 2023, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 165 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2023, the facility fee was 30 basis points.

As of December 31, 2023, we had $2.0 million of outstanding letters of credit, $560.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $688.0 million under the 2021 credit facility. As of December 31, 2023 and December 31, 2022, the revolving credit facility had a carrying value of $554.8 million and $443.2 million, respectively, net of deferred financing costs. As of December 31, 2023 and December 31, 2022, the term loan facilities had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

In October 2022, we entered into a term loan agreement, referred to as the 2022 term loan. The 2022 term loan was repaid in full in September 2023. The 2022 term loan consisted of a $425.0 million term loan with a maturity date of October 6, 2023. The 2022 term loan had one six-month as-of-right extension option to April 6, 2024. We also had an option, subject to customary conditions, to increase the capacity of the 2022 term loan to $500.0 million on or before January 7, 2023 without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. In January 2023, the 2022 term loan was increased by $25.0 million to $425.0 million.

The 2022 term loan bore interest at a spread over adjusted Term SOFR plus 10 basis points, ranging from 100 basis points to 180 basis points, in each case based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. In instances where there were either only two ratings available or where there was more than two and the difference between them was one rating category, the applicable rating was the highest rating. In instances where there were more than two ratings and the difference between the highest and the lowest were two or more rating categories, then the applicable rating used was the average of the highest two, rounded down if the average was not a recognized category. As of December 31, 2022, the 2022 term loan had a carrying value of $398.2 million, net of deferred financing costs.

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2023 and 2022, respectively, by scheduled maturity date (dollars in thousands):

	December 31, 2023				December 31, 2022
Issuance	Unpaid Principal Balance		Accreted Balance		Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025
	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(205)		(308)
	$	100,000	$	99,795	$	99,692

(1)Interest rate as of December 31, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors in a private placement.

Restrictive Covenants

The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2023 and 2022, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2023, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Company's Share of Joint Venture Debt
2024	$	4,488	$	382,750	$	—	$	200,000	$	—	$	—	$	587,238	$	1,822,978
2025	—		370,000		—		—		—		100,000		470,000		1,670,861
2026	—		190,148		—		—		—		—		190,148		542,968
2027	—		550,000		560,000		1,050,000		—		—		2,160,000		1,185,168
2028	—		—		—		—		—		—		—		—
Thereafter	—		—		—		—		100,000		—		100,000		2,130,300
Total	$	4,488	$	1,492,898	$	560,000	$	1,250,000	$	100,000	$	100,000	$	3,507,386	$	7,352,275

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest expense before capitalized interest	$	228,840	$	166,493	$	145,197
Interest on financing leases	4,446		4,555		5,448
Interest capitalized	(95,980)		(82,444)		(78,365)
Amortization of discount on assumed debt	2,842		1,855		—
Interest income	(3,034)		(986)		(1,389)
Interest expense, net	$	137,114	$	89,473	$	70,891

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Related Party Transactions

12 Months Ended

Dec. 31, 2023

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Prior to 2023, Alliance Building Services, or Alliance, and its affiliates, which provide services to certain properties owned by us, were previously partially owned by Gary Green, a son of Stephen L. Green, who serves as a member and as the chairman emeritus of our Board of Directors. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements.

Income earned from the profit participation prior to 2023, which is included in Other income on the consolidated statements of operations, was $1.4 million and $1.7 million for the years ended December 31, 2022 and 2021, respectively. We also recorded expenses, inclusive of capitalized expenses, of $8.6 million and $14.0 million for these services (excluding services provided directly to tenants) for the years ended December 31, 2022 and 2021, respectively.

One Vanderbilt Avenue Investment

Our Chairman and CEO, Marc Holliday, and our former President, Andrew Mathias, made investments in our One Vanderbilt project (inclusive of the property and SUMMIT One Vanderbilt), which entitles Mr. Holliday and Mr. Mathias to receive approximately 1.27% and 0.85%, respectively, on account of the property and 1.92% and 1.28%, respectively, on account of SUMMIT One Vanderbilt, of any profits realized by the Company from its One Vanderbilt project in excess of the Company's capital contributions. Mr. Holliday and Mr. Mathias paid $1.4 million and $1.0 million, respectively, which equaled the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

Messrs. Holliday and Mathias have the right to tender their interests in the project upon stabilization (50% within three years after stabilization and 100% three years or more after stabilization). In addition, the agreement calls for us to repurchase these interests in the event of a sale of One Vanderbilt or a transactional change of control of the Company. We also have the right to repurchase these interests on the 7-year anniversary of the stabilization of the project or upon the occurrence of certain separation events prior to the stabilization of the project relating to each of Messrs. Holliday’s and Mathias’s continued service with us. The price paid upon a tender of the interests will equal the liquidation value of the interests at the time, with the value being based on the project's sale price, if applicable, or fair market value as determined by an independent third party appraiser. In 2022, stabilization of the property (but not SUMMIT One Vanderbilt) was achieved. Therefore, Messrs. Holiday and Mathias exercised their rights to tender 50% of their interests in the property (but not SUMMIT One Vanderbilt) for liquidation values of $17.9 million and $11.9 million, respectively, which were paid in July 2022.

One Vanderbilt Avenue Leases

In November 2018, we entered into a lease agreement with the One Vanderbilt Avenue joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the years ended December 31, 2023 and 2022 we recorded $3.0 million and $3.0 million, respectively, of rent expense under the lease. Additionally, in June 2021, we, through a consolidated subsidiary, entered into a lease agreement with the One Vanderbilt Avenue joint venture for SUMMIT One Vanderbilt, which commenced operations in October 2021. For the year ended December 31, 2023, we recorded $38.9 million of rent expense under the lease, including percentage rent, of which $26.2 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the year ended December 31, 2022, we recorded $33.0 million of rent expense under the lease, including percentage rent, of which $22.8 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. See Note 20, "Commitments and Contingencies."

Other

We are entitled to receive fees for providing management, leasing, construction supervision, and asset management services to certain of our joint ventures as further described in Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures and related parties as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Due from joint ventures	$	10,603	$	26,812
Other	1,565		540
Related party receivables	$	12,168	$	27,352

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Noncontrolling Interests on the Company's Consolidated Financial Statements

12 Months Ended

Dec. 31, 2023

Noncontrolling Interest [Abstract]

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.

Common Units of Limited Partnership Interest in the Operating Partnership

As of December 31, 2023 and 2022, the noncontrolling interest unit holders owned 5.75%, or 3,949,448 units, and 5.39%, or 3,670,343 units, of the Operating Partnership, respectively. As of December 31, 2023, 3,949,448 shares of our common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership.

Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of our common stock at the end of the reporting period.

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	269,993	$	344,252
Distributions	(14,779)		(16,272)
Issuance of common units	25,365		22,855
Redemption and conversion of common units	(18,589)		(40,901)
Net loss	(37,465)		(5,794)
Accumulated other comprehensive income allocation	(1,960)		5,827
Fair value adjustment	15,486		(39,974)
Balance at end of period	$	238,051	$	269,993

Preferred Units of Limited Partnership Interest in the Operating Partnership

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of December 31, 2023:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	5.00	%	109,161	109,161	109,161	$	50.0000	$	1,000.00	$	—	August 2015
Series F	7.00	%	60	60	60	70.0000		1,000.00		29.12		January 2007
Series K	3.50	%	700,000	563,954	341,677	0.8750		25.00		134.67		August 2014
Series L	4.00	%	500,000	378,634	372,634	1.0000		25.00		—		August 2014
Series R	3.50	%	400,000	400,000	400,000	0.8750		25.00		154.89		August 2015
Series S	4.00	%	1,077,280	1,077,280	1,077,280	1.0000		25.00		—		August 2015
Series V (5)	5.00	%	40,000	40,000	40,000	1.2500		25.00		—		May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified.

(3)If applicable, units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, after July 15, 2024 at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As such, no Subsidiary Series B Preferred Units have been issued as of December 31, 2023.

(5)The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	177,943	$	196,075
Issuance of preferred units	—		—
Redemption of preferred units	(11,700)		(17,967)
Dividends paid on preferred units	(6,271)		(6,198)
Accrued dividends on preferred units	6,529		6,033
Balance at end of period	$	166,501	$	177,943

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Stockholders' Equity of the Company

12 Months Ended

Dec. 31, 2023

Stockholders' Equity Note [Abstract]

Stockholders' Equity of the Company

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2023, 64,726,253 shares of common stock and no shares of excess stock were issued and outstanding.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, for the years ended December 31, 2023, 2022 and 2021 as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719
Year ended 2023	—	$—	36,107,719

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at par for cash. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")

In February 2021, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2023, 2022, and 2021, respectively (dollars in thousands):

	Year Ended December 31,
	2023		2022		2021
Shares of common stock issued	17,180		10,839		10,387
Dividend reinvestments/stock purchases under the DRSPP	$	525	$	525	$	738

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the years ended December 31, 2023, 2022, and 2021 are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(582,164)	$	(95,243)	$	432,214
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,039
Add back: undistributed earnings allocated to participating securities	—		—		192
Add back: effect of dilutive securities (redemption of units to common shares)	(37,465)		(5,794)		25,457
(Loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(619,629)	$	(101,037)	$	459,902

	Year Ended December 31,
Denominator	2023	2022	2021
Basic Shares:
Weighted average common stock outstanding	63,809	63,917	65,740
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,163	4,012	3,987
Stock-based compensation plans	—	—	705
Contingently issuable shares	—	—	337
Diluted weighted average common stock outstanding	67,972	67,929	70,769

The Company has excluded 1,273,417 common stock equivalents from the calculation of diluted shares outstanding for the year ended December 31, 2023. The Company has excluded 1,682,236 and 948,017 of common stock equivalents from the calculation of diluted shares outstanding for the years ended December 31, 2022 and 2021, respectively.

Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2023 owned 64,726,253 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such 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 the Company 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. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.

Limited Partner Units

As of December 31, 2023, limited partners other than SL Green owned 5.75%, or 3,949,448 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the years ended December 31, 2023, 2022, and 2021 respectively are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(616,974)	$	(98,818)	$	460,261
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(619,629)	$	(101,037)	$	457,671
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,590
(Loss) income attributable to SLGOP common unitholders	$	(619,629)	$	(101,037)	$	460,261

	Year Ended December 31,
Denominator	2023	2022	2021
Basic units:
Weighted average common units outstanding	67,972	67,929	69,667
Effect of Dilutive Securities:
Stock-based compensation plans	—	—	765
Contingently issuable units	—	—	337
Diluted weighted average common units outstanding	67,972	67,929	70,769

The Operating Partnership has excluded 1,273,417 common unit equivalents from the diluted units outstanding for the years ended December 31, 2023. The Operating Partnership has excluded 1,682,236 and 948,017 common unit equivalents from the diluted units outstanding for the years ended December 31, 2022 and 2021, respectively.

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Partners' Capital of the Operating Partnership

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Partners' Capital of the Operating Partnership

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2023, 64,726,253 shares of common stock and no shares of excess stock were issued and outstanding.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, for the years ended December 31, 2023, 2022 and 2021 as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719
Year ended 2023	—	$—	36,107,719

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at par for cash. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")

In February 2021, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2023, 2022, and 2021, respectively (dollars in thousands):

	Year Ended December 31,
	2023		2022		2021
Shares of common stock issued	17,180		10,839		10,387
Dividend reinvestments/stock purchases under the DRSPP	$	525	$	525	$	738

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the years ended December 31, 2023, 2022, and 2021 are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(582,164)	$	(95,243)	$	432,214
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,039
Add back: undistributed earnings allocated to participating securities	—		—		192
Add back: effect of dilutive securities (redemption of units to common shares)	(37,465)		(5,794)		25,457
(Loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(619,629)	$	(101,037)	$	459,902

	Year Ended December 31,
Denominator	2023	2022	2021
Basic Shares:
Weighted average common stock outstanding	63,809	63,917	65,740
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,163	4,012	3,987
Stock-based compensation plans	—	—	705
Contingently issuable shares	—	—	337
Diluted weighted average common stock outstanding	67,972	67,929	70,769

The Company has excluded 1,273,417 common stock equivalents from the calculation of diluted shares outstanding for the year ended December 31, 2023. The Company has excluded 1,682,236 and 948,017 of common stock equivalents from the calculation of diluted shares outstanding for the years ended December 31, 2022 and 2021, respectively.

Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2023 owned 64,726,253 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such 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 the Company 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. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.

Limited Partner Units

As of December 31, 2023, limited partners other than SL Green owned 5.75%, or 3,949,448 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the years ended December 31, 2023, 2022, and 2021 respectively are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(616,974)	$	(98,818)	$	460,261
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(619,629)	$	(101,037)	$	457,671
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,590
(Loss) income attributable to SLGOP common unitholders	$	(619,629)	$	(101,037)	$	460,261

	Year Ended December 31,
Denominator	2023	2022	2021
Basic units:
Weighted average common units outstanding	67,972	67,929	69,667
Effect of Dilutive Securities:
Stock-based compensation plans	—	—	765
Contingently issuable units	—	—	337
Diluted weighted average common units outstanding	67,972	67,929	70,769

The Operating Partnership has excluded 1,273,417 common unit equivalents from the diluted units outstanding for the years ended December 31, 2023. The Operating Partnership has excluded 1,682,236 and 948,017 common unit equivalents from the diluted units outstanding for the years ended December 31, 2022 and 2021, respectively.

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Share-based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Share-based Compensation

Share-based Compensation

We have share-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.

The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 32,210,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.59 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.84 fungible units per share subject to such awards, and (3) all other awards (e.g., 10-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fifth amendment and restatement in June 2022 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 32,210,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of our common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's Board of Directors, new awards may be granted under the 2005 Plan until June 1, 2032, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of December 31, 2023, 3.9 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units.

Stock Options and Class O LTIP Units

Options are granted with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership.

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information. There were no options granted during the years ended December 31, 2023, 2022, and 2021.

A summary of the status of the Company's stock options as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023			2022			2021
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of year	313,480	$	97.59	394,089	$	100.56	761,686	$	105.76
Exercised	—	—		—	—		(11,314)	72.30
Lapsed or canceled	(197,500)	84.14		(80,609)	112.14		(356,283)	112.56
Balance at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56
Options exercisable at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56

The remaining weighted average contractual life of the options outstanding was 3.0 years and the remaining average contractual life of the options exercisable was 3.0 years.

During the years ended December 31, 2023, 2022, and 2021, we recognized no compensation expense related to options. As of December 31, 2023, there was no unrecognized compensation cost related to unvested stock options.

Restricted Shares

Shares are granted to certain employees, including our executives, and vesting occurs upon the completion of a service period or our meeting established financial performance criteria. Vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	3,758,174		3,459,363		3,337,545
Granted	337,350		314,995		141,515
Canceled	(6,350)		(16,184)		(19,697)
Balance at end of year	4,089,174		3,758,174		3,459,363
Vested during the year	147,915		118,255		122,759
Compensation expense recorded	$	7,766,055	$	10,133,905	$	8,497,054
Total fair value of restricted stock granted during the year	$	15,789,540	$	16,804,931	$	9,214,531

The fair value of restricted stock that vested during the years ended December 31, 2023, 2022, and 2021 was $10.2 million, $9.7 million and $11.3 million, respectively. As of December 31, 2023, there was $20.2 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.3 years.

We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $38.1 million and $45.0 million during the years ended December 31, 2023 and 2022, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third-party consultant determined that the fair value of the LTIP Units has a discount to our common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of December 31, 2023, there was $27.1 million of total unrecognized compensation expense related to the time-based and performance-based awards, which is expected to be recognized over a weighted average period of 1.6 years.

During the years ended December 31, 2023, 2022, and 2021, we recorded compensation expense related to bonus, time-based and performance-based awards of $50.4 million, $43.5 million, and $41.9 million, respectively.

For the years ended December 31, 2023, 2022, and 2021, $1.4 million, $1.8 million, and $2.1 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of our common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the year ended December 31, 2023, 39,302 phantom stock units and 27,739 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.7 million during the year ended December 31, 2023 related to the Deferred Compensation Plan. As of December 31, 2023, there were 230,295 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

Employee Stock Purchase Plan

In 2007, the Company's Board of Directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to provide equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of December 31, 2023, 224,159 shares of our common stock had been issued under the ESPP.

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income by component as of December 31, 2023, 2022 and 2021 (in thousands):

	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized (loss) gain on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income (loss) before reclassifications	14,908		(18,015)		96		(3,011)
Amounts reclassified from accumulated other comprehensive loss	16,626		6,874		—		23,500
Balance at December 31, 2021	(25,881)		(21,994)		1,117		(46,758)
Other comprehensive income (loss) before reclassifications	78,300		23,405		(1,359)		100,346
Amounts reclassified from accumulated other comprehensive income	(4,619)		635		—		(3,984)
Balance at December 31, 2022	47,800		2,046		(242)		49,604
Other comprehensive (loss) income before reclassifications	17,269		6,950		(1,549)		22,670
Amounts reclassified from accumulated other comprehensive income	(39,717)		(15,080)		—		(54,797)
Balance at December 31, 2023	$	25,352	$	(6,084)	$	(1,791)	$	17,477

(1)Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of December 31, 2023 and 2022, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.4 million) and ($0.5 million), respectively.

(2)Amount reclassified from accumulated other comprehensive income is included in equity in net loss from unconsolidated joint ventures in the respective consolidated statements of operations.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

We are required to disclose fair value information with regard to certain of our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of certain financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	9,591	$	—	$	9,591	$	—
Interest rate cap and swap agreements (included in Other assets)	$	33,456	$	—	$	33,456	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	17,108	$	—	$	17,108	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	11,240	$	—	$	11,240	$	—
Interest rate cap and swap agreements (included in Other assets)	$	57,660	$	—	$	57,660	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	10,142	$	—	$	10,142	$	—

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

In September 2022, the Company recorded at fair value the assets acquired and liabilities assumed at 245 Park Avenue. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts, all of which are classified as Level 3 inputs.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following table provides the carrying value and fair value of these financial instruments as of December 31, 2023 and December 31, 2022 (in thousands):

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	346,745	(2)		$	623,280	(2)
Fixed rate debt	$	3,237,386	$	3,184,338	$	5,015,814	$	4,784,691
Variable rate debt (3)	270,000		268,787		520,148		519,669
Total debt	$	3,507,386	$	3,453,125	$	5,535,962	$	5,304,360

(1)Amounts exclude net deferred financing costs.

(2)As of December 31, 2023, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. As of December 31, 2022, debt and preferred equity investments had an estimated fair value ranging between $0.6 billion and $0.6 billion.

(3)As of December 31, 2023, variable rate debt with a carrying value of $110.0 million and fair value of $108.6 million is included in the Company's alternative strategy portfolio.

Disclosures regarding fair value of financial instruments was based on pertinent information available to us as of December 31, 2023 and 2022. Such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

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Financial Instruments: Derivatives and Hedging

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments: Derivatives and Hedging

Financial Instruments: Derivatives and Hedging

In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheet at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

	Notional Value	Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	150,000	2.600	%	December 2021	January 2024	Other Assets	$	11
Interest Rate Swap	200,000	4.490	%	November 2022	January 2024	Other Assets	5
Interest Rate Swap	200,000	4.411	%	November 2022	January 2024	Other Assets	5
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Assets	3,158
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Liabilities	(3,145)
Interest Rate Swap	150,000	2.621	%	December 2021	January 2026	Other Assets	4,011
Interest Rate Swap	200,000	2.662	%	December 2021	January 2026	Other Assets	5,196
Interest Rate Swap	100,000	2.903	%	February 2023	February 2027	Other Assets	2,281
Interest Rate Swap	100,000	2.733	%	February 2023	February 2027	Other Assets	2,775
Interest Rate Swap	50,000	2.463	%	February 2023	February 2027	Other Assets	1,781
Interest Rate Swap	200,000	2.591	%	February 2023	February 2027	Other Assets	6,378
Interest Rate Swap	300,000	2.866	%	July 2023	May 2027	Other Assets	7,306
Interest Rate Swap	150,000	3.524	%	January 2024	May 2027	Other Assets	549
Interest Rate Swap	370,000	3.888	%	November 2022	June 2027	Other Liabilities	(3,044)
Interest Rate Swap	300,000	4.487	%	November 2024	November 2027	Other Liabilities	(10,273)
Interest Rate Swap	100,000	3.756	%	January 2023	January 2028	Other Liabilities	(646)
							$	16,348

During the year ended December 31, 2023, we recorded a loss of $10.4 million based on the changes in the fair value of an interest rate cap we sold and a forward-starting interest rate swap, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. During the year ended December 31, 2022, we recorded a loss of $1.7 million based on the changes in the fair value of an interest rate cap we sold. No interest rate caps were sold or forward-starting interest rate swaps entered into during the year ended December 31, 2021. During the years ended December 31, 2023, 2022, and 2021, we recorded losses of $0.2 million, $0.3 million, and $0.0 million, respectively, on the changes in the fair value, which is included in interest expense in the consolidated statements of operations.

Certain agreements the Company has with each of its derivative counterparties contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of December 31, 2023, the fair value of derivatives in a net liability position, including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $17.5 million. As of December 31, 2023, the Company was not required to post any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $18.3 million as of December 31, 2023.

Gains and losses on terminated hedges are included in accumulated other comprehensive income, and are recognized into earnings over the term of the related obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive income will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that ($32.5 million) of the current balance held in accumulated other comprehensive income will be reclassified into interest expense and ($7.6 million) of the portion related to our share of joint venture accumulated other comprehensive income (loss) will be reclassified into equity in net loss from unconsolidated joint ventures within the next 12 months.

The following table presents our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the years ended December 31, 2023, 2022, and 2021, respectively (in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income						Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
	Year Ended December 31,							Year Ended December 31,
Derivative	2023		2022		2021			2023		2022		2021
Interest Rate Swaps/Caps	$	18,484	$	83,162	$	15,643	Interest expense	$	42,270	$	4,989	$	(17,602)
Share of unconsolidated joint ventures' derivative instruments	7,399		24,783		(19,400)		Equity in net loss from unconsolidated joint ventures	16,050		(673)		(7,582)
	$	25,883	$	107,945	$	(3,757)		$	58,320	$	4,316	$	(25,184)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Cap	$	220,000	4.000	%	February 2023	February 2024	Asset	$	318
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,331
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,330
Interest Rate Cap	505,412		3.000	%	June 2023	June 2024	Asset	4,948
Interest Rate Cap	272,000		4.000	%	August 2023	August 2024	Asset	1,675
Interest Rate Cap	477,783		3.500	%	September 2023	September 2024	Asset	5,213
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,819
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,818
Interest Rate Swap	177,000		1.555	%	December 2022	February 2026	Asset	8,686
								$	43,034

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Lease Income

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lease Income

Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2023 are as follows (in thousands):

2024	$	496,311
2025	470,673
2026	426,247
2027	371,117
2028	316,789
Thereafter	1,339,758
	$	3,420,895

The components of lease income from operating leases in effect at December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Fixed lease payments	$	589,469	$	583,107	$	608,793
Variable lease payments	79,641		82,676		73,543
Total lease payments (1)	$	669,110	$	665,783	$	682,336
Amortization of acquired above and below-market leases	14,225		5,717		(4,160)
Total rental revenue	$	683,335	$	671,500	$	678,176

(1)Amounts include $196.5 million and $222.1 million of sublease income for the years ended December 31, 2023 and 2022, respectively.

The table below summarizes our investment in sales-type leases as of December 31, 2023:

Property	Year of Current Expiration	Year of Final Expiration (1)
15 Beekman (2)	2089	2089

(1)Reflects exercise of all available renewal options.

(2)In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures."

Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2023 are as follows (in thousands):

	Sales-type leases
2024	$	3,180
2025	3,228
2026	3,276
2027	3,325
2028	3,375
Thereafter	196,794
Total minimum lease payments	$	213,178
Amount representing interest	(107,544)
Investment in sales-type leases (1)	$	105,634

(1)This amount is included in Other assets in our consolidated balance sheets.

The components of lease income from sales-type leases during the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest income (1)	$	4,444	$	4,389	$	4,422

(1)These amounts are included in Other income in our consolidated statements of operations.

Lease Income

Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2023 are as follows (in thousands):

2024	$	496,311
2025	470,673
2026	426,247
2027	371,117
2028	316,789
Thereafter	1,339,758
	$	3,420,895

The components of lease income from operating leases in effect at December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Fixed lease payments	$	589,469	$	583,107	$	608,793
Variable lease payments	79,641		82,676		73,543
Total lease payments (1)	$	669,110	$	665,783	$	682,336
Amortization of acquired above and below-market leases	14,225		5,717		(4,160)
Total rental revenue	$	683,335	$	671,500	$	678,176

(1)Amounts include $196.5 million and $222.1 million of sublease income for the years ended December 31, 2023 and 2022, respectively.

The table below summarizes our investment in sales-type leases as of December 31, 2023:

Property	Year of Current Expiration	Year of Final Expiration (1)
15 Beekman (2)	2089	2089

(1)Reflects exercise of all available renewal options.

(2)In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures."

Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2023 are as follows (in thousands):

	Sales-type leases
2024	$	3,180
2025	3,228
2026	3,276
2027	3,325
2028	3,375
Thereafter	196,794
Total minimum lease payments	$	213,178
Amount representing interest	(107,544)
Investment in sales-type leases (1)	$	105,634

(1)This amount is included in Other assets in our consolidated balance sheets.

The components of lease income from sales-type leases during the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest income (1)	$	4,444	$	4,389	$	4,422

(1)These amounts are included in Other income in our consolidated statements of operations.

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Benefit Plans

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Benefit Plans

Benefit Plans

The building employees are covered by multi-employer defined benefit pension plans and post-retirement health and welfare plans. We participate in the Building Service 32BJ, or Union, Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employees. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2021, September 28, 2022 and September 28, 2023, the actuary certified that for the plan years beginning July 1, 2021, July 1, 2022 and July 1, 2023, the Pension Plan was in critical or endangered status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. No surcharges have been paid to the Pension Plan as of December 31, 2023. For the Pension Plan years ended June 30, 2023, 2022 and 2021, the plan received contributions from employers totaling $317.9 million, $305.7 million and $290.1 million, respectively. Our contributions to the Pension Plan represent less than 5.0% of total contributions to the plan.

The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the Health Plan years ended, June 30, 2023, 2022 and 2021, the plan received contributions from employers totaling $1.9 billion, $1.6 billion and $1.5 billion, respectively. Our contributions to the Health Plan represent less than 5.0% of total contributions to the plan.

Contributions we made to the multi-employer plans for the years ended December 31, 2023, 2022 and 2021 are included in the table below (in thousands):

	Year Ended December 31,
Benefit Plan	2023		2022		2021
Pension Plan	$	2,111	$	1,952	$	1,994
Health Plan	7,191		6,386		6,333
Other plans	789		807		849
Total plan contributions	$	10,091	$	9,145	$	9,176

401(K) Plan

In August 1997, we implemented a 401(K) Savings/Retirement Plan, or the 401(K) Plan, to cover eligible employees of ours, and any designated affiliate. The 401(K) Plan permits eligible employees to defer up to 15% of their annual compensation, subject to certain limitations imposed by the Code. The employees' elective deferrals are immediately vested and non-forfeitable upon contribution to the 401(K) Plan. During 2003, we amended our 401(K) Plan to provide for discretionary matching contributions only. For 2023, 2022 and 2021, a matching contribution equal to 100% of the first 4% of annual compensation was made. For the years ended December 31, 2023, 2022 and 2021, we made matching contributions of $1.8 million, $1.5 million, and $1.5 million, respectively.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

As of December 31, 2023, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

Environmental Matters

Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold.

Employment Agreements

We have entered into employment agreements with certain executives, which expire between January 2025 and January 2026. The minimum cash-based compensation associated with these employment agreements, which is comprised only of base salary, totals $2.4 million for 2024.

Insurance

We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR"), within two property insurance programs and liability insurance. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. However, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned by the Company or its affiliates.

Furthermore, with respect to certain of our properties, including properties held by joint ventures or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss.

Belmont had loss reserves of $3.3 million and $3.1 million as of December 31, 2023 and 2022, respectively. Ticonderoga had no loss reserves as of December 31, 2023 and 2022.

Lease Arrangements

We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2033 to 2119, or 2043 to 2119 as fully extended. Certain leases offer extension options which we assess against relevant economic factors to determine whether we are reasonably certain of exercising or not exercising the option. Lease payments associated with renewal periods that we are reasonably certain will be exercised, if any, are included in the measurement of the corresponding lease liability and right of use asset.

Certain of our leases are subject to rent resets, generally based on a percentage of the then fair market value, a fixed amount, or a percentage of the preceding rent at specified future dates. Rent resets will be recognized in the periods in which they are incurred. Additionally, certain of our leases are subject to percentage rent arrangements based on thresholds established in the lease agreement, such as percentage of sales at the property. Percentage rents will be recognized in the periods in which they are incurred.

The table below summarizes our current lease arrangements as of December 31, 2023:

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
711 Third Avenue (3)	2033	2083
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt Avenue (4)	2043	2048
420 Lexington Avenue	2050	2080
SUMMIT One Vanderbilt	2058	2070
15 Beekman (5)(6)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)The Company owns 50% of the fee interest.

(4)In March 2021, the Company commenced its lease for its corporate headquarters at One Vanderbilt Avenue. See note 10, "Related Party Transactions."

(5)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(6)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2023 (in thousands):

	Financing leases		Operating leases
2024	$	3,180	$	53,455
2025	3,228		53,595
2026	3,276		53,734
2027	3,325		53,746
2028	3,375		54,211
Thereafter	196,794		1,208,864
Total minimum lease payments	$	213,178	$	1,477,605
Amount representing interest	(107,647)		—
Amount discounted using incremental borrowing rate	—		(649,913)
Total lease liabilities excluding liabilities related to assets held for sale	$	105,531	$	827,692
Total lease liabilities	$	105,531	$	827,692

The following table provides lease cost information for the Company's operating leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
Operating Lease Costs	2023		2022		2021
Operating lease costs before capitalized operating lease costs	$	29,637	$	33,773	$	30,270
Operating lease costs capitalized	(2,345)		(6,830)		(3,716)
Operating lease costs, net (1)	$	27,292	$	26,943	$	26,554

(1)This amount is included in Operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
Financing Lease Costs	2023		2022		2021
Interest on financing leases before capitalized interest	$	4,446	$	4,555	$	5,448
Interest on financing leases capitalized	—		—		—
Interest on financing leases, net (1)	4,446		4,555		5,448
Amortization of right-of-use assets (2)	—		—		660
Financing lease costs, net	$	4,446	$	4,555	$	6,108

(1)These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in Depreciation and amortization in our consolidated statements of operations.

As of December 31, 2023, the weighted-average discount rate used to calculate the lease liabilities was 4.46%. As of December 31, 2023, the weighted-average remaining lease term was 28 years, inclusive of purchase options expected to be exercised.

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Segment Information

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has three reportable segments, real estate, debt and preferred equity investments, and SUMMIT. In the fourth quarter of 2023, due to quantitative thresholds, SUMMIT was identified as a reportable segment. As such, prior period segment data has been restated to reflect SUMMIT as a reportable segment for comparative purposes.

We evaluate real estate performance and allocate resources based on earnings contributions. The primary sources of revenue are generated from tenant rents, escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, insurance, real estate taxes and, at certain properties, ground rent expense. See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments. SUMMIT currently operates one location at One Vanderbilt Avenue in midtown Manhattan with the primary source of revenue generated from ticket sales.

Selected consolidated results of operations for the years ended December 31, 2023, 2022, and 2021, and selected asset information as of December 31, 2023 and 2022, regarding our operating segments are as follows (in thousands):

	Real Estate		SUMMIT		Debt and Preferred Equity		Total Company
Total revenues
Years ended:
December 31, 2023	$	760,745	$	118,260	$	34,705	$	913,710
December 31, 2022	749,293		89,048		81,113		919,454
December 31, 2021	764,659		16,311		80,340		861,310
Net (loss) income
Years ended:
December 31, 2023	$	(612,884)	$	6,101	$	7,446	$	(599,337)
December 31, 2022	(128,615)		(3,668)		55,980		(76,303)
December 31, 2021	413,401		(1,008)		68,239		480,632
Total assets
As of:
December 31, 2023	$	8,716,738	$	464,799	$	349,644	$	9,531,181
December 31, 2022	11,265,789		461,629		628,376		12,355,794

We allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment because that segment does not have dedicated personnel and the use of personnel and resources is dependent on transaction volume between the three segments, which varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. SUMMIT segment incurs its own marketing, general and administrative expenses for its dedicated personnel, which are included in SUMMIT Operator expenses in the consolidated statements of operations. For the years ended, December 31, 2023, 2022, and 2021 marketing, general and administrative expenses totaled $111.4 million, $93.8 million, and $94.9 million respectively. All other expenses, except interest and SUMMIT operator expenses, relate entirely to the real estate assets.

There were no transactions between the above three segments other than the SUMMIT lease with our One Vanderbilt Avenue joint venture, which is part of the real estate segment.

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Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III - Real Estate and Accumulated Depreciation

Column A	Column B		Column C Initial Cost				Column D Cost Capitalized Subsequent To Acquisition (1)				Column E Gross Amount at Which Carried at Close of Period						Column F		Column G	Column H	Column I
Description (2)	Encumbrances		Land		Building & Improvements		Land		Building & Improvements		Land		Building & Improvements (3)		Total		Accumulated Depreciation		Date of Construction	Date Acquired	Life on  Which Depreciation is Computed
420 Lexington Ave	$	277,238	$	—	$	333,499	$	—	$	242,766	$	—	$	576,265	$	576,265	$	227,258	1927	3/1998	Various
711 Third Avenue	—		19,844		115,769		—		72,821		19,844		188,590		208,434		91,897		1955	5/1998	Various
555 W. 57th Street	—		18,846		140,946		—		12,521		18,846		153,467		172,313		98,508		1971	1/1999	Various
461 Fifth Avenue	—		—		88,276		28,873		12,680		28,873		100,956		129,829		45,700		1988	10/2003	Various
750 Third Avenue	—		51,093		251,523		—		83,936		51,093		335,459		386,552		112,937		1958	7/2004	Various
485 Lexington Avenue	450,000		78,282		452,631		—		(15,086)		78,282		437,545		515,827		201,735		1956	12/2004	Various
810 Seventh Avenue	—		114,077		550,819		—		5,406		114,077		556,225		670,302		238,462		1970	1/2007	Various
1185 Avenue of the Americas	—		—		791,106		—		139,416		—		930,522		930,522		404,093		1969	1/2007	Various
1350 Avenue of the Americas	—		90,941		431,517		—		14,566		90,941		446,083		537,024		196,985		1966	1/2007	Various
1-6 Landmark Square (4)	100,000		27,852		161,343		(6,939)		(23,245)		20,913		138,098		159,011		46,789		1973-1984	1/2007	Various
7 Landmark Square (4)	—		1,721		8,417		(1,338)		(6,240)		383		2,177		2,560		695		2007	1/2007	Various
100 Church Street	370,000		34,994		183,932		—		11,060		34,994		194,992		229,986		78,305		1959	1/2010	Various
125 Park Avenue	—		120,900		270,598		—		23,312		120,900		293,910		414,810		129,990		1923	10/2010	Various
19 East 65th Street	—		8,603		2,074		—		3,345		8,603		5,419		14,022		7		1929	1/2012	Various
304 Park Avenue	—		54,489		90,643		—		9,096		54,489		99,739		154,228		33,134		1930	6/2012	Various
760 Madison Avenue	—		284,286		8,314		(2,450)		187,847		281,836		196,161		477,997		4,991		1996/2012	7/2014	Various
719 Seventh Avenue (5)(6)	50,000		41,180		46,232		—		(4,720)		41,180		41,512		82,692		5,986		1927	7/2014	Various
110 Greene Street	—		45,120		228,393		—		4,578		45,120		232,971		278,091		57,067		1910	7/2015	Various
7 Dey / 185 Broadway	190,148		45,540		27,865		—		207,635		45,540		235,500		281,040		12,200		1921	8/2015	Various
885 Third Avenue (7)	—		138,444		244,040		(138,444)		(125,747)		—		118,293		118,293		11,040		1986	7/2020	Various
690 Madison (6)	60,000		13,820		51,732		—		28		13,820		51,760		65,580		3,863		1879	9/2021	Various
Other (8)	—		20,635		16,224		2,302		611,561		22,937		627,785		650,722		33,669
Total	$	1,497,386	$	1,210,669	$	4,495,893	$	(117,996)	$	1,467,536	$	1,092,671	$	5,963,429	$	7,056,100	$	2,035,311

(1)Includes depreciable real estate reserves and impairments recorded subsequent to acquisition.

(2)All properties located in New York, New York unless otherwise noted.

(3)Includes right of use lease assets.

(4)Property located in Connecticut.

(5)We own a 75.0% interest in this property.

(6)Property is included in the Company's alternative strategy portfolio.

(7)In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

(8)Other includes a land development project, tenant improvements of eEmerge, capitalized interest and corporate improvements.

The changes in real estate for the years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	$	9,198,799	$	7,650,907	$	7,355,079
Property acquisitions	—		1,900,042		124,103
Improvements	241,213		335,413		296,876
Retirements/disposals/deconsolidation	(2,383,912)		(687,563)		(125,151)
Balance at end of year	$	7,056,100	$	9,198,799	$	7,650,907

The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes as of December 31, 2023 was $4.4 billion (unaudited).

The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	$	2,039,554	$	1,896,199	$	1,956,077
Depreciation for year	199,576		175,465		174,219
Retirements/disposals/deconsolidation	(203,819)		(32,110)		(234,097)
Balance at end of year	$	2,035,311	$	2,039,554	$	1,896,199

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Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Subsequent Events

Subsequent Events

In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest at 2 Herald for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024. See Note 6, "Investments in Unconsolidated Joint Ventures."

In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for a total consideration of $963.0 million.

Principles of Consolidation

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a VIE in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income (loss) attributed to controlling and noncontrolling interests.

We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights provided to each party and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.

Investment in Commercial Real Estate Properties

Investment in Commercial Real Estate Properties

Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.

We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their respective fair values on the acquisition date. When we acquire our partner's equity interest in an existing unconsolidated joint venture and gain control over the investment, we record the consolidated investment at fair value. The difference between the book value of our equity investment on the purchase date and our share of the fair value of the investment's purchase price is recorded as a purchase price fair value adjustment in our consolidated statements of operations. See Note 3, "Property Acquisitions."

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from 3 years to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from 1 year to 15 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from 1 year to 15 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2023, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 4.7 years, 8.1 years, and 3.1 years, respectively.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction.

Cash and Cash Equivalents

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

Investment in Marketable Securities

Investment in Marketable Securities

At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of December 31, 2023, we did not have any debt securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. Unless we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans.

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired at December 31, 2023.

We may originate loans for real estate acquisition, development and construction ("ADC loans"), where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments.

Deferred Lease Costs

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term. Certain of our employees provide leasing services to the wholly-owned properties.

Deferred Financing Costs

Deferred Financing Costs

Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close. Deferred financing costs related to a recognized debt liability are presented in the consolidated balance sheet as a direct deduction from the carrying amount of that debt liability.

Lease Classification

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Revenues from the sale of SUMMIT tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $2.6 million and $2.0 million, respectively, and is included in Deferred revenue on the consolidated balance sheets.

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

Rent Expense

Rent Expense

Rent expense is recognized on a straight-line basis over the initial term of the lease. The excess of the rent expense recognized over the amounts contractually due pursuant to the underlying lease is included in the lease liability - operating leases on the consolidated balance sheets.

Underwriting Commissions and Costs

Underwriting Commissions and Costs

Underwriting commissions and costs incurred in connection with our stock offerings are reflected as a reduction of additional paid-in-capital.

Transaction Costs

Transaction Costs

Transaction costs for real estate asset acquisitions are capitalized to the investment basis, which is then subject to a purchase price allocation based on relative fair value. Transaction costs for business combinations or costs incurred on potential transactions that are not consummated are expensed as incurred.

Income Taxes

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on its taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on its undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

We have elected, and may elect in the future, to treat certain of our corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal, state and local corporate tax liability for these entities. SUMMIT is held in a TRS and pays Federal, state and local taxes. During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax expense for SUMMIT of $9.2 million, $2.6 million, and $1.0 million, respectively.

During the years ended December 31, 2023, 2022 and 2021, we recorded Federal, state and local tax provisions of $8.2 million, $3.7 million, and $2.8 million, respectively. For the year ended December 31, 2023, the Company paid distributions on its common stock of $3.25 per share which represented $0.00 per share of ordinary income and $3.25 per share of capital gains. For the year ended December 31, 2022, the Company paid distributions on its common stock of $6.17 per share which represented $2.56 per share of ordinary income, and $1.17 per share of capital gains. For the year ended December 31, 2021, the Company paid distributions on its common stock of $8.09 per share which represented $0.50 per share of ordinary income and $5.92 per share of capital gains.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Stock Based Employee Compensation Plans

Stock Based Employee Compensation Plans

We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation."

For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of our Board of Directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable award date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.

The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options.

Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on either the grant date or the date immediately preceding the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date.

Derivative Instruments

Derivative Instruments

In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify for hedge accounting. Some derivative instruments are associated with an anticipated transaction. In those cases, hedge effectiveness criteria also require that it be probable that the underlying transaction occurs. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract.

To determine the fair values of derivative instruments, we use a variety of methods and assumptions that are based on market conditions and risks existing at each balance sheet date. For the majority of financial instruments including most derivatives, long-term investments and long-term debt, standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost, and termination cost are used to determine fair value. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized.

In the normal course of business, we are exposed to the effect of interest rate changes and limit these risks by following established risk management policies and procedures including the use of derivatives. To address exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices and manage the cost of borrowing obligations.

We use a variety of conventional derivative products. These derivatives include, but are not limited to, interest rate swaps, caps, collars and floors. We expressly prohibit the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors.

We may employ swaps, forwards or purchased options to hedge qualifying forecasted transactions. Gains and losses related to these transactions are deferred and recognized in net income as interest expense in the same period or periods that the underlying transaction occurs, expires or is otherwise terminated.

Hedges that are reported at fair value and presented on the balance sheet could be characterized as cash flow hedges or fair value hedges. Interest rate caps and collars are examples of cash flow hedges. Cash flow hedges address the risk associated with future cash flows of interest payments. For all hedges held by us that meet the hedging objectives established by our corporate policy governing interest rate risk management, no net gains or losses were reported in earnings. The changes in fair value of derivative instruments designated as hedge instruments are reflected in accumulated other comprehensive income. For derivative instruments not designated as hedging instruments, the gain or loss, resulting from the change in the estimated fair value of the derivative instruments, is recognized in current earnings during the period of change.

Earnings per Share of the Company

Earnings per Share of the Company

The Company presents both basic and diluted earnings per share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method.

Earnings per Unit of the Operating Partnership

Earnings per Unit of the Operating Partnership

The Operating Partnership presents both basic and diluted earnings per unit ("EPU") using the two-class method, which is an earnings allocation formula that determines EPU for common units and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPU is computed by dividing the income available to common unitholders by the weighted-average number of common units outstanding for the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries.

Reclassification

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

As of December 31, 2023, the SUMMIT meets the criteria of a reportable operating segment pursuant to the guidance in ASC 280. Accordingly, we reclassified SUMMIT Operator revenue, SUMMIT Operator expenses, and SUMMIT Operator tax expense to separate financial statement line items in our consolidated statements of operations. These items were previously presented on a net basis in Other income. Additionally, the depreciation and amortization of SUMMIT assets are included in Depreciation and amortization in our consolidated statements of operations. Prior period balances have been reclassified to conform to the current period presentation.

Accounting Standards Updates

Accounting Standards Updates

In December 2023, the FASB issued ASU No. 2023-09 Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The objective of the amendments in ASU 2023-09 related to the rate reconciliation and income taxes paid disclosures are to improve transparency of income tax disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, and income taxes paid disaggregated by jurisdiction. The amendment will require that public entities on an annual basis disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. Additionally, the amendment will require that all entities disclose on an annual basis the amount of taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes as well as disaggregated by individual jurisdictions that meet a quantitative threshold. ASU 2023-09 is effective prospectively for annual periods beginning after December 15, 2024. Early adoption and retrospective application is permitted. We are currently evaluating the impact of the adoption of ASU 2023-09 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In November 2023, the FASB issued ASU No. 2023-07 Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. ASU 2023-07 amends the reportable segment disclosure requirements to enhance disclosures about significant segment expenses. The objective of the amendment is to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. The amendment will require that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss (collectively referred to as the "significant expense principle"). Additionally, the amendment will require an entity to disclose an amount for "other segment items" by reportable segment and a description of its composition as well as require annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 in interim periods. Lastly, the amendment will require a public entity to disclose the title and position of the CODM and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding to allocate resources. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted and should be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating the impact of the adoption of ASU 2023-07 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. We are currently evaluating the impact of the adoption of ASU 2023-05 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements.

In July 2021, the FASB issued ASU No. 2021-05 Leases (Topic 842) Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 amends the lease classification requirements for lessors when classifying and accounting for a lease with variable lease payments that do not depend on a reference rate index or a rate. The update provides criteria, that if met, the lease would be classified and accounted for as an operating lease. ASU 2021-05 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on the Company's consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2024, which was extended from the original sunset date of December 31, 2022 when the FASB issued ASU No. 2022-06 in December 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the 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. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The impact of this guidance did not have a material impact on the Company's consolidated financial statements.

Fair Value Measurements

Fair Value Measurements

We are required to disclose fair value information with regard to certain of our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of certain financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

In September 2022, the Company recorded at fair value the assets acquired and liabilities assumed at 245 Park Avenue. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts, all of which are classified as Level 3 inputs.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

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Organization and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Interests in Investment Properties

On December 31, 2023, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Buildings		Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings		Approximate Square Feet (unaudited)		Weighted Average Leased Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	13	(2)	8,399,141	12	15,412,174	25	(2)	23,811,315	(2)	89.4	%
	Retail	3	(2)	40,536	7	281,796	10	(2)	322,332	(2)	91.2	%
	Development/Redevelopment	3	(3)	1,443,771	3	2,893,357	6	(2)	4,337,128	(2)	N/A
		19		9,883,448	22	18,587,327	41		28,470,775		89.5	%
Suburban	Office	7		862,800	—	—	7		862,800		77.1	%
Total commercial properties		26		10,746,248	22	18,587,327	48		29,333,575		89.0	%
Residential:
Manhattan	Residential	1	(3)	140,382	1	221,884	2		362,266		99.0	%
Total portfolio		27		10,886,630	23	18,809,211	50		29,695,841		89.2	%

(1)The weighted average leased occupancy for commercial properties represents the total leased square footage divided by the total square footage at acquisition.  The weighted average leased for residential properties represents the total leased units divided by the total available units. Properties under construction are not included in the calculation of weighted average leased occupancy.

(2)Includes assets within the Company's alternative strategy portfolio. Within that portfolio, office includes one building totaling 2,048,725 square feet, retail includes eight buildings totaling 286,738 square feet, and development/redevelopment includes two buildings totaling 1,496,931 square feet.

(3)As of December 31, 2023, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives

Properties other than Right of use assets - operating leases are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category	Term
Building (fee ownership)	40 years
Building improvements	shorter of remaining life of the building or useful life
Building (leasehold interest)	lesser of 40 years or remaining term of the lease
Right of use assets - financing leases	lesser of 40 years or remaining lease term
Furniture and fixtures	4 to 7 years
Tenant improvements	shorter of remaining term of the lease or useful life

Schedule of Identified Intangible Assets and Intangible Liabilities

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,902)		(190,066)
Net	$	4,778	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,089)		(212,191)
Net	$	3,305	$	149,147

Schedule of Estimated Annual Amortization of Acquired Above-market Leases, Net of Acquired Below-market Leases

The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands):    

2024	$	36
2025	234
2026	205
2027	184
2028	70

Schedule of Estimated Annual Amortization of all Other Identifiable Assets

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands):

2024	$	1,096
2025	728
2026	551
2027	312
2028	158

Schedule of Marketable Securities

As of December 31, 2023 and 2022, we held the following marketable securities (in thousands):

	December 31, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,591	$	11,240
Total investment in marketable securities	$	9,591	$	11,240

Schedule of Properties Contributed of Annualized Cash Rent

For the years ended December 31, 2023, 2022, and 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	2023	Property	2022	Property	2021
One Vanderbilt Avenue	16.0%	One Vanderbilt Avenue	14.1%	11 Madison Avenue	10.8%
11 Madison Avenue	8.3%	245 Park Avenue	10.0%	420 Lexington Avenue	8.3%
420 Lexington Avenue	6.7%	11 Madison Avenue	7.8%	1515 Broadway	8.1%
1515 Broadway	6.4%	420 Lexington Avenue	6.3%	1185 Avenue of the Americas	8.0%
1185 Avenue of the Americas	5.6%	1515 Broadway	5.8%	280 Park Avenue	6.7%
280 Park Avenue	5.5%	1185 Avenue of the Americas	5.1%	919 Third Avenue	5.3%
245 Park Avenue	5.5%	280 Park Avenue	5.1%	485 Lexington Avenue	5.3%
				555 West 57th Street	5.2%

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Property Acquisitions (Tables)

12 Months Ended

Dec. 31, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule of Properties Acquired

The following table summarizes the properties acquired during the year ended December 31, 2022:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
245 Park Avenue (1)	September 2022	Fee Interest	1,782,793	$	1,960.0

(1)On October 31, 2021, HNA, through an affiliated entity, filed for Chapter 11 bankruptcy protection on account of its investment in 245 Park Avenue, together with another asset in Chicago. On July 8, 2022, certain of the debtors and affiliates of SL Green entered into a Plan Sponsorship and Investment Agreement (the "Plan"). Since the debtors did not receive any qualifying bids for the property and the Plan was confirmed, SL Green acquired full ownership and control of the property in September 2022, at which time our outstanding preferred equity and accrued interest balance were credited to our equity investment in the property. We recorded the assets acquired and liabilities assumed at fair value. See Note 16, "Fair Value Measurements."

2021 Acquisitions

The following table summarizes the properties acquired during the year ended December 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9
461 Fifth Avenue (2)	June 2021	Fee Interest	200,000	28.0
1591-1597 Broadway	September 2021	Fee Interest	7,684	121.0
690 Madison Avenue (3)	September 2021	Fee Interest	7,848	72.2

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures."

(2)In April 2021, the Company exercised its option to acquire the fee interest in the property from the ground lessor and the Company acquired the fee interest in June 2021. The Company held the leasehold interest in the property prior to exercising its option.

(3)In September 2021, the Company was the successful bidder for the fee interest in 690 Madison Avenue at the foreclosure of the asset. The property previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value.

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Properties Held for Sale and Property Dispositions (Tables)

12 Months Ended

Dec. 31, 2023

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Properties Sold

The following table summarizes the properties sold during the years ended December 31, 2023, 2022, and 2021:

Property	Disposition Date	Property Type	Unaudited Approximate Usable Square Feet	Sales Price (1) (in millions)		(Loss) Gain on Sale (2) (in millions)
245 Park Avenue (3)	June 2023	Fee Interest	1,782,793	$	1,995.0	$	(28.3)
885 Third Avenue - Office Condominium Units (4)	December 2022	Fee / Leasehold Interest	414,317	300.4		(24.0)
609 Fifth Avenue	June 2022	Fee Interest	138,563	100.5		(80.2)
1591-1597 Broadway	May 2022	Fee Interest	7,684	121.0		(4.5)
1080 Amsterdam Avenue	April 2022	Leasehold Interest	85,250	42.7		17.9
707 Eleventh Avenue	February 2022	Fee Interest	159,720	95.0		(0.8)
110 East 42nd Street	December 2021	Fee Interest	215,400	117.1		3.6
590 Fifth Avenue	October 2021	Fee Interest	103,300	103.0		(3.2)
220 East 42nd Street (5)	July 2021	Fee Interest	1,135,000	783.5		175.1
635-641 Sixth Avenue	June 2021	Fee Interest	267,000	325.0		99.4
106 Spring Street (6)	March 2021	Fee Interest	5,928	35.0		(2.8)
133 Greene Street (6)	February 2021	Fee Interest	6,425	15.8		0.2
712 Madison Avenue (7)	January 2021	Fee Interest	6,600	43.0		(1.4)

(1)Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2)The (losses) gains on sale are net of $11.3 million, $11.2 million, and $13.7 million of employee compensation accrued in connection with the realization of the investment dispositions during the years ended December 31, 2023, 2022, and 2021, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) that is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture" and Note 16, " Fair Value Measurements."

(4)In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

(5)In July 2021, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million, which is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Ventures."

(6)In March 2021, the property was foreclosed by the lender.

(7)Disposition resulted from the ground lessee exercising its purchase option under a ground lease arrangement.

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Debt and Preferred Equity Investments (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of Activity in Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023			December 31, 2022
Balance at beginning of year (1)	$	623,280		$	1,088,723
Debt investment originations/fundings/accretion (2)	72,160			62,992
Preferred equity investment originations/accretion (2)	8,142			37,505
Redemptions/sales/syndications/equity ownership/amortization	(349,947)			(565,940)
Net change in loan loss reserves	(6,890)			—
Balance at end of period (1)	$	346,745	(3)	$	623,280

(1)Net of unamortized fees, discounts, and premiums.

(2)Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

Schedule of Debt and Preferred Equity Investments

Below is a summary of our debt and preferred equity investments as of December 31, 2023 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value			Senior Financing		Maturity(1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Mezzanine Debt	$	168,745	$	168,912	S + 4.95 - 12.38%	$	50,000	$	50,000	8.00 - 8.40%	$	218,745	(2)	$	1,071,858	2024 - 2029
Preferred Equity	—		—		—	128,000		128,000		6.5%	128,000			250,000		2027
Balance at end of period	$	168,745	$	168,912		$	178,000	$	178,000		$	346,745		$	1,321,858

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

(2)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

Schedule of Roll Forward of our Total Allowance for Loan Losses

The following table is a roll forward of our total allowance for loan losses for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
	2023			2022		2021
Balance at beginning of year	$	6,630		$	6,630	$	13,213
Current period provision for loan loss	6,890			—		—
Write-offs charged against the allowance	—			—		(6,583)
Balance at end of period	$	13,520	(1)	$	6,630	$	6,630

(1)As of December 31, 2023, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $49.8 million, which is included in the Company's alternative strategy portfolio.

Schedule of Carrying Value of Debt and Preferred Equity Investment Portfolio by Year of Origination and Risk Rating

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2023 and 2022 (dollars in thousands):

Risk Rating	December 31, 2023			December 31, 2022
1 - Low Risk Assets - Low probability of loss	$	210,333		$	264,069
2 - Watch List Assets - Higher potential for loss	136,412		(1)	352,321
3 - High Risk Assets - Loss more likely than not	—			6,890
	$	346,745		$	623,280

(1)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of December 31, 2023 (dollars in thousands):

	As of December 31,
Risk Rating	2023(1)		2022(1)		2021(1)		Prior(1)(2)			Total
1 - Low Risk Assets - Low probability of loss	$	—	$	—	$	—	$	210,333		$	210,333
2 - Watch List Assets - Higher potential for loss	—		—		—		136,412		(3)	136,412
3 - High Risk Assets - Loss more likely than not	—		—		—		—			—
	$	—	$	—	$	—	$	346,745		$	346,745

(1)Year in which the investment was originated or acquired by us or in which a material modification occurred.

(2)During the year ended December 31, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021.

(3)Includes two investments with a total carrying value of $49.8 million that are included in the Company's alternative strategy portfolio.

Schedule of Debt Investments with an Aggregate Weighted Average Current Yield

As of December 31, 2023 and 2022, we held the following debt investments with an aggregate weighted average current yield of 8.68% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Loan Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mezzanine Loan (3) (4) (6)	$	—	$	105,000	$	13,366	$	13,366	June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Mezzanine Loan	—		—		—		225,367
Mezzanine Loan	—		—		—		77,109
Total fixed rate	$	—	$	285,000	$	63,366	$	365,842
Floating Rate Investments:
Mezzanine Loan (5) (6)	$	—	$	275,000	$	50,000	$	50,000	April 2023
Mezzanine Loan	3,761		54,000		8,243		8,243		May 2024
Mezzanine Loan	2,655		271,774		62,333		46,884		May 2024
Mezzanine Loan	10,760		186,084		48,323		39,083		January 2026
Total floating rate	$	17,176	$	786,858	$	168,899	$	144,210
Allowance for loan loss	$	—	$	—	$	(13,520)	$	(6,630)
Total	$	17,176	$	1,071,858	$	218,745	$	503,422

(1)Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2)Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing.

(3)Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting, which is included in Other assets and Other liabilities on the consolidated balance sheets.

(4)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE, in which we are not the primary beneficiary.

(5)This loan went into default and was put on non-accrual in January 2023 and remains on non-accrual as of December 31, 2023. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower with respect to the loan.

(6)Included in the Company's alternative strategy portfolio.

Schedule of Preferred Equity Investments with an Aggregate Weighted Average Current Yield

As of December 31, 2023 and 2022, we held the following preferred equity investments with an aggregate weighted average current yield of 6.55% as of December 31, 2023 (dollars in thousands):

	December 31, 2023						December 31, 2022
Type	Future Funding Obligations		Senior Financing		Carrying Value (1)		Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	250,000	$	128,000	$	119,858	February 2027
Total	$	—	$	250,000	$	128,000	$	119,858

(1)Carrying value is net of deferred origination fees.

(2)Represents contractual redemption, excluding any unexercised extension options.

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Investments in Unconsolidated Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule of General Information on Joint Ventures and Investments in Unconsolidated Joint Ventures Sold

The table below provides general information on each of our joint ventures as of December 31, 2023:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue (2) (3)	Wharton Properties / Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street (2)	Private Investor / Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2) (4)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
650 Fifth Avenue (2) (5)	Wharton Properties	50.00%	50.00%	69,214
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
One Vanderbilt Avenue	National Pension Service of Korea / Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza (2)	RXR Realty / New York REIT	24.95%	24.95%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square (2) (6)	Israeli Institutional Investor	51.00%	51.00%	369,000
115 Spring Street (2)	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.27%	36.27%	12,946
One Madison Avenue (8)	National Pension Service of Korea / Hines Interest LP / International Investor	25.50%	25.50%	1,048,700
220 East 42nd Street	A fund managed by Meritz Alternative Investment Management	51.00%	51.00%	1,135,000
450 Park Avenue (9)	Korean Institutional Investor / Israeli Institutional Investor	50.10%	25.10%	337,000
5 Times Square (2)	RXR Realty led investment group	31.55%	31.55%	1,131,735
245 Park Avenue (10)	U.S. Affiliate of Mori Trust Co., Ltd	50.10%	50.10%	1,782,793
625 Madison Avenue (11)	Private Investor	90.43%	90.43%	563,000

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)Included in the Company's alternative strategy portfolio.

(3)In January 2024, together with its joint venture partner, the Company closed on the sale of the retail condominium at 717 Fifth Avenue for total consideration of $963.0 million.

(4)The joint venture owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. In December 2023, following an assessment of the investment for recoverability, the Company recorded a charge of $8.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(5)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(6)In December 2023, following an assessment of the property and the investment for recoverability, the Company recorded a charge of $101.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, the joint venture entered into an agreement to satisfy the existing $182.5 million mortgage on the property for a net payment of $7.0 million, which closed in February 2024.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at December 31, 2023 and 2022.

(9)The 50.1% ownership interest reflected in this table is comprised of our 25.1% economic interest and a 25.0% economic interest held by a third-party. The third-party's economic interest is held within a joint venture that we consolidate and recognize in Noncontrolling interests in other partnerships on our consolidated balance sheet. An additional third-party owns the remaining 49.9% economic interest in the property.

(10)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

(11)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments." In December 2023, together with its joint venture, the Company entered into a contract to sell the fee ownership in the property. In connection with this contract, the Company recorded a charge of $23.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. This transaction is expected to close in the first quarter of 2024.

The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2023, 2022, and 2021:

Property	Ownership Interest Sold	Disposition Date	Gross Asset Valuation (in millions)		(Loss) Gain on Sale (in millions) (1) (2)
21 East 66th Street	32.28%	December 2023	$	40.6	$	(12.7)
121 Greene Street	50.00%	February 2023	14.0		(0.3)
Stonehenge Portfolio	Various	April 2022	1.0		—
400 East 57th Street (3)	41.00%	September 2021	133.5		(1.0)
605 West 42nd Street - Sky	20.00%	June 2021	858.1		8.9
55 West 46th Street - Tower 46	25.00%	March 2021	275.0		(15.2)
885 Third Avenue (4)	N/A	January 2021	N/A		N/A

(1)Represents the Company's share of the gain or loss

(2)For the years ended December 31, 2023 and December 31, 2021, the (losses) gains on sale are net of $2.0 million and $1.4 million, respectively, of employee compensation accrued in connection with the realization of the investment dispositions. There was no amount accrued for employee compensation in the year ended December 31, 2022. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.

(3)In connection with our agreement to sell the property in April 2021, we recorded a charge of $5.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations.

(4)In January 2021, pursuant to the partnership documents, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases

The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of December 31, 2023 and 2022, respectively, are as follows (dollars in thousands):

							Principal Outstanding				Principal Outstanding
	Economic		Current Maturity	Final Maturity	Interest		December 31, 2023				December 31, 2022
Property	Interest (1)		Date	Date (2)	Rate (3)		Gross		SLG Share		Gross		SLG Share
Fixed Rate Debt:
717 Fifth Avenue (4)(5)	10.92	%	July 2022 (5)	July 2022 (5)		5.02%	$	655,328	$	71,536	$	655,328	$	71,536
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)		5.45%	65,000		32,500		65,000		32,500
220 East 42nd Street	51.00	%	June 2024	June 2025		5.86%	505,412		257,760		510,000		260,100
5 Times Square (4)	31.55	%	September 2024	September 2026		7.13%	477,783		150,740		400,000		126,200
10 East 53rd Street	55.00	%	February 2025	February 2025		5.45%	220,000		121,000		220,000		121,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93%	762,002		433,344		782,321		444,898
115 Spring Street (4)	51.00	%	March 2025	March 2025		5.50%	65,550		33,431		—		—
450 Park Avenue	25.10	%	June 2025	June 2027		6.10%	271,394		68,120		267,000		67,017
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84%	1,400,000		840,000		1,400,000		840,000
One Madison Avenue (7)	25.50	%	November 2025	November 2026		3.59%	733,103		186,941		467,008		119,087
800 Third Avenue	60.52	%	February 2026	February 2026		3.37%	177,000		107,120		177,000		107,120
919 Third Avenue	51.00	%	April 2026	April 2028		6.11%	500,000		255,000		500,000		255,000
625 Madison Avenue (8)	90.43	%	December 2026	December 2026		5.11%	199,987		180,848		—		—
245 Park Avenue	50.10	%	June 2027	June 2027		4.30%	1,768,000		885,768		—		—
Worldwide Plaza (4)	24.95	%	November 2027	November 2027		3.98%	1,200,000		299,400		1,200,000		299,400
One Vanderbilt Avenue	71.01	%	July 2031	July 2031		2.95%	3,000,000		2,130,300		3,000,000		2,130,300
280 Park Avenue							—		—		1,200,000		600,000
21 East 66th Street							—		—		12,000		3,874
Total fixed rate debt							$	12,000,559	$	6,053,808	$	10,855,657	$	5,478,032
Floating Rate Debt:
11 West 34th Street (4)	30.00	%	February 2023 (9)	February 2023 (9)	L+	1.45%	$	23,000	$	6,900	$	23,000	$	6,900
650 Fifth Avenue (4)	50.00	%	October 2023 (6)	January 2024 (6)	S+	2.25%	210,000		105,000		210,000		105,000
2 Herald Square (4)(10)	51.00	%	November 2023(10)	November 2023(10)	S+	2.06%	182,500		93,075		182,500		93,075
100 Park Avenue	49.90	%	January 2024 (11)	December 2025	S+	2.36%	360,000		179,640		360,000		179,640
15 Beekman (12)	20.00	%	January 2024 (13)	July 2025	S+	1.61%	124,137		24,827		86,738		17,348
1552 Broadway (4)	50.00	%	February 2024	February 2024	S+	2.75%	193,133		96,567		193,132		96,566
5 Times Square (4)	31.55	%	September 2024	September 2026	S+	5.65%	610,010		192,458		495,924		156,464
280 Park Avenue	50.00	%	September 2024	September 2024	S+	2.03%	1,200,000		600,000		—		—
21 East 66th Street							—		—		586		188
115 Spring Street							—		—		65,550		33,431
121 Greene Street							—		—		12,550		6,275
Total floating rate debt							$	2,902,780	$	1,298,467	$	1,629,980	$	694,887
Total joint venture mortgages and other loans payable							$	14,903,339	$	7,352,275	$	12,485,637	$	6,172,919
Deferred financing costs, net							(104,062)		(54,865)		(136,683)		(66,910)
Total joint venture mortgages and other loans payable, net							$	14,799,277	$	7,297,410	$	12,348,954	$	6,106,009

(1)Economic interest represents the Company's interests in the joint venture as of December 31, 2023. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property.

(3)Interest rates as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S").

(4)Included in the Company's alternative strategy portfolio.

(5)The asset was sold and associated debt repaid in January 2024.

(6)In January 2024, the maturity date of the loan was extended by two months to March 2024.

(7)The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. In July 2023, the facility was modified, which will allow the partnership to utilize the final tranche of the facility for an expanded range of uses, including additional amenities funded by construction cost savings and for hedging activities in contemplation of a permanent financing.

(8)Represents $168.9 million of loan principal and $31.1 million of accrued interest.

(9)The Company's joint venture partner is in discussions with the lender on resolution of the past maturity.

(10)The Company closed on the acquisition of additional interests in the joint venture in January 2024, which increased the Company's interest to 95%. In addition, the joint venture entered into an agreement to satisfy the existing mortgage for a net payment of $7.0 million, which closed in February 2024.

(11)The Company is in discussions with the lender to exercise the available extension option.

(12)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(13)In January 2024, the maturity date of the loan was extended to July 2024.

Schedule of Combined Balance Sheets for the Unconsolidated Joint Ventures

The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2023 and 2022, are as follows (in thousands):

	December 31, 2023		December 31, 2022
Assets (1)
Commercial real estate property, net	$	18,467,340	$	15,989,642
Cash and restricted cash	656,038		709,299
Tenant and other receivables, related party receivables, and deferred rents receivable	673,532		601,552
Other assets	2,584,765		2,551,426
Total assets	$	22,381,675	$	19,851,919
Liabilities and equity (1)
Mortgages and other loans payable, net	$	14,799,277	$	12,348,954
Deferred revenue	1,108,180		1,077,901
Lease liabilities	990,276		1,000,356
Other liabilities	447,705		456,537
Equity	5,036,237		4,968,171
Total liabilities and equity	$	22,381,675	$	19,851,919
Company's investments in unconsolidated joint ventures	$	2,983,313	$	3,190,137

(1)As of December 31, 2023, $545.6 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

Schedule of Combined Statements of Income for the Unconsolidated Joint Ventures

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the years ended December 31, 2023, 2022, and 2021 are as follows (unaudited, in thousands):

	Year Ended December 31,
	2023		2022		2021
Total revenues	$	1,525,044	$	1,339,364	$	1,228,364
Operating expenses	253,630		240,002		203,332
Real estate taxes	287,462		252,806		225,104
Operating lease rent	29,048		26,152		22,576
Interest expense, net of interest income	574,032		431,865		342,910
Amortization of deferred financing costs	28,157		27,754		31,423
Depreciation and amortization	516,466		465,100		484,130
Total expenses	$	1,688,795	$	1,443,679	$	1,309,475
Loss on early extinguishment of debt	—		(467)		(2,017)
Net loss before (loss) gain on sale	$	(163,751)	$	(104,782)	$	(83,128)
Company's equity in net loss from unconsolidated joint ventures	$	(76,509)	$	(57,958)	$	(55,402)

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Deferred Costs (Tables)

12 Months Ended

Dec. 31, 2023

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Deferred Costs

Deferred costs as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Deferred leasing costs	$	399,224	$	407,188
Less: accumulated amortization	(287,761)		(286,031)
Deferred costs, net	$	111,463	$	121,157

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Mortgages and Other Loans Payable (Tables)

12 Months Ended

Dec. 31, 2023

Mortgages and Other Loans Payable

Schedule of Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2023 and 2022, respectively, were as follows (dollars in thousands):

Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		December 31, 2023		December 31, 2022
Fixed Rate Debt:
420 Lexington Avenue	October 2024	October 2040		3.99%	$	277,238	$	283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
7 Dey / 185 Broadway	November 2025	November 2026		6.65%	190,148		200,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
719 Seventh Avenue					—		50,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,387,386	$	3,165,814
Floating Rate Debt:
690 Madison Avenue (3)	July 2024	July 2025	S+	0.50%	$	60,000	$	60,000
719 Seventh Avenue (3)	December 2024	December 2024	S+	1.31%	50,000		—
7 Dey / 185 Broadway					—		10,148
Total floating rate debt					$	110,000	$	70,148
Total mortgages and other loans payable					$	1,497,386	$	3,235,962
Deferred financing costs, net of amortization					(6,067)		(8,399)
Total mortgages and other loans payable, net					$	1,491,319	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of December 31, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

(3)Included in the Company's alternative strategy portfolio.

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Corporate Indebtedness (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of senior unsecured notes and other related disclosures by scheduled maturity date

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2023 and 2022, respectively, by scheduled maturity date (dollars in thousands):

	December 31, 2023				December 31, 2022
Issuance	Unpaid Principal Balance		Accreted Balance		Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025
	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(205)		(308)
	$	100,000	$	99,795	$	99,692

(1)Interest rate as of December 31, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors in a private placement.

Schedule of combined aggregate principal maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2023, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Company's Share of Joint Venture Debt
2024	$	4,488	$	382,750	$	—	$	200,000	$	—	$	—	$	587,238	$	1,822,978
2025	—		370,000		—		—		—		100,000		470,000		1,670,861
2026	—		190,148		—		—		—		—		190,148		542,968
2027	—		550,000		560,000		1,050,000		—		—		2,160,000		1,185,168
2028	—		—		—		—		—		—		—		—
Thereafter	—		—		—		—		100,000		—		100,000		2,130,300
Total	$	4,488	$	1,492,898	$	560,000	$	1,250,000	$	100,000	$	100,000	$	3,507,386	$	7,352,275

Schedule of consolidated interest expense, excluding capitalized interest

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest expense before capitalized interest	$	228,840	$	166,493	$	145,197
Interest on financing leases	4,446		4,555		5,448
Interest capitalized	(95,980)		(82,444)		(78,365)
Amortization of discount on assumed debt	2,842		1,855		—
Interest income	(3,034)		(986)		(1,389)
Interest expense, net	$	137,114	$	89,473	$	70,891

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2023

Related Party Transactions [Abstract]

Schedule of amounts due from/to related parties

Amounts due from joint ventures and related parties as of December 31, 2023 and 2022 consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Due from joint ventures	$	10,603	$	26,812
Other	1,565		540
Related party receivables	$	12,168	$	27,352

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Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)

12 Months Ended

Dec. 31, 2023

Noncontrolling Interest [Abstract]

Schedule of noncontrolling interest

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	269,993	$	344,252
Distributions	(14,779)		(16,272)
Issuance of common units	25,365		22,855
Redemption and conversion of common units	(18,589)		(40,901)
Net loss	(37,465)		(5,794)
Accumulated other comprehensive income allocation	(1,960)		5,827
Fair value adjustment	15,486		(39,974)
Balance at end of period	$	238,051	$	269,993

Schedule of preferred unit activity

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of December 31, 2023:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	5.00	%	109,161	109,161	109,161	$	50.0000	$	1,000.00	$	—	August 2015
Series F	7.00	%	60	60	60	70.0000		1,000.00		29.12		January 2007
Series K	3.50	%	700,000	563,954	341,677	0.8750		25.00		134.67		August 2014
Series L	4.00	%	500,000	378,634	372,634	1.0000		25.00		—		August 2014
Series R	3.50	%	400,000	400,000	400,000	0.8750		25.00		154.89		August 2015
Series S	4.00	%	1,077,280	1,077,280	1,077,280	1.0000		25.00		—		August 2015
Series V (5)	5.00	%	40,000	40,000	40,000	1.2500		25.00		—		May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified.

(3)If applicable, units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, after July 15, 2024 at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As such, no Subsidiary Series B Preferred Units have been issued as of December 31, 2023.

(5)The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the years ended December 31, 2023 and 2022 (in thousands):

	December 31, 2023		December 31, 2022
Balance at beginning of period	$	177,943	$	196,075
Issuance of preferred units	—		—
Redemption of preferred units	(11,700)		(17,967)
Dividends paid on preferred units	(6,271)		(6,198)
Accrued dividends on preferred units	6,529		6,033
Balance at end of period	$	166,501	$	177,943

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Stockholders' Equity of the Company (Tables)

12 Months Ended

Dec. 31, 2023

Stockholders' Equity Note [Abstract]

Class of treasury stock

The following table summarizes share repurchases executed under the program, excluding the redemption of OP units, for the years ended December 31, 2023, 2022 and 2021 as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719
Year ended 2023	—	$—	36,107,719

Schedule of common stock issued and proceeds received dividend reinvestments

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2023, 2022, and 2021, respectively (dollars in thousands):

	Year Ended December 31,
	2023		2022		2021
Shares of common stock issued	17,180		10,839		10,387
Dividend reinvestments/stock purchases under the DRSPP	$	525	$	525	$	738

Schedule of earnings per share

SL Green's earnings per share for the years ended December 31, 2023, 2022, and 2021 are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(579,509)	$	(93,024)	$	434,804
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(582,164)	$	(95,243)	$	432,214
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,039
Add back: undistributed earnings allocated to participating securities	—		—		192
Add back: effect of dilutive securities (redemption of units to common shares)	(37,465)		(5,794)		25,457
(Loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(619,629)	$	(101,037)	$	459,902

	Year Ended December 31,
Denominator	2023	2022	2021
Basic Shares:
Weighted average common stock outstanding	63,809	63,917	65,740
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,163	4,012	3,987
Stock-based compensation plans	—	—	705
Contingently issuable shares	—	—	337
Diluted weighted average common stock outstanding	67,972	67,929	70,769

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Partners' Capital of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

The Operating Partnership's earnings per unit for the years ended December 31, 2023, 2022, and 2021 respectively are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2023		2022		2021
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(616,974)	$	(98,818)	$	460,261
Less: distributed earnings allocated to participating securities	(2,655)		(2,219)		(2,398)
Less: undistributed earnings allocated to participating securities	—		—		(192)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(619,629)	$	(101,037)	$	457,671
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		—		2,590
(Loss) income attributable to SLGOP common unitholders	$	(619,629)	$	(101,037)	$	460,261

	Year Ended December 31,
Denominator	2023	2022	2021
Basic units:
Weighted average common units outstanding	67,972	67,929	69,667
Effect of Dilutive Securities:
Stock-based compensation plans	—	—	765
Contingently issuable units	—	—	337
Diluted weighted average common units outstanding	67,972	67,929	70,769

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Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of the status of stock options and changes during the period

A summary of the status of the Company's stock options as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023			2022			2021
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of year	313,480	$	97.59	394,089	$	100.56	761,686	$	105.76
Exercised	—	—		—	—		(11,314)	72.30
Lapsed or canceled	(197,500)	84.14		(80,609)	112.14		(356,283)	112.56
Balance at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56
Options exercisable at end of year	115,980	$	103.52	313,480	$	97.59	394,089	$	100.56

Schedule of other share-based compensation, activity

A summary of the Company's restricted stock as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:

	Year Ended December 31,
	2023		2022		2021
Balance at beginning of year	3,758,174		3,459,363		3,337,545
Granted	337,350		314,995		141,515
Canceled	(6,350)		(16,184)		(19,697)
Balance at end of year	4,089,174		3,758,174		3,459,363
Vested during the year	147,915		118,255		122,759
Compensation expense recorded	$	7,766,055	$	10,133,905	$	8,497,054
Total fair value of restricted stock granted during the year	$	15,789,540	$	16,804,931	$	9,214,531

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of accumulated other comprehensive income

The following tables set forth the changes in accumulated other comprehensive income by component as of December 31, 2023, 2022 and 2021 (in thousands):

	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized (loss) gain on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income (loss) before reclassifications	14,908		(18,015)		96		(3,011)
Amounts reclassified from accumulated other comprehensive loss	16,626		6,874		—		23,500
Balance at December 31, 2021	(25,881)		(21,994)		1,117		(46,758)
Other comprehensive income (loss) before reclassifications	78,300		23,405		(1,359)		100,346
Amounts reclassified from accumulated other comprehensive income	(4,619)		635		—		(3,984)
Balance at December 31, 2022	47,800		2,046		(242)		49,604
Other comprehensive (loss) income before reclassifications	17,269		6,950		(1,549)		22,670
Amounts reclassified from accumulated other comprehensive income	(39,717)		(15,080)		—		(54,797)
Balance at December 31, 2023	$	25,352	$	(6,084)	$	(1,791)	$	17,477

(1)Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of December 31, 2023 and 2022, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.4 million) and ($0.5 million), respectively.

(2)Amount reclassified from accumulated other comprehensive income is included in equity in net loss from unconsolidated joint ventures in the respective consolidated statements of operations.

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair value measurements, recurring and nonrecurring

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy as of December 31, 2023 and 2022 (in thousands):

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	9,591	$	—	$	9,591	$	—
Interest rate cap and swap agreements (included in Other assets)	$	33,456	$	—	$	33,456	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	17,108	$	—	$	17,108	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	11,240	$	—	$	11,240	$	—
Interest rate cap and swap agreements (included in Other assets)	$	57,660	$	—	$	57,660	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	10,142	$	—	$	10,142	$	—

Fair value, by balance sheet grouping

The following table provides the carrying value and fair value of these financial instruments as of December 31, 2023 and December 31, 2022 (in thousands):

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	346,745	(2)		$	623,280	(2)
Fixed rate debt	$	3,237,386	$	3,184,338	$	5,015,814	$	4,784,691
Variable rate debt (3)	270,000		268,787		520,148		519,669
Total debt	$	3,507,386	$	3,453,125	$	5,535,962	$	5,304,360

(1)Amounts exclude net deferred financing costs.

(2)As of December 31, 2023, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. As of December 31, 2022, debt and preferred equity investments had an estimated fair value ranging between $0.6 billion and $0.6 billion.

(3)As of December 31, 2023, variable rate debt with a carrying value of $110.0 million and fair value of $108.6 million is included in the Company's alternative strategy portfolio.

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Financial Instruments: Derivatives and Hedging (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional and fair value of derivative financial instruments and foreign currency hedges

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

	Notional Value	Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	150,000	2.600	%	December 2021	January 2024	Other Assets	$	11
Interest Rate Swap	200,000	4.490	%	November 2022	January 2024	Other Assets	5
Interest Rate Swap	200,000	4.411	%	November 2022	January 2024	Other Assets	5
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Assets	3,158
Interest Rate Cap	370,000	3.250	%	June 2023	June 2024	Other Liabilities	(3,145)
Interest Rate Swap	150,000	2.621	%	December 2021	January 2026	Other Assets	4,011
Interest Rate Swap	200,000	2.662	%	December 2021	January 2026	Other Assets	5,196
Interest Rate Swap	100,000	2.903	%	February 2023	February 2027	Other Assets	2,281
Interest Rate Swap	100,000	2.733	%	February 2023	February 2027	Other Assets	2,775
Interest Rate Swap	50,000	2.463	%	February 2023	February 2027	Other Assets	1,781
Interest Rate Swap	200,000	2.591	%	February 2023	February 2027	Other Assets	6,378
Interest Rate Swap	300,000	2.866	%	July 2023	May 2027	Other Assets	7,306
Interest Rate Swap	150,000	3.524	%	January 2024	May 2027	Other Assets	549
Interest Rate Swap	370,000	3.888	%	November 2022	June 2027	Other Liabilities	(3,044)
Interest Rate Swap	300,000	4.487	%	November 2024	November 2027	Other Liabilities	(10,273)
Interest Rate Swap	100,000	3.756	%	January 2023	January 2028	Other Liabilities	(646)
							$	16,348

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2023 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Cap	$	220,000	4.000	%	February 2023	February 2024	Asset	$	318
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,331
Interest Rate Cap	484,069		0.490	%	February 2022	May 2024	Asset	8,330
Interest Rate Cap	505,412		3.000	%	June 2023	June 2024	Asset	4,948
Interest Rate Cap	272,000		4.000	%	August 2023	August 2024	Asset	1,675
Interest Rate Cap	477,783		3.500	%	September 2023	September 2024	Asset	5,213
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Cap	278,161		4.000	%	May 2024	November 2024	Asset	948
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,819
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	1,818
Interest Rate Swap	177,000		1.555	%	December 2022	February 2026	Asset	8,686
								$	43,034

Schedule of effect of derivative financial instruments on consolidated statements of income

The following table presents our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the years ended December 31, 2023, 2022, and 2021, respectively (in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income						Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
	Year Ended December 31,							Year Ended December 31,
Derivative	2023		2022		2021			2023		2022		2021
Interest Rate Swaps/Caps	$	18,484	$	83,162	$	15,643	Interest expense	$	42,270	$	4,989	$	(17,602)
Share of unconsolidated joint ventures' derivative instruments	7,399		24,783		(19,400)		Equity in net loss from unconsolidated joint ventures	16,050		(673)		(7,582)
	$	25,883	$	107,945	$	(3,757)		$	58,320	$	4,316	$	(25,184)

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Lease Income (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lessor, operating lease, payments to be received, maturity

Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2023 are as follows (in thousands):

2024	$	496,311
2025	470,673
2026	426,247
2027	371,117
2028	316,789
Thereafter	1,339,758
	$	3,420,895

Operating lease, lease income

The components of lease income from operating leases in effect at December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Fixed lease payments	$	589,469	$	583,107	$	608,793
Variable lease payments	79,641		82,676		73,543
Total lease payments (1)	$	669,110	$	665,783	$	682,336
Amortization of acquired above and below-market leases	14,225		5,717		(4,160)
Total rental revenue	$	683,335	$	671,500	$	678,176

(1)Amounts include $196.5 million and $222.1 million of sublease income for the years ended December 31, 2023 and 2022, respectively.

Schedule of sales type leases

The table below summarizes our investment in sales-type leases as of December 31, 2023:

Property	Year of Current Expiration	Year of Final Expiration (1)
15 Beekman (2)	2089	2089

(1)Reflects exercise of all available renewal options.

(2)In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures."

Sales-type lease, lease income

The components of lease income from sales-type leases during the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):

	Year Ended December 31,
	2023		2022		2021
Interest income (1)	$	4,444	$	4,389	$	4,422

(1)These amounts are included in Other income in our consolidated statements of operations.

Sales-type and direct financing leases, lease receivable, maturity

Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2023 are as follows (in thousands):

	Sales-type leases
2024	$	3,180
2025	3,228
2026	3,276
2027	3,325
2028	3,375
Thereafter	196,794
Total minimum lease payments	$	213,178
Amount representing interest	(107,544)
Investment in sales-type leases (1)	$	105,634

(1)This amount is included in Other assets in our consolidated balance sheets.

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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Schedule of contributions made to multi-employer plans

Contributions we made to the multi-employer plans for the years ended December 31, 2023, 2022 and 2021 are included in the table below (in thousands):

	Year Ended December 31,
Benefit Plan	2023		2022		2021
Pension Plan	$	2,111	$	1,952	$	1,994
Health Plan	7,191		6,386		6,333
Other plans	789		807		849
Total plan contributions	$	10,091	$	9,145	$	9,176

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of ground lease arrangements

The table below summarizes our current lease arrangements as of December 31, 2023:

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
711 Third Avenue (3)	2033	2083
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt Avenue (4)	2043	2048
420 Lexington Avenue	2050	2080
SUMMIT One Vanderbilt	2058	2070
15 Beekman (5)(6)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)The Company owns 50% of the fee interest.

(4)In March 2021, the Company commenced its lease for its corporate headquarters at One Vanderbilt Avenue. See note 10, "Related Party Transactions."

(5)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(6)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

Finance lease, liability, maturity

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2023 (in thousands):

	Financing leases		Operating leases
2024	$	3,180	$	53,455
2025	3,228		53,595
2026	3,276		53,734
2027	3,325		53,746
2028	3,375		54,211
Thereafter	196,794		1,208,864
Total minimum lease payments	$	213,178	$	1,477,605
Amount representing interest	(107,647)		—
Amount discounted using incremental borrowing rate	—		(649,913)
Total lease liabilities excluding liabilities related to assets held for sale	$	105,531	$	827,692
Total lease liabilities	$	105,531	$	827,692

Schedule of future minimum rental payments for operating leases

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2023 (in thousands):

	Financing leases		Operating leases
2024	$	3,180	$	53,455
2025	3,228		53,595
2026	3,276		53,734
2027	3,325		53,746
2028	3,375		54,211
Thereafter	196,794		1,208,864
Total minimum lease payments	$	213,178	$	1,477,605
Amount representing interest	(107,647)		—
Amount discounted using incremental borrowing rate	—		(649,913)
Total lease liabilities excluding liabilities related to assets held for sale	$	105,531	$	827,692
Total lease liabilities	$	105,531	$	827,692

Lease, cost

The following table provides lease cost information for the Company's operating leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
Operating Lease Costs	2023		2022		2021
Operating lease costs before capitalized operating lease costs	$	29,637	$	33,773	$	30,270
Operating lease costs capitalized	(2,345)		(6,830)		(3,716)
Operating lease costs, net (1)	$	27,292	$	26,943	$	26,554

(1)This amount is included in Operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the years ended December 31, 2023, 2022 and 2021 (in thousands):

	Year Ended December 31,
Financing Lease Costs	2023		2022		2021
Interest on financing leases before capitalized interest	$	4,446	$	4,555	$	5,448
Interest on financing leases capitalized	—		—		—
Interest on financing leases, net (1)	4,446		4,555		5,448
Amortization of right-of-use assets (2)	—		—		660
Financing lease costs, net	$	4,446	$	4,555	$	6,108

(1)These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in Depreciation and amortization in our consolidated statements of operations.

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of selected results of operations and selected asset information

Selected consolidated results of operations for the years ended December 31, 2023, 2022, and 2021, and selected asset information as of December 31, 2023 and 2022, regarding our operating segments are as follows (in thousands):

	Real Estate		SUMMIT		Debt and Preferred Equity		Total Company
Total revenues
Years ended:
December 31, 2023	$	760,745	$	118,260	$	34,705	$	913,710
December 31, 2022	749,293		89,048		81,113		919,454
December 31, 2021	764,659		16,311		80,340		861,310
Net (loss) income
Years ended:
December 31, 2023	$	(612,884)	$	6,101	$	7,446	$	(599,337)
December 31, 2022	(128,615)		(3,668)		55,980		(76,303)
December 31, 2021	413,401		(1,008)		68,239		480,632
Total assets
As of:
December 31, 2023	$	8,716,738	$	464,799	$	349,644	$	9,531,181
December 31, 2022	11,265,789		461,629		628,376		12,355,794

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Organization and Basis of Presentation - Narrative (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) ft² building shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Organization
Number of Buildings | building		50
Approximate Square Feet | ft²		29,695,841
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares		1
Mortgages and other loans payable, net		$ 1,491,319,000	$ 3,227,563,000
Repayments of mortgages		25,826,000	292,364,000	$ 375,044,000
Due from joint ventures
Organization
Mortgages and other loans payable, net		$ 14,799,277,000	12,348,954,000
2 Herald Square | Due from joint ventures | Subsequent Event
Organization
Consideration transferred	$ 0
Investment in joint venture, ownership percentage	95.00%
Mortgages and other loans payable, net	$ 182,500,000
Repayments of mortgages	7,000,000
717 Fifth Avenue | Due from joint ventures | Subsequent Event
Organization
Gross Asset Valuation	$ 963,000,000
Managed Office Properties
Organization
Approximate Square Feet | ft²		400,000
Debt and preferred equity investments including investments held by unconsolidated joint ventures		$ 346,700,000
Debt and preferred equity investments and other financing receivables included in other balance sheet items		$ 7,900,000
Office
Organization
Number of Buildings | building		1
Retail building
Organization
Number of Buildings | building		1
SL Green Operating Partnership
Organization
Mortgages and other loans payable, net		$ 1,491,319,000	3,227,563,000
Repayments of mortgages		$ 25,826,000	$ 292,364,000	$ 375,044,000
Service Corporation
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)		95.00%
SLG Management LLC | SL Green Management
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)		100.00%
Operating Partnership | SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)		5.75%	5.39%

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Organization and Basis of Presentation - Schedule of Interests in Investment Properties (Details)	Dec. 31, 2023 ft² building
Real estate properties
Number of Buildings | building	50
Approximate Square Feet	29,695,841
Weighted Average Occupancy (as a percent)	89.20%
Manhattan
Real estate properties
Number of Buildings | building	41
Approximate Square Feet	28,470,775
Weighted Average Occupancy (as a percent)	89.50%
Commercial Property
Real estate properties
Number of Buildings | building	48
Approximate Square Feet	29,333,575
Weighted Average Occupancy (as a percent)	89.00%
Office | Alternative strategy portfolio
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	2,048,725
Office | Manhattan
Real estate properties
Number of Buildings | building	25
Approximate Square Feet	23,811,315
Weighted Average Occupancy (as a percent)	89.40%
Office | Suburban
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	862,800
Weighted Average Occupancy (as a percent)	77.10%
Retail | Alternative strategy portfolio
Real estate properties
Number of Buildings | building	8
Approximate Square Feet	286,738
Retail | Manhattan
Real estate properties
Number of Buildings | building	10
Approximate Square Feet	322,332
Weighted Average Occupancy (as a percent)	91.20%
Development/Redevelopment | Alternative strategy portfolio
Real estate properties
Number of Buildings | building	2
Approximate Square Feet	1,496,931
Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	6
Approximate Square Feet	4,337,128
Residential | Manhattan
Real estate properties
Number of Buildings | building	2
Approximate Square Feet	362,266
Weighted Average Occupancy (as a percent)	99.00%
Consolidated
Real estate properties
Number of Buildings | building	27
Approximate Square Feet	10,886,630
Consolidated | Manhattan
Real estate properties
Number of Buildings | building	19
Approximate Square Feet	9,883,448
Consolidated | Commercial Property
Real estate properties
Number of Buildings | building	26
Approximate Square Feet	10,746,248
Consolidated | Office | Manhattan
Real estate properties
Number of Buildings | building	13
Approximate Square Feet	8,399,141
Consolidated | Office | Suburban
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	862,800
Consolidated | Retail | Manhattan
Real estate properties
Number of Buildings | building	3
Approximate Square Feet	40,536
Consolidated | Retail | Manhattan | 7 Dey/185 Broadway
Real estate properties
Approximate Square Feet	140,382
Consolidated | Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	3
Approximate Square Feet	1,443,771
Consolidated | Residential | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	140,382
Consolidated | Residential | Manhattan | 7 Dey/185 Broadway
Real estate properties
Approximate Square Feet	50,206
Unconsolidated
Real estate properties
Number of Buildings | building	23
Approximate Square Feet	18,809,211
Unconsolidated | Manhattan
Real estate properties
Number of Buildings | building	22
Approximate Square Feet	18,587,327
Unconsolidated | Commercial Property
Real estate properties
Number of Buildings | building	22
Approximate Square Feet	18,587,327
Unconsolidated | Office | Manhattan
Real estate properties
Number of Buildings | building	12
Approximate Square Feet	15,412,174
Unconsolidated | Office | Suburban
Real estate properties
Number of Buildings | building	0
Approximate Square Feet	0
Unconsolidated | Retail | Manhattan
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	281,796
Unconsolidated | Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	3
Approximate Square Feet	2,893,357
Unconsolidated | Residential | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	221,884

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Significant Accounting Policies - Investment in Commercial Real Estate Properties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Weighted average amortization period, above-market lease costs	4 years 8 months 12 days
Weighted average amortization period, below-market lease costs	8 years 1 month 6 days
Weighted average amortization period, in-place lease costs	3 years 1 month 6 days
Period from cessation of major construction activity to completion of construction project, maximum	1 year
Minimum | Above Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Below Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | In Place Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Building
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Maximum | Above Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Below Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | In Place Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Building
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	40 years

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Significant Accounting Policies - Schedule of Estimated Useful Lives (Details)	Dec. 31, 2023
Building (fee ownership)
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Building (leasehold interest) | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Right of use assets - financing leases | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Furniture and fixtures | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	7 years
Furniture and fixtures | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	4 years

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Significant Accounting Policies - Depreciation and Amortization of Right of Use Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 01, 2022	Jun. 30, 2022	Dec. 31, 2020
Franchisor Disclosure [Line Items]
Depreciation expense (including amortization of the capital lease asset)	$ 221,000,000	$ 190,100,000	$ 187,300,000
Carrying value of investment in leasehold interest	7,056,100,000	9,198,799,000	7,650,907,000			$ 7,355,079,000
Amortization of above and below Market Leases	14,200,000	$ 5,700,000	$ 4,200,000
625 Madison Avenue
Franchisor Disclosure [Line Items]
Operating lease rent				$ 20,250,000	$ 4,610,000
Write down of value in leasehold interest	249,500,000
Carrying value of investment in leasehold interest	$ 0

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Significant Accounting Policies - Schedule of Identified Intangible Assets and Intangible Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$ 189,680	$ 403,552
Accumulated amortization	(184,902)	(190,066)
Net	4,778	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	205,394	361,338
Accumulated amortization	(202,089)	(212,191)
Net	$ 3,305	$ 149,147

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Significant Accounting Policies - Schedule of Estimated Annual Amortization of Acquired Above-market Leases, Net of Acquired Below-market Leases (Details) - Acquired Above-market Leases, Net of Acquired Below-market Leases $ in Thousands	Dec. 31, 2023 USD ($)
Real Estate [Line Items]
2024	$ 36
2025	234
2026	205
2027	184
2028	$ 70

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Significant Accounting Policies - Schedule of Estimated Annual Amortization of all Other Identifiable Assets (Details) - Other Identifiable Assets $ in Thousands	Dec. 31, 2023 USD ($)
Real Estate [Line Items]
2024	$ 1,096
2025	728
2026	551
2027	312
2028	$ 158

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Significant Accounting Policies - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment in Marketable Securities
Marketable securities available-for-sale	$ 9,591	$ 11,240
Total investment in marketable securities	9,591	11,240
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities available-for-sale	$ 9,591	$ 11,240

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Significant Accounting Policies - Investment in Marketable Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) marketableSecurity security
Real Estate [Line Items]
Proceeds from sale of marketable securities		$ 7,800,000	$ 0
Number of marketable securities sold | security		1
Proceeds from the repayment of debt marketable securities		$ 3,700,000	$ 4,500,000
Number of securities repaid | security		1	1
Equity marketable securities	$ 0	$ 0
Number of securities sold | marketableSecurity			1
Proceeds from sale of equity marketable securities	4,200,000		$ 0
Marketable securities, realized loss		6,500,000
Marketable securities, unrealized gain			$ 600,000
Commercial mortgage-backed securities
Real Estate [Line Items]
Cost basis of commercial mortgage backed securities	11,500,000	11,500,000
Unrealized loss	1,900,000	300,000
Fair value of security in a continuous unrealized loss position for less than 12 months	$ 9,600,000	$ 11,200,000

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Significant Accounting Policies - Deferred Lease Costs (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Portion of compensation capitalized	$ 6.8	$ 6.6	$ 6.2
Estimated average lease term (in years)	7 years

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Significant Accounting Policies - Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Revenue Arrangement By Type Table [Line Items]
Days past due for income recognition on debt and preferred equity investments to be suspended	90 days
Deferred revenue	$ 134,053	$ 272,248
Unused and Unexpired Tickets
Deferred Revenue Arrangement By Type Table [Line Items]
Deferred revenue	$ 2,600	$ 2,000

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Significant Accounting Policies - Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividends Payable [Line Items]
SUMMIT Operator tax expense	$ 9,201	$ 2,647	$ 1,000
Federal, state and local tax provision	$ 8,200	$ 3,700	$ 2,800
Dividends per share paid (in dollars per share)	$ 3.25	$ 6.17	$ 8.09
Ordinary Income Dividend
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)	0.00	2.56	0.50
Capital Gains Dividend
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)	$ 3.25	$ 1.17	$ 5.92

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Significant Accounting Policies - Concentrations of Credit Risk (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 agreement tenant
Annualized Rent | Customer Concentration
Concentration of Credit Risk
Number of tenants (tenants) | tenant	1
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%
Annualized Rent | Customer Concentration | Tenant 1
Concentration of Credit Risk
Percentage of concentration (percent)	5.90%
Collective Bargaining Arrangements | Workforce Concentration
Concentration of Credit Risk
Percentage of concentration (percent)	57.60%
Number of collective bargaining agreements | agreement	5
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Workforce Concentration
Concentration of Credit Risk
Percentage of concentration (percent)	1.30%

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Significant Accounting Policies - Schedule of Properties Contributed of Annualized Cash Rent (Details) - Annualized Rent - Customer Concentration	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
One Vanderbilt Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	16.00%	14.10%
11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	8.30%	7.80%	10.80%
420 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	6.70%	6.30%	8.30%
1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	6.40%	5.80%	8.10%
1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	5.60%	5.10%	8.00%
280 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.50%	5.10%	6.70%
245 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.50%	10.00%
919 Third Avenue
Concentration of Credit Risk
Percentage of concentration (percent)			5.30%
485 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)			5.30%
555 West 57th Street
Concentration of Credit Risk
Percentage of concentration (percent)			5.20%

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Property Acquisitions - Schedule of Properties Acquired in 2022 (Details) $ in Millions	Dec. 31, 2023 ft²	Dec. 31, 2022 USD ($) ft²
Business Acquisition [Line Items]
Approximate Square Feet	29,695,841
245 Park Avenue
Business Acquisition [Line Items]
Approximate Square Feet		1,782,793
Gross Asset Valuation | $		$ 1,960.0

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Property Acquisitions - Schedule of Properties Acquired in 2021 (Details) $ in Millions	Dec. 31, 2023 ft²	Dec. 31, 2021 USD ($) ft²
Business Acquisition [Line Items]
Approximate Square Feet	29,695,841
885 Third Avenue
Business Acquisition [Line Items]
Approximate Square Feet		625,000
Gross Asset Valuation | $		$ 387.9
461 Fifth Avenue
Business Acquisition [Line Items]
Approximate Square Feet		200,000
Gross Asset Valuation | $		$ 28.0
1591-1597 Broadway
Business Acquisition [Line Items]
Approximate Square Feet		7,684
Gross Asset Valuation | $		$ 121.0
690 Madison Avenue
Business Acquisition [Line Items]
Approximate Square Feet		7,848
Gross Asset Valuation | $		$ 72.2

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Properties Held for Sale and Property Dispositions - Schedule of Properties Sold (Details)	1 Months Ended													12 Months Ended
	Jun. 30, 2023 USD ($) ft²	Dec. 31, 2022 USD ($) ft²	Jun. 30, 2022 USD ($) ft²	May 31, 2022 USD ($) ft²	Apr. 30, 2022 USD ($) ft²	Feb. 28, 2022 USD ($) ft²	Dec. 31, 2021 USD ($) ft²	Oct. 31, 2021 USD ($) ft²	Jul. 31, 2021 USD ($) ft²	Jun. 30, 2021 USD ($) ft²	Mar. 31, 2021 USD ($) ft²	Feb. 28, 2021 USD ($) ft²	Jan. 31, 2021 USD ($) ft²	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($) ft²
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²														29,695,841
Employee-related liabilities		$ 0					$ 1,400,000							$ 2,000,000	$ 0	$ 1,400,000
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag														investment dispositions	investment dispositions	investment dispositions
Ownership percentage deconsolidated	50.10%								51.00%
Investment fair value adjustment	$ 17,000,000								$ 206,800,000					$ 17,000,000
885 Third Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²		218,796													218,796
245 Park Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²	1,782,793
Sales price	$ 1,995,000,000
(Loss) Gain on Sale	$ (28,300,000)
Ownership interest disposed	49.90%
885 Third Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²		414,317													414,317
Sales price		$ 300,400,000													$ 300,400,000
(Loss) Gain on Sale		(24,000,000.0)
609 Fifth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²			138,563
Sales price			$ 100,500,000
(Loss) Gain on Sale			$ (80,200,000)
1591-1597 Broadway
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²				7,684
Sales price				$ 121,000,000.0
(Loss) Gain on Sale				$ (4,500,000)
1080 Amsterdam Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²					85,250
Sales price					$ 42,700,000
(Loss) Gain on Sale					$ 17,900,000
707 Eleventh Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²						159,720
Sales price						$ 95,000,000.0
(Loss) Gain on Sale						$ (800,000)
110 East 42nd Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²							215,400									215,400
Sales price							$ 117,100,000									$ 117,100,000
(Loss) Gain on Sale							3,600,000
590 Fifth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²								103,300
Sales price								$ 103,000,000.0
(Loss) Gain on Sale								$ (3,200,000)
220 East 42nd Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²									1,135,000
Sales price									$ 783,500,000
(Loss) Gain on Sale									$ 175,100,000
Ownership interest disposed	49.90%
635-641 Sixth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²										267,000
Sales price										$ 325,000,000.0
(Loss) Gain on Sale										$ 99,400,000
106 Spring Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²											5,928
Sales price											$ 35,000,000.0
(Loss) Gain on Sale											$ (2,800,000)
133 Greene Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²												6,425
Sales price												$ 15,800,000
(Loss) Gain on Sale												$ 200,000
712 Madison Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²													6,600
Sales price													$ 43,000,000.0
(Loss) Gain on Sale													$ (1,400,000)
Properties Sold in 2023, 2022, and 2021
Property Dispositions and Assets Held for Sale
Employee-related liabilities		$ 11,200,000					$ 13,700,000							$ 11,300,000	$ 11,200,000	$ 13,700,000

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Debt and Preferred Equity Investments - Schedule of Activity in Debt and Preferred Equity Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 623,280	$ 1,088,723
Redemptions/sales/syndications/equity ownership/amortization	(349,947)	(565,940)
Net change in loan loss reserves	(6,890)	0
Balance at end of period	$ 346,745	$ 623,280
Number of investments, nonperforming | investment	2	1
Carrying Value	$ 346,745	$ 623,280
Total floating rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Carrying Value	168,899	144,210
Total floating rate | Alternative strategy portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Carrying Value	49,800
Debt Investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	72,160	62,992
Preferred Equity Investments
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	$ 8,142	$ 37,505

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Debt and Preferred Equity Investments - Schedule of Debt and Preferred Equity Investments (Details) $ in Thousands	Dec. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment
Debt Instrument [Line Items]
Carrying Value	$ 346,745	$ 623,280
Senior Financing	$ 1,321,858
Number of investments, nonperforming | investment	2	1
Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 168,899	$ 144,210
Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	218,745
Senior Financing	1,071,858
Preferred Equity
Debt Instrument [Line Items]
Carrying Value	128,000
Senior Financing	250,000
Total floating rate
Debt Instrument [Line Items]
Carrying Value	168,745
Face Value	168,912
Total floating rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	168,745
Face Value	168,912
Total floating rate | Preferred Equity
Debt Instrument [Line Items]
Carrying Value	0
Face Value	$ 0
Basis spread on variable rate	0.00%
Total floating rate | LIBOR | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	4.95%
Total floating rate | LIBOR | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	12.38%
Fixed Rate
Debt Instrument [Line Items]
Carrying Value	$ 178,000
Face Value	178,000
Fixed Rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	50,000
Face Value	50,000
Fixed Rate | Preferred Equity
Debt Instrument [Line Items]
Carrying Value	128,000
Face Value	$ 128,000
Interest Rate	6.50%
Fixed Rate | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Interest Rate	8.00%
Fixed Rate | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Interest Rate	8.40%

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Debt and Preferred Equity Investments - Schedule of Roll Forward of our Total Allowance for Loan Losses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loan loss reserve activity
Balance at beginning of year	$ 6,630	$ 6,630	$ 13,213
Current period provision for loan loss	6,890	0	0
Write-offs charged against the allowance	0	0	(6,583)
Balance at end of period	$ 13,520	$ 6,630	$ 6,630
Number of financing receivables on non-accrual without allowance for loan loss | loan	1
Alternative strategy portfolio | Total floating rate
Loan loss reserve activity
Financing receivable on non-accrual without allowance	$ 49,800

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Debt and Preferred Equity Investments - Narrative (Details)	12 Months Ended			41 Months Ended
	Dec. 31, 2023 USD ($) investment security segment	Dec. 31, 2022 USD ($) segment investment	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) investment
Preferred equity investment
Number of investments, nonperforming | investment	2	1		2
Debt and preferred equity investments	$ 346,745,000	$ 623,280,000		$ 346,745,000
Recorded investment, past due	$ 346,745,000	$ 623,280,000		346,745,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Current period provision for loan loss	$ 6,890,000	$ 0	$ 2,931,000
Number financing receivable, nonaccrual status | security	1
Financing receivable, nonaccrual status	$ 5,600,000			5,600,000
Loan interest income				0
2 - Watch List Assets - Higher potential for loss
Preferred equity investment
Provision for loan loss recognized	6,900,000
Recorded investment, past due	136,412,000	352,321,000		136,412,000
Other Assets
Preferred equity investment
Total after allowance for loan loss	8,800,000	9,000,000		8,800,000
Current period provision for loan loss	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0	0		0
Floating Rate
Preferred equity investment
Debt and preferred equity investments	168,899,000	144,210,000		168,899,000
Mortgage Investment One | Floating Rate
Preferred equity investment
Debt and preferred equity investments		6,900,000
Three Mortgage Investments | Floating Rate
Preferred equity investment
Debt and preferred equity investments	49,800,000			49,800,000
Preferred Equity Investments
Preferred equity investment
Total after allowance for loan loss	$ 128,000,000	$ 119,858,000		$ 128,000,000

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Debt and Preferred Equity Investments - Schedule of Carrying Value of Debt and Preferred Equity Investment Portfolio by Year of Origination and Risk Rating (Details) $ in Thousands	Dec. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 0
2022	0
2021	0
Prior	346,745
Total	$ 346,745	$ 623,280
Number of investments, nonperforming | investment	2	1
Carrying Value	$ 346,745	$ 623,280
Total floating rate
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	168,899	144,210
1 - Low Risk Assets - Low probability of loss
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	210,333
Total	210,333	264,069
2 - Watch List Assets - Higher potential for loss
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	136,412
Total	136,412	352,321
3 - High Risk Assets - Loss more likely than not
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	0
Total	$ 0	$ 6,890

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Debt and Preferred Equity Investments - Schedule of Debt Investments with an Aggregate Weighted Average Current Yield (Details) - USD ($)	12 Months Ended	41 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate, interest rate	8.68%
Debt Investments Held [Abstract]
Carrying value at fixed rate	$ 346,745,000	$ 346,745,000	$ 623,280,000
Carrying Value	346,745,000	346,745,000	623,280,000
Allowance for loan loss	(13,520,000)	(13,520,000)	(6,630,000)	$ (6,630,000)	$ (13,213,000)
Loan interest income		0
Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Amount participated out	12,000,000	12,000,000
Debt Investment
Debt Investments Held [Abstract]
Future funding obligations	17,176,000	17,176,000
Senior financing	1,071,858,000	1,071,858,000
Carrying Value	218,745,000	218,745,000	503,422,000
Allowance for loan loss	(13,520,000)	(13,520,000)	(6,630,000)
Total fixed rate
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	285,000,000	285,000,000
Carrying value at fixed rate	63,366,000	63,366,000	365,842,000
Total fixed rate | Mezzanine Loan Due June 2023
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	105,000,000	105,000,000
Carrying value at fixed rate	13,366,000	13,366,000	13,366,000
Total fixed rate | Mezzanine Loan Due June 2024, 2
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	95,000,000	95,000,000
Carrying value at fixed rate	30,000,000	30,000,000	30,000,000
Total fixed rate | Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	85,000,000	85,000,000
Carrying value at fixed rate	20,000,000	20,000,000	20,000,000
Total fixed rate | Mezzanine Loan Due January 2025
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	0	0
Carrying value at fixed rate	0	0	225,367,000
Total fixed rate | Mezzanine Loan Due December 2029
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	0	0
Carrying value at fixed rate	0	0	77,109,000
Total floating rate
Debt Investments Held [Abstract]
Future funding obligations	17,176,000	17,176,000
Senior financing	786,858,000	786,858,000
Carrying Value	168,899,000	168,899,000	144,210,000
Total floating rate | Mezzanine Loan Due April 2023
Debt Investments Held [Abstract]
Future funding obligations	0	0
Senior financing	275,000,000	275,000,000
Carrying Value	50,000,000	50,000,000	50,000,000
Total floating rate | Mezzanine Loan Due May 2023
Debt Investments Held [Abstract]
Future funding obligations	3,761,000	3,761,000
Senior financing	54,000,000	54,000,000
Carrying Value	8,243,000	8,243,000	8,243,000
Total floating rate | Mezzanine Loan Due May 2023, 2
Debt Investments Held [Abstract]
Future funding obligations	2,655,000	2,655,000
Senior financing	271,774,000	271,774,000
Carrying Value	62,333,000	62,333,000	46,884,000
Total floating rate | Mezzanine Loan Due July 2023
Debt Investments Held [Abstract]
Future funding obligations	10,760,000	10,760,000
Senior financing	186,084,000	186,084,000
Carrying Value	$ 48,323,000	$ 48,323,000	$ 39,083,000

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Debt and Preferred Equity Investments - Schedule of Preferred Equity Investments with an Aggregate Weighted Average Current Yield (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Preferred equity investment
Mortgage loans on real estate, interest rate	8.68%
Carrying Value	$ 346,745	$ 623,280
Allowance for loan loss	$ (13,520)	(6,630)	$ (6,630)	$ (13,213)
Preferred Equity Investments
Preferred equity investment
Mortgage loans on real estate, interest rate	6.55%
Future funding obligations	$ 0
Senior financing	250,000
Total	128,000	119,858
Preferred Equity, February 2027
Preferred equity investment
Future funding obligations	0
Senior financing	250,000
Carrying Value	$ 128,000	$ 119,858
Preferred Equity
Preferred equity investment
Aggregate weighted average current yield	6.55%
Carrying Value	$ 128,000

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Investments in Unconsolidated Joint Ventures - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 2,983,313	$ 3,190,137
Net equity investment in VIEs in which the entity is not primary beneficiary	437,900	86,200
Total revenues	913,710	919,454	$ 861,310
Due from joint ventures
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	2,983,313
Equity method investments with negative book value	149,100
Total revenues	1,525,044	1,339,364	1,228,364
Due from joint ventures | Management Service, Base
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 21,100	$ 24,000	$ 19,600

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Investments in Unconsolidated Joint Ventures - Schedule of General Information on Joint Ventures (Details)	1 Months Ended					12 Months Ended
	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) ft²	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) ft²	Jul. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
General information on each joint venture
Approximate Square Feet		29,695,841				29,695,841
Depreciable real estate reserves and impairments | $						$ (382,374,000)	$ (6,313,000)	$ (23,794,000)
Mortgages and other loans payable, net | $		$ 1,491,319,000				1,491,319,000	3,227,563,000
Repayments of mortgages | $						25,826,000	292,364,000	$ 375,044,000
Ownership percentage deconsolidated				50.10%	51.00%
Investment fair value adjustment | $				$ 17,000,000	$ 206,800,000	17,000,000
245 Park Avenue
General information on each joint venture
Approximate Square Feet				1,782,793
Gross asset valuation of property to be sold | $				$ 1,995,000,000
Ownership interest disposed				49.90%
1552 Broadway
General information on each joint venture
Depreciable real estate reserves and impairments | $		8,100,000
2 Herald Square
General information on each joint venture
Depreciable real estate reserves and impairments | $		101,700,000
625 Madison Avenue
General information on each joint venture
Depreciable real estate reserves and impairments | $			$ 23,100,000
Due from joint ventures
General information on each joint venture
Mortgages and other loans payable, net | $		$ 14,799,277,000				$ 14,799,277,000	$ 12,348,954,000
Due from joint ventures | 717 Fifth Avenue | Subsequent Event
General information on each joint venture
Gross asset valuation of property to be sold | $	$ 963,000,000
Due from joint ventures | 2 Herald Square | Subsequent Event
General information on each joint venture
Consideration transferred | $	$ 0
Investment in joint venture, ownership percentage	95.00%
Mortgages and other loans payable, net | $	$ 182,500,000
Repayments of mortgages | $	$ 7,000,000
Prudential Real Estate Investors | Due from joint ventures | 100 Park Avenue
General information on each joint venture
Ownership Interest		49.90%				49.90%
Economic Interest (as a percent)		49.90%				49.90%
Approximate Square Feet		834,000				834,000
Wharton Properties / Private Investor | Due from joint ventures | 717 Fifth Avenue
General information on each joint venture
Ownership Interest		10.92%				10.92%
Economic Interest (as a percent)		10.92%				10.92%
Approximate Square Feet		119,500				119,500
Private Investors | Due from joint ventures | 800 Third Avenue
General information on each joint venture
Ownership Interest		60.52%				60.52%
Economic Interest (as a percent)		60.52%				60.52%
Approximate Square Feet		526,000				526,000
Private Investors | Due from joint ventures | 115 Spring Street (2)
General information on each joint venture
Ownership Interest		51.00%				51.00%
Economic Interest (as a percent)		51.00%				51.00%
Approximate Square Feet		5,218				5,218
Private Investors | Due from joint ventures | 625 Madison Avenue
General information on each joint venture
Ownership Interest		90.43%				90.43%
Economic Interest (as a percent)		90.43%				90.43%
Approximate Square Feet		563,000				563,000
New York State Teacher's Retirement System | Due from joint ventures | 919 Third Avenue
General information on each joint venture
Ownership Interest		51.00%				51.00%
Economic Interest (as a percent)		51.00%				51.00%
Approximate Square Feet		1,454,000				1,454,000
Private Investor / Wharton Properties | Due from joint ventures | 11 West 34th Street (2)
General information on each joint venture
Ownership Interest		30.00%				30.00%
Economic Interest (as a percent)		30.00%				30.00%
Approximate Square Feet		17,150				17,150
Vornado Realty Trust | Due from joint ventures | 280 Park Avenue
General information on each joint venture
Ownership Interest		50.00%				50.00%
Economic Interest (as a percent)		50.00%				50.00%
Approximate Square Feet		1,219,158				1,219,158
Wharton Properties | Due from joint ventures | 1552 Broadway
General information on each joint venture
Ownership Interest		50.00%				50.00%
Economic Interest (as a percent)		50.00%				50.00%
Approximate Square Feet		57,718				57,718
Wharton Properties | Due from joint ventures | 650 Fifth Avenue
General information on each joint venture
Ownership Interest		50.00%				50.00%
Economic Interest (as a percent)		50.00%				50.00%
Approximate Square Feet		69,214				69,214
Canadian Pension Plan Investment Board | Due from joint ventures | 10 East 53rd Street
General information on each joint venture
Ownership Interest		55.00%				55.00%
Economic Interest (as a percent)		55.00%				55.00%
Approximate Square Feet		354,300				354,300
PGIM Real Estate | Due from joint ventures | 11 Madison Avenue
General information on each joint venture
Ownership Interest		60.00%				60.00%
Economic Interest (as a percent)		60.00%				60.00%
Approximate Square Feet		2,314,000				2,314,000
National Pension Service of Korea / Hines Interest LP | Due from joint ventures | One Vanderbilt Avenue
General information on each joint venture
Ownership Interest		71.01%				71.01%
Economic Interest (as a percent)		71.01%				71.01%
Approximate Square Feet		1,657,198				1,657,198
RXR Realty / New York REIT | Due from joint ventures | Worldwide Plaza (4)
General information on each joint venture
Ownership Interest		24.95%				24.95%
Economic Interest (as a percent)		24.95%				24.95%
Approximate Square Feet		2,048,725				2,048,725
Allianz Real Estate of America | Due from joint ventures | 1515 Broadway
General information on each joint venture
Ownership Interest		56.87%				56.87%
Economic Interest (as a percent)		56.87%				56.87%
Approximate Square Feet		1,750,000				1,750,000
Israeli Institutional Investor | Due from joint ventures | 2 Herald Square
General information on each joint venture
Ownership Interest		51.00%				51.00%
Economic Interest (as a percent)		51.00%				51.00%
Approximate Square Feet		369,000				369,000
A fund managed by Meritz Alternative Investment Management | Due from joint ventures | 15 Beekman
General information on each joint venture
Ownership Interest		20.00%				20.00%
Economic Interest (as a percent)		20.00%				20.00%
Approximate Square Feet		221,884				221,884
A fund managed by Meritz Alternative Investment Management | Due from joint ventures | 220 East 42nd Street
General information on each joint venture
Ownership Interest		51.00%				51.00%
Economic Interest (as a percent)		51.00%				51.00%
Approximate Square Feet		1,135,000				1,135,000
Wells Fargo | Due from joint ventures | 85 Fifth Avenue
General information on each joint venture
Ownership Interest		36.27%				36.27%
Economic Interest (as a percent)		36.27%				36.27%
Approximate Square Feet		12,946				12,946
National Pension Service of Korea / Hines Interest LP / International Investor | One Madison Avenue
General information on each joint venture
Ownership percentage deconsolidated									50.50%
Investment fair value adjustment | $									$ 187,500,000
Investment in joint venture aggregate maximum ownership percentage								25.00%
National Pension Service of Korea / Hines Interest LP / International Investor | Due from joint ventures | One Madison Avenue
General information on each joint venture
Ownership Interest		25.50%				25.50%
Economic Interest (as a percent)		25.50%				25.50%
Approximate Square Feet		1,048,700				1,048,700
Korean Institutional Investor / Israeli Institutional Investor | 450 Park Avenue | Third-Party
General information on each joint venture
Ownership Interest		49.90%				49.90%
Investment in joint venture, partners' ownership percentage		25.00%				25.00%
Korean Institutional Investor / Israeli Institutional Investor | Due from joint ventures | 450 Park Avenue
General information on each joint venture
Ownership Interest		50.10%				50.10%
Economic Interest (as a percent)		25.10%				25.10%
Approximate Square Feet		337,000				337,000
Investment in joint venture, ownership percentage		25.10%				25.10%
RXR Realty led investment group | Due from joint ventures | 5 Times Square (4)
General information on each joint venture
Ownership Interest		31.55%				31.55%
Economic Interest (as a percent)		31.55%				31.55%
Approximate Square Feet		1,131,735				1,131,735
U.S. Affiliate of Mori Trust Co., Ltd | Due from joint ventures | 245 Park Avenue
General information on each joint venture
Ownership Interest		50.10%				50.10%
Economic Interest (as a percent)		50.10%				50.10%
Approximate Square Feet		1,782,793				1,782,793
Private Investor | Due from joint ventures | Madison Ave, 625
General information on each joint venture
Ownership Interest			90.43%

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Investments in Unconsolidated Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures Sold (Details) - USD ($)	1 Months Ended					12 Months Ended
	Feb. 28, 2023	Sep. 30, 2021	Jun. 30, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
(Loss) Gain on Sale						$ (13,368,000)	$ (131,000)	$ (32,757,000)
Employee-related liabilities						$ 2,000,000	$ 0	$ 1,400,000
400 East 57th Street
Schedule of Equity Method Investments [Line Items]
Asset impairment loss				$ 5,700,000
Due from joint ventures | 21 East 66th Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	32.28%
Gross Asset Valuation	$ 40,600,000
(Loss) Gain on Sale	$ (12,700,000)
Due from joint ventures | 121 Greene Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	50.00%
Gross Asset Valuation	$ 14,000,000.0
(Loss) Gain on Sale	$ (300,000)
Due from joint ventures | Stonehenge Portfolio
Schedule of Equity Method Investments [Line Items]
Gross Asset Valuation		$ 1,000,000.0
(Loss) Gain on Sale		$ 0
Due from joint ventures | 400 East 57th Street | BlackRock, Inc And Stonehenge Partners
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold			41.00%
Gross Asset Valuation			$ 133,500,000
(Loss) Gain on Sale			$ (1,000,000.0)
Due from joint ventures | 605 West 42nd Street - Sky | The Moinian Group
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold					20.00%
Gross Asset Valuation					$ 858,100,000
(Loss) Gain on Sale					$ 8,900,000
Due from joint ventures | 55 West 46th Street - Tower 46 | Prudential Real Estate Investors
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold					25.00%
Gross Asset Valuation					$ 275,000,000.0
(Loss) Gain on Sale					$ (15,200,000)

XML

Investments in Unconsolidated Joint Ventures - Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) extension	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt		$ 1,387,386,000	$ 3,165,814,000
Total floating rate debt		110,000,000	70,148,000
Repayments of mortgages		25,826,000	292,364,000	$ 375,044,000
245 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt		0	1,712,750,000
Due from joint ventures
Debt Instrument [Line Items]
Total fixed rate debt		12,000,559,000	10,855,657,000
Total floating rate debt		2,902,780,000	1,629,980,000
Total joint venture mortgages and other loans payable		14,903,339,000	12,485,637,000
Deferred financing costs, net		(104,062,000)	(136,683,000)
Total joint venture mortgages and other loans payable, net		14,799,277,000	12,348,954,000
Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		6,053,808,000	5,478,032,000
Total floating rate debt		1,298,467,000	694,887,000
Total joint venture mortgages and other loans payable		7,352,275,000	6,172,919,000
Deferred financing costs, net		(54,865,000)	(66,910,000)
Total joint venture mortgages and other loans payable, net		$ 7,297,410,000	6,106,009,000
Due from joint ventures | 717 Fifth Avenue | Wharton Properties / Private Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		10.92%
Due from joint ventures | 650 Fifth Avenue | Wharton Properties
Debt Instrument [Line Items]
Economic Interest (as a percent)		50.00%
Interest rate, floating rate debt (as a percent)		2.25%
Total floating rate debt		$ 210,000,000	210,000,000
Maturity date of the loan, extended		2 months
Due from joint ventures | 650 Fifth Avenue | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 105,000,000	105,000,000
Due from joint ventures | 220 East 42nd Street | A fund managed by Meritz Alternative Investment Management
Debt Instrument [Line Items]
Economic Interest (as a percent)		51.00%
Interest rate, fixed rate debt (as a percent)		5.86%
Total fixed rate debt		$ 505,412,000	510,000,000
Due from joint ventures | 220 East 42nd Street | A fund managed by Meritz Alternative Investment Management | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 257,760,000	260,100,000
Due from joint ventures | 5 Times Square (4) | RXR Realty led investment group
Debt Instrument [Line Items]
Economic Interest (as a percent)		31.55%
Interest rate, fixed rate debt (as a percent)		7.13%
Interest rate, floating rate debt (as a percent)		5.65%
Total fixed rate debt		$ 477,783,000	400,000,000
Total floating rate debt		610,010,000	495,924,000
Due from joint ventures | 5 Times Square (4) | RXR Realty led investment group | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		150,740,000	126,200,000
Total floating rate debt		$ 192,458,000	156,464,000
Due from joint ventures | 10 East 53rd Street | Canadian Pension Plan Investment Board
Debt Instrument [Line Items]
Economic Interest (as a percent)		55.00%
Interest rate, fixed rate debt (as a percent)		5.45%
Total fixed rate debt		$ 220,000,000	220,000,000
Due from joint ventures | 10 East 53rd Street | Canadian Pension Plan Investment Board | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 121,000,000	121,000,000
Due from joint ventures | 1515 Broadway | Allianz Real Estate of America
Debt Instrument [Line Items]
Economic Interest (as a percent)		56.87%
Interest rate, fixed rate debt (as a percent)		3.93%
Total fixed rate debt		$ 762,002,000	782,321,000
Due from joint ventures | 1515 Broadway | Allianz Real Estate of America | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		433,344,000	444,898,000
Due from joint ventures | 115 Spring Street (2) | RXR Realty led investment group
Debt Instrument [Line Items]
Total floating rate debt		0	65,550,000
Due from joint ventures | 115 Spring Street (2) | RXR Realty led investment group | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 0	33,431,000
Due from joint ventures | 115 Spring Street (2) | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		51.00%
Interest rate, fixed rate debt (as a percent)		5.50%
Total fixed rate debt		$ 65,550,000	0
Due from joint ventures | 115 Spring Street (2) | Private Investors | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 33,431,000	0
Due from joint ventures | 450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		25.10%
Interest rate, fixed rate debt (as a percent)		6.10%
Total fixed rate debt		$ 271,394,000	267,000,000
Due from joint ventures | 450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 68,120,000	67,017,000
Due from joint ventures | 11 Madison Avenue | PGIM Real Estate
Debt Instrument [Line Items]
Economic Interest (as a percent)		60.00%
Interest rate, fixed rate debt (as a percent)		3.84%
Total fixed rate debt		$ 1,400,000,000	1,400,000,000
Due from joint ventures | 11 Madison Avenue | PGIM Real Estate | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 840,000,000	840,000,000
Due from joint ventures | One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		25.50%
Interest rate, fixed rate debt (as a percent)		3.59%
Total fixed rate debt		$ 733,103,000	467,008,000
Due from joint ventures | One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 186,941,000	119,087,000
Due from joint ventures | 800 Third Avenue | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		60.52%
Interest rate, fixed rate debt (as a percent)		3.37%
Total fixed rate debt		$ 177,000,000	177,000,000
Due from joint ventures | 800 Third Avenue | Private Investors | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 107,120,000	107,120,000
Due from joint ventures | 919 Third Avenue | New York State Teacher's Retirement System
Debt Instrument [Line Items]
Economic Interest (as a percent)		51.00%
Interest rate, fixed rate debt (as a percent)		6.11%
Total fixed rate debt		$ 500,000,000	500,000,000
Due from joint ventures | 919 Third Avenue | New York State Teacher's Retirement System | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 255,000,000	255,000,000
Due from joint ventures | 625 Madison Avenue | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		90.43%
Debt instrument, face amount		$ 168,900,000
Debt Instrument, Increase, Accrued Interest		$ 31,100,000
Due from joint ventures | 625 Madison Avenue | New York State Teacher's Retirement System
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.11%
Total fixed rate debt		$ 199,987,000	0
Due from joint ventures | 625 Madison Avenue | New York State Teacher's Retirement System | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 180,848,000	0
Due from joint ventures | 245 Park Avenue | New York State Teacher's Retirement System
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.30%
Total fixed rate debt		$ 1,768,000,000	0
Due from joint ventures | 245 Park Avenue | New York State Teacher's Retirement System | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 885,768,000	0
Due from joint ventures | Worldwide Plaza (4) | RXR Realty / New York REIT
Debt Instrument [Line Items]
Economic Interest (as a percent)		24.95%
Interest rate, fixed rate debt (as a percent)		3.98%
Total fixed rate debt		$ 1,200,000,000	1,200,000,000
Due from joint ventures | Worldwide Plaza (4) | RXR Realty / New York REIT | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 299,400,000	299,400,000
Due from joint ventures | One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP
Debt Instrument [Line Items]
Economic Interest (as a percent)		71.01%
Interest rate, fixed rate debt (as a percent)		2.95%
Total fixed rate debt		$ 3,000,000,000	3,000,000,000
Due from joint ventures | One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 2,130,300,000	2,130,300,000
Due from joint ventures | 280 Park Avenue | RXR Realty led investment group
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.03%
Due from joint ventures | 280 Park Avenue | Vornado Realty Trust
Debt Instrument [Line Items]
Economic Interest (as a percent)		50.00%
Total fixed rate debt		$ 0	1,200,000,000
Total floating rate debt		1,200,000,000	0
Due from joint ventures | 280 Park Avenue | Vornado Realty Trust | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		0	600,000,000
Total floating rate debt		600,000,000	0
Due from joint ventures | 21 East 66th Street | RXR Realty led investment group
Debt Instrument [Line Items]
Total floating rate debt		0	586,000
Due from joint ventures | 21 East 66th Street | RXR Realty led investment group | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		0	188,000
Due from joint ventures | 21 East 66th Street | Vornado Realty Trust
Debt Instrument [Line Items]
Total fixed rate debt		0	12,000,000
Due from joint ventures | 21 East 66th Street | Vornado Realty Trust | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 0	3,874,000
Due from joint ventures | 11 West 34th Street (2) | Private Investor / Wharton Properties
Debt Instrument [Line Items]
Economic Interest (as a percent)		30.00%
Interest rate, floating rate debt (as a percent)		1.45%
Total floating rate debt		$ 23,000,000	23,000,000
Due from joint ventures | 11 West 34th Street (2) | Private Investor / Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 6,900,000	6,900,000
Due from joint ventures | 2 Herald Square | Subsequent Event
Debt Instrument [Line Items]
Repayments of mortgages	$ 7,000,000
Due from joint ventures | 2 Herald Square | Israeli Institutional Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		51.00%
Interest rate, floating rate debt (as a percent)		2.06%
Total floating rate debt		$ 182,500,000	182,500,000
Due from joint ventures | 2 Herald Square | Israeli Institutional Investor | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 93,075,000	93,075,000
Due from joint ventures | 100 Park Avenue | Prudential Real Estate Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		49.90%
Interest rate, floating rate debt (as a percent)		2.36%
Total floating rate debt		$ 360,000,000	360,000,000
Due from joint ventures | 100 Park Avenue | Prudential Real Estate Investors | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 179,640,000	179,640,000
Due from joint ventures | 15 Beekman | A fund managed by Meritz Alternative Investment Management
Debt Instrument [Line Items]
Economic Interest (as a percent)		20.00%
Interest rate, floating rate debt (as a percent)		1.61%
Total floating rate debt		$ 124,137,000	86,738,000
Due from joint ventures | 15 Beekman | A fund managed by Meritz Alternative Investment Management | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 24,827,000	17,348,000
Due from joint ventures | 1552 Broadway | Wharton Properties
Debt Instrument [Line Items]
Economic Interest (as a percent)		50.00%
Interest rate, floating rate debt (as a percent)		2.75%
Total floating rate debt		$ 193,133,000	193,132,000
Due from joint ventures | 1552 Broadway | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		96,567,000	96,566,000
Due from joint ventures | 121 Greene Street | Wharton Properties
Debt Instrument [Line Items]
Total floating rate debt		0	12,550,000
Due from joint ventures | 121 Greene Street | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 0	6,275,000
Due from joint ventures | Mortgage loan | 717 Fifth Avenue | Wharton Properties / Private Investor
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.02%
Total fixed rate debt		$ 655,328,000	655,328,000
Due from joint ventures | Mortgage loan | 717 Fifth Avenue | Wharton Properties / Private Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 71,536,000	71,536,000
Due from joint ventures | Mortgage loan | 650 Fifth Avenue | Wharton Properties
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.45%
Total fixed rate debt		$ 65,000,000	65,000,000
Due from joint ventures | Mortgage loan | 650 Fifth Avenue | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		32,500,000	$ 32,500,000
Due from joint ventures | Construction Loans | One Madison Avenue
Debt Instrument [Line Items]
Maximum facility capacity		$ 1,250,000,000
Term		5 years
Number of extension options | extension		1
Period of extension option		1 year
Due from joint ventures | Construction Loans | 15 Beekman
Debt Instrument [Line Items]
Maximum facility capacity		$ 125,000,000

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Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Commercial real estate property, net		$ 5,020,789	$ 7,159,245
Cash and restricted cash		221,823	203,273	$ 251,417
Tenant and other receivables, related party receivables, and deferred rents receivable		33,270	34,497
Other assets		413,670	546,945
Total assets	[1]	9,531,181	12,355,794
Liabilities and equity
Mortgages and other loans payable, net		1,491,319	3,227,563
Lease liabilities		827,692	895,100
Other liabilities		471,401	236,211
Equity		3,855,925	4,646,922	4,778,253	$ 4,935,795
Total liabilities and equity/capital		9,531,181	12,355,794
Company's investments in unconsolidated joint ventures		2,983,313	3,190,137
Investments difference between carrying amount and underlying equity		545,600
Combined statements of income for the unconsolidated joint ventures
Total revenues		913,710	919,454	861,310
Real estate taxes		143,757	138,228	152,835
Operating lease rent		27,292	26,943	26,554
Interest expense, net of interest income		137,114	89,473	70,891
Amortization of deferred financing costs		7,837	7,817	11,424
Depreciation and amortization		247,810	216,167	216,969
Total expenses		990,296	838,752	764,661
Loss on early extinguishment of debt		(870)	0	(1,551)
Net (loss) income		(599,337)	(76,303)	480,632
Company's equity in net (loss) income from unconsolidated joint ventures		(76,509)	(57,958)	(55,402)
Due from joint ventures
Assets
Commercial real estate property, net		18,467,340	15,989,642
Cash and restricted cash		656,038	709,299
Tenant and other receivables, related party receivables, and deferred rents receivable		673,532	601,552
Other assets		2,584,765	2,551,426
Total assets		22,381,675	19,851,919
Liabilities and equity
Mortgages and other loans payable, net		14,799,277	12,348,954
Deferred revenue		1,108,180	1,077,901
Lease liabilities		990,276	1,000,356
Other liabilities		447,705	456,537
Equity		5,036,237	4,968,171
Total liabilities and equity/capital		22,381,675	19,851,919
Company's investments in unconsolidated joint ventures		2,983,313
Combined statements of income for the unconsolidated joint ventures
Total revenues		1,525,044	1,339,364	1,228,364
Payments made for services		253,630	240,002	203,332
Real estate taxes		287,462	252,806	225,104
Operating lease rent		29,048	26,152	22,576
Interest expense, net of interest income		574,032	431,865	342,910
Amortization of deferred financing costs		28,157	27,754	31,423
Depreciation and amortization		516,466	465,100	484,130
Total expenses		1,688,795	1,443,679	1,309,475
Loss on early extinguishment of debt		0	(467)	(2,017)
Net (loss) income		(163,751)	(104,782)	(83,128)
Company's equity in net (loss) income from unconsolidated joint ventures		$ (76,509)	$ (57,958)	$ (55,402)

[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

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Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 399,224	$ 407,188
Less: accumulated amortization	(287,761)	(286,031)
Deferred costs, net	$ 111,463	$ 121,157

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Mortgages and Other Loans Payable - Schedule of Mortgages and Other Loans Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,387,386	$ 3,165,814
Total floating rate debt	110,000	70,148
Total mortgages and other loans payable	1,497,386	3,235,962
Deferred financing costs, net of amortization	(6,067)	(8,399)
Total mortgages and other loans payable, net	1,491,319	3,227,563
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	277,238	283,064
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	370,000	370,000
7 Dey/185 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	190,148	200,000
Total floating rate debt	0	10,148
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	100,000	100,000
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	450,000	450,000
719 Seventh Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	50,000
Total floating rate debt	50,000	0
245 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	1,712,750
690 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 60,000	$ 60,000
Weighted Average | 420 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.99%
Weighted Average | 100 Church Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.89%
Weighted Average | 7 Dey/185 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.65%
Weighted Average | Landmark Square
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.90%
Weighted Average | 485 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.25%
Weighted Average | 719 Seventh Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.31%
Weighted Average | 690 Madison Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	0.50%

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Mortgages and Other Loans Payable - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2023	Dec. 31, 2022
Mortgages and Other Loans Payable
Book value of collateral	$ 1.9	$ 3.8

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Corporate Indebtedness - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) extension	Dec. 31, 2022 USD ($)
Corporate Indebtedness
Outstanding under line of credit facility	$ 554,752,000	$ 443,217,000
2012 Credit Facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity	1,250,000,000
Letters of credit	2,000,000
Ability to borrow under line of credit facility	$ 688,000,000
Revolving credit facility
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Outstanding under line of credit facility	$ 560,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee (as a percent)	0.125%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Line of Credit | Term loan
Corporate Indebtedness
Long-term debt	$ 1,200,000,000	1,200,000,000
Line of Credit | 2012 Credit Facility
Corporate Indebtedness
Long-term debt	554,800,000	$ 443,200,000
Term loan | Term Loan A, Maturity March 31, 2023
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,050,000,000.00
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.60%
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.80%
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.60%
Term loan | Term Loan B, Maturity November 21, 2024
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 200,000,000
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.65%
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.85%
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.65%
Revolving credit facility | Line of Credit | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.10%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,250,000,000
Number of extensions | extension	2
Term of extension	6 months
Maximum borrowing capacity, optional expansion	$ 4,500,000,000
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.40%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.725%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.40%

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Corporate Indebtedness - 2022 Term Loan (Details) - Line of Credit - Term Loan 2022 - Line of Credit	1 Months Ended	12 Months Ended
	Oct. 31, 2022 USD ($) extensionOption	Dec. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount		$ 425,000,000	$ 425,000,000
Number of extension options | extensionOption	1
Period of extension option	6 months
Debt instrument, face amount, higher borrowing capacity option	$ 500,000,000
Debt instrument, face amount, increase limit			$ 25,000,000
Long-term debt		$ 398,200,000
SOFR
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		0.10%
SOFR | Minimum
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.00%
SOFR | Maximum
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.80%

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Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt disclosures by scheduled maturity date
Accreted Balance	$ 1,244,881	$ 1,641,552
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	100,000	100,000
Deferred financing costs, net	(205)	(308)
Senior notes, net of deferred finance costs	99,795	99,692
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	$ 100,000	$ 100,000
Coupon Rate (as a percent)	4.27%
Initial Term (in Years)	10 years

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Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2005 USD ($)	Dec. 31, 2023 USD ($) quarter
Principal Repayments and Joint Venture Debt
2024		$ 587,238
2025		470,000
2026		190,148
2027		2,160,000
2028		0
Thereafter		100,000
Repayments of principal		$ 3,507,386
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000
Trust Preferred Securities | SOFR
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		0.26%
Interest payment deferment, number of consecutive quarters | quarter		8
Due from joint ventures
Principal Repayments and Joint Venture Debt
2024		$ 1,822,978
2025		1,670,861
2026		542,968
2027		1,185,168
2028		0
Thereafter		2,130,300
Repayments of principal		7,352,275
Due from joint ventures | Mortgages and other loans payable
Scheduled Amortization
2024		4,488
2025		0
2026		0
2027		0
2028		0
Thereafter		0
Future Amortization of Debt		4,488
Principal Repayments and Joint Venture Debt
2024		382,750
2025		370,000
2026		190,148
2027		550,000
2028		0
Thereafter		0
Repayments of principal		1,492,898
Due from joint ventures | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
2024		0
2025		0
2026		0
2027		560,000
2028		0
Thereafter		0
Repayments of principal		560,000
Due from joint ventures | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
2024		200,000
2025		0
2026		0
2027		1,050,000
2028		0
Thereafter		0
Repayments of principal		1,250,000
Due from joint ventures | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
2024		0
2025		0
2026		0
2027		0
2028		0
Thereafter		100,000
Repayments of principal		100,000
Due from joint ventures | Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
2024		0
2025		100,000
2026		0
2027		0
2028		0
Thereafter		0
Repayments of principal		$ 100,000

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Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest expense
Interest expense before capitalized interest	$ 228,840	$ 166,493	$ 145,197
Interest on financing leases	4,446	4,555	5,448
Interest capitalized	(95,980)	(82,444)	(78,365)
Amortization of discount on assumed debt	2,842	1,855	0
Interest income	(3,034)	(986)	(1,389)
Interest expense, net	$ 137,114	$ 89,473	$ 70,891

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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Profit participation from related party		$ 77,410	$ 77,793	$ 86,483
Operating lease rent		27,292	26,943	26,554
Total rental revenue		683,335	671,500	678,176
Related party receivables		12,168	27,352
One Vanderbilt Avenue
Related Party Transaction [Line Items]
Operating lease rent		3,000	3,000
SUMMIT One Vanderbilt
Related Party Transaction [Line Items]
Operating lease rent		38,900	33,000
Total rental revenue		26,200	22,800
Due from joint ventures
Related Party Transaction [Line Items]
Operating lease rent		29,048	26,152	22,576
Related party receivables		10,603	26,812
Other
Related Party Transaction [Line Items]
Related party receivables		$ 1,565	540
Related party
Related Party Transaction [Line Items]
Profit participation from related party			1,400	1,700
SUMMIT Operator expenses			$ 8,600	$ 14,000
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue
Related Party Transaction [Line Items]
Amount of related party transaction	$ 1,400
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Minimum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors	1.27%
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Maximum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors	0.85%
Andrew Mathias, President | One Vanderbilt Avenue
Related Party Transaction [Line Items]
Amount of related party transaction	$ 1,000
Andrew Mathias, President | One Vanderbilt Avenue | Minimum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors	1.92%
Andrew Mathias, President | One Vanderbilt Avenue | Maximum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors	1.28%
Holiday And Mathias | One Vanderbilt Avenue | Related party
Related Party Transaction [Line Items]
Stabilization of property, within three years after stabilization, percent			50.00%
Stabilization period		3 years
Stabilization of property, three years or more after stabilization, percent		100.00%
Stabilization of property, anniversary period		7 years
Holiday | Related party | One Vanderbilt Avenue | Property Interest Liquidation
Related Party Transaction [Line Items]
Amount of related party transaction			$ 17,900
Mathias | Related party | One Vanderbilt Avenue | Property Interest Liquidation
Related Party Transaction [Line Items]
Amount of related party transaction			$ 11,900

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions | $	$ (2,777)	$ (4,699)	$ (6,631)
Acquisition of subsidiary interest from noncontrolling interest | $		(29,817)
Net loss | $	(37,465)	(5,794)	25,457
Accumulated other comprehensive income allocation | $	$ (1,960)	5,827	1,042
Series B Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Preferred units, issued (in shares)	0
SL Green Operating Partnership
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $	$ 269,993	344,252
Distributions | $	(14,779)	(16,272)
Issuance of common units | $	25,365	22,855
Acquisition of subsidiary interest from noncontrolling interest | $	(18,589)	(40,901)
Net loss | $	(37,465)	(5,794)
Accumulated other comprehensive income allocation | $	(1,960)	5,827
Fair value adjustment | $	15,486	(39,974)
Balance at end of period | $	$ 238,051	$ 269,993	344,252
SL Green Operating Partnership
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	3,949,448	3,670,343
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions | $	$ (2,777)	$ (4,699)	(6,631)
Acquisition of subsidiary interest from noncontrolling interest | $		(29,817)
Accumulated other comprehensive income allocation | $	$ (1,960)	$ 5,827	$ 1,042
SL Green Operating Partnership | Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	5.75%	5.39%
SL Green Operating Partnership | Series A Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	5.00%
Preferred Units, shares authorized (in shares)	109,161
Number of preferred units issued (in shares)	109,161
Preferred units, shares outstanding (in shares)	109,161
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 50.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
Number of company common stock issued on conversion of Series B preferred units	6.71348
SL Green Operating Partnership | Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	7.00%
Preferred Units, shares authorized (in shares)	60
Number of preferred units issued (in shares)	60
Preferred units, shares outstanding (in shares)	60
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 70.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 29.12
SL Green Operating Partnership | Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	3.50%
Preferred Units, shares authorized (in shares)	700,000
Number of preferred units issued (in shares)	563,954
Preferred units, shares outstanding (in shares)	341,677
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 134.67
SL Green Operating Partnership | Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4.00%
Preferred Units, shares authorized (in shares)	500,000
Number of preferred units issued (in shares)	378,634
Preferred units, shares outstanding (in shares)	372,634
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series R Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	3.50%
Preferred Units, shares authorized (in shares)	400,000
Number of preferred units issued (in shares)	400,000
Preferred units, shares outstanding (in shares)	400,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 154.89
SL Green Operating Partnership | Series S Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4.00%
Preferred Units, shares authorized (in shares)	1,077,280
Number of preferred units issued (in shares)	1,077,280
Preferred units, shares outstanding (in shares)	1,077,280
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series V Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	5.00%
Preferred Units, shares authorized (in shares)	40,000
Number of preferred units issued (in shares)	40,000
Preferred units, shares outstanding (in shares)	40,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.2500
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series W
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Preferred Units, shares authorized (in shares)	1
Number of preferred units issued (in shares)	1
Preferred units, shares outstanding (in shares)	1
Preferred stock, dividend, multiplier per common unit distribution	1,350
SL Green Operating Partnership | Series B Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Convertible preferred stock, shares issued upon conversion (in shares)	1

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Rollforward Analysis of Preferred Unit Activity
Redemption and conversion of common units		$ (29,817)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Redemption and conversion of common units		(29,817)
SL Green Operating Partnership | Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	$ 177,943	196,075
Issuance of preferred units	0	0
Redemption and conversion of common units	(11,700)	(17,967)
Dividends paid on preferred units	(6,271)	(6,198)
Accrued dividends on preferred units	6,529	6,033
Balance at end of period	$ 166,501	$ 177,943

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Stockholders' Equity of the Company - Additional Information (Details) - $ / shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Authorized capital stock (in shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000
Preferred stock, par (in dollars per share)	$ 0.01
Excess shares issued (shares)	0
Excess shares outstanding (in shares)	0
Common Stock
Class of Stock [Line Items]
Shares, outstanding (in shares)	64,726,000	64,380,000	64,105,000	66,474,000
Common Stock | SL Green Operating Partnership
Class of Stock [Line Items]
Shares, outstanding (in shares)	64,726,253
Excess shares issued (shares)	64,726,253

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Stockholders' Equity of the Company - Stock Repurchase Program (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) increase $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Class of Stock [Line Items]
Number of shares purchased (in shares) | shares	0	1,971,092	4,474,649
Average price paid per share (in dollars per share) | $ / shares	$ 0	$ 76.69	$ 75.44
2016 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount | $				$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 1,000,000,000
Number of increases to share repurchase program | increase	5
Stock repurchase program, authorized amount, total | $	$ 3,500,000,000
Number of shares purchased (in shares) | shares	36,107,719	36,107,719	34,136,627

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Stockholders' Equity of the Company - At-the-Market Equity Offering Program and Perpetual Preferred Stock (Details) - Series I Preferred Stock - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2012	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000	9,200,000
Dividend rate preferred units (as a percent)		6.50%
Perpetual Preferred stock, liquidation preference (in dollars per share)		$ 25.00	$ 25.00
Perpetual Preferred stock, annual dividends per share (in dollars per share)		$ 1.625
Contributions of net proceeds from sale of preferred stock	$ 221.9

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Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 28, 2021
Stockholders' Equity
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)				3,500,000
Issuance of common stock (in shares)	17,180	10,839	10,387
Dividend reinvestments/stock purchases under the DRSPP	$ 525	$ 525	$ 738

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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic Earnings:
(Loss) income attributable to SL Green common stockholders		$ (579,509)	$ (93,024)	$ 434,804
Less: distributed earnings allocated to participating securities		(2,655)	(2,219)	(2,398)
Less: undistributed earnings allocated to participating securities		0	0	(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)		(582,164)	(95,243)	432,214
Effect of Dilutive Securities:
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares		0	0	2,039
Add back: undistributed earnings allocated to participating securities		0	0	192
Add back: effect of dilutive securities (redemption of units to common shares)		(37,465)	(5,794)	25,457
Net (loss) income attributable to SL Green common stockholders, diluted		$ (619,629)	$ (101,037)	$ 459,902
Basic Shares:
Weighted average common stock outstanding (in shares)		63,809,000	63,917,000	65,740,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (in shares)		4,163,000	4,012,000	3,987,000
Stock-based compensation plans (in shares)		0	0	705,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares)		0	0	337,000
Diluted weighted average common stock outstanding (in shares)		67,972,000	67,929,000	70,769,000
Common stock shares excluded from the diluted shares outstanding (in shares)		1,273,417	1,682,236	948,017

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Partners' Capital of the Operating Partnership - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Series I Preferred Units
Stockholders' Equity
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000
Common Stock
Stockholders' Equity
Units, outstanding (in units)	64,726,000	64,380,000	64,105,000	66,474,000
SL Green Operating Partnership
Stockholders' Equity
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	3,949,448	3,670,343
SL Green Operating Partnership | Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	5.75%	5.39%
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Common units redemption, period of restriction	1 year
Conversion of stock, shares issued (in shares)	1
SL Green Operating Partnership | Common Stock
Stockholders' Equity
Units, outstanding (in units)	64,726,253
Excess shares issued (shares)	64,726,253

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Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator
Less: distributed earnings allocated to participating securities	$ (2,655)	$ (2,219)	$ (2,398)
Less: undistributed earnings allocated to participating securities	0	0	(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	(582,164)	(95,243)	432,214
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	$ 0	$ 0	$ 2,039
Denominator
Diluted weighted average common stock outstanding (in shares)	67,972,000	67,929,000	70,769,000
Common stock shares excluded from the diluted shares outstanding (in shares)	1,273,417	1,682,236	948,017
SL Green Operating Partnership
Numerator
Net (loss) income attributable to SLGOP common unitholders	$ (616,974)	$ (98,818)	$ 460,261
Less: distributed earnings allocated to participating securities	(2,655)	(2,219)	(2,398)
Less: undistributed earnings allocated to participating securities	0	0	(192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	(619,629)	(101,037)	457,671
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	0	0	2,590
(Loss) income attributable to SLGOP common unitholders	$ (619,629)	$ (101,037)	$ 460,261
Denominator
Basic weighted average common units outstanding (in shares)	67,972,000	67,929,000	69,667,000
Stock-based compensation plans (in shares)	0	0	765,000
Contingently issuable units (in shares)	0	0	337,000
Diluted weighted average common stock outstanding (in shares)	67,972,000	67,929,000	70,769,000

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Share-based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) unit / shares fungibleUnit shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options	$ 1,400,000	$ 1,800,000	$ 2,100,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of option (in years)	5 years
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares	1.0
Expected life of option (in years)	10 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of commencement of option vesting, from date of grant (in years)	1 year
Granted (in shares) | shares	0	0	0
Remaining weighted average contractual life of the options outstanding (in years)	3 years
Remaining weighted average contractual life of the options exercisable (in years)	3 years
Total unrecognized compensation cost related to unvested stock awards	$ 0
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)	5 years
Options vesting period (in years)	1 year
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)	10 years
Options vesting period (in years)	5 years
Class O LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred unit distributions as a percentage of common unit distributions	10.00%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 7,766,055	$ 10,133,905	$ 8,497,054
Total unrecognized compensation cost related to unvested stock awards	$ 20,200,000
Annual award vesting rate, low end of range (as a percent)	15.00%
Annual award vesting rate, high end of range (as a percent)	35.00%
Fair value of restricted stock vested during the period	$ 10,200,000	9,700,000	11,300,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	2 years 3 months 18 days
Weighted average fair value of options granted during the period	$ 15,789,540	$ 16,804,931	$ 9,214,531
Awards granted (in shares) | shares	337,350	314,995	141,515
Awards outstanding (in shares) | shares	4,089,174	3,758,174	3,459,363	3,337,545
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	1 year 7 months 6 days
Weighted average fair value of options granted during the period	$ 38,100,000	$ 45,000,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock awards	27,100,000
Share-based compensation	$ 50,400,000	43,500,000	$ 41,900,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (shares) | shares	500,000
Duration of each offering period starting the first day of each calendar quarter (in months)	3 months
Shares of common stock available for issuance (shares)	85.00%
Shares of common stock issued (shares) | shares	224,159
Fourth Amended and Restated 2003 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum fungible units that may be granted (in shares) | fungibleUnit	32,210,000
Fungible units per share (in fungible units per share) | unit / shares	2.59
Shares that may be issued if equal to fungible units (shares) (less than) | shares	32,210,000
Number of fungible units available for grant | fungibleUnit	3,900,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares	0.84
Third Amendment and Restated 2005 Stock Option and Incentive Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0	$ 0	$ 0
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,700,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)	100.00%
Awards granted (in shares) | shares	39,302
Shares issued (in shares) | shares	27,739
Awards outstanding (in shares) | shares	230,295

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Share-based Compensation - Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock options
Options Outstanding
Balance at beginning of year (in shares)	313,480	394,089	761,686
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	(11,314)
Lapsed or cancelled (in shares)	(197,500)	(80,609)	(356,283)
Balance at end of period (in shares)	115,980	313,480	394,089
Options exercisable at end of period (in shares)	115,980	313,480	394,089
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 97.59	$ 100.56	$ 105.76
Exercised (in dollars per share)	0	0	72.30
Lapsed or cancelled (in dollars per share)	84.14	112.14	112.56
Balance at end of period (in dollars per share)	103.52	97.59	100.56
Options exercisable at end of period (in dollars per share)	$ 103.52	$ 97.59	$ 100.56
Restricted Stock Awards
Summary of restricted stock
Balance at beginning of year (in shares)	3,758,174	3,459,363	3,337,545
Granted (in shares)	337,350	314,995	141,515
Cancelled (in shares)	(6,350)	(16,184)	(19,697)
Balance at end of period (in shares)	4,089,174	3,758,174	3,459,363
Vested during the period (in shares)	147,915	118,255	122,759
Compensation expense recorded	$ 7,766,055	$ 10,133,905	$ 8,497,054

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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	$ 4,646,922	$ 4,778,253	$ 4,935,795
Ending balance	3,855,925	4,646,922	4,778,253
Deferred net gains (losses) from terminated hedges	(400)	(500)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	49,604	(46,758)	(67,247)
Other comprehensive (loss) income before reclassifications	22,670	100,346	(3,011)
Amounts reclassified from accumulated other comprehensive income (loss)	(54,797)	(3,984)	23,500
Ending balance	17,477	49,604	(46,758)
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	47,800	(25,881)	(57,415)
Other comprehensive (loss) income before reclassifications	17,269	78,300	14,908
Amounts reclassified from accumulated other comprehensive income (loss)	(39,717)	(4,619)	16,626
Ending balance	25,352	47,800	(25,881)
Net unrealized (loss) gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	(242)	1,117	1,021
Other comprehensive (loss) income before reclassifications	(1,549)	(1,359)	96
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Ending balance	(1,791)	(242)	1,117
Due from joint ventures
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	4,968,171
Ending balance	5,036,237	4,968,171
Due from joint ventures | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	2,046	(21,994)	(10,853)
Other comprehensive (loss) income before reclassifications	6,950	23,405	(18,015)
Amounts reclassified from accumulated other comprehensive income (loss)	(15,080)	635	6,874
Ending balance	$ (6,084)	$ 2,046	$ (21,994)

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Fair Value Measurements (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2023	Jul. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Fair Value of Financial Instruments
Marketable securities available-for-sale			$ 9,591	$ 11,240
Interest rate cap and swap agreements (included in Other assets)			33,456	57,660
Ownership percentage deconsolidated	50.10%	51.00%
Investment fair value adjustment	$ 17,000	$ 206,800	17,000
Debt and preferred equity investments			346,745	623,280
Variable Rate Debt
Fair Value of Financial Instruments
Estimated fair value of debt and preferred equity investments, low end of range			110,000
Estimated fair value of debt and preferred equity investments, high end of range			108,600
220 East 42nd Street
Fair Value of Financial Instruments
Ownership interest disposed	49.90%
Carrying Value
Fair Value of Financial Instruments
Fixed rate debt			3,237,386	5,015,814
Variable rate debt			270,000	520,148
Total debt			3,507,386	5,535,962
Fair Value
Fair Value of Financial Instruments
Total debt			3,453,125	5,304,360
Estimated fair value of debt and preferred equity investments, low end of range			300,000	600,000
Estimated fair value of debt and preferred equity investments, high end of range				600,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)			0	0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)			33,456	57,660
Level 3
Fair Value of Financial Instruments
Marketable securities available-for-sale			0	0
Interest rate cap and swap agreements (included in Other assets)			0	0
Level 3 | Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments			346,745	623,280
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt			3,184,338	4,784,691
Variable rate debt			268,787	519,669
Equity marketable securities | Level 1
Fair Value of Financial Instruments
Marketable securities available-for-sale			0	0
Mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities available-for-sale			9,591	11,240
Mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities available-for-sale			9,591	11,240
Accrued Interest Payable and Other
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)			17,108	10,142
Accrued Interest Payable and Other | Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)			0	0
Accrued Interest Payable and Other | Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)			17,108	10,142
Accrued Interest Payable and Other | Level 3
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)			$ 0	$ 0

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Financial Instruments: Derivatives and Hedging - Schedule of Notional and Fair Value of Derivative Financial Instruments and Foreign Currency Hedges (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments: Derivatives and Hedging
Fair Value	$ 33,456	$ 57,660
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Fair Value	16,348
Interest Rate Swaps/Caps | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Fair Value	43,034
Interest Rate Swap Expiring January 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	2.60%
Fair Value	$ 11
Interest Rate Swap Expiring in January 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	4.49%
Fair Value	$ 5
Interest Rate Swap Expiring in January 2024, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	4.411%
Fair Value	$ 5
Interest Rate Cap Expiring June 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.25%
Fair Value	$ 3,158
Interest Rate Cap Expiring June 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 505,412
Strike Rate	3.00%
Fair Value	$ 4,948
Interest Rate Cap Expiring in June 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.25%
Fair Value	$ (3,145)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	2.621%
Fair Value	$ 4,011
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	2.662%
Fair Value	$ 5,196
Interest Rate Swap Expiring in February 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	2.903%
Fair Value	$ 2,281
Interest Rate Swap Expiring in February 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	2.733%
Fair Value	$ 2,775
Interest Rate Swap Expiring in February 2027, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 50,000
Strike Rate	2.463%
Fair Value	$ 1,781
Interest Rate Swap Expiring in February 2027, 4
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	2.591%
Fair Value	$ 6,378
Interest Rate Swap Expiring in May 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000
Strike Rate	2.866%
Fair Value	$ 7,306
Interest Rate Swap Expiring in May 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	3.524%
Fair Value	$ 549
Interest Rate Swap Expiring in June 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.888%
Fair Value	$ (3,044)
Interest Rate Swap Expiring in November 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000
Strike Rate	4.487%
Fair Value	$ (10,273)
Interest Rate Swap Expiring in January 2028
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	3.756%
Fair Value	$ (646)
Interest Rate Cap Expiring February 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 220,000
Strike Rate	4.00%
Fair Value	$ 318
Interest Rate Cap Expiring May 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 484,069
Strike Rate	0.49%
Fair Value	$ 8,331
Interest Rate Cap Expiring May 2024, 2 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 484,069
Strike Rate	0.49%
Fair Value	$ 8,330
Interest Rate Cap Expiring August 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 272,000
Strike Rate	4.00%
Fair Value	$ 1,675
Interest Rate Cap Expiring September 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 477,783
Strike Rate	3.50%
Fair Value	$ 5,213
Interest Rate Cap Expiring November 2024 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 278,161
Strike Rate	4.00%
Fair Value	$ 948
Interest Rate Cap Expiring November 2024, 2 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 278,161
Strike Rate	4.00%
Fair Value	$ 948
Interest Rate Swap Expiring February 2026 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000
Strike Rate	3.608%
Fair Value	$ 1,819
Interest Rate Swap Expiring February 2026, 2 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000
Strike Rate	3.608%
Fair Value	$ 1,818
Interest Rate Swap Expiring February 2026, 3 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000
Strike Rate	1.555%
Fair Value	$ 8,686

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Financial Instruments: Derivatives and Hedging (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) derivative
Financial Instruments: Derivatives and Hedging
Fair value of derivatives in a net liability position	$ 17.5
Aggregate termination value	18.3
Interest Rate Cap
Financial Instruments: Derivatives and Hedging
Loss from changes in fair value	10.4	$ 1.7
Derivative, number of instruments sold | derivative			0
Interest Expense
Financial Instruments: Derivatives and Hedging
Loss from changes in fair value	0.2	$ 0.3	$ 0.0
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	(32.5)
Income Loss From Equity Method Investments
Financial Instruments: Derivatives and Hedging
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	$ (7.6)

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Financial Instruments: Derivatives and Hedging - Schedule of Effect of Derivative Financial Instruments on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income	$ 25,883	$ 107,945	$ (3,757)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	58,320	4,316	(25,184)
Due from joint ventures
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income	7,399	24,783	(19,400)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	16,050	(673)	(7,582)
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income	18,484	83,162	15,643
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ 42,270	$ 4,989	$ (17,602)

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Lease Income - Future Minimum Rents (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 496,311
2025	470,673
2026	426,247
2027	371,117
2028	316,789
Thereafter	1,339,758
Total payments to be received	$ 3,420,895

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Lease Income - Lease Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Fixed lease payments	$ 589,469	$ 583,107	$ 608,793
Variable lease payments	79,641	82,676	73,543
Total lease payments (1)	669,110	665,783	682,336
Amortization of acquired above and below-market leases	14,225	5,717	(4,160)
Total rental revenue	683,335	671,500	678,176
Sublease Income	196,500	222,100
Interest income	$ 4,444	$ 4,389	$ 4,422

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Lease Income - Sales Type Lease (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 3,180
2025	3,228
2026	3,276
2027	3,325
2028	3,375
Thereafter	196,794
Total minimum lease payments	213,178
Amount representing interest	(107,544)
Investment in sales-type leases	$ 105,634

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Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Multiemployer Plans [Line Items]
Plan contributions	$ 10,091		$ 9,145		$ 9,176
Employee contribution limit per calendar year	15.00%
Employer matching contribution, percent of match	100.00%		100.00%		100.00%
Percentage of eligible compensation matched by employer	4.00%		4.00%		4.00%
Matching contribution	$ 1,800		$ 1,500		$ 1,500
Pension Plan
Multiemployer Plans [Line Items]
Multiemployer plans, surcharge	No
Plan contributions	$ 2,111	$ 317,900	1,952	$ 305,700	1,994	$ 290,100
Multiemployer plans, contributions by employer, percent	5.00%
Health Plan
Multiemployer Plans [Line Items]
Plan contributions	$ 7,191	$ 1,900,000	6,386	$ 1,600,000	6,333	$ 1,500,000
Multiemployer plans, contributions by employer, percent	5.00%
Other plans
Multiemployer Plans [Line Items]
Plan contributions	$ 789		$ 807		$ 849

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Commitments and Contingencies (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Employment agreements with certain executives, minimum cash-based compensation for next fiscal year	$ 2,400,000
Financing leases
2024	3,180,000
2025	3,228,000
2026	3,276,000
2027	3,325,000
2028	3,375,000
Thereafter	196,794,000
Total minimum lease payments	213,178,000
Amount representing interest	(107,647,000)
Total lease liabilities excluding liabilities related to assets held for sale	105,531,000
Lease liabilities	105,531,000	$ 104,218,000
Non-cancellable operating leases
2024	53,455,000
2025	53,595,000
2026	53,734,000
2027	53,746,000
2028	54,211,000
Thereafter	1,208,864,000
Total minimum lease payments	1,477,605,000
Amount discounted using incremental borrowing rate	(649,913,000)
Total lease liabilities excluding liabilities related to assets held for sale	827,692,000
Lease liability - operating leases	827,692,000	895,100,000
Minimum sublease rentals to be received in the future	$ 3,420,895,000
711 Third Avenue
Other Commitments [Line Items]
Ownership interest	50.00%
Belmont
Other Commitments [Line Items]
Loss reserves	$ 3,300,000	3,100,000
Ticonderoga
Other Commitments [Line Items]
Loss reserves	$ 0	$ 0

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Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 29,637	$ 33,773	$ 30,270
Operating lease costs capitalized	(2,345)	(6,830)	(3,716)
Operating lease costs, net	27,292	26,943	26,554
Finance Lease, Costs [Abstract]
Interest on financing leases	4,446	4,555	5,448
Interest on financing leases capitalized	0	0	0
Interest on financing leases, net	4,446	4,555	5,448
Finance lease, right-of-use asset, amortization	0	0	660
Financing lease costs, net	$ 4,446	$ 4,555	$ 6,108
Operating lease, weighted average discount rate, percent	4.46%
Operating lease, weighted average remaining lease term	28 years

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Segment Information - Additional Information (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment information
Number of reportable segments (segment) | segment		3
Total revenues		$ 913,710	$ 919,454	$ 861,310
Net (loss) income		(599,337)	(76,303)	480,632
Total assets	[1]	9,531,181	12,355,794
Marketing, general and administrative		111,389	93,798	94,912
Operating Segments | Real Estate
Segment information
Total revenues		760,745	749,293	764,659
Net (loss) income		(612,884)	(128,615)	413,401
Total assets		8,716,738	11,265,789
Operating Segments | SUMMIT
Segment information
Total revenues		118,260	89,048	16,311
Net (loss) income		6,101	(3,668)	(1,008)
Total assets		464,799	461,629
Operating Segments | Debt and Preferred Equity
Segment information
Total revenues		34,705	81,113	80,340
Net (loss) income		7,446	55,980	$ 68,239
Total assets		$ 349,644	$ 628,376

[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $40.5 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.4 million and $4.4 million of accumulated depreciation, $676.9 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.9 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $306.5 million and $146.4 million of other liabilities included in other line items as of December 31, 2023 and December 31, 2022, respectively.

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Schedule III - Real Estate and Accumulated Depreciation (Details) $ in Thousands	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,497,386
Initial Cost
Land	1,210,669
Building & Improvements	4,495,893
Cost Capitalized Subsequent To Acquisition
Land	(117,996)
Building & Improvements	1,467,536
Gross Amount at Which Carried at Close of Period
Land	1,092,671
Building & Improvements (3)	5,963,429
Total	7,056,100	$ 9,198,799	$ 7,650,907	$ 7,355,079
Accumulated Depreciation	$ 2,035,311	$ 2,039,554	$ 1,896,199	$ 1,956,077
Approximate Square Feet | ft²	29,695,841
885 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost
Land	138,444
Building & Improvements	244,040
Cost Capitalized Subsequent To Acquisition
Land	(138,444)
Building & Improvements	(125,747)
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	118,293
Total	118,293
Accumulated Depreciation	11,040
Approximate Square Feet | ft²		218,796
420 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	277,238
Initial Cost
Land	0
Building & Improvements	333,499
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	242,766
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	576,265
Total	576,265
Accumulated Depreciation	227,258
711 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	19,844
Building & Improvements	115,769
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	72,821
Gross Amount at Which Carried at Close of Period
Land	19,844
Building & Improvements (3)	188,590
Total	208,434
Accumulated Depreciation	91,897
555 West 57th Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	18,846
Building & Improvements	140,946
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	12,521
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements (3)	153,467
Total	172,313
Accumulated Depreciation	98,508
461 Fifth Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	88,276
Cost Capitalized Subsequent To Acquisition
Land	28,873
Building & Improvements	12,680
Gross Amount at Which Carried at Close of Period
Land	28,873
Building & Improvements (3)	100,956
Total	129,829
Accumulated Depreciation	45,700
750 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	51,093
Building & Improvements	251,523
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	83,936
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements (3)	335,459
Total	386,552
Accumulated Depreciation	112,937
485 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	450,000
Initial Cost
Land	78,282
Building & Improvements	452,631
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	(15,086)
Gross Amount at Which Carried at Close of Period
Land	78,282
Building & Improvements (3)	437,545
Total	515,827
Accumulated Depreciation	201,735
810 Seventh Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	114,077
Building & Improvements	550,819
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,406
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements (3)	556,225
Total	670,302
Accumulated Depreciation	238,462
1185 Avenue of the Americas
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	791,106
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	139,416
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	930,522
Total	930,522
Accumulated Depreciation	404,093
1350 Avenue of the Americas
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	90,941
Building & Improvements	431,517
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	14,566
Gross Amount at Which Carried at Close of Period
Land	90,941
Building & Improvements (3)	446,083
Total	537,024
Accumulated Depreciation	196,985
1-6 Landmark Square
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	100,000
Initial Cost
Land	27,852
Building & Improvements	161,343
Cost Capitalized Subsequent To Acquisition
Land	(6,939)
Building & Improvements	(23,245)
Gross Amount at Which Carried at Close of Period
Land	20,913
Building & Improvements (3)	138,098
Total	159,011
Accumulated Depreciation	46,789
7 Landmark Square
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	1,721
Building & Improvements	8,417
Cost Capitalized Subsequent To Acquisition
Land	(1,338)
Building & Improvements	(6,240)
Gross Amount at Which Carried at Close of Period
Land	383
Building & Improvements (3)	2,177
Total	2,560
Accumulated Depreciation	695
100 Church Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	370,000
Initial Cost
Land	34,994
Building & Improvements	183,932
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	11,060
Gross Amount at Which Carried at Close of Period
Land	34,994
Building & Improvements (3)	194,992
Total	229,986
Accumulated Depreciation	78,305
125 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	120,900
Building & Improvements	270,598
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	23,312
Gross Amount at Which Carried at Close of Period
Land	120,900
Building & Improvements (3)	293,910
Total	414,810
Accumulated Depreciation	129,990
19 East 65th Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	8,603
Building & Improvements	2,074
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	3,345
Gross Amount at Which Carried at Close of Period
Land	8,603
Building & Improvements (3)	5,419
Total	14,022
Accumulated Depreciation	7
304 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	54,489
Building & Improvements	90,643
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	9,096
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements (3)	99,739
Total	154,228
Accumulated Depreciation	33,134
752-760 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	284,286
Building & Improvements	8,314
Cost Capitalized Subsequent To Acquisition
Land	(2,450)
Building & Improvements	187,847
Gross Amount at Which Carried at Close of Period
Land	281,836
Building & Improvements (3)	196,161
Total	477,997
Accumulated Depreciation	4,991
719 Seventh Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	50,000
Initial Cost
Land	41,180
Building & Improvements	46,232
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	(4,720)
Gross Amount at Which Carried at Close of Period
Land	41,180
Building & Improvements (3)	41,512
Total	82,692
Accumulated Depreciation	5,986
110 Greene Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	45,120
Building & Improvements	228,393
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	4,578
Gross Amount at Which Carried at Close of Period
Land	45,120
Building & Improvements (3)	232,971
Total	278,091
Accumulated Depreciation	57,067
185 Broadway
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	190,148
Initial Cost
Land	45,540
Building & Improvements	27,865
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	207,635
Gross Amount at Which Carried at Close of Period
Land	45,540
Building & Improvements (3)	235,500
Total	281,040
Accumulated Depreciation	12,200
690 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	60,000
Initial Cost
Land	13,820
Building & Improvements	51,732
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	28
Gross Amount at Which Carried at Close of Period
Land	13,820
Building & Improvements (3)	51,760
Total	65,580
Accumulated Depreciation	3,863
Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	20,635
Building & Improvements	16,224
Cost Capitalized Subsequent To Acquisition
Land	2,302
Building & Improvements	611,561
Gross Amount at Which Carried at Close of Period
Land	22,937
Building & Improvements (3)	627,785
Total	650,722
Accumulated Depreciation	$ 33,669
885 Third Avenue
Gross Amount at Which Carried at Close of Period
Approximate Square Feet | ft²		414,317
719 Seventh Avenue | 719 Seventh Avenue
Gross Amount at Which Carried at Close of Period
Interest in property (as a percent)	75.00%

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Schedule III - Real Estate and Accumulated Depreciation (Activity in Real Estate and Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in real estate
Balance at beginning of year	$ 9,198,799	$ 7,650,907	$ 7,355,079
Property acquisitions	0	1,900,042	124,103
Improvements	241,213	335,413	296,876
Retirements/disposals/deconsolidation	(2,383,912)	(687,563)	(125,151)
Balance at end of year	7,056,100	9,198,799	7,650,907
Aggregate cost of land, buildings and improvements before depreciation	4,400,000
Changes in accumulated depreciation
Balance at beginning of year	2,039,554	1,896,199	1,956,077
Depreciation for year	199,576	175,465	174,219
Retirements/disposals/deconsolidation	(203,819)	(32,110)	(234,097)
Balance at end of year	$ 2,035,311	$ 2,039,554	$ 1,896,199