10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

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

For the fiscal year ended December 31, 2013

OR

o 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 001-9106 (Brandywine Realty Trust)

000-24407 (Brandywine Operating Partnership, L.P.)

Brandywine Realty Trust

Brandywine Operating Partnership, L.P.

(Exact name of registrant as specified in its charter)

MARYLAND (Brandywine Realty Trust)	23-2413352
DELAWARE (Brandywine Operating Partnership L.P.)	23-2862640
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
555 East Lancaster Avenue
Radnor, Pennsylvania	19087
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (610) 325-5600

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

Title of each class	Name of each exchange on which registered
Common Shares of Beneficial Interest,	New York Stock Exchange
par value $0.01 per share
(Brandywine Realty Trust)
6.90% Series E Cumulative Redeemable Preferred	New York Stock Exchange
Shares of Beneficial Interest
par value $0.01 per share
(Brandywine Realty Trust)

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

Units of General Partnership Interest (Brandywine Operating Partnership, L.P.)

(Title of class)

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

Brandywine Realty Trust	Yes þ No o
Brandywine Operating Partnership, L.P.	Yes þ No o

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

Brandywine Realty Trust	Yes o No þ
Brandywine Operating Partnership, L.P.	Yes o No þ

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.

Brandywine Realty Trust	Yes þ No o
Brandywine Operating Partnership, L.P.	Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).

Brandywine Realty Trust	Yes þ No o
Brandywine Operating Partnership, L.P.	Yes þ No o

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Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

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

Brandywine Realty Trust:
Large accelerated filer þ Accelerated filer o Non-accelerated filer o Smaller reporting company o

Brandywine Operating Partnership, L.P.:
Large accelerated filer o Accelerated filer o Non-accelerated filer þ Smaller reporting company o

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

Brandywine Realty Trust	Yes o No þ
Brandywine Operating Partnership, L.P.	Yes o No þ

As of June 28, 2013, the aggregate market value of the Common Shares of Beneficial Interest held by non-affiliates of Brandywine Realty Trust was $2,091,192,105 based upon the last reported sale price of $13.52 per share on the New York Stock Exchange on June 28, 2013. An aggregate of 156,738,955 Common Shares of Beneficial Interest were outstanding as of February 20, 2014.

As of June 28, 2013, the aggregate market value of the 1,763,639 common units of limited partnership (“Units”) held by non-affiliates of Brandywine Operating Partnership, L.P. was $23,844,399 based upon the last reported sale price of $13.52 per share on the New York Stock Exchange on June 28, 2013 of the Common Shares of Beneficial Interest of Brandywine Realty Trust, the sole general partner of Brandywine Operating Partnership, L.P. (For this computation, the Registrant has excluded the market value of all Units beneficially owned by Brandywine Realty Trust.)

Documents Incorporated By Reference

Portions of the proxy statement for the 2014 Annual Meeting of Shareholders of Brandywine Realty Trust are incorporated by reference into Part III of this Form 10-K.

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EXPLANATORY NOTE

This report combines the annual reports on Form 10-K for the year ended December 31, 2013 of Brandywine Realty Trust (the “Parent Company”) and Brandywine Operating Partnership, L.P. (the “Operating Partnership”). The Parent Company is a Maryland real estate investment trust, or REIT, that owns its assets and conducts its operations through the Operating Partnership, a Delaware limited partnership, and subsidiaries of the Operating Partnership. The Parent Company, the Operating Partnership and their consolidated subsidiaries are collectively referred to in this report as the “Company”. In addition, terms such as “we”, “us”, or “our” used in this report may refer to the Company, the Parent Company, or the Operating Partnership.

The Parent Company is the sole general partner of the Operating Partnership and as of December 31, 2013, owned a 98.8% interest in the Operating Partnership. The remaining 1.2% interest consists of common units of limited partnership interest issued by the Operating Partnership to third parties in exchange for contributions of properties to the Operating Partnership. As the sole general partner of the Operating Partnership, the Parent Company has full and complete authority over the Operating Partnership’s day-to-day operations and management.

As general partner with control of the Operating Partnership, the Parent Company consolidates the Operating Partnership for financial reporting purposes, and the Parent Company does not have significant assets other than its investment in the Operating Partnership. Therefore, the assets and liabilities of the Parent Company and the Operating Partnership are the same on their respective financial statements. The separate discussions of the Parent Company and the Operating Partnership in this report should be read in conjunction with each other to understand the results of the Company's operations on a consolidated basis and how management operates the Company.

Management operates the Parent Company and the Operating Partnership as one enterprise. The management of the Parent Company consists of the same members as the management of the Operating Partnership. These members are officers of both the Parent Company and of the Operating Partnership.

The Company believes that combining the annual reports on Form 10-K of the Parent Company and the Operating Partnership into a single report will result in the following benefits:

• facilitate a better understanding by the investors of the Parent Company and the Operating Partnership by enabling them to view the business as a whole in the same manner as management views and operates the business;

• remove duplicative disclosures and provide a more straightforward presentation in light of the fact that a substantial portion of the disclosure applies to both the Parent Company and the Operating Partnership; and

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

There are few differences between the Parent Company and the Operating Partnership, which are reflected in the footnote disclosures in this report. The Company believes it is important to understand the differences between the Parent Company and the Operating Partnership in the context of how these entities operate as an interrelated consolidated company. The Parent Company is a REIT, whose only material asset is its ownership of the partnership interests of the Operating Partnership. As a result, the Parent Company does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public equity from time to time and guaranteeing the debt obligations of the Operating Partnership. The Operating Partnership holds substantially all the assets of the Company and directly or indirectly holds the ownership interests in the Company’s real estate ventures. The Operating Partnership conducts the operations of the Company’s business and is structured as a partnership with no publicly traded equity. Except for net proceeds from equity issuances by the Parent Company, which are contributed to the Operating Partnership in exchange for partnership units, the Operating Partnership generates the capital required by the Company’s business through the Operating Partnership’s operations, by the Operating Partnership’s direct or indirect incurrence of indebtedness or through the issuance of partnership units of the Operating Partnership or equity interests in subsidiaries of the Operating Partnership.

The equity and non-controlling interests in the Parent Company and the Operating Partnership’s equity are the main areas of difference between the consolidated financial statements of the Parent Company and the Operating Partnership. The common units of limited partnership interest in the Operating Partnership are accounted for as partners’ equity in the Operating Partnership’s financial statements while the common units of limited partnership interests held by parties other than the Parent Company are presented as non-controlling interests in the Parent Company’s financial statements. The differences between the Parent Company and the Operating Partnership’s equity relate to the differences in the equity issued at the Parent Company and Operating Partnership levels.

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

• Consolidated Financial Statements;

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• Parent Company’s and Operating Partnership’s Equity

This report also includes separate Item 9A. (Controls and Procedures) disclosures and separate Exhibit 31 and 32 certifications for each of the Parent Company and the Operating Partnership in order to establish that the Chief Executive Officer and the Chief Financial Officer of each entity have made the requisite certifications and that the Parent Company and Operating Partnership are compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. § 1350.

In order to highlight the differences between the Parent Company and the Operating Partnership, the separate sections in this report for the Parent Company and the Operating Partnership specifically refer to the Parent Company and the Operating Partnership. In the sections that combine disclosures of the Parent Company and the Operating Partnership, this report refers to such disclosures as those of the Company.

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TABLE OF CONTENTS

	Page
PART I
Item 1. Business	8
Item 1A. Risk Factors	16
Item 1B. Unresolved Staff Comments	26
Item 2. Properties	26
Item 3. Legal Proceedings	37
Item 4. Mine Safety Disclosures	37
PART II
Item 5. Market for Registrant’s Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities	38
Item 6. Selected Financial Data	41
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations	42
Item 7A. Quantitative and Qualitative Disclosures About Market Risk	70
Item 8. Financial Statements and Supplementary Data	70
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	70
Item 9A. Controls and Procedures	70
Item 9B. Other Information	72
PART III
Item 10. Directors, Executive Officers and Corporate Governance	73
Item 11. Executive Compensation	73
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters	73
Item 13. Certain Relationships and Related Transactions, and Director Independence	73
Item 14. Principal Accountant Fees and Services	73

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PART IV
Item 15. Exhibits and Financial Statement Schedules	74
SIGNATURES	83
Exhibit 3.1.29
Exhibit 10.16
Exhibit 12.1
Exhibit 12.2
Exhibit 21
Exhibit 23.1
Exhibit 23.2
Exhibit 31.1
Exhibit 31.2
Exhibit 31.3
Exhibit 31.4
Exhibit 32.1
Exhibit 32.2
Exhibit 32.3
Exhibit 32.4
Exhibit 99.1
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

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Filing Format

This combined Form 10-K is being filed separately by Brandywine Realty Trust (the “Parent Company”) and Brandywine Operating Partnership, L.P. (the “Operating Partnership”).

Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. This Annual Report on Form 10-K and other materials filed by us with the Securities and Exchange Commission (the "SEC") (as well as information included in oral or other written statements made by us) contain statements that are forward-looking, including statements relating to business and real estate development activities, acquisitions, dispositions, future capital expenditures, financing sources, governmental regulation (including environmental regulation) and competition. We intend such forward-looking statements to be covered by the safe-harbor provisions of the 1995 Act. The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “will,” “should” and similar expressions, as they relate to us, are intended to identify forward-looking statements. Although we believe that the expectations reflected in such forward-looking statements are based on reasonable assumptions, we can give no assurance that our expectations will be achieved. As forward-looking statements, these statements involve important risks, uncertainties and other factors that could cause actual results to differ materially from the expected results and, accordingly, such results may differ from those expressed in any forward-looking statements made by us or on our behalf. Factors that could cause actual results to differ materially from our expectations include, but are not limited to:

• the continuing impact of modest global economic growth, which is having and may continue to have a negative effect on the following, among other things:

• the fundamentals of our business, including overall market occupancy, demand for office space and rental rates;

• the financial condition of our tenants, many of which are financial, legal and other professional firms, our lenders, counterparties to our derivative financial instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties;

• the availability of financing on attractive terms or at all, which may adversely impact our future interest expense and our ability to pursue acquisition and development opportunities and refinance existing debt; and

• a decline in real estate asset valuations, which may limit our ability to dispose of assets at attractive prices or obtain or maintain debt financing secured by our properties or on an unsecured basis.

• changes in local real estate conditions (including changes in rental rates and the number of properties that compete with our properties);

• our failure to lease unoccupied space in accordance with our projections;

• our failure to re-lease occupied space upon expiration of leases;

• tenant defaults and the bankruptcy of major tenants;

• increases in interest rates;

• failure of interest rate hedging contracts to perform as expected and the effectiveness of such arrangements;

• failure of acquisitions to perform as expected;

• unanticipated costs associated with the acquisition, integration and operation of our acquisitions;

• unanticipated costs to complete, lease-up and operate our developments and redevelopments;

• unanticipated costs associated with land development, including building moratoriums and inability to obtain necessary zoning, land-use, building, occupancy and other required governmental approvals, construction cost increases or overruns and construction delays;

• impairment charges;

• increased costs for, or lack of availability of, adequate insurance, including for terrorist acts or environmental liabilities;

• actual or threatened terrorist attacks;

• the impact on workplace and tenant space demands driven by technology, employee culture and commuting patterns;

• demand for tenant services beyond those traditionally provided by landlords;

• liability and clean-up costs under environmental or other laws;

• failure or bankruptcy of real estate venture partners;

• inability of real estate venture partners to fund venture obligations;

• failure to manage effectively our growth into new product types within our real estate venture arrangements;

• failure of dispositions to close in a timely manner;

• failure of buyers of our properties to comply with terms of their financing agreements to us;

• earthquakes and other natural disasters;

• the unforeseen impact of climate change and compliance costs relating to laws and regulations governing climate change;

• risks associated with federal, state and local tax audits;

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• complex regulations relating to our status as a REIT and the adverse consequences of our failure to qualify as a REIT; and

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

Given these uncertainties, and the other risks identified in the “Risk Factors” section and elsewhere in this Annual Report on Form 10-K, we caution readers not to place undue reliance on forward-looking statements. We assume no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

PART I

Item 1. Business

Introduction

We are a self-administered and self-managed REIT that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office, mixed-use and industrial properties. As of December 31, 2013, we owned 204 properties that contain an aggregate of approximately 24.8 million net rentable square feet and consist of 176 office properties, 19 industrial facilities, five mixed-use properties, one development property, two redevelopment properties and one re-entitlement property (collectively, the “Properties”). In addition, as of December 31, 2013, we owned economic interests in 17 unconsolidated real estate ventures that that own properties that contain approximately 5.7 million net rentable square feet (collectively, the “Real Estate Ventures”). As of December 31, 2013, we also owned 432 acres of undeveloped land, and held options to purchase approximately 51 additional acres of undeveloped land. As of December 31, 2013, the total potential development that these land parcels could support under current zoning, entitlements or combination thereof, amounted to 6.8 million square feet. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord, and Carlsbad, California. In addition to managing properties that we own, as of December 31, 2013, we were managing approximately 7.9 million net rentable square feet of office and industrial properties for third parties and the Real Estate Ventures. Unless otherwise indicated, all references in this Form 10-K to square feet represent net rentable area. We do not have any foreign operations and our business is not seasonal. Our operations are not dependent on a single tenant or a few tenants and no single tenant accounted for more than 10% of our total 2013 revenue.

Organization

The Parent Company was organized and commenced its operations in 1986 as a Maryland REIT. The Parent Company owns its assets and conducts its operations through the Operating Partnership and subsidiaries of the Operating Partnership. The Operating Partnership was formed in 1996 as a Delaware limited partnership. The Parent Company controls the Operating Partnership as its sole general partner. As of December 31, 2013, the Parent Company owned a 98.8% interest in the Operating Partnership. The remaining 1.2% interest in the Operating Partnership consists of common units of limited partnership interest issued to the holders in exchange for contributions of properties to the Operating Partnership. Our structure as an “UPREIT” is designed, in part, to permit persons contributing properties to us to defer some or all of the tax liability they might otherwise incur in a sale of properties. Our executive offices are located at 555 East Lancaster Avenue, Suite 100, Radnor, Pennsylvania 19087 and our telephone number is (610) 325-5600. We have offices in Philadelphia, Pennsylvania; McLean, Virginia; Mount Laurel, New Jersey; Richmond, Virginia; Austin, Texas; and Carlsbad, California. We have an internet website at www.brandywinerealty.com. We are not incorporating by reference into this Annual Report on Form 10-K any material from our website. The reference to our website is an inactive textual reference to the uniform resource locator (URL) and is for your reference only.

2013 Transactions

Real Estate Acquisitions

On December 19, 2013, we increased our equity ownership interest in One and Two Commerce Square, two Class A trophy office properties in Philadelphia, Pennsylvania, from 25% to 99%. These two properties contain 1,896,142 of net rentable square feet of office space and were 83.7% and 89.6% occupied, respectively, as of December 31, 2013. We acquired the additional ownership interests from an unaffiliated third party for cash proceeds of $73.1 million. We used available corporate funds for the cash portion of the acquisition price.

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In connection with the acquisition of One Commerce Square, we assumed a $125.1 million existing non-recourse first mortgage with a fixed interest rate of 5.67% and a maturity date of January 6, 2016. In connection with the acquisition of Two Commerce Square, we assumed a $112.0 million existing non-recourse first mortgage with a fixed interest rate of 3.96% and a maturity date of April 5, 2023.

On December 19, 2013, we acquired, from an unaffiliated third party, a two building office property totaling 192,396 of net rentable square feet known as Four Points Centre, together with 22.3 acres of nearby land parcels in Austin, Texas for an aggregate $47.3 million. This office property was 99.2% occupied as of December 31, 2013. We funded the acquisition price with available corporate funds.

On November 19, 2013, we acquired, from an unaffiliated third party, the 0.8 acre land parcel underlying our Cira Centre office tower in Philadelphia, Pennsylvania for $24.6 million. We had developed and owned Cira Centre on land subject to a long-term ground lease, and our acquisition of the land resulted in termination of the ground lease. We funded the acquisition with available corporate funds and capitalized $1.4 million of acquisition related costs as part of our basis in the operating land.

On April 25, 2013, we acquired the 1.8 acre land parcel underlying our Three Logan Square office tower in Philadelphia, Pennsylvania for $20.8 million. We acquired Three Logan Square in 2010 on land subject to a long-term ground lease, and, as part of our 2010 acquisition, held an option to acquire the land. Our 2013 acquisition of the land resulted in termination of the ground lease. We funded the acquisition with available corporate funds and capitalized $0.1 million of acquisition related costs as part of basis in the operating land.

For additional information on our 2013 acquisitions, please see Item 2 of this Form 10-K below.

Real Estate Dispositions

On December 19, 2013, we sold a 50,000 net rentable square feet office property located in King of Prussia, Pennsylvania known as 875 First Avenue, for a sales price of $3.8 million resulting in a $0.1 million gain on sale after closing and other transaction related costs.

On October 17, 2013, we sold a 39,330 net rentable square feet office property located in West Chester, Pennsylvania known as 1336 Enterprise Drive, for a sales price of $2.6 million resulting in a $0.2 million gain on sale after closing and other transaction related costs.

On August 5, 2013, the Company sold an eight-acre parcel of land located in Richmond, Virginia known as Dabney Land East, for a sales price of $0.5 million resulting in a $0.1 million loss on sale after closing and other transaction related costs. The land parcel was undeveloped as of the date of sale.

On June 28, 2013, the Company sold 16870 West Bernardo Drive, a 68,708 net rentable square feet office property located in San Diego, California, for a sales price of $18.0 million resulting in a $0.9 million loss on sale after closing and other transaction related costs.

On June 28, 2013, the Company sold 100 Arrandale Boulevard, a 34,931 net rentable square feet office property located in Exton, Pennsylvania, for a sales price of $3.5 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 19, 2013, the Company sold 1700 Paoli Pike, a 28,000 net rentable square feet office property located in Malvern, Pennsylvania known as 100 Applebrook, for a sales price of $2.7 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 14, 2013, the Company sold Pacific View Plaza, a 51,695 net rentable square feet office property located in Carlsbad, California, for a sales price of $10.3 million resulting in a $0.5 million loss on sale after closing and other transaction related costs.

On February 25, 2013, the Company sold a portfolio of eight office properties, containing 800,546 square feet in Lawrenceville, New Jersey for an aggregate sales price of $121.0 million resulting in a $5.3 million gain on sale after closing and other transaction related costs.

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Austin Venture Formation

On October 16, 2013, we contributed a portfolio of seven office properties containing an aggregate of 1,398,826 net rentable square feet and located in Austin, Texas (the "Austin Properties") to a new unconsolidated real estate venture (the "Austin Venture") that we formed with G&I VII Austin Office LLC (“DRA”), an investment vehicle unaffiliated with us and advised by DRA Advisors LLC. The Austin Properties and related assets represent our entire remaining property portfolio within the Austin, Texas region, with the exception of Four Points Centre which was acquired in December 2013. Based on arm's-length negotiation, we and DRA agreed to a $330.0 million aggregate gross valuation of the properties we contributed into the Austin Venture subject to our obligation to fund the first $5.2 million of post-closing capital expenditures of the Austin Venture, of which $0.8 million had been funded by us through December 31, 2013.

We and DRA each own a 50% interest in the Austin Venture, subject to our receipt of a "promoted interest" that entitles us to receive (in addition to receipts on account of our 50% interest) up to an additional 10% of net proceeds from capital events, such as property sales, if and after DRA and we have received an agreed upon internal rate of return on our respective capital contributions to the Austin Venture.

Upon its formation, the Austin Venture obtained third party non-recourse debt financing of approximately $230.6 million secured by mortgages on the Austin Properties and used proceeds of this financing together with $49.7 million of cash contributed to the Austin Venture by DRA (less $1.9 million of closing costs and $6.9 million of closing prorations and lender holdbacks) to fund a $271.5 million distribution to us. We have agreed to fund the first $5.2 million of post-closing capital expenditures on behalf of the Austin Venture, resulting in net proceeds to us of $266.3 million after funding our capital expenditure obligation. As part of the transaction, our subsidiary management company executed an agreement with the Austin Venture to provide property management and leasing services to the Austin Venture in exchange for a market-based fee.

4040 Wilson Venture Formation

On July 31, 2013, we formed 4040 Wilson LLC Venture ("4040 Wilson"), as a joint venture between us and Ashton Park Associates LLC (“Ashton Park”), an unaffiliated third party. We and Ashton Park each owns a 50% interest in 4040 Wilson. 4040 Wilson expects to construct a 426,900 square foot office building representing the final phase of the eight building, mixed-use, Liberty Center complex developed by the parent company of Ashton Park in the Ballston submarket of Arlington, Virginia. 4040 Wilson expects to develop the office building on a 1.3 acre land parcel contributed by Ashton Park to 4040 Wilson at an agreed upon valuation of $36.0 million. The total estimated project costs are $194.1 million, which we expect will be financed through approximately $72.0 million of partner capital contributions (consisting of $36.0 million in cash from the Company and land with a value of $36.0 million from Ashton Park) and approximately $125.1 million of debt financing through a construction lender that has not yet been determined. We expect groundbreaking to commence upon achievement of certain of pre-leasing levels, at which point 4040 Wilson would expect to obtain debt financing for a portion of the project costs.

In our joint venture agreement with Ashton Park, we agreed to guarantee 100% of any lender mandated recourse. As of December 31, 2013, we had no outstanding guarantees related to 4040 Wilson.

Two and Six Tower Bridge Exchange Transaction

On June 19, 2013, we acquired an unaffiliated third party's ownership interest in Six Tower Bridge, an office property containing 116,174 net rentable square feet in Conshohocken, Pennsylvania. Prior to the June 2013 acquisition, we had a 63% ownership interest in the real estate venture that held title to this property. We acquired full ownership of Six Tower Bridge by exchanging our entire 37% ownership interest in a separate real estate venture that held title to Two Tower Bridge, an office property also in Conshohocken, for the remaining 35% ownership interest in Six Tower Bridge. Please see Note 4, "Investment in Unconsolidated Real Estate Ventures," to our consolidated financial statements for further discussion.

evo at Cira Centre South Venture (formerly the Grove Venture)

On January 25, 2013, we formed the HSRE-Campus Crest IX Real Estate Venture ("evo at Cira"), a joint venture among the Company and two unaffiliated third parties: Campus Crest Properties, LLC ("Campus Crest") and HSRE-Campus Crest IXA, LLC ("HSRE"). evo at Cira has commenced construction of a 33-story, 850-bed student housing tower located in the University City submarket of Philadelphia, Pennsylvania. The project is targeted for completion during the third quarter of 2014. We and Campus Crest each own a 30% interest in the evo at Cira and HSRE owns a 40% interest. evo at Cira is developing the project on a one-acre land parcel held under a long-term ground lease with the University of Pennsylvania, as ground lessor. We contributed to evo at Cira our tenancy rights under the long-term ground lease, together with associated development rights, at an agreed-upon value of $8.5 million. The total estimated project costs are $158.5 million, which are being financed through partner capital contributions totaling $60.7 million, and through $97.8 million of secured debt construction financing provided by PNC Bank,

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Capital One, and First Niagara Bank. We and Campus Crest have each provided, in addition to customary non-recourse carve-out guarantees, a completion and cost overrun guaranty, as well as a payment guaranty, on the construction financing (with the share of the payment guaranty for each of us and Campus Crest being approximately $24.7 million). As of December 31, 2013, we have funded 100% of our anticipated equity contributions. Construction has already commenced, with a targeted project completion in 2014.

The Parc at Plymouth Meeting Venture

Our 50%-owned unconsolidated real estate venture with Toll Brothers, Inc., a residential home builder, owns a 20-acre parcel of land located in Plymouth Meeting, Pennsylvania, which we contributed to the venture upon its formation in 2012 at a negotiated valuation of $15.5 million. This venture, known as “TB-BDN Plymouth Apartments, L.P.,” commenced construction of a 398 unit apartment complex in 2013 and we expect this development to be completed in the fourth quarter of 2015. We expect the project will cost approximately $77.0 million, of which $25.0 million had been funded as of December 31, 2013 through capital contributions to the venture consisting of $15.5 million funded by us through our land contribution and $15.5 million funded by Toll Brothers in cash and net of a $3.0 million excess capital distribution made to each partner in December 2013. We expect to fund a substantial portion of the remaining costs through a $56.0 million secured construction loan. The TB-BDN Plymouth Venture obtained this construction loan in December 2013. In addition to providing the lender a guaranty of 50% of costs overruns on the construction, we have provided the lender a payment guaranty on the loan covering $3.2 million.

BDN Beacon Venture Termination

On March 26, 2013, we sold our entire 20% ownership interest in an unconsolidated real estate venture that had been known as BDN Beacon Venture LLC (the "Beacon Venture"). The carrying amount of our investment in the Beacon Venture was $17.0 million at the sale date, with our share of the sales proceeds effectively matching the carrying amount.

Developments

As of December 31, 2013, we owned 432 acres of undeveloped land, and held options to purchase approximately 51 additional acres of undeveloped land.

We are a party to a development agreement and related ground leases with the University of Pennsylvania covering two adjacent parcels of land. As described above under "evo at Cira Centre South Venture (formerly the Grove Venture)", on January 25, 2013, we contributed our development and ground lease rights in one of the land parcels to the evo at Cira, which has commenced construction of a student housing tower.

As to the other land parcel, we have the right, on terms and conditions in the development agreement and applicable ground lease, to commence development of such other parcel by December 31, 2015. On October 31, 2013, we determined to proceed with development of the Cira Walnut Tower ("Cira Walnut"), which we currently contemplate as a 47-story office and residential tower at 30^th and Walnut Streets in Philadelphia. We currently expect Cira Walnut to be ready for initial occupancy during the second quarter of 2016 and to include approximately 575,000 square feet of office space, 245,000 square feet of residential space consisting of 260 market rate finished and unfinished rental apartment units, and 10,000 square feet of retail space, with an additional floor containing a full range of amenities.

As of December 31, 2013, we have pre-leased an aggregate of 61% of the office square feet of Cira Walnut.  The anchor tenant for approximately 253,000 square feet of this office space under a 16 year lease is FMC Corporation, a diversified chemical company serving agricultural, consumer and industrial markets globally.  In addition, we have pre-leased 100,000 square feet of office space to the University of Pennsylvania under a 20-year lease.  Cira Walnut will be known as The FMC Tower at Cira Centre South.

We currently anticipate that the office component of the project will cost approximately $236.0 million with the residential and retail components costing approximately $105.0 million for a total project cost of $341.0 million. We intend to fund these development costs through a combination of existing cash balances, capital raised through one or more joint venture formations, proceeds from additional asset sales and equity and debt financing including third party sources. Our current expectation is to either joint venture or pre-sell the residential component of the FMC Tower at Cira Centre South. We have executed a non-binding letter of intent with a residential development and operating company that contemplates either outcome.

Our ground lease with the University of Pennsylvania has a term through July 2097, with a variable rent that would provide the University with a percentage of the cash flow or proceeds of specified capital events subject to receipt of a priority return on eligible investments.

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We are currently redeveloping an office property known as 660 West Germantown Pike. This property contains 154,392 net rentable square feet and is located in Plymouth Meeting, Pennsylvania. We acquired this property in 2012 for $9.1 million and we expect to complete its redevelopment in the first quarter of 2014. We expect the total redevelopment costs to be $27.9 million (including the initial acquisition cost), of which $26.7 million had been funded as of December 31, 2013. We expect to fund the balance of the costs with available corporate funds. This property was 80.3% leased at December 31, 2013.

We are currently developing a retail and restaurant complex that will contain 17,884 net rentable square feet complex and will be located on Radnor Chester Road, in Radnor, Pennsylvania. We acquired this property in April 2013 and expect to complete the development in the first quarter of 2014. We expect the total development costs to be $7.4 million (including the land acquisition cost), of which $6.0 million had been funded as of December 31, 2013. We expect to fund the balance of the costs with available corporate funds. This property was 90.7% pre-leased to various tenants at December 31, 2013.

Business Objective and Strategies for Growth

Our business objective is to deploy capital effectively to maximize our return on investment and thereby maximize our total return to shareholders. To accomplish this objective we seek to:

• concentrate on urban town centers and central business districts in selected regions, and be the best of class owner and developer in those markets;

• maximize cash flow through leasing strategies designed to capture rental growth as rental rates increase and as leases are renewed;

• attain a high tenant retention rate by providing a full array of property management and maintenance services and tenant service programs responsive to the varying needs of our diverse tenant base;

• form joint venture opportunities with high-quality partners having attractive real estate holdings or significant financial resources;

• utilize our reputation as a full-service real estate development and management organization to identify acquisition and development opportunities that will expand our business and create long-term value; and

• increase the economic diversification of our tenant base while maximizing economies of scale.

We also consider the following to be important objectives:

• to acquire and develop high-quality office and industrial properties at attractive yields in markets that we expect will experience economic growth and where we can achieve operating efficiencies;

• to monetize or deploy our land inventory for development of high-quality office and industrial properties, or rezone from office/industrial to residential, retail and hotel to align with market and demand shifts as appropriate; and

• to capitalize on our redevelopment expertise to selectively develop, redevelop and reposition properties in desirable locations that other organizations may not have the resources to pursue.

We expect to concentrate our real estate activities in markets where we believe that:

• current and projected market rents and absorption statistics justify construction activity;

• we can maximize market penetration by accumulating a critical mass of properties and thereby enhance operating efficiencies;

• barriers to entry (such as zoning restrictions, utility availability, infrastructure limitations, development moratoriums and limited developable land) will create supply constraints on office and industrial space; and

• there is potential for economic growth, particularly job growth and industry diversification.

Operating Strategy

We currently expect to continue to operate in markets where we have a concentration advantage due to economies of scale. We believe that where possible, it is best to operate with a strong base of properties in order to benefit from the personnel allocation and the market strength associated with managing multiple properties in the same market. We also intend to selectively dispose of properties and redeploy capital if we determine a property cannot meet our long term earnings growth expectations. We believe that recycling capital is an important aspect of maintaining the overall quality of our portfolio.

Our broader strategy remains focused on continuing to enhance liquidity and strengthen our balance sheet through capital retention, debt reduction, targeted sales activity and management of our existing and prospective liabilities.

In the long term, we believe that we are well positioned in our current markets and have the expertise to take advantage of both development and acquisition opportunities, as warranted by market and economic conditions, in new markets that have healthy

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long-term fundamentals and strong growth projections. This capability, combined with what we believe is a conservative financial structure, should allow us to achieve disciplined growth. These abilities are integral to our strategy of having a diverse portfolio of assets, which will meet the needs of our tenants.

We use experienced on site construction superintendents, operating under the supervision of project managers and senior management, to control the construction process and mitigate the various risks associated with real estate development.

In order to fund developments, redevelopments and acquisitions, as well as refurbish and improve existing properties, we must use excess cash from operations after satisfying our dividend and other requirements. The availability of funds for new investments and maintenance of existing properties depends in large measure on capital markets and liquidity factors over which we can exert little control.

Policies With Respect To Certain Activities

The following is a discussion of our investment, financing and other policies. These policies have been determined by our Board of Trustees and our Board of Trustees may revise these policies without a vote of shareholders.

Investments in Real Estate or Interests in Real Estate

We may develop, purchase or lease income-producing properties for long-term investment, expand and improve the properties presently owned or other properties purchased, or sell such properties, in whole or in part, as circumstances warrant. Although there is no limitation on the types of development activities that we may undertake, we expect that our development activities will meet current market demand and will generally be on a build-to-suit basis for particular tenants where a significant portion of the building is pre-leased before construction begins. We continue to participate with other entities in property ownership through existing joint ventures or other types of co-ownership. Our equity investments may be subject to existing or future mortgage financing and other indebtedness that will have priority over our equity investments.

Securities of or Interests in Entities Primarily Engaged in Real Estate Activities and Other Issuers

Subject to the percentage of ownership limitations and gross income tests necessary for REIT qualification, we may invest in securities of other REITs, other entities engaged in real estate activities or securities of other issuers. We may enter into joint ventures or partnerships for the purpose of obtaining an equity interest in a particular property. We do not currently intend to invest in the securities of other issuers except in connection with joint ventures or acquisitions of indirect interests in properties.

Investments in Real Estate Mortgages

While our current portfolio consists of, and our business objectives emphasize, equity investments in commercial real estate, we may, at the discretion of management or our Board of Trustees, invest in other types of equity real estate investments, mortgages and other real estate interests. We do not presently intend to invest to a significant extent in mortgages or deeds of trust, but may invest in participating mortgages if we conclude that we may benefit from the cash flow or any appreciation in the value of the property securing a mortgage. From time to time, we provide seller financing to buyers of our properties. We do this when the buyer requires additional funds for the purchase and provision of seller financing will be beneficial to us and the buyer compared to a mortgage loan from a third party lender.

Dispositions

Our disposition of properties is based upon management’s periodic review of our portfolio and the determination by management or our Board of Trustees that a disposition would be in our best interests. We intend to use selective dispositions to fund our capital and refinancing needs.

Financing Policies

A primary objective of our financing policy has been to manage our financial position to allow us to raise capital from a variety of sources at competitive rates. Our mortgages, credit facilities and unsecured debt securities contain restrictions on our ability to incur indebtedness. Our charter documents do not limit the indebtedness that we may incur. Our financing strategy is to maintain a strong and flexible financial position by limiting our debt to a prudent level and minimizing our variable interest rate exposure. We intend to finance future growth and future maturing debt with the most advantageous source of capital then available to us. These sources may include selling additional common or preferred equity and debt securities through public offerings or private placements, utilizing availability under our credit facilities or incurring additional indebtedness through secured or unsecured borrowings. To qualify as a REIT, we must distribute to our shareholders each year at least ninety percent of our net taxable income, excluding any net capital gain. This distribution requirement limits our ability to fund future capital needs, including for acquisitions

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and developments, from income from operations. Therefore, we expect to continue to rely on third party sources of capital to fund future capital needs.

Guarantees

As of December 31, 2013, we have provide guarantees on behalf of certain of the real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures we have provided and expect to continue to provide cost overrun and completion guarantees, with rights of contribution among partners in the venture, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements.

Working Capital Reserves

We maintain working capital reserves and access to borrowings in amounts that our management determines to be adequate to meet our normal contingencies.

Policies with Respect to Other Activities

We expect to issue additional common and preferred equity in the future and may authorize our Operating Partnership to issue additional common and preferred units of limited partnership interest, including to persons who contribute their interests in properties to us in exchange for such units. We have not engaged in trading, underwriting or agency distribution or sale of securities of unaffiliated issuers and we do not intend to do so. We intend to make investments consistent with our qualification as a REIT, unless because of circumstances or changes in the Internal Revenue Code of 1986, as amended (or the Treasury Regulations), our Board of Trustees determines that it is no longer in our best interests to qualify as a REIT. We may make loans to third parties, including to joint ventures in which we participate and to buyers of our real estate. We intend to make investments in such a way that we will not be treated as an investment company under the Investment Company Act of 1940.

Management Activities

We provide third-party real estate management services primarily through wholly-owned subsidiaries of the Operating Partnership (collectively, the “Management Companies”). As of December 31, 2013, the Management Companies were managing properties containing an aggregate of approximately 32.7 million net rentable square feet, of which approximately 24.8 million net rentable square feet related to properties owned by us and approximately 7.9 million net rentable square feet related to properties owned by third parties and unconsolidated Real Estate Ventures.

Geographic Segments

During the year ended December 31, 2013, we were managing our portfolio within seven segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (“CBD”), (3) Metropolitan Washington D.C., (4) New Jersey/Delaware, (5) Richmond, Virginia, (6) Austin, Texas and (7) California. The Pennsylvania Suburbs segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. The Metropolitan Washington, D.C. segment includes properties in Northern Virginia and southern Maryland. The New Jersey/Delaware segment includes properties in Burlington and Camden counties in New Jersey and New Castle county in the state of Delaware. The Richmond, Virginia segment includes properties primarily in Albemarle, Chesterfield, Goochland and Henrico counties and one property in Durham, North Carolina. The Austin, Texas segment includes properties in Austin. On October 16, 2013 seven properties within the Austin portfolio were contributed to a newly formed real estate venture. After contributing the properties, the Company wholly owns one property in Austin, Texas. The California segment includes properties in Oakland, Concord, and Carlsbad. Our corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions.

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Competition

The real estate business is highly competitive. Our Properties compete for tenants with similar properties primarily on the basis of location, total occupancy costs (including base rent and operating expenses), services provided, and the design and condition of the improvements. We also face competition when attempting to acquire or develop real estate, including competition from domestic and foreign financial institutions, other REITs, life insurance companies, pension funds, partnerships and individual investors. Additionally, our ability to compete depends upon trends in the economies of our markets, investment alternatives, financial condition and operating results of current and prospective tenants, availability and cost of capital, construction and renovation costs, land availability, our ability to obtain necessary construction approvals, taxes, governmental regulations, legislation and population trends.

Insurance

We maintain commercial general liability and “all risk” property insurance on our properties. We intend to obtain similar coverage for properties we acquire in the future. There are types of losses, generally of a catastrophic nature, such as losses from war, terrorism, environmental issues, floods, hurricanes and earthquakes that are subject to limitations in certain areas or which may be uninsurable risks. We exercise our discretion in determining amounts, coverage limits and deductibility provisions of insurance, with a view to maintaining appropriate insurance on our investments at a reasonable cost and on suitable terms. If we suffer a substantial loss, our insurance coverage may not be sufficient to pay the full current market value or current replacement cost of our lost investment. Inflation, changes in building codes and ordinances, environmental considerations and other factors also might make it impractical to use insurance proceeds to fully replace or restore a property after it has been damaged or destroyed.

Employees

As of December 31, 2013, we had 406 full-time employees, including 20 union employees.

Government Regulations Relating to the Environment

Many laws and governmental regulations relating to the environment apply to us and changes in these laws and regulations, or their interpretation by agencies and the courts, occur frequently and may adversely affect us.

Existing conditions at some of our Properties. Independent environmental consultants have conducted Phase I or similar environmental site assessments on our Properties. We generally obtain these assessments prior to the acquisition of a property and may later update them as required for subsequent financing of the property or as requested by a tenant. Site assessments are generally performed to ASTM standards then existing for Phase I site assessments, and typically include a historical review, a public records review, a visual inspection of the surveyed site, and the issuance of a written report. These assessments do not generally include any soil samplings or subsurface investigations. Depending on the age of the property, the Phase I may have included an assessment of asbestos-containing materials. For properties where asbestos-containing materials were identified or suspected, an operations and maintenance plan was generally prepared and implemented. See Note 2 to our consolidated financial statements for our evaluation in accordance with the accounting standard governing asset retirement obligations.

Historical operations at or near some of our Properties, including the operation of underground storage tanks, may have caused soil or groundwater contamination. We are not aware of any such condition, liability or concern by any other means that would give rise to material, uninsured environmental liability. However, the assessments may have failed to reveal all environmental conditions, liabilities or compliance concerns; there may be material environmental conditions, liabilities or compliance concerns that a review failed to detect or which arose at a property after the review was completed; future laws, ordinances or regulations may impose material additional environmental liability; and current environmental conditions at our Properties may be affected in the future by tenants, third parties or the condition of land or operations near our Properties, such as the presence of underground storage tanks. We cannot be certain that costs of future environmental compliance will not affect our ability to make distributions to our shareholders.

Use of hazardous materials by some of our tenants. Some of our tenants handle hazardous substances and wastes on our Properties as part of their routine operations. Environmental laws and regulations may subject these tenants, and potentially us, to liability resulting from such activities. We generally require our tenants, in their leases, to comply with these environmental laws and regulations and to indemnify us for any related liabilities. These tenants are primarily involved in the life sciences and the light industrial and warehouse businesses. We are not aware of any material noncompliance, liability or claim relating to hazardous or toxic substances or petroleum products in connection with any of our Properties, and we do not believe that on-going activities by our tenants will have a material adverse effect on our operations.

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Costs related to government regulation and private litigation over environmental matters. Under environmental laws and regulations, we may be liable for the costs of removal, remediation or disposal of hazardous or toxic substances present or released on our Properties. These laws could impose liability without regard to whether we are responsible for, or knew of, the presence or release of the hazardous materials. Government investigations and remediation actions may entail substantial costs and the presence or release of hazardous substances on a property could result in governmental cleanup actions or personal injury or similar claims by private plaintiffs.

Potential environmental liabilities may exceed our environmental insurance coverage limits. We carry what we believe to be sufficient environmental insurance to cover potential liability for soil and groundwater contamination, mold impact, and the presence of asbestos-containing materials at the affected sites identified in our environmental site assessments. Our insurance policies are subject to conditions, qualifications and limitations. Therefore, we cannot provide any assurance that our insurance coverage will be sufficient to cover all liabilities for losses.

Potential environmental liabilities may adversely impact our ability to use or sell assets. The presence of contamination or the failure to remediate contamination may impair our ability to sell or lease real estate or to borrow using the real estate as collateral.

Code of Conduct

We maintain a Code of Business Conduct and Ethics applicable to our Board of Trustees and all of our officers and employees, including our principal executive officer, principal financial officer, principal accounting officer, controller and persons performing similar functions. A copy of our Code of Business Conduct and Ethics is available on our website, www.brandywinerealty.com. In addition to being accessible through our website, copies of our Code of Business Conduct and Ethics can be obtained, free of charge, upon written request to Investor Relations, 555 East Lancaster Avenue, Suite 100, Radnor, PA 19087. Any amendments to or waivers of our Code of Business Conduct and Ethics that apply to our principal executive officer, principal financial officer, principal accounting officer, controller and persons performing similar functions and that relate to any matter enumerated in Item 406(b) of Regulation S-K promulgated by the SEC will be disclosed on our website.

Corporate Governance Principles and Board Committee Charters

Our Corporate Governance Principles and the charters of the Executive Committee, Audit Committee, Compensation Committee and Corporate Governance Committee of the Board of Trustees of Brandywine Realty Trust and additional information regarding our corporate governance are available on our website, www.brandywinerealty.com. In addition to being accessible through our website, copies of our Corporate Governance Principles and charters of our Board Committees can be obtained, free of charge, upon written request to Investor Relations, 555 Lancaster Avenue, Suite 100, Radnor, PA 19087.

Availability of SEC Reports

We file annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and other information with the SEC. Members of the public may read and copy materials that we file with the SEC at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. Members of the public may also obtain information on the Public Reference Room by calling the SEC at 1-800-732-0330. The SEC also maintains an Internet web site that contains reports, proxy and information statements and other information regarding issuers, including us, that file electronically with the SEC. The address of that site is http://www.sec.gov. Our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and other information filed by us with the SEC are available, without charge, on our Internet web site, http://www.brandywinerealty.com as soon as reasonably practicable after they are filed electronically with the SEC. Copies are also available, free of charge, upon written request to Investor Relations, Brandywine Realty Trust, 555 East Lancaster Avenue, Suite 100, Radnor, PA 19087.

Item 1A. Risk Factors

Our business, financial condition, results from operations and ability to make distributions on our equity and to pay debt service on our indebtedness may be affected by the risk factors set forth below. All investors should consider the following risk factors before deciding to purchase our securities.

Adverse economic and geopolitical conditions could have a material adverse effect on our results of operations, financial condition and our ability to pay distributions to you.

Our business is affected by the ongoing recovery in the global economy, and other market or economic challenges experienced by the U.S. economy or the real estate industry as a whole. While there are signs of recovery in the U.S. economy, the recovery rate has been much slower than anticipated. Our portfolio consists primarily of office buildings (as compared to a more diversified real estate portfolio); if economic conditions again deteriorate, our results of operations, financial condition, financial results and

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ability to service current debt and to pay distributions to our shareholders may be adversely affected by the following, among other potential conditions:

• significant job losses in the financial and professional services industries may occur, which may decrease demand for our office space, causing market rental rates and property values to be negatively impacted;

• our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to complete development opportunities and refinance existing debt;

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

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

• reduced liquidity in debt markets and increased credit risk premiums for certain market participants may impair our ability to access capital;

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

• the value of our investments could deteriorate and we could be required to reduce the carrying value of our equity method investments if a loss in the carrying value of the investment is other than a temporary decline pursuant to the accounting standard governing the equity method of accounting.

These conditions, which could have a material adverse effect on our results of operations, financial condition and ability to pay distributions, may continue or worsen in the future.

Our performance is subject to risks associated with our properties and with the real estate industry.

Our economic performance and the value of our real estate assets, and consequently the value of our securities, are subject to the risk that if our properties do not generate revenues sufficient to meet our operating expenses, including debt service and capital expenditures, our cash flow and ability to pay distributions to our shareholders will be adversely affected. Events or conditions beyond our control that may adversely affect our operations or the value of our properties include:

• downturns in the national, regional and local economic climate including increases in the unemployment rate and inflation;

• competition from other office, mixed-use, industrial and commercial buildings;

• local real estate market conditions, such as oversupply or reduction in demand for office, industrial or commercial space;

• changes in interest rates and availability of financing;

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

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

• civil disturbances, earthquakes and other natural disasters, or terrorist acts or acts of war which may result in uninsured or underinsured losses;

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

• declines in the financial condition of our tenants and our ability to collect rents from our tenants.

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

We operate, are currently developing, and may in the future develop, properties either alone or through joint ventures with other persons that are known as “mixed-use” developments. This means that in addition to the development of office space, the project may also include space for residential, retail, hotel or other commercial purposes. We have limited experience in developing and managing non-office real estate. As a result, if a development project includes a non-office or non-retail use, we may seek to develop that component ourselves, sell the rights to that component to a third-party developer with experience in that use or we may seek to partner with such a developer. If we do not sell the rights or partner with such a developer, or if we choose to develop the other component ourselves, we would be exposed not only to those risks typically associated with the development of commercial real estate generally, but also to specific risks associated with the development and ownership of non-office and non-retail real estate. In addition, even if we sell the rights to develop certain components or elect to participate in the development through a joint venture, we may be exposed to the risks associated with the failure of the other party to complete the development as expected. These include the risk that the other party would default on its obligations necessitating that we complete the other component ourselves (including providing any necessary financing). In the case of residential properties, these risks include competition for

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prospective residents from other operators whose properties may be perceived to offer a better location or better amenities or whose rent may be perceived as a better value given the quality, location and amenities that the resident seeks. Because we have limited experience with residential properties, we expect to retain third parties to manage our residential properties. If we decide to not sell or participate in a joint venture and instead hire a third party manager, we would be dependent on them and their key personnel who provide services to us and we may not find a suitable replacement if the management agreement is terminated, or if key personnel leave or otherwise become unavailable to us.

We may suffer adverse consequences due to the financial difficulties, bankruptcy or insolvency of our tenants.

The current economic conditions have caused some of our tenants to experience financial difficulties. If more of our tenants were to continue to experience financial difficulties, including bankruptcy, insolvency or a general downturn in their business, there could be an adverse effect on our financial performance and distributions to shareholders. We cannot assure you that any tenant that files for bankruptcy protection will continue to pay us rent. A bankruptcy filing by or relating to one of our tenants or a lease guarantor would bar efforts by us to collect pre-bankruptcy debts from that tenant or lease guarantor, or its property, unless we receive an order permitting us to do so from the bankruptcy court. In addition, we cannot evict a tenant solely because of bankruptcy. The bankruptcy of a tenant or lease guarantor could delay our efforts to collect past due balances under the relevant leases, and could ultimately preclude collection of these sums. If a lease is assumed by the tenant in bankruptcy, all pre-bankruptcy balances due under the lease must be paid to us in full. If, however, a lease is rejected by a tenant in bankruptcy, we would have only a general, unsecured claim for damages. Any such unsecured claim would only be paid to the extent that funds are available and only in the same percentage as is paid to all other holders of general, unsecured claims. Restrictions under the bankruptcy laws further limit the amount of any other claims that we can make if a lease is rejected. As a result, it is likely that we would recover substantially less than the full value of the remaining rent during the term. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Factors that May Influence Future Results of Operations - Tenant Credit Risk."

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

As of December 31, 2013 we had $100.0 million of unhedged variable rate indebtedness and may incur additional such indebtedness in the future. If interest rates increase, then so would the interest costs on our unhedged variable rate debt, which could adversely affect our cash flow and our ability to pay principal and interest on our debt and our ability to make distributions to our shareholders. Further, rising interest rates could limit our ability to refinance existing debt when it matures or significantly increase our future interest expense. From time to time, we enter into interest rate swap agreements and other interest rate hedging contracts. While these agreements are intended to lessen the impact of rising interest rates on us, they also expose us to the risk that the other parties to the agreements will not perform, we could incur significant costs associated with the settlement of the agreements, the agreements will be unenforceable and the underlying transactions will fail to qualify as highly-effective cash flow hedges under the applicable accounting guidance. In addition, an increase in interest rates could decrease the amounts third-parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions.

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

Like other real estate companies which incur debt, we are subject to risks associated with debt financing, such as the insufficiency of cash flow to meet required debt service payment obligations and the inability to refinance existing indebtedness. If our debt cannot be paid, refinanced or extended at maturity, we may not be able to make distributions to shareholders at expected levels or at all. Furthermore, an increase in our interest expense could adversely affect our cash flow and ability to make distributions to shareholders. If we do not meet our debt service obligations, any properties securing such indebtedness could be foreclosed on, which would have a material adverse effect on our cash flow and ability to make distributions and, depending on the number of properties foreclosed on, could threaten our continued viability. Our degree of leverage could also make us more vulnerable to a downturn in business or the economy in general.

The terms and covenants relating to our indebtedness could adversely impact our economic performance.

Our credit facilities, term loans and the indenture governing our unsecured public debt securities contain (and any new or amended facility and term loans will contain) restrictions, requirements and other limitations on our ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt which we must maintain. Our ability to borrow under our credit facilities is subject to compliance with such financial and other covenants. In the event that we fail to satisfy these covenants, we would be in default under the credit facilities, the term loans and the indenture and may be required to repay such debt with capital from other sources. Under such circumstances, other sources of capital may not be available to us, or may be available only on unattractive terms. In addition, the mortgages on

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our properties contain customary covenants such as those that limit our ability, without the prior consent of the lender, to further mortgage the applicable property or to discontinue insurance coverage. If we breach covenants in our secured debt agreements, the lenders can declare a default and take possession of the property securing the defaulted loan.

A downgrading of our debt could subject us to higher borrowing costs.

In the event that our unsecured debt is downgraded by Moody’s Investor Services and Standard & Poor’s from the current ratings, we would likely incur higher borrowing costs and the market prices of our common shares and debt securities might decline.

We may experience increased operating costs, which might reduce our profitability.

Our properties are subject to increases in operating expenses such as for cleaning, electricity, heating, ventilation and air conditioning, administrative costs and other costs associated with security, landscaping and repairs and maintenance of our properties. In general, under our leases with tenants, we pass through all or a portion of these costs to them. We cannot assure you, however, that tenants will actually bear the full burden of these higher costs, or that such increased costs will not lead them, or other prospective tenants, to seek office space elsewhere. If operating expenses increase, the availability of other comparable office space in our core geographic markets might limit our ability to increase rents; if operating expenses increase without a corresponding increase in revenues, our profitability could diminish and limit our ability to make distributions to shareholders.

Our investment in property development or redevelopment may be more costly or difficult to complete than we anticipate.

We intend to continue to develop properties where market conditions warrant such investment. Once made, these investments may not produce results in accordance with our expectations. Risks associated with our development and construction activities include:

• the unavailability of favorable financing alternatives in the private and public debt markets;

• having sufficient capital to pay development costs;

• dependence on the financial and professional services sector as part of our tenant base;

• construction costs exceeding original estimates due to rising interest rates, diminished availability of materials and labor, and increases in the costs of materials and labor;

• construction and lease-up delays resulting in increased debt service, fixed expenses and construction or renovation costs;

• expenditure of funds and devotion of management’s time to projects that we do not complete;

• the unavailability or scarcity of utilities;

• occupancy rates and rents at newly completed properties may fluctuate depending on a number of factors, including market and economic conditions, resulting in lower than projected rental rates and a corresponding lower return on our investment;

• complications (including building moratoriums and anti-growth legislation) in obtaining necessary zoning, occupancy and other governmental permits; and

• increased use restrictions by local zoning or planning authorities limiting our ability to develop and impacting the size of developments.

See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Factors that May Influence Future Results of Operations - Development Risk."

We face risks associated with property acquisitions.

We have recently acquired properties, and may in the future continue to acquire properties and portfolios of properties, including large portfolios that would increase our size and potentially alter our capital structure. Although we believe that the acquisitions that we have completed and that we expect to undertake in the future have, and will, enhance our future financial performance, the success of such transactions is subject to a number of factors, including the risks that:

• we may not be able to obtain financing for acquisitions on favorable terms;

• acquired properties may fail to perform as expected;

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

• acquired properties may be located in new markets where we may have limited knowledge and understanding of the local economy, an absence of business relationships in the area or unfamiliarity with local governmental and permitting procedures; and

• we may not be able to efficiently integrate acquired properties, particularly portfolios of properties, into our organization and manage new properties in a way that allows us to realize cost savings and synergies.

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Acquired properties may subject us to known and unknown liabilities.

Properties that we acquire may be subject to known and unknown liabilities for which we would have no recourse, or only limited recourse, to the former owners of such properties. As a result, if a liability were asserted against us based upon ownership of an acquired property, we might be required to pay significant sums to settle it, which could adversely affect our financial results and cash flow. Unknown liabilities relating to acquired properties could include:

• liabilities for clean-up of pre-existing disclosed or undisclosed environmental contamination;

• claims by tenants, vendors or other persons arising on account of actions or omissions of the former owners of the properties; and

• liabilities incurred in the ordinary course of business.

The acquisition of new properties or the development of new properties which lack operating history with us may give rise to difficulties in predicting revenue potential.

New acquisitions and developments could fail to perform in accordance with expectations. If we fail to accurately estimate occupancy levels, operating costs or costs of improvements to bring an acquired property or a development property up to the standards established for our intended market position, the performance of the property may be below expectations. Acquired properties may have characteristics or deficiencies affecting their valuation or revenue potential that we have not yet discovered. We cannot assure you that the performance of properties acquired or developed by us will increase or be maintained under our management.

We have agreed not to sell certain of our properties and to maintain indebtedness subject to guarantees.

We acquired in the past and in the future may acquire properties or portfolios of properties through tax deferred contribution transactions in exchange for partnership interests in our Operating Partnership. This acquisition structure has the effect, among other factors, of reducing the amount of tax depreciation we can deduct over the tax life of the acquired properties, and typically requires that we agree to protect the contributors’ ability to defer recognition of taxable gain through restrictions on our ability to dispose of the acquired properties and/or the allocation of partnership debt to the contributors to maintain their tax bases. We agreed not to sell some of our properties for varying periods of time, in transactions that would trigger taxable income to the former owners, and we may enter into similar arrangements as a part of future property acquisitions. These agreements generally provide that we may dispose of the subject properties only in transactions that qualify as tax-free exchanges under Section 1031 of the Internal Revenue Code or in other tax deferred transactions. Such transactions can be difficult to complete and can result in the property acquired in exchange for the disposed of property inheriting the tax attributes (including tax protection covenants) of the sold property. Violation of these tax protection agreements would impose significant costs on us. As a result, we are restricted with respect to decisions related to financing, encumbering, expanding or selling these properties. These restrictions on dispositions could limit our ability to sell an asset or pay down partnership debt during a specified time, or on terms, that would be favorable absent such restrictions.

We have also entered into agreements that provide prior owners of properties with the right to guarantee specific amounts of indebtedness and, in the event that the specific indebtedness that they guarantee is repaid or reduced, we would be required to provide substitute indebtedness for them to guarantee. These agreements may hinder actions that we may otherwise desire to take to repay or refinance guaranteed indebtedness because we would be required to make payments to the beneficiaries of such agreements if we violate these agreements.

We may be unable to renew leases or re-lease space as leases expire; certain leases may expire early.

If tenants do not renew their leases upon expiration, we may be unable to re-lease the space. Even if the tenants do renew their leases or if we can re-lease the space, the terms of renewal or re-leasing (including the cost of required renovations) may be less favorable than the current lease terms. Certain leases grant the tenants an early termination right upon payment of a termination penalty or if we fail to comply with certain material lease terms. Our inability to renew or release spaces and the early termination of certain leases could affect our ability to make distributions to shareholders. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Factors that May Influence Future Results of Operations - Tenant Rollover Risk."

We face significant competition from other real estate developers.

We compete with real estate developers, operators and institutions for tenants and acquisition and development opportunities. Some of these competitors may have significantly greater financial resources than we have. Such competition may reduce the

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number of suitable investment opportunities available to us, may interfere with our ability to attract and retain tenants and may increase vacancies, which could result in increased supply and lower market rental rates, reducing our bargaining leverage and adversely affect our ability to improve our operating leverage. In addition, some of our competitors may be willing (e.g., because their properties may have vacancy rates higher than those for our properties) to make space available at lower rental rates or with higher tenant concession percentages than available space in our properties. We cannot assure you that this competition will not adversely affect our cash flow and our ability to make distributions to shareholders.

Property ownership through joint ventures may limit our ability to act exclusively in our interest.

We develop, acquire, and contribute properties in joint ventures with other persons or entities when we believe circumstances warrant the use of such structures. As of December 31, 2013, we had net investments totaling $180.5 million in 17 unconsolidated Real Estate Ventures. We could become engaged in a dispute with one or more of our joint venture partners that might affect our ability to operate a jointly-owned property. Moreover, our joint venture partners may, at any time, have business, economic or other objectives that are inconsistent with our objectives, including objectives that relate to the appropriate timing and terms of any sale or refinancing of a property. In some instances, our joint venture partners may have competing interests in our markets that could create conflicts of interest. If the objectives of our joint venture partners or the lenders to our joint ventures are inconsistent with our own objectives, we may not be able to act exclusively in our interests.

Because real estate is illiquid, we may not be able to sell properties when in our best interest.

Real estate investments generally, and in particular large office and industrial/flex properties like those that we own, often cannot be sold quickly. The capitalization rates at which properties may be sold could be higher than historic rates, thereby reducing our potential proceeds from sale. Consequently, we may not be able to alter our portfolio promptly in response to changes in economic or other conditions. In addition, the Internal Revenue Code limits our ability to sell properties that we have held for fewer than two years without potential adverse consequences to our shareholders. Furthermore, properties that we have developed and have owned for a significant period of time or that we acquired in exchange for partnership interests in the Operating Partnership often have a low tax basis. If we were to dispose of any of these properties in a taxable transaction, we may be required under provisions of the Internal Revenue Code applicable to REITs to distribute a significant amount of the taxable gain to our shareholders and this could, in turn, impact our cash flow. In some cases, tax protection agreements with third parties will prevent us from selling certain properties in a taxable transaction without incurring substantial costs. In addition, purchase options and rights of first refusal held by tenants or partners in joint ventures may also limit our ability to sell certain properties. All of these factors reduce our ability to respond to changes in the performance of our investments and could adversely affect our cash flow and ability to make distributions to shareholders as well as the ability of someone to purchase us, even if a purchase were in our shareholders’ best interests.

Some potential losses are not covered by insurance.

We currently carry comprehensive “all-risk” property, and rental loss insurance and commercial general liability coverage on all of our properties. We believe the policy specifications and insured limits of these policies are adequate and appropriate. There are, however, types of losses, such as lease and other contract claims, biological, radiological and nuclear hazards and acts of war that generally are not insured. We cannot assure you that we will be able to renew insurance coverage in an adequate amount or at reasonable prices. In addition, insurance companies may no longer offer coverage against certain types of losses, such as losses due to earthquake, terrorist acts and mold, flood, or, if offered, these types of insurance may be prohibitively expensive. Should an uninsured loss or a loss in excess of insured limits occur, we could lose all or a portion of the capital we have invested in a property, as well as the anticipated future revenue from the property. In such an event, we might nevertheless remain obligated for any mortgage debt or other financial obligations related to the property. We cannot assure you that material losses in excess of insurance proceeds will not occur in the future. If any of our properties were to experience a catastrophic loss, it could seriously disrupt our operations, delay revenue and result in large expenses to repair or rebuild the property. Such events could adversely affect our cash flow and ability to make distributions to shareholders. If one or more of our insurance providers were to fail to pay a claim as a result of insolvency, bankruptcy or otherwise, the nonpayment of such claims could have an adverse effect on our financial condition and results of operations. In addition, if one or more of our insurance providers were to become subject to insolvency, bankruptcy or other proceedings and our insurance policies with the provider were terminated or cancelled as a result of those proceedings, we cannot guarantee that we would be able to find alternative coverage in adequate amounts or at reasonable prices. In such case, we could experience a lapse in any or adequate insurance coverage with respect to one or more properties and be exposed to potential losses relating to any claims that may arise during such period of lapsed or inadequate coverage.

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Terrorist attacks and other acts of violence or war may adversely impact our performance and may affect the markets on which our securities are traded.

Terrorist attacks against our properties, or against the United States or our interests, may negatively impact our operations and the value of our securities. Attacks or armed conflicts could result in increased operating costs; for example, it might cost more in the future for building security, property and casualty insurance, and property maintenance. As a result of terrorist activities and other market conditions, the cost of insurance coverage for our properties could also increase. We might not be able to pass through the increased costs associated with such increased security measures and insurance to our tenants, which could reduce our profitability and cash flow. Furthermore, any terrorist attacks or armed conflicts could result in increased volatility in or damage to the United States and worldwide financial markets and economy. Such adverse economic conditions could affect the ability of our tenants to pay rent and our cost of capital, which could have a negative impact on our results.

Our ability to make distributions is subject to various risks.

Historically, we have paid quarterly distributions to our shareholders. Our ability to make distributions in the future will depend upon:

• the operational and financial performance of our properties;

• capital expenditures with respect to existing, developed and newly acquired properties;

• general and administrative costs associated with our operation as a publicly-held REIT;

• the amount of, and the interest rates on, our debt; and

• the absence of significant expenditures relating to environmental and other regulatory matters.

Certain of these matters are beyond our control and any significant difference between our expectations and actual results could have a material adverse effect on our cash flow and our ability to make distributions to shareholders.

Changes in the tax rates and regulatory requirements may adversely affect our cash flow.

Because increases in income and service taxes are generally not passed through to tenants under leases, such increases may adversely affect our cash flow and ability to make expected distributions to shareholders. Our properties are also subject to various regulatory requirements, such as those relating to the environment, fire and safety. Our failure to comply with these requirements could result in the imposition of fines and damage awards and could result in a default under some of our tenant leases. Moreover, the costs to comply with any new or different regulations could adversely affect our cash flow and our ability to make distributions. Although we believe that our properties are in material compliance with all such requirements, we cannot assure you that these requirements will not change or that newly imposed requirements will not require significant expenditures in order to be compliant.

Potential liability for environmental contamination could result in substantial costs.

Under various federal, state and local laws, ordinances and regulations, we may be liable for the costs to investigate and remove or remediate hazardous or toxic substances on or in our properties, often regardless of whether we know of or are responsible for the presence of these substances. These costs may be substantial. While we do maintain environmental insurance, we cannot be assured that our insurance coverage will be sufficient to protect us from all of the aforesaid remediation costs. Also, if hazardous or toxic substances are present on a property, or if we fail to properly remediate such substances, our ability to sell or rent the property or to borrow using that property as collateral may be adversely affected.

Other laws and regulations govern indoor and outdoor air quality including those that can require the abatement or removal of asbestos-containing materials in the event of damage, demolition, renovation or remodeling and also govern emissions of and exposure to asbestos fibers in the air. The maintenance and removal of lead paint and certain electrical equipment containing polychlorinated biphenyls (PCBs) and underground storage tanks are also regulated by federal and state laws. We are also subject to risks associated with human exposure to chemical or biological contaminants such as molds, pollens, viruses and bacteria which, above certain levels, can be alleged to be connected to allergic or other health effects and symptoms in susceptible individuals. We could incur fines for environmental compliance and be held liable for the costs of remedial action with respect to the foregoing regulated substances or tanks or related claims arising out of environmental contamination or human exposure to contamination at or from our properties.

Additionally, we develop, manage, lease and/or operate various properties for third parties. Consequently, we may be considered to have been or to be an operator of these properties and, therefore, potentially liable for removal or remediation costs or other potential costs that could relate to hazardous or toxic substances.

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An earthquake or other natural disasters could adversely affect our business.

Some of our properties are located in California which is a high risk geographical area for earthquakes or other natural disasters. Depending upon its magnitude, an earthquake could severely damage our properties which would adversely affect our business. We maintain earthquake insurance for our California properties and the resulting business interruption. We cannot assure that our insurance will be sufficient if there is a major earthquake.

Americans with Disabilities Act compliance could be costly.

The Americans with Disabilities Act of 1990, as amended (“ADA”), requires that all public accommodations and commercial facilities, including office buildings, meet certain federal requirements related to access and use by disabled persons. Compliance with ADA requirements could involve the removal of structural barriers from certain disabled persons’ entrances which could adversely affect our financial condition and results of operations. Other federal, state and local laws may require modifications to or restrict further renovations of our properties with respect to such accesses. Although we believe that our properties are in material compliance with present requirements, noncompliance with the ADA or similar or related laws or regulations could result in the United States government imposing fines or private litigants being awarded damages against us. In addition, changes to existing requirements or enactments of new requirements could require significant expenditures. Such costs may adversely affect our cash flow and ability to make distributions to shareholders.

Failure to qualify as a REIT would subject us to U.S. federal income tax which would reduce the cash available for distribution to our shareholders.

We operate our business to qualify to be taxed as a REIT for federal income tax purposes. We have not requested and do not plan to request a ruling from the IRS that we qualify as a REIT, and the statements in this Report are not binding on the IRS or any court. As a REIT, we generally will not be subject to federal income tax on the income that we distribute currently to our shareholders. Many of the REIT requirements, however, are highly technical and complex. The determination that we are a REIT requires an analysis of various factual matters and circumstances that may not be totally within our control. For example, to qualify as a REIT, at least 95% of our gross income must come from specific passive sources, such as rent, that are itemized in the REIT tax laws. In addition, to qualify as a REIT, we cannot own specified amounts of debt and equity securities of some issuers. We also are required to distribute to our shareholders with respect to each year at least 90% of our REIT taxable income (excluding net capital gains). The fact that we hold substantially all of our assets through the Operating Partnership and its subsidiaries and joint ventures further complicates the application of the REIT requirements for us. Even a technical or inadvertent mistake could jeopardize our REIT status and, given the highly complex nature of the rules governing REITs and the ongoing importance of factual determinations, we cannot provide any assurance that we will continue to qualify as a REIT. Furthermore, Congress and the IRS might make changes to the tax laws and regulations, and the courts might issue new rulings, that make it more difficult, or impossible, for us to remain qualified as a REIT. If we fail to qualify as a REIT for federal income tax purposes and are able to avail ourselves of one or more of the statutory savings provisions in order to maintain our REIT status, we would nevertheless be required to pay penalty taxes of $50,000 or more for each such failure.

If we fail to qualify as a REIT for federal income tax purposes, and are unable to avail ourselves of certain savings provisions set forth in the Internal Revenue Code, we would be subject to federal income tax at regular corporate rates on all of our income. As a taxable corporation, we would not be allowed to take a deduction for distributions to shareholders in computing our taxable income or pass through long term capital gains to individual shareholders at favorable rates. We also could be subject to the federal alternative minimum tax and possibly increased state and local taxes. We would not be able to elect to be taxed as a REIT for four years following the year we first failed to qualify unless the IRS were to grant us relief under certain statutory provisions. If we failed to qualify as a REIT, we would have to pay significant income taxes, which would reduce our net earnings available for investment or distribution to our shareholders. This likely would have a significant adverse effect on our earnings and likely would adversely affect the value of our securities. In addition, we would no longer be required to pay any distributions to shareholders.

Failure of the Operating Partnership (or a subsidiary partnership or joint venture) to be treated as a partnership would have serious adverse consequences to our shareholders.

If the IRS were to successfully challenge the tax status of the Operating Partnership or any of its subsidiary partnerships or joint ventures for federal income tax purposes, the Operating Partnership or the affected subsidiary partnership or joint venture would be taxable as a corporation. In such event we would cease to qualify as a REIT and the imposition of a corporate tax on the Operating Partnership, subsidiary partnership or joint venture would reduce the amount of cash available for distribution from the Operating Partnership to us and ultimately to our shareholders.

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To maintain our REIT status, we may be forced to borrow funds on a short term basis during unfavorable market conditions.

As a REIT, we are subject to certain distribution requirements, including the requirement to distribute 90% of our REIT taxable income. That may result in our having to make distributions at a disadvantageous time or to borrow funds at unfavorable rates. Compliance with this requirement may hinder our ability to operate solely on the basis of maximizing profits.

We will pay some taxes even if we qualify as a REIT, which will reduce the cash available for distribution to our shareholders.

Even if we qualify as a REIT for federal income tax purposes, we will be required to pay certain federal, state and local taxes on our income and property. For example, we will be subject to income tax to the extent we distribute less than 100% of our REIT taxable income, including capital gains. Additionally, we will be subject to a 4% nondeductible excise tax on the amount, if any, by which dividends paid by us in any calendar year are less than the sum of 85% of our ordinary income, 95% of our capital gain net income and 100% of our undistributed income from prior years. Moreover, if we have net income from “prohibited transactions,” that income will be subject to a 100% penalty tax. In general, prohibited transactions are sales or other dispositions of property held primarily for sale to customers in the ordinary course of business. The determination as to whether a particular sale is a prohibited transaction depends on the facts and circumstances related to that sale. We cannot guarantee that sales of our properties would not be prohibited transactions unless we comply with certain statutory safe-harbor provisions.

In addition, any net taxable income earned directly by our taxable REIT subsidiaries, or through entities that are disregarded for federal income tax purposes as entities separate from our taxable REIT subsidiaries, will be subject to federal and possibly state corporate income tax. In this regard, several provisions of the laws applicable to REITs and their subsidiaries ensure that a taxable REIT subsidiary will be subject to an appropriate level of federal income taxation. For example, a taxable REIT subsidiary is limited in its ability to deduct certain interest payments made to an affiliated REIT. In addition, the REIT has to pay a 100% penalty tax on some payments that it receives or on some deductions taken by a taxable REIT subsidiary if the economic arrangements between the REIT, the REIT’s customers, and the taxable REIT subsidiary are not comparable to similar arrangements between unrelated parties. Finally, some state and local jurisdictions may tax some of our income even though as a REIT we are not subject to federal income tax on that income because not all states and localities follow the federal income tax treatment of REITs. To the extent that we and our affiliates are required to pay federal, state and local taxes, we will have less cash available for distributions to our shareholders.

We face possible federal, state and local tax audits.

Because we are organized and qualify as a REIT, we are generally not subject to federal income taxes, but are subject to certain state and local taxes. Certain entities through which we own real estate have undergone tax audits. There can be no assurance that future audits will not have a material adverse effect on our results of operations.

Competition for skilled personnel could increase labor costs.

We compete with various other companies in attracting and retaining qualified and skilled personnel. We depend on our ability to attract and retain skilled management personnel who are responsible for the day-to-day operations of our company. Competitive pressures may require that we enhance our pay and benefits package to compete effectively for such personnel. We may not be able to offset such added costs by increasing the rates we charge our tenants. If there is an increase in these costs or if we fail to attract and retain qualified and skilled personnel, our business and operating results could be harmed.

We are dependent upon our key personnel.

We are dependent upon our key personnel whose continued service is not guaranteed. We are dependent on our executive officers for strategic business direction and real estate experience. Loss of their services could adversely affect our operations.

Although we have an employment agreement with Gerard H. Sweeney, our President and Chief Executive Officer, this agreement does not restrict his ability to become employed by a competitor following the termination of his employment. We do not have key man life insurance coverage on our executive officers.

Certain limitations will exist with respect to a third party’s ability to acquire us or effectuate a change in control.

Limitations imposed to protect our REIT status. In order to protect us against the loss of our REIT status, our Declaration of Trust limits any shareholder from owning more than 9.8% in value of our outstanding shares, subject to certain exceptions. The ownership limit may have the effect of precluding acquisition of control of us. If anyone acquires shares in excess of the ownership limit, we may:

• consider the transfer to be null and void;

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• not reflect the transaction on our books;

• institute legal action to stop the transaction;

• not pay dividends or other distributions with respect to those shares;

• not recognize any voting rights for those shares; and

• consider the shares held in trust for the benefit of a person to whom such shares may be transferred.

Limitation due to our ability to issue preferred shares. Our Declaration of Trust authorizes our Board of Trustees to cause us to issue preferred shares, without limitation as to amount and without shareholder consent. Our Board of Trustees is able to establish the preferences and rights of any preferred shares issued and these shares could have the effect of delaying or preventing someone from taking control of us, even if a change in control were in our shareholders’ best interests.

Limitation imposed by the Maryland Business Combination Law. The Maryland General Corporation Law, as applicable to Maryland REITs, establishes special restrictions against “business combinations” between a Maryland REIT and “interested shareholders” or their affiliates unless an exemption is applicable. An interested shareholder includes a person, who beneficially owns, and an affiliate or associate of the trust who, at any time within the two-year period prior to the date in question, was the beneficial owner of, ten percent or more of the voting power of our then-outstanding voting shares. Among other things, Maryland law prohibits (for a period of five years) a merger and certain other transactions between a Maryland REIT and an interested shareholder unless the board of trustees had approved the transaction before the party became an interested shareholder. The five-year period runs from the most recent date on which the interested shareholder became an interested shareholder. Thereafter, any such business combination must be recommended by the board of trustees and approved by two super-majority shareholder votes unless, among other conditions, the common shareholders receive a minimum price for their shares and the consideration is received in cash or in the same form as previously paid by the interested shareholder for our shares or unless the board of trustees approved the transaction before the party in question became an interested shareholder. The business combination statute could have the effect of discouraging offers to acquire us and of increasing the difficulty of consummating any such offers, even if the acquisition would be in our shareholders’ best interests.

Maryland Control Share Acquisition Act. Maryland law provides that “control shares” of a REIT acquired in a “control share acquisition” shall have no voting rights except to the extent approved by a vote of two-thirds of the vote eligible to be cast on the matter under the Maryland Control Share Acquisition Act. Shares construed as “control shares” means that, if aggregated with all other shares previously acquired by the acquirer or in respect of which the acquirer is able to exercise or direct the exercise of voting power (except solely by virtue of a revocable proxy), would entitle the acquirer to exercise voting power in electing trustees within one of the following ranges of voting power: one-tenth or more but less than one-third, one-third or more but less than a majority or 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 shareholder approval. A “control share acquisition” means the acquisition of control shares, subject to certain exceptions. If voting rights or control shares acquired in a control share acquisition are not approved at a shareholder’s meeting, then subject to certain conditions and limitations the issuer may redeem any or all of the control shares for fair value. If voting rights of such control shares are approved at a shareholder’s meeting and the acquirer becomes entitled to vote a majority of the shares entitled to vote, all other shareholders may exercise appraisal rights. Any control shares acquired in a control share acquisition which are not exempt under our Bylaws are subject to the Maryland Control Share Acquisition Act. Our Bylaws contain a provision exempting from the control share acquisition statute any and all acquisitions by any person of our shares. We cannot assure you that this provision will not be amended or eliminated at any time in the future.

Advance Notice Provisions for Shareholder Nominations and Proposals. Our bylaws require advance notice for shareholders to nominate persons for election as trustees at, or to bring other business before, any meeting of our shareholders. This bylaw provision limits the ability of shareholders to make nominations of persons for election as trustees or to introduce other proposals unless we are notified in a timely manner prior to the meeting.

Many factors can have an adverse effect on the market value of our securities.

A number of factors might adversely affect the price of our securities, many of which are beyond our control. These factors include:

• increases in market interest rates, relative to the dividend yield on our shares. If market interest rates go up, prospective purchasers of our securities may require a higher yield. Higher market interest rates would not, however, result in more funds for us to distribute and, to the contrary, would likely increase our borrowing costs and potentially decrease funds available for distribution. Thus, higher market interest rates could cause the market price of our common shares to go down;

• anticipated benefit of an investment in our securities as compared to investment in securities of companies in other industries (including benefits associated with tax treatment of dividends and distributions);

• perception by market professionals of REITs generally and REITs comparable to us in particular;

• level of institutional investor interest in our securities;

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• relatively low trading volumes in securities of REITs;

• our results of operations and financial condition; and

• investor confidence in the stock market generally.

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

Additional issuances of equity securities may be dilutive to shareholders.

The interests of our shareholders could be diluted if we issue additional equity securities to finance future developments or acquisitions or to repay indebtedness. Our Board of Trustees may authorize the issuance of additional equity securities without shareholder approval. Our ability to execute our business strategy depends upon our access to an appropriate blend of debt financing, including unsecured lines of credit and other forms of secured and unsecured debt, and equity financing, including the issuance of common and preferred equity.

The issuance of preferred securities may adversely affect the rights of holders of our common shares.

Because our Board of Trustees has the power to establish the preferences and rights of each class or series of preferred shares, we may afford the holders in any series or class of preferred shares preferences, distributions, powers and rights, voting or otherwise, senior to the rights of holders of common shares. Our Board of Trustees also has the power to establish the preferences and rights of each class or series of units in the Operating Partnership, and may afford the holders in any series or class of preferred units preferences, distributions, powers and rights, voting or otherwise, senior to the rights of holders of common units.

Our performance is dependent upon the economic conditions of the markets in which our properties are located.

Our properties are located in Pennsylvania, New Jersey, Delaware, Maryland, Virginia, Texas, and California. Like other real estate markets, these commercial real estate markets have been impacted by the ongoing economic recovery from the recent recession, and any adverse changes in economic conditions in the future in any of these economies or real estate markets could negatively affect cash available for distribution. Our financial performance and ability to make distributions to our shareholders will be particularly sensitive to the economic conditions in these markets. The local economic climate, which may be adversely impacted by business layoffs or downsizing, industry slowdowns, changing demographics and other factors, and local real estate conditions, such as oversupply of or reduced demand for office, industrial and other competing commercial properties, may affect revenues and the value of properties, including properties to be acquired or developed. We cannot assure you that these local economies will grow in the future.

Data security breaches may cause damage to our business and reputation.

In the ordinary course of our business we maintain sensitive data, including our proprietary business information and the information of our tenants and business partners, in our data centers and on our networks. Notwithstanding the security measures undertaken, our information technology may be vulnerable to attacks or breached and result in proprietary information being publicly disclosed, lost or stolen. Any such data breach could disrupt our operations and damage our reputation, which may in turn have an adverse impact on our results of operations.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

Property Acquisitions

One and Two Commerce Square

On December 19, 2013, we increased our equity ownership interest in One and Two Commerce Square, two Class A trophy office properties in Philadelphia, Pennsylvania, from 25% to 99%. These two properties contain 1,896,142 of net rentable square feet of office space and were 83.7% and 89.6% occupied, respectively, as of December 31, 2013. We acquired the additional ownership interests from an unaffiliated third party for cash proceeds of $73.1 million. We used available corporate funds for the cash portion of the acquisition price.

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In connection with the acquisition of One Commerce Square, we assumed a $125.1 million existing non-recourse first mortgage with a fixed interest rate of 5.67% and a maturity date of January 6, 2016. In connection with the acquisition of Two Commerce Square, we assumed a $112.0 million existing non-recourse first mortgage with a fixed interest rate of 3.96% and a maturity date of April 5, 2023.

Four Points Centre

On December 19, 2013, we acquired, from an unaffiliated third party, a two-building office property totaling 192,396 of net rentable square feet known as Four Points Centre, together with 22.3 acres of nearby land parcels in Austin, Texas for an aggregate of $47.3 million. The office property was 99.2% occupied as of December 31, 2013. We funded the acquisition price with available corporate funds.

Cira Centre

On November 19, 2013, we acquired, from an unaffiliated third party, the 0.8 acre land parcel underlying our Cira Centre office tower in Philadelphia, Pennsylvania for $24.6 million. We had developed and owned Cira Centre on land subject to a long-term ground lease, and our acquisition of the land resulted in termination of the ground lease. We funded the acquisition with available corporate funds and capitalized $1.4 million of acquisition related costs as part of basis in the operating land.

Three Logan Square

On April 25, 2013, we acquired, the 1.8 acre land parcel underlying our Three Logan Square office tower in Philadelphia, Pennsylvania for $20.8 million. We acquired Three Logan Square in 2010 on land subject to a long-term ground lease, and, as part of our 2010 acquisition, held an option to acquire the land. Our 2013 acquisition of the land resulted in termination of the ground lease. We funded the acquisition with available corporate funds and capitalized $0.1 million of acquisition related costs as part of basis in the operating land.

Development and Redevelopment Properties Placed in Service

During 2013, we did not place any development or redevelopment properties into service. At December 31, 2013, we were proceeding on the following activity:

Construction Commencement Date	Expected Completion	Activity Type	Property/Portfolio Name	Location	Number of Buildings	Square Footage	Budgeted Costs (000's)		Costs Incurred(000's)
April-13	Q1 2014	Development	200 Radnor Chester Road	Radnor, PA	1	17,884	$	7,434	$	6,044
Jan-12	Q1 2014	Redevelopment	660 West Germantown Pike	Plymouth Meeting, PA	1	154,392	27,910		26,668
			Total		2	172,276	$	35,344	$	32,712

As discussed above in Item 1 under the heading “2013 Transactions,” as of December 31, 2013, we were proceeding through two of our unconsolidated real estate ventures (evo at Cira Centre and The Parc at Plymouth Meeting) on two development projects.   In addition, as also discussed in Item 1 above, as of December 31, 2013, we had entered into two leases with third parties under which we have agreed to develop the Cira Walnut Tower for initial occupancy during the second quarter of 2016.

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Property Sales

We sold the following office properties during the year ended December 31, 2013:

Month of Sale	Property/Portfolio Name	Location	# of Properties	Rentable Square Feet	Property/Portfolio Occupancy % at Date of Sale		Net Proceeds on Sale (000's)		Gain (Loss) on Sale (000's) (a)
Dec-13	875 First Avenue	King of Prussia, PA	1	50,000	—	%	$	3,658	$	131
Oct-13	1336 Enterprise Drive	West Chester, PA	1	39,330	—	%	2,521		156
Oct-13	Austin Properties/DRA JV (b)	Austin, TX	7	1,398,826	96.8	%	270,749		25,921
Jun-13	The Bluffs	San Diego, CA	1	68,708	98.8	%	17,403		(856		)
Jun-13	100 Arrandale Boulevard	Exton, PA	1	34,931	—	%	3,268		(400		)
Jun-13	1700 Paoli Pike	Malvern, PA	1	28,000	—	%	2,544		(444		)
Jun-13	Pacific View Plaza	Carlsbad, CA	1	51,695	90.5	%	9,950		(521		)
Feb-13	Princeton Pike Corp Center	Lawrenceville, NJ	8	800,546	86.9	%	112,876		5,316
	Total Office Properties Sold		21	2,472,036			$	422,969	$	29,303

(a) Includes closing and other transaction related costs.

(b) The Austin Properties were contributed to an unconsolidated real estate venture.

We sold the following land parcel during the year ended December 31, 2013:

Month of Sale	Property/Portfolio Name	Location	# of Parcels	Acres	Property/Portfolio Occupancy % at Date of Sale		Net Proceeds on Sale (in thousands)		Gain (Loss) on Sale (a)
Aug-13	Dabney Land East	Richmond, VA	1	8.0	—	%	$	511	$	(137	)
	Total Land Sold		1	8.0			$	511	$	(137	)

(a) Includes closing and other transaction related costs.

28

Properties

As of December 31, 2013, we owned 204 properties that contain an aggregate of approximately 24.8 million net rentable square feet and consist of 176 office properties, 19 industrial facilities, five mixed-use properties (200 core properties), one development property, two redevelopment properties and one re-entitlement property. The properties are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas; and Oakland, Concord, and Carlsbad, California. As of December 31, 2013, the properties were approximately 89.5% occupied by 1,376 tenants and had an average age of approximately 21.6 years. The office properties are a combination of urban, transit oriented and suburban office buildings containing an average of approximately 131,085 net rentable square feet. The industrial and mixed-use properties accommodate a variety of tenant uses, including light manufacturing, assembly, distribution and warehousing. We carry comprehensive liability, fire, extended coverage and rental loss insurance covering all of the properties, with policy specifications and insured limits which we believe are adequate.

The following table sets forth information with respect to our core properties at December 31, 2013:

		Location	State	Year Built/ Renovated	Net Rentable Square Feet	Percentage Leased as of December 31, 2013 (a)		Total Base Rent for the Twelve Months Ended December 31, 2013 (b) (000's)		Average Annualized Rental Rate as of December 31, 2013 (c)
PENNSYLVANIA SUBURBS SEGMENT
150 Radnor Chester Road		Radnor	PA	1983	340,380	100.0	%	$	9,948	$	33.39
201 King of Prussia Road		Radnor	PA	2001	251,434	100.0	%	6,827		31.54
555 Lancaster Avenue		Radnor	PA	1973	241,687	98.7	%	6,579		32.38
401 Plymouth Road		Plymouth Meeting	PA	2001	204,186	93.7	%	5,256		29.26
One Radnor Corporate Center		Radnor	PA	1998	201,874	100.0	%	5,407		27.39
101 West Elm Street		W. Conshohocken	PA	1999	173,827	94.4	%	4,068		26.32
Five Radnor Corporate Center		Radnor	PA	1998	164,505	95.1	%	4,552		31.37
Four Radnor Corporate Center		Radnor	PA	1995	164,464	100.0	%	4,041		27.78
751-761 Fifth Avenue		King Of Prussia	PA	1967	158,000	100.0	%	704		4.13
630 Allendale Road		King of Prussia	PA	2000	150,000	61.9	%	1,974		25.35
640 Freedom Business Center	(d)	King Of Prussia	PA	1991	132,000	81.0	%	2,154		23.10
52 Swedesford Square		East Whiteland Twp.	PA	1988	131,017	69.3	%	1,434		12.67
400 Berwyn Park		Berwyn	PA	1999	124,182	95.4	%	2,801		26.38
4000 Chemical Road		Plymouth Meeting	PA	2007	120,877	100.0	%	3,020		29.33
Three Radnor Corporate Center		Radnor	PA	1998	119,087	100.0	%	3,249		31.24
101 Lindenwood Drive		Malvern	PA	1988	118,121	100.0	%	2,385		21.76
181 Washington Street		Conshohocken	PA	1999	116,174	87.9	%	1,443		25.22
300 Berwyn Park		Berwyn	PA	1989	107,702	96.8	%	2,249		24.82
Two Radnor Corporate Center		Radnor	PA	1998	97,576	100.0	%	2,652		22.97
301 Lindenwood Drive		Malvern	PA	1984	97,813	100.0	%	1,771		18.30
1 West Elm Street		W. Conshohocken	PA	1999	97,737	100.0	%	2,654		9.40
555 Croton Road		King of Prussia	PA	1999	96,909	74.5	%	1,446		22.73
500 North Gulph Road		King Of Prussia	PA	1979	93,082	51.4	%	827		19.83
620 West Germantown Pike		Plymouth Meeting	PA	1990	90,183	100.0	%	1,635		26.30
610 West Germantown Pike		Plymouth Meeting	PA	1987	90,088	94.2	%	1,692		25.04
630 West Germantown Pike		Plymouth Meeting	PA	1988	89,870	95.3	%	2,281		29.99
600 West Germantown Pike		Plymouth Meeting	PA	1986	89,626	91.3	%	1,787		26.58
630 Freedom Business Center	(d)	King Of Prussia	PA	1989	86,683	95.8	%	1,624		22.15
1200 Swedesford Road		Berwyn	PA	1994	86,622	100.0	%	1,824		29.57
620 Freedom Business Center	(d)	King Of Prussia	PA	1986	86,570	100.0	%	1,690		23.94
595 East Swedesford Road		Wayne	PA	1998	81,890	100.0	%	1,672		22.69
1050 Westlakes Drive		Berwyn	PA	1984	80,000	100.0	%	2,143		28.25
One Progress Drive		Horsham	PA	1986	79,204	80.0	%	798		19.59
1060 First Avenue	(d)	King Of Prussia	PA	1987	77,718	100.0	%	1,228		22.48
741 First Avenue		King Of Prussia	PA	1966	77,184	100.0	%	376		6.25
1040 First Avenue	(d)	King Of Prussia	PA	1985	75,488	100.0	%	191		—
200 Berwyn Park		Berwyn	PA	1987	75,025	83.1	%	1,319		24.61
1020 First Avenue	(d)	King Of Prussia	PA	1984	74,556	100.0	%	1,830		22.53
1000 First Avenue	(d)	King Of Prussia	PA	1980	74,139	84.7	%	1,431		23.09

29

		Location	State	Year Built/ Renovated	Net Rentable Square Feet	Percentage Leased as of December 31, 2013 (a)		Total Base Rent for the Twelve Months Ended December 31, 2013 (b) (000's)		Average Annualized Rental Rate as of December 31, 2013 (c)
130 Radnor Chester Road		Radnor	PA	1983	71,349	100.0	%	2,150		33.83
14 Campus Boulevard		Newtown Square	PA	1998	69,542	100.0	%	1,815		27.72
170 Radnor Chester Road		Radnor	PA	1983	68,143	100.0	%	1,534		21.30
500 Enterprise Road		Horsham	PA	1990	66,751	100.0	%	823		20.13
575 East Swedesford Road		Wayne	PA	1985	66,265	100.0	%	1,229		28.94
610 Freedom Business Center	(d)	King Of Prussia	PA	1985	62,991	97.7	%	1,042		22.05
925 Harvest Drive		Blue Bell	PA	1990	62,957	86.6	%	924		20.89
980 Harvest Drive		Blue Bell	PA	1988	62,379	94.0	%	1,132		18.86
426 Lancaster Avenue		Devon	PA	1990	61,102	100.0	%	1,213		22.93
1180 Swedesford Road		Berwyn	PA	1987	60,371	66.6	%	612		4.26
1160 Swedesford Road		Berwyn	PA	1986	60,099	89.6	%	156		—
100 Berwyn Park		Berwyn	PA	1986	57,730	96.1	%	986		23.35
640 Allendale Road	(f)	King of Prussia	PA	2000	56,034	100.0	%	314		7.94
565 East Swedesford Road		Wayne	PA	1984	55,456	98.6	%	936		20.97
650 Park Avenue		King Of Prussia	PA	1968	54,338	100.0	%	855		17.29
910 Harvest Drive		Blue Bell	PA	1990	52,611	100.0	%	1,040		22.02
2240/50 Butler Pike		Plymouth Meeting	PA	1984	52,229	100.0	%	960		22.14
920 Harvest Drive		Blue Bell	PA	1990	51,875	100.0	%	1,055		21.88
660 Allendale Road		King of Prussia	PA	2011	50,635	100.0	%	677		16.89
620 Allendale Road		King Of Prussia	PA	1961	50,000	100.0	%	629		13.81
15 Campus Boulevard		Newtown Square	PA	2002	49,621	100.0	%	1,223		27.13
17 Campus Boulevard		Newtown Square	PA	2001	48,565	100.0	%	1,137		27.30
11 Campus Boulevard		Newtown Square	PA	1998	47,700	100.0	%	998		22.45
585 East Swedesford Road		Wayne	PA	1998	43,683	100.0	%	775		29.61
1100 Cassett Road		Berwyn	PA	1997	43,480	100.0	%	1,204		27.75
600 Park Avenue		King Of Prussia	PA	1964	39,000	100.0	%	234		6.00
18 Campus Boulevard		Newtown Square	PA	1990	37,374	52.6	%	530		23.73
300 Lindenwood Drive		Malvern	PA	1991	33,000	100.0	%	794		25.77
2260 Butler Pike		Plymouth Meeting	PA	1984	31,892	100.0	%	397		22.94
120 West Germantown Pike		Plymouth Meeting	PA	1984	30,574	100.0	%	483		17.24
140 West Germantown Pike		Plymouth Meeting	PA	1984	25,357	100.0	%	519		23.86
100 Lindenwood Drive		Malvern	PA	1985	18,400	100.0	%	373		22.83
200 Lindenwood Drive		Malvern	PA	1984	12,600	100.0	%	212		19.20
SUBTOTAL - PENNSYLVANIA SUBURBS SEGMENT					6,471,583	94.3	%	$	129,923	$	24.38
PHILADELPHIA CENTRAL BUSINESS DISTRICT SEGMENT
1717 Arch Street		Philadelphia	PA	1990	1,029,413	96.1	%	$	21,968	$	28.76
Two Commerce Square		Philadelphia	PA	1992	953,276	90.4	%	703		25.15
One Commerce Square		Philadelphia	PA	1987	942,866	84.2	%	738		28.18
2970 Market Street		Philadelphia	PA	2010	862,692	100.0	%	19,543		31.42
2929 Arch Street	(d)	Philadelphia	PA	2005	730,187	100.0	%	25,929		36.45
100 North 18th Street	(e)	Philadelphia	PA	1988	708,844	86.1	%	16,493		31.28
130 North 18th Street		Philadelphia	PA	1989	595,041	91.3	%	12,917		30.43
101 - 103 Juniper Street	(i), (g)	Philadelphia	PA	2011	N/A	—	%	—		—
2930 Chestnut Street	(d), (g)	Philadelphia	PA	2010	553,421	100.0	%	200		11.54
3020 Market Street		Philadelphia	PA	2008	190,925	90.7	%	2,753		21.97
Philadelphia Marine Center	(d), (g)	Philadelphia	PA	Various	181,900	100.0	%	1,299		4.79
SUBTOTAL - PHILADELPHIA CENTRAL BUSINESS DISTRICT					6,748,565	93.3	%	$	102,543	$	27.44

30

		Location	State	Year Built/ Renovated	Net Rentable Square Feet	Percentage Leased as of December 31, 2013 (a)		Total Base Rent for the Twelve Months Ended December 31, 2013 (b) (000's)		Average Annualized Rental Rate as of December 31, 2013 (c)
METROPOLITAN WASHINGTON D.C. SEGMENT
1676 International Drive		McLean	VA	1999	299,387	96.8	%	$	10,565	$	35.35
2340 Dulles Corner Boulevard		Herndon	VA	1987	264,405	100.0	%	8,012		33.53
2291 Wood Oak Drive		Herndon	VA	1999	230,389	100.0	%	7,837		34.05
1900 Gallows Road		Vienna	VA	1989	210,632	87.5	%	5,177		25.76
3141 Fairview Park Drive	(h)	Falls Church	VA	1988	183,618	97.4	%	4,526		28.55
2411 Dulles Corner Park		Herndon	VA	1990	180,510	79.1	%	3,972		32.15
2355 Dulles Corner Boulevard		Herndon	VA	1988	179,176	77.0	%	4,230		32.74
1880 Campus Commons Drive		Reston	VA	1985	172,943	97.1	%	3,680		23.87
2121 Cooperative Way		Herndon	VA	2000	162,578	92.8	%	4,167		16.43
6600 Rockledge Drive	(d)	Bethesda	MD	1981	160,173	100.0	%	4,560		31.71
8260 Greensboro Drive		McLean	VA	1980	158,961	90.3	%	3,588		27.76
2251 Corporate Park Drive		Herndon	VA	2000	158,016	100.0	%	4,689		32.03
12015 Lee Jackson Memorial Highway		Fairfax	VA	1985	153,255	82.6	%	3,498		27.07
13880 Dulles Corner Lane		Herndon	VA	1997	151,853	71.6	%	2,443		19.90
8521 Leesburg Pike		Vienna	VA	1984	150,897	97.6	%	2,453		25.68
2273 Research Boulevard		Rockville	MD	1999	147,689	100.0	%	4,111		30.14
2275 Research Boulevard		Rockville	MD	1990	147,650	62.0	%	2,852		21.45
2201 Cooperative Way		Herndon	VA	1990	128,173	76.2	%	1,788		19.91
2277 Research Boulevard		Rockville	MD	1986	137,045	100.0	%	3,763		30.98
11781 Lee Jackson Memorial Highway		Fairfax	VA	1982	130,935	77.8	%	2,466		25.04
11720 Beltsville Drive		Beltsville	MD	1987	128,903	58.8	%	1,859		25.01
13825 Sunrise Valley Drive		Herndon	VA	1989	103,967	96.0	%	1,505		15.38
198 Van Buren Street		Herndon	VA	1996	98,934	100.0	%	1,521		10.61
196 Van Buren Street		Herndon	VA	1991	98,291	88.2	%	2,359		28.42
11700 Beltsville Drive		Beltsville	MD	1981	96,843	82.8	%	2,015		25.21
11710 Beltsville Drive		Beltsville	MD	1987	81,281	67.6	%	1,032		19.38
4401 Fair Lakes Court		Fairfax	VA	1988	55,972	87.7	%	1,387		28.81
11740 Beltsville Drive		Beltsville	MD	1987	6,783	100.0	%	132		23.48
SUBTOTAL - METROPOLITAN WASHINGTON D.C. SEGMENT					4,179,259	89.0	%	$	100,187	$	27.11
NEW JERSEY/DELAWARE SEGMENT
300 Delaware Avenue		Wilmington	DE	1989	298,071	78.8	%	$	2,699	$	14.56
920 North King Street		Wilmington	DE	1989	203,328	96.7	%	4,183		27.59
10000 Midlantic Drive		Mt. Laurel	NJ	1990	186,908	82.5	%	1,873		20.97
400 Commerce Drive		Newark	DE	1997	154,086	84.1	%	2,076		18.37
457 Haddonfield Road		Cherry Hill	NJ	1990	121,737	95.2	%	1,877		23.71
2000 Midlantic Drive		Mt. Laurel	NJ	1989	121,658	72.0	%	1,339		21.36
700 East Gate Drive		Mt. Laurel	NJ	1984	119,272	100.0	%	1,800		23.44
1000 Howard Boulevard		Mt. Laurel	NJ	1988	105,312	97.4	%	1,497		13.72
One Righter Parkway	(d)	Wilmington	DE	1989	104,761	100.0	%	2,322		24.48
1000 Atrium Way		Mt. Laurel	NJ	1989	99,668	100.0	%	1,190		21.41
Two Righter Parkway	(d)	Wilmington	DE	1987	95,514	100.0	%	1,838		21.41
1120 Executive Boulevard		Mt. Laurel	NJ	1987	95,183	42.3	%	473		17.78
15000 Midlantic Drive		Mt. Laurel	NJ	1991	84,056	94.1	%	1,060		22.30
220 Lake Drive East		Cherry Hill	NJ	1988	78,509	88.8	%	838		22.73
200 Lake Drive East		Cherry Hill	NJ	1989	76,352	88.7	%	1,063		25.29
200 Commerce Drive		Newark	DE	1998	68,034	100.0	%	1,327		21.42
9000 Midlantic Drive		Mt. Laurel	NJ	1989	67,299	90.0	%	849		21.46
100 Commerce Drive		Newark	DE	1989	62,787	77.8	%	797		18.94
701 East Gate Drive		Mt. Laurel	NJ	1986	61,794	94.4	%	602		19.24

31

		Location	State	Year Built/ Renovated	Net Rentable Square Feet	Percentage Leased as of December 31, 2013 (a)		Total Base Rent for the Twelve Months Ended December 31, 2013 (b) (000's)		Average Annualized Rental Rate as of December 31, 2013 (c)
210 Lake Drive East		Cherry Hill	NJ	1986	60,604	72.2	%	461		22.48
308 Harper Drive		Moorestown	NJ	1976	59,500	83.3	%	560		18.67
305 Fellowship Drive		Mt. Laurel	NJ	1980	56,824	83.7	%	323		10.53
309 Fellowship Drive		Mt. Laurel	NJ	1982	55,911	89.6	%	739		22.04
307 Fellowship Drive		Mt. Laurel	NJ	1981	54,485	68.6	%	397		18.91
303 Fellowship Drive		Mt. Laurel	NJ	1979	53,768	75.1	%	489		18.39
1000 Bishops Gate		Mt. Laurel	NJ	2005	53,281	100.0	%	1,023		23.72
2 Foster Avenue	(f)	Gibbsboro	NJ	1974	50,761	100.0	%	220		4.43
4000 Midlantic Drive		Mt. Laurel	NJ	1998	46,945	100.0	%	601		20.48
Five Eves Drive		Marlton	NJ	1986	45,564	97.8	%	688		21.38
161 Gaither Drive		Mount Laurel	NJ	1987	44,739	79.5	%	490		22.30
Main Street - Piazza		Voorhees	NJ	1990	44,708	100.0	%	617		21.37
20 East Clementon Road		Gibbsboro	NJ	1986	38,260	93.5	%	419		19.59
Two Eves Drive		Marlton	NJ	1987	37,532	96.7	%	383		17.23
Main Street - Promenade		Voorhees	NJ	1988	31,445	97.1	%	266		12.55
Four B Eves Drive		Marlton	NJ	1987	27,011	83.3	%	363		18.02
815 East Gate Drive		Mt. Laurel	NJ	1986	25,500	100.0	%	218		15.98
817 East Gate Drive		Mt. Laurel	NJ	1986	25,351	60.0	%	258		12.22
Four A Eves Drive		Marlton	NJ	1987	24,687	69.8	%	236		16.52
1 Foster Avenue	(f)	Gibbsboro	NJ	1972	24,255	100.0	%	111		4.58
4 Foster Avenue	(f)	Gibbsboro	NJ	1974	23,372	100.0	%	164		7.81
7 Foster Avenue		Gibbsboro	NJ	1983	22,158	100.0	%	177		12.86
10 Foster Avenue		Gibbsboro	NJ	1983	18,651	95.7	%	193		17.50
5 U.S. Avenue	(f)	Gibbsboro	NJ	1987	5,000	100.0	%	32		6.00
50 East Clementon Road		Gibbsboro	NJ	1986	3,080	100.0	%	160		51.90
5 Foster Avenue		Gibbsboro	NJ	1968	2,000	100.0	%	—		—
SUBTOTAL - NEW JERSEY/DELAWARE SEGMENT					3,139,721	87.9	%	$	39,291	$	19.86
RICHMOND, VA SEGMENT
300 Arboretum Place		Richmond	VA	1988	212,228	90.2	%	$	3,234	$	17.86
6800 Paragon Place		Richmond	VA	1986	145,647	82.6	%	1,881		15.43
6802 Paragon Place		Richmond	VA	1989	143,788	98.3	%	2,487		17.60
7501 Boulders View Drive		Richmond	VA	1990	136,654	100.0	%	2,115		16.99
2511 Brittons Hill Road	(f)	Richmond	VA	1987	132,548	100.0	%	659		6.67
2100-2116 West Laburnam Avenue		Richmond	VA	1976	128,337	95.2	%	1,676		14.76
7300 Beaufont Springs Drive		Richmond	VA	2000	120,665	100.0	%	1,646		20.39
1025 Boulders Parkway		Richmond	VA	1994	93,143	74.5	%	1,159		16.03
2201-2245 Tomlynn Street	(f)	Richmond	VA	1989	85,861	97.2	%	433		6.60
7401 Beaufont Springs Drive		Richmond	VA	1998	82,732	82.5	%	931		13.92
7325 Beaufont Springs Drive		Richmond	VA	1999	75,218	54.6	%	747		20.96
100 Gateway Centre Parkway		Richmond	VA	2001	74,991	77.3	%	521		11.38
6806 Paragon Place		Richmond	VA	2007	74,480	100.0	%	1,613		20.51
9011 Arboretum Parkway		Richmond	VA	1991	73,183	65.0	%	652		13.81
4870 Sadler Road		Glen Allen	VA	2000	63,832	96.0	%	1,368		21.75
4880 Sadler Road		Glen Allen	VA	1998	63,427	100.0	%	1,280		20.28
4805 Lake Brooke Drive		Glen Allen	VA	1996	60,867	63.5	%	533		4.87
9100 Arboretum Parkway		Richmond	VA	1988	58,446	93.4	%	748		14.29
2812 Emerywood Parkway		Henrico	VA	1980	56,984	97.5	%	870		15.34
4364 South Alston Avenue		Durham	NC	1985	56,601	60.0	%	576		17.39
2277 Dabney Road	(f)	Richmond	VA	1986	50,400	100.0	%	313		8.05
9200 Arboretum Parkway		Richmond	VA	1988	49,542	89.7	%	716		16.86
9210 Arboretum Parkway		Richmond	VA	1988	48,012	74.5	%	425		14.67
2212-2224 Tomlynn Street	(f)	Richmond	VA	1985	45,353	100.0	%	334		9.28

32

		Location	State	Year Built/ Renovated	Net Rentable Square Feet	Percentage Leased as of December 31, 2013 (a)		Total Base Rent for the Twelve Months Ended December 31, 2013 (b) (000's)		Average Annualized Rental Rate as of December 31, 2013 (c)
2221-2245 Dabney Road	(f)	Richmond	VA	1994	45,250	100.0	%	248		8.00
2251 Dabney Road	(f)	Richmond	VA	1983	42,000	100.0	%	238		7.37
2161-2179 Tomlynn Street	(f)	Richmond	VA	1985	41,550	100.0	%	246		8.25
2256 Dabney Road	(f)	Richmond	VA	1982	33,413	100.0	%	217		9.13
2246 Dabney Road	(f)	Richmond	VA	1987	33,271	100.0	%	272		10.13
2244 Dabney Road	(f)	Richmond	VA	1993	33,050	100.0	%	269		9.94
9211 Arboretum Parkway		Richmond	VA	1991	30,791	100.0	%	338		13.73
2248 Dabney Road	(f)	Richmond	VA	1989	30,184	100.0	%	200		6.85
2130-2146 Tomlynn Street	(f)	Richmond	VA	1988	29,700	100.0	%	211		8.96
2120 Tomlyn Street	(f)	Richmond	VA	1986	23,850	86.2	%	131		8.82
2240 Dabney Road	(f)	Richmond	VA	1984	15,389	100.0	%	125		14.64
SUBTOTAL - RICHMOND, VA SEGMENT					2,491,387	90.1	%	$	29,412	$	14.16
AUSTIN, TX SEGMENT
11305 Four Points Drive		Austin	TX	1,984	192,396	100	%	80		19.71
SUBTOTAL - AUSTIN, TX SEGMENT					192,396	99.8	%	80		26.65
CALIFORNIA SEGMENT
155 Grand Avenue		Oakland	CA	1990	204,336	86.4	%	$	4,793	$	32.79
2 Kaiser Land	(g)	Oakland	CA	N/A	—	—	%	—		—
Oakland Lot B	(g)	Oakland	CA	N/A	—	—	%	—		—
1220 Concord Avenue		Concord	CA	1984	175,153	100.0	%	4,204		25.07
1200 Concord Avenue		Concord	CA	1984	175,103	100	%	4,409		26.37
5900 & 5950 La Place Court		Carlsbad	CA	1988	80,506	82.8	%	1,158		15.12
5963 La Place Court		Carlsbad	CA	1987	61,587	78.3	%	886		18.53
2035 Corte Del Nogal		Carlsbad	CA	1991	53,982	73.8	%	713		20.71
SUBTOTAL - CALIFORNIA SEGMENT					750,667	92.7	%	$	16,163	$	24.16
TOTAL CORE PORTFOLIO					23,973,578	91.8	%	$	417,599	24.05

(a) Calculated by dividing net rentable square feet included in leases signed on or before December 31, 2013 at the property by the aggregate net rentable square feet of the property.

(b) “Total Base Rent” for the twelve months ended December 31, 2013 represents base rents earned during such period, excluding tenant reimbursements, parking income, tenant inducements and deferred market rent adjustments, calculated in accordance with generally accepted accounting principles (GAAP) determined on a straight-line basis.

(c) “Average Annualized Rental Rate” is calculated by taking: (i) for office leases written on a triple net basis, the sum of the annualized base rent utilizing contractual rental rates pursuant to executed leases as of December 31, 2013 exclusive of concessions and abatements plus the prorata 2013 budgeted operating expense reimbursements excluding tenant electricity; and (ii) for office leases written on a full service basis, the annualized base rent utilizing contractual rental rates pursuant to executed leases as of December 31, 2013 exclusive of concessions and abatements, and dividing the sum of such amounts by the total square footage occupied as of December 31, 2013.

(d) These properties are subject to a ground lease with a third party.

(e) We hold our interest in Two Logan Square (100 North 18th Street) through our ownership of second and third mortgages that are secured by this property and that are junior to a first mortgage held by a third party lender. Our ownership of these two mortgages currently provides us with all of the cash flows from Two Logan Square after the payment of operating expenses and debt service on the first mortgage.

(f) These properties are industrial facilities.

(g) These are mixed-use properties.

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(h) We contributed this property to an unconsolidated real estate venture. However, we continue to consolidate this property due to our continuing involvement resulting from our ongoing lease of space, and our 50% ownership interest in the real estate venture.

(i) This is a 220-space parking garage facility.

The following table shows information regarding rental rates and lease expirations for the Properties at December 31, 2013 and assumes that none of the tenants exercises renewal options or termination rights, if any, at or prior to scheduled expirations:

Year of Lease Expiration December 31,	Number of Leases Expiring Within the Year	Rentable Square Footage Subject to Expiring Leases	Final Annualized Base Rent Under Expiring Leases (a)		Final Annualized Base Rent Per Square Foot Expiring Leases		Percentage of Total Final Annualized Base Rent Under Expiring Leases		Cumulative Total
2013 (b)	31	46,524	$	902,202	$	19.39	0.2	%	0.2	%
2014	245	1,516,728	34,171,771		22.53		6.0	%	6.2	%
2015	247	2,323,785	48,985,940		21.08		8.6	%	14.8	%
2016	232	1,842,151	43,772,047		23.76		7.7	%	22.5	%
2017	237	2,889,363	76,314,172		26.41		13.4	%	35.9	%
2018	207	2,823,893	78,115,221		27.66		13.7	%	49.6	%
2019	139	1,530,888	46,326,191		30.26		8.1	%	57.7	%
2020	85	1,619,665	44,802,402		27.66		7.9	%	65.6	%
2021	48	1,062,627	30,298,305		28.51		5.3	%	70.9	%
2022	38	1,601,503	48,306,345		30.16		8.5	%	79.4	%
2023	39	622,756	18,387,699		29.53		3.2	%	82.6	%
2024 and thereafter	46	3,567,627	98,358,765		27.57		17.4	%	100.0	%
	1,594	21,447,510	$	568,741,060	$	26.52	100.0	%

(a) “Final Annualized Base Rent” for each lease scheduled to expire represents the cash rental rate of base rents, excluding tenant reimbursements, in the final month prior to expiration multiplied by 12. Tenant reimbursements generally include payment of a portion of real estate taxes, operating expenses and common area maintenance and utility charges.

(b) Relates to existing month-to-month tenancy leases and to expired leases, which converted to month-to-month tenancies until a written notice to vacate is provided by us or until a new lease agreement is agreed upon with the tenant.

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At December 31, 2013, our Properties were leased to 1,376 tenants that are engaged in a variety of businesses. The following table sets forth information regarding leases at the Properties with the 20 tenants having the largest amounts of space leased based upon Annualized Base Rent as of December 31, 2013:

Tenant Name (a)	Number of Leases	Weighted Average Remaining Lease Term Months	Aggregate Leased Square Feet	Aggregate Leased Square Feet			Annualized Base Rent (in 000) (b)		Percentage of Aggregate Annualized Base Rent
General Services Administration — U.S. Govt.	15	168	1,550,382	7.2	%		$	34,672	7.0	%
Northrop Grumman Corporation	4	42	431,033	2.0	%		13,544		2.7	%
Pepper Hamilton LLP	2	138	339,923	1.6	%		11,528		2.3	%
Wells Fargo Bank, N.A.	10	41	423,028	2.0	%		11,005		2.2	%
KPMG, LLP	2	100	241,828	1.1	%		8,310		1.7	%
Comcast Corporation	4	53	354,469	1.7	%		8,245		1.7	%
Dechert LLP	1	70	218,565	1.0	%		7,651		1.6	%
Lockheed Martin	7	30	441,281	2.1	%		7,223		1.5	%
Lincoln National Management Co.	1	91	198,079	0.9	%		6,753		1.4	%
PricewaterhouseCoopers LLP	1	139	237,221	1.1	%		6,698		1.4	%
Blank Rome LLP	1	97	236,903	1.1	%		6,393		1.3	%
Drinker Biddle & Reath LLP	1	144	209,584	1.0	%		6,070		1.2	%
Macquarie US	1	79	223,355	1.0	%		6,016		1.2	%
Verizon	6	58	229,699	1.1	%		5,950		1.2	%
Deltek Systems, Inc.	1	104	157,900	0.7	%		5,529		1.1	%
Janney Montgomery Scott, LLC	3	165	160,544	0.7	%	445	4,452		0.9	%
AT&T	7	63	121,803	0.6	%		4,062		0.8	%
Executive Health Resources, Inc.	4	36	197,618	0.9	%		4,047		0.8	%
Marsh & McLennan Companies, Inc.	2	125	112,278	0.5	%		4,040		0.8	%
VWR Management Services LLC	1	132	149,858	0.7	%		3,955		0.8	%
Consolidated Total/Weighted Average	74	55	6,235,351	29.0	%		$	166,143	33.6	%

(a) The identified tenant includes affiliates in certain circumstances.

(b) Annualized Base Rent represents the monthly base rent, excluding tenant reimbursements, for each lease in effect at December 31, 2013 multiplied by 12. Tenant reimbursements generally include payment of a portion of real estate taxes, operating expenses and common area maintenance and utility charges.

Real Estate Ventures

As of December 31, 2013, we had an aggregate net investment of approximately $180.5 million in 17 unconsolidated Real Estate Ventures. We formed or acquired interests in these Real Estate Ventures with unaffiliated third parties to develop or manage office properties or to acquire land in anticipation of possible development of office or residential properties. As of December 31, 2013, 11 of the real estate ventures owned 55 office buildings that contain an aggregate of approximately 5.7 million net rentable square feet; two real estate ventures owned 3.8 acres of undeveloped parcels of land; three real estate ventures owned 22.5 acres of land under active development; and one real estate venture owned a hotel property that contains 137 rooms in Conshohocken, PA.

As indicated in Note 4, "Investment in Unconsolidated Real Estate Ventures," to our consolidated financial statements, during 2013 we also held interests in five former real estate ventures that had a $2.9 million net impact to the "Equity in income of real estate ventures" line of our consolidated income statement for the year ended December 31, 2013.

We account for our investments in these Real Estate Ventures using the equity method. Our ownership interests range from 20% to 65%, subject to specified priority allocations in certain of the Real Estate Ventures. Our investments, initially recorded at cost, are subsequently adjusted for our share of the Real Estate Ventures’ income or loss and contributions to capital and distributions, unless we have no intent or obligation to fund losses in which case our investment would not go below zero.

As of December 31, 2013, we have provide guarantees on behalf of certain of the real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment

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guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures we have provided and expect to continue to provide cost overrun and completion guarantees, with rights of contribution among partners in the venture, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements.

Austin Venture

On October 16, 2013, we contributed a portfolio of seven office properties containing an aggregate of 1,398,826 square feet located in Austin, Texas (the "Austin Properties") to a newly-formed unconsolidated real estate venture (the "Austin Venture") that we formed with G&I VII Austin Office LLC (“DRA”), an investment vehicle unaffiliated with us and advised by DRA Advisors LLC. The Austin Properties and related assets represent our entire remaining property portfolio within the Austin, Texas region, with the exception of Four Points Centre which was acquired in December 2013. DRA and the Company, based on arm's-length negotiation, agreed to an aggregate gross sales price of $330.0 million subject to an obligation on the Company's part to fund the first $5.2 million of post-closing capital expenditures, of which $0.8 million had been funded by us through December 31, 2013.

We and DRA each own a 50% interest in the Austin Venture, subject to our right to receive up to an additional 10% of distributions.

Upon its formation, the Austin Venture obtained third party non-recourse debt financing of approximately $230.6 million secured by mortgages on the Austin Properties and used proceeds of this financing together with $49.7 million of cash contributed to the Austin Venture by DRA (less $1.9 million of closing costs and $6.9 million of closing prorations and lender holdbacks) to fund a $271.5 million distribution to us. We have agreed to fund the first $5.2 million of post-closing capital expenditures on behalf of the Austin Venture, resulting in net proceeds to us of $266.3 million after funding our capital expenditure obligation. As part of the transaction, our subsidiary management company executed an agreement with the Austin Venture to provide property management and leasing services to the Austin Venture in exchange for a market-based fee.

We, along with DRA intend to jointly pursue additional office opportunities in targeted Austin sub-markets and plan to co-invest in acquisitions that meet certain investment criteria utilizing additional equity funding of up to $100.0 million per partner and to-be-determined third-party debt financing.

4040 Wilson Venture

On July 31, 2013, we formed 4040 Wilson LLC Venture ("4040 Wilson"), as a joint venture between us and Ashton Park Associates LLC (“Ashton Park”), an unaffiliated third party. We and Ashton Park each owns a 50% interest in 4040 Wilson. 4040 Wilson expects to construct a 426,900 square foot office building representing the final phase of the eight building, mixed-use, Liberty Center complex developed by the parent company of Ashton Park in the Ballston submarket of Arlington, Virginia. 4040 Wilson expects to develop the office building on a 1.3 acre land parcel contributed by Ashton Park to 4040 Wilson at an agreed upon valuation of $36.0 million. The total estimated project costs are $194.1 million, which we expect will be financed through approximately $72.0 million of partner capital contributions (consisting of $36.0 million in cash from the Company and land with a value of $36.0 million from Ashton Park) and approximately $125.1 million of debt financing through a construction lender that has not yet been determined. We expect groundbreaking to commence upon achievement of certain of pre-leasing levels, at which point 4040 Wilson would expect to obtain debt financing for a portion of the project costs.

In our joint venture agreement with Ashton Park, we agreed to guarantee 100% of any lender mandated recourse. As of December 31, 2013, we had no outstanding guarantees related to 4040 Wilson.

Two and Six Tower Bridge Exchange Transaction

On June 19, 2013, we acquired an unaffiliated third party's ownership interest in Six Tower Bridge, an office property containing 116,174 net rentable square feet in Conshohocken, Pennsylvania. Prior to the June 2013 acquisition, we had a 63% ownership interest in the real estate venture that held title to this property. We acquired full ownership of Six Tower Bridge by exchanging our entire ownership interest in a separate real estate venture that held title to Two Tower Bridge, an office property also in Conshohocken, Pennsylvania for the remaining 37% ownership interest in Six Tower Bridge. Please see Note 4, "Investment in Unconsolidated Real Estate Ventures," to our consolidated financial statements for further discussion.

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evo at Cira Centre South Venture (formerly the Grove Venture)

On January 25, 2013, we formed the HSRE-Campus Crest IX Real Estate Venture ("evo at Cira"), a joint venture among the Company and two unaffiliated third parties: Campus Crest Properties, LLC ("Campus Crest") and HSRE-Campus Crest IXA, LLC ("HSRE"). evo at Cira has commenced construction of a 33-story, 850-bed student housing tower located in the University City submarket of Philadelphia, Pennsylvania. The project is targeted for completion during the third quarter of 2014. We and Campus Crest each own a 30% interest in the evo at Cira and HSRE owns a 40% interest. evo at Cira is developing the project on a one-acre land parcel held under a long-term ground lease with the University of Pennsylvania, as ground lessor. We contributed to evo at Cira our tenancy rights under the long-term ground lease, together with associated development rights, at an agreed-upon value of $8.5 million. The total estimated project costs are $158.5 million, which are being financed through partner capital contributions totaling $60.7 million, and through $97.8 million of secured debt construction financing provided by PNC Bank, Capital One, and First Niagara Bank. We and Campus Crest have each provided, in addition to customary non-recourse carve-out guarantees, a completion and cost overrun guaranty, as well as a payment guaranty, on the construction financing (with the share of the payment guaranty for each of us and Campus Crest being approximately $24.7 million). As of December 31, 2013, we have funded 100% of our share of the anticipated equity contributions. Construction has already commenced, with a targeted project completion in 2014.

BDN Beacon Venture

On March 26, 2013, we sold our entire 20% ownership interest in an unconsolidated real estate venture known as BDN Beacon Venture LLC (the "Beacon Venture"). The carrying amount of our investment in the Beacon Venture amounted to $17.0 million at the sale date, with our proceeds effectively matching the carrying amount.

Item 3.    Legal Proceedings

We are involved from time to time in legal proceedings, including tenant disputes, employee disputes, disputes arising out of agreements to purchase or sell properties and disputes relating to state and local taxes. We generally consider these disputes to be routine to the conduct of our business and management believes that the final outcome of such proceedings will not have a material adverse effect on our financial position, results of operations or liquidity.

Item 4.    Mine Safety Disclosures

Not applicable.

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PART II

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

The common shares of Brandywine Realty Trust are traded on the New York Stock Exchange (“NYSE”) under the symbol “BDN.” There is no established trading market for units of partnership interests in the Operating Partnership. On February 20, 2014, there were 660 holders of record of our common shares and 35 holders of record (in addition to Brandywine Realty Trust) of Class A units of the Operating Partnership. On February 20, 2014, the last reported sales price of the common shares on the NYSE was $14.44. The following table sets forth the quarterly high and low sales price per common share reported on the NYSE for the indicated periods and the distributions paid by us with respect to each such period.

	Share Price High		Share Price Low		Distributions Paid During Quarter
First Quarter 2012	$	11.48	$	9.40	$	0.15
Second Quarter 2012	$	12.34	$	10.66	$	0.15
Third Quarter 2012	$	12.88	$	11.28	$	0.15
Fourth Quarter 2012	$	12.66	$	11.07	$	0.15
First Quarter 2013	$	14.85	$	12.18	$	0.15
Second Quarter 2013	$	15.94	$	12.61	$	0.15
Third Quarter 2013	$	14.56	$	12.45	$	0.15
Fourth Quarter 2013	$	14.35	$	12.67	$	0.15

For each quarter in 2013 and 2012, the Operating Partnership paid a cash distribution per Class A unit in an amount equal to the dividend paid on a common share for each such quarter.

In order to maintain the status of Brandywine Realty Trust as a REIT, we must make annual distributions to shareholders of at least 90% of our taxable income (not including net capital gains). Future distributions will be declared at the discretion of our Board of Trustees and will depend on our actual cash flow, financial condition and capital requirements, the annual distribution requirements under the REIT provisions of the Internal Revenue Code and such other factors as our Board of Trustees deems relevant.

On December 10, 2013, our Board of Trustees declared a quarterly dividend distribution of $0.15 per common share that was paid on January 21, 2014. On December 11, 2012, our Board of Trustees declared a quarterly dividend distribution of $0.15 per common share that was paid on January 18, 2013. Our Board of Trustees has adopted a dividend policy designed such that our distributions to our projected, normalized taxable income for 2014.

The following table provides information as of December 31, 2013, with respect to compensation plans (including individual compensation arrangements) under which our common shares are authorized for issuance:

	(a)	(b)		(c)
Plan category	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))
Equity compensation plans approved by security holders (1)	2,983,569	$	15.50	5,195,177
Equity compensation plans not approved by security holders	—	—		—
Total	2,983,569	$	15.50	5,195,177

(1) Relates to our Amended and Restated 1997 Long-Term Incentive Plan (the “1997 Plan”) and 46,667 options awarded prior to adoption of the 1997 Plan. Under the 1997 Plan, as amended, the number of common shares remaining available for awards

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under the 1997 Plan was 5,195,177 as of December 31, 2013 (of which 3,600,000 were available solely for awards of options and share appreciation rights).

There were no common share repurchases under our repurchase program during the fiscal quarter ended December 31, 2013. The number of common shares remaining available for repurchase under our share repurchase program as of December 31, 2013 was 539,200.

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SHARE PERFORMANCE GRAPH

The SEC requires us to present a chart comparing the cumulative total shareholder return on the common shares with the cumulative total shareholder return of (i) a broad equity index and (ii) a published industry or peer group index. The following chart compares the cumulative total shareholder return for the common shares with the cumulative shareholder return of companies on (i) the S&P 500 Index (ii) the Russell 2000 and (iii) the NAREIT ALL-REIT Total Return Index as provided by NAREIT for the period beginning December 31, 2008 and ending December 31, 2013 and assumes an investment of $100, with reinvestment of all dividends, has been made in the common shares and in each index on December 31, 2008.

	Year Ended
Index	12/31/2008	12/31/2009	12/31/2010	12/31/2011	12/31/2012	12/31/2013
Brandywine Realty Trust	100.00	163.00	175.42	151.68	205.28	248.14
S&P 500	100.00	126.46	145.51	148.59	172.37	228.19
Russell 2000	100.00	127.17	161.32	154.59	179.86	249.69
NAREIT All Equity REIT Index	100.00	127.99	163.76	177.32	212.26	218.32

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Item 6. Selected Financial Data

The following table sets forth selected financial and operating data and should be read in conjunction with the financial statements and related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in this Annual Report on Form 10-K. The selected data have been revised to reflect disposition of all properties since January 1, 2009, which have been reclassified as discontinued operations for all periods presented in accordance with the accounting standard governing discontinued operations.

Brandywine Realty Trust

(in thousands, except per common share data and number of properties)

Year Ended December 31,	2013			2012			2011			2010			2009
Operating Results
Total revenue	$	562,210		$	535,679		$	538,568		$	516,280		$	526,378
Income (loss) from continuing operations	38,982			(37,309		)	(24,556		)	(43,000		)	(8,916		)
Net income (loss)	43,189			6,529			(4,715		)	(17,606		)	8,089
Income (loss) allocated to Common Shares	35,514			(8,238		)	(12,996		)	(25,578		)	(245		)
Income (loss) from continuing operations per Common Share
Basic	$	0.20		$	(0.36	)	$	(0.24	)	$	(0.38	)	$	(0.15	)
Diluted	$	0.20		$	(0.36	)	$	(0.24	)	$	(0.38	)	$	(0.15	)
Earnings (loss) per Common Share
Basic	$	0.23		$	(0.06	)	$	(0.10	)	$	(0.19	)	$	—
Diluted	$	0.23		$	(0.06	)	$	(0.10	)	$	(0.19	)	$	—
Cash distributions paid per Common Share	$	0.60		$	0.60		$	0.60		$	0.60		$	0.60
Balance Sheet Data
Real estate investments, net of accumulated depreciation	$	3,853,006		$	3,922,893		$	4,061,461		$	4,201,410		$	4,164,992
Total assets	4,765,095			4,506,709			4,557,718			4,690,378			4,663,750
Total indebtedness	2,595,381			2,465,330			2,393,995			2,430,446			2,454,577
Total liabilities	2,843,660			2,733,193			2,668,022			2,712,604			2,742,010
Noncontrolling interest	21,215			21,238			33,105			128,272			38,308
Brandywine Realty Trust’s equity	1,900,220			1,752,278			1,856,591			1,849,502			1,883,432
Other Data
Cash flows from:
Operating activities	$	183,484		$	159,110		$	177,247		$	185,127		$	220,405
Investing activities	104,708			(74,864		)	(46,163		)	(171,936		)	(102,549		)
Financing activities	(26,534		)	(83,107		)	(147,239		)	1,807			(120,213		)
Property Data
Number of properties owned at year end	204			221			232			233			245
Net rentable square feet owned at year end	24,765			25,079			25,221			25,633			25,563

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Brandywine Operating Partnership, L.P.

(in thousands, except per common partnership unit data and number of properties)

Year Ended December 31,	2013			2012			2011			2010			2009
Operating Results
Total revenue	$	562,210		$	535,679		$	538,568		$	516.28		$	526,378
Loss from continuing operations	38,982			(37,309		)	(24,556		)	(43,000		)	(8,916		)
Net income (loss)	43,189			6,529			(4,715		)	(17,606		)	8,089
Loss from continuing operations per Common Partnership Unit
Basic	$	0.20		$	(0.36	)	$	(0.23	)	$	(0.37	)	$	(0.15	)
Diluted	$	0.20		$	(0.36	)	$	(0.23	)	$	(0.37	)	$	(0.15	)
Earnings (loss) per Common Partnership Units
Basic	$	0.23		$	(0.06	)	$	(0.09	)	$	(0.19	)	$	—
Diluted	$	0.23		$	(0.06	)	$	(0.09	)	$	(0.19	)	$	—
Cash distributions paid per Common Partnership Unit	$	0.60		$	0.60		$	0.60		$	0.60		$	0.60
Balance Sheet Data
Real estate investments, net of accumulated depreciation	$	3,853,006		$	3,922,893		$	4,061,461		$	4,201,410		$	4,164,992
Total assets	4,765,095			4,506,709			4,557,718			4,690,378			4,657,320
Total indebtedness	2,595,381			2,465,330			2,393,995			2,430,446			2,454,577
Total liabilities	2,843,660			2,733,193			2,668,022			2,712,604			2,742,010
Redeemable limited partnership units	26,486			26,777			38,370			132,855			44,620
Non-controlling interest	—			—			—			—			65
Brandywine Operating Partnership’s equity	1,894,003			1,746,739			1,851,326			1,844,919			1,871,155
Other Data
Cash flows from:
Operating activities	$	183,484		$	159,110		$	177,247		$	185,127		$	220,405
Investing activities	104,708			(74,864		)	(46,163		)	(171,936		)	(102,549		)
Financing activities	(26,534		)	(83,107		)	(147,239		)	1,807			(120,213		)
Property Data
Number of properties owned at year end	204			221			232			233			245
Net rentable square feet owned at year end	24,765			25,079			25,221			25,663			25,563

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

The following discussion should be read in conjunction with the consolidated financial statements appearing elsewhere herein and is based primarily on our consolidated financial statements for the years ended December 31, 2013, 2012 and 2011.

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OVERVIEW

We are a self-administered and self-managed REIT that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office, mixed-use and industrial properties. As of December 31, 2013, we owned 204 properties that contain an aggregate of approximately 24.8 million net rentable square feet and consist of 176 office properties, 19 industrial facilities, five mixed-use properties, one development property, two redevelopment properties, and one re-entitlement property (collectively, the “Properties”). In addition, as of December 31, 2013, we owned economic interests in 17 unconsolidated real estate ventures which own properties that contain approximately 5.7 million net rentable square feet (collectively, the “Real Estate Ventures”). As of December 31, 2013, we also owned 432 acres of undeveloped land, and held options to purchase approximately 51 additional acres of undeveloped land. As of December 31, 2013, the total potential development that these land parcels could support under current zoning, entitlements or combination thereof, amounted to 6.8 million square feet. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord, and Carlsbad, California. In addition to managing properties that we own, as of December 31, 2013, we were managing approximately 7.9 million net rentable square feet of office and industrial properties for third parties and the Real Estate Ventures. Unless otherwise indicated, all references in this Form 10-K to square feet represent net rentable area. We do not have any foreign operations and our business is not seasonal. Our operations are not dependent on a single tenant or a few tenants and no single tenant accounted for more than 10% of our total 2013 revenue.

During the year ended December 31, 2013, we were managing our portfolio within seven segments: (1) Pennsylvania Suburbs, (2) Philadelphia CBD, (3) Metropolitan Washington D.C., (4) New Jersey/Delaware, (5) Richmond, Virginia, (6) Austin, Texas and (7) California/Other. The Pennsylvania Suburbs segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. The Metropolitan Washington, D.C. segment includes properties in Northern Virginia and southern Maryland. The New Jersey/Delaware segment includes properties in Burlington and Camden counties in New Jersey and in New Castle county in the state of Delaware. The Richmond, Virginia segment includes properties primarily in Albemarle, Chesterfield, Goochland and Henrico counties and one property in Durham, North Carolina. The Austin, Texas segment includes properties in Austin. On October 16, 2013, we contributed seven properties within the Austin portfolio to a newly formed real estate venture. After contributing these properties, we wholly owned one property in Austin, Texas. For additional information, see Item 1. Business - 2013 Transactions. The California segment includes properties in Oakland, Concord, and Carlsbad. Our corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions.

We generate cash and revenue from leases of space at our properties and, to a lesser extent, from the management of properties owned by third parties and from investments in the Real Estate Ventures. Factors that we evaluate when leasing space include rental rates, costs of tenant improvements, tenant creditworthiness, current and expected operating costs, the length of the lease, vacancy levels and demand for office and industrial space. We also generate cash through sales of assets, including assets that we do not view as core to our portfolio, either because of location or expected growth potential, and assets that are commanding premium prices from third party investors.

Factors that May Influence Future Results of Operations

Global Market and Economic Conditions

In the U.S., market and economic conditions have been improving, characterized by more availability to credit and modest growth. While recent economic data reflects modest growth, the cost and availability of credit may be adversely affected by illiquid credit markets and wider credit spreads. Volatility in the U.S. and international markets and economies may adversely affect our liquidity and financial condition, and the liquidity and financial condition of our tenants. The continuance of these market conditions may limit our ability, as well as the ability of our tenants, to timely refinance maturing liabilities and access capital markets to meet liquidity needs.

Real Estate Asset Valuation

General economic conditions and the resulting impact on market conditions or a downturn in tenants’ businesses may adversely affect the value of our assets. Challenging economic conditions in the U.S., declining demand for leased office, mixed use, or industrial properties and/or a decrease in market rental rates and/or market values of real estate assets in our submarkets could have a negative impact on the value of our properties and related tenant improvements. If we were required under GAAP to write down the carrying value of any of our properties to the lower of cost or fair value due to impairment, or if as a result of an early lease termination we were required to remove or dispose of material amounts of tenant improvements that are not reusable to another tenant, our financial condition and results of operations could be negatively affected.

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Leasing Activity and Rental Rates

The amount of net rental income generated by our properties depends principally on our ability to maintain the occupancy rates of currently leased space and to lease currently available space, newly developed or redeveloped properties and space available from unscheduled lease terminations. The amount of rental income we generate also depends on our ability to maintain or increase rental rates in our submarkets. Negative trends in one or more of these factors could adversely affect our rental income in future periods.

Development and Redevelopment Programs

Historically, a significant portion of our growth has come from our development and redevelopment efforts. We have a proactive planning process by which we continually evaluate the size, timing, costs and scope of our development and redevelopment programs and, as necessary, scale activity to reflect the economic conditions and the real estate fundamentals that exist in our strategic submarkets. We are currently proceeding on certain development and redevelopment projects, and we take a cautious and selective approach when determining if a certain development or redevelopment project will benefit our portfolio.

In addition, we may be unable to lease committed development or redevelopment properties at expected rental rates or within projected timeframes or complete development or redevelopment properties on schedule or within budgeted amounts, which could adversely affect our financial condition, results of operations and cash flow.

Financial and Operating Performance

Our financial and operating performance is dependent upon the demand for office, industrial and other commercial space in our markets, our leasing results, our acquisition, disposition and development activity, our financing activity, our cash requirements and economic and market conditions, including prevailing interest rates.

Adverse changes in economic conditions could result in a reduction of the availability of financing and potentially in higher borrowing costs. These factors, coupled with an ongoing economic recovery, have reduced the volume of real estate transactions and created credit stresses on some businesses. Vacancy rates may increase, and rental rates may decline, through 2014 and possibly beyond as the current economic climate may negatively impacts tenants.

Overall economic conditions, including but not limited to high unemployment and deteriorating financial and credit markets, could have a dampening effect on the fundamentals of our business, including increases in past due accounts, tenant defaults, lower occupancy and reduced effective rents. These conditions would negatively affect our future net income and cash flows and could have a material adverse effect on our financial condition. We believe that the quality of our assets and our strong balance sheet will enable us to raise debt capital, if necessary, in various forms and from different sources, including traditional term or secured loans from banks, pension funds and life insurance companies. However, there can be no assurance that we will be able to borrow funds on terms that are economically attractive or at all.

We continued to seek revenue growth in fiscal year 2013 by increasing occupancy and rental rates. Occupancy at our wholly owned properties at December 31, 2013 was 89.5%, compared to 88.3% at December 31, 2012.

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The table below summarizes selected operating and leasing statistics of our wholly owned operating properties for the year ended December 31, 2013:

	Year ended
	December 31, 2013
Leasing Activity:
Total net rentable square feet owned (1)	23,973,578
Occupancy percentage (end of period)	89.5	%
Average occupancy percentage	88.0	%
New leases and expansions commenced (square feet)	1,753,986
Leases renewed (square feet)	1,589,504
Net absorption (square feet) (2)	289,271
Percentage change in rental rates per square feet (3)
New and expansion rental rates	7.1	%
Renewal rental rates	8.6	%
Combined rental rates	8.1	%
Capital Costs Committed (4)
Leasing commissions (per square feet)	$3.38
Tenant Improvements (per square feet)	$8.60
(1) For each period, includes all properties in the core portfolio (i.e. not under development or redevelopment), including properties that were sold during these periods.
(2) Includes leasing related to completed developments and redevelopments, as well as sold properties.
(3) Rental rates include base rent plus reimbursement for operating expenses and real estate taxes.
(4) Calculated on an average basis.

In seeking to increase revenue through our operating, financing and investment activities, we also seek to minimize operating risks, including (i) tenant rollover risk, (ii) tenant credit risk and (iii) development risk.

Tenant Rollover Risk:

We are subject to the risks that tenant leases, upon expiration, are not renewed, that space may not be relet; and that the terms of renewal or reletting (including the cost of renovations) may be less favorable to us than the current lease terms. Leases that accounted for approximately 6.2% of our aggregate final annualized base rents as of December 31, 2013 (representing approximately 6.5% of the net rentable square feet of the properties) are scheduled to expire without penalty in 2014. We maintain an active dialogue with our tenants in an effort to maximize lease renewals. Our retention rate for leases that were scheduled to expire in 2013 was 68.3% compared to retention rate of 66.2% for leases that expired in 2012. Rental rates on leases expiring during 2013 did not deviate significantly from market renewal rates in the regions in which we operate. If we are unable to renew leases or relet space under expiring leases, at anticipated rental rates, or if tenants terminate their leases early, our cash flow would be adversely impacted.

Tenant Credit Risk:

In the event of a tenant default, we may experience delays in enforcing our rights as a landlord and may incur substantial costs in protecting our investment. Our management regularly evaluates our accounts receivable reserve policy in light of our tenant base and general and local economic conditions. Our accounts receivable allowance was $16.2 million or 10.3% of total receivables (including accrued rent receivable) as of December 31, 2013 compared to $16.6 million or 10.9% of total receivables (including accrued rent receivable) as of December 31, 2012.

If economic conditions persist or deteriorate further, we may experience increases in past due accounts, defaults, lower occupancy and reduced effective rents. This condition would negatively affect our future net income and cash flows and could have a material adverse effect on our financial condition.

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Development Risk:

On October 31, 2013 we determined to proceed with development of the Cira Walnut Tower ("Cira Walnut"), which we currently contemplate as a 47-story office and residential tower at 30^th and Walnut Streets in Philadelphia on a site ground leased from the University of Pennsylvania. We currently expect Cira Walnut to be ready for initial occupancy during the second quarter of 2016 and to include approximately 575,000 square feet of office space, 245,000 square feet of residential space consisting of 260 market rate finished and unfinished rental apartment units, and 10,000 square feet of retail space, with an additional floor containing a full range of amenities.

To reduce development risk, we have pre-leased an aggregate of 61% of the office square feet of Cira Walnut.  The anchor tenant for approximately 253,000 square feet of office space is FMC Corporation, a diversified chemical company serving agricultural, consumer and industrial markets globally.  The lease with FMC has an initial term of sixteen (16) years from initial occupancy. In addition, we also pre-leased approximately 100,000 square feet of office space to the University of Pennsylvania under a 20-year lease lease.  Cira Walnut will be known as The FMC Tower at Cira Centre South.

We anticipate that the office component of the project will cost approximately $236.0 million with the residential component costing approximately $105.0 million for a total project cost of $341.0 million and intend to fund the Cira Walnut development costs through a combination of existing cash balances, capital raised through one or more joint venture formations, proceeds from additional asset sales or equity and debt financing including third party equity sources.

Our current intention is to either joint venture or pre-sell the residential component of the FMC Tower at Cira Centre South. Pursuant to this objective, we have executed a non-binding letter of intent with a residential development and operating company that contemplates either outcome.

Our ground lease with the University of Pennsylvania has a term through July 2097, with a variable rent that would provide the University with a percentage of the cash flow or proceeds of specified capital events subject to receipt of a priority return on the Operating Partnership's investment.

Development projects are subject to a variety of risks, including construction delays, construction cost overruns, inability to obtain financing on favorable terms, inability to lease space at projected rates, inability to enter into construction, development and other agreements on favorable terms, and unexpected environmental and other hazards. See Item 1A - Risk Factors.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Management’s Discussion and Analysis of Financial Condition and Results of Operations discuss our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the reporting periods. Certain accounting policies are considered to be critical accounting policies, as they require management to make assumptions about matters that are highly uncertain at the time the estimate is made and changes in the accounting estimate are reasonably likely to occur from period to period. Management believes the following critical accounting policies reflect our more significant judgments and estimates used in the preparation of our consolidated financial statements. For a summary of all of our significant accounting policies, see Note 2 to our consolidated financial statements included elsewhere in this report.

Revenue Recognition

We recognize rental revenue on the straight-line basis from the later of the date of the commencement of the lease or the date of acquisition of the property subject to existing leases, which averages minimum rents over the terms of the leases. Lease incentives, which are included as reductions of rental revenue are recognized on a straight-line basis over the term of the lease.

Our leases also typically provide for tenant reimbursement of a portion of common area maintenance expenses and other operating expenses to the extent that a tenant’s pro rata share of expenses exceeds a base year level set in the lease or to the extent that the tenant has a lease on a triple net basis. For certain leases, we make significant assumptions and judgments in determining the lease term, including assumptions when the lease provides the tenant with an early termination option. The lease term impacts the period over which we determine and record minimum rents and also impacts the period over which we amortize lease-related costs.

In addition, our rental revenue is impacted by our determination of whether improvements to our properties, whether made by us or by the tenant, are landlord assets. The determination of whether an improvement is a landlord asset requires judgment. In making this judgment, our primary consideration is whether the improvement would be utilizable by another tenant upon move

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out of the improved space by the then-existing tenant. If we have funded an improvement that we determine not to be landlord assets, then we treat the costs of the improvement as lease incentives. If the tenant has funded the improvement that we determine to be landlord assets, then we treat the costs of the improvement as deferred revenue and amortize this cost into revenue over the lease term.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance expenses, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred.

Tenant reimbursements are recognized and presented in accordance with accounting guidance which requires that these reimbursements be recorded on a gross basis because we are generally the primary obligor with respect to the goods and services the purchase of which gives rise to the reimbursement obligation; because we have discretion in selecting the vendors and suppliers; and because we bear the credit risk in the event they do not reimburse us. We also receive payments from third parties for reimbursement of a portion of the payroll and payroll-related costs for certain of our personnel allocated to perform services for these third parties and we reflect these payments on a gross basis.

We recognize gains on sales of real estate at times and in amounts determined in accordance with the accounting guidance for sales of real estate. The guidance takes into account the terms of the transaction and any continuing involvement, including in the form of management, leasing of space or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, then we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery method, as appropriate, until the sales criteria are met

We derive parking revenues from leases, monthly parking and transient parking. We recognize parking revenue as earned.

We receive management and development fees from third parties.

Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. We record development fees as earned taking into account the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

Real Estate Investments

Real estate investments are carried at cost. We record acquisition of real estate investments treated as business combinations under the acquisition method of accounting and allocate the purchase price to land, buildings and intangible assets on a relative fair value basis. Depreciation is computed using the straight-line method over the useful lives of buildings and capital improvements (5 to 55 years) and over the shorter of the lease term or the life of the asset for tenant improvements. Direct construction costs related to the development of Properties and land holdings are capitalized as incurred. Capitalized costs include pre-construction costs essential to the development of the property, development and constructions costs, interest, property taxes, insurance, salaries and other project costs during the period of development. Estimates and judgments are required in determining when capitalization of certain costs such as interest should commence and cease. We expense routine repair and maintenance expenditures and capitalize those items that extend the useful lives of the underlying assets.

Real Estate Ventures

When we obtain an economic interest in an entity, we evaluate the entity to determine if the entity is deemed a variable interest entity (“VIE”), and if we are deemed to be the primary beneficiary, in accordance with the accounting standard for the consolidation of variable interest entities. This accounting standard requires significant use of judgments and estimates in determining its application. If the entity is not deemed to be a VIE, and we serve as the general partner or managing member within the entity, we evaluate to determine if our presumed control as the general partner or managing member is overcome by the “kick out” rights and other substantive participating rights of the limited partners or non-managing members in accordance with the same accounting standard.

We consolidate (i) entities that are VIEs and of which we are deemed to be the primary beneficiary and (ii) entities that are non-VIEs which we control. Entities that we account for under the equity method (i.e., at cost, increased or decreased by our share of earnings or losses, less distributions) include (i) entities that are VIEs and of which we are not deemed the primary beneficiary (ii) entities that are non-VIEs which we do not control, but over which we have the ability to exercise significant influence and (iii) entities that are non-VIEs which we maintain an ownership interest through our general partner status, but in which the limited partners in the entity have the substantive ability to dissolve the entity or remove us without cause or have substantive participating rights. We continuously assess our determination of whether an entity is a VIE and who the primary beneficiary is, and whether

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or not the limited partners in an entity have substantive rights, including if certain events occur that are likely to cause a change in original determinations.

On a periodic basis, management assesses whether there are any indicators that the value of our investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the fair value of the investment. Our estimates of value for each investment (particularly in commercial real estate joint ventures) are based on a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. These factors are difficult to predict and are subject to future events that may alter management’s assumptions; accordingly, the values estimated by management in its impairment analyses may not be realized.

Impairment or Disposal of Long-Lived Assets

We review our long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. In such case, an impairment loss is recognized in the amount of the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our holding strategy were to change or if market conditions were to otherwise dictate an earlier sale date, then an impairment loss may be recognized and such loss could be material. If we determine that impairment has occurred, the affected assets must be reduced to their fair value.

The relevant accounting guidance for impairments requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and if we will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). We generally consider assets to be “held for sale” when the transaction has been approved by our Board of Trustees, or by officers vested with authority to approve the transaction and there are no known significant contingencies relating to the sale of the property within one year of the consideration date and the consummation of the transaction is otherwise considered probable.

Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value.

We determined during our impairment review of the years-ended December 31, 2013 and 2012, that no impairment charges were necessary.

Income Taxes

Parent Company

The Parent Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). In addition, the Parent Company may elect to treat one or more of its subsidiaries as REITs. In order to continue to qualify as a REIT, the Parent Company and each of its REIT subsidiaries are required to, among other things, distribute at least 90% of their REIT taxable income to their stockholders and meet certain tests regarding the nature of their income and assets. As REITs, the Parent Company and its REIT subsidiaries are not subject to federal income tax with respect to the portion of their income that meets certain criteria and is distributed annually to the stockholders. Accordingly, no provision for federal income taxes is included in the accompanying consolidated financial statements with respect to the operations of these REITs. The Parent Company and its REIT subsidiaries, if any, intend to continue to operate in a manner that allows them to continue to meet the requirements for taxation as REITs. Many of these requirements, however, are highly technical and complex. If the Parent Company or one of its REIT subsidiaries were to fail to meet these requirements, they would be subject to federal income tax.

The Parent Company may elect to treat one or more of its subsidiaries as a taxable REIT subsidiary, or TRS. In general, a TRS may perform additional services for our tenants and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the provision to any person, under a

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franchise, license or otherwise, of rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The Parent Company has elected to treat certain of its corporate subsidiaries as TRSs; these entities provide third party property management services and certain services to tenants that could not otherwise be provided.

Operating Partnership

In general, the Operating Partnership is not subject to federal and state income taxes, and accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements. The partners of the Operating Partnership are required to include their respective share of the Operating Partnership’s profits or losses in their respective tax returns. The Operating Partnership’s tax returns and the amount of allocable Partnership profits and losses are subject to examination by federal and state taxing authorities. If such examination results in changes to the Operating Partnership profits or losses, then the tax liability of the partners would be changed accordingly.

The Operating Partnership may elect to treat one or several of its subsidiaries as REITs under Sections 856 through 860 of the Internal Revenue Code. Each subsidiary REIT has met or intends to meet the requirements for treatment as a REIT under Sections 856 through 860 of the Internal Revenue Code, and, accordingly, no provision has been made for federal and state income taxes in the accompanying consolidated financial statements. If any subsidiary REIT fails to qualify as a REIT in any taxable year, that subsidiary REIT will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent taxable years. Also, each subsidiary REIT may be subject to certain local income taxes.

The Operating Partnership has elected to treat several of its subsidiaries as TRSs, which are subject to federal, state and local income tax.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts that represents an estimate of losses that may be incurred from the inability of tenants to make required payments. The allowance is an estimate based on two calculations that are combined to determine the total amount reserved. First, we evaluate specific accounts where we have determined that a tenant may have an inability to meet its financial obligations. In these situations, we use our judgment, based on the facts and circumstances, and record a specific reserve for that tenant against amounts due to reduce the receivable to the amount that we expect to collect. These reserves are re-evaluated and adjusted as additional information becomes available. Second, a reserve is established for all tenants based on a range of percentages applied to receivable aging categories. If the financial condition of our tenants were to deteriorate, additional allowances may be required. For accrued rent receivables, we consider the results of the evaluation of specific accounts as well as other factors including assigning risk factors to different industries based on our tenants' standard industrial classification. Considering various factors including assigning a risk factor to different industries, these percentages are based on historical collection and write-off experience adjusted for current market conditions.

Deferred Costs

We incur direct costs related to the financing, development and leasing of our properties. Management exercises judgment in determining whether such costs, particularly internal costs, meet the criteria for capitalization or must be expensed. Capitalized financing fees are amortized over the related loan term on a basis that approximates the effective interest method while capitalized leasing costs are amortized over the related lease term. Management re-evaluates the remaining useful lives of leasing costs as the creditworthiness of our tenants and economic and market conditions change.

Purchase Price Allocation

We allocate the purchase price of properties to net tangible and identified intangible assets acquired based on fair values. Above-market and below-market in-place lease values for acquired properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) our estimate of the fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancellable term of the lease (includes the below market fixed renewal period, if applicable). Capitalized above-market lease values are amortized as a reduction of rental income over the remaining non-cancellable terms of the respective leases. Capitalized below-market lease values are amortized as an increase of rental income over the remaining non-cancellable terms of the respective leases, including any fixed-rate renewal periods.

Other intangible assets also include amounts representing the value of tenant relationships and in-place leases based on our evaluation of the specific characteristics of each tenant’s lease and our overall relationship with the respective tenant. We estimate the cost to execute leases with terms similar to the remaining lease terms of the in-place leases, include leasing commissions, legal

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and other related expenses. This intangible asset is amortized to expense over the remaining term of the respective leases and any fixed-rate bargain renewal periods. We estimate fair value through methods similar to those used by independent appraisers or by using independent appraisals. Factors that we consider in our analysis include an estimate of the carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. We also consider information obtained about each property as a result of our pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired. In estimating carrying costs, we include real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, which primarily range from four to twelve months.

Characteristics that we consider in allocating value to our tenant relationships include the nature and extent of our business relationship with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The value of tenant relationship intangibles is amortized over the remaining initial lease term and expected renewals, but in no event longer than the remaining depreciable life of the building. The value of in-place leases is amortized over the remaining non-cancellable term of the respective leases and any fixed-rate renewal periods.

In the event that a tenant terminates its lease at or prior to the end of the lease term, the unamortized portion of each intangible, including market rate adjustments, in-place lease values and tenant relationship values, would be charged to expense.

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RESULTS OF OPERATIONS

The following discussion is based on our Consolidated Financial Statements for the years ended December 31, 2013, 2012 and 2011. We believe that presentation of our consolidated financial information, without a breakdown by segment, will effectively present important information useful to our investors.

Net operating income (“NOI”) as presented in the comparative analysis below is defined as

revenue less property operating expenses, real estate taxes and third party management expenses. Property operating expenses that are included in determining NOI consist of costs that are necessary and allocable to our operating properties such as utilities, property-level salaries, repairs and maintenance, property insurance, management fees and bad debt expense. General and administrative expenses that are not reflected in NOI primarily consist of corporate-level salaries, amortization of share awards and professional fees that are incurred as part of corporate office management. NOI is a non-GAAP financial measure that we use internally to evaluate the operating performance of our real estate assets by segment, as presented in Note 18 to the consolidated financial statements, and of our business as a whole. We believe NOI provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. While NOI is a relevant and widely used measure of operating performance of real estate investment trusts, it does not represent cash flow from operations or net income as defined by GAAP and should not be considered as an alternative to those measures in evaluating our liquidity or operating performance. NOI also does not reflect general and administrative expenses, interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. Trends in development and construction activities that could materially impact our results from operations are also not included in NOI. We believe that net income, as defined by GAAP, is the most appropriate earnings measure. See Note 18 to the Consolidated Financial Statements for a reconciliation of NOI to our consolidated net income (loss).

Comparison of the Year Ended December 31, 2013 to the Year Ended December 31, 2012

The table below shows selected operating information for the “Same Store Property Portfolio” and the “Total Portfolio.” The Same Store Property Portfolio consists of 196 properties containing an aggregate of approximately 21.8 million net rentable square feet, and represents properties that we owned for the twelve-month periods ended December 31, 2013 and 2012. The Same Store Property Portfolio includes properties acquired or placed in service on or prior to January 1, 2012 and owned through December 31, 2013. The Total Portfolio includes the effects of other properties that were either placed into service, acquired or redeveloped after January 1, 2011 or disposed prior to December 31, 2012. A property is excluded from our Same Store Property Portfolio and moved into the redevelopment column in the period that we determine that a redevelopment would be the best use of the asset, and when said asset is taken out of service or is undergoing re-entitlement for a future development strategy. This table also includes a reconciliation from the Same Store Property Portfolio to the Total Portfolio net income (i.e., all properties owned by us during the twelve-month periods ended December 31, 2013 and 2012) by providing information for the properties which were acquired, placed into service, under development or redevelopment and administrative/elimination information for the twelve-month periods ended December 31, 2013 and 2012 (in thousands).

The Total Portfolio net income presented in the table is equal to the net income of the Parent Company and the Operating Partnership.

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Comparison of Year Ended December 31, 2013 to the Year Ended December 31, 2012

	Same Store Property Portfolio									Recently Completed Properties (a)					Development Properties (b)						Other (Eliminations) (c)						Total Portfolio
(dollars in thousands)	2013			2012			Increase/ (Decrease)			2013			2012		2013			2012			2013			2012			2013			2012			Increase/ (Decrease)
Revenue:
Cash rents	$	407,422		$	392,528		$	14,894		$	2,833		$	—	$	9,095		$	1,095		$	14,834		$	15,531		$	434,184		$	409,154		$	25,030
Straight-line rents	17,195			20,209			(3,014		)	280			—		2,580			757			(18		)	1,283			20,037			22,249			(2,212		)
Above/below market rent amortization	5,765			5,865			(100		)	48			—		991			81			362			211			7,166			6,157			1,009
Total rents	430,382			418,602			11,780			3,161			—		12,666			1,933			15,178			17,025			461,387			437,560			23,827
Tenant reimbursements	64,195			63,616			579			280			—		1,821			921			12,791			12,523			79,087			77,060			2,027
Termination fees	4,497			3,182			1,315			—			—		—			—			—			51			4,497			3,233			1,264
Third party management fees, labor reimbursement and leasing	—			—			—			—			—		—			—			13,053			12,116			13,053			12,116			937
Other	2,898			5,317			(2,419		)	1			—		176			12			1,111			381			4,186			5,710			(1,524		)
Total revenue	501,972			490,717			11,255			3,442			—		14,663			2,866			42,133			42,096			562,210			535,679			26,531
Property operating expenses	152,868			151,007			1,861			1,120			—		5,662			1,508			756			(196		)	160,406			152,319			8,087
Real estate taxes	47,431			46,814			617			440			—		1,935			682			5,806			5,906			55,612			53,402			2,210
Third party management expenses	—			—			—			—			—		—			—			5,751			5,127			5,751			5,127			624
Net operating income	301,673			292,896			8,777			1,882			—		7,066			676			29,820			31,259			340,441			324,831			15,610
General & administrative expenses	—			2			(2		)	301			—		1			96			27,326			25,315			27,628			25,413			2,215
Depreciation and amortization	173,561			175,989			(2,428		)	1,385			—		7,386			1,069			14,689			11,324			197,021			188,382			8,639
Operating income (loss)	$	128,112		$	116,905		$	11,207		$	196		$	—	$	(321	)	$	(489	)	$	(12,195	)	$	(5,380	)	$	115,792		$	111,036		$	4,756
Number of properties	196			196						4					4												204
Square feet	21,769			21,769						2,205					1,366												25,340
Core Occupancy % (d)	89.6		%	87.7		%				87.8		%			N/A												89.5		%
Other Income (Expense):
Interest income																											1,044			3,008			(1,964		)
Historic tax credit transaction income																											11,853			11,840			13
Interest expense																											(121,937		)	(132,939		)	11,002
Interest expense — Deferred financing costs																											(4,676		)	(6,208		)	1,532
Recognized hedge activity																											—			(2,985		)	2,985
Interest expense —Financing obligation																											(972		)	(850		)	(122		)
Equity in income of real estate ventures																											3,664			2,741			923
Net gain from remeasurement of investments in real estate ventures																											6,866			—			6,866
Net gain (loss) on real estate venture transactions																											29,604			(950		)	30,554
Net loss on sale of undepreciated real estate																											(137		)	—			(137		)
Loss on early extinguishment of debt																											(2,119		)	(22,002		)	19,883
Income (loss) from continuing operations																											38,982			(37,309		)	76,291
Income from discontinued operations																											4,207			43,838			(39,631		)
Net income																											$	43,189		$	6,529		$	36,660
Net income (loss) per common share																											$	0.23		$	(0.06	)	$	0.29

EXPLANATORY NOTES

(a) Results include: Four assets completed/acquired and placed in service.

(b) Results include: One development, two redevelopments and one re-entitlement property

(c) Represents certain revenues and expenses at the corporate level as well as various intercompany costs that are eliminated in consolidation and third-party management fees. This also includes seven properties that were contributed to an unconsolidated real estate venture in which the Company has a 50% ownership interest.

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(d) Pertains to properties that are part of our core portfolio (i.e. not under development, redevelopment, or re-entitlement).

Total Revenue

Cash rents from the Total Portfolio increased by $25.0 million from 2012 to 2013 primarily reflecting the following

• $14.9 million increase in rental income at our same store properties which is a result of 190 basis points increase in occupancy and a 100 basis point increase in cash rental rates from 2012 to 2013;

• an increase of $8.0 million at our development properties related to the acquisition of 1900 Market Street during the fourth quarter of 2012 and a portion of 660 Germantown Pike which was placed into service subsequent to the fourth quarter of 2012;

• an increase of $2.8 million related to the acquisition of One and Two Commerce Square during December of 2013 and Six Tower Bridge during the second quarter of 2013;

This increase is offset by a decrease of $0.7 million as a result of contributing our Austin portfolio to a joint venture during the fourth quarter of 2013.

Straight-line rents decreased by $2.2 million from 2012 to 2013, as a result of the following: a decrease of $3.0 million at our same store properties as a result of free rent turning to cash rent subsequent to the fourth quarter of 2012 and $1.3 million related to the contribution of our Austin portfolio into a joint venture during the fourth quarter of 2013. This decrease was offset by $1.8 million related to increases in straight line rent earned at our development properties and increases of $0.3 million related to the acquisitions discussed above.

Tenant reimbursements increased$2.0 million from 2012 to 2013 as a direct result of the $10.3 million increase in operating expenses over the same period. Please see the Property Operating Expenses and Real Estate Taxes explanations below and note that certain costs, such as snow removal costs, carry a higher tenant reimbursement percentage.

Termination fees at our Total Portfolio increased by $1.3 million due to timing and volume of tenant move-outs during 2013 when compared to 2012.

Other income at our Total Portfolio decreased by $1.5 million during 2013 compared to 2012 as a result of real estate tax refunds received related to prior year's tax assessment appeals.

Property Operating Expenses

Property operating expenses across our total portfolioincreasedby$8.1 millionfrom 2012 to 2013, mainly attributable to the following: (i) an increase of $4.2 million as a result of acquiring1900 Market Street, Six Tower Bridge, Commerce Square and Four Points Centre as discussed above, (ii) an increase of $1.1 million related to our development properties that were placed into service during 2013, (iii) an increase in repairs and maintenance expenses of $2.6 million, directly attributable the timing of tenant needs, (iv) an increase in snow removal costs of $0.7 million as a result of more severe winter experienced in our Pennsylvania and New Jersey submarkets, (v) an increase in bad debt expense of $0.7 million, and (vi) an increase in payroll expense of $0.6 million. These increases were offset by lower utility costs of $1.7 million.

Real Estate Taxes

Real estate taxes across our total portfolio increased by $2.2 million, primarily as a result of acquiring 1900 Market Street, Six Tower Bridge, One and Two Commerce Square and Four Points Centre as discussed above.

General and Administrative Expenses

General and administrative expenses increased by $2.2 million from 2012 to 2013, mainly attributable to a $1.2 million increase in expenditures related to the acquisition activity discussed above. Stock compensation expense increased $0.8 million due to the fact that we accelerated the amortization of such compensation of our executive personnel meeting qualifying retirement provisions. Salary and benefits expense increased $0.7 million in 2013. These increases were offset by a $0.5 million decrease in professional fees and miscellaneous general and administrative expenses.

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Depreciation and Amortization

Depreciation and amortization expense increased by $8.6 million, mainly attributable to the four property acquisitions discussed above. In addition, we also accelerated depreciation expense related to Plaza 1000 at Main Street. We are in the process of re-entitling this property for residential and mixed-use development, and accordingly, we shortened the lives of the buildings and related assets to the estimated demolition date. In addition, a portion of 660 Germantown Pike was placed into service subsequent to 2012 resulting in additional depreciation expense during 2013.

Interest Income

Interest income decreased by $2.0 million from 2012 to 2013 primarily due to the recognition of $1.0 million of accrued interest income related to the payoff of the Trenton note receivable during 2012. The remaining decrease is due to a decrease in interest income earned on investments in available-for-sale securities that were outstanding during 2012. Interest income earned during 2013 primarily represents interest earned on our available cash balances ($263.2 million as of December 31, 2013).

Interest Expense

The decrease in interest expense of $11.0 million is primarily due to the following:

• a decrease of $14.3 million as a result of the repurchases of debt subsequent to the third quarter of 2012, including (i) $19.8 million of our 5.400% Guaranteed Notes due 2014, (ii) $69.7 million of our 7.500% Guaranteed Notes due 2015, (iii) $100.1 million of our 6.000% Guaranteed Notes due 2016; and (iv) $150.0 million of term loan indebtedness;

• a decrease of $4.7 million in mortgage interest expense which is directly related to the $60.0 million decrease resulting from the repayment of two mortgage loans during the fourth quarter of 2012;

• a decrease of $2.1 million related to our $151.5 million 5.400% Guaranteed Notes that matured and were repaid in full during April 2012; and,

• an increase of $0.6 million in capitalized interest resulting in a decrease in interest expense.

The decrease of $21.7 million in interest expense described above was offset by an increase of $10.7 million, of which $9.7 million related to interest on our $250.0 million 3.950% Guaranteed Notes due 2023 issued in the fourth quarter of 2012 and $1.0 million relates to borrowings made during the first quarter of 2012 consisting of $250.0 million of 6.000% Guaranteed Notes due 2016, $150.0 million under the LIBOR + 1.750% Three-year Term Loan and $200.0 million under the LIBOR + 1.900% Seven-year Term Loan.

Interest Expense - Deferred Financing Costs

Deferred financing costs decreased$1.5 million during 2013 compared to 2012 mainly due to the write-off of costs related to repurchases of debt during 2012, which included, (i) $19.8 million of our 5.400% Guaranteed Notes due 2014, (ii) $69.7 million of our 7.500% Guaranteed Notes due 2015, and (iii) $100.1 million of our 6.000% Guaranteed Notes due 2016, and (iv) $150.0 million of term loan indebtedness.

Recognized Hedge Activity

Recognized hedge activity decreased$3.0 million during 2013 due to the recognition of $3.0 million of early termination fees related to the termination of interest rate swap contracts. The interest rate swap contracts were terminated in connection with the repayment of our $150.0 million fixed portion of our four-year term loan due February 1, 2016 during the fourth quarter of 2012 (see Note 7 of the notes to the consolidated financial statements for further details of these transactions). There were no comparable charges incurred during 2013.

Net Gain on Remeasurement of Investments in Real Estate Ventures

The net gain on remeasurement of investments in real estate ventures was $6.9 million during 2013 with no comparable gains recognized during 2012. These net gains resulted from the Company taking control of Six Tower Bridge and One and Two Commerce Square during 2013 which required the remeasurement at fair value of our existing equity interest in each partnership. See Footnote 3 and Footnote 4 of our consolidated financial statements.

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Net Gain on Real Estate Venture Transactions

The $30.6 million increase in gain on real estate venture transactions is a result of the Company contributing seven properties to the newly-formed Austin Venture and recognizing a $25.9 million gain on sale during 2013. Additionally, a $3.7 million increase in gain on real estate venture transactions is the result of the exchange of our remaining ownership in the Two Tower Bridge Venture for the remaining ownership interest in the Six Tower Bridge Venture, as discussed above and in Footnote 4 of our consolidated financial statements.

Loss on real estate venture formation of $1.0 million incurred during 2012 was a result of our termination of an agreement with a third party broker that was entered into upon contributing two properties into a joint venture during December 2011. During the third quarter of 2012, we determined that it was in our best interest to terminate the contract in order to avoid additional commissions and fees on the future joint venture acquisitions, recognizing the fee as an additional cost of forming the real estate venture.

Loss on Early Extinguishment of Debt

During 2013, we repurchased (i) $0.5 million of our 6.000% Guaranteed Notes due 2016, (ii) $9.9 million of our 7.500% Guaranteed Notes due 2015, and (iii) $20.8 million of our 5.400% Guaranteed Notes due 2014, which resulted in a net loss on early extinguishment of debt of $2.1 million.

During 2012, we repurchased (i) $150.0 million of term loan indebtedness, (ii) $99.6 million of our 6.000% Guaranteed Notes due 2016, (iii) $60.8 million of our 7.500% Guaranteed Notes due 2015, (iv) $4.3 million of our 5.400% Guaranteed Notes due 2014, and (v) $0.3 million of our 5.750% Guaranteed Notes due 2012, which resulted in a net loss on early extinguishment of debt of $21.9 million. In addition, we prepaid the remaining balances on two of our existing mortgages, totaling $58.4 million, for which we incurred associated prepayment penalties of $0.1 million.

Discontinued Operations

During 2013, we sold a portfolio of eight office properties located in Lawrenceville, New Jersey, one property located in San Diego, California, one property located in Carlsbad, California, one property located in Malvern, Pennsylvania one property located in Exton, Pennsylvania, one property located in King of Prussia, Pennsylvania, and one property in West Chester, Pennsylvania. These properties had total revenues of $5.2 million, property operating expenses of $2.5 million and $1.9 million of depreciation and amortization expense. We recognized a net gain on sale related to these transactions of $3.4 million.

During 2012, we sold one property located in Moorestown, New Jersey, one property located in Herndon, Virginia, one property located in Carlsbad, California, and 11 flex/office properties located in Exton, Pennsylvania. 2012 discontinued operations were also reclassified for the properties sold during 2013. These properties had total revenues of $31.4 million, property operating expenses of $12.2 million, and $10.2 million of depreciation and amortization expense. In addition, we recognized a deferred gain related to two properties located in Trenton, New Jersey that were sold during the fourth quarter of 2009. The gain was deferred as a result of a note receivable that we held from the buyer in the amount of $22.5 million. The note receivable and accrued interest was paid in full during the second quarter of 2012, prior to its maturity date of October 2016. We recognized a net gain on sale related to these transactions of $34.8 million during 2012.

Net Income

Net income increased by $36.7 million from 2012 to 2013 as a result of the factors described above. Net income is significantly impacted by depreciation of operating properties and amortization of acquired intangibles. These non-cash charges do not directly affect our ability to pay dividends. Amortization of acquired intangibles will continue over the related lease terms or estimated duration of the tenant relationships.

Earnings per Common Share

Net income per share was $0.23 during 2013 as compared to net loss per share of $0.06 during 2012 as a result of the factors described above.

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RESULTS OF OPERATIONS

Comparison of the Year Ended December 31, 2012 to the Year Ended December 31, 2011

The table below shows selected operating information for the “Same Store Property Portfolio” and the “Total Portfolio.” After giving consideration to property sales through December 31, 2013 the Same Store Property Portfolio consists of 191 properties containing an aggregate of approximately 21.4 million net rentable square feet that we owned for the entire twelve-month periods ended December 31, 2012 and 2011. The Same Store Property Portfolio includes properties acquired or placed in service on or prior to January 1, 2011 and owned through December 31, 2012. The Total Portfolio includes the effects of other properties that were either placed into service, acquired or redeveloped after January 1, 2011 or disposed of prior to December 31, 2012. A property is excluded from our Same Store Property Portfolio and moved into the redevelopment column in the period that we determine that a redevelopment would be the best use of the asset, and when said asset is taken out of service or is undergoing re-entitlement for a future development strategy. This table also includes a reconciliation from the Same Store Property Portfolio to the Total Portfolio net income (i.e., all properties owned by us during the twelve-month periods ended December 31, 2012 and 2011) by providing information for the properties which were acquired, under development (including lease-up assets) or placed into service and administrative/elimination information for the twelve-month periods ended December 31, 2012 and 2011 (in thousands).

The Total Portfolio net income presented in the table is equal to the net income of the Parent Company and the Operating Partnership.

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Comparison of Year Ended December 31, 2012 to the Year Ended December 31, 2011

	Same Store Property Portfolio									Recently Completed Properties						Development Properties						Other (Eliminations) (a)						Total Portfolio
(dollars in thousands)	2012			2011			Increase/ (Decrease)			2012			2011			2012			2011			2012			2011			2012			2011			Increase/ (Decrease)
Revenue:
Cash rents	$	387,207		$	387,600		$	(393	)	$	5,326		$	2,945		$	1,309		$	1,002		$	15,311		$	26,818		$	409,153		$	418,365		$	(9,212	)
Straight-line rents	19,384			15,369			4,015			825			370			765			46			1,275			1,804			22,249			17,589			4,660
Above/below market rent amortization	5,379			5,174			205			486			156			82			—			211			45			6,158			5,375			783
Total rents	411,970			408,143			3,827			6,637			3,471			2,156			1,048			16,797			28,667			437,560			441,329			(3,769		)
Tenant reimbursements	62,918			64,336			(1,418		)	702			309			998			1,007			12,442			11,752			77,060			77,404			(344		)
Termination fees	3,182			2,951			231			—			—			—			—			51			—			3,233			2,951			282
Third party management fees, labor reimbursement and leasing	—			—			—			—			—			—			—			12,116			11,536			12,116			11,536			580
Other	5,289			3,249			2,040			28			14			12			60			381			2,025			5,710			5,348			362
Total revenue	483,359			478,679			4,680			7,367			3,794			3,166			2,115			41,787			53,980			535,679			538,568			(2,889		)
Property operating expenses	147,991			154,093			(6,102		)	3,018			1,565			1,765			1,898			(455		)	2,212			152,319			159,768			(7,449		)
Real estate taxes	46,558			44,756			1,802			257			206			799			591			5,788			5,880			53,402			51,433			1,969
Third party management expenses	—			—			—			—			—			—			—			5,127			5,590			5,127			5,590			(463		)
Net Operating Income	288,810			279,830			8,980			4,092			2,023			602			(374		)	31,327			40,298			324,831			321,777			3,054
General & administrative expenses	(12		)	74			(86		)	150			538			96			—			25,179			23,990			25,413			24,602			811
Depreciation and amortization	172,392			178,950			(6,558		)	3,741			1,850			1,284			856			10,965			21,277			188,382			202,933			(14,551		)
Operating Income (loss)	$	116,430		$	100,806		$	15,624		$	201		$	(365	)	$	(778	)	$	(1,230	)	$	(4,817	)	$	(4,969	)	$	111,036		$	94,242		$	16,794
Number of properties	191			191						5						4												200			200
Square feet	21,398			21,398						369																		22,607
Core Occupancy % (b)	87.9		%	86.0		%				77.9		%																86.7		%
Other Income (Expense):
Interest income																												3,008			1,810			1,198
Historic tax credit transaction income																												11,840			12,026			(186		)
Interest expense																												(132,939		)	(131,405		)	(1,534		)
Interest expense — Deferred financing costs																												(6,208		)	(4,991		)	(1,217		)
Recognized hedge activity																												(2,985		)	—			(2,985		)
Interest expense — Financing Obligation																												(850		)	—			(850		)
Equity in income of real estate ventures																												2,741			3,775			(1,034		)
Net gain on sale of interests in real estate																												—			2,985			(2,985		)
Loss on real estate venture formation																												(950		)	(222		)	(728		)
Loss on early extinguishment of debt																												(22,002		)	(2,776		)	(19,226		)
Loss from continuing operations																												$	(37,309	)	$	(24,556	)	$	(12,753	)
Income from discontinued operations																												43,838			19,841			23,997
Net income (loss)																												$	6,529		$	(4,715	)	$	11,244
Loss per common share																												$	(0.06	)	$	(0.10	)	$	0.04

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EXPLANATORY NOTES

(a) Results include: Five assets placed in service and one acquired property.

(b) Results include: Two redevelopments and two re-entitlement properties.

(c) Represents certain revenues and expenses at the corporate level as well as various intercompany costs that are eliminated in consolidation and third-party management fees. This also includes nine properties that were contributed to two unconsolidated real estate ventures in which the Company has a 50% ownership interest in each venture.

(d) Pertains to properties that are part of our core portfolio (i.e. not under development, redevelopment, or re-entitlement).

Total Revenue

Cash rents from the Total Portfolio decreased by $9.2 million from 2011 to 2012 primarily reflecting a decrease of $11.5 million of rental income as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011.

This decrease was offset by:

• an increase of $2.4 million due to an increase related to the placement into service of the Juniper Street Garage and 660 Allendale Road during the third quarter of 2011, the acquisition of 3020 Market Street during the third quarter of 2011, and the acquisition of 7000 West at Lantana during the fourth quarter of 2012, and;

• an increase of $0.3 million related to the redevelopment of 660 West Germantown Pike and 1900 Market Street during 2012.

Straight-line rents increased by $4.7 million from 2011 to 2012, consistent with the factors described above: an increase of $4.0 million due to an increase in same store occupancy of 190 basis points from 2011 to 2012, as well as a $0.5 million increase related to the acquisitions of the operating properties described above and an increase of $0.7 million due to the placement in service of the above mentioned redevelopment properties. This increase was offset by $0.5 million as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011.

Tenant reimbursements decreased by $0.3 million from 2011 to 2012 as a direct result of the $5.5 million decrease in operating expenses over the same period. Please see the Property Operating Expenses explanations below and note that certain costs, such as snow removal costs, carry a higher tenant reimbursement percentage.

Termination fees at our Total Portfolio increased by $0.3 million due to timing and volume of tenant move-outs during 2012 when compared to 2011.

Other income at our Total Portfolio increased by $0.4 million during 2012 compared to 2011 as a result of real estate tax refunds received related to prior year's tax assessment appeals.

Property Operating Expenses

Property operating expenses at the Total Portfolio decreased by $7.4 million from 2011 to 2012, mainly attributable to the following: (i) a decrease of $3.0 million in snow removal costs as a result of the mild winter experienced in our Pennsylvania and New Jersey submarkets during 2012 as compared to 2011, (ii) a decrease of $2.8 million related to lower utility costs, (iii) a decrease of $2.4 million as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011, (iv) a decrease of $1.7 million in repairs and maintenance expenses, directly attributable to timing and tenant needs, and (v) a decrease of $1.0 million in contracted janitorial and landscaping expenses as a result of entering into contracts at more favorable rates during 2012 as compared to 2011. These decreases were offset by: (i) an increase of $1.5 million in salaries, bonuses and related benefits from 2011 to 2012, (ii) an increase of $1.5 million due to the acquisition or placement in service of certain properties throughout 2011 and 2012, as mentioned above, and (iii) an increase of $0.5 million in state and local taxes during 2012, consistent with an increase in tax rates during the year.

Real Estate Taxes

Real estate taxes increased by $2.0 million primarily as a result of an increase in real estate tax rates across our portfolio during 2012 compared to 2011 of 3.0 million. The increase was offset by a $1.0 million decrease in real estate tax expenses for the two properties contributed to an unconsolidated real estate venture in 2011.

58

General & Administrative Expenses

General and Administrative Expense increased by $0.8 million from 2011 to 2012, mainly attributable to an increase in the amortization of performance-based compensation of $1.2 million. This increase is due to the fact that we accelerated the amortization of such compensation subsequent to certain of our executive personnel meeting qualifying retirement conditions during 2012, causing their associated performance-based compensation to fully vest (please refer to Footnote 14 of the notes to the consolidated financial statements for further discussion). This increase is offset by a decrease in acquisition costs of $0.4 million from 2011 to 2012.

Depreciation and Amortization

Depreciation and amortization expense decreased by $14.6 million, mainly attributable to a decrease of $6.7 million as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011. During 2011, we also recorded a $4.7 million out-of-period adjustment for intangible assets representing tenant relationships and in-place leases that should have been written-off in prior years. The remaining decreases are due to decreases related to asset write-offs related to early move-outs and fully amortized assets in 2012, without comparable expenses in 2011. These decreases were offset by an increase of $3.7 million related to the additional depreciation and amortization expense from the aforementioned properties that we acquired, placed into service, or redeveloped during 2012.

Interest Income

Interest income increased by $1.2 million primarily due to the recognition of $1.0 million of accrued interest income related to the payoff of the Trenton note receivable during 2012. The installment sale method was used to account for the transaction as a result of the note receivable, and therefore interest income is recognized on a cash basis. We recognized all of the interest income accrued to date during 2012 upon receipt of payment from the borrower. See "Discontinued Operations" section below.

Interest Expense

The decrease in interest expense of $1.5 million is primarily due to the following:

• an increase of $11.4 million as a result of the incurrence of $600.0 million in New Term Loans which closed on February 1, 2012;

• an increase of $5.8 million in swap interest expense. We have entered into interest rate swap agreements related to all of our variable rate debt except $100.0 million of term loan indebtedness and $69.0 million outstanding under our revolving credit facility;

• an increase of $4.4 million related to our $325.0 million 4.950% Guaranteed Notes due 2018 issued in April 2011, and;

• an increase of $0.4 million related to our $250.0 million 3.950% Guaranteed Notes Due 2023 issued in December 2012.

The increase of $22.0 million in interest expense described above was offset by the following decreases in interest expense during 2012 compared to 2011:

• decrease of $7.1 million related to our $151.5 million 5.400% Guaranteed Notes that matured and were repaid in full during April 2012;

• decrease of $5.4 million in mortgage interest expense which is directly related to the $208.4 million decrease in mortgage indebtedness during 2011 and the $60.0 million decrease during 2012;

• decrease of $5.3 million related to the repurchases of debt subsequent to the fourth quarter of 2011, including (i) $4.3 million of our 5.400% Guaranteed Notes due 2014, (ii) $60.8 million of our 7.500% Guaranteed Notes due 2015, and (iii) $99.6 million of our 6.000% Guaranteed Notes due 2016;

• decrease of $2.1 million related to the extinguishment of our Prior Term Loans, and;

• decrease in interest expense of $0.6 million related to an increase in capitalized interest.

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Interest Expense - Deferred Financing Costs

Deferred financing costs increased $1.2 million during 2012 compared to 2011 mainly due to the write-off of costs related to repurchases of debt during 2012, which included, (i) $0.3 million of our 5.750% Guaranteed Notes due 2012, (ii) $4.3 million of our 5.400% Guaranteed Notes due 2014, (iii) $60.8 million of our 7.500% Guaranteed Notes due 2015, (iv) $99.6 million of our 6.000% Guaranteed Notes due 2016 and (v) $150.0 million of term loan indebtedness.

Recognized Hedge Activity

Recognized hedge activity increased $3.0 million during 2012 due to the recognition of $3.0 million of early termination fees related to the termination of interest rate swap contracts. The interest rate swap contracts were terminated in connection with the repayment of the Company's $150.0 million fixed portion of its four-year term loan due February 1, 2016 during the fourth quarter of 2012 (see Note 7 of the notes to the consolidated financial statements for further details of these transactions). There were no comparable charges incurred during 2011.

Interest Expense - Financing obligation

Financing obligation interest expense relates to a property that we contributed to a joint venture in the fourth quarter of 2011 that did not qualify for sale accounting, and therefore increased by $1.0 million during 2012 as compared to 2011. The interest primarily represents our partner's 50% share of the net operating income of the property.

Equity in income of real estate ventures

The decrease in equity in income of real estate ventures of $1.0 million is primarily due to lower net income at the real estate venture properties during 2012 compared to 2011. We also recognized $0.7 million of net losses (inclusive of depreciation and amortization) related to the BDN AI Venture which was formed in the fourth quarter of 2011, of which $0.2 million related to acquisition costs incurred to acquire three properties during 2012.

Net Gain on Sales of Interests in Real Estate

During 2011, we recognized a $3.0 million net gain upon the sale of the remaining 11% ownership interest in three properties that we partially sold to one of our unconsolidated real estate ventures in December 2007. We had retained an 11% equity interest in these properties subject to a put/call at fixed prices for a period of three years from the time of the sale. In January 2011, we exercised the put/call which then transferred full ownership in the three properties to the real estate venture. Accordingly, our direct continuing involvement through our 11% interest in the properties ceased as a result of the transfer of the ownership interest. There were no comparable gains for 2012.

Loss on Real Estate Venture Formation

Loss on real estate venture formation increased by $0.7 million primarily due to our termination of an agreement with a third party broker that was entered into upon contributing two properties into a joint venture in December 2011. During 2012, we determined that it was in our best interest to terminate the contract in order to avoid additional commissions and fees on future joint venture acquisitions, recognizing the fee as an additional cost of forming the real estate venture.

Loss on Early Extinguishment of Debt

During 2012, we repurchased (i) $150.0 million of term loan indebtedness, (ii) $99.6 million of our 6.000% Guaranteed Notes due 2016, (iii) $60.8 million of our 7.500% Guaranteed Notes due 2015, (iv) $4.3 million of our 5.400% Guaranteed Notes due 2014, and (v) $0.3 million of our 5.750% Guaranteed Notes due 2012, which resulted in a net loss on early extinguishment of debt of $21.9 million. In addition, we prepaid the remaining balances on two of our existing mortgages, totaling $58.4 million, for which we incurred associated prepayment penalties of $0.1 million.

During 2011, we repurchased (i) $23.7 million of our 5.750% Guaranteed Notes due 2012 and (ii) $22.7 million of our 7.500% Guaranteed Notes due 2015, which resulted in a net loss on early extinguishment of debt of $3.3 million. The loss was offset by the write-off of the unamortized fixed-rate debt premium of $0.5 million related to the prepayment of two of our mortgage loans during 2011.

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Discontinued Operations

During 2012, we sold one property located in Moorestown, New Jersey, one property located in Herndon, Virginia, one property located in Carlsbad, California, and 11 flex/office properties located in Exton, Pennsylvania. 2012 discontinued operations were also revised for the properties sold during 2013. These properties had total revenues of $31.4 million, property operating expenses of $12.2 million, and $10.2 million of depreciation and amortization expense. In addition, we recognized a deferred gain related to two properties located in Trenton, New Jersey that were sold during the fourth quarter of 2009. The gain was deferred as a result of a note receivable that we held from the buyer in the amount of $22.5 million. The note receivable and accrued interest was paid in full during the second quarter of 2012, prior to its maturity date of October 2016. We recognized a net gain on sale related to these transactions of $34.8 million during 2012.

The amounts for 2011 are reclassified to include the operations of the properties sold subsequent to December 31, 2011, as well as all properties that were sold through 2011. Therefore, the discontinued operations amount for 2011 includes total revenue of $43.1 million, operating expense of $19.3 million, and depreciation and amortization of $16.2 million.

Net Income (Loss)

Net income (loss) increased by $11.2 million from 2011 to 2012 as a result of the factors described above. Net income is significantly impacted by depreciation of operating properties and amortization of acquired intangibles. These non-cash charges do not directly affect our ability to pay dividends. Amortization of acquired intangibles will continue over the related lease terms or estimated duration of the tenant relationships.

Loss per Common Share

Loss per share was $0.06 during 2012 as compared to a loss per share of $0.10 during 2011 as a result of the factors described above.

LIQUIDITY AND CAPITAL RESOURCES

General

Our principal liquidity needs for the next twelve months are as follows:

• fund normal recurring expenses,

• fund capital expenditures, including capital and tenant improvements and leasing costs,

• fund repayment of certain debt instruments when they mature,

• fund current development and redevelopment costs, and

• fund distributions to shareholders to maintain REIT status.

As of December 31, 2013, the Parent Company owned a 98.8% interest in the Operating Partnership. The remaining interest of approximately 1.2% pertains to common limited partnership interests owned by non-affiliated investors who contributed property to the Operating Partnership in exchange for their interests. As the sole general partner of the Operating Partnership, the Parent Company has full and complete responsibility for the Operating Partnership’s day-to-day operations and management. The Parent Company’s source of funding for its dividend payments and other obligations is the distributions it receives from the Operating Partnership.

We believe that our liquidity needs will be satisfied through available cash balances and cash flows generated by operations, financing activities and selective property sales. Rental revenue, expense recoveries from tenants, and other income from operations are the Company’s principal sources of cash to pay operating expenses, debt service, recurring capital expenditures and the minimum distributions required to maintain our REIT qualification. We seek to increase cash flows from our properties by maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. Our revenue also includes third-party fees generated by our property management, leasing, development and construction businesses. We believe that our revenue, together with proceeds from property sales and debt financings, will continue to provide funds for our short-term liquidity needs. However, material changes in our operating or financing activities may adversely affect our net cash flows. With uncertain economic conditions, vacancy rates may increase, effective rental rates on new and renewed leases may decrease and tenant installation costs, including concessions, may increase in most or all of our markets throughout 2014 and possibly beyond. As a result, our revenues and cash flows could be insufficient to cover operating expenses, including increased tenant installation costs, pay debt service or make distributions to shareholders over the short-term. If this situation were to occur, we expect that we would finance cash deficits through borrowings under our unsecured credit facility and other sources of debt and equity financings. In addition, a material adverse change in cash provided by operations could adversely affect our compliance with financial performance covenants under our unsecured credit facility,

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including unsecured term loans and unsecured notes. As of December 31, 2013, we were in compliance with all of our debt covenants and requirement obligations.

We use multiple financing sources to fund our long-term capital needs. When needed, we use borrowings under our unsecured credit facility for general business purposes, including to meet debt maturities and to fund distributions to shareholders as well as development and acquisition costs and other expenses from time to time as necessary. In light of the continuing volatility in financial markets and economic uncertainties, it is possible, that one or more lenders under our unsecured revolving credit facility could fail to fund a borrowing request. Such an event could adversely affect our ability to access funds from our unsecured credit facility when needed to fund distributions or pay expenses.

Our ability to incur additional debt is dependent upon a number of factors, including our credit ratings, the value of our unencumbered assets, our degree of leverage and borrowing restrictions imposed by our lenders. If one or more rating agencies were to downgrade our unsecured credit rating, our access to the unsecured debt market would be more limited and the interest rate under our unsecured credit facility and unsecured term loans would increase.

The Parent Company unconditionally guarantees the Operating Partnership’s secured and unsecured obligations, which, as of December 31, 2013, amounted to $669.8 million and $1,929.7 million, respectively.

We maintain a shelf registration statement that has registered the offering and sale of common shares, preferred shares, depositary shares, warrants and unsecured debt securities. Subject to the Company’s ongoing compliance with securities laws, and if warranted by market conditions, we may offer and sell equity and debt securities from time to time under the shelf registration statement.

The Parent Company, other than acting as the sole general partner of the Operating Partnership, also issues equity from time to time, the proceeds of which it contributes to the Operating Partnership in exchange for additional interests in the Operating Partnership, and guarantees debt obligations of the Operating Partnership. The Parent Company’s ability to sell common shares and preferred shares is dependent on, among other things, general market conditions for REITs, market perceptions about the Company as a whole and the current trading price of the Parent Company's shares.

On April 10, 2013, the Parent Company completed a public offering of 12,650,000 common shares, inclusive of 1,650,000 common shares issued upon exercise by the underwriters of the option granted to them to purchase additional shares. The Parent Company contributed the net proceeds from the sale of shares, amounting to $181.5 million after deducting underwriting discounts and commissions and other offering expenses, to the Operating Partnership in exchange for partnership units of the Operating Partnership. The Operating Partnership intends to continue to use the net proceeds for working capital, capital expenditures and other general corporate purposes, which may include acquisitions, developments and the repayment, repurchase and refinancing of debt.

The Operating Partnership also considers net sales of selected properties as another source of managing its liquidity. During 2013, we sold 21 properties, including seven properties contributed to the Austin Venture, containing 2.5 million in net rentable square feet and 8.0 acres of land for aggregate net cash proceeds of $423.5 million. Also during 2013, we purchased three properties containing 2.1 million net rentable square feet and 24.9 acres of land for aggregate net cash distributions of $161.6 million.

In addition, we sold interests in an unconsolidated real estate venture containing 0.6 million in net rentable square feet for net cash proceeds of $17.0 million.

Cash Flows

The following discussion of our cash flows is based on the consolidated statements of cash flows and is not meant to be a comprehensive discussion of the changes in our cash flows for the years presented.

As of December 31, 2013 and 2012, we maintained cash and cash equivalents of $263.2 million and $1.5 million, respectively. The following are the changes in cash flow from our activities for the years ended December 31, 2013, 2012 and 2011 (in thousands):

Activity	2013			2012			2011
Operating	$	183,484		$	159,110		$	177,247
Investing	104,708			(74,864		)	(46,163		)
Financing	(26,534		)	(83,107		)	(147,239		)
Net cash flows	$	261,658		$	1,139		$	(16,155	)

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Our principal source of cash flows is from the operation of our properties. We do not restate our cash flows for discontinued operations.

The net increase of $24.4 million in cash from operating activities during 2013 compared to 2012 is primarily attributable to increased net operating income on the same store portfolio in the 2013 period as compared to the 2012 period along with decreased cash paid for interest expense, as well as the timing of cash receipts and cash expenditures in the normal course of operations.

The increase in net cash from investing activities of $179.6 million during 2013 compared to 2012 is primarily attributable to the following:

• an increase of $252.6 million of net proceeds from 21 property sales during 2013, compared to 14 property sales during 2012 (see Note 3 to the consolidated financial statements for details);

• an increase of $17.0 million from the sale of our interest in an unconsolidated real estate venture, compared to no such sales during 2012 (see Note 4 to the consolidated financial statements for details);

• an increase from the reimbursement of $2.0 million in pre-formation development costs of an unconsolidated real estate venture;

• a decrease in net investment in real estate ventures of $32.3 million, primarily reflecting 2012 activity including: $26.1 million that we contributed to fund our share of an acquisition of three office properties by the real estate venture known as "Brandywine-AI Venture LLC;" $24.2 million that we contributed to the real estate venture to fund our pro rata share of the repayment of mortgage indebtedness; and $9.7 million that we contributed to our then existing real estate ventures that owned One and Two Commerce Square; offset in 2013 by: contributions to 4040 Wilson totaling $13.5 million, contributions to the evo at Cira Centre South venture of $13.4 million and contributions to fund our share of One and Two Commerce Square ventures' operations totaling $6.6 million,

• an increase in cash distributions from unconsolidated Real Estate Ventures of $2.4 million during 2013 compared to 2012, and;

• a decrease in interest expense of $11.0 million due to debt repurchases.

The increase in net cash from investing activities was partially offset by the following transactions:

• an increase of $84.0 million in funds used to acquire operating properties, attributable to the acquisitions of One and Two Commerce Square for $70.0 million, Four Points Centre for $46.1 million and the ground leases at Cira Centre and Three Logan Square totaling $45.3 million. During 2012 the acquisitions totaling $77.6 million were mainly attributable to the acquisitions of the 660 West Germantown Pike development, 1900 Market Street, and 7000 West at Lantana;

• a decrease of $23.2 million related to proceeds received in connection with the repayment of two mortgage notes receivable during 2012. There were no comparable mortgage notes receivable repayments during 2013;

• an increase in capital expenditures for tenant and building improvements and leasing commissions by $22.2 million during the 2013 compared to the 2012;

• a decrease of $0.6 million in loan proceeds received from an unconsolidated real estate venture partner during 2012, with no such payments received during 2013; and,

• a decrease in advances for purchase of tenant assets, net of repayments of $0.4 million during 2013 when compared to 2012.

The net increase of $56.6 million in cash from financing activities during 2013 compared to 2012 is mainly due to the following:

• an increase in proceeds from credit facility borrowings of $95.5 million during 2013 compared to 2012;

• a decrease in repayments of the Prior Credit Facility and mortgage notes payable of $99.2 million during 2013 compared to 2012;

• proceeds from the issuance of common shares of $181.5 million during 2013 with no comparable proceeds in 2012;

• the redemption of preferred shares and partnership units of $118.2 million during 2012 with no redemption in 2013;

• a decrease in the repayment of unsecured notes of $306.7 million during 2013 compared to 2012;

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• the repayment of an unsecured term loan of $190.5 million during 2012 with no such repayment during 2013;

• a decrease in debt financing costs of $9.8 million during 2013 compared to 2012, and;

• an increase in stock option exercise proceeds of $1.4 million for 2013 compared to 2012;

The net increase in cash from financing activities described above was offset by the following:

• proceeds from the issuance of unsecured notes, which totaled $248.2 million in 2012, with no comparable proceeds during 2013;

• term loan borrowings of $600.0 million during the 2012 with no comparable borrowings during 2013;

• proceeds received from the issuance of preferred shares of $96.2 million during 2012 with no comparable issuance in 2013, and;

• distributions paid by the Parent Company to its shareholders and on non-controlling interests of $98.5 million during 2013 compared to $97.5 million during 2012.

Capitalization

Indebtedness

The table below summarizes our indebtedness under our mortgage notes payable, our unsecured notes and our unsecured credit facility at December 31, 2013 and December 31, 2012:

	December 31, 2013			December 31, 2012
	(dollars in thousands)
Balance:
Fixed rate	$	2,499,465		$	2,302,895
Variable rate — unhedged	100,000			169,000
Total	$	2,599,465		$	2,471,895
Percent of Total Debt:
Fixed rate	96.2		%	93.2		%
Variable rate — unhedged	3.8		%	6.8		%
Total	100		%	100		%
Weighted-average interest rate at period end:
Fixed rate	5.2		%	5.3		%
Variable rate — unhedged	1.9		%	1.9		%
Total	5.0		%	5.1		%
Weighted-average maturity in years:
Fixed rate	5.6			6.6
Variable rate — unhedged	2.1			3.1
Total	5.5			6.4

The variable rate debt shown above generally bear interest based on various spreads over a LIBOR term selected by us.

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Scheduled principal payments and related weighted average annual effective interest rates for our debt as of December 31, 2013 are as follows (in thousands):

Period	Scheduled amortization		Principal maturities		Total		Weighted average interest rate of maturing debt
2014	$	13,826	$	218,549	$	232,375	5.58	%
2015	13,668		395,986		409,654		5.31	%
2016	9,926		457,779		467,705		4.82	%
2017	9,906		320,417		330,323		5.63	%
2018	11,954		325,000		336,954		5.19	%
2019	13,156		200,000		213,156		3.81	%
2020	13,915		—		13,915		6.64	%
2021	14,719		—		14,719		6.64	%
2022	15,571		—		15,571		6.64	%
2023	14,666		351,236		365,902		6.64	%
Thereafter	120,581		78,610		199,191		4.27	%
Totals	$	251,888	$	2,347,577	$	2,599,465	5.03	%

Unsecured Credit Facility

We maintain a $600.0 million four-year unsecured revolving credit facility (the "Credit Facility") and three unsecured term loans in the aggregate amount of $450.0 million (collectively, the “Term Loans”), consisting of a $150.0 million three-year loan, a $100.0 million four-year loan and a $200.0 million seven-year loan.

We have the option to increase the amounts available to be advanced under the Credit Facility, the $150.0 million three-year term loan, and the $100.0 million four-year term loan by an aggregate of $200.0 million, subject to customary conditions and limitations, by obtaining additional commitments from the current lenders and other financial institutions. We also have the option to extend the maturity dates of each of the Credit Facility, the $150.0 million three-year term loan and the $100.0 million four-year term loan by one year, subject to payment of an extension fee and other customary conditions and limitations. We can prepay the $150.0 million three-year term and the $100.0 million four-year term loans at any time without penalty. The $200.0 million seven-year term loan is subject to a prepayment penalty of 1% through February 1, 2015 with no penalty thereafter.

The spread to LIBOR for LIBOR-based loans under the Credit Facility and Term Loans will depend on our unsecured senior debt credit rating. Based on our current credit rating, the spread for such loans will be 150, 175, 175 and 190 basis points under the Credit Facility, the $150.0 million three-year term loan, the $100.0 million four-year term loan and the $200.0 million seven-year term loan, respectively. At our option, advances under the New Credit Facility and New Term Loans may also bear interest at a per annum floating rate equal to the higher of the prime rate or the federal funds rate plus 0.50% per annum. The Credit Facility contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loans to us at a reduced rate. We executed hedging transactions that fix the rate on the $200.0 million seven-year term loan at a 3.623% average for its full term, and the rate on the $150.0 million three-year term loan at a 2.596% average rate for periods of three to four years. All hedges commenced on February 1, 2012 and the rates are inclusive of the LIBOR spread based on our current investment grade rating.

The Credit Facility and Term Loans contain financial and operating covenants and restrictions, including covenants that relate to our incurrence of additional debt; granting liens; consummation of mergers and consolidations; the disposition of assets and interests in subsidiaries; the making of loans and investments; and the payment of dividends. The restriction on dividends permits us to pay dividends to the greater of (i) an amount required for us to retain our qualification as a REIT and (ii) 95% of our funds from operations. The Credit Facility and Term Loans include financial covenants that require us to maintain an interest coverage ratio, a fixed charge coverage ratio, an unsecured debt ratio and an unencumbered cash flow ratio above specified levels; to maintain a minimum net worth above an amount determined on a specified formula; and to maintain a leverage ratio and a secured debt ratio below certain maximum levels. Another financial covenant limits the ratio of our unsecured debt to the value of our unencumbered properties.

We were in compliance with all financial and non-financial covenants under the Credit Facility and our credit agreements as of December 31, 2013. We continuously monitor our compliance with all covenants. Certain covenants restrict our ability to obtain alternative sources of capital. While we believe that we will remain in compliance with our covenants, a slow-down in the economy and a decrease in availability of debt financing could result in non-compliance with covenants.

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Unsecured Notes and Mortgage Notes

The Operating Partnership is the issuer of our unsecured notes which are fully and unconditionally guaranteed by the Parent Company. During the year-ended December 31, 2013, we repurchased $29.3 million of our outstanding unsecured notes in a series of transactions which are summarized in the table below (in thousands):

Notes	Principal		Repurchase Amount		Loss on Early Extinguishment of Debt			Acceleration of Deferred Financing Amortization
2014 5.400% Notes	$	19,830	$	20,822	$	(1,020	)	$	16
2015 7.500% Notes	8,910		9,902		(1,036		)	23
2016 6.000% Notes	510		572		(63		)	1
	$	29,250	$	31,296	$	(2,119	)	$	40

The indenture under which the Operating Partnership issued its unsecured notes contains financial covenants, including (i) a leverage ratio not to exceed 60%, (ii) a secured debt leverage ratio not to exceed 40%, (iii) a debt service coverage ratio of greater than 1.5 to 1.0 and (iv) an unencumbered asset value of not less than 150% of unsecured debt. The Operating Partnership is in compliance with all covenants as of December 31, 2013.

The Operating Partnership has mortgage loans that are collateralized by certain of its Properties. Payments on mortgage loans are generally due in monthly installments of principal and interest, or interest only. The Operating Partnership intends to refinance or repay its mortgage loans as they mature through the use of proceeds from selective Property sales and secured or unsecured borrowings. However, in the current and expected future economic environment one or more of these sources may not be available on attractive terms or at all.

The charter documents of the Parent Company and Operating Partnership do not limit the amount or form of indebtedness that the Operating Partnership may incur, and its policies on debt incurrence are solely within the discretion of the Parent Company’s Board of Trustees, subject to the financial covenants in the Credit Facility, indenture and other credit agreements.

Equity

In order to maintain is qualification as a REIT, the Parent Company is required to, among other things, pay dividends to its shareholders of at least 90% of its REIT taxable income. On December 10, 2013, the Parent Company declared a distribution of $0.15 per common share, totaling $23.9 million, which it paid on January 21, 2014 to its shareholders of record as of January 6, 2014. In addition, the Parent Company declared a distribution on its Series E Preferred Shares to holders of record as of December 30, 2013. These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on January 15, 2014 to holders of Series E Preferred Shares totaled $1.7 million. To fund this distribution, on December 10, 2013, the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of December 30, 2013. These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on January 15, 2014 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million.

On April 10, 2013, the Parent Company completed a public offering of 12,650,000 common shares, inclusive of 1,650,000 common shares issued upon exercise by the underwriters of the option granted to them to purchase additional shares. The Parent Company contributed the net proceeds from the sale of shares, amounting to $181.5 million after deducting underwriting discounts and commissions and other offering expenses, to the Operating Partnership in exchange for partnership units of the Operating Partnership. The Operating Partnership continues to use the net proceeds for working capital, capital expenditures and other general corporate purposes, which may include acquisitions, developments and the repayment, repurchase and refinancing of debt.

The Parent Company maintains a share repurchase program under which its Board of Trustees has authorized the Parent Company to repurchase common shares from time to time in accordance with the limits set by the Board of Trustees. As of December 31, 2013, there were 539,200 shares available for repurchase under this program. The Parent Company’s Board of Trustees has not limited the duration of the program and the program may be terminated at any time.

The Parent Company did not repurchase any shares the fiscal year ended December 31, 2013 and accordingly, the Operating Partnership did not repurchase any units in connection with the Parent Company's share repurchase program.

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The Parent Company also maintains a continuous offering program (the "Offering Program"), under which we may sell up to an aggregate amount of 16,000,000 common shares until November 5, 2016 in at the market offerings. This program was put in place on November 5, 2013 in replacement of a prior continuous equity offering program that expired on March 10, 2013 (the "Prior Offering Program"). During the year ended December 31, 2013 we did not sell any shares under either the Offering Program or the Prior Offering Program.

Inflation

A majority of our leases provide for tenant reimbursement of real estate taxes and operating expenses either on a triple net basis or over a base amount. In addition, many of our office leases provide for fixed base rent increases. We believe that inflationary increases in expenses will be partially offset by expense reimbursement and contractual rent increases.

Commitments and Contingencies

The following table outlines the timing of payment requirements related to our contractual commitments as of December 31, 2013:

	Payments by Period (in thousands)
	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
Mortgage notes payable (a)	$	669,762	$	13,828	$	319,815	$	42,277	$	293,842
Unsecured term loan	450,000		—		250,000		—		200,000
Unsecured debt (a)	1,479,703		218,549		307,544		625,000		328,610
Ground leases (b)	64,055		1,303		2,606		2,606		57,540
Development contracts (c)	13,590		13,590		—		—		—
Interest expense (d)	496,900		114,609		160,959		86,318		135,014
Other liabilities (e)	22,045		4,407		—		—		17,638
	$	3,196,055	$	366,286	$	1,040,924	$	756,201	$	1,032,644

(a) Amounts do not include unamortized discounts and/or premiums.

(b) Future minimum rental payments under the terms of all non-cancelable ground leases under which we are the lessee are expensed on a straight-line basis regardless of when payments are due. The table also does not include the future minimum rental payments related to two ground leases in Philadelphia, Pennsylvania. These ground leases are discussed below.

(c) Represents contractual obligations for two development projects and does not contemplate all costs expected to be incurred for such developments. For information regarding real estate venture developments, see Item 1.

(d) Variable rate debt future interest expense commitments are calculated using December 31, 2013 interest rates.

(e) Other liabilities consist of (i) our obligation to fund the remaining balance, as of December 31, 2013, of $4.4 million on our commitment to fund post-closing capital expenditures of $5.2 million on behalf of our Austin Venture (See Item 2 - “Properties”) and (ii) $17.6 million of deferred compensation liabilities and the interest accretion on the existing transfer tax liability on Two Logan Square in Philadelphia, Pennsylvania (see related discussion below), as of December 31, 2013.

The ground leases entered into in Philadelphia, Pennsylvania, which provide for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the properties after certain returns are achieved by the Company. Such amounts, if any, will be reflected as contingent rent when incurred. The leases also provide for payment by the Company of certain operating costs relating to the land, primarily real estate taxes. The above schedule of future minimum rental payments does not include any contingent rent amounts or any reimbursed expenses.

As part of the Operating Partnership’s September 2004 acquisition of a portfolio of properties from the Rubenstein Company (which we refer to as the “TRC acquisition”), the Operating Partnership acquired its interest in Two Logan Square, a 708,844 square foot office building in Philadelphia, primarily through its ownership of a second and third mortgage secured by this property. This property is consolidated as the borrower is a variable interest entity and the Operating Partnership, through its ownership of the second and third mortgages, is the primary beneficiary. The Operating Partnership currently does not expect to take title to Two Logan Square until, at the earliest, September 2019. If the Operating Partnership takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Operating Partnership has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property an amount equal to $2.9 million. On the TRC acquisition date, the Operating Partnership recorded a liability of $0.7 million and this amount will accrete up to $2.9 million through September 2019. As of December 31, 2013, the Operating Partnership has a balance of $1.6 million for this liability on its consolidated balance sheet.

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The Operating Partnership was audited by the IRS for its 2004 tax year. The audit concerned the tax treatment of the TRC acquisition in September 2004 in which the Operating Partnership acquired a portfolio of properties through the acquisition of a limited partnership. On December 17, 2010, the Operating Partnership received notice that the IRS proposed an adjustment to the allocation of recourse liabilities allocated to the contributor of the properties. The Operating Partnership appealed the proposed adjustment and during the second quarter of 2013 entered into a settlement agreement with the IRS which will not result in a material liability for the Operating Partnership for federal income taxes. The contributor of partnership interests in the 2004 transaction has agreed not to assert a claim against the Operating Partnership under the tax protection agreement entered into as part of the transaction.

As part our 2006 merger with Prentiss Properties Trust, our 2004 TRC acquisition and several of our other transactions, it agreed not to sell certain of the properties we acquired in transactions that would trigger taxable income to the former owners. In the case of the TRC acquisition, we agreed not to sell acquired properties for periods up to 15 years from the date of the TRC acquisition as follows at December 31, 2013: One Rodney Square and 130/150/170 Radnor Financial Center (January, 2015); and One Logan Square, Two Logan Square and Radnor Corporate Center (January, 2020). In the Prentiss acquisition, we assumed the obligation of Prentiss not to sell Concord Airport Plaza before March, 2018. Our agreements generally provide that we may dispose of the subject properties only in transactions that qualify as tax-free exchanges under Section 1031 of the Internal Revenue Code or in other tax deferred transactions. If we were to sell a restricted property before expiration of the restricted period in a non-exempt transaction, we would be required to make significant payments to the parties who sold the applicable property to us for tax liabilities attributed to them. Similarly, as part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to not sell these two properties in certain taxable transactions prior to October 20, 2013 without the holder’s consent.

In connection with the development of the IRS Philadelphia Campus and the Cira South Garage, during 2008, the Operating Partnership entered into a historic tax credit and new markets tax credit arrangement, respectively. The Operating Partnership is required to be in compliance with various laws, regulations and contractual provisions that apply to its historic and new market tax credit arrangements. Non-compliance with applicable requirements could result in projected tax benefits not being realized and therefore, require a refund to US Bancorp or a reduction of investor capital contributions, which are reported as deferred income in the Operating Partnership’s consolidated balance sheet, until such time as its obligation to deliver tax benefits is relieved. The remaining compliance periods for its tax credit arrangements runs through 2015. The Operating Partnership does not anticipate that any material refunds or reductions of investor capital contributions will be required in connection with these arrangements.

We invest in properties and regularly incur capital expenditures in the ordinary course of business to maintain the properties. We believe that such expenditures enhance our competitiveness. We also enter into construction, utility and service contracts in the ordinary course of its business which may extend beyond one year. These contracts typically provide for cancellation with insignificant or no cancellation penalties.

Guarantees

As of December 31, 2013, we had provided guarantees on behalf of certain of the real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures we have provided, and expect to continue to provide, cost overrun and completion guarantees, with rights of contribution among partners in ventures, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements.

As part of our acquisition of properties from time to time in tax-deferred transactions, we have agreed to provide certain of the prior owners of the acquired properties with the right to guarantee our indebtedness. If we were to seek to repay the indebtedness guaranteed by the prior owner before the expiration of the applicable agreement, we would be required to provide the prior owner an opportunity to guarantee qualifying replacement debt. These debt maintenance agreements may limit our ability to refinance indebtedness on terms that will be favorable to us. As part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to maintain qualifying mortgage debt through October 20, 2021, in the amounts of not less than $130.2 million on One Commerce Square and $107.9 million on Two Commerce Square. Similarly, we have agreements in place with other contributors of assets to us that obligate us to maintain debt available for them to guaranty.

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Interest Rate Risk and Sensitivity Analysis

The analysis below presents the sensitivity of the market value of the Operating Partnership’s financial instruments to selected changes in market rates. The range of changes chosen reflects its view of changes which are reasonably possible over a one-year period. Market values are the present value of projected future cash flows based on the market rates chosen.

Our financial instruments consist of both fixed and variable rate debt. As of December 31, 2013, our consolidated debt consisted of $669.8 million of mortgage loans and $1,401.1 million of unsecured notes, all of which are fixed rate borrowings. We also have variable rate debt consisting of $78.6 million in trust preferred securities and $450.0 million of unsecured term loans all of which are swapped to fixed rates, except for $100.0 million of unsecured term loans which bear interest at a variable rate. All financial instruments were entered into for other than trading purposes and the net market value of these financial instruments is referred to as the net financial position. Changes in interest rates have different impacts on the fixed and variable rate portions of our debt portfolio. A change in interest rates on the fixed portion of the debt portfolio impacts the net financial instrument position, but has no impact on interest incurred or cash flows. A change in interest rates on the variable portion of the debt portfolio impacts the interest incurred and cash flows, but does not impact the net financial instrument position.

If market rates of interest increase by 100 basis points, the fair value of our outstanding fixed-rate mortgage debt would decrease by approximately $33.1 million. If market rates of interest decrease by 100 basis points, the fair value of our outstanding fixed-rate mortgage debt would increase by approximately $36.1 million.

As of December 31, 2013, based on prevailing interest rates and credit spreads, the fair value of our $1,401.1 million of unsecured notes was $1,471.0 million. For sensitivity purposes, a 100 basis point change in the discount rate equates to a change in the total fair value of our debt of approximately $14.0 million at December 31, 2013.

From time to time or as the need arises, we use derivative instruments to manage interest rate risk exposures and not for speculative purposes. The total carrying value of our variable rate debt (including variable swapped to fixed) was approximately $528.6 million and $597.6 million at December 31, 2013 and December 31, 2012, respectively. The total fair value of our debt was approximately $526.7 million and $595.7 million at December 31, 2013 and December 31, 2012, respectively. For sensitivity purposes, if market rates of interest increase by 100 basis points the fair value of our variable rate debt would decrease by approximately $7.1 million at December 31, 2013. If market rates of interest decrease by 100 basis points the fair value of our outstanding variable rate debt would increase by approximately $3.4 million. A 100 basis point change in the market rate of interest equates to a change in the fair value of its debt of approximately $1.7 million at December 31, 2012.

At December 31, 2013, our outstanding variable rate debt based on LIBOR totaled approximately $528.6 million, of which $100.0 million remained variable, with the remaining $428.6 million being swapped to fixed. At December 31, 2013, the interest rate on our variable rate debt was approximately 1.9%. If market interest rates on our variable rate debt were to change by 100 basis points, total interest expense would have changed by approximately $0.3 million for year-ended December 31, 2013.

These amounts were determined solely by considering the impact of hypothetical interest rates on our financial instruments. Due to the uncertainty of specific actions it may undertake to minimize possible effects of market interest rate increases, this analysis assumes no changes in our financial structure.

Funds from Operations (FFO)

Pursuant to the revised definition of FFO adopted by the Board of Governors of the National Association of Real Estate Investment Trusts (“NAREIT”), we calculate FFO by adjusting net income/(loss) attributable to common unit holders (computed in accordance with GAAP) for gains (or losses) from sales of properties, impairment losses on depreciable consolidated real estate, impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated Real Estate Ventures, real estate related depreciation and amortization, and after similar adjustments for unconsolidated Real Estate Ventures. FFO is a non-GAAP financial measure. The Operating Partnership believes that the use of FFO combined with the required U.S. GAAP presentations, has been beneficial in improving the understanding of operating results of REITs among the investing public and making comparisons of REITs’ operating results more meaningful. The Operating Partnership considers FFO to be a useful measure for reviewing comparative operating and financial performance because, by excluding gains or losses related to sales of previously depreciated operating real estate assets and real estate depreciation and amortization, FFO can help the investing public compare the operating performance of a company’s real estate between periods or as compared to other companies. The Operating Partnership’s computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently.

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The Operating Partnership considers net income, as defined by U.S. GAAP, to be the most comparable earnings measure to FFO. While FFO and FFO per unit are relevant and widely used measures of operating performance of REITs, FFO does not represent cash flow from operations or net income as defined by U.S. GAAP and should not be considered as alternatives to those measures in evaluating the Company’s liquidity or operating performance. The Operating Partnership believes that to further understand our performance, FFO should be compared with its reported net income/(loss) attributable to common unit holders and considered in addition to cash flows in accordance with GAAP, as presented in our consolidated financial statements.

The following table presents a reconciliation of net income (loss) attributable to common unit holders to FFO for the years ended December 31, 2013 and 2012:

	Year-ended
	December 31, 2013			December 31, 2012
	(amounts in thousands, except share information)
Net income (loss) attributable to common unitholders	$	35,926		$	(8,304	)
Add (deduct):
Amount allocated to unvested restricted unitholders	363			376
Net (gain) loss on real estate venture transactions	(29,604		)	950
Net gain on disposition of discontinued operations	(3,382		)	(34,774		)
Net gain from remeasurement of investments in real estate ventures	(6,866		)	—
Depreciation and amortization:
Real property — continuing operations	160,665			148,871
Leasing costs including acquired intangibles — continuing operations	36,217			38,983
Real property — discontinued operations	1,922			10,208
Leasing costs including acquired intangibles — discontinued operations	3			291
Company’s share of unconsolidated real estate ventures	15,959			14,788
Funds from operations	$	211,203		$	171,389
Funds from operations allocable to unvested restricted shareholders	(830		)	(856		)
Funds from operations available to common share and unit holders (FFO)	$	210,373		$	170,533
Weighted-average shares/units outstanding — fully diluted	156,203,398			146,408,921

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

See discussion in Management’s Discussion and Analysis of Financial Condition and Results of Operations included in Item 7 herein.

Item 8. Financial Statements and Supplementary Data

The financial statements and supplementary financial data of the Parent Company and the Operating Partnership and the reports thereon of PricewaterhouseCoopers LLP, an independent registered public accounting firm, with respect thereto are listed under Items 15(a) and 15(b) and filed as part of this Annual Report on Form 10-K. See Item 15.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None

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Item 9A.    Controls and Procedures

Controls and Procedures (Parent Company)

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of the Parent Company’s management, including its principal executive officer and principal financial officer, the Parent Company’s management conducted an evaluation of its disclosure controls and procedures, as such term is defined under Rule 13a-15(e) promulgated under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Based on this evaluation, the principal executive officer and the principal financial officer of the Parent Company concluded that the Parent Company’s disclosure controls and procedures were effective as of the end of the period covered by this annual report.

Management’s Report on Internal Control Over Financial Reporting

The management of the Parent Company is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f).

Under the supervision and with the participation of the Parent Company’s management, including its principal executive officer and principal financial officer, the Parent Company’s management conducted an evaluation of the effectiveness of the Parent Company's internal control over financial reporting based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 1992. Based on this evaluation under the framework in Internal Control — Integrated Framework, the Parent Company’s management concluded that the Parent Company's internal control over financial reporting was effective as of December 31, 2013.

The effectiveness of the Parent Company’s internal control over financial reporting as of December 31, 2013 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in its report which is included herein.

Changes in Internal Control over Financial Reporting

There have not been any changes in the Parent Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth fiscal quarter to which this report relates that have materially affected, or are reasonably likely to materially affect, the Parent Company’s internal control over financial reporting.

Controls and Procedures (Operating Partnership)

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of the Operating Partnership’s management, including its principal executive officer and principal financial officer, the Operating Partnership’s management conducted an evaluation of its disclosure controls and procedures, as such term is defined under Rule 13a-15(e) promulgated under the Exchange Act. Based on this evaluation, the principal executive officer and the principal financial officer of Operating Partnership concluded that the Operating Partnership’s disclosure controls and procedures were effective as of the end of the period covered by this annual report.

Management’s Report on Internal Control Over Financial Reporting

The management of the Operating Partnership is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f).

Under the supervision and with the participation of the Operating Partnership’s management, including its principal executive officer and principal financial officer, the Operating Partnership’s management conducted an evaluation of the effectiveness of the Operating Partnership's internal control over financial reporting based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 1992. Based on this evaluation under the framework in Internal Control — Integrated Framework, the Operating Partnership’s management concluded that the Operating Partnership's internal control over financial reporting was effective as of December 31, 2013.

The effectiveness of the Operating Partnership’s internal control over financial reporting as of December 31, 2013 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in its report which is included herein.

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Changes in Internal Control over Financial Reporting.

There have not been any changes in the Operating Partnership’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth fiscal quarter to which this report relates that have materially affected, or are reasonably likely to materially affect, the Operating Partnership’s internal control over financial reporting.

Item 9B.    Other Information

None.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance

Incorporated herein by reference to the Company’s definitive proxy statement to be filed with respect to its 2014 Annual Meeting of Shareholders.

Item 11. Executive Compensation

Incorporated herein by reference to the Company’s definitive proxy statement to be filed with respect to its 2014 Annual Meeting of Shareholders.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters

Incorporated herein by reference to the Company’s definitive proxy statement to be filed with respect to its 2014 Annual Meeting of Shareholders.

Item 13. Certain Relationships and Related Transactions, and Director Independence

Incorporated herein by reference to the Company’s definitive proxy statement to be filed with respect to its 2014 Annual Meeting of Shareholders.

Item 14. Principal Accountant Fees and Services

Incorporated herein by reference to the Company’s definitive proxy statement to be filed with respect to its 2014 Annual Meeting of Shareholders.

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PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a) Financial Statements and Schedules of Brandywine Realty Trust

(b) Financial Statements and Schedules of Brandywine Operating Partnership

The financial statements and schedules of the Parent Company and the Operating Partnership listed below are filed as part of this annual report on the pages indicated.

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Index to Financial Statements and Schedule

	Page
Report of Independent Registered Public Accounting Firm (Brandywine Realty Trust)	F- 1
Report of Independent Registered Public Accounting Firm (Brandywine Operating Partnership, L.P.)	F- 2
Financial Statements of Brandywine Realty Trust
Consolidated Balance Sheets as of December 31, 2013 and 2012	F- 3
Consolidated Statements of Operations for the Years Ended December 31, 2013, 2012 and 2011	F- 4
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2013, 2012 and 2011	F- 5
Consolidated Statements of Beneficiaries’ Equity for the Years Ended December 31, 2013, 2012 and 2011	F- 6
Consolidated Statements of Cash Flows for the Years Ended December 31, 2013, 2012 and 2011	F- 9
Financial Statements of Brandywine Operating Partnership, L.P.
Consolidated Balance Sheets as of December 31, 2013 and 2012	F- 11
Consolidated Statements of Operations for the Years Ended December 31, 2013, 2012 and 2011	F- 12
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2013, 2012 and 2011	F- 13
Consolidated Statements of Partners’ Equity for the Years Ended December 31, 2013, 2012 and 2011	F- 14
Consolidated Statements of Cash Flows for the Years Ended December 31, 2013, 2012 and 2011	F- 17
Notes to Consolidated Financial Statements (Brandywine Realty Trust and Brandywine Operating Partnership, L.P.)	F- 19
Schedule II — Valuation and Qualifying Accounts (Brandywine Realty Trust and Brandywine Operating Partnership, L.P.)	F- 60
Schedule III — Real Estate and Accumulated Depreciation (Brandywine Realty Trust and Brandywine Operating Partnership, L.P.)	F- 61

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3.Exhibits

Exhibits No.	Description
3.1.1	Amended and Restated Declaration of Trust of Brandywine Realty Trust (amended and restated as of May 12, 1997) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated June 9, 1997 and incorporated herein by reference)
3.1.2	Articles of Amendment to Declaration of Trust of Brandywine Realty Trust (September 4, 1997) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated September 10, 1997 and incorporated herein by reference)
3.1.3	Articles of Amendment to Declaration of Trust of Brandywine Realty Trust (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated June 3, 1998 and incorporated herein by reference)
3.1.4	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust (September 28, 1998) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated October 13, 1998 and incorporated herein by reference)
3.1.5	Articles of Amendment to Declaration of Trust of Brandywine Realty Trust (March 19, 1999) (previously filed as an exhibit to Brandywine Realty Trust’s Form 10-K for the fiscal year ended December 31, 1998 and incorporated herein by reference)
3.1.6	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust (April 19, 1999) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated April 26, 1999 and incorporated herein by reference)
3.1.7	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust (December 30, 2003) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-A dated December 29, 2003 and incorporated herein by reference)
3.1.8	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust (February 5, 2004) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-A dated February 5, 2004 and incorporated herein by reference)
3.1.9	Articles of Amendment to Declaration of Trust of Brandywine Realty Trust (October 3, 2005) (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated October 4, 2005 and incorporated herein by reference)
3.1.10	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust (April 6, 2012) classifying and designating Series E Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share and liquidation preference $25 per share, of Brandywine Realty Trust (previously filed as an exhibit to Brandywine Realty Trust's Form 8-A dated April 6, 2012 and incorporated herein by reference)
3.1.11	Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (the “Operating Partnership”) (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated December 17, 1997 and incorporated herein by reference)
3.1.12	First Amendment to Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated December 17, 1997 and incorporated herein by reference)
3.1.13	Second Amendment to the Amended and Restated Agreement of Limited Partnership Agreement of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 13, 1998 and incorporated herein by reference)

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3.1.14	Third Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated May 14, 1998 and incorporated herein by reference)
3.1.15	Fourth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 13, 1998 and incorporated herein by reference)
3.1.16	Fifth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 13, 1998 and incorporated herein by reference)
3.1.17	Sixth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 13, 1998 and incorporated herein by reference)
3.1.18	Seventh Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.19	Eighth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.20	Ninth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.21	Tenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.22	Eleventh Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.23	Twelfth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2003 and incorporated herein by reference)
3.1.24	Thirteenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated September 21, 2004 and incorporated herein by reference)
3.1.25	Fourteenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated January 10, 2006 and incorporated herein by reference)
3.1.26	Fifteenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated August 18, 2006 and incorporated herein by reference)
3.1.27	Sixteenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated August 9, 2010 and incorporated herein by reference)

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3.1.28	Seventeenth Amendment to the Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P. (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 11, 2012 and incorporated herein by reference)
3.1.29	List of partners of Brandywine Operating Partnership, L.P.
3.2	Amended and Restated Bylaws of Brandywine Realty Trust (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K dated June 4, 2010 and incorporated herein by reference)
4.1	Form of 7.50% Series C Cumulative Redeemable Preferred Share Certificate (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-A dated December 29, 2003 and incorporated herein by reference)
4.2	Form of 7.375% Series D Cumulative Redeemable Preferred Share Certificate (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-A dated February 5, 2004 and incorporated herein by reference)
4.3	Form of 6.90% Series E Cumulative Redeemable Preferred Shares Certificate (previously filed as an exhibit to Brandywine Realty Trust's Form 8-A dated April 6, 2012 and incorporated herein by reference).
4.4.1	Indenture dated October 22, 2004 by and among Brandywine Operating Partnership, L.P., Brandywine Realty Trust, certain subsidiaries of Brandywine Operating Partnership, L.P. named therein and The Bank of New York Mellon, as Trustee (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 22, 2004 and incorporated herein by reference)
4.4.2	First Supplemental Indenture dated as of May 25, 2005 by and among Brandywine Operating Partnership, L.P., Brandywine Realty Trust, certain subsidiaries of Brandywine Operating Partnership, L.P. named therein and The Bank of New York Mellon, as Trustee (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated May 26, 2005 and incorporated herein by reference)
4.4.3	Second Supplemental Indenture dated as of October 4, 2006 by and among Brandywine Operating Partnership, L.P., Brandywine Realty Trust and The Bank of New York Mellon, as Trustee (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 4, 2006 and incorporated herein by reference)
4.4.4	Third Supplemental Indenture dated as of April 5, 2011 by and among Brandywine Operating Partnership, L.P., Brandywine Realty Trust and The Bank of New York Mellon, as Trustee (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 5, 2011 and incorporated herein by reference)
4.5	Form of $250,000,000 5.40% Guaranteed Note due 2014 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 22, 2004 and incorporated herein by reference)
4.6	Form of $250,000,000 aggregate principal amount of 6.00% Guaranteed Note due 2016 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated March 28, 2006 and incorporated herein by reference).
4.7	Form of $300,000,000 aggregate principal amount of 5.70% Guaranteed Notes due 2017 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 30, 2007 and incorporated herein by reference)
4.8	Form of $250,000,000 aggregate principal amount of 7.50% Guaranteed Notes due 2015 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated September 25, 2009 and incorporated herein by reference)
4.9	Form of $325,000,000 aggregate principal amount of 4.95% Guaranteed Notes due 2018 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 5, 2011 and incorporated herein by reference)

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4.10	Form of $250,000,000 aggregate principal amount of 3.95% Guaranteed Notes due 2023 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated December 18, 2012 and incorporated herein by reference)
10.1	Third Amended and Restated Revolving Credit Agreement dated as of December 15, 2011 (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2011 and incorporated herein by reference)
10.2	Term Loan A Agreement dated as of December 15, 2011 (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2011 and incorporated herein by reference)
10.3	Term Loan B Agreement dated as of December 15, 2011 (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2011 and incorporated herein by reference)
10.4	Term Loan C Agreement dated as of December 15, 2011 (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2011 and incorporated herein by reference)
10.5	Contribution Agreement dated August 18, 2004 with TRC Realty, Inc.-GP, TRC-LB LLC and TRC Associates Limited Partnership (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated August 19, 2004 and incorporated herein by reference)
10.6	Registration Rights Agreement (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated September 21, 2004 and incorporated herein by reference)
10.7	Tax Protection Agreement (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated September 21, 2004 and incorporated herein by reference)
10.8	Registration Rights Agreement dated as of October 3, 2005 (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated October 4, 2005 and incorporated herein by reference)
10.9	Letter to Cohen & Steers Capital Management, Inc. relating to waiver of share ownership limit (previously filed as an exhibit to Brandywine Realty Trust's Form 10-Q for the quarter ended June 30, 2003 and incorporated herein by reference)
10.10	Letter to RREEF America LLC relating to waiver of share ownership limit (previously filed as an exhibit to Brandywine Realty Trust's Form 10-K for the fiscal year ended December 31, 2009 and incorporated herein by reference)
10.11	Amended and Restated Employment Agreement dated as of February 9, 2007 of Gerard H. Sweeney** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated February 14, 2007 and incorporated herein by reference)
10.12	Letter Agreement dated March 1, 2012 modifying Amended and Restated Employment Agreement of Gerard H. Sweeney** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated March 7, 2012 and incorporated herein by reference)
10.13	Amended and Restated 1997 Long-Term Incentive Plan (as amended effective June 2, 2010)** (previously filed as an exhibit to Brandywine Realty Trust's Registration Statement on Form S-8, File No. 333-167266 and incorporated herein by reference)
10.14	Amended and Restated Executive Deferred Compensation Plan dated January 1, 2013** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated December 11, 2012 and incorporated herein by reference)

79

10.15	2007 Non-Qualified Employee Share Purchase Plan** (previously filed as an exhibit to Brandywine Realty Trust's Form 10-Q for the quarter ended March 31, 2007 and incorporated herein by reference)
10.16	Summary of Trustee Compensation**
10.17	Form of Non-Qualified Share Option Agreement to the President and CEO and Executive Vice President and CFO** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 11, 2008 and incorporated herein by reference)
10.18	Form of Non-Qualified Share Option Agreement to the executive officers (other than the President and CEO and Executive Vice President and CFO)** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 11, 2008 and incorporated herein by reference)
10.19	Form of Incentive Stock Option Agreement to the President and CEO and Executive Vice President and CFO ** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 11, 2008 and incorporated herein by reference)
10.20	Form of Incentive Stock Option Agreement to the executive officers (other than the President and CEO and Executive Vice President and CFO)** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 11, 2008 and incorporated herein by reference)
10.21	Forms of Non-Qualified Share Option Agreement for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 1, 2009 and incorporated herein by reference)
10.22	Forms of Incentive Stock Option Agreement for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K dated April 1, 2009 and incorporated herein by reference)
10.23	Form of Amended and Restated Change of Control Agreement with Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on February 4, 2010 and incorporated herein by reference)
10.24	Employment Agreement dated February 3, 2010 with Howard M. Sipzner** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on February 4, 2010 and incorporated herein by reference)
10.25	Forms of Incentive Stock Option Agreement (March 2010) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2010 and incorporated herein by reference)
10.26	Forms of Non-Qualified Share Option Agreement (March 2010) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2010 and incorporated herein by reference)
10.27	Form of Restricted Share Award (March 2011) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2011 and incorporated herein by reference)
10.28	Form of Restricted Performance Share Unit and Dividend Equivalent Rights Award Agreement (March 2011) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2011 and incorporated herein by reference)
10.29	Forms of Incentive Share Option Agreement (March 2011) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2011 and incorporated herein by reference)
10.30	Forms of Non-Qualified Share Option Agreement (March 2011) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2011 and incorporated herein by reference)

80

10.31	2011-2013 Restricted Performance Share Unit Program** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 8, 2011 and incorporated herein by reference)
10.32	Letter Agreement dated May 24, 2011 modifying options of President and Chief Executive Officer** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on May 24, 2011 and incorporated herein by reference)
10.33	Form of Restricted Share Award (March 2012) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 7, 2012 and incorporated herein by reference)
10.34	Form of Restricted Performance Share Unit and Dividend Equivalent Rights Award Agreement (March 2012) for Executive Officers** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 7, 2012 and incorporated herein by reference)
10.35	2012-2014 Restricted Performance Share Unit Program** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 7, 2012 and incorporated herein by reference)
10.36	Form of Performance Unit Award Agreement ** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 1, 2013 and incorporated herein by reference)
10.37	Form of Restricted Share Award ** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 1, 2013 and incorporated herein by reference)
10.38	2013 -2015 Performance Share Unit Program ** (previously filed as an exhibit to Brandywine Realty Trust's Form 8-K filed on March 1, 2013 and incorporated herein by reference)
10.39	Form of Restricted Share Award Agreement for non-employee Trustees ** (previously filed as an exhibit to Brandywine Realty Trust’s Form 10-Q for the quarter ended June 30, 2013 and incorporated herein by reference)
10.40	Sales Agency Agreement dated November 5, 2013 among Brandywine Realty Trust, Brandywine Operating Partnership, L.P. and RBC Capital Markets (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K filed on November 5, 2013 and incorporated herein by reference)
10.41	Sales Agency Agreement dated November 5, 2013 among Brandywine Realty Trust, Brandywine Operating Partnership, L.P. and Barclays Capital Inc. (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K filed on November 5, 2013 and incorporated herein by reference)
10.42	Sales Agency Agreement dated November 5, 2013 among Brandywine Realty Trust, Brandywine Operating Partnership, L.P. and Jefferies LLC (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K filed on November 5, 2013 and incorporated herein by reference)
10.43	Sales Agency Agreement dated November 5, 2013 among Brandywine Realty Trust, Brandywine Operating Partnership, L.P. and BNY Mellon Capital Markets LLC (previously filed as an exhibit to Brandywine Realty Trust’s Form 8-K filed on November 5, 2013 and incorporated herein by reference)
12.1	Statement re Computation of Ratios of Brandywine Realty Trust
12.2	Statement re Computation of Ratios of Brandywine Operating Partnership, L.P
21	List of subsidiaries
23.1	Consent of PricewaterhouseCoopers LLP relating to financial statements of Brandywine Realty Trust

81

23.2	Consent of PricewaterhouseCoopers LLP relating to financial statements of Brandywine Operating Partnership, L.P.
31.1	Certification of the Chief Executive Officer of Brandywine Realty Trust pursuant to 13a-14 under the Securities Exchange Act of 1934
31.2	Certification of the Chief Financial Officer of Brandywine Realty Trust pursuant to 13a-14 under the Securities Exchange Act of 1934
31.3	Certification of the Chief Executive Officer of Brandywine Realty Trust, in its capacity as the general partner of Brandywine Operating Partnership, L.P., pursuant to 13a-14 under the Securities Exchange Act of 1934
31.4	Certification of the Chief Financial Officer of Brandywine Realty Trust, in its capacity as the general partner of Brandywine Operating Partnership, L.P., pursuant to 13a-14 under the Securities Exchange Act of 1934
32.1	Certification of the Chief Executive Officer of Brandywine Realty Trust pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of the Chief Financial Officer of Brandywine Realty Trust pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.3	Certification of the Chief Executive Officer of Brandywine Realty Trust, in its capacity as the general partner of Brandywine Operating Partnership, L.P., pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.4	Certification of the Chief Financial Officer of Brandywine Realty Trust, in its capacity as the general partner of Brandywine Operating Partnership, L.P., pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
99.1	Material Tax Consequences

** Management contract or compensatory plan or arrangement

(c) Financial Statement Schedule: See Item 15 (a) and (b) above

82

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

BRANDYWINE REALTY TRUST
By:	/s/ Gerard H. Sweeney
	Gerard H. Sweeney
	President and Chief Executive Officer

Date: February 25, 2014

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/s/ Walter D’Alessio	Chairman of the Board and Trustee	February 25, 2014
Walter D’Alessio
/s/ Gerard H. Sweeney	President, Chief Executive Officer and Trustee	February 25, 2014
Gerard H. Sweeney	(Principal Executive Officer)
/s/ Howard M. Sipzner	Executive Vice President and Chief Financial Officer	February 25, 2014
Howard M. Sipzner	(Principal Financial Officer)
/s/ Gabriel J. Mainardi	Vice President and Chief Accounting Officer (Principal	February 25, 2014
Gabriel J. Mainardi	Accounting Officer)
/s/ Wyche Fowler	Trustee	February 25, 2014
Wyche Fowler
/s/ James Diggs	Trustee	February 25, 2014
James Diggs
/s/ Michael J. Joyce	Trustee	February 25, 2014
Michael J. Joyce
/s/ Anthony A. Nichols, Sr.	Trustee	February 25, 2014
Anthony A. Nichols, Sr.
/s/ Charles P. Pizzi	Trustee	February 25, 2014
Charles P. Pizzi

83

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

BRANDYWINE OPERATING PARTNERSHIP, L.P.
By:	Brandywine Realty Trust, its General Partner
By:	/s/ Gerard H. Sweeney
	Gerard H. Sweeney
	President and Chief Executive Officer

Date: February 25, 2014

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/s/ Walter D’Alessio	Chairman of the Board and Trustee	February 25, 2014
Walter D’Alessio
/s/ Gerard H. Sweeney	President, Chief Executive Officer and Trustee	February 25, 2014
Gerard H. Sweeney	(Principal Executive Officer)
/s/ Howard M. Sipzner	Executive Vice President and Chief Financial Officer	February 25, 2014
Howard M. Sipzner	(Principal Financial Officer)
/s/ Gabriel J. Mainardi	Vice President and Chief Accounting Officer (Principal	February 25, 2014
Gabriel J. Mainardi	Accounting Officer)
/s/ Wyche Fowler	Trustee	February 25, 2014
Wyche Fowler
/s/ James Diggs	Trustee	February 25, 2014
James Diggs
/s/ Michael J. Joyce	Trustee	February 25, 2014
Michael J. Joyce
/s/ Anthony A. Nichols, Sr.	Trustee	February 25, 2014
Anthony A. Nichols, Sr.
/s/ Charles P. Pizzi	Trustee	February 25, 2014
Charles P. Pizzi

84

Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Shareholders of Brandywine Realty Trust:

In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a) present fairly, in all material respects, the financial position of Brandywine Realty Trust and its subsidiaries (the “Company”) at December 31, 2013 and 2012, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2013 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedules listed in the accompanying index appearing under Item 15(a) present fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in 1992. The Company’s management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedules and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

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/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 25, 2014

F- 1

Report of Independent Registered Public Accounting Firm

To the Partners of Brandywine Operating Partnership, L.P.:

In our opinion, the consolidated financial statements listed in the index appearing under Item 15(b) present fairly, in all material respects, the financial position of Brandywine Operating Partnership, L.P. and its subsidiaries (the “Partnership”) at December 31, 2013 and 2012, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2013 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedules listed in the accompanying index appearing under Item 15(b) present fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in 1992. The Partnership’s management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedules and on the Partnership’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

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/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 25, 2014

F- 2

BRANDYWINE REALTY TRUST

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share information)

	December 31, 2013			December 31, 2012
ASSETS
Real estate investments:
Operating properties	$	4,669,289		$	4,726,169
Accumulated depreciation	(983,808		)	(954,665		)
Operating real estate investments, net	3,685,481			3,771,504
Construction-in-progress	74,174			48,950
Land inventory	93,351			102,439
Total real estate investments, net	3,853,006			3,922,893
Cash and cash equivalents	263,207			1,549
Accounts receivable, net	17,389			13,232
Accrued rent receivable, net	126,295			122,066
Investment in real estate ventures, at equity	180,512			193,555
Deferred costs, net	122,954			122,243
Intangible assets, net	132,329			70,620
Notes receivable	7,026			7,226
Other assets	62,377			53,325
Total assets	$	4,765,095		$	4,506,709
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	$	670,151		$	442,974
Unsecured credit facility	—			69,000
Unsecured term loans	450,000			450,000
Unsecured senior notes, net of discounts	1,475,230			1,503,356
Accounts payable and accrued expenses	83,693			71,579
Distributions payable	25,584			23,652
Deferred income, gains and rent	71,635			82,947
Acquired lease intangibles, net	34,444			33,859
Other liabilities	32,923			55,826
Total liabilities	2,843,660			2,733,193
Commitments and contingencies (Note 20)
Brandywine Realty Trust’s equity:
Preferred Shares (shares authorized-20,000,000):
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2013 and 2012	40			40
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 200,000,000; 156,731,993 and 143,538,733 issued and outstanding in 2013 and 2012, respectively	1,566			1,434
Additional paid-in capital	2,971,596			2,780,194
Deferred compensation payable in common shares	5,407			5,352
Common shares in grantor trust, 312,280 in 2013 and 290,745 in 2012	(5,407		)	(5,352		)
Cumulative earnings	522,528			479,734
Accumulated other comprehensive loss	(2,995		)	(15,918		)
Cumulative distributions	(1,592,515		)	(1,493,206		)
Total Brandywine Realty Trust’s equity	1,900,220			1,752,278
Non-controlling interests	21,215			21,238
Total beneficiaries' equity	1,921,435			1,773,516
Total liabilities and beneficiaries' equity	$	4,765,095		$	4,506,709

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

F- 3

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except share and per share information

	Years ended December 31,
	2013			2012			2011
Revenue:
Rents	$	461,387		$	437,560		$	441,329
Tenant reimbursements	79,087			77,060			77,404
Termination fees	4,497			3,233			2,951
Third party management fees, labor reimbursement and leasing	13,053			12,116			11,536
Other	4,186			5,710			5,348
Total revenue	562,210			535,679			538,568
Operating Expenses:
Property operating expenses	160,406			152,319			159,768
Real estate taxes	55,612			53,402			51,433
Third party management expenses	5,751			5,127			5,590
Depreciation and amortization	197,021			188,382			202,933
General and administrative expenses	27,628			25,413			24,602
Total operating expenses	446,418			424,643			444,326
Operating income	115,792			111,036			94,242
Other Income (Expense):
Interest income	1,044			3,008			1,810
Historic tax credit transaction income	11,853			11,840			12,026
Interest expense	(121,937		)	(132,939		)	(131,405		)
Interest expense — amortization of deferred financing costs	(4,676		)	(6,208		)	(4,991		)
Interest expense — financing obligation	(972		)	(850		)	—
Recognized hedge activity	—			(2,985		)	—
Equity in income of real estate ventures	3,664			2,741			3,775
Net gain from remeasurement of investments in real estate ventures	6,866			—			—
Net gain on sale of interests in real estate	—			—			2,985
Net loss on sale of undepreciated real estate	(137		)	—			—
Net gain (loss) on real estate venture transactions	29,604			(950		)	(222		)
Loss on early extinguishment of debt	(2,119		)	(22,002		)	(2,776		)
Income (loss) from continuing operations	38,982			(37,309		)	(24,556		)
Discontinued operations:
Income from discontinued operations	825			9,064			12,794
Net gain on disposition of discontinued operations	3,382			34,774			7,047
Total discontinued operations	4,207			43,838			19,841
Net income (loss)	43,189			6,529			(4,715		)
Net (income) from discontinued operations attributable to non-controlling interests — LP units	(55		)	(797		)	(778		)
Net (income) loss attributable to non-controlling interests — LP units	(357		)	863			994
Net (income) loss attributable to non-controlling interests	(412		)	66			216
Net income (loss) attributable to Brandywine Realty Trust	42,777			6,595			(4,499		)
Distribution to Preferred Shares	(6,900		)	(10,405		)	(7,992		)
Preferred share redemption charge	—			(4,052		)	—
Amount allocated to unvested restricted shareholders	(363		)	(376		)	(505		)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$	35,514		$	(8,238	)	$	(12,996	)
Basic income (loss) per Common Share:
Continuing operations	$	0.20		$	(0.36	)	$	(0.24	)
Discontinued operations	0.03			0.30			0.14
	$	0.23		$	(0.06	)	$	(0.10	)
Diluted income (loss) per Common Share:
Continuing operations	$	0.20		$	(0.36	)	$	(0.24	)
Discontinued operations	0.03			0.30			0.14
	$	0.23		$	(0.06	)	$	(0.10	)
Basic weighted average shares outstanding	153,140,458			143,257,097			135,444,424
Diluted weighted average shares outstanding	154,414,311			143,257,097			135,444,424
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	$	38,625		$	(36,446	)	$	(23,562	)
Income from discontinued operations	4,152			43,041			19,063
Net income (loss)	$	42,777		$	6,595		$	(4,499	)

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

F- 4

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Years ended December 31,
	2013			2012			2011
Net income (loss)	$	43,189		$	6,529		$	(4,715	)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	12,789			(7,338		)	(4,499		)
Settlement of interest rate swaps	—			(2,985		)	—
Reclassification of realized losses on derivative financial instruments to operations, net (1)	286			297			153
Total comprehensive income (loss)	13,075			(10,026		)	(4,346		)
Comprehensive income (loss)	56,264			(3,497		)	(9,061		)
Comprehensive income (loss) attributable to non-controlling interest	(564		)	261			427
Comprehensive income (loss) attributable to Brandywine Realty Trust	$	55,700		$	(3,236	)	$	(8,634	)

(1) Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

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

F- 5

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY

For the Years ended December 31, 2013, 2012 and 2011

(in thousands, except number of shares)

December 31, 2011

	Number of Preferred Shares	Par Value of Preferred Shares		Number of Common Shares		Number of Treasury Shares		Number of Rabbi Trust/Deferred Compensation Shares		Common Shares of Brandywine Realty Trust’s beneficial interest		Additional Paid-in Capital			Common Shares in Treasury			Deferred Compensation Payable in Common Shares			Common Shares in Grantor Trust			Cumulative Earnings			Accumulated Other Comprehensive Income (Loss)			Cumulative Distributions			Non-Controlling Interests			Total
December 31, 2010	4,300,000	$	43	134,601,796		116,679		291,281		$	1,343	$	2,671,217		$	(3,074	)	$	5,774		$	(5,774	)	$	483,439		$	(1,945	)	$	(1,301,521	)	$	128,272		$	1,977,774
Net loss																								(4,500		)							(215		)	(4,715		)
Comprehensive loss																											(4,134		)				(212		)	(4,346		)
Issuance of Common Shares of Beneficial Interest				679,285						7		8,265																								8,272
Equity Issuance Costs												(345		)																			(32		)	(377		)
Conversion of LP Units to Common Shares				7,204,104						72		85,966																					(86,038		)	—
Bonus Share Issuance						(463	)	463							12			6			(6		)	(6		)										6
Vesting of Restricted Shares				85,248		(116,216	)	9,043		1		(1,818		)	3,062									(1,595		)										(350		)
Restricted Share Amortization												2,937																								2,937
Restricted Performance Units Amortization												1,679																								1,679
Exercise of Share Options				120,179						1		349																								350
Share Option Amortization												1,487																								1,487
Outperformance Plan Amortization												123																								123
Share Issuance from/to Deferred Compensation Plan				(845	)			(8,141	)			(16		)				(149		)	149															(16		)
Share Choice Plan Issuance				(1,684	)							(55		)																						(55		)
Trustees Fees Paid in Shares				2,672								32																								32
Adjustment to Non-controlling Interest												6,376																					(6,376		)	—
Preferred Share distributions																														(7,992		)				(7,992		)
Distributions declared ($0.60 per share)																														(82,819		)	(2,294		)	(85,113		)
BALANCE, December 31, 2011	4,300,000	$	43	142,690,755		—		292,646		$	1,424	$	2,776,197		$	—		$	5,631		$	(5,631	)	$	477,338		$	(6,079	)	$	(1,392,332	)	$	33,105		$	1,889,696

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

F- 6

December 31, 2012

	Number of Preferred Shares		Par Value of Preferred Shares			Number of Common Shares		Number of Treasury Shares	Number of Rabbi Trust/Deferred Compensation Shares		Common Shares of Brandywine Realty Trust’s beneficial interest		Additional Paid-in Capital			Common Shares in Treasury		Deferred Compensation Payable in Common Shares			Common Shares in Grantor Trust			Cumulative Earnings			Accumulated Other Comprehensive Income (Loss)			Cumulative Distributions			Non-Controlling Interests			Total
BALANCE, December 31, 2011	4,300,000		$	43		142,690,755		—	292,646		$	1,424	$	2,776,197		$	—	$	5,631		$	(5,631	)	$	477,338		$	(6,079	)	$	(1,392,332	)	$	33,105		$	1,889,696
Net income																								6,595									(66		)	6,529
Comprehensive loss																											(9,839		)				(187		)	(10,026		)
Issuance of Preferred Shares	4,000,000		40										96,810																							96,850
Preferred Share Issuance Costs													(613		)																					(613		)
Redemption of Preferred Shares	(4,300,000	)	(43		)								(103,405		)																					(103,448		)
Conversion of LP Units to Common Shares						20,464					1		149											(49		)							(268		)	(167		)
Conversion of LP Units to Cash																								(4,185		)							(5,556		)	(9,741		)
Bonus Share Issuance						35,703							387																							387
Vesting of Restricted Shares						293,614			9,036		4		(1,389		)																					(1,385		)
Restricted Share Amortization													3,271																							3,271
Restricted Share Forfeitures																								35												35
Vesting of Restricted Performance Units						272,131					3		(1,498		)																					(1,495		)
Restricted Performance Units Amortization													3,379																							3,379
Exercise of Share Options						230,294					2		974																							976
Share Option Amortization													1,636																							1,636
Share Issuance from/to Deferred Compensation Plan						(5,564	)		(10,937	)								(279		)	279															—
Trustee Fees Paid in Shares						1,336							15																							15
Adjustment to Non-controlling Interest													4,281																				(4,281		)	—
Preferred Share distributions																														(10,405		)				(10,405		)
Preferred Share redemption charges																														(4,052		)				(4,052		)
Distributions declared ($0.60 per share)																														(86,417		)	(1,509		)	(87,926		)
BALANCE, December 31, 2012	4,000,000		$	40		143,538,733		—	290,745		$	1,434	$	2,780,194		$	—	$	5,352		$	(5,352	)	$	479,734		$	(15,918	)	$	(1,493,206	)	$	21,238		$	1,773,516

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

F- 7

December 31, 2013

	Number of Preferred Shares	Par Value of Preferred Shares		Number of Common Shares		Number of Rabbi Trust/Deferred Compensation Shares		Common Shares of Brandywine Realty Trust’s beneficial interest		Additional Paid-in Capital			Deferred Compensation Payable in Common Shares		Common Shares in Grantor Trust			Cumulative Earnings		Accumulated Other Comprehensive Income (Loss)			Cumulative Distributions			Non-Controlling Interests			Total
BALANCE, December 31, 2012	4,000,000	$	40	143,538,733		290,745		$	1,434	$	2,780,194		$	5,352	$	(5,352	)	$	479,734	$	(15,918	)	$	(1,493,206	)	$	21,238		$	1,773,516
Net income																		42,777								412			43,189
Comprehensive income																				12,923						152			13,075
Issuance of Common Shares of Beneficial Interest				12,650,000				127		181,907																			182,034
Issuance of Partnership Interest in Real Estate Venture																										946			946
Equity issuance costs										(744		)																	(744		)
Conversion of LP Units to Common Shares				81,998				1		1,239																(1,240		)	—
Bonus Share Issuance				27,918						361																			361
Vesting of Restricted Shares				147,495		7,050		2		(904		)																	(902		)
Restricted Share Amortization										3,079																			3,079
Vesting of Restricted Performance Units				53,134		27,067		1		(160		)																	(159		)
Restricted Performance Units Amortization										4,333																			4,333
Restricted Share Forfeitures																		17											17
Exercise of Stock Options				236,318				1		2,379																			2,380
Stock Option Amortization										670																			670
Share Issuance from/to Deferred Compensation Plan				(5,012	)	(12,583	)						55		(55		)												—
Trustee Fees Paid in Shares				1,409						20																			20
Adjustment to Non-controlling Interest										(778		)														778			—
Preferred Share distributions																							(6,900		)				(6,900		)
Distributions declared ($0.60 per share)																							(92,409		)	(1,071		)	(93,480		)
BALANCE, December 31, 2013	4,000,000	$	40	156,731,993		312,279		$	1,566	$	2,971,596		$	5,407	$	(5,407	)	$	522,528	$	(2,995	)	$	(1,592,515	)	$	21,215		$	1,921,435

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

F- 8

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Years ended December 31,
	2013			2012			2011
Cash flows from operating activities:
Net income (loss)	$	43,189		$	6,529		$	(4,715	)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	198,731			198,579			219,110
Amortization of deferred financing costs	4,676			6,208			4,991
Amortization of debt discount/(premium), net	2,480			1,760			1,567
Amortization of stock compensation costs	6,998			5,685			5,282
Shares used for employee taxes upon vesting of share awards	(1,062		)	(2,493		)	(1,012		)
Recognized hedge activity	—			2,985			—
Straight-line rent income	(20,136		)	(23,566		)	(20,298		)
Amortization of acquired above (below) market leases, net	(7,170		)	(6,084		)	(5,384		)
Straight-line ground rent expense	1,509			1,897			1,924
Provision for doubtful accounts	2,467			2,198			1,924
Net gain on sale of interests in real estate	(29,166		)	(34,774		)	(10,008		)
Loss on real estate venture formation	—			950			222
Net gain on real estate venture transaction	(3,683		)	—			—
Net gain from remeasurement of investment in a real estate venture	(6,866		)	—			—
Loss on early extinguishment of debt	2,119			22,002			2,776
Historic tax credit transaction income	(11,853		)	(11,840		)	(12,026		)
Real estate venture income in excess of distributions	(2,014		)	(1,517		)	(1,175		)
Cumulative interest accretion of repayments of unsecured notes	—			—			(4,005		)
Contributions from historic tax credit transaction, net of deferred costs	—			—			2,694
Deferred financing obligation	(974		)	(1,803		)	—
Changes in assets and liabilities:
Accounts receivable	(4,048		)	262			(856		)
Other assets	5,440			4,244			(3,851		)
Accounts payable and accrued expenses	(526		)	(8,355		)	7,732
Deferred income, gains and rent	3,758			(2,167		)	(7,220		)
Other liabilities	(385		)	(1,590		)	(425		)
Net cash from operating activities	183,484			159,110			177,247
Cash flows from investing activities:
Acquisition of properties	(161,604		)	(77,555		)	(40,674		)
Investments in available-for-sale securities	—			(105,250		)	—
Proceeds from the sale of available-for-sale securities	—			105,250			—
Sales of properties, net	423,480			170,918			155,956
Distribution of sales proceeds from real estate venture	16,963			—			—
Proceeds from repayment of mortgage notes receivable	200			23,364			—
Capital expenditures for tenant improvements	(109,357		)	(86,986		)	(130,482		)
Capital expenditures for redevelopments	(6,265		)	(11,964		)	(674		)
Capital expenditures for developments	(5,490		)	(162		)	—
Reimbursement from real estate venture for pre-formation development costs	1,976			—			—
Advances for purchase of tenant assets, net of repayments	(127		)	270			1,365
Loan proceeds received from an unconsolidated joint venture	—			566			1,388
Loan provided to an unconsolidated real estate venture partner	—			—			(1,122		)
Investment in unconsolidated Real Estate Ventures	(33,069		)	(65,354		)	(5,277		)
Escrowed cash	1,902			(1,827		)	1,502
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	7,496			5,109			10,316
Leasing costs	(31,397		)	(31,243		)	(38,461		)
Net cash from (used in) investing activities	104,708			(74,864		)	(46,163		)
Cash flows from financing activities:
Proceeds from Unsecured Term Loans	—			600,000			—
Proceeds from Credit Facility borrowings	186,000			90,500			706,002
Repayments of Credit Facility borrowings	(255,000		)	(297,000		)	(613,502		)
Repayments of mortgage notes payable	(11,268		)	(68,513		)	(221,856		)

F- 9

Proceeds from unsecured notes	—			248,183			321,448
Deferred financing obligation interest expense	—			935			—
Net proceeds from issuance of common shares	181,527			—			7,930
Net proceeds from issuance of preferred shares	—			96,237			—
Redemption of preferred shares	—			(108,536		)	—
Redemption of partnership units	—			(9,676		)	—
Repayments of unsecured notes	(31,369		)	(338,097		)	(105,381		)
Repayments of unsecured term loan	—			(190,485		)	(145,500		)
Net settlement of hedge transactions	—			—			(613		)
Debt financing costs	(355		)	(10,128		)	(4,249		)
Exercise of stock options	2,381			976			350
Distributions paid to shareholders	(97,367		)	(96,030		)	(89,559		)
Distributions to noncontrolling interest	(1,083		)	(1,473		)	(2,309		)
Net cash from (used in) financing activities	(26,534		)	(83,107		)	(147,239		)
Increase (decrease) in cash and cash equivalents	261,658			1,139			(16,155		)
Cash and cash equivalents at beginning of year	1,549			410			16,565
Cash and cash equivalents at end of year	$	263,207		$	1,549		$	410
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2013, 2012, and 2011 of $3,137, $2,560, and $1,997, respectively	$	118,714		$	137,823		$	135,210
Supplemental disclosure of non-cash activity:
				—			—
Change in operating real estate related to a non-cash acquisition of an operating property	(21,649		)	—			—
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,517		)	—			—
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	462			—			—
Change in investments in joint venture related to non-cash acquisition of property	13,040			—			—
Change in investments in joint venture related to non-cash disposition of property	(17,628		)	—			—
Change in operating real estate related to non-cash adjustment to land	7,752			—			—
Change in mortgage notes payable related to acquisition of an operating property	238,082			—			—
Change in investments in joint venture related to a contribution of land at period end	(6,058		)	(15,222		)	—
Change in investments in joint venture related to a contribution of services	—			(711		)	—
Change in capital expenditures financed through accounts payable at period end	11,703			7,059			(3,896		)
Change in capital expenditures financed through retention payable at period end	(204		)	566			(6,213		)
Change in unfunded tenant allowance	(969		)	(1,089		)	(1,717		)

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

F- 10

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED BALANCE SHEETS

(in thousands, except unit and per unit information)

	December 31, 2013			December 31, 2012
ASSETS
Real estate investments:
Operating properties	$	4,669,289		$	4,726,169
Accumulated depreciation	(983,808		)	(954,665		)
Operating real estate investments, net	3,685,481			3,771,504
Construction-in-progress	74,174			48,950
Land inventory	93,351			102,439
Total real estate investments, net	3,853,006			3,922,893
Cash and cash equivalents	263,207			1,549
Accounts receivable, net	17,389			13,232
Accrued rent receivable, net	126,295			122,066
Investment in real estate ventures, at equity	180,512			193,555
Deferred costs, net	122,954			122,243
Intangible assets, net	132,329			70,620
Notes receivable	7,026			7,226
Other assets	62,377			53,325
Total assets	$	4,765,095		$	4,506,709
LIABILITIES AND PARTNERS' EQUITY
Mortgage notes payable	$	670,151		$	442,974
Unsecured credit facility	—			69,000
Unsecured term loans	450,000			450,000
Unsecured senior notes, net of discounts	1,475,230			1,503,356
Accounts payable and accrued expenses	83,693			71,579
Distributions payable	25,584			23,652
Deferred income, gains and rent	71,635			82,947
Acquired lease intangibles, net	34,444			33,859
Other liabilities	32,923			55,826
Total liabilities	2,843,660			2,733,193
Commitments and contingencies (Note 20)
Redeemable limited partnership units at redemption value; 1,763,739 and 1,845,737 issued and outstanding in 2013 and 2012, respectively	26,486			26,777
Brandywine Operating Partnership, L.P.’s equity:
6.90% Series E-Linked Preferred Mirror Units; issued and outstanding- 4,000,000 in 2013 and 2012	96,850			96,850
General Partnership Capital, 156,731,993 and 143,538,733 units issued and outstanding in 2013 and 2012, respectively	1,800,530			1,666,341
Accumulated other comprehensive loss	(3,377		)	(16,452		)
Total Brandywine Operating Partnership, L.P.’s equity	1,894,003			1,746,739
Non-controlling interest — consolidated real estate ventures	946			—
Total parters' equity	1,894,949			1,746,739
Total liabilities and partners’ equity	$	4,765,095		$	4,506,709

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

F- 11

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except unit and per unit information)

	Years ended December 31,
	2013			2012			2011
Revenue:
Rents	$	461,387		$	437,560		$	441,329
Tenant reimbursements	79,087			77,060			77,404
Termination fees	4,497			3,233			2,951
Third party management fees, labor reimbursement and leasing	13,053			12,116			11,536
Other	4,186			5,710			5,348
Total revenue	562,210			535,679			538,568
Operating Expenses:
Property operating expenses	160,406			152,319			159,768
Real estate taxes	55,612			53,402			51,433
Third party management expenses	5,751			5,127			5,590
Depreciation and amortization	197,021			188,382			202,933
General & administrative expenses	27,628			25,413			24,602
Total operating expenses	446,418			424,643			444,326
Operating income	115,792			111,036			94,242
Other Income (Expense):
Interest income	1,044			3,008			1,810
Historic tax credit transaction income	11,853			11,840			12,026
Interest expense	(121,937		)	(132,939		)	(131,405		)
Interest expense — amortization of deferred financing costs	(4,676		)	(6,208		)	(4,991		)
Interest expense — financing obligation	(972		)	(850		)	—
Recognized hedge activity	—			(2,985		)	—
Equity in income of real estate ventures	3,664			2,741			3,775
Net gain from remeasurement of investments in real estate ventures	6,866			—			—
Net gain (loss) on sale of interests in real estate	—			—			2,985
Net loss on sale of undepreciated real estate	(137		)	—			—
Net gain (loss) on real estate venture transactions	29,604			(950		)	(222		)
Loss on early extinguishment of debt	(2,119		)	(22,002		)	(2,776		)
Income loss from continuing operations	38,982			(37,309		)	(24,556		)
Discontinued operations:
Income from discontinued operations	825			9,064			12,794
Net gain on disposition of discontinued operations	3,382			34,774			7,047
Total discontinued operations	4,207			43,838			19,841
Net income (loss)	43,189			6,529			(4,715		)
Distribution to Preferred Units	(6,900		)	(10,405		)	(7,992		)
Preferred unit redemption charge	—			(4,052		)	—
Amount allocated to unvested restricted unitholders	(363		)	(376		)	(505		)
Net income (loss )attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$	35,926		$	(8,304	)	$	(13,212	)
Basic income (loss) per Common Partnership Unit:
Continuing operations	$	0.20		$	(0.36	)	(0.23		)
Discontinued operations	0.03			0.30			0.14
	$	0.23		$	(0.06	)	$	(0.09	)
Diluted income (loss) per Common Partnership Unit:
Continuing operations	$	0.20		$	(0.36	)	$	(0.23	)
Discontinued operations	0.03			0.30			0.14
	$	0.23		$	(0.06	)	$	(0.09	)
Basic weighted average common partnership units outstanding	154,929,545			145,883,217			145,118,841
Diluted weighted average common partnership units outstanding	156,203,398			145,883,217			145,118,841
Net income (loss) attributable to Brandywine Operating Partnership, L.P.
Loss from continuing operations	$	38,982		$	(37,309	)	$	(24,556	)
Income from discontinued operations	4,207			43,838			19,841
Net income (loss)	$	43,189		$	6,529		$	(4,715	)

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

F- 12

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Years ended December 31,
	2013		2012			2011
Net income (loss)	$	43,189	$	6,529		$	(4,715	)
Comprehensive income (loss):
Unrealized income (loss) on derivative financial instruments	12,789		(7,338		)	(4,499		)
Settlement of interest rate swaps	—		(2,985		)	—
Reclassification of realized losses on derivative financial instruments to operations, net (1)	286		297			153
Total comprehensive income (loss)	13,075		(10,026		)	(4,346		)
Comprehensive income (loss) attributable to Brandywine Operating Partnership, L.P.	$	56,264	$	(3,497	)	$	(9,061	)

(1) Amounts reclassified from comprehensive income to interest expense within the Consolidated Statement of Operations.

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

F- 13

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY

For the Years ended December 31, 2013, 2012 and 2011

(in thousands, except Units)

	Series D Preferred Mirror Units		Series E Preferred Mirror Units			Series E-Linked Preferred Mirror Units		General Partner Capital					Accumulated Other Comprehensive Income			Non-controlling Interest Consolidated Real Estate Ventures		Total Partners’ Equity
	Units	Amount	Units	Amount		Units	Amount	Units		Amount
BALANCE, December 31, 2010	2,000,000	47,912	2,300,000	55,538		—	—	134,485,117		1,743,549			(2,080		)	—		1,844,919
Net loss	—	—	—	—		—	—	—		(4,715		)	—			—		(4,715		)
Other comprehensive loss	—	—	—	—		—	—	—		—			(4,346		)	—		(4,346		)
Deferred compensation obligation	—	—	—	—		—	—	(845	)	(16		)	—			—		(16		)
Issuance of LP Units	—	—	—	—		—	—	679,285		8,272			—			—		8,272
Bonus share issuance	—	—	—	—		—	—	463		6			—			—		6
Conversion of LP Units to common shares	—	—	—	—		—	—	7,204,104		86,038			—			—		86,038
Share choice plan issuance	—	—	—	—		—	—	(1,684	)	(55		)	—			—		(55		)
Vesting of restricted units	—	—	—	—		—	—	201,464		(352		)	—			—		(352		)
Restricted stock amortization	—	—	—	—		—	—	—		2,937			—			—		2,937
Restricted performance units amortization	—	—	—	—		—	—	—		1,679			—			—		1,679
Outperformance plan amortization	—	—	—	—		—	—	—		123			—			—		123
Option amortization	—	—	—	—		—	—	—		1,487			—			—		1,487
Trustee fees paid in shares	—	—	—	—		—	—	2,672		32			—			—		32
Exercise of options	—	—	—	—		—	—	120,179		350			—			—		350
Adjustment of redeemable partnership units to liquidation value at period end	—	—	—	—		—	—	—		5,778			—			—		5,778
Distributions to Preferred Mirror Units	—	—	—	—		—	—	—		(7,992		)	—			—		(7,992		)
Distributions to general partnership unitholders	—	—	—	—		—	—	—		(82,819		)	—			—		(82,819		)
BALANCE, December 31, 2011	2,000,000	47,912	2,300,000	$	55,538	—	—	142,690,755		$	1,754,302		$	(6,426	)	$	—	$	1,851,326

F- 14

	Series D Preferred Mirror Units					Series E Preferred Mirror Units					Series E-Linked Preferred Mirror Units			General Partner Capital					Accumulated Other Comprehensive Income			Non-controlling Interest Consolidated Real Estate Ventures		Total Partners’ Equity
	Units		Amount			Units		Amount			Units	Amount		Units		Amount
Net income	—		—			—		—			—	—		—		6,529			—			—		6,529
Other comprehensive loss	—		—			—		—			—	—		—		—			(10,026		)	—		(10,026		)
Deferred compensation obligation	—		—			—		—			—	—		(5,564	)	—			—			—		—
Issuance of preferred units	—		—			—		—			4,000,000	96,850		—		—			—			—		96,850
Preferred unit issuance costs	—		—			—		—			—	—		—		(613		)	—			—		(613		)
Redemption of preferred units	(2,000,000	)	(47,912		)	(2,300,000	)	(55,538		)	—	—		—		—			—			—		(103,450		)
Bonus share issuance	—		—			—		—			—	—		35,703		387			—			—		387
Conversion of LP Units to common units	—		—			—		—			—	—		20,464		(49		)	—			—		(49		)
Conversion of LP Units to cash	—		—			—		—			—	—		—		(9,741		)	—			—		(9,741		)
Vesting of restricted units	—		—			—		—			—	—		293,614		(1,385		)	—			—		(1,385		)
Restricted stock amortization	—		—			—		—			—	—		—		3,271			—			—		3,271
Restricted stock forfeitures	—		—			—		—			—	—		—		35			—			—		35
Vesting of restricted performance units	—		—			—		—			—	—		272,131		(1,495		)	—			—		(1,495		)
Restricted performance units amortization	—		—			—		—			—	—		—		3,379			—			—		3,379
Option amortization	—		—			—		—			—	—		—		1,636			—			—		1,636
Trustee fees paid in shares	—		—			—		—			—	—		1,336		15			—			—		15
Exercise of options	—		—			—		—			—	—		230,294		976			—			—		976
Adjustment of redeemable partnership units to liquidation value at period end	—		—			—		—			—	—		—		9,968			—			—		9,968
Distributions to Preferred Mirror Units	—		—			—		—			—	—		—		(10,405		)	—			—		(10,405		)
Preferred Mirror Units redemption charges	—		—			—		—			—	—		—		(4,052		)	—			—		(4,052		)
Distributions to general partnership unitholders	—		—			—		—			—	—		—		(86,417		)	—			—		(86,417		)
BALANCE, December 31, 2012	—		$	—		—		$	—		4,000,000	$	96,850	143,538,733		$	1,666,341		$	(16,452	)	$	—	$	1,746,739

F- 15

	Series D Preferred Mirror Units			Series E Preferred Mirror Units			Series E-Linked Preferred Mirror Units			General Partner Capital					Accumulated Other Comprehensive Income			Non-controlling Interest Consolidated Real Estate Ventures		Total Partners’ Equity
	Units	Amount		Units	Amount		Units	Amount		Units		Amount
Net income	—	—		—	—		—	—		—		43,189			—			—		43,189
Other comprehensive income	—	—		—	—		—	—		—		—			13,075			—		13,075
Deferred compensation obligation	—	—		—	—		—	—		(5,012	)	—			—			—		—
Issuance of LP Units	—	—		—	—		—	—		12,650,000		181,289			—			—		181,289
Issuance of partnership interest in joint venture	—	—		—	—		—	—		—		—			—			946		946
Bonus share issuance	—	—		—	—		—	—		27,918		361			—			—		361
Conversion of LP Units to common shares	—	—		—	—		—	—		81,998		1,240			—			—		1,240
Vesting of restricted units	—	—		—	—		—	—		147,495		(902		)	—			—		(902		)
Restricted stock amortization	—	—		—	—		—	—		—		3,079			—			—		3,079
Restricted stock forfeitures	—	—		—	—		—	—		—		17			—			—		17
Vesting of restricted performance units	—	—		—	—		—	—		53,134		(160		)	—			—		(160		)
Restricted performance units amortization	—	—		—	—		—	—		—		4,333			—			—		4,333
Outperformance plan amortization	—	—		—	—		—	—		—		—			—			—		—
Option amortization	—	—		—	—		—	—		—		670			—			—		670
Trustee fees paid in shares	—	—		—	—		—	—		1,409		20			—			—		20
Exercise of options	—	—		—	—		—	—		236,318		2,380			—			—		2,380
Adjustment of redeemable partnership units to liquidation value at period end	—	—		—	—		—	—		—		(778		)	—			—		(778		)
Redemption value of limited partnership units	—	—		—	—		—	—		—		(1,240		)	—			—		(1,240		)
Cumulative effect of accounting change for variable interest entities	—	—		—	—		—	—		—		—			—			—		—
Distributions to Preferred Mirror Units	—	—		—	—		—	—		—		(6,900		)	—			—		(6,900		)
Distributions to general partnership unitholders	—	—		—	—		—	—		—		(92,409		)	—			—		(92,409		)
BALANCE, December 31, 2013	—	$	—	—	$	—	4,000,000	$	96,850	156,731,993		$	1,800,530		$	(3,377	)	$	946	$	1,894,949

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

F- 16

BRANDYWINE OPERATING PARTNERSHIP L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	For the year ended December 31,
	2013			2012			2011
Cash flows from operating activities:
Net income (loss)	$	43,189		$	6,529		$	(4,715	)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	198,731			198,579			219,110
Amortization of deferred financing costs	4,676			6,208			4,991
Amortization of debt discount/(premium), net	2,480			1,760			1,567
Amortization of stock compensation costs	6,998			5,685			5,282
Shares used for employee taxes upon vesting of share awards	(1,062		)	(2,493		)	(1,012		)
Recognized hedge activity	—			2,985			—
Straight-line rent income	(20,136		)	(23,566		)	(20,298		)
Amortization of acquired above (below) market leases, net	(7,170		)	(6,084		)	(5,384		)
Straight-line ground rent expense	1,509			1,897			1,924
Provision for doubtful accounts	2,467			2,198			1,924
Net gain on sale of interests in real estate	(29,166		)	(34,774		)	(10,008		)
Loss on real estate venture formation	—			950			222
Net gain on real estate venture transaction	(3,683		)	—			—
Gain from remeasurement of investment in a real estate venture	(6,866		)	—			—
Loss on early extinguishment of debt	2,119			22,002			2,776
Historic tax credit transaction income	(11,853		)	(11,840		)	(12,026		)
Real estate venture income in excess of distributions	(2,014		)	(1,517		)	(1,175		)
Cumulative interest accretion of repayments of unsecured notes	—			—			(4,005		)
Contributions from historic tax credit transaction, net of deferred costs	—			—			2,694
Deferred financing obligation	(974		)	(1,803		)	—
Changes in assets and liabilities:
Accounts receivable	(4,048		)	262			(856		)
Other assets	5,440			4,244			(3,851		)
Accounts payable and accrued expenses	(526		)	(8,355		)	7,732
Deferred income, gains and rent	3,758			(2,167		)	(7,220		)
Other liabilities	(385		)	(1,590		)	(425		)
Net cash from operating activities	183,484			159,110			177,247
Cash flows from investing activities:
Acquisition of properties	(161,604		)	(77,555		)	(40,674		)
Investments in available-for-sale securities	—			(105,250		)	—
Proceeds from sale of available-for-sale securities	—			105,250			—
Sales of properties, net	423,480			170,918			155,956
Distribution of sales proceeds from real estate venture	16,963			—			—
Proceeds from repayment of mortgage notes receivable	200			23,364			—
Capital expenditures for tenant improvements	(109,357		)	(86,986		)	(130,482		)
Capital expenditures for redevelopments	(6,265		)	(11,964		)	(674		)
Capital expenditures for developments	(5,490		)	(162		)	—
Reimbursement from real estate venture for pre-formation development costs	1,976			—			—
Advances for purchase of tenant assets, net of repayments	(127		)	270			1,365
Loan proceeds received from an unconsolidated joint venture	—			566			1,388
Loan provided to an unconsolidated real estate venture partner	—			—			(1,122		)
Investment in unconsolidated Real Estate Ventures	(33,069		)	(65,354		)	(5,277		)
Escrowed cash	1,902			(1,827		)	1,502
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	7,496			5,109			10,316
Leasing costs	(31,397		)	(31,243		)	(38,461		)
Net cash from (used in) investing activities	104,708			(74,864		)	(46,163		)
Cash flows from financing activities:
Proceeds from Unsecured Term Loans	—			600,000			—
Proceeds from Credit Facility borrowings	186,000			90,500			706,002
Repayments of Credit Facility borrowings	(255,000		)	(297,000		)	(613,502		)
Repayments of mortgage notes payable	(11,268		)	(68,513		)	(221,856		)

F- 17

Proceeds from unsecured notes	—			248,183			321,448
Deferred financing obligation interest expense	—			935			—
Net proceeds from issuance of common units	181,527			—			7,930
Net proceeds from issuance of preferred units	—			96,237			—
Redemption of preferred units	—			(108,536		)	—
Redemption of partnership units	—			(9,676		)	—
Repayments of unsecured notes	(31,369		)	(338,097		)	(105,381		)
Repayments of unsecured term loan	—			(190,485		)	(145,500		)
Net settlement of hedge transactions	—			—			(613		)
Debt financing costs	(355		)	(10,128		)	(4,249		)
Refund of deferred financing costs related to forward commitment	—			—			—
Exercise of unit options	2,381			976			350
Distributions paid to preferred and common partnership unitholders	(98,450		)	(97,503		)	(91,868		)
Net cash from (used in) financing activities	(26,534		)	(83,107		)	(147,239		)
Increase (decrease) in cash and cash equivalents	261,658			1,139			(16,155		)
Cash and cash equivalents at beginning of year	1,549			410			16,565
Cash and cash equivalents at end of year	$	263,207		$	1,549		$	410
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2013, 2012, and 2011 of $3,137, $2,560, and $1,997, respectively	$	118,714		$	137,823		$	135,210
Supplemental disclosure of non-cash activity:
Change in operating real estate related to a non-cash acquisition of an operating property	(21,649		)	—			—
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,517		)	—			—
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	462			—			—
Change in investments in joint venture related to non-cash acquisition of property	13,040			—			—
Change in investments in joint venture related to non-cash disposition of property	(17,628		)	—			—
Change in operating real estate related to non-cash adjustment to land	7,752			—			—
Change in mortgage notes payable related to acquisition of an operating property	238,082			—			—
Change in investments in joint venture related to a contribution of land at period end	(6,058		)	(15,222		)	—
Change in investments in joint venture related to a contribution of services	—			(711		)	—
Change in capital expenditures financed through accounts payable at period end	11,703			7,059			(3,896		)
Change in capital expenditures financed through retention payable at period end	(204		)	566			(6,213		)
Change in unfunded tenant allowance	(969		)	(1,089		)	(1,717		)

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

F- 18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

DECEMBER 31, 2013, 2012, AND 2011

1. ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP

The Parent Company is a self-administered and self-managed real estate investment trust (“REIT”) that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office and industrial properties. The Parent Company owns its assets and conducts its operations through the Operating Partnership and subsidiaries of the Operating Partnership. The Parent Company is the sole general partner of the Operating Partnership and, as of December 31, 2013, owned a 98.8% interest in the Operating Partnership. The Parent Company’s common shares of beneficial interest are publicly traded on the New York Stock Exchange under the ticker symbol “BDN”.

As of December 31, 2013, the Company owned 204 properties, consisting of 176 office properties, 19 industrial facilities, five mixed-use properties, one development property, two redevelopment properties and one re-entitlement property (collectively, the “Properties”) containing an aggregate of approximately 24.8 million net rentable square feet. In addition, as of December 31, 2013, the Company owned economic interests in 17 unconsolidated real estate ventures that contain approximately 5.7 million net rentable square feet (collectively, the “Real Estate Ventures”). As of December 31, 2013, the Company also owned 432 acres of undeveloped land, and held options to purchase approximately 51 additional acres of undeveloped land. As of December 31, 2013, the total potential development that these land parcels could support, under current zoning, entitlements or combination thereof, amounted to 6.8 million square feet. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord and Carlsbad, California. In addition to managing properties that the Company owns, as of December 31, 2013, the Company was managing approximately 7.9 million net rentable square feet of office and industrial properties for third parties and the Real Estate Ventures.

All references to building square footage, acres, occupancy percentage and the number of buildings are unaudited.

The Company conducts its third-party real estate management services business primarily through six management companies (collectively, the “Management Companies”): Brandywine Realty Services Corporation (“BRSCO”), BTRS, Inc. (“BTRS”), Brandywine Properties I Limited, Inc. (“BPI”), BDN Brokerage, LLC (“BBL”), Brandywine Properties Management, L.P. (“BPM”) and Brandywine Brokerage Services, LLC (“BBS”). Each of BRSCO, BTRS and BPI is a taxable REIT subsidiary. As of December 31, 2013, the Operating Partnership owns, directly and indirectly, 100% of each of BRSCO, BTRS, BPI, BBL, BPM and BBS. As of December 31, 2013, the Management Companies were managing properties containing an aggregate of approximately 32.7 million net rentable square feet, of which approximately 24.8 million net rentable square feet related to Properties owned by the Company and approximately 7.9 million net rentable square feet related to properties owned by third parties and Real Estate Ventures.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Reclassifications

Certain amounts have been reclassified in prior years to conform to the current year presentation. The reclassifications are related to the treatment of sold properties as discontinued operations on the statement of operations for all periods presented. In addition, capital expenditures included in investing activities were disaggregated on the statement of cash flows for all periods presented to the following; (i) capital expenditures for tenant improvements, (ii) capital expenditures for redevelopment projects and (iii) capital expenditures for development projects.

Principles of Consolidation

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity (“VIE”), and if the Company is deemed to be the primary beneficiary, in accordance with the accounting standard for the consolidation of variable interest entities. The accounting standard for the consolidation of VIEs requires the Company to qualitatively assess if the Company was the primary beneficiary of the VIEs based on whether the Company had (i) the power to direct those matters that most significantly impacted the activities of the VIE and (ii) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. For entities determined to be VIEs, but for which the Company is not the primary beneficiary, the Company's maximum exposure to loss is the carrying amount of its investments. As of December 31, 2013, the Company has provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million

F- 19

payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII.

When an entity is not deemed to be a VIE, the Company considers the provisions of the same accounting standard to determine whether a general partner/managing member, or the general partners/managing members as a group, controls a limited partnership or similar entity when the limited partners/non-managing members have certain rights. The Company consolidates (i) entities that are VIEs and of which the Company is deemed to be the primary beneficiary and (ii) entities that are non-VIEs and controlled by the Company and in which the limited partners neither have the ability to dissolve the entity or remove the Company without cause nor any substantive participating rights.  Entities that the Company accounts for under the equity method (i.e., at cost, increased or decreased by the Company's share of earnings or losses, plus contributions, less distributions) include (i) entities that are VIEs and of which the Company is not deemed to be the primary beneficiary (ii) entities that are non-VIEs which the Company does not control, but over which the Company has the ability to exercise significant influence and (iii) entities that are non-VIEs for which the Company maintains an ownership interest through its general partner/managing member status, but the limited partners/non-managing members in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights.  Currently there are no real estate ventures that a limited partner/non-managing member has the unilateral right to dissolve. The Company continuously assesses its determination of whether an entity is a VIE and who the primary beneficiary is, and whether or not the limited partners/non-managing members in an entity have substantive rights, more particularly if certain events occur that are likely to cause a change in the original determinations. The Company's assessment includes a review of applicable documents such as, but not limited to, applicable partnership agreements, LLC and other real estate venture agreements and management and leasing agreements to determine whether the Company has control to direct the business activities of the entities. The portion of the consolidated entities that is not owned by the Company is presented as non-controlling interest as of and during the periods consolidated. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Management makes significant estimates regarding revenue, valuation of real estate and related intangible assets and liabilities, impairment of long-lived assets, allowance for doubtful accounts and deferred costs.

Operating Properties

Operating properties are carried at historical cost less accumulated depreciation and impairment losses. The cost of operating properties reflects their purchase price or development cost. Acquisition costs related to business combinations are expensed as incurred, whereas the costs related to asset acquisitions are capitalized as incurred. Costs incurred for the renovation and betterment of an operating property are capitalized to the Company’s investment in that property. 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. Fully-depreciated assets are removed from the accounts.

Purchase Price Allocation

The Company allocates the purchase price of properties considered to be business combinations to net tangible and identified intangible assets acquired based on fair values. Above-market and below-market in-place lease values for acquired properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) the Company’s estimate of the fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease (including the below market fixed renewal period, if applicable). Capitalized above-market lease values are amortized as a reduction of rental income over the remaining non-cancelable terms of the respective leases. Capitalized below-market lease values are amortized as an increase to rental income over the remaining non-cancelable terms of the respective leases, including any below market fixed-rate renewal periods.

Other intangible assets also include in-place leases based on the Company’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. The Company estimates the cost to execute leases with terms similar to the remaining lease terms of the in-place leases, including leasing commissions, legal and other related expenses. This intangible asset is amortized to expense over the remaining term of the respective leases and any fixed-rate bargain renewal periods. Company estimates of value are made using methods similar to those used by independent appraisers or by using independent appraisals. Factors considered by the Company in this analysis include an estimate of the carrying costs during the

F- 20

expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, which primarily range from four to twelve months. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired. The Company also uses the information obtained as a result of its pre-acquisition due diligence as part of its consideration of the accounting standard governing asset retirement obligations and when necessary, will record a conditional asset retirement obligation as part of its purchase price. Though the Company considers the value of tenant relationships, the amounts are determined on a tenant-specific basis. On certain of our acquisitions this intangible has been deemed immaterial. In these instances no related intangible value is assigned.

In the event that a tenant terminates its lease, the unamortized portion of each intangible, including in-place lease values and tenant relationship values, is charged to expense and market rate adjustments (above or below) are recorded to revenue.

Depreciation and Amortization

The costs of buildings and improvements are depreciated using the straight-line method based on the following useful lives: buildings and improvements (five to 55 years) and tenant improvements (the shorter of the lease term or the life of the asset).

The Company's 2011 consolidated statement of operations contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million in 2011. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error during 2011 was not material to the Company's consolidated financial statements, the Company recorded the related adjustment during 2011.

Construction in Progress

Project costs directly associated with the development and construction of a real estate project are capitalized as construction in progress. Construction in progress also includes costs related to ongoing tenant improvement projects. In addition, interest, real estate taxes and other expenses that are directly associated with the Company’s development activities are capitalized until the property is placed in service. Internal direct costs are capitalized to projects in which qualifying expenditures are being incurred. Internal direct construction costs totaling $3.7 million in 2013, $4.7 million in 2012, $4.0 million in 2011 and interest totaling $2.6 million in 2013, $2.6 million in 2012, and $2.0 million in 2011 were capitalized related to development of certain properties and land holdings.

During the years ended December 31, 2013, 2012 and 2011, the Company's internal direct construction costs are comprised entirely of capitalized salaries. The following table shows the amount of compensation costs (including bonuses and benefits) capitalized for the years presented (in thousands):

	December 31,
	2013		2012		2011
Development	$	156	$	57	$	—
Redevelopment	194		353		—
Tenant Improvements	3,323		4,259		4,034
Total	$	3,673	$	4,669	$	4,034

Impairment or Disposal of Long-Lived Assets

The Company reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. In such case, an impairment loss is recognized in the amount of the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our holding strategy were to change or if market conditions

F- 21

were to otherwise dictate an earlier sale date, then an impairment loss may be recognized and such loss could be material. If we determine that impairment has occurred, the affected assets must be reduced to their fair value.

The relevant accounting guidance for impairments requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and if we will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally consider assets to be “held for sale” when the transaction has been approved by our Board of Trustees, or by officers vested with authority to approve the transaction and there are no known significant contingencies relating to the sale of the property within one year of the consideration date and the consummation of the transaction is otherwise considered probable.

Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value.

The Company determined during its impairment review of the year-ended December 31,2013, 2012 and 2011, that no impairment charges were necessary.

Cash and Cash Equivalents

Cash and cash equivalents are highly-liquid investments with original maturities of three months or less. The Company maintains cash equivalents in financial institutions in excess of insured limits, but believes this risk is mitigated by only investing in or through major financial institutions.

Restricted Cash

Restricted cash consists of cash held as collateral to provide credit enhancement for the Company’s mortgage debt, cash for property taxes, capital expenditures and tenant improvements.

Accounts Receivable and Accrued Rent Receivable

Leases with tenants are accounted for as operating leases. Minimum annual rentals under tenant leases are recognized on a straight-line basis over the term of the related lease. The cumulative difference between lease revenue recognized under the straight-line method and contractual lease payment terms is recorded as “accrued rent receivable, net” on the accompanying balance sheets. Included in current tenant receivables are tenant reimbursements which are comprised of amounts recoverable from tenants for common area maintenance expenses and certain other recoverable expenses that are recognized as revenue in the period in which the related expenses are incurred. As of December 31, 2013 and 2012, no tenant represented more than 10% of accounts receivable and accrued rent receivable.

Tenant receivables and accrued rent receivables are carried net of the allowances for doubtful accounts of $3.2 million and $13.0 million in 2013, respectively and $3.1 million and $13.5 million in 2012, respectively. The allowance is an estimate based on two calculations that are combined to determine the total amount reserved. First, the Company evaluates specific accounts where it has determined that a tenant may have an inability to meet its financial obligations. In these situations, the Company uses its judgment, based on the facts and circumstances, and records a specific reserve for that tenant against amounts due to reduce the receivable to the amount that the Company expects to collect. These reserves are reevaluated and adjusted as additional information becomes available. Second, a reserve is established for all tenants based on a range of percentages applied to receivable aging categories for tenant receivables. For accrued rent receivables, the Company considers the results of the evaluation of specific accounts and also considers other factors including assigning risk factors to different industries based on its tenants SIC classification. Considering various factors including assigning a risk factor to different industries, these percentages are based on historical collection and write-off experience adjusted for current market conditions, which requires management’s judgments.

Investments in Unconsolidated Real Estate Ventures

The Company accounts for its investments in unconsolidated Real Estate Ventures under the equity method of accounting as it is not the primary beneficiary (for VIEs) and the Company exercises significant influence, but does not control these entities under the provisions of the entities’ governing agreements pursuant to the accounting standard for the consolidation of VIEs. When the Company determines that its investment in an unconsolidated Real Estate Venture does not constitute a VIE, the Company utilizes the voting interest model under the accounting standard for consolidation to determine whether to consolidate the venture.

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Under the equity method, investments in unconsolidated Real Estate Ventures are recorded initially at cost, as investments in Real Estate Ventures, and subsequently adjusted for equity in earnings, cash contributions, less distributions and impairments. On a periodic basis, management also assesses whether there are any indicators that the value of the Company’s investments in unconsolidated Real Estate Ventures may be other than temporarily impaired. An investment is impaired only if the value of the investment, as estimated by management, is less than the carrying value of the investment and the decline is other than temporary. To the extent that an impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

When the Company acquires an interest in or contributes assets to a real estate venture project, the difference between the Company’s cost basis in the investment and the value of the real estate venture or asset contributed is amortized over the life of the related assets, intangibles and liabilities and such adjustment is included in the Company’s share of equity in income of unconsolidated Real Estate Ventures. For purposes of cash flow presentation, distributions from unconsolidated Real Estate Ventures are presented as part of operating activities when they are considered as return on investments. Distributions in excess of the Company’s share in the cumulative unconsolidated Real Estate Ventures’ earnings are considered as return of investments and are presented as part of investing activities in accordance with the accounting standard for cash flow presentation.

Deferred Costs

Costs incurred in connection with property leasing are capitalized as deferred leasing costs. Deferred leasing costs consist primarily of leasing commissions and internal leasing costs that are amortized using the straight-line method over the life of the respective lease which generally ranges from one to 15 years. Management re-evaluates the remaining useful lives of leasing costs as economic and market conditions change.

Costs incurred in connection with debt financing are capitalized as deferred financing costs and charged to interest expense over the terms of the related debt agreements. Deferred financing costs consist primarily of loan fees which are amortized over the related loan term on a basis that approximates the effective interest method. Deferred financing costs are accelerated, when debt is extinguished, as part of interest expense- amortization of deferred financing costs within the Company's consolidated statements of operations. Original issue discounts are recognized as part of the gain or loss on extinguishment of debt, as appropriate.

Notes Receivable

As of December 31, 2013 and 2012, notes receivable included a purchase money mortgage with a 20-year amortization period bearing interest at 8.5%, which was valued at $7.0 million and $7.2 million, respectively. The borrower had previously defaulted on the note. As a result, a forbearance agreement dated October 2011, as amended by a second forbearance agreement dated July 9, 2013, was entered into between the Company and the borrower, outlining the repayment terms of the outstanding debt. The Company has determined that the loan modifications represent a troubled debt restructuring due to the fact that the borrower was considered to be in a financial difficulty when it defaulted on the mortgage debt, and that a concession was granted in the form of the forbearance agreements. In accordance with the accounting standard for loan receivables the Company performs, on an ongoing basis, a collectability assessment of the note using the expected cash flow information provided by the borrower. Based on settlements subsequent to the balance sheet date and future cash flow projections provided by the borrower, it is anticipated that the note will be fully paid during 2015. As of December 31, 2013, the present value of the expected cash flows of the note receivable exceeded the outstanding balance of the note and therefore the note is considered recoverable as of December 31, 2013.

During 2012, the $23.5 million seven year purchase money mortgage note receivable (balance as of the payment date, including accrued but unpaid interest), which related to the 2009 sale of two Trenton properties, was paid in full prior to its scheduled maturity of October 2016. The Company also recognized a $12.9 million deferred gain and $1.0 million of interest income at the time of payment, in accordance with the accounting standard for installment sales.

Revenue Recognition

Rental revenue is recognized on the straight-line basis, which averages minimum rents over the terms of the leases from the later of the date of the commencement of the lease or the date of acquisition of the property subject to existing leases. The straight-line rent adjustment increased revenue by approximately $17.7 million in 2013, $21.1 million in 2012 and $17.9 million in 2011. Deferred rents on the balance sheet represent rental revenue received prior to their due dates and amounts paid by the tenant for certain improvements considered to be landlord assets that will remain as the Company’s property at the end of the tenant’s lease term. The amortization of the amounts paid by the tenant for such improvements is calculated on a straight-line basis over the term of the tenant’s lease and is a component of straight-line rental income and increased revenue by $2.4 million in each of 2013, 2012 and 2011. Lease incentives, which are included as reductions of rental revenue in the accompanying consolidated statements

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of operations, are recognized on a straight-line basis over the term of the lease. Lease incentives decreased revenue by $0.7 million in 2013, $0.8 million in 2012, and $1.6 million in 2011.

The Company's leases also typically provide for tenant reimbursement of a portion of common area maintenance expenses and other operating expenses to the extent that a tenant’s pro rata share of expenses exceeds a base year level set in the lease or to the extent that the tenant has a lease on a triple net basis. For certain leases, the Company makes significant assumptions and judgments in determining the lease term, including assumptions when the lease provides the tenant with an early termination option. The lease term impacts the period over which the Company determines and records minimum rents and also impacts the period over which the Company amortizes lease-related costs.

In addition, the Company's rental revenue is impacted by the Company's determination of whether improvements to the properties, whether made by the Company or by the tenant, are landlord assets. The determination of whether an improvement is a landlord asset requires judgment. In making this judgment, our primary consideration is whether the improvement would be utilizable by another tenant upon move out of the improved space by the then-existing tenant. If the Company has funded an improvement that it determines not to be landlord assets, then it treats the costs of the improvement as lease incentives. If the tenant has funded the improvement that the Company determines to be landlord assets, then the Company treats the costs of the improvement as deferred revenue and amortize this cost into revenue over the lease term.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance expenses, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred.

Tenant reimbursements are recognized and presented in accordance with accounting guidance which requires that these reimbursements be recorded on a gross basis because the Company is generally the primary obligor with respect to the goods and services the purchase of which gives rise to the reimbursement obligation; because the Company has discretion in selecting the vendors and suppliers; and because the Company bears the credit risk in the event they do not reimburse the Company. The Company also receives payments from third parties for reimbursement of a portion of the payroll and payroll-related costs for certain of the Company's personnel allocated to perform services for these third parties and reflects these payments on a gross basis.

The Company recognizes gains on sales of real estate at times and in amounts determined in accordance with the accounting guidance for sales of real estate. The guidance takes into account the terms of the transaction and any continuing involvement, including in the form of management, leasing of space or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, then the Company defers some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery method, as appropriate, until the sales criteria are met

The Company derives parking revenues from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company receives management and development fees from third parties.

Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company records development fees as earned taking into account the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

No tenant represented greater than 10% of the Company’s rental revenue in 2013, 2012 or 2011.

Income Taxes

Parent Company

The Parent Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). In order to continue to qualify as a REIT, the Parent Company is required to, among other things, distribute at least 90% of its annual REIT taxable income to its shareholders and meet certain tests regarding the nature of its income and assets. As a REIT, the Parent Company is not subject to federal and state income taxes with respect to the portion of its income that meets certain criteria and is distributed annually to its shareholders. Accordingly, no provision for federal and state income taxes is included in the accompanying consolidated financial statements with respect to the operations of the Parent Company. The Parent Company intends to continue to operate in a manner that allows it to meet the requirements for taxation as a REIT. If the Parent Company fails to qualify as a REIT in any taxable year, it will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent tax years. The Parent Company is subject to certain local income

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taxes. Provision for such taxes has been included in general and administrative expenses in the Parent Company’s Consolidated Statements of Operations and Comprehensive Income.

The tax basis of the Parent Company’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Parent Company is subject to a 4% federal excise tax if sufficient taxable income is not distributed within prescribed time limits. The excise tax equals 4% of the annual amount, if any, by which the sum of (a) 85% of the Parent Company’s ordinary income and (b) 95% of the Parent Company’s net capital gain exceeds cash distributions and certain taxes paid by the Parent Company. No excise tax was incurred in 2013, 2012, or 2011.

The Parent Company has elected to treat several of its subsidiaries as taxable REIT subsidiaries (each a “TRS”). A TRS is subject to federal, state and local income tax. In general, a TRS may perform non-customary services for tenants, hold assets that the Parent Company, as a REIT, cannot hold directly and generally may engage in any real estate or non-real estate related business. The Company’s taxable REIT subsidiaries did not have any tax provisions or deferred income tax items as of December 31, 2013 and 2012.

Operating Partnership

In general, the Operating Partnership is not subject to federal and state income taxes, and accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements. The partners of the Operating Partnership are required to include their respective share of the Operating Partnership’s profits or losses in their respective tax returns. The Operating Partnership’s tax returns and the amount of allocable Partnership profits and losses are subject to examination by federal and state taxing authorities. If such examination results in changes to the Operating Partnership profits or losses, then the tax liability of the partners would be changed accordingly.

The tax basis of the Operating Partnership’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Operating Partnership may elect to treat one or more of its subsidiaries as REITs under Sections 856 through 860 of the Code. Each subsidiary REIT has met the requirements for treatment as a REIT under Sections 856 through 860 of the Code, and, accordingly, no provision has been made for federal and state income taxes in the accompanying consolidated financial statements. If any subsidiary REIT fails to qualify as a REIT in any taxable year, that subsidiary REIT will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent taxable years. Also, each subsidiary REIT may be subject to certain local income taxes.

The Operating Partnership has elected to treat several of its subsidiaries as TRSs, which are subject to federal, state and local income tax.

Earnings Per Share

Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings, if any, of certain securities, by the weighted average number of shares of common stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options, and conversion of the noncontrolling interests in the Operating Partnership.

Earnings Per Unit

Basic EPS is computed by dividing net income available to common unitholders, as adjusted for unallocated earnings, if any, of certain securities issued by the Operating Partnership, by the weighted average number of common unit equivalents outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options.

Stock-Based Compensation Plans

The Parent Company maintains a shareholder-approved equity-incentive plan known as the Amended and Restated 1997 Long-Term Incentive Plan (the “1997 Plan”). The 1997 Plan is administered by the Compensation Committee of the Parent Company’s Board of Trustees. Under the 1997 Plan, the Compensation Committee is authorized to award equity and equity-based awards, including incentive stock options, non-qualified stock options, restricted shares and performance-based shares. On June 2, 2010, the Parent Company’s shareholders approved amendments to the 1997 Plan that, among other things, increased the number of common shares available for future awards under the 1997 Plan by 6,000,000 (of which 3,600,000 shares are available solely for options and share appreciation rights). As of December 31, 2013, 5,195,177 common shares remained available for future awards

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under the 1997 Plan (including 2,983,569 shares available solely for options and share appreciation rights). Through December 31, 2013 all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $8.3 million during 2013, of which $1.4 million was capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company incurred stock-based compensation expense of $8.6 million and $6.4 million during 2012 and 2011, of which $2.6 million and $1.5 million, respectively, were also capitalized. The expensed amounts are included in general and administrative expense on the Company’s consolidated income statement in the respective periods.

Comprehensive Income

Comprehensive income or loss is recorded in accordance with the provisions of the accounting standard for comprehensive income. The accounting standard establishes standards for reporting comprehensive income and its components in the financial statements. Comprehensive income includes the effective portions of changes in the fair value of derivatives.

Accounting for Derivative Instruments and Hedging Activities

The Company accounts for its derivative instruments and hedging activities in accordance with the accounting standard for derivative and hedging activities. The accounting standard requires the Company to measure every derivative instrument (including certain derivative instruments embedded in other contracts) at fair value and record them in the balance sheet as either an asset or liability. See disclosures below related to the accounting standard for fair value measurements and disclosures.

For derivatives designated as cash flow hedges, the effective portions of changes in the fair value of the derivative are reported in other comprehensive income while the ineffective portions are recognized in earnings.

The Company actively manages its ratio of fixed-to-floating rate debt. To manage its fixed and floating rate debt in a cost-effective manner, the Company, from time to time, enters into interest rate swap agreements as cash flow hedges, under which it agrees to exchange various combinations of fixed and/or variable interest rates based on agreed upon notional amounts.

Fair Value Measurements

The Company estimates the fair value of its derivatives in accordance with the accounting standard for fair value measurements and disclosures. The accounting standard defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. It also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value. Financial assets and liabilities recorded on the Consolidated Balance Sheets are categorized based on the inputs to the valuation techniques as follows:

• Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access;

• Level 2 inputs are inputs other than quoted prices included in Level 1, that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals; and

• Level 3 inputs are unobservable inputs for the asset or liability, which is typically based on an entity’s own assumptions, as there is little, if any, related market activity or information.

In instances where 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 input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.

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The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2013 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2013		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Interest Rate Swaps	$	767	$	—	$	767	$	—
Liabilities:
Interest Rate Swaps	$	2,188	$	—	$	2,188	$	—

The following table sets forth the Company’s financial liabilities that were accounted for at fair value on a recurring basis as of December 31, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	14,210	$	—	$	14,210	$	—

We classify our interest rate swaps, shown above, within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments.

Non-financial assets and liabilities recorded at fair value on a non-recurring basis to which the Company would apply the accounting standard where a measurement was required under fair value would include:

• Non-financial assets and liabilities initially measured at fair value in an acquisition or business combination that are not remeasured at least quarterly at fair value,

• Long-lived assets measured at fair value due to an impairment in accordance with the accounting standard for the impairment or disposal of long-lived assets,

• Equity and cost method investments measured at fair value due to an impairment in accordance with the accounting standard for investments,

• Notes receivable adjusted for any impairment in its value in accordance with the accounting standard for loan receivables, and

• Asset retirement obligations initially measured at fair value under the accounting standard for asset retirement obligations.

Other than the remeasurements of our equity method investments of Six Tower Bridge, One Commerce Square and Two Commerce Square (see Note 3), the formation of the Austin Venture (see Note 4) and the 2013 business combinations (see Note 3), there were no items that were accounted for at fair value on a non-recurring basis for the twelve months ended December 31, 2013.

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3. REAL ESTATE INVESTMENTS

As of December 31, 2013 and 2012 the gross carrying value of the Company’s Properties was as follows (in thousands):

	2013		2012
Land	$	680,513	$	662,107
Building and improvements	3,504,060		3,576,065
Tenant improvements	484,716		487,997
	$	4,669,289	$	4,726,169

Acquisitions and Dispositions

2013

Acquisitions

One and Two Commerce Square

On December 19, 2013, the Company acquired 99% of the common interests in the One and Two Common Square partnerships ("Commerce Square"), the entities which own two 41-story Trophy-class office towers in Philadelphia, Pennsylvania, from Parkway Properties, Inc. The office towers contain 1,896,142 of net rentable square feet and were 86.7% occupied as of December 31, 2013.  The Company acquired Commerce Square for an aggregate purchase price of $331.8 million and funded the acquisition via assumption of $237.1 million of existing mortgage debt and a $73.1 million cash payment from available corporate funds.

The Company previously accounted for our non-controlling interest in Commerce Square under the equity method of accounting. As a result of acquiring a 99% common interest in the partnerships we obtained control of Commerce Square and our existing investment balance was remeasured based on the fair value of the underlying properties acquired and the existing distribution provisions under the relevant partnership agreements. Accordingly, a loss on remeasurement of $1.0 million was recorded as a result of this transaction.

The Company has treated this transaction as a business combination and allocated the purchase price to the tangible and intangible assets and liabilities. As discussed in Note 2, the Company utilized a number of sources in making estimates of fair values for purposes of allocating the purchase price to tangible and intangibles assets acquired and intangible liabilities assumed. The purchase price is allocated as follows:

	December 19, 2013
Building, land and improvements	$	255,705
Intangible assets acquired	85,036
Below market lease liabilities assumed	(8,637		)
	$	332,104
Mortgage debt assumed - at fair value (1)	(238,082		)
Return of existing equity method investment	(30,424		)
Net working capital assumed	10,423
Non-controlling interest	(946		)
Total cash payment at settlement	$	73,075

(1) Principal outstanding on assumed mortgage debt at December 19, 2013 was $237.1 million.

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Intangible assets acquired and intangible liabilities assumed consist of the following (in thousands):

	December 19, 2013			Weighted Average Amortization Period (in years)
Intangible assets:
In-place lease value	$	80,916		7.9
Above market tenant leases acquired	4,120			6.9
Total	$	85,036
Intangible liabilities:
Below market leases acquired	$	(8,637	)	6.5

The Commerce Square redemption agreement allows for a 60 day settlement period related to the net working capital assets related to the acquired partnership interests. As of December 31, 2013, the Company has a $2.1 million receivable balance from its former partner which is due under the terms of the redemption agreement.

In connection with the acquisition of One Commerce Square, we assumed a $125.1 million existing non-recourse first mortgage with a fixed interest rate of 5.67% and a maturity date of January 6, 2016. In accordance with generally accepted accounting principles, the mortgage was recorded at $130.2 million to reflect the fair value.

In connection with the acquisition of Two Commerce Square, we assumed a $112.0 million existing non-recourse first mortgage with a fixed interest rate of 3.96% and a maturity date of April 5, 2023. In accordance with generally accepted accounting principles, the mortgage was recorded at $107.9 million to reflect the fair value.

The Company recognized $0.9 million of acquisition related costs which are included as part of general and administrative expenses of the Company’s consolidated statement of operations.

Four Points Centre

On December 19, 2013, the Company acquired two 3-story, Class A office buildings totaling 192,396 of net rentable square feet known as Four Points Centre, together with 22.3 acres of nearby parcels of land in Austin, Texas known for an aggregate $47.3 million. This property was 99.2% occupied as of December 31, 2013. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition has been treated as a business combination and the total purchase price was allocated as follows: $36.0 million to building, $5.8 million to land, $6.5 million to intangible assets and $1.0 million to below market lease liabilities assumed.

Six Tower Bridge

On June 19, 2013, the Company acquired the remaining ownership interest in the real estate venture known as "Six Tower Bridge" that it did not then already own. See Note 4 "Investments in Unconsolidated Real Estate Ventures" for further discussion.

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The unaudited pro forma information below summarizes the Company’s combined results of operations for the years ended December 31, 2013 and 2012 as though the acquisition of One and Two Commerce Square, Four Points Centre and Six Tower Bridge were completed on January 1, 2012. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor do they purport to represent the Company’s results of operations for future periods (in thousands except for per share amounts).

	December 31,
	2013		2012
Pro forma revenue	$	610,979	$	592,753
Pro forma income (loss) from continuing operations	21,805		(60,011		)
Pro forma net income (loss) available to common shareholders	25,957		(16,970		)
Earnings per common share from continuing operations:
Basic -- as reported	$	0.20	$	(0.36	)
Basic -- as pro forma	$	0.14	$	(0.42	)
Diluted -- as reported	$	0.20	$	(0.36	)
Diluted -- as pro forma	$	0.14	$	(0.42	)
Earnings per common share:
Basic -- as reported	$	0.23	$	(0.06	)
Basic -- as pro forma	$	0.17	$	(0.12	)
Diluted -- as reported	$	0.23	$	(0.06	)
Diluted -- as pro forma	$	0.17	$	(0.12	)

Included in the consolidated statements of income for the year ended December 31, 2013 are total revenues of $3.4 million and a net loss attributable to common shareholders of $0.2 million from acquisitions made during 2013.

Cira Centre

On November 19, 2013, the Company acquired a 0.8 acre land parcel underlying Cira Centre in Philadelphia, Pennsylvania for $24.6 million. The purchase terminates a long term ground lease agreement entered into during the development of Cira Centre. The Company has accounted for the transaction as an asset acquisition. Prior to the acquisition date, the Company recorded ground rent expense on a straight-line basis, resulting in accrued rent liability of $12.1 million. The accounting guidance for leases requires that an asset purchased which was previously subject to an operating lease cannot result in a gain, accordingly, the basis of the acquired land was reduced by the accrued rent liability and no income was recognized at acquisition. The Company funded the cost of the acquisition with available corporate funds and capitalized $1.4 million of acquisition related costs as part of the basis in the operating land.

Three Logan Square

On April 25, 2013, the Company exercised its purchase option under the long term ground lease agreement it held through its acquisition of Three Logan Square on August 5, 2010 and acquired the 1.8 acre land parcel underlying Three Logan Square in Philadelphia, Pennsylvania for $20.8 million. The Company has accounted for the transaction as an asset acquisition. A portion of the original purchase price of Three Logan Square was allocated to a below market ground lease intangible asset. As the sum of the purchase price of the land plus the $4.3 million remaining unamortized balance for the intangible asset approximates the fair value of the land as unencumbered by the ground lease, the remaining intangible asset balance was reclassified to land upon exercise of the purchase option. The Company funded the cost of the acquisition with available corporate funds and capitalized $0.1 million of acquisition related costs as part of the basis in the operating land.

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Dispositions

On December 19, 2013, we sold a 50,000 net rentable square feet office property located in King of Prussia, Pennsylvania known as 875 First Avenue, for a sales price of $3.8 million resulting in a $0.1 million gain on sale after closing and other transaction related costs.

On October 17, 2013, we sold a 39,330 net rentable square feet office property located in West Chester, Pennsylvania known as 1336 Enterprise Drive, for a sales price of $2.6 million resulting in a $0.2 million gain on sale after closing and other transaction related costs.

On October 16, 2013 the Austin portfolio was contributed to a newly formed real estate venture. For additional information, see Note 4 to our consolidated financial statements.

On August 5, 2013, the Company sold an eight-acre parcel of land located in Richmond, Virginia known as Dabney Land East, for a sales price of $0.5 million resulting in a $0.1 million loss on sale after closing and other transaction related costs. The land parcel was undeveloped as of the date of sale.

On June 28, 2013, the Company sold 16870 West Bernardo Drive, a 68,708 net rentable square feet office property located in San Diego, California, for a sales price of $18.0 million resulting in a $0.9 million loss on sale after closing and other transaction related costs.

On June 28, 2013, the Company sold 100 Arrandale Boulevard, a 34,931 net rentable square feet office property located in Exton, Pennsylvania, for a sales price of $3.5 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 19, 2013, the Company sold 1700 Paoli Pike, a 28,000 net rentable square feet office property located in Malvern, Pennsylvania known as 100 Applebrook, for a sales price of $2.7 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 14, 2013, the Company sold Pacific View Plaza, a 51,695 net rentable square feet office property located in Carlsbad, California, for a sales price of $10.3 million resulting in a $0.5 million loss on sale after closing and other transaction related costs.

On February 25, 2013, the Company sold a portfolio of eight office properties containing 800,546 square feet in Lawrenceville, New Jersey, known as "Princeton Pike Corporate Center," for an aggregate sales price of $121.0 million resulting in a $5.3 million gain on sale after closing and other transaction related costs.

The sales of these properties, with the exception of the Austin portfolio and Dabney Land East, are included in discontinued operations (see Note 10).

2012

Brandywine/Toll Brothers Venture Formation

On September 5, 2012, the Company formed a joint venture, TB-BDN Plymouth Apartments, L.P., (the "Venture"), with Toll Brothers, Inc. ("Toll Brothers"), a residential home builder. The Company and Toll Brothers each own a 50% interest in the Venture. The Venture owns a 20-acre parcel of land located in Plymouth Meeting, Pennsylvania, which the Company contributed to the Venture upon its formation. Concurrent with the Company's contribution of the aforementioned land parcel, Toll Brothers contributed $15.5 million of cash to the venture, equivalent to the fair value of the land parcel contributed by the Company. The Venture will use the cash contributed by Toll Brothers to fund predevelopment costs for construction of a 398 unit apartment complex.

Based on the facts and circumstances at the date of formation of the Venture, and in accordance with applicable accounting standards for the consolidation of variable interest entities, or VIEs, the Company determined that the Venture is not a VIE. Accordingly, the Company used the voting interest model under the accounting standards for consolidation to determine whether to consolidate the Venture. Under the joint venture agreement for the Venture, each of the Company and Toll Brothers has significant participating rights and the Company does not have exclusive control over the development or construction phases of the Venture's project. Because each partner has significant participating rights, the Company deconsolidated the land parcel that was contributed to the Venture, and the Company is accounting for the Venture under the equity method of accounting. As of December 31, 2012, the carrying amount of the Company's equity investment in the Venture equaled $15.2 million, with an associated $0.3 million permanent basis adjustment accounting for the difference between the fair value and carrying amount of the land parcel contributed

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by the Company. This basis adjustment will remain unamortized until the property is sold to a third party or until the Venture is dissolved, in accordance with the accounting standard for equity method investment.

Brandywine AI Venture - Station Square Acquisition

On July 10, 2012, the Company contributed $26.1 million to a joint venture, Brandywine AI Venture, that the Company formed in 2011 with an affiliate of Allstate Insurance. The Company's contribution funded its share of partner capital for the Venture's $120.6 million acquisition of three office properties containing 497,896 net rentable square feet in Silver Spring, Maryland.

Acquisitions

On December 31, 2012, the Company acquired a two-building office property totaling 136,075 of net rentable square feet in Austin, Texas known as 7000 West at Lantana for $32.1 million. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition was treated as a business combination and the total purchase price was allocated as follows: $20.9 million to building, $4.7 million to land, $8.4 million to intangible assets and $1.9 million to below market lease liabilities assumed.

On December 11, 2012, the Company acquired an office property containing 456,922 net rentable square feet in Philadelphia, Pennsylvania known as 1900 Market Street for $34.8 million. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition was treated as a business combination and the total purchase price was allocated as follows: $17.3 million to building, $7.8 million to land, $13.5 million to intangible assets and $3.8 million to below market lease liabilities assumed.

On November 20, 2012, the Company acquired a ten-acre parcel of land in Herndon, Virginia for $2.1 million. The Company funded the acquisition price with available corporate funds. The Company accounted for this transaction as an asset acquisition and capitalized a nominal amount of acquisition related and other costs as part of land inventory on its consolidated balance sheet.

On January 6, 2012, the Company acquired a vacant office property containing 154,392 net rentable square feet in Plymouth Meeting, Pennsylvania known as 660 West Germantown Pike for $9.1 million. The Company is currently redeveloping this property. The Company funded the acquisition price with available corporate funds. The Company recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet.

Dispositions

On July 18, 2012, the Company sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, collectively known as "Oaklands Corporate Center," for a sales price of $52.7 million resulting in a $9.9 million gain on sale after closing and other transaction related costs.

On June 22, 2012, the Company sold Pacific Ridge Corporate Center, a 121,381 net rentable square feet, two-building office property located in Carlsbad, California, for a sales price of $29.0 million resulting in a $2.8 million loss on sale after closing and other transaction related costs.

On March 22, 2012, the Company sold South Lake at Dulles Corner, a 268,240 net rentable square feet office property located in Herndon, Virginia, for a sales price of $91.1 million resulting in a $14.5 million gain on sale after closing and other transaction related costs.

On January 17, 2012, the Company sold 304 Harper Drive, a 32,978 net rentable square feet office property located in Moorestown, New Jersey, for a sales price of $3.0 million resulting in a $0.2 million gain on sale after closing and other transaction related costs.

Each of these sales is included in discontinued operations (see Note 10).

4. INVESTMENT IN UNCONSOLIDATED VENTURES

As of December 31, 2013, the Company had an aggregate investment of approximately $180.5 million in 17 unconsolidated Real Estate Ventures. The Company formed or acquired interests in these ventures with unaffiliated third parties to develop or manage office properties or to acquire land in anticipation of possible development of office or residential properties. As of December 31, 2013, 11 of the real estate ventures owned 55 office buildings that contain an aggregate of approximately 5.7 million net rentable square feet; two real estate ventures owned 3.8 acres of undeveloped parcels of land; three real estate ventures owned 22.5 acres of land under active development and one real estate venture developed a hotel property that contains 137 rooms in Conshohocken, PA.

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The Company accounts for its unconsolidated interests in its Real Estate Ventures using the equity method. The Company’s unconsolidated interests range from 20% to 65%, subject to specified priority allocations of distributable cash in certain of the Real Estate Ventures.

The amounts reflected in the following tables (except for the Company’s share of equity and income) are based on the historical financial information of the individual Real Estate Ventures. The Company does not record operating losses of the Real Estate Ventures in excess of its investment balance unless the Company is liable for the obligations of the Real Estate Venture or is otherwise committed to provide financial support to the Real Estate Venture.

The Company’s investment in Real Estate Ventures as of December 31, 2013 and the Company’s share of the Real Estate Ventures’ income (loss) for the year ended December 31, 2013 was as follows (in thousands):

	Ownership Percentage (a)		Carrying Amount			Company’s Share of 2013 Real Estate Venture Income (Loss)			Real Estate Venture Debt at 100%		Current Interest Rate		Debt Maturity
Broadmoor Austin Associates (f)	50	%	$	65,867		$	(52	)	$	56,616	7.04	%	Apr-23
Brandywine-AI Venture LLC	50	%	46,406			130			134,500		3.92	%	(b)
DRA (G&I) Austin (f)	50	%	17,262			(434		)	230,600		3.39	%	(c)
HSRE-Campus Crest IX, LLC (f)	30	%	13,761			—			966		L+2.20%		Jul-16
4040 Wilson LLC	50	%	13,499			—			—		N/A		N/A
TB-BDN Plymouth Apartments	50	%	12,402			5			—		L+1.70%		Dec-17
Brandywine 1919 Ventures	50	%	6,214			—			—		N/A		N/A
1000 Chesterbrook Blvd.	50	%	2,064			461			24,861		4.75	%	Dec-21
Four Tower Bridge	65	%	1,617			320			10,535		5.20	%	Feb-21
PJP VII	25	%	783			239			6,250		L+2.65%		Dec-19
Residence Inn Tower Bridge	50	%	742			326			13,700		5.63	%	Feb-16
Seven Tower Bridge	20	%	447			—			11,035		4.22	%	(d)
PJP II	30	%	330			(87		)	3,765		6.12	%	Nov-23
PJP V	25	%	175			158			5,437		6.47	%	Aug-19
PJP VI	25	%	112			70			8,404		6.08	%	Apr-23
BDN Beacon Venture LLC (i)	20	%	—			907			—		N/A		N/A
Six Tower Bridge (g)	63	%	—			165			—		N/A		N/A
One Commerce Square (h)	25	%	—			933			—		N/A		N/A
Two Commerce Square (h)	25	%	—			614			—		N/A		N/A
G&I Interchange Office LLC (DRA — N. PA) (e) (f)	20	%	—			(619		)	177,207		5.78	%	Jan-15
Two Tower Bridge (i)	35	%	—			265			—		N/A		N/A
Coppell Associates	50	%	(1,169		)	(78		)	15,984		5.75	%	Feb-16
Eight Tower Bridge (i)			—			3			—
Invesco, L.P. (i)			—			338			—
			$	180,512		$	3,664		$	699,860

(a) Ownership percentage represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

(b) The debt for these properties is comprised of three fixed rate mortgages: (1) $40.0 million with a 4.40% fixed interest rate due January 1, 2019, (2) $28.0 million with a 4.65% fixed interest rate due January 1, 2022, and (3) $66.5 million with a 3.22% fixed interest rate due August 1, 2019, resulting in a time and dollar weighted average rate of 3.92%.

(c) The debt for these properties is comprised of three mortgages: (1) $34.0 million with a 3.52% interest rate due November 1, 2018, (2) $56.0 million with a 3.19% interest rate due October 15, 2018, and (3) $140.6 million with a rate of 3.44% fixed interest rate due November 1, 2018, resulting in a time and dollar weighted average rate of 3.39%.

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(d) Comprised of two fixed rate mortgages totaling $8.0 million that mature on February 8, 2015 and accrue interest at a current rate of 6% (increasing by 1% annually through maturity), a $1.0 million3% fixed rate loan with interest only through its September 1, 2025 maturity, and a $2.0 million4% fixed rate loan with interest only through its February 7, 2016 maturity, resulting in a time and dollar weighted average rate of 4.22%.

(e) Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. No investment in the real estate venture was reflected on the balance sheet at formation.

(f) The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).

(g) On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.

(h) On December 19, 2013, we increased our ownership interest in One and Two Commerce Square. The real estate venture income reflects our previous partnership interest for the year to date period through December 18, 2013.

(i) The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.

The following is a summary of the financial position of the Real Estate Ventures as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013		December 31, 2012
Net property	$	965,475	$	923,536
Other assets	164,152		174,677
Other liabilities	49,442		53,645
Debt	699,860		724,780
Equity	380,325		319,788
Company’s share of equity (Company’s basis)	180,512		193,555

The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests as of December 31, 2013, 2012 and 2011 (in thousands):

	Years ended December 31,
	2013		2012		2011
Revenue	$	102,919	$	164,013	$	145,867
Operating expenses	40,436		70,775		63,715
Interest expense, net	26,529		41,633		42,032
Depreciation and amortization	35,138		50,241		39,172
Net income	816		1,364		948
Company’s share of income (Company’s basis)	3,664		2,741		3,775

As of December 31, 2013, the aggregate principal payments of recourse and non-recourse debt payable to third-parties are as follows (in thousands):

2014	$	11,940
2015	191,304
2016	42,180
2017	13,937
2018	229,780
Thereafter	210,719
	$	699,860

Austin Venture

On October 16, 2013, the Company contributed a portfolio of seven office properties containing an aggregate of 1,398,826 square feet located in Austin, Texas (the "Austin Properties") to a newly-formed joint venture (the "Austin Venture") with G&I VII Austin

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Office LLC (“DRA”). The Austin Properties and related assets represent the Company's entire remaining property portfolio within the Austin, Texas region, with the exception of the acquisition of Four Points Centre disclosed in Note 3. DRA and the Company, based on arm's-length negotiation, agreed to an aggregate gross sales price of $330.0 million subject to an obligation on the Company's part to fund the first $5.2 million of post-closing capital expenditures, of which $0.8 million had been funded by us through December 31, 2013.

DRA owns a 50% interest in the Austin Venture and the Company owns a 50% interest in the Austin Venture, subject to the Company's right to receive up to an additional 10% of distributions.

At the closing the Austin Venture obtained third party debt financing of approximately $230.6 million secured by mortgages on the Austin Properties and used proceeds of this financing together with $49.7 million of cash contributions by DRA (less $1.9 million of closing costs and $6.9 million of closing prorations and lender holdbacks) to fund a $271.5 million distribution to the Company. The Company has agreed to fund the first $5.2 million of post-closing capital expenditures on behalf of the Austin Venture, resulting in net proceeds of $266.3 million after funding the Company's capital expenditure obligation. As part of the transaction, the Company's subsidiary management company executed an agreement with the Austin Venture to provide property management and leasing services to the Austin Venture in exchange for a market-based fee.

The Company and DRA, utilizing additional equity funding of up to $100.0 million per partner and to-be-determined third-party debt financing, intend to jointly pursue additional office opportunities in targeted Austin sub-markets and plan to co-invest in acquisitions that meet certain investment criteria.

Based upon the facts and circumstances at formation of the Austin Venture, the Company determined that the Austin Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the voting interest model under the accounting standard for consolidation in order to determine whether to consolidate the Austin Venture. Based upon each member's substantive participating rights over the activities of the Austin Venture under the operating and related agreements of the Austin Venture, it is not consolidated by the Company, and is accounted for under the equity method of accounting. As a result, the Company measured its equity interest at fair value based on the fair value of the Austin Properties and the distribution provisions of the real estate venture agreement. Since the Company retains a non-controlling interest in the Austin Properties and there are no other facts and circumstances that preclude the consummation of a sale, the contribution qualifies as a partial sale of real estate under the relevant guidance for sales of real estate. Accordingly, during the fourth quarter of 2013, the Company recorded a gain of approximately $25.9 million, which is reflected in "Net gain (loss) on real estate venture transactions" on the accompanying statement of operations.

The Company's continuing involvement with the properties through its interest in the Venture and its management and leasing activities represents a significant continuing involvement in the properties. Accordingly, under the accounting standard for reporting discontinued operations, the Company has determined that the gain on partial sale and the operations of the properties should not be included as part of discontinued operations in its consolidated statements of operations.

4040 Wilson Venture

On July 31, 2013, the Company formed 4040 Wilson LLC Venture ("4040 Wilson"), a joint venture between the Company and Ashton Park Associates LLC (“Ashton Park”), an unaffiliated third party. Each of the Company and Ashton Park owns a 50% interest in 4040 Wilson. 4040 Wilson expects to construct a 426,900 square foot office representing the final phase of the eight building, mixed-use, Liberty Center complex developed by the parent company of Ashton Park in the Ballston submarket of Arlington, Virginia. 4040 Wilson expects to develop the office building on a 1.3-acre land parcel contributed by Ashton Park to 4040 Wilson at an agreed upon value of $36.0 million. The total estimated project costs are $194.1 million, which the Company expects will be financed through approximately $72.0 million of partner capital contributions (consisting of land with a value of $36.0 million from Ashton Park and $36.0 million in cash from the Company, of which $13.5 million has been funded to date) and approximately $125.1 million of debt financing through a construction lender that has not yet been determined. As part of the 4040 Wilson venture, the Company has agreed to guarantee 100% of any lender mandated recourse. As of December 31, 2013, the Company had not provided any guarantees in respect of 4040 Wilson.

Based upon the facts and circumstances at formation of 4040 Wilson, the Company determined that 4040 Wilson is a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate 4040 Wilson. Based upon each member's shared power over the activities of 4040 Wilson under the operating and related agreements of 4040 Wilson, and the Company's lack of control over the development and construction phases of the project, 4040 Wilson is not consolidated by the Company, and is accounted for under the equity method of accounting.

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Two and Six Tower Bridge Exchange Transaction

On June 19, 2013, the Company acquired, from an unaffiliated third party, the third party's ownership interest in the Six Tower Bridge real estate venture through a nonmonetary exchange for the Company's ownership interest in the Two Tower Bridge real estate venture. The Six Tower Bridge real estate venture owns an unencumbered office property in Conshohocken, PA. The Company previously accounted for its noncontrolling interest in Six Tower Bridge using the equity method. As a result of the exchange transaction, the Company obtained control of the Six Tower Bridge property and the Company's existing equity interest was remeasured at fair value based on the fair value of the underlying property and the distribution provisions of the real estate venture agreement. Accordingly, during 2013, the Company recorded a gain of approximately $7.8 million, which is reflected in "Net gain from remeasurement of investments in a real estate ventures" on the accompanying statement of operations. Following the acquisition, the Class A office property in Conshohocken, PA is wholly owned by the Company with an unencumbered fair value of $24.5 million. The Company accounted for this transaction as a business combination and allocated the fair value as follows: $14.8 million to building, $6.9 million to land, $3.3 million to intangible assets and $0.5 million to below market lease liabilities assumed.

As mentioned above, the Company exchanged its non-controlling interest in Two Tower Bridge real estate venture in a nonmonetary transaction with an unaffiliated third party for the third party's interest in the Six Tower Bridge real estate venture. The investment in Two Tower Bridge had a fair value of $3.6 million on the date of the exchange transaction based on the fair value of the venture's equity and the distribution provisions of the real estate venture agreement. Based on this fair value and the carrying value for the Company's investment of $(0.1) million, during 2013 the Company recognized a gain on exchange ofinterests in real estate venturesof $3.7 million, which is reflected in "Net gain (loss) on real estate venture transactions" on the accompanying statement of operations.

evo at Cira Centre South Venture (formerly the Grove Venture)

On January 25, 2013, the Company formed HSRE-Campus Crest IX Real Estate Venture ("evo at Cira"), a joint venture among the Company and two unaffiliated third parties: Campus Crest Properties, LLC ("Campus Crest") and HSRE-Campus Crest IXA, LLC ("HSRE"). evo at Cira has commenced construction of a 33-story, 850-bed student housing tower located in the University City submarket of Philadelphia, Pennsylvania. Each of the Company and Campus Crest owns a 30% interest in evo at Cira and HSRE owns a 40% interest. evo at Cira is developing the project on a one-acre land parcel held under a long-term ground lease with a third party lessor. The Company contributed to evo at Cira its tenancy rights under a long-term ground lease, together with associated development rights, at an agreed-upon value of $8.5 million. The total estimated project costs are $158.5 million, which will be financed through partner capital contributions totaling $60.7 million, with the remaining $97.8 million being financed through construction facilities provided by PNC Bank, Capital One and First Niagara Bank. As of December 31, 2013, we have funded 100% of our share of the equity contributions. Construction has already commenced, with a targeted project completion in 2014.

In connection with the development of evo at Cira, each of the Company and Campus Crest provided, in addition to customary non-recourse carve-out guarantees, a completion and cost overrun guaranty, as well as a payment guaranty, on the construction financing (with the Company's share of the payment guaranty being approximately $24.7 million).

The Company's historical cost basis in the development rights that it contributed to the evo at Cira was $4.0 million, thus creating a $4.5 million basis difference at December 31, 2013 between the Company's initial outside investment basis and its $8.5 million initial equity basis. As this basis difference is not related to a physical land parcel, but rather to development rights to construct evo at Cira, the Company will accrete the basis difference as a reduction of depreciation expense over the life of evo at Cira's assets.

Based upon the facts and circumstances at evo at Cira formation, the Company determined that evo at Cira is a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate the evo at Cira. Based upon each member's shared power over the activities of evo at Cira under the operating and related agreements of evo at Cira, and the Company's lack of exclusive control over the development and construction phases of the project, evo at Cira is not consolidated by the Company, and is accounted for under the equity method of accounting. Accordingly, the land parcel and associated development rights contributed by the Company to evo at Cira were deconsolidated by the Company upon formation of evo at Cira.

BDN Beacon Venture

On March 26, 2013, the Company sold its entire 20% ownership interest in an unconsolidated real estate venture known as BDN Beacon Venture LLC (the "Beacon Venture"). The carrying amount of the Company's investment in the Beacon Venture amounted to $17.0 million at the sale date, with the Company's proceeds effectively matching the carrying amount.

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Guarantees

As of December 31, 2013, the Company has provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures the Company provided and expects to continue to provide cost overrun and completion guarantees, with rights of contribution among partners in the venture, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements.

5. DEFERRED COSTS

As of December 31, 2013 and 2012, the Company’s deferred costs were comprised of the following (in thousands):

	December 31, 2013
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	155,885	$	(58,805	)	$	97,080
Financing Costs	40,317		(14,443		)	25,874
Total	$	196,202	$	(73,248	)	$	122,954

	December 31, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	150,331	$	(58,343	)	$	91,988
Financing Costs	40,246		(9,991		)	30,255
Total	$	190,577	$	(68,334	)	$	122,243

During the years ended December 31, 2013, 2012 and 2011, the Company capitalized internal direct leasing costs of $7.5 million, $7.5 million, and $6.6 million, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

6. INTANGIBLE ASSETS

As of December 31, 2013 and 2012, the Company’s intangible assets were comprised of the following (in thousands):

	December 31, 2013
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	150,782	$	(35,607	)	$	115,175
Tenant relationship value	38,692		(26,868		)	11,824
Above market leases acquired	6,673		(1,343		)	5,330
Total	$	196,147	$	(63,818	)	$	132,329
Below market leases acquired	$	81,991	$	(47,547	)	$	34,444

	December 31, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	87,909	$	(42,894	)	$	45,015
Tenant relationship value	56,137		(37,389		)	18,748
Above market leases acquired	8,565		(1,708		)	6,857
Total	$	152,611	$	(81,991	)	$	70,620
Below market leases acquired	$	77,083	$	(43,224	)	$	33,859

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For the years ended December 31, 2013, 2012, and 2011, the Company wrote-off through the acceleration of amortization approximately $1.6 million, $1.4 million and $7.4 million, respectively, of intangible assets as a result of tenant move-outs prior to the end of the associated lease term. For the years ended December 31, 2013 and December 31, 2012, the Company accelerated amortization of a nominal amount of intangible liabilities as a result of tenant move-outs. For the year ended December 31, 2011, the Company accelerated amortization of $0.2 million of intangible liabilities as a result of tenant move-outs.

As of December 31, 2013, the Company’s annual amortization for its intangible assets/liabilities was as follows (in thousands, and assuming no early lease terminations):

	Assets		Liabilities
2014	$	27,043	$	7,614
2015	23,314		5,455
2016	18,573		3,486
2017	16,573		2,890
2018	12,161		2,353
Thereafter	34,665		12,646
Total	$	132,329	$	34,444

7. DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at December 31, 2013 and 2012 (in thousands):

Property / Location	December 31, 2013			December 31, 2012			Effective Interest Rate			Maturity Date
MORTGAGE DEBT:
Tysons Corner	$	91,395		$	93,188		5.36	%		Aug-15
One Commerce Square	125,089			—			3.68	%	(a)	Jan-16
Two Logan Square	88,583			89,340			7.57	%		Apr-16
Fairview Eleven Tower	21,630			22,000			4.25	%	(b)	Jan-17
Two Commerce Square	112,000			—			4.51	%	(a)	Apr-23
IRS Philadelphia Campus	190,964			197,111			7.00	%		Sep-30
Cira South Garage	40,101			42,303			7.12	%		Sep-30
Principal balance outstanding	669,762			443,942
Plus: fair market value premiums (discounts), net	389			(968		)
Total mortgage indebtedness	$	670,151		$	442,974
UNSECURED DEBT:
Credit Facility	—			69,000			LIBOR + 1.50%			Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			150,000			2.60	%		Feb-15
Four-Year Term Loan	100,000			100,000			LIBOR + 1.75%			Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			200,000			3.62	%		Feb-19
$250.0M 5.400% Guaranteed Notes due 2014	218,549			238,379			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	157,625			166,535			7.76	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	149,919			150,429			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.68	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.13	%		Apr-18
$250.0M 3.950% Guaranteed Notes due 2023	250,000			250,000			4.02	%		Feb-23
Indenture IA (Preferred Trust I)	27,062			27,062			2.75	%		Mar-35
Indenture IB (Preferred Trust I)	25,774			25,774			3.30	%		Apr-35
Indenture II (Preferred Trust II)	25,774			25,774			3.09	%		Jul-35
Principal balance outstanding	1,929,703			2,027,953
plus: original issue premium (discount), net	(4,473		)	(5,597		)
Total unsecured indebtedness	$	1,925,230		$	2,022,356
Total Debt Obligations	$	2,595,381		$	2,465,330

(a) This loan was assumed upon acquisition of the related properties on December 19, 2013. The interest rate reflects the market rate at the time of acquisition.

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(b) Represents the full debt amount of a property in a consolidated joint venture for which the Company maintains a 50% interest.

During 2013, 2012, and 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 5.73%, 6.65%, and 6.72%, respectively. As of December 31, 2013 and 2012, the net carrying value of the Company's Properties that are encumbered by mortgage indebtedness was $669.8 million and $591.3 million, respectively.

During the year-ended December 31, 2013, the Company repurchased $29.3 million of its outstanding unsecured Notes in a series of transactions that are summarized in the following table (in thousands):

Notes	Principal		Repurchase Amount		Loss on Early Extinguishment of Debt			Acceleration of Deferred Financing Amortization
2014 5.400% Notes	$	19,830	$	20,822	$	(1,020	)	$	16
2015 7.500% Notes	8,910		9,902		(1,036		)	23
2016 6.000% Notes	510		572		(63		)	1
	$	29,250	$	31,296	$	(2,119	)	$	40

The Parent Company unconditionally guarantees the unsecured debt obligations of the Operating Partnership (or is a co-borrower with the Operating Partnership) but does not by itself incur unsecured indebtedness. The Parent Company has no material assets other than its investment in the Operating Partnership.

The Company utilizes its unsecured revolving credit facility (the "Credit Facility") for general business purposes, including funding costs of acquisitions, developments and redevelopments and repayment of other debt. The scheduled maturity date of the Credit Facility in place at December 31, 2013 is February 1, 2016. The per annum variable interest rate on the outstanding balances is LIBOR plus 1.50%. The interest rate and facility fee are subject to adjustment upon a change in the Company’s unsecured debt ratings. During each of the years ended December 31, 2013 and 2012, the weighted-average interest rates associated with the Credit Facility was 0.29% and 1.02%, respectively. As of December 31, 2013, the Company did not have any outstanding borrowings on its Credit Facility, with $1.3 million in letters of credit outstanding, leaving $598.7 million of unused availability under the Credit Facility.

The Company has the option to increase the amounts available to be advanced under the Credit Facility, the $150.0 million three-year term loan, and the $100.0 million four-year term loan by an aggregate of $200.0 million, subject to customary conditions and limitations, by obtaining additional commitments from the current lenders and other financial institutions. The Company also has the option to extend the maturity dates of each of the Credit Facility, the $150.0 million three-year term loan and the $100.0 million four-year term loan by one year, subject to payment of an extension fee and other customary conditions and limitations. The Company may repay the $150.0 million three-year term and the $100.0 million four-year term loans at any time without penalty. The $200.0 million seven-year term loan is subject to a prepayment penalty of 1.00% through February 1, 2015 with no penalty thereafter.

The spread to LIBOR for LIBOR-based loans under the Credit Facility and term loans depends on the Company's unsecured senior debt credit rating. Based on the Company's current credit rating, the spread for such loans will be 150 basis points under the Credit Facility, 175 basis points under both the $150.0 million three-year term loan and $100.0 million four-year term loan and 190 basis points under the $200.0 million seven-year term loan. At the Company's option, advances under the Credit Facility and term loans may also bear interest at a per annum floating rate equal to the higher of the prime rate or the federal funds rate plus 0.50% per annum. The Credit Facility contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loans to the Company at a reduced rate. The Company executed hedging transactions that fix the rate on the $200.0 million seven-year term loan at a 3.623% average rate for its full term, and the rate on the $150.0 million three-year term loan at a 2.596% average rate for periods of three to four years. All hedges commenced on February 1, 2012 and the rates are inclusive of the LIBOR spread based on our current investment grade rating. See Note 9 for details of the interest rate swaps entered into as of December 31, 2013.

The Credit Facility and term loans contain financial and operating covenants and restrictions. The Company was in compliance with all such restrictions and financial covenants as of December 31, 2013. In the event of a default related to the financing and operating covenants, the Company's dividend distributions are limited to the greater of 95% of funds from operations or the minimum amount necessary for the Company to maintain its status as a REIT.

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As of December 31, 2013, the Company’s aggregate scheduled principal payments of debt obligations, excluding amortization of discounts and premiums, were as follows (in thousands):

2014	$	232,375
2015	409,654
2016	467,705
2017	330,323
2018	336,954
Thereafter	822,454
Total principal payments	2,599,465
Net unamortized premiums/(discounts)	(4,084		)
Outstanding indebtedness	$	2,595,381

8. FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company determined the fair values disclosed below using available market information and discounted cash flow analyses as of December 31, 2013 and 2012, respectively. The discount rate used in calculating fair value is the sum of the current risk free rate and the risk premium on the date of measurement of the instruments or obligations. Considerable judgment is necessary to interpret market data and to develop the related estimates of fair value. Accordingly, the estimates presented are not necessarily indicative of the amounts that the Company could realize upon disposition. The use of different estimation methodologies may have a material effect on the estimated fair value amounts shown. The Company believes that the carrying amounts reflected in the consolidated balance sheets at December 31, 2013 and 2012 approximate the fair values for cash and cash equivalents, accounts receivable, other assets, accounts payable and accrued expenses.

The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands):

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Mortgage notes payable	$	669,762	$	715,244	$	443,942	$	486,412
Unsecured notes payable	$	1,401,093	$	1,471,041	$	1,430,343	$	1,553,123
Variable rate debt	$	528,610	$	526,693	$	597,610	$	595,693
Notes receivable	$	7,026	$	7,759	$	7,226	$	7,783

The fair value of the Company's unsecured notes payable is categorized at a Level 2 basis (as provided by the accounting standard for Fair Value Measurements and Disclosures). This is because the Company valued these instruments using quoted market prices as of December 31, 2013 and 2012. For the fair value of the Company's unsecured notes, the Company uses a discount rate based on the indicative new issue pricing provided by lenders.

The fair value of the Company's mortgage notes payable, variable rate debt and notes receivable are all categorized at a Level 3 basis (as provided by the accounting standard for Fair Value Measurements and Disclosures). The fair value of the variable rate debt was estimated using a discounted cash flow analysis valuation on the borrowing rates currently available to the Company for loans with similar terms and maturities, as applicable. The fair value of the mortgage debt was determined by discounting the future contractual interest and principal payments by a blended market rate for loans with similar terms, maturities and loan-to-value. The fair value of the notes receivable was determined by using the expected cash flows of the notes receivable, and discounting those cash flows using the market rate of interest for mortgage notes with a comparable level of risk. These financial instruments have been categorized as Level 3 because the Company considers the rates used in the valuation techniques to be unobservable inputs.

For the Company's mortgage loans, the Company uses an estimate based on its knowledge of the mortgage market. The weighted average discount rate for the combined variable rate debt and mortgage loans used as of December 31, 2013 was 4.534%. An increase in the discount rate used in the discounted cash flow model would result in a decrease to the fair value of the Company's long-term debt. Conversely, a decrease in the discount rate used in the discounted cash flow model would result in an increase to the fair value of the Company's long-term debt.

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9. RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS

Risk Management

In the course of its ongoing business operations, the Company encounters economic risk. There are three main components of economic risk: interest rate risk, credit risk and market risk. The Company is subject to interest rate risk on its interest-bearing liabilities. Credit risk is primarily the risk of inability or unwillingness of tenants to make contractually required payments and of counterparties on derivatives contracts to fulfill their obligations. Market risk is the risk of declines in the value of Company properties due to changes in rental rates, interest rates, supply and demand of similar products and other market factors affecting the valuation of properties.

Risks and Uncertainties

The ongoing recovery in the global economy has been much slower than anticipated and continue to have an influence on the volume of real estate transactions in the market and created credit stresses on many businesses. If the economy again deteriorates, vacancy rates may increase through 2014 and possibly beyond as the current economic climate continues to negatively impact tenants. The current financial markets also have an adverse effect on the Company’s Real Estate Venture partners and contractual counter parties, including counter parties in derivative contracts.

The Company’s Credit Facility, term loans and the indenture governing its unsecured public debt securities (Note 7) contain restrictions, requirements and other limitations on the ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt which it must maintain. The ability to borrow under the Credit Facility is subject to compliance with such financial and other covenants. In the event that the Company fails to satisfy these covenants, it would be in default under the Credit Facility, the term loans and the indenture and may be required to repay such debt with capital from other sources. Under such circumstances, other sources of capital may not be available, or may be available only on unattractive terms.

Availability of borrowings under the Credit Facility is subject to a traditional material adverse effect clause. Each time the Company borrows it must represent to the lenders that there have been no events of a nature which would have a material adverse effect on the business, assets, operations, condition (financial or otherwise) or prospects of the Company taken as a whole or which could negatively affect the ability of the Company to perform its obligations under the Credit Facility. While the Company believes that there are currently no material adverse effect events, it is possible that such an event could arise which would limit the Company’s borrowings under the Credit Facility. If an event occurs which is considered to have a material adverse effect, the lenders could consider the Company in default under the terms of the Credit Facility and any borrowings under the Credit Facility would become unavailable. If the Company is unable to obtain a waiver, this would have a material adverse effect on the Company’s financial position and results of operations.

The Company was in compliance with all financial covenants as of December 31, 2013. Management continuously monitors the Company’s compliance with and anticipated compliance with the covenants. Certain of the covenants restrict management’s ability to obtain alternative sources of capital. While the Company currently believes it will remain in compliance with its covenants, in the event that the economy deteriorates in the future, the Company may not be able to remain in compliance with such covenants, in which case a default would result absent a lender waiver.

Use of Derivative Financial Instruments

The Company’s use of derivative instruments is limited to the utilization of interest rate agreements or other instruments to manage interest rate risk exposures and not for speculative purposes. The principal objective of such arrangements is to minimize the risks and/or costs associated with the Company’s operating and financial structure, as well as to hedge specific transactions. The counterparties to these arrangements are major financial institutions with which the Company and its affiliates may also have other financial relationships. The Company is potentially exposed to credit loss in the event of non-performance by these counterparties. However, because of the high credit ratings of the counterparties, the Company does not anticipate that any of the counterparties will fail to meet these obligations as they come due. The Company does not hedge credit or property value market risks through derivative financial instruments.

The Company formally assesses, both at inception of a hedge and on an on-going basis, whether each derivative is highly-effective in offsetting changes in cash flows of the hedged item. If management determines that a derivative is not highly-effective as a hedge or if a derivative ceases to be a highly-effective hedge, the Company will discontinue hedge accounting prospectively. The related ineffectiveness would be charged to the consolidated statement of operations.

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The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.

To comply with the provisions of the accounting standard for fair value measurements and disclosures, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

The following table summarizes the terms and fair values of the Company's derivative financial instruments as of December 31, 2013 and 2012. The notional amounts provide an indication of the extent of the Company's involvement in these instruments at that time, but do not represent exposure to credit, interest rate or market risks (amounts presented in thousands and included in other liabilities on the Company's consolidated balance sheets).

Hedge Product	Hedge Type	Designation		Notional Amount				Strike		Trade Date	Maturity Date	Fair value
				12/31/2013		12/31/2012						12/31/2013			12/31/2012
Assets
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	549			(1,262		)
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.090	%	January 6, 2012	October 30, 2019	218			(1,129		)
				$	51,548	$	51,548					$	767		$	(2,391	)
Liabilities
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	(545	)	$	(8,859	)
Swap	Interest Rate	Cash Flow	(a)	77,000		77,000		2.703	%	December 9-13, 2011	February 1, 2016	(887		)	(1,343		)
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	(283		)	(458		)
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2011	May 1, 2015	(162		)	(245		)
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	(311		)	(914		)
				$	377,062	$	377,062					$	(2,188	)	$	(11,819	)

(a) Hedging unsecured variable rate debt.

The Company measures its derivative instruments at fair value and records them in the balance sheet as either an asset or liability. As of December 31, 2013, two interest rate swaps held asset positions and were included in other assets on the Company's consolidated balance sheet. The remaining swaps are included in other liabilities on the Company's consolidated balance sheet.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Concentration of Credit Risk

Concentrations of credit risk arise for the Company when multiple tenants of the Company are engaged in similar business activities, or are located in the same geographic region, or have similar economic features that impact in a similar manner their ability to meet contractual obligations, including those to the Company. The Company regularly monitors its tenant base to assess potential concentrations of credit risk. Management believes the current credit risk portfolio is reasonably well diversified and does not contain an unusual concentration of credit risk. No tenant accounted for 10% or more of the Company’s rents during 2013, 2012 and 2011. Conditions in the general economy and the global credit markets have had a significant adverse effect on numerous

F- 42

industries. The Company has tenants concentrated in various industries that may be experiencing adverse effects from the current economic conditions and the Company could be adversely affected if such tenants were to default under their leases.

10. DISCONTINUED OPERATIONS

For the years ended December 31, 2013, 2012 and 2011, income from discontinued operations relates to an aggregate of 32 properties containing approximately 2.3 million net rentable square feet that the Company has sold since January 1, 2011.

The following table summarizes revenue and expense information for the properties sold which qualify for discontinued operations reporting since January 1, 2011 (in thousands):

	Years ended December 31,
	2013		2012		2011
Revenue:
Rents	$	4,754	$	28,678	$	43,050
Tenant reimbursements	355		2,353		5,030
Termination fees	—		11		75
Other	123		378		110
Total revenue	5,232		31,420		48,265
Expenses:
Property operating expenses	1,839		8,687		13,940
Real estate taxes	649		3,468		5,356
Depreciation and amortization	1,921		10,208		16,178
Total operating expenses	4,409		22,363		35,474
Other income:
Interest income	2		7		3
Income from discontinued operations before gain on sale of interests in real estate	825		9,064		12,794
Net gain on disposition of discontinued operations	3,382		34,774		7,047
Income from discontinued operations	$	4,207	$	43,838	$	19,841

Discontinued operations have not been segregated in the consolidated statements of cash flows. Therefore, amounts for certain captions will not agree with respective data in the consolidated statements of operations.

11. NON-CONTROLLING INTERESTS IN THE PARENT COMPANY'S FINANCIAL STATEMENTS

Non-controlling interests in the Parent Company’s financial statements relate to redeemable common limited partnership interests in the Operating Partnership held by parties other than the Parent Company and properties which are consolidated but not wholly owned.

Operating Partnership

The aggregate book value of the non-controlling interests associated with the redeemable common limited partnership interests that were consolidated in the accompanying consolidated balance sheet of the Parent Company as of December 31, 2013 and December 31, 2012, was $20.3 million and $21.2 million, respectively. The Parent Company believes that the aggregate settlement value of these interests (based on the number of units outstanding and the closing price of the common shares on the balance sheet date) was approximately $24.8 million and $22.5 million, respectively, as of December 31, 2013 and December 31, 2012.

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12. BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Net (income) loss from continuing operations attributable to non-controlling interests	(357		)	(357		)	863			863			994			994
Amount allocable to unvested restricted shareholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred share dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred share redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common shareholders	31,362			31,362			(51,279		)	(51,279		)	(32,059		)	(32,059		)
Income from discontinued operations	4,207			4,207			43,838			43,838			19,841			19,841
Discontinued operations attributable to non-controlling interests	(55		)	(55		)	(797		)	(797		)	(778		)	(778		)
Discontinued operations attributable to common shareholders	4,152			4,152			43,041			43,041			19,063			19,063
Net income (loss) attributable to common shareholders	$	35,514		$	35,514		$	(8,238	)	$	(8,238	)	$	(12,996	)	$	(12,996	)
Denominator
Weighted-average shares outstanding	153,140,458			153,140,458			143,257,097			143,257,097			135,444,424			135,444,424
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average shares outstanding	153,140,458			154,414,311			143,257,097			143,257,097			135,444,424			135,444,424
Earnings per Common Share:
Income (loss) from continuing operations attributable to common shareholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.24	)	$	(0.24	)
Discontinued operations attributable to common shareholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common shareholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)

Redeemable common limited partnership units totaling 1,763,739 in 2013, 1,845,737 in 2012, and 2,698,647 in 2011 were excluded from the diluted earnings per share computations because they are not dilutive.

The contingent securities/share based compensation impact is calculated using the treasury stock method and relates to employee awards settled in shares of the Parent Company. The effect of these securities is anti-dilutive for periods that the Parent Company incurs a net loss from continuing operations available to common shareholders and therefore is excluded from the dilutive earnings per share calculation in such periods.

Unvested restricted shares are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the years ended December 31, 2013, 2012 and 2011, earnings representing nonforfeitable dividends were allocated to the unvested restricted shares issued to the Company’s executives and other employees under the 1997 Plan.

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Common and Preferred Shares

On December 10, 2013, the Parent Company declared a distribution of $0.15 per common share, totaling $23.9 million, which was paid on January 21, 2014 to shareholders of record as of January 6, 2014. On December 10, 2013, the Parent Company declared distributions on its Series E Preferred Shares to holders of record as of December 30, 2013. These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on January 15, 2014 to holders of Series E Preferred Shares totaled $1.7 million.

On November 5, 2013, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell, in at-the-market offerings, up to an aggregate amount of 16,000,000 common shares until November 5, 2016. This Offering Program replaced a prior continuous equity offering program which expired on March 10, 2013. The Parent Company may sell common shares in amounts and at times to be determined by the Parent Company. Actual sales will depend on a variety of factors to be determined by the Parent Company, including, among others, market conditions, the trading price of the Company’s common shares of beneficial interest and determinations by the Parent Company of the appropriate sources of funding. In conjunction with the Offering Program, the Parent Company engages sales agents who receive compensation, in aggregate, of up to 2% of the gross sales price per share sold. From inception of the Offering Program through December 31, 2013, the Parent Company has not sold any shares under the program, resulting in 16,000,000 remaining shares available for sale.

On April 10, 2013, the Parent Company closed a public offering of 12,650,000 common shares, inclusive of 1,650,000 common shares issued upon exercise by the underwriters of the option granted to them to purchase additional shares. The Parent Company contributed the net proceeds from the sale of shares, amounting to $181.5 million after deducting underwriting discounts and commissions and other offering expenses, to the Operating Partnership in exchange for partnership units of the Operating Partnership. The Operating Partnership continues to use the net proceeds for working capital, capital expenditures and other general corporate purposes, which may include acquisitions, developments and the repayment, repurchase and refinancing of debt.

Common Share Repurchases

The Parent Company maintains a share repurchase program under which it may repurchase its common shares from time to time in accordance with limits set by the Board of Trustees.

The Parent Company did not repurchase any shares under the share repurchase program during the year-ended December 31, 2013. As of December 31, 2013, the Parent Company may purchase an additional 539,200 shares under the program.

Repurchases may be made from time to time in the open market or in privately negotiated transactions, subject to market conditions and compliance with legal requirements. The share repurchase program does not contain any time limitation and does not obligate the Parent Company to repurchase any shares. The Parent Company may discontinue the program at any time.

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13. PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Amount allocable to unvested restricted unitholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred unit dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred unit redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common unitholders	31,719			31,719			(52,142		)	(52,142		)	(33,053		)	(33,053		)
Discontinued operations attributable to common unitholders	4,207			4,207			43,838			43,838			19,841			19,841
Net income (loss) attributable to common unitholders	$	35,926		$	35,926		$	(8,304	)	$	(8,304	)	$	(13,212	)	$	(13,212	)
Denominator
Weighted-average units outstanding	154,929,545			154,929,545			145,883,217			145,883,217			145,118,841			145,118,841
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average units outstanding	154,929,545			156,203,398			145,883,217			145,883,217			145,118,841			145,118,841
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.23	)	$	(0.23	)
Discontinued operations attributable to common unitholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common unitholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.09	)	$	(0.09	)

Unvested restricted units are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the years ended December 31, 2013, 2012 and 2011, earnings representing nonforfeitable dividends were allocated to the unvested restricted units.

Common Partnership Units and Preferred Mirror Units

The Operating Partnership issues partnership units to the Parent Company in exchange for the contribution of the net proceeds of any equity security issuance by the Parent Company. The number and terms of such partnership units correspond to the number and terms of the related equity securities issued by the Parent Company. In addition, the Operating Partnership may also issue separate classes of partnership units. Historically, the Operating Partnership has had the following types of partnership units outstanding (i) Preferred Partnership Units which have been issued to parties other than the Parent Company (ii) Preferred Mirror Partnership Units which have been issued to the Parent Company and (iii) Common Partnership Units which include both interests held by the Parent Company and those held by other limited partners. Each of these interests is described in more detail below.

Preferred Mirror Partnership Units

In exchange for the proceeds received in corresponding offerings by the Parent Company of preferred shares of beneficial interest, the Operating Partnership has issued to the Parent Company a corresponding amount of Preferred Mirror Partnership Units with terms consistent with that of the preferred securities issued by the Parent Company.

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Common Partnership Units (Redeemable and General)

The Operating Partnership has two classes of Common Partnership Units: (i) Class A Limited Partnership Interest which are held by both the Parent Company and outside third parties and (ii) General Partnership Interests which are held by the Parent Company (collectively, the Class A Limited Partnership Interest, and General Partnership Interests are referred to as “Common Partnership Units”). The holders of the Common Partnership Units are entitled to share in cash distributions from, and in profits and losses of, the Operating Partnership, in proportion to their respective percentage interests, subject to preferential distributions on the preferred mirror units and the preferred units.

The Common Partnership Units held by the Parent Company (comprised of both General Partnership Units and Class A Limited Partnership Units) are presented as partner’s equity in the consolidated financial statements. Class A Limited Partnership Interest held by parties other than the Parent Company are redeemable at the option of the holder for a like number of common shares of the Parent Company, or cash, or a combination thereof, at the election of the Parent Company. Because the form of settlement of these redemption rights are not within the control of the Operating Partnership, these Common Partnership Units have been excluded from partner’s equity and are presented as redeemable limited partnership units measured at the potential cash redemption value as of the end of the periods presented based on the closing market price of the Parent Company’s common shares at December 31, 2013, 2012 and 2011, which was $14.09, $12.19, $9.50, respectively. As of December 31, 2013 and 2012, 1,763,739 and 1,845,737 of Class A Units, respectively, were outstanding and owned by outside limited partners of the Operating Partnership.

On December 10, 2013, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $23.9 million, which was paid on January 21, 2014 to unitholders of record as of January 6, 2014.

On December 10, 2013, the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of December 30, 2013. These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on January 15, 2014 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million.

On November 5, 2013, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell, in at-the-market offerings, up to an aggregate amount of 16,000,000 common shares until November 5, 2013. This Offering Program replaced a prior continuous equity offering program which expired on March 10, 2013. The Parent Company may sell common shares in amounts and at times to be determined by the Parent Company. Actual sales will depend on a variety of factors to be determined by the Parent Company, including, among others, market conditions, the trading price of the Company’s common shares of beneficial interest and determinations by the Parent Company of the appropriate sources of funding. In conjunction with the Offering Program, the Parent Company engages sales agents who receive compensation, in aggregate, of up to 2% of the gross sales price per share sold. From inception of the Offering Program through December 31, 2013, the Parent Company has not sold any shares under the program, resulting in 16,000,000 remaining shares available for sale. Generally, the Parent Company contributes the net proceeds from the sales to the Operating Partnership, which the Operating Partnership in turn uses for general corporate purposes.

Common Unit Repurchases

The Parent Company did not repurchase any shares under its share repurchase program during the year-ended December 31, 2013 and accordingly, during the year-ended December 31, 2013, the Operating Partnership did not repurchase any units in connection with the Parent Company’s share repurchase program.

14. SHARE BASED COMPENSATION, 401(k) PLAN AND DEFERRED COMPENSATION

Stock Options

At December 31, 2013, options exercisable for 2,983,569 common shares were outstanding under the Parent Company's shareholder approved equity incentive plan. There were 184,429 options unvested as of December 31, 2013 and $0.1 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 0.2 years. During the years ended December 31, 2013, 2012 and 2011 the Company recognized compensation expense related to unvested options of $0.7 million, $1.6 million, and $1.4 million, respectively. During the years ended December 31, 2013, 2012 and 2011, the Company also capitalized a $0.1 million, $0.5 million and $0.4 million, respectively, of compensation expense as part of the Company’s review of employee salaries eligible for capitalization.

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Option activity as of December 31, 2013 and changes during the year-ended December 31, 2013 were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	3,337,549		$	14.85	5.95	$	—
Exercised	(236,318	)	$	9.86
Forfeited/Expired	(117,662	)	$	18.61
Outstanding at December 31, 2013	2,983,569		$	15.50	5.15	$	—
Vested/Exercisable at December 31, 2013	2,799,140		$	15.74	5.05	$	—

401(k) Plan

The Company sponsors a 401(k) defined contribution plan for its employees. Each employee may contribute up to 100% of annual compensation, subject to specific limitations under the Internal Revenue Code. At its discretion, the Company can make matching contributions equal to a percentage of the employee’s elective contribution and profit sharing contributions. Employees automatically vest in employer contributions. The Company contributions were $0.4 million in each of 2013, 2012 and 2011.

Restricted Share Awards

As of December 31, 2013, 563,713 restricted shares were outstanding under the 1997 Plan and vest over three to seven years from the initial grant date. The remaining compensation expense to be recognized at December 31, 2013 was approximately $1.9 million, and is expected to be recognized over a weighted average remaining vesting period of 1.1 years. During 2013 the Company recognized compensation expense related to outstanding restricted shares of $3.2 million, of which $0.6 million was capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the years ended December 31, 2012 and 2011, the Company recognized $3.4 million (of which $0.9 million was capitalized) and $3.2 million (of which $0.7 million was capitalized), respectively, of compensation expense included in general and administrative expense in the respective periods related to outstanding restricted shares.

The following table summarizes the Company’s restricted share activity during the year-ended December 31, 2013:

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2013	597,708		$	12.57
Granted	182,576		13.13
Vested	(208,306	)	13.13
Forfeited	(8,265	)	11.41
Non-vested at December 31, 2013	563,713		$	12.56

On February 25, 2013, the Compensation Committee of the Company’s Board of Trustees awarded 157,208 restricted shares to the Company’s executives. The restricted shares will cliff vest after three years from the grant date. The vesting of the restricted shares is also subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled, or be terminated without cause or retire in a qualifying retirement. Qualifying retirement means the recipient’s voluntary termination of employment after reaching at least age 57 and accumulating at least 15 years of service with the Company. In accordance with the accounting standard for stock-based compensation, the Company amortizes stock-based compensation costs through the qualifying retirement dates for those executives who meet the conditions for qualifying retirement during the scheduled vesting period.

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Restricted Performance Share Units Plan

On each of February 25, 2013, March 1, 2012 and March 2, 2011, the Compensation Committee of the Parent Company’s Board of Trustees awarded an aggregate of 231,093, 242,122, and 113,256 share-based awards, respectively, to its executives. These awards are referred to as Restricted Performance Share Units, or RPSUs. The RPSUs represent the right to earn common shares. The number of common shares, if any, deliverable to award recipients depends on the Company’s performance based on its total return to shareholders during the three years measurement period that commenced on January 1, 2013 (in the case of the February 25, 2013 awards), January 1, 2012 (in the case of the March 1, 2012 awards), and January 1, 2011 (in the case of the March 2, 2011 awards), and that ends on December 31, 2015, December 31, 2014 or December 31, 2013 (as applicable) or, if earlier, the date of a change of control. In the case of the awards made on February 25, 2013 and March 1, 2012, the Company's performance is compared to the shareholder return of REITs within an index over the measurement period for 50% of the RPSUs awarded on that date, with the remaining 50% being compared to the total shareholder return of REITs within the Company's proxy peer group over such period. In the case of the awards made on March 2, 2011, the Company's performance is compared to the total shareholder return of REITs within an index over the performance period. The vesting of RPSUs is contingent upon the continued employment of the participants through the performance periods (with exceptions for death, disability and qualifying retirement). Dividends are deemed credited to the performance units accounts and are applied to “acquire” additional RPSUs for the account of the unit holder at the price per common share on the dividend payment date. If earned, RPSUs will be settled in common shares in an amount that reflects both the number of RPSUs in the holder’s account at the end of the applicable measurement period and the Company’s total return to shareholders during the applicable three year measurement period relative to the total shareholder returns of the REITs within the index or peer group, as applicable.

On the date of each grant, the RPSUs were valued using a Monte Carlo simulation. The fair values of the 2013, 2012 and 2011 awards on the grant dates were $4.1 million, $4.1 million and $2.0 million, respectively. The fair values of each award are being amortized over the three year cliff vesting period. The vesting of RPSUs is subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled or retire in a qualifying retirement prior to the vesting date. In the case of two of the Company's executives who have employment agreements with the Company, the vesting of the restricted shares is also subject to acceleration if either executive were to be terminated without cause or resign for good reason. Qualifying retirement means the recipient’s voluntary termination of employment after reaching age 57 years and accumulating at least 15 years of service with the Company. In accordance with the accounting standard for stock-based compensation, the Company amortizes stock-based compensation costs through the qualifying retirement date for those executives who meet the conditions for qualifying retirement during the schedule vesting period.

For the year-ended December 31, 2013, the Company recognized total compensation expense for the 2013, 2012 and 2011 RPSU awards of $4.4 million of which $0.8 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation. For the year-ended December 31, 2012, the Company recognized total compensation expense for the 2012, 2011 and 2010 awards of $3.5 million related to this plan, of which $1.2 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation. During the year ended December 31, 2011, the Company recognized total compensation expense for the 2011, 2010, and 2009 awards of $1.7 million related to this plan, of which $0.5 million was capitalized as part of the Company’s policies for capitalizing eligible portions of employee compensation.

A total of 64,678 common shares vested on December 31, 2012 (the end of the three-year measurement period for the linked RPSUs) and were delivered to holders of the RPSUs on March 1, 2013 in settlement of the RPSUs. Holders of these RPSUs also received cash dividend equivalents to the cash dividends paid on common shares on February 8, 2013.

Employee Share Purchase Plan

The Parent Company’s shareholders approved the 2007 Non-Qualified Employee Share Purchase Plan (the “ESPP”), which is intended to provide eligible employees with a convenient means to purchase common shares of the Parent Company through payroll deductions and voluntary cash purchases at an amount equal to 85% of the average closing price per share for a specified period. Under the plan document, the maximum participant contribution for the 2013 plan year is limited to the lesser of 20% of compensation or $50,000. The ESPP allows the Parent Company to make open market purchases, which reflects all purchases made under the plan to date. In addition, the number of shares separately reserved for issuance under the ESPP is 1.25 million. During the year-ended December 31, 2013, employees made purchases under the ESPP of $0.3 million and the Company recognized $0.1 million of compensation expense related to the ESPP. During the years-ended December 31, 2012 and 2011, employees made purchases of $0.4 million under the ESPP, and the Company recognized $0.1 million of compensation expense related to the ESPP. Compensation expense represents the 15% discount on the purchase price. The Board of Trustees of the Parent Company may terminate the ESPP at its sole discretion at any time.

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Deferred Compensation

In January 2005, the Parent Company adopted a Deferred Compensation Plan (the “Plan”) that allows trustees and certain key employees to voluntarily defer compensation. Compensation expense is recorded for the deferred compensation and a related liability is recognized. Participants may elect designated benchmark investment options for the notional investment of their deferred compensation. The deferred compensation obligation is adjusted for deemed income or loss related to the investments selected. At the time the participants defer compensation, the Company records a liability, which is included in the Company’s consolidated balance sheet. The liability is adjusted for changes in the market value of the participant-selected investments at the end of each accounting period, and the impact of adjusting the liability is recorded as an increase or decrease to compensation cost.

The Company has purchased mutual funds which can be utilized as a funding source for the Company’s obligations under the Plan. Participants in the Plan have no interest in any assets set aside by the Company to meet its obligations under the Plan. For the years-ended December 31, 2013, 2012 and 2011 the Company recorded net increases in compensation costs of $0.2 million, $0.3 million and $0.1 million, respectively, net of investments in the company-owned policies and mutual funds.

Participants in the Plan may elect to have all or a portion of their deferred compensation invested in the Company’s common shares. The Company holds these shares in a rabbi trust, which is subject to the claims of the Company’s creditors in the event of the Company’s bankruptcy or insolvency. The Plan does not permit diversification of a participant’s deferral allocated to the Company common shares and deferrals allocated to Company common shares can only be settled with a fixed number of shares. In accordance with the accounting standard for deferred compensation arrangements where amounts earned are held in a rabbi trust and invested, the deferred compensation obligation associated with the Company’s common shares is classified as a component of shareholder’s equity and the related shares are treated as shares to be issued and are included in total shares outstanding. At December 31, 2013 and 2012, 0.3 million of such shares were included in total shares outstanding. Subsequent changes in the fair value of the common shares are not reflected in operations or shareholders’ equity of the Company.

15. DISTRIBUTIONS

	Years ended December 31,
	2013			2012			2011
	(in thousands, except per share amounts)
Common Share Distributions:
Ordinary income	$	0.52		$	0.39		$	0.37
Capital gain	—			—			—
Non-taxable distributions	0.08			0.21			0.23
Distributions per share	$	0.60		$	0.60		$	0.60
Percentage classified as ordinary income	87.00		%	65.00		%	61.67		%
Percentage classified as capital gain	—		%	—		%	—		%
Percentage classified as non-taxable distribution	13.00		%	35.00		%	38.33		%
Preferred Share Distributions:
Total distributions declared	$	6,900		$	10,405		$	7,992
Percentage classified as ordinary income	100.00		%	100.00		%	100.00		%

16. TAX CREDIT TRANSACTIONS

Historic Tax Credit Transaction

On November 17, 2008, the Company closed a transaction with US Bancorp (“USB”) related to the historic rehabilitation of the IRS Philadelphia Campus, a 862,692 square foot office building that is 100% leased to the IRS. On August 27, 2010, the Company completed the development of the IRS Philadelphia Campus and the IRS lease commenced. In connection with this completed development project, USB contributed to the Company $64.1 million of total project costs.

In exchange for its contributions to the development of the IRS Philadelphia Campus, USB is entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB does not have a material interest in the underlying economics of the property. This transaction includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest in the IRS Philadelphia Campus. The Company believes the put will be exercised and the amount attributed to that puttable non-controlling interest obligation is included in other liabilities and is being accreted to the expected fixed put price.

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Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide other guarantees to USB and that entitle the Company through fee arrangements to receive substantially all available cash flow from the IRS Philadelphia Campus, the Company concluded that the IRS Philadelphia Campus should be consolidated. The Company also concluded that capital contributions received from USB, in substance, are consideration that the Company receives in exchange for its obligation to deliver tax credits and other tax benefits to USB. These receipts other than the amounts allocated to the put obligation will be recognized as revenue in the consolidated financial statements beginning when the obligation to USB is relieved which occurs upon delivery of the expected tax benefits net of any associated costs. The tax credit is subject to 20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus. The total remaining USB contributions presented within the Company’s consolidated balance sheet amounted to $26.8 million as of December 31, 2013 and $39.1 million as of December 31, 2012. The contributions were recorded net of the amount allocated to non-controlling interest as described above of $2.8 million and $2.6 million at the end of the years ended December 31, 2013 and December 31, 2012, respectively, with the remaining balance being presented within deferred income. Beginning in September 2011 to September 2015, the Company recognized and will recognize the cash received as revenue net of allocated expenses over the five year credit recapture period as defined in the Internal Revenue Code within other income (expense) in its consolidated statements of operations. During the years-ended December 31, 2013 and 2012, the Company recognized $11.9 million of the cash received as revenue, net of $0.5 million of allocated expenses within other income (expense) in its consolidated statements of operations.

Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. The deferred cost at December 31, 2013 and December 31, 2012 is $1.0 million and $1.6 million, respectively, and are included in other assets in the Company’s consolidated balance sheet. Amounts included in interest expense related to the accretion of the non-controlling interest liability and the 2% return expected to be paid to USB on its non-controlling interest aggregate to $1.4 million for year-ended December 31, 2013 and $1.3 million for each of the years ended December 31, 2012 and 2011.

New Markets Tax Credit Transaction

On December 30, 2008, the Company entered into a transaction with USB related to the Cira South Garage in Philadelphia, Pennsylvania and expects to receive a net benefit of $7.8 million under a qualified New Markets Tax Credit Program (“NMTC”). The NMTC was provided for in the Community Renewal Tax Relief Act of 2000 (the “Act”) and is intended to induce investment capital in under-served and impoverished areas of the United States. The Act permits taxpayers (whether companies or individuals) to claim credits against their Federal income taxes for up to 39% of qualified investments in qualified, active low-income businesses or ventures.

USB contributed $13.3 million into the development of the Cira South Garage and as such it is entitled to substantially all of the benefits derived from the tax credit, but it does not have a material interest in the underlying economics of the Cira South Garage. This transaction also includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest. The Company believes the put will be exercised and an amount attributed to that obligation is included in other liabilities and is being accreted to the expected fixed put price. The said put price is insignificant.

Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide various other guarantees to USB, the Company concluded that the investment entities established to facilitate the NMTC transaction should be consolidated. The USB contribution of $13.3 million is included in deferred income on the Company’s consolidated balance sheets at each of the years ended December 31, 2013 and December 31, 2012. The USB contribution other than the amount allocated to the put obligation will be recognized as income in the consolidated financial statements when the tax benefits are delivered without risk of recapture to the tax credit investors and the Company’s obligation is relieved. The Company anticipates that it will recognize the net cash received as revenue within other income/expense in the year ended December 31, 2015. The NMTC is subject to 100% recapture for a period of seven years as provided in the Internal Revenue Code. The Company expects that the put/call provision will be exercised in 2017.

Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. The deferred cost at each of the years ended December 31, 2013 and December 31, 2012 is $5.3 million, and is included in other assets in the Company’s consolidated balance sheet.

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17. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table details the components of accumulated other comprehensive income (loss) of the Parent Company and the Operating Partnership as of and for the three years ended December 31, 2013 (in thousands):

Parent Company	Cash Flow Hedges
Balance at January 1, 2011	$	(1,945	)
Change during year	(4,499		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	212
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,079	)
Change during year	(7,338		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	187
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(15,918	)
Change during year	12,789
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	(152		)
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(2,995	)

Operating Partnership	Cash Flow Hedges
Balance at January 1, 2011	$	(2,080	)
Change during year	(4,499		)
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,426	)
Change during year	(7,338		)
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(16,452	)
Change during year	12,789
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(3,377	)

Over time, the unrealized gains and losses held in Accumulated Other Comprehensive Income (“AOCI”) will be reclassified to interest expense when the related hedged items are recognized in earnings. The current balance held in AOCI is expected to be reclassified to interest expense for realized losses on forecasted debt transactions over the related term of the debt obligation, as applicable.

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18. SEGMENT INFORMATION

During the year ended December 31, 2013, the Company was managing its portfolio within seven segments: (1) Pennsylvania, (2) Philadelphia Central Business District (CBD), (3) Metropolitan Washington D.C., (4) New Jersey/Delaware, (5) Richmond, Virginia, (6) Austin, Texas and (7) California. The Pennsylvania segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. The Metropolitan Washington, D.C. segment includes properties in Northern Virginia and southern Maryland. The New Jersey/Delaware segment includes properties in Burlington and Camden counties in New Jersey and in New Castle county in the state of Delaware. The Richmond, Virginia segment includes properties primarily in Albemarle, Chesterfield, Goochland and Henrico counties and one property in Durham, North Carolina. The Austin, Texas segment includes properties in Austin. On October 16, 2013, seven properties within the Austin portfolio were contributed to a newly formed real estate venture. After contributing the properties, the Company wholly owns only one property in Austin, Texas (For additional information, see Note 4). The California segment includes properties in Oakland, Concord, and Carlsbad. The corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions. Land held for development and construction in progress are transferred to operating properties by region upon completion of the associated construction or project.

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Segment information for the three years ended December 31, 2013, 2012 and 2011 are as follows (in thousands):

	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan Washington, D.C.			New Jersey/Delaware		Richmond, Virginia		Austin, Texas (a)			California		Corporate			Total
2013
Real estate investments, at cost:
Operating properties	$	1,199,105	$	1,300,666	$	1,214,965		$	414,716	$	310,397	$	36,856		$	192,584	$	—		$	4,669,289
Construction-in-progress																	74,174			74,174
Land inventory																	93,351			93,351
Total revenue	$	153,426	$	146,081	$	116,048		$	60,262	$	35,058	$	31,451		$	18,369	$	1,515		$	562,210
Property operating expenses, real estate taxes and third party management expenses	54,506		55,702		42,641			29,981		14,916		13,298			9,411		1,314			221,769
Net operating income	$	98,920	$	90,379	$	73,407		$	30,281	$	20,142	$	18,153		$	8,958	$	201		$	340,441
Investment in real estate ventures, at equity	$	17,272	$	19,975	$	59,905		$	—	$	1,400	$	81,960		$	—	$	—		$	180,512
Equity in income of real estate ventures	$	925	$	1,547	$	130		$	1,245	$	381	$	(564	)	$	—	$	—		$	3,664
2012
Real estate investments, at cost:
Operating properties	$	1,178,730	$	988,590	$	1,193,200		$	546,644	$	309,923	$	285,346		$	223,736	$	—		$	4,726,169
Construction-in-progress																	48,950			48,950
Land inventory																	102,439			102,439
Total revenue	$	150,075	$	131,592	$	107,656		$	59,671	$	35,701	$	32,379		$	17,463	$	1,142		$	535,679
Property operating expenses, real estate taxes and third party management expenses	52,657		50,787		41,485			28,506		14,484		13,951			9,043		(65		)	210,848
Net operating income	$	97,418	$	80,805	$	66,171		$	31,165	$	21,217	$	18,428		$	8,420	$	1,207		$	324,831
Investment in real estate ventures, at equity	$	33,160	$	27,859	$	49,169		$	17,294	$	1,245	$	64,828		$	—	$	—		$	193,555
Equity in income of real estate ventures	$	520	$	1,113	$	(648	)	$	1,803	$	269	$	(316	)	$	—	$	—		$	2,741
2011
Operating properties	$	1,218,071	$	953,870	$	1,255,803		$	545,657	$	307,698	$	257,694		$	254,287	$	—		$	4,793,080
Construction-in-progress																	25,083			25,083
Land inventory																	109,008			109,008
Total revenue	$	148,887	$	125,366	$	119,255		$	58,960	$	36,789	$	30,894		$	16,692	$	1,725		$	538,568
Property operating expenses, real estate taxes and third party management expenses	54,734		48,831		45,135			30,564		14,739		13,034			9,407		347			216,791
Net operating income	$	94,153	$	76,535	$	74,120		$	28,396	$	22,050	$	17,860		$	7,285	$	1,378		$	321,777
Investment in real estate ventures, at equity	$	5,264	$	13,397	$	24,671		$	6,168	$	1,163	$	65,144		$	—	$	—		$	115,807
Equity in income of real estate ventures	$	1,861	$	466	$	(277	)	$	1,157	$	510	$	58		$	—	$	—		$	3,775

(a) On October 16, 2013seven properties from the Austin portfolio were contributed to a newly formed real estate venture. Accordingly, the Company's 50% interest in the financial results of these seven properties for the period subsequent to October 16, 2013 is reported as a component of 'Equity in income of real estate ventures' in the Company's consolidated statements of operations and, as a result, no longer included as a component of net operating income. The Company acquired Four Points Centre in Austin, TX on December 19, 2013 and the financial results for this property are included in net operating income for the period owned. For additional information, see Notes 3 and 4 to our consolidated financial statements.

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Net operating income (“NOI”) is defined as total revenue less property operating expenses, real estate taxes and third party management expenses. Segment NOI includes revenue, real estate taxes and property operating expenses directly related to operation and management of the properties owned and managed within the respective geographical region. Segment NOI excludes property level depreciation and amortization, revenue and expenses directly associated with third party real estate management services, expenses associated with corporate administrative support services, and inter-company eliminations. NOI also does not reflect general and administrative expenses, interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. Trends in development and construction activities that could materially impact the Company’s results from operations are also not reflected in NOI. All companies may not calculate NOI in the same manner. NOI is the measure that is used by the Company to evaluate the operating performance of its real estate assets by segment. The Company also believes that NOI provides useful information to investors regarding its financial condition and results of operations because it reflects only those income and expenses recorded at the property level. The Company believes that net income, as defined by GAAP, is the most appropriate earnings measure. The following is a reconciliation of consolidated NOI to consolidated net income (loss), as defined by GAAP:

	Years Ended December 31,
	2013			2012			2011
Consolidated net operating income	$	340,441		$	324,831		$	321,777
Less:
Interest expense	(121,937		)	(132,939		)	(131,405		)
Interest expense - amortization of deferred financing costs	(4,676		)	(6,208		)	(4,991		)
Interest expense - financing obligation	(972		)	(850		)	—
Depreciation and amortization	(197,021		)	(188,382		)	(202,933		)
General and administrative expenses	(27,628		)	(25,413		)	(24,602		)
Plus:
Interest income	1,044			3,008			1,810
Historic tax credit transaction income	11,853			11,840			12,026
Recognized hedge activity	—			(2,985		)	—
Equity in income of real estate ventures	3,664			2,741			3,775
Net gain from remeasurement of investments in real estate ventures	6,866			—			—
Net gain on sales of interests in real estate	—			—			2,985
Net loss on sale of undepreciated real estate	(137		)	—			—
Net gain (loss) on real estate venture transactions	29,604			(950		)	(222		)
Loss on early extinguishment of debt	(2,119		)	(22,002		)	(2,776		)
Income (loss) from continuing operations	38,982			(37,309		)	(24,556		)
Income from discontinued operations	4,207			43,838			19,841
Net income (loss)	$	43,189		$	6,529		$	(4,715	)

F- 55

19. OPERATING LEASES

The Company leases properties to tenants under operating leases with various expiration dates extending to 2030. Minimum future rentals on non-cancelable leases at December 31, 2013 are as follows (in thousands):

Year	Minimum Rent
2014	$	471,918
2015	457,315
2016	416,467
2017	358,368
2018	299,619
Thereafter	1,403,003

Total minimum future rentals presented above do not include amounts to be received as tenant reimbursements for operating costs

20. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is involved from time to time in litigation on various matters, including disputes with tenants and disputes arising out of agreements to purchase or sell properties. Given the nature of the Company’s business activities, these lawsuits are considered routine to the conduct of its business. The result of any particular lawsuit cannot be predicted, because of the very nature of litigation, the litigation process and its adversarial nature, and the jury system. The Company will establish reserves for specific legal proceedings when we determine that the likelihood of an unfavorable outcome is probable and when the amount of loss is reasonably estimable. The Company does not expect that the liabilities, if any, that may ultimately result from such legal actions will have a material adverse effect on the consolidated financial position, results of operations or cash flows of the Company.

Letters-of-Credit

Under certain mortgages, the Company has funded required leasing and capital reserve accounts for the benefit of the mortgage lenders with letters-of-credit. There were no associated letters-of-credit at December 31, 2013 and December 31, 2012. Certain of the tenant rents at properties that secure these mortgage loans are deposited into the loan servicer’s depository accounts, which are used to fund debt service, operating expenses, capital expenditures and the escrow and reserve accounts, as necessary. Any excess cash is included in cash and cash equivalents.

Environmental

As an owner of real estate, the Company is subject to various environmental laws of federal, state, and local governments. The Company’s compliance with existing laws has not had a material adverse effect on its financial condition and results of operations, and the Company does not believe it will have a material adverse effect in the future. However, the Company cannot predict the impact of unforeseen environmental contingencies or new or changed laws or regulations on its current Properties or on properties that the Company may acquire.

F- 56

Ground Rent

Future minimum rental payments under the terms of all non-cancellable ground leases under which the Company is the lessee are expensed on a straight-line basis regardless of when payments are due. The Company’s ground leases have remaining lease terms ranging from 15 to 75 years. Minimum future rental payments on non-cancelable leases at December 31, 2013 are as follows (in thousands):

Year	Minimum Rent
2014	$	1,303
2015	1,303
2016	1,303
2017	1,303
2018	1,303
Thereafter	57,540
Total	64,055

The Company obtained ground tenancy rights related to two properties in Philadelphia, Pennsylvania, which provide for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the properties after certain returns are achieved by the Company. Such amounts, if any, will be reflected as contingent rent when incurred. The leases also provide for payment by the Company of certain operating costs relating to the land, primarily real estate taxes. The above schedule of future minimum rental payments does not include any contingent rent amounts or any reimbursed expenses.

Other Commitments or Contingencies

As part of the Company’s September 2004 acquisition of a portfolio of properties from The Rubenstein Company (which the Company refers to as the "TRC acquisition"), the Company acquired its interest in Two Logan Square, a 708,844 square foot office building in Philadelphia, primarily through its ownership of a second and third mortgage secured by this property. This property is consolidated, as the borrower is a variable interest entity and the Company, through its ownership of the second and third mortgages, is the primary beneficiary. The Company currently does not expect to take title to Two Logan Square until, at the earliest, September 2019. If the Company takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Company has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property an amount equal to $2.9 million. On the TRC acquisition date, the Company recorded a liability of $0.7 million and this amount will accrete up to $2.9 million through September 2019. As of December 31, 2013, the Company had a balance of $1.6 million for this liability in its consolidated balance sheet.

The Company was audited by the Internal Revenue Service (the “IRS”) for its 2004 tax year. The audit concerned the tax treatment of the TRC acquisition in September 2004 in which the Company acquired a portfolio of properties through the acquisition of a limited partnership. On December 17, 2010, the Company received notice that the IRS proposed an adjustment to the allocation of recourse liabilities allocated to the contributor of the properties. The Company appealed the proposed adjustment and during the second quarter of 2013, the IRS finalized a settlement agreement which will not result in a material liability to the Company for federal income taxes. The contributor of partnership interests in the 2004 transaction has agreed not to assert a claim against the Company for federal income tax purposes under the tax protection agreement entered into as part of the transaction.

As part of the Company’s 2006 merger with Prentiss Properties Trust ("Prentiss"), the 2004 TRC acquisition and several of our other transactions, the Company agreed not to sell certain of the properties it acquired in transactions that would trigger taxable income to the former owners. In the case of the TRC acquisition, the Company agreed not to sell acquired properties in non-exempt transactions for periods up to 15 years from the date of the TRC acquisition as follows at December 31, 2013: One Rodney Square and 130/150/170 Radnor Financial Center (January, 2015); and One Logan Square, Two Logan Square and Radnor Corporate Center (January, 2020). In the Prentiss acquisition, the Company assumed the obligation of Prentiss not to sell Concord Airport Plaza before March, 2018. The Company’s agreements generally provide that it may dispose of the subject properties only in transactions that qualify as tax-free exchanges under Section 1031 of the Internal Revenue Code or in other tax deferred transactions. If the Company were to sell a restricted property before expiration of the restricted period in a non-exempt transaction, the Company may be required to make significant payments to the parties who sold the applicable property on account of tax liabilities attributed to them. Similarly, as part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to not sell these two properties in certain taxable transactions prior to October 20, 2013 without the holder’s consent.

F- 57

As part of the Company’s acquisition of properties from time to time in tax-deferred transactions, the Company has agreed to provide certain of the prior owners of the acquired properties with the right to guarantee the Company’s indebtedness. If the Company were to seek to repay the indebtedness guaranteed by the prior owner before the expiration of the applicable agreement, the Company would be required to provide the prior owner an opportunity to guaranty qualifying replacement debt. These debt maintenance agreements may limit the Company’s ability to refinance indebtedness on terms favorable to the Company. As part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to maintain qualifying mortgage debt through October 20, 2021, in the amounts of not less than $130.0 million on One Commerce Square and $107.9 million on Two Commerce Square. Similarly, we have agreements in place with other contributors of assets to us that obligate us to maintain debt available for then to guaranty.

During 2008, in connection with the development of the IRS Philadelphia Campus and the Cira South Garage, the Company entered into a historic tax credit and a new market tax credit arrangement, respectively. The Company is required to be in compliance with various laws, regulations and contractual provisions that apply to its historic and new market tax credit arrangements. Non-compliance with applicable requirements could result in projected tax benefits not being realized and require a refund to USB or reduction of investor capital contributions, which are reported as deferred income in the Company’s consolidated balance sheet, until such time as its obligation to deliver tax benefits is relieved. The compliance periods for the tax credit arrangements run through 2015. The Company does not anticipate that any material refunds or reductions of investor capital contributions will be required in connection with these arrangements.

The Company invests in its properties and regularly incurs capital expenditures in the ordinary course to maintain the properties. The Company believes that such expenditures enhance its competitiveness. The Company also enters into construction, utility and service contracts in the ordinary course of business which may extend beyond one year. These contracts typically provide for cancellation with insignificant or no cancellation penalties.

21. SUBSEQUENT EVENTS

The Company has evaluated subsequent events through the date the financial statements were issued.

22. SUMMARY OF QUARTERLY RESULTS (UNAUDITED)

The following is a summary of quarterly financial information as of and for the years ended December 31, 2013 and 2012 (in thousands, except per share data):

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (a)
2013
Total revenue	$	139,554	$	140,644	$	143,354	$	138,658
Net income (loss)	3,919		7,180		11,088		21,002
Net income (loss) allocated to Common Shares	2,058		5,308		9,173		18,975
Basic earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
Diluted earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
2012
Total revenue	$	133,516	$	131,530	$	134,238	$	136,395
Net income (loss)	9,336		6,802		17,089		(26,698		)
Net income (loss) allocated to Common Shares	7,108		1,537		13,949		(30,832		)
Basic earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)
Diluted earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)

(a) The consolidated statement of operations for the fourth quarter of 2012 also contained an out of period deferred compensation expense adjustment of $0.6 million relating to the acceleration of deferred compensation for certain of our executive personnel who reached qualifying retirement conditions that should have been expensed in prior periods (please see Note 14 for further discussion regarding the qualifying retirement conditions). This resulted in an overstatement of expense by $0.6 million in the fourth quarter of 2012, and an understatement of expense by $0.2 million, $0.3 million, and a nominal amount in the third, second, and first quarters of 2012, respectively, and $0.1 million in the year-ended December 31, 2011. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment in the current year.

F- 58

The summation of quarterly earnings per share amounts do not necessarily equal the full year amounts due to rounding. The above information was updated to reclassify amounts previously reported to reflect discontinued operations. See Note 2 and Note 10.

F- 59

Brandywine Realty Trust and Brandywine Operating Partnership, L.P.

Schedule II

Valuation and Qualifying Accounts

(in thousands)

Description	Balance at Beginning of Year		Additions		Deductions (1)		Balance at End of Year
Allowance for doubtful accounts:
Year-ended December 31, 2013	$	16,646	$	1,384	$	1,782	$	16,248
Year-ended December 31, 2012	$	15,485	$	1,891	$	730	$	16,646
Year-ended December 31, 2011	$	15,222	$	928	$	665	$	15,485

(1) Deductions represent amounts that the Company had fully reserved for in prior years and pursuit of collection of such amounts was ceased during the year.

F- 60

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
PENNSYLVANIA SUBURBS
400 Berwyn Park	Berwyn	PA	—	2,657	4,462	13,711		2,657	18,172	20,829	5,478	1999	1999	40
300 Berwyn Park	Berwyn	PA	—	2,206	13,422	4,176		2,206	17,598	19,804	8,004	1989	1997	40
1050 Westlakes Drive	Berwyn	PA	—	2,611	10,445	5,046		2,611	15,490	18,101	7,264	1984	1999	40
1200 Swedesford Road	Berwyn	PA	—	2,595	11,809	3,533		2,595	15,341	17,936	5,464	1994	2001	40
200 Berwyn Park	Berwyn	PA	—	1,533	9,460	2,255		1,533	11,714	13,247	5,246	1987	1997	40
1180 Swedesford Road	Berwyn	PA	—	2,086	8,342	2,628		2,086	10,969	13,055	3,113	1987	2001	40
100 Berwyn Park	Berwyn	PA	—	1,180	7,290	2,173		1,180	9,462	10,642	4,241	1986	1997	40
1160 Swedesford Road	Berwyn	PA	—	1,781	7,124	1,412		2,088	8,228	10,316	2,491	1986	2001	40
1100 Cassett Road	Berwyn	PA	—	1,695	6,779	1,267		1,695	8,046	9,741	2,275	1997	2001	40
980 Harvest Drive	Blue Bell	PA	—	3,304	16,960	(110	)	3,303	16,850	20,153	6,542	1988	2002	40
925 Harvest Drive	Blue Bell	PA	—	1,671	6,606	759		1,671	7,364	9,035	3,265	1990	1998	40
920 Harvest Drive	Blue Bell	PA	—	1,209	6,595	(528	)	1,209	6,068	7,277	2,898	1990	1998	40
181 Washington Street	Conshohocken	PA	—	6,927	14,722	634		6,927	15,357	22,284	217	1999	2013	40
426 Lancaster Avenue	Devon	PA	—	1,689	6,756	395		1,689	7,152	8,841	3,259	1990	1998	40
52 Swedesford Square	East Whiteland Twp.	PA	—	4,241	16,579	2,630		4,241	19,209	23,450	7,560	1988	1998	40
One Progress Drive	Horsham	PA	—	1,399	5,629	5,214		1,399	10,843	12,242	3,818	1986	1996	40
500 Enterprise Drive	Horsham	PA	—	1,303	5,188	3,228		1,303	8,416	9,719	3,577	1990	1996	40
640 Freedom Business Center	King Of Prussia	PA	—	4,222	16,891	3,450		4,222	20,341	24,563	8,747	1991	1998	40
555 Croton Road	King of Prussia	PA	—	4,486	17,943	1,330		4,486	19,273	23,759	6,143	1999	2001	40
630 Allendale Road	King of Prussia	PA	—	2,836	4,028	12,223		2,636	16,450	19,086	5,264	2000	2000	40
620 Freedom Business Center	King Of Prussia	PA	—	2,770	11,014	3,755		2,770	14,770	17,540	7,286	1986	1998	40
1000 First Avenue	King Of Prussia	PA	—	2,772	10,936	2,787		2,772	13,723	16,495	5,949	1980	1998	40
1060 First Avenue	King Of Prussia	PA	—	2,712	10,953	2,728		2,712	13,681	16,393	6,016	1987	1998	40
630 Freedom Business Center	King Of Prussia	PA	—	2,773	11,144	1,971		2,773	13,115	15,888	5,856	1989	1998	40
1020 First Avenue	King Of Prussia	PA	—	2,168	8,576	4,522		2,168	13,098	15,266	5,999	1984	1998	40
1040 First Avenue	King Of Prussia	PA	—	2,860	11,282	586		2,860	11,868	14,728	4,859	1985	1998	40
610 Freedom Business Center	King Of Prussia	PA	—	2,017	8,070	2,369		2,017	10,440	12,457	4,388	1985	1998	40
650 Park Avenue	King Of Prussia	PA	—	1,916	4,378	1,771		1,916	6,149	8,065	2,722	1968	1998	40
500 North Gulph Road	King Of Prussia	PA	—	1,303	5,201	1,548		1,303	6,749	8,052	3,151	1979	1996	40
741 First Avenue	King Of Prussia	PA	—	1,287	5,151	11		1,287	5,162	6,449	2,242	1966	1998	40
751-761 Fifth Avenue	King Of Prussia	PA	—	1,097	4,391	31		1,097	4,422	5,519	1,917	1967	1998	40
620 Allendale Road	King Of Prussia	PA	—	1,020	3,839	654		1,020	4,493	5,513	1,869	1961	1998	40
600 Park Avenue	King Of Prussia	PA	—	1,012	4,048	385		1,012	4,433	5,445	1,925	1964	1998	40

F- 61

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
660 Allendale Road	King Of Prussia	PA	—	396	948	2,957		1,085	3,216	4,301	623	2011	1998	40
640 Allendale Road	King of Prussia	PA	—	439	432	1,579		439	2,012	2,451	722	2000	2000	40
101 Lindenwood Drive	Malvern	PA	—	4,152	16,606	3,722		4,152	20,329	24,481	6,569	1988	2001	40
301 Lindenwood Drive	Malvern	PA	—	2,729	10,915	2,667		2,729	13,582	16,311	4,424	1984	2001	40
300 Lindenwood Drive	Malvern	PA	—	848	3,394	1,265		848	4,659	5,507	1,889	1991	2001	40
100 Lindenwood Drive	Malvern	PA	—	473	1,892	208		473	2,100	2,573	729	1985	2001	40
200 Lindenwood Drive	Malvern	PA	—	324	1,295	339		324	1,634	1,958	557	1984	2001	40
14 Campus Boulevard	Newtown Square	PA	—	2,244	4,217	1,515		2,244	5,733	7,977	2,984	1998	1998	40
17 Campus Boulevard	Newtown Square	PA	—	1,108	5,155	(397	)	1,108	4,758	5,866	1,519	2001	1997	40
11 Campus Boulevard	Newtown Square	PA	—	1,112	4,067	672		1,112	4,739	5,851	1,812	1998	1999	40
15 Campus Boulevard	Newtown Square	PA	—	1,164	3,896	228		1,164	4,125	5,289	1,267	2002	2000	40
18 Campus Boulevard	Newtown Square	PA	—	787	3,312	(183	)	787	3,129	3,916	1,525	1990	1996	40
401 Plymouth Road	Plymouth Meeting	PA	—	6,198	16,131	17,096		6,198	33,226	39,424	10,394	2001	2000	40
4000 Chemical Road	Plymouth Meeting	PA	—	4,373	24,546	3,292		4,373	27,838	32,211	5,628	2006	2001	40
610 West Germantown Pike	Plymouth Meeting	PA	—	3,651	14,514	3,299		3,651	17,813	21,464	5,285	1987	2002	40
600 West Germantown Pike	Plymouth Meeting	PA	—	3,652	15,288	2,064		3,652	17,352	21,004	5,119	1986	2002	40
630 West Germantown Pike	Plymouth Meeting	PA	—	3,558	14,743	1,770		3,558	16,513	20,071	5,462	1988	2002	40
620 West Germantown Pike	Plymouth Meeting	PA	—	3,572	14,435	1,607		3,572	16,042	19,614	5,140	1990	2002	40
660 West Germantown Pike(d)	Plymouth Meeting	PA	—	—	—	17,488		—	17,488	17,488	688	1987	2012	30
2240/2250 Butler Pike	Plymouth Meeting	PA	—	1,104	4,627	1,333		1,104	5,960	7,064	3,324	1984	1996	40
2260 Butler Pike	Plymouth Meeting	PA	—	661	2,727	1,242		661	3,969	4,630	2,052	1984	1996	40
120 West Germantown Pike	Plymouth Meeting	PA	—	685	2,773	961		685	3,735	4,420	1,812	1984	1996	40
140 West Germantown Pike	Plymouth Meeting	PA	—	481	1,976	160		481	2,135	2,616	1,017	1984	1996	40
351 Plymouth Road	Plymouth Meeting	PA	—	1,043	555	—		1,043	555	1,598	121	N/A	2000	40
150 Radnor Chester Road	Radnor	PA	—	11,925	36,986	11,799		11,896	48,813	60,709	15,790	1983	2004	29
One Radnor Corporate Center	Radnor	PA	—	7,323	28,613	22,975		7,322	51,588	58,910	15,805	1998	2004	29
201 King of Prussia Road	Radnor	PA	—	8,956	29,811	5,214		8,948	35,032	43,980	13,938	2001	2004	25

555 Lancaster Avenue	Radnor	PA	—	8,014	16,508	18,993	8,609	34,906	43,515	12,970	1973	2004	24
Four Radnor Corporate Center	Radnor	PA	—	5,406	21,390	11,967	5,705	33,058	38,763	12,752	1995	2004	30
Five Radnor Corporate Center	Radnor	PA	—	6,506	25,525	5,124	6,578	30,577	37,155	6,918	1998	2004	38
Three Radnor Corporate Center	Radnor	PA	—	4,773	17,961	2,715	4,791	20,658	25,449	7,226	1998	2004	29
Two Radnor Corporate Center	Radnor	PA	—	3,937	15,484	3,872	3,942	19,350	23,292	6,031	1998	2004	29
130 Radnor Chester Road	Radnor	PA	—	2,573	8,338	3,491	2,567	11,834	14,401	3,825	1983	2004	25
170 Radnor Chester Road	Radnor	PA	—	2,514	8,147	1,678	2,509	9,831	12,340	3,316	1983	2004	25
200 Radnor Chester Road (d)	Radnor	PA	—	—	—	842	—	842	842	—	N/A	2005	N/A

F- 62

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
101 West Elm Street	W. Conshohocken	PA	—	6,251	25,209	2,784		6,251	27,992	34,243	6,556	1999	2005	40
1 West Elm Street	W. Conshohocken	PA	—	3,557	14,249	1,115		3,557	15,364	18,921	3,626	1999	2005	40
595 East Swedesford Road	Wayne	PA	—	2,729	10,917	2,307		2,729	13,225	15,954	3,946	1998	2003	40
575 East Swedesford Road	Wayne	PA	—	2,178	8,712	1,681		2,178	10,393	12,571	3,255	1985	2003	40
565 East Swedesford Road	Wayne	PA	—	1,872	7,489	1,820		1,872	9,309	11,181	2,840	1984	2003	40
585 East Swedesford Road	Wayne	PA	—	1,350	5,401	116		1,350	5,517	6,867	1,397	1998	2003	40
PHILADELPHIA CBD
2970 Market Street	Philadelphia	PA	190,964	22,430	217,763	10,591		22,430	228,354	250,784	21,169	2010	2007	40
2929 Arch Street	Philadelphia	PA	—	—	208,570	29,291		12,482	225,380	237,862	74,828	2005	N/A	40
1717 Arch Street	Philadelphia	PA	—	—	98,188	52,953		25,195	125,946	151,141	12,294	1990	2010	40
2001 Market Street	Philadelphia	PA	112,000	15,323	120,842	(642	)	15,323	120,200	135,523	107	1992	2013	40
130 North 18th Street	Philadelphia	PA	—	14,496	107,736	11,782		14,473	119,541	134,014	37,538	1998	2004	34
100 North 18th Street	Philadelphia	PA	88,583	16,066	100,255	6,038		16,066	106,293	122,359	32,227	1988	2004	36
2005 Market Street	Philadelphia	PA	125,089	15,161	122,486	(17,465	)	15,161	105,021	120,182	94	1987	2013	40
2930 Chestnut Street	Philadelphia	PA	40,101	—	76,008	2,586		—	78,594	78,594	6,606	2010	N/A	40
1900 Market Street	Philadelphia	PA	—	7,768	17,263	64		7,768	17,327	25,095	629	1981	2012	30
3020 Market Street	Philadelphia	PA	—	—	21,417	3,010		—	24,427	24,427	2,144	1959	2011	26
101 - 103 Juniper Street	Philadelphia	PA	—	—	14,401	324		478	14,247	14,725	1,340	2010	2006	40
Philadelphia Marine Center	Philadelphia	PA	—	532	2,196	3,196		628	5,296	5,924	2,186	Various	1998	40
METROPOLITAN WASHINGTON, D.C.
11720 Beltsville Drive	Beltsville	MD	—	3,831	16,661	3,982		3,903	20,571	24,474	5,743	1987	2006	46
11700 Beltsville Drive	Beltsville	MD	—	2,808	12,081	292		2,863	12,319	15,182	2,415	1981	2006	46
11710 Beltsville Drive	Beltsville	MD	—	2,278	11,100	(814	)	2,321	10,243	12,564	2,096	1987	2006	46
6600 Rockledge Drive	Bethesda	MD	—	—	37,421	11,538		—	48,960	48,960	12,867	1981	2006	50
11740 Beltsville Drive	Bethesda	MD	—	198	870	42		202	908	1,110	189	1987	2006	46
12015 Lee Jackson Memorial Highway	Fairfax	VA	—	3,770	22,895	3,665		3,842	26,489	30,331	6,016	1985	2006	42
11781 Lee Jackson Memorial Highway	Fairfax	VA	—	3,246	19,836	24		3,307	19,800	23,107	4,092	1982	2006	40
4401 Fair Lakes Court	Fairfax	VA	—	1,569	11,982	237		1,599	12,190	13,789	2,202	1988	2006	52
3141 Fairview Park Drive (e)	Falls Church	VA	21,630	5,918	40,981	11,545		7,081	51,365	58,446	9,049	1988	2006	51
2340 Dulles Corner Boulevard	Herndon	VA	—	16,345	65,379	18,280		16,129	83,875	100,004	24,559	1987	2006	40
2291 Wood Oak Drive	Herndon	VA	—	8,243	52,413	13,499		8,782	65,373	74,155	11,311	1999	2006	55
196/198 Van Buren Street	Herndon	VA	—	7,931	43,812	8,709		8,348	52,104	60,452	8,594	1991	2006	53
2251 Corporate Park Drive	Herndon	VA	—	11,472	45,893	2,055		11,472	47,948	59,420	8,434	2000	2006	40
2355 Dulles Corner Boulevard	Herndon	VA	—	10,365	43,876	4,528		10,365	48,405	58,770	10,863	1988	2006	40
2411 Dulles Corner Park	Herndon	VA	—	7,279	46,340	3,508		7,417	49,710	57,127	10,475	1990	2006	50
13880 Dulles Corner Lane	Herndon	VA	—	7,236	39,213	2,498		7,373	41,574	48,947	6,634	1997	2006	55

F- 63

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

							Gross Amount at Which Carried
				Initial Cost			December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition	Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
2121 Cooperative Way	Herndon	VA	—	5,598	38,639	2,292	5,795	40,734	46,529	6,598	2000	2006	54
2201 Cooperative Way	Herndon	VA	—	4,809	34,093	2,349	4,809	36,442	41,251	5,921	1990	2006	54
13825 Sunrise Valley Drive	Herndon	VA	—	3,794	19,365	1,032	3,866	20,326	24,192	3,521	1989	2006	46
1676 International Drive	Mclean	VA	59,698	18,437	97,538	2,501	18,785	99,691	118,476	17,693	1999	2006	55
8260 Greensboro Drive	Mclean	VA	31,697	7,952	33,964	1,794	8,102	35,608	43,710	6,461	1980	2006	52
1880 Campus Commons Drive	Reston	VA	—	6,164	28,114	6,315	6,281	34,312	40,593	5,754	1985	2006	52
2273 Research Boulevard	Rockville	MD	—	5,167	31,110	3,589	5,237	34,628	39,865	8,658	1999	2006	45
2275 Research Boulevard	Rockville	MD	—	5,059	29,668	2,964	5,154	32,537	37,691	6,474	1990	2006	45
2277 Research Boulevard	Rockville	MD	—	4,649	26,952	695	4,733	27,563	32,296	5,014	1986	2006	45
1900 Gallows Road	Vienna	VA	—	7,797	47,817	9,619	7,944	57,288	65,232	9,483	1989	2006	52
8521 Leesburg Pike	Vienna	VA	—	4,316	30,885	3,198	4,397	34,002	38,399	5,192	1984	2006	51
NEW JERSEY/DELAWARE
457 Haddonfield Road	Cherry Hill	NJ	—	2,142	9,120	1,334	2,142	10,454	12,596	4,884	1990	1996	40
200 Lake Drive East	Cherry Hill	NJ	—	2,069	8,275	1,299	2,069	9,573	11,642	3,264	1989	2001	40
220 Lake Drive East	Cherry Hill	NJ	—	2,144	8,798	646	2,144	9,443	11,587	3,152	1988	2001	40
210 Lake Drive East	Cherry Hill	NJ	—	1,645	6,579	1,110	1,645	7,689	9,334	2,509	1986	2001	40
20 East Clementon Road	Gibbsboro	NJ	—	769	3,055	530	769	3,585	4,354	1,574	1986	1997	40
10 Foster Avenue	Gibbsboro	NJ	—	244	971	78	244	1,049	1,293	470	1983	1997	40
7 Foster Avenue	Gibbsboro	NJ	—	231	921	123	231	1,044	1,275	435	1983	1997	40
50 East Clementon Road	Gibbsboro	NJ	—	114	964	3	114	967	1,081	428	1986	1997	40
2 Foster Avenue	Gibbsboro	NJ	—	185	730	16	185	746	931	333	1974	1997	40
4 Foster Avenue	Gibbsboro	NJ	—	183	726	5	183	732	915	324	1974	1997	40
1 Foster Avenue	Gibbsboro	NJ	—	93	364	76	93	440	533	219	1972	1997	40
5 U.S. Avenue	Gibbsboro	NJ	—	21	81	3	21	84	105	37	1987	1997	40
5 Foster Avenue	Gibbsboro	NJ	—	9	32	26	9	58	67	27	1968	1997	40

1120 Executive Boulevard	Marlton	NJ	—	2,074	8,415	2,061	2,074	10,475	12,549	4,687	1987	1997	40
Two Eves Drive	Marlton	NJ	—	818	3,461	341	818	3,802	4,620	1,795	1987	1997	40
Five Eves Drive	Marlton	NJ	—	703	2,819	532	703	3,351	4,054	1,519	1986	1997	40
Four B Eves Drive	Marlton	NJ	—	588	2,369	420	588	2,789	3,377	1,328	1987	1997	40
Four A Eves Drive	Marlton	NJ	—	539	2,168	123	539	2,291	2,830	1,050	1987	1997	40
308 Harper Drive	Moorestown	NJ	—	1,643	6,663	929	1,643	7,592	9,235	3,155	1976	1998	40
10000 Midlantic Drive	Mt. Laurel	NJ	—	3,206	12,857	4,335	3,206	17,192	20,398	7,087	1990	1997	40
700 East Gate Drive	Mt. Laurel	NJ	—	3,569	14,436	2,094	3,569	16,530	20,099	7,269	1984	1998	40
15000 Midlantic Drive	Mt. Laurel	NJ	—	3,061	12,254	1,600	3,061	13,854	16,915	6,211	1991	1997	40
1000 Howard Boulevard	Mt. Laurel	NJ	—	2,297	9,288	3,922	2,297	13,210	15,507	5,277	1988	1997	40
1000 Atrium Way	Mt. Laurel	NJ	—	2,061	8,180	4,867	2,061	13,047	15,108	5,896	1989	1997	40

F- 64

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013(c)	Year of Construction	Year Acquired	Depreciable Life
2000 Midlantic Drive	Mt. Laurel	NJ	—	2,202	8,823	2,490		2,202	11,313	13,515	4,752	1989	1997	40
701 East Gate Drive	Mt. Laurel	NJ	—	1,736	6,877	1,780		1,736	8,657	10,393	3,452	1986	1998	40
9000 Midlantic Drive	Mt. Laurel	NJ	—	1,472	5,895	1,880		1,472	7,776	9,248	3,142	1989	1997	40
307 Fellowship Drive	Mt. Laurel	NJ	—	1,565	6,342	1,292		1,565	7,634	9,199	3,189	1981	1998	40
305 Fellowship Drive	Mt. Laurel	NJ	—	1,421	5,768	1,611		1,421	7,378	8,799	2,831	1980	1998	40
303 Fellowship Drive	Mt. Laurel	NJ	—	1,493	6,055	851		1,493	6,907	8,400	2,902	1979	1998	40
309 Fellowship Drive	Mt. Laurel	NJ	—	1,518	6,154	644		1,518	6,798	8,316	2,927	1982	1998	40
1000 Bishops Gate	Mt. Laurel	NJ	—	934	6,287	412		934	6,700	7,634	2,350	2005	2000	40
161 Gaither Drive	Mt. Laurel	NJ	—	1,016	4,064	679		1,016	4,743	5,759	1,719	1987	2001	40
815 East Gate Drive	Mt. Laurel	NJ	—	636	2,584	708		636	3,292	3,928	1,353	1986	1998	40
4000 Midlantic Drive	Mt. Laurel	NJ	—	714	5,085	(1,982	)	714	3,103	3,817	1,455	1998	1997	40
817 East Gate Drive	Mt. Laurel	NJ	—	611	2,426	152		611	2,578	3,189	1,088	1986	1998	40
400 Commerce Drive	Newark	DE	—	2,528	9,220	1,048		2,528	10,268	12,796	3,627	1997	2002	40
100 Commerce Drive	Newark	DE	—	1,160	4,633	857		1,160	5,490	6,650	2,381	1989	1997	40
200 Commerce Drive	Newark	DE	—	911	4,414	1,018		911	5,432	6,343	2,012	1998	2002	40
Main Street - Plaza 1000	Voorhees	NJ	—	2,732	10,942	3,074		2,732	14,016	16,748	9,611	1988	1997	40
Main Street - Piazza	Voorhees	NJ	—	696	2,802	2,529		696	5,332	6,028	1,415	1990	1997	40
Main Street - Promenade	Voorhees	NJ	—	531	2,052	445		531	2,496	3,027	1,097	1988	1997	40
920 North King Street	Wilmington	DE	—	6,141	21,140	2,485		6,141	23,625	29,766	6,854	1989	2004	30
300 Delaware Avenue	Wilmington	DE	—	6,368	13,739	2,546		6,368	16,285	22,653	5,836	1989	2004	23
Two Righter Parkway	Wilmington	DE	—	2,802	11,217	6,264		2,802	17,481	20,283	4,069	1987	2001	40
One Righter Parkway	Wilmington	DE	—	2,545	10,195	5,088		2,545	15,282	17,827	7,982	1989	1996	40
RICHMOND
4364 South Alston Avenue	Durham	NC	—	1,622	6,419	1,031		1,580	7,491	9,071	3,010	1985	1998	40
4805 Lake Brooke Drive	Glen Allen	VA	—	1,640	6,567	1,136		1,640	7,703	9,343	2,953	1996	1998	40
Overlook I	Glen Allen	VA	—	748	3,976	600		790	4,533	5,323	439	1998	2011	40
Overlook II	Glen Allen	VA	—	748	4,492	77		790	4,526	5,316	475	2000	2011	40
2812 Emerywood Parkway	Henrico	VA	—	1,069	4,281	505		1,069	4,786	5,855	2,017	1980	1998	40
300 Arboretum Place	Richmond	VA	—	5,450	21,892	3,457		5,450	25,349	30,799	10,047	1988	1998	40
7501 Boulders View Drive	Richmond	VA	—	4,669	19,699	2,112		4,925	21,555	26,480	4,030	1989	2007	40
7300 Beaufont Springs Drive	Richmond	VA	—	4,672	19,689	1,906		4,922	21,345	26,267	3,534	2000	2007	40
6800 Paragon Place	Richmond	VA	—	4,552	18,414	2,020		4,552	20,434	24,986	4,057	1987	2006	40
6802 Paragon Place	Richmond	VA	—	2,917	11,454	2,912		2,917	14,366	17,283	4,666	1989	2002	40
1025 Boulders Parkway	Richmond	VA	—	2,574	11,297	1,573		2,824	12,620	15,444	2,100	1994	2007	40
2100-2116 West Laburnam Avenue	Richmond	VA	—	2,482	8,846	2,707		2,482	11,553	14,035	4,917	1984	1998	40
7401 Beaufont Springs Drive	Richmond	VA	—	2,349	10,396	992		2,599	11,138	13,737	1,904	1998	2007	40
7325 Beaufont Springs Drive	Richmond	VA	—	2,344	10,377	503		2,594	10,629	13,223	1,753	1999	2007	40

F- 65

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013(a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
9011 Arboretum Parkway	Richmond	VA	—	1,857	7,702	906		1,857	8,609	10,466	3,571	1991	1998	40
6806 Paragon Place	Richmond	VA	—	—	10,288	(105	)	403	9,780	10,183	2,297	2007	2005	40
9100 Arboretum Parkway	Richmond	VA	—	1,362	5,489	761		1,362	6,250	7,612	2,591	1987	1998	40
2511 Brittons Hill Road	Richmond	VA	—	1,202	4,820	1,221		1,202	6,041	7,243	2,652	1987	1998	40
100 Gateway Centre Parkway	Richmond	VA	—	391	5,410	616		391	6,027	6,418	1,725	2001	1998	40
9200 Arboretum Parkway	Richmond	VA	—	985	3,973	1,225		985	5,198	6,183	2,136	1987	1998	40
9210 Arboretum Parkway	Richmond	VA	—	1,110	4,474	527		1,110	5,001	6,111	2,151	1988	1998	40
2201-2245 Tomlynn Street	Richmond	VA	—	1,020	4,067	793		1,020	4,860	5,880	1,944	1989	1998	40
9211 Arboretum Parkway	Richmond	VA	—	582	2,433	886		582	3,320	3,902	1,206	1991	1998	40
2221-2245 Dabney Road	Richmond	VA	—	530	2,123	349		530	2,472	3,002	889	1994	1998	40
2212-2224 Tomlynn Street	Richmond	VA	—	502	2,014	395		502	2,409	2,911	938	1985	1998	40
2244 Dabney Road	Richmond	VA	—	550	2,203	37		550	2,240	2,790	947	1993	1998	40
2277 Dabney Road	Richmond	VA	—	507	2,034	241		507	2,274	2,781	889	1986	1998	40
2248 Dabney Road	Richmond	VA	—	512	2,049	131		512	2,181	2,693	898	1989	1998	40
2161-2179 Tomlynn Street	Richmond	VA	—	423	1,695	315		423	2,010	2,433	764	1985	1998	40
2246 Dabney Road	Richmond	VA	—	455	1,822	18		455	1,840	2,295	770	1987	1998	40
2251 Dabney Road	Richmond	VA	—	387	1,552	110		387	1,662	2,049	703	1983	1998	40
2256 Dabney Road	Richmond	VA	—	356	1,427	235		356	1,662	2,018	746	1982	1998	40
2130-2146 Tomlynn Street	Richmond	VA	—	353	1,416	169		353	1,585	1,938	636	1988	1998	40
2120 Tomlynn Street	Richmond	VA	—	281	1,125	179		281	1,304	1,585	560	1984	1998	40
2240 Dabney Road	Richmond	VA	—	264	1,059	98		264	1,157	1,421	451	1984	1998	40
Boulders Land	Richmond	VA	—	1,256	—	28		1,259	25	1,284	—	N/A	2007	N/A

F- 66

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

Schedule III

Real Estate and Accumulated Depreciation — December 31, 2013

(in thousands)

											Gross Amount at Which Carried
					Initial Cost						December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)		Land		Building and Improvements		Net Improvements (Retirements) Since Acquisition		Land		Building and Improvements		Total (b)		Accumulated Depreciation at December 31, 2013 (c)		Year of Construction	Year Acquired	Depreciable Life
AUSTIN
11305 Four Points Drive	Austin	TX	—		962		35,894		36,856		962		35,894		36,856		—		2008	2013	40
CALIFORNIA
5900 & 5950 La Place Court	Carlsbad	CA	—		3,706		11,185		3,401		3,955		14,337		18,292		3,015		1988	2006	48
5963 La Place Court	Carlsbad	CA	—		2,824		9,413		2,197		2,999		11,435		14,434		2,164		1987	2006	55
2035 Corte Del Nogal	Carlsbad	CA	—		3,261		6,077		1,175		3,499		7,015		10,514		1,902		1991	2006	39
1200 Concord Avenue	Concord	CA	—		6,395		24,664		809		6,515		25,352		31,867		6,693		1984	2006	34
1220 Concord Avenue	Concord	CA	—		6,476		24,966		260		6,476		25,226		31,702		6,375		1984	2006	34
155 Grand Avenue	Oakland	CA	—		13,556		54,267		5,764		13,557		60,031		73,588		11,951		1990	2007	40
Two Kaiser Plaza	Oakland	CA	—		7,841		—		—		7,841		—		7,841		—		N/A	2006	N/A
Oakland Lot B	Oakland	CA	—		4,342		—		—		4,342		—		4,342		—		N/A	2006	N/A
	Total:		$	669,762	$	634,189	$	3,454,900	$	617,057	$	680,513	$	3,988,776	$	4,669,289	$	983,808

(a) Excludes the effect of any net interest premium/(discount).

(b) Reconciliation of Real Estate:

The following table reconciles the real estate investments from January 1, 2011 to December 31, 2013 (in thousands):

	2013			2012			2011
Balance at beginning of year	$	4,726,169		$	4,793,080		$	4,834,111
Additions:
Acquisitions	347,510			50,579			31,454
Capital expenditures and assets placed into service	109,740			90,619			133,550
Less:
Dispositions	(474,275		)	(168,408		)	(163,971		)
Retirements	(39,855		)	(39,701		)	(42,064		)
Balance at end of year	$	4,669,289		$	4,726,169		$	4,793,080

The aggregate cost for federal income tax purposes is $4.0 billion as of December 31, 2013.

F- 67

(c) Reconciliation of Accumulated Depreciation:

The following table reconciles the accumulated depreciation on real estate investments from January 1, 2011 to December 31, 2013 (in thousands):

	2013			2012			2011
Balance at beginning of year	$	954,665		$	865,710		$	776,078
Additions:
Depreciation expense — continuing operations	150,236			154,095			157,691
Depreciation expense — discontinued operations	9,164			2,143			1,185
Less:
Dispositions	(91,890		)	(28,270		)	(62,022		)
Retirements	$	(38,367	)	$	(39,013	)	$	(7,222	)
Balance at end of year	$	983,808		$	954,665		$	865,710

(d) Total net improvements since acquisition for these development properties do not include amounts allocated to construction-in-progress, as shown within the Company's consolidated balance sheet as of December 31, 2013.

(e) This property was contributed to an unconsolidated real estate venture, however, the Company will continue to consolidate this property due to its continuing involvement in this property resulting from its ongoing lease at this property and its 50% ownership interest in the venture. Please see Note 3 to the consolidated financial statements for additional information.

F- 68

EX-3.1.29

EXHIBIT 3.1.29

ADMITTED PARTNERS OF

BRANDYWINE OPERATING PARTNERSHIP, L.P.

AS OF DECEMBER 31, 2013

Jack R. Loew

Brandywine Holdings I, Inc.

Brandywine Realty Trust

R. Randle Scarborough

Steven L. Shapiro

Brookstone Investors, LLC

Brookstone Holdings of Delaware 4, LLC

Brookstone Holdings of Delaware 5, LLC

Brookstone Holdings of Delaware 6, LLC

Hirshman Family Trust

Trust UTW of Theodore Geffner

Gloria Kantor

Helen Geffner

Howard Kantor

Leo Guthart

William H. Goodwin, Jr.

TRC Associates Limited Partnership

The F.M. (Bruce) Brusseau Trust

Newport National Corporation

Scott R. Brusseau

D. Kent Dahlke

Kenneth L. Hatfield

Michael G. Tombari

James J. Gorman

Christopher J. Knauer

The Jon Q. Reynolds and Ann S. Reynolds Family Trust

The David A. Brown Family Trust

The Revocable Trust Declaration of Thomas K. Terrill and Susan Jean Terrill

The Redford Family Trust

The Judith B. Brown 1992 Trust

The Peter M. Reynolds and Christina A. Reynolds Family Trust

C. Thomas Martz

Karen Leigh Brown

Tara Lynne Brown

Kristen Ann Brown

The Reynolds Family Partners

GENERAL PARTNER

Brandywine Realty Trust

EX-10.16

Exhibit 10.16

Non-Employee Trustee Compensation

(as revised December 10, 2013)

1.Annual Fee:

a.$45,000.

b.payable at annual meeting of shareholders.

c.payable in cash or common shares (valued at closing price on date of annual meeting of shareholders), at the election of each non-employee Trustee.

d.cash portion is eligible for deferral into the Deferred Compensation Plan.

2.Annual Equity Award:

a.$70,000 in “restricted” common share rights.

b.number of common share rights computed based on closing price of the common shares on date of annual meeting of shareholders.

c.common share rights vest in three equal annual installments, commencing on the first anniversary of the award date, subject to accelerated vesting upon a change of control or termination of service on account of death, disability or retirement. Upon vesting, a number of common shares are delivered equal to the number of share rights that vested. [See “Miscellaneous” below for additional shares issuable upon a change of control or termination of service on account of death, disability or retirement.]

d.unvested common share rights are entitled to dividend equivalents.

e.common share rights are not eligible for deferral into the Deferred Compensation Plan.

3.Per Board Meeting Fee:

a.$1,500.

b.payable in cash.

c.eligible for deferral into the Deferred Compensation Plan.

4.Per Committee Meeting Fee:

a.$1,500.

b.payable in cash.

c.not eligible for deferral into the Deferred Compensation Plan.

5.Per informal Board Informational Meeting Fee:

a.$1,500.

b.payable in cash.

c.not eligible for deferral into the Deferred Compensation Plan.

6.Chair Fees:

a.Board Chair - $50,000 per year, payable in cash, at annual meeting of shareholders.

b.Audit Committee Chair - $20,000 per year, payable in cash, at annual meeting of shareholders.

c.Compensation Committee Chair - $12,500 per year, payable in cash, at annual meeting of shareholders.

d.Corporate Governance Committee Chair - $12,500 per year, payable in cash, at annual meeting of shareholders.

e.Chair fees are not eligible for deferral into the Deferred Compensation Plan.

7.Miscellaneous: Fees are payable for meeting attendance, whether in person or by phone.

8.Additional Share Issuance.

a.Upon the occurrence of a change of control, each non-employee Trustee shall be entitled to receive a number of fully-vested common shares (in addition to any shares or rights to shares on account of prior awards) having an aggregate value (based on the closing price of the common shares on the trading day immediately prior to the consummation of the change of control) equal to $70,000 multiplied by a fraction the numerator of which is the number of days that elapsed between the annual meeting of shareholders next preceding the date of consummation of the change of control and the date of consummation of the change of control, and the denominator of which is 365.

b.Upon the death, disability or retirement of a non-employee Trustee, the non-employee Trust or his or her personal representative shall be entitled to a number of fully-vested common shares (in addition to any shares or rights to shares on account of prior awards) having an aggregate value (based on the closing price of the common shares on the trading day immediately prior to the death, disability or retirement) equal to $70,000 multiplied by a fraction the numerator of which is the number of days that elapsed between the annual meeting of shareholders next preceding the date of the death, disability or retirement of the non-employee Trustee and such date of death, disability or retirement, and the denominator of which is 365.

9.Effective Date of Changes. The change in the fee amount for attendance at Board Informational meetings to the level specified above shall be effective January 1, 2014. The change in the Committee Chair fees and the dollar amount of the annual equity awards shall be effective for payments and awards from and after the 2014 annual shareholders meeting.

EX-12.1

Exhibit 12.1

Brandywine Realty Trust
Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Share Distributions
(in thousands)
	For the years ended December 31,
	2013			2012			2011			2010				2009
Earnings before fixed charges:
Add:
Income (loss) from continuing operations before non-controlling interest and equity in earnings from unconsolidated real estate ventures	$	35,318		$	(40,050	)	$	(28,331	)	$	(48,305	)	(a)	$	(12,985	)	(a)
Distributed income of equity investees	1,650			1,224			2,600			657				1,557
Amortization of capitalized interest	3,557			3,538			3,564			3,527				3,166
Fixed charges - per below	132,146			147,077			140,356			148,500				153,042
Less:
Capitalized interest	(3,137		)	(2,560		)	(1,997		)	(10,385		)		(8,893		)
Earnings before fixed charges	$	169,534		$	109,229		$	116,192		$	93,994			$	135,887
Fixed charges and Preferred Distributions:
Interest expense from continuing operations (including amortization)	$	127,585		$	142,982		$	136,396		$	136,410			$	142,520
Capitalized interest	3,137			2,560			1,997			10,385				8,893
Ground leases and other	1,424			1,535			1,963			1,705				1,629
Total Fixed Charges	132,146			147,077			140,356			148,500				153,042
Income allocated to preferred shareholders	6,900			10,405			7,992			7,992				7,992
Total Preferred Distributions	6,900			10,405			7,992			7,992				7,992
Total combined fixed charges and preferred distributions	$	139,046		$	157,482		$	148,348		$	156,492			$	161,034
Ratio of earnings to combined fixed charges and preferred distributions	$	30,488		(b)			(b)			(b)				(b)
(a) Amounts for the years ended December 31, 2010 and 2009 have been reclassified to present properties sold. As a result, operations have been reclassified to discontinued operations from continuing operations for all periods presented.
(b) Due to the registrant's loss in the period, the coverage ratio was less than 1:1. The registrant must generate additional earnings of $48,253 for the year ended December 31, 2012, $32,156 for the year ended December 31, 2011, $62,498 for the year ended December 31, 2010, and $25,147 for the year ended December 31, 2009 to achieve a coverage ratio of 1:1.

EX-12.2

Exhibit 12.2

Brandywine Operating Partnership, L.P.
Computation of Ratio of Earnings to Combined Fixed Charges
(in thousands)
	For the years ended December 31,
	2013			2012			2011			2010				2009
Earnings before fixed charges:
Add:
Income (loss) from continuing operations before non-controlling interest and equity in earnings from unconsolidated real estate ventures	$	35,318		$	(40,050	)	$	(28,331	)	$	(48,305	)	(a)	$	(12,985	)	(a)
Distributed income of equity investees	1,650			1,224			2,600			657				1,557
Amortization of capitalized interest	3,557			3,538			3,564			3,527				3,166
Fixed charges - per below	132,146			147,077			140,356			148,500				153,042
Less:
Capitalized interest	(3,137		)	(2,560		)	(1,997		)	(10,385		)		(8,893		)
Earnings before fixed charges	$	169,534		$	109,229		$	116,192		$	93,994			$	135,887
Fixed charges:
Interest expense from continuing operations (including amortization)	$	127,585		$	142,982		$	136,396		$	136,410			$	142,520
Ground leases and other	3,137			2,560			1,997			10,385				8,893
Capitalized interest	1,424			1,535			1,963			1,705				1,629
Total Fixed Charges	$	132,146		$	147,077		$	140,356		$	148,500			$	153,042
Ratio of earnings to combined fixed charges	37,388			(b)			(b)			(b)				(b)
(a) Amounts for the years ended December 31, 2009 and 2008 have been reclassified to present properties sold. As a result, operations have been reclassified to discontinued operations from continuing operations for all periods presented.
(b) Due to the registrant's loss in the period, the coverage ratio was less than 1:1. The registrant must generate additional earnings of $37,848 for the year ended December 31, 2012, $24,164 for the year ended December 31, 2011, $54,506 for the year ended December 31, 2010, and $17,155 for the year ended December 31, 2009 to achieve a coverage ratio of 1:1.

EX-21

Exhibit 21

List of Subsidiaries

AAPOP 2, L.P., a Delaware limited partnership

B Chestnut LP, a Delaware limited partnership

BDN 1919 Sub LP, a Delaware limited partnership

BDN Four Points LP, a Delaware limited partnership

BDN Four Points Land LP, a Delaware limited partnership

BDN Four Points Preserve LP, a Delaware limited partnership

BDN Millennium LP, a Delaware limited partnership

BDN Real Estate Fund I LP, a Delaware limited partnership

Brandywine Ambassador, L.P., a Pennsylvania limited partnership

Brandywine Acquisition Partners LP, a Delaware limited partnership

Brandywine Austin Properties I LP, a Texas limited partnership

Brandywine Byberry LP, a Delaware limited partnership

Brandywine Central, L.P., a Pennsylvania limited partnership

Brandywine Cira Chestnut I LP. a Delaware limited partnership

Brandywine Cira Garage I LP, a Delaware limited partnership

Brandywine Cira, L.P., a Pennsylvania limited partnership

Brandywine Cira PO LP, a Delaware limited partnership

Brandywine Cira Post Office LP, a Delaware limited partnership

Brandywine Cira South LP, a Delaware limited partnership

Brandywine Cira Walnut I LP, a Delaware limited partnership

Brandywine Commerce I LP, a Delaware limited partnership

Brandywine Commerce II LP, a Delaware limited partnership

Brandywine Croton, L.P., a Pennsylvania limited partnership

Brandywine Dominion, L.P., a Pennsylvania limited partnership

Brandywine F.C., L.P., a Pennsylvania limited partnership

Brandywine Grande B, L.P., a Delaware limited partnership

Brandywine Grande C, L.P., a Delaware limited partnership

Brandywine Greensboro Drive LP, a Delaware limited partnership

Brandywine International Drive LP, a Delaware limited partnership

Brandywine Industrial Partnership, L.P., a Delaware limited partnership

Brandywine Metroplex, L.P., a Pennsylvania limited partnership

Brandywine Midatlantic, LP, a Delaware limited partnership

Brandywine Office Investors LP, a Delaware limited partnership

Brandywine Operating Partnership, L.P., a Delaware limited partnership

Brandywine P.M., L.P., a Pennsylvania limited partnership

Brandywine Properties Management LP, a Texas limited partnership

Brandywine TB Florig, L.P., a Pennsylvania limited partnership

Brandywine TB Inn, L.P., a Pennsylvania limited partnership

Brandywine TB I, L.P., a Pennsylvania limited partnership

Brandywine TB II, L.P., a Pennsylvania limited partnership

Brandywine TB V, L.P., a Pennsylvania limited partnership

Brandywine TB VI, L.P., a Pennsylvania limited partnership

Brandywine TB VII, L.P., a Pennsylvania limited partnership

Brandywine TB VIII, L.P., a Pennsylvania limited partnership

Brandywine 1177 Beltline Associates, L.P., a Texas limited partnership

BT Plymouth LP, a Delaware limited partnership

C/N Iron Run Limited Partnership III, a Pennsylvania limited partnership

C/N Leedom Limited Partnership II, a Pennsylvania limited partnership

C/N Oaklands Limited Partnership I, a Pennsylvania limited partnership

C/N Oaklands Limited Partnership III, a Pennsylvania limited partnership

Commerce Square Partners - Philadelphia Plaza, L.P., a Delaware limited partnership

Concord Airport Plaza Associates, LP, a California limited partnership

Eight/Oliver Brandywine Partner, L.P., a Pennsylvania limited partnership

e-Tenants.com Holding, L.P., a Pennsylvania limited partnership

Fifteen Horsham, L.P., a Pennsylvania limited partnership

Five/Oliver Brandywine Partner, L.P., a Pennsylvania limited partnership

Four Tower Bridge Associates, a Pennsylvania limited partnership

G&I VII Barton Creek LP, a Delaware limited partnership

G&I VII Barton Skyway LP, a Delaware limited partnership

G&I VII Cielo, LP a Delaware limited partnership

G&I VII Lantana, LP a Delaware limited partnership

Iron Run Limited Partnership V, a Pennsylvania Limited Partnership

LC/N Horsham Limited Partnership, a Pennsylvania limited partnership

LC/N Keith Valley Limited Partnership I, a Pennsylvania limited partnership

Newtech IV Limited Partnership, a Pennsylvania limited partnership

New Two Logan, LP, a Pennsylvania limited partnership

Nichols Lansdale Limited Partnership III, a Pennsylvania limited partnership

OLS Office Partners, L.P., a Delaware limited partnership

One Rockledge Associates Limited Partnership, a Massachusetts limited partnership

Philadelphia Plaza - Phase II LP, a Pennsylvania limited partnership

Radnor Center Associates, a Pennsylvania limited partnership

Radnor Properties Associates-II, L.P., a Pennsylvania limited partnership

Radnor Properties-SDC, L.P., a Delaware limited partnership

Radnor Properties-200 RC Holdings, L.P., a Delaware limited partnership

Radnor Properties-200 RC, L.P., a Delaware limited partnership

Radnor Properties-201 KOP, L.P., a Delaware limited partnership

Radnor Properties-555 LA, L.P., a Delaware limited partnership

Two Logan Holdings LP, a Pennsylvania limited partnership

Two Logan Square Associates, a Pennsylvania limited partnership

Tower Bridge Inn Associates, a Pennsylvania limited partnership

Witmer Operating Partnership I, L.P., a Delaware limited partnership

100 Arrandale Associates, L.P., a Pennsylvania limited partnership

111 Arrandale Associates, L.P., a Pennsylvania limited partnership

440 Creamery Way Associates, L.P., a Pennsylvania limited partnership

442 Creamery Way Associates, L.P., a Pennsylvania limited partnership

481 John Young Way Associates, L.P., a Pennsylvania limited partnership

1919 Market Street LP, a Delaware limited partnership

2928 Walton Road LP, a Pennsylvania limited partnership

3020 Market Holding LP, a Delaware limited partnership

3020 Market Operating LP, a Delaware limited partnership

Interstate Center Associates, a Virginia general partnership

Plymouth TFC, General Partnership, a Pennsylvania general partnership

Brandywine 1919 Ventures, a Delaware general partnership

AAPOP 1 LLC, a Delaware limited liability company

Atlantic American Land Development LLC, a Delaware limited liability company

BDN 1919 Sub GP LLC, a Delaware limited liability company

BDN Four Points GP LLC, a Delaware limited liability company

BDN Four Points Land GP LLC, a Delaware limited liability company

BDN Four Points Preserve GP LLC, a Delaware limited liability company

BDN Management Inc, a Delaware corporation

Brandywine Holdings, I, Inc., a Pennsylvania corporation

Brandywine Properties I Limited Inc., a Delaware corporation

Brandywine Realty Services Corporation, a Pennsylvania corporation

Brandywine Resources I Inc., a Delaware corporation

BTRS, Inc., a Delaware corporation

BTRS Sub One Inc., a Delaware corporation

Southpoint Land Holdings, Inc., a Pennsylvania corporation

Valleybrooke Land Holdings, Inc., a Pennsylvania corporation

B Chestnut GP LLC, a Delaware limited liability company

BDN Austin Properties LLC, a Delaware limited liability company

BDN Brokerage LLC, a Pennsylvania limited liability company

BDN GC Services LLC, a Delaware limited liability company

BDN GP Real Estate Fund I LLC, a Delaware limited liability company

BDN Millennium GP, LLC, a Delaware limited liability company

BDN Millennium Holding Company, LLC, a Delaware limited liability company

BDN Properties I LLC, a Delaware limited liability company

BDN Venture LLC, a Delaware limited liability company

BOI Carlsbad LLC, a Delaware limited liability company

BOI Pacific Ridge LLC, a Delaware limited liability company

BRE/Logan I, L.L.C., a Delaware limited liability company

BRE/Logan II, L.L.C., a Delaware limited liability company

Brandywine Ambassador, L.L.C., a Pennsylvania limited liability company

Brandywine Austin I LLC, a Delaware limited liability company

Brandywine Boulders, LLC, a Delaware limited liability company

Brandywine Brokerage Services, LLC, A New Jersey limited liability company

Brandywine Byberry LLC, a Delaware limited liability company

Brandywine Calverton LLC, a Delaware limited liability company

Brandywine Charlottesville LLC, a Virginia limited liability company

Brandywine Christina LLC, a Delaware limited liability company

Brandywine Cira Brokerage LLC, d Delaware limited liability company

Brandywine Cira Chestnut LLC, a Delaware limited liability company

Brandywine Cira Garage LLC, a Delaware limited liability company

Brandywine Cira Garage Holding LLC, a Delaware limited liability company

Brandywine Cira Garage Holding MM LLC, a Delaware limited liability company

Brandywine Cira, LLC, a Pennsylvania limited liability company

Brandywine Cira PO LLC, a Delaware limited liability company

Brandywine Cira PO Developer LLC, a Delaware limited liability company

Brandywine Cira PO Master Tenant LLC, a Delaware limited liability company

Brandywine Cira Post Office LLC, a Delaware limited liability company

Brandywine Cira South GP LLC, a Delaware limited liability company

Brandywine Cira Walnut LLC, a Delaware limited liability company

Brandywine Commerce I GP LLC, a Delaware limited liability company

Brandywine Commerce II GP LLC, a Delaware limited liability company

Brandywine Commerce Sub I LLC, a Delaware limited liability company

Brandywine Commerce Sub II LLC, a Delaware limited liability company

Brandywine Continental LLC, a Delaware limited liability company

Brandywine Croton, LLC, a Pennsylvania limited liability company

Brandywine Dabney, L.L.C., a Delaware limited liability company

Brandywine Dominion, L.L.C., a Pennsylvania limited liability company

Brandywine F.C., L.L.C., a Pennsylvania limited liability company

Brandywine Grande B, L.L.C., a Delaware limited liability company

Brandywine Grande C LLC, a Delaware limited liability company

Brandywine Greentree V, LLC, a Delaware limited liability company

Brandywine Interstate 50, L.L.C., a Delaware limited liability company

Brandywine Lake Merritt LLC, a Delaware limited liability company

Brandywine - Main Street, LLC, a Delaware limited liability company

Brandywine Metroplex LLC., a Pennsylvania limited liability company

Brandywine Midatlantic, LLC, a Delaware limited liability company

Brandywine One Logan LLC, a Pennsylvania limited liability company

Brandywine One Rodney Square, L.L.C., a Delaware limited liability company

Brandywine P.M., L.L.C., a Pennsylvania limited liability company

Brandywine Piazza, L.L.C., a New Jersey limited liability company

Brandywine Plaza Ridge I, LLC, a Delaware limited liability company

Brandywine Plaza 1000, L.L.C., a New Jersey limited liability company

Brandywine Promenade, L.L.C., a New Jersey limited liability company

Brandywine Properties II LLC, a Delaware limited liability company

Brandywine Radnor 200 Holdings LLC, a Delaware limited liability company

Brandywine Radnor Center LLC, a Pennsylvania limited liability company

Brandywine Research LLC, a Delaware limited liability company

Brandywine TB Florig, LLC, a Pennsylvania limited liability company

Brandywine TB Inn, L.L.C., a Pennsylvania limited liability company

Brandywine TB I, L.L.C., a Pennsylvania limited liability company

Brandywine TB II, L.L.C., a Pennsylvania limited liability company

Brandywine TB V, L.L.C., a Pennsylvania limited liability company

Brandywine TB VI, L.L.C., a Pennsylvania limited liability company

Brandywine TB VII, L.L.C., a Pennsylvania limited liability company

Brandywine TB VIII, L.L.C., a Pennsylvania limited liability company

Brandywine Tysons LLC, a Delaware limited liability company

Brandywine Wisconsin Avenue Financing LLC, a Delaware limited liability company

Brandywine Witmer, L.L.C., a Pennsylvania limited liability company

Brandywine 55 US Avenue LLC, a New Jersey limited liability company

Brandywine 300 Delaware, LLC, a Delaware limited liability company

Brandywine 1177 Beltline Associates GP, LLC, a Delaware limited liability company

Brandywine 2201 Co-Way LLC a Delaware limited liability company

Brandywine 2201 Co-Way II LLC, a Delaware limited liability company

BT Plymouth GP, LLC, a Delaware limited liability company

Christiana Center Operating Company I LLC, a Delaware limited liability company

Christiana Center Operating Company II LLC, a Delaware limited liability company

Christiana Center Operating Company III LLC, a Delaware limited liability company

e-Tenants LLC, a Delaware limited liability company

G&I VI 7150 Windsor MZ LLC, a Delaware limited liability company

G&I VI 7310 Tilghman MZ LLC, a Delaware limited liability company

G&I VI 7310 Tilghman FE LLC, a Delaware limited liability company

G&I VI 7248 Tilghman GP LLC, a Delaware limited liability company

G&I VI 7248 Tilghman LP LLC, a Delaware limited liability company

G&I VI 6575 Snowdrift GP LLC, a Delaware limited liability company

G&I VI 6575 Snowdrift LP LLC, a Delaware limited liability company

G&I VI 7350 Tilghman MZ LLC, a Delaware limited liability company

G&I VI 655/755 Business Center MZ LLC, a Delaware limited liability company

G&I VI 655/755 Business Center FE LLC, a Delaware limited liability company

G&I VI 1155 Business Center MZ LLC, a Delaware limited liability company

G&I VI 1155 Business Center FE LLC, a Delaware limited liability company

G&I VI 700/800 Business Center MZ LLC, a Delaware limited liability company

G&I VI 700/800 Business Center FE LLC, a Delaware limited liability company

G&I VI 630 Dresher MZ LLC, a Delaware limited liability company

G&I VI 630 Dresher FE LLC, a Delaware limited liability company

G&I VI 650 Dresher MZ LLC, a Delaware limited liability company

G&I VI 650 Dresher FE LLC, a Delaware limited liability company

G&I VI 300 Welsh 1/2 MZ LLC, a Delaware limited liability company

G&I VI 300 Welsh 1/2 FE LLC, a Delaware limited liability company

G&I VI One Greenwood MZ LLC, a Delaware limited liability company

G&I VI One Greenwood FE LLC, a Delaware limited liability company

G&I VI Two Greenwood MZ LLC, a Delaware limited liability company

G&I VI Two Greenwood FE LLC, a Delaware limited liability company

G&I VI Three Greenwood MZ LLC, a Delaware limited liability company

G&I VI Three Greenwood FE LLC, a Delaware limited liability company

G&I VI 500 Office Center MZ LLC, a Delaware limited liability company

G&I VI 500 Office Center FE LLC, a Delaware limited liability company

G&I VI 501 Office Center MZ LLC, a Delaware limited liability company

G&I VI 501 Office Center FE LLC, a Delaware limited liability company

G&I VI 321/323 Norristown MZ LLC, a Delaware limited liability company

G&I VI 321/323 Norristown FE LLC, a Delaware limited liability company

G&I VI 220 Commerce MZ LLC, a Delaware limited liability company

G&I VI 220 Commerce FE LLC, a Delaware limited liability company

G&I VI 520 Virginia MZ LLC, a Delaware limited liability company

G&I VI 520 Virginia FE LLC, a Delaware limited liability company

G&I VI Interchange Office LLC, a Delaware limited liability company

G&I VII Austin Office LLC, a Delaware limited liability company

G&I VII Barton Creek GP LLC, a Delaware limited liability company

G&I VII Barton Skyway GP LLC, a Delaware limited liability company

G&I VII Cielo GP LLC, a Delaware limited liability company

G&I VII Lantana GP LLC, a Delaware limited liability company

G&I VII Barton Creek GP LLC, a Delaware limited liability company

HSRE-Campus Crest IX, LLC, a Delaware limited liability company

New Two Logan GP, LLC, a Pennsylvania limited liability company

PP Lake Merritt, L.L.C., a Delaware limited liability company

Radnor GP, L.L.C., a Delaware limited liability company

Radnor GP-SDC, L.L.C., a Delaware limited liability company

Radnor GP-200 RC, L.L.C., a Delaware limited liability company

Radnor GP-201 KOP, L.L.C., a Delaware limited liability company

Radnor GP-555 LA, L.L.C., a Delaware limited liability company

PJP Building Two, L.C., a Virginia limited liability company

PJP Building Three, L.C., a Virginia limited liability company

PJP Building Five, L.C., a Virginia limited liability company

PJP Building Six, L.C., a Virginia limited liability company

PJP Building Seven, L.C., a Virginia limited liability company

TB-BDN Plymouth Apartments Holdings GP, LLC, a Delaware limited liability company

3 Logan LLC, a Delaware limited liability company

1919 Market Holdco General LLC, a Delaware limited liability company

2928 Walton LLC, a Delaware limited liability company

3020 Market Holding GP LLC, a Delaware limited liability company

4040 LLC, a Virginia limited liability company

1000 Chesterbrook Boulevard Partnership, a Pennsylvania general partnership

Atlantic American Properties Trust, a Maryland real estate investment trust

BDN Investment Trust, a Maryland real estate investment trust

BOI Herndon Trust, a Maryland real estate investment trust

BOI President’s Plaza Trust, a Maryland real estate investment trust

BOI Rancho Bernardo Bluffs Trust, a Maryland real estate investment trust

Brandywine Capital Trust I, a Delaware statutory trust

Brandywine Capital Trust II, a Delaware statutory trust

Broadmoor Austin Associates, a Texas joint venture

Coppel Associates, a Texas joint venture

Seven Tower Bridge Associates, a Pennsylvania limited partnership

Seven Tower Bridge Real Estate Investment Trust, a Maryland real estate investment trust

Brandywine - AI Venture LLC, a Delaware limited liability company

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-20999, 333-46647, 333-52952, 333-53359, 333-69653, 333-109010, 333-123444, 333-158590, 333-174700, and 333-174701) and on Form S-8 (Nos. 333-14243, 333-28427, 333-52957, 333-123446, 333-125311, 333-131171, 333-141906, 333-142752, 333-142754 and 333-167266) of Brandywine Realty Trust of our report dated February 25, 2014 relating to the financial statements, financial statement schedules, and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 25, 2014

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No. 333-174700-01) of Brandywine Operating Partnership, L.P. of our report dated February 25, 2014relating to the financial statements, financial statement schedules, and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 25, 2014

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES

EXCHANGE ACT OF 1934, AS AMENDED

I, Gerard H. Sweeney, certify that:

1. I have reviewed this annual report on Form 10-K of Brandywine Realty Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 25, 2014

/s/ Gerard H. Sweeney

Gerard H. Sweeney

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES

EXCHANGE ACT OF 1934, AS AMENDED

I, Howard M. Sipzner, certify that:

1. I have reviewed this annual report on Form 10-K of Brandywine Realty Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 25, 2014/s/ Howard M. Sipzner

Howard M. Sipzner

Executive Vice President and Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES

EXCHANGE ACT OF 1934, AS AMENDED

I, Gerard H. Sweeney, certify that:

1. I have reviewed this annual report on Form 10-K of Brandywine Operating Partnership, L.P.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 25, 2014

/s/ Gerard H. Sweeney

Gerard H. Sweeney

President and Chief Executive Officer

EX-31.4

Exhibit 31.4

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES

EXCHANGE ACT OF 1934, AS AMENDED

I, Howard M. Sipzner, certify that:

1. I have reviewed this annual report on Form 10-K of Brandywine Operating Partnership, L.P.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 25, 2014

/s/ Howard M. Sipzner

Howard M. Sipzner

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

RULE 13(a)-14(b) 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 Brandywine Realty Trust (the “Company”) on Form 10-K for the fiscal year ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gerard H. Sweeney, President and Chief Executive Officer of the Company, 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 result of operations of the Company.

/s/ Gerard H. Sweeney

Gerard H. Sweeney

President and Chief Executive Officer

Date: February 25, 2014

* A signed original of this written statement required by Section 906 has been provided to Brandywine Realty Trust and will be retained by Brandywine Realty Trust and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

RULE 13(a)-14(b) 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 Brandywine Realty Trust (the “Company”) on Form 10-K for the fiscal year ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Howard M. Sipzner, Executive Vice President and Chief Financial Officer of the Company, 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/ Howard M. Sipzner

Howard M. Sipzner

Executive Vice President and Chief Financial Officer

Date: February 25, 2014

* A signed original of this written statement required by Section 906 has been provided to Brandywine Realty Trust and will be retained by Brandywine Realty Trust and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.3

Exhibit 32.3

RULE 13(a)-14(b) 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 Brandywine Operating Partnership, L.P. (the “Partnership”) on Form 10-K for the fiscal year ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gerard H. Sweeney, President and Chief Executive Officer of Brandywine Realty Trust, the Partnership's sole general partner, 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/ Gerard H. Sweeney

Gerard H. Sweeney

President and Chief Executive Officer

Date: February 25, 2014

* A signed original of this written statement required by Section 906 has been provided to Brandywine Realty Trust and will be retained by Brandywine Realty Trust and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.4

Exhibit 32.4

RULE 13(a)-14(b) 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 Brandywine Operating Partnership, L.P. (the “Partnership”) on Form 10-K for the fiscal year ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Howard M. Sipzner, Executive Vice President and Chief Financial Officer of Brandywine Realty Trust, the Partnership's sole general partner, 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/ Howard M. Sipzner

Howard M. Sipzner

Executive Vice President and Chief Financial Officer

Date: February 25, 2014

* A signed original of this written statement required by Section 906 has been provided to Brandywine Realty Trust and will be retained by Brandywine Realty Trust and furnished to the Securities and Exchange Commission or its staff upon request.

EX-99.1

Exhibit 99.1

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS

The following discussion describes the material U.S. federal income tax considerations relating to the purchase, ownership and disposition of Brandywine’s common shares, preferred shares and debt securities and debt securities of Brandywine Operating Partnership, and the qualification and taxation of Brandywine Realty Trust as a REIT.

Because this is a summary that is intended to address only material U.S. federal income tax considerations relating to the ownership and disposition of Brandywine’s common shares, preferred shares or debt securities that will apply to all holders, this summary may not contain all the information that may be important to you. As you review this discussion, you should keep in mind that:

• the tax consequences to you may vary depending on your particular tax situation;

• special rules that are not discussed below may apply to you if, for example, you are a tax-exempt organization, a broker-dealer, a non-U.S. person, a trust, an estate, a regulated investment company, a REIT, a financial institution, an insurance company, a holder of debt securities or shares through a partnership or other pass-through entity, or otherwise subject to special tax treatment under the Code;

• this summary does not address state, local or non-U.S. tax considerations;

• this summary deals only with our shareholders and debt holders that hold common shares, preferred shares or debt securities as “capital assets” within the meaning of Section 1221 of the Code; and

• this discussion is not intended to be, and should not be construed as, tax advice.

You are urged both to review the following discussion and to consult with your own tax advisor to determine the effect of ownership and disposition of our common shares, preferred shares or debt securities on your individual tax situation, including any state, local or non-U.S. tax consequences.

The information in this summary is based on the Code, current, temporary and proposed Treasury regulations, the legislative history of the Code, current administrative interpretations and practices of the Internal Revenue Service, including its practices and policies as endorsed in private letter rulings, which are not binding on the Internal Revenue Service, and existing court decisions. Future legislation, regulations, administrative interpretations and court decisions could change current law or adversely affect existing interpretations of current law. Any change could apply retroactively. We have not obtained any rulings from the Internal Revenue Service concerning the tax treatment of the matters discussed in this summary. Therefore, it is possible that the Internal Revenue Service could challenge the statements in this summary, which do not bind the Internal Revenue Service or the courts, and that a court could agree with the Internal Revenue Service.

Taxation of the Company

Qualification of Brandywine as a REIT

Brandywine first elected to be taxed as a REIT for the taxable year ended December 31, 1986. A REIT generally is not subject to federal income tax on the income that it distributes to its shareholders if it meets the applicable REIT distribution requirements and other requirements for qualification.

We believe that we are organized and have operated in such a manner so as to qualify as a REIT, but there can be no assurance that we have qualified or will remain qualified as a REIT.

Qualification and taxation as a REIT depends on our ability to meet, on a continuing basis, through actual operating results, distribution levels, and diversity of stock ownership, various qualification requirements imposed upon REITs by the Code. Our ability to qualify as a REIT also requires that we satisfy certain asset tests, some of which depend upon the fair market values of assets directly or indirectly owned by us. Such values may not be susceptible to a precise determination. While we intend to continue to operate in a manner that will allow us to qualify as a REIT, no assurance can be given that the actual results of our operations for any taxable year will satisfy such requirements for qualification and taxation as a REIT.

Exhibit 99.1

Taxation of Brandywine as a REIT

If we qualify for taxation as a REIT, we generally will not be subject to federal corporate income taxes on that portion of our ordinary income or capital gain that we distribute currently to our shareholders, because the REIT provisions of the Code generally allow a REIT a deduction for distributions paid to its shareholders. This deduction substantially eliminates the “double taxation” on earnings (taxation at both the corporate level and shareholder level) that generally results from investment in a corporation. However, even if we qualify for taxation as a REIT, we will be subject to federal income tax as follows:

• We will be taxed at regular corporate rates on any undistributed REIT taxable income, including undistributed net capital gains;

• Under certain circumstances, we may be subject to the “alternative minimum tax” on our items of tax preference, if any;

• If we have net income from prohibited transactions (which are, in general, certain sales or other dispositions of property, other than foreclosure property, held primarily for sale to customers in the ordinary course of business) such income will be subject to a 100% tax. See “-Sale of Partnership Property;”

• If we elect to treat property that we acquire in connection with a foreclosure of a mortgage loan or leasehold as “foreclosure property,” we may thereby avoid the 100% tax on gain from a resale of that property (if the sale would otherwise constitute a prohibited transaction), but the income from the sale or operation of the property (and any other non-qualifying income from foreclosure property) may be subject to corporate income tax at the highest applicable rate (currently 35%);

• If we should fail to satisfy the 75% gross income test or the 95% gross income test (as discussed below), and nonetheless have maintained our qualification as a REIT because certain other requirements have been met, we will be subject to a 100% tax on the net income attributable to the greater of the amount by which we fail the 75% or 95% test, multiplied by a fraction intended to reflect our profitability;

• If we fail to satisfy any of the REIT asset tests, as described below, by larger than a de minimis amount, but our failure is due to reasonable cause and not due to willful negligence and we nonetheless maintain our REIT qualification because of specified cure provisions, we will be required to pay a tax equal to the greater of $50,000 or 35% of the net income generated by the non-qualifying assets during the period in which we failed to satisfy the asset tests;

• If we fail to satisfy any provision of the Code that would result in our failure to qualify as a REIT (other than a gross income or asset test requirement) and that violation is due to reasonable cause and not due to willful negligence, we may retain our REIT qualification, but we will be required to pay a penalty of $50,000 for each such failure;

• We may be required to pay monetary penalties to the IRS in certain circumstances, including if we fail to meet record-keeping requirements intended to monitor our compliance with rules relating to the composition of our shareholders, as described below in “Requirements for Qualification as a REIT;”

• If we should fail to distribute during each calendar year at least the sum of (a) 85% of our REIT ordinary income for such year, (b) 95% of our REIT capital gain net income for such year, and (c) any undistributed taxable income from prior years, we would be subject to a 4% excise tax on the excess of such required distribution over the sum of (i) the amounts actually distributed plus (ii) retained amounts on which corporate level tax is paid by us;

• We may elect to retain and pay income tax on our net long-term capital gain. In that case, a shareholder would include its proportionate share of our undistributed long-term capital gain in its income and would be allowed a credit for its proportionate share of the tax we paid;

• A 100% excise tax may be imposed on some items of income and expense that are directly or constructively paid between us, our tenants and/or our taxable REIT subsidiaries if and to the extent that the IRS successfully adjusts the reported amounts of these items;

• If we acquire appreciated assets from a C corporation (a corporation generally subject to corporate level tax) in a transaction in which the adjusted tax basis of the assets in our hands is determined by reference to the adjusted tax basis of the assets in the hands of the C corporation, we may be subject to tax on such appreciation at the highest corporate income tax rate then applicable if we subsequently recognize gain on a disposition of such assets during the ten-year period following their acquisition from the C corporation, unless the C corporation elects to treat the assets as if they were sold for their fair market value at the time of our acquisition; and

• Income earned by any of our taxable REIT subsidiaries will be subject to tax at regular corporate rates.

Exhibit 99.1

Requirements for Qualification as a REIT

We elected to be taxable as a REIT for U.S. federal income tax purposes for our taxable year ended December 31, 1986. In order to have so qualified, we must have met and continue to meet the requirements discussed below, relating to our organization, sources of income, nature of assets and distributions of income to shareholders.

The Code defines a REIT as a corporation, trust or association:

1.that is managed by one or more trustees or directors;

2.the beneficial ownership of which is evidenced by transferable shares or by transferable certificates of beneficial interest;

3.that would be taxable as a domestic corporation but for the special Code provisions applicable to REITs;

4.that is neither a financial institution nor an insurance company subject to certain provisions of the Code;

5.the beneficial ownership of which is held by 100 or more persons;

6.in which, during the last half of each taxable year, not more than 50% in value of the outstanding shares is owned, directly or indirectly, by five or fewer individuals (as defined in the Code to include specified entities), after applying certain attribution rules;

7.that makes an election to be taxable as a REIT, or has made this election for a previous taxable year which has not been revoked or terminated, and satisfies all relevant filing and other administrative requirements established by the Internal Revenue Service that must be met to elect and maintain REIT status;

8.that uses a calendar year for federal income tax purposes and complies with the record keeping requirements of the Code and the Treasury Regulations; and

9.that meets other applicable tests, described below, regarding the nature of its income and assets and the amount of its distributions.

Conditions (1) through (4) must be satisfied during the entire taxable year, and condition (5) must be satisfied during at least 335 days of a taxable year of 12 months, or during a proportionate part of a taxable year of less than 12 months.

We have previously issued common shares in sufficient proportions to allow us to satisfy requirements (5) and (6) (the “100 Shareholder” and “five-or-fewer” requirements). In addition, our Declaration of Trust provides restrictions regarding the transfer of our shares that are intended to assist us in continuing to satisfy the requirements described in conditions (5) and (6) above. However, these restrictions may not ensure that we will, in all cases, be able to satisfy the requirements described in conditions (5) and (6) above. In addition, we have not obtained a ruling from the Internal Revenue Service as to whether the provisions of our Declaration of Trust concerning restrictions on transfer and conversion of common shares to “Excess Shares” will allow us to satisfy conditions (5) and (6). If we fail to satisfy such share ownership requirements, our status as a REIT will terminate. However, for taxable years beginning on or after January 1, 2005, if the failure to meet the share ownership requirements is due to reasonable cause and not due to willful neglect, we may avoid termination of our REIT status by paying a penalty of $50,000.

To monitor compliance with the share ownership requirements, we are required to maintain records regarding the actual ownership of our shares. To do so, we must demand written statements each year from the record holders of certain percentages of our shares in which the record holders are to disclose the actual owners of the shares (the persons required to include in gross income the dividends paid by us). A list of those persons failing or refusing to comply with this demand must be maintained as part of our records. Failure by us to comply with these record-keeping requirements could subject us to monetary penalties. If we satisfy these requirements and have no reason to know that condition (6) is not satisfied, we will be deemed to have satisfied such condition. A shareholder that fails or refuses to comply with the demand is required by Treasury Regulations to submit a statement with its tax return disclosing the actual ownership of the shares and other information.

Qualified REIT Subsidiaries

The Code provides that a corporation that is a “qualified REIT subsidiary” shall not be treated as a separate corporation, and all assets, liabilities and items of income, deduction and credit of a “qualified REIT subsidiary” shall be treated as assets, liabilities and items of income, deduction and credit of the REIT. A “qualified REIT subsidiary” is a corporation, all of the capital stock of which is owned by the REIT, that has not elected to be a “taxable REIT subsidiary” (discussed below). In applying the requirements described herein, all of our “qualified REIT subsidiaries” will be ignored, and all assets, liabilities and items of income, deduction and credit of such subsidiaries will be treated as our assets, liabilities and items of income, deduction and credit. These subsidiaries, therefore, will not be subject to federal corporate income taxation, although they may be subject to state and local taxation.

Exhibit 99.1

Taxable REIT Subsidiaries

A REIT may generally jointly elect with a subsidiary corporation, whether or not wholly owned, to treat the subsidiary as a “taxable REIT subsidiary.” In addition, if a taxable REIT subsidiary owns, directly or indirectly, securities representing 35% or more of the vote or value of a subsidiary corporation, that subsidiary will also be treated as a taxable REIT subsidiary. A taxable REIT subsidiary is a corporation subject to U.S. federal income tax, and state and local income tax where applicable, as a regular “C” corporation.

Generally, a taxable REIT subsidiary of ours can perform some impermissible tenant services without causing us to receive impermissible tenant services income under the REIT income tests. However, several provisions regarding the arrangements between a REIT and its taxable REIT subsidiaries ensure that a taxable REIT subsidiary will be subject to an appropriate level of United States federal income taxation. For example, a taxable REIT subsidiary is limited in its ability to deduct interest payments in excess of a certain amount made to us. In addition, we will be obligated to pay a 100% penalty tax on some payments that we receive or on certain expenses deducted by the taxable REIT subsidiary if the economic arrangements among us, our tenants, and/or the taxable REIT subsidiary are not comparable to similar arrangements among unrelated parties. A taxable REIT subsidiary may also engage in other activities that, if conducted by us other than through a taxable REIT subsidiary, could result in the receipt of non-qualified income or the ownership of non-qualified assets.

Ownership of Partnership Interests by a REIT

A REIT that is a partner in a partnership is deemed to own its proportionate share of the assets of the partnership and is deemed to receive the income of the partnership attributable to such share. In addition, the character of the assets and gross income of the partnership retains the same character in the hands of the REIT. Accordingly, our proportionate share of the assets, liabilities and items of income of the Operating Partnership are treated as assets, liabilities and items of income of ours for purposes of applying the requirements described herein. Brandywine has control over the Operating Partnership and most of the partnership and limited liability company subsidiaries of the Operating Partnership and intends to operate them in a manner that is consistent with the requirements for qualification of Brandywine as a REIT.

Income Tests

In order to qualify as a REIT, Brandywine must generally satisfy two gross income requirements on an annual basis. First, at least 75% of our gross income (excluding gross income from prohibited transactions) for each taxable year must be derived directly or indirectly from investments relating to real property or mortgages on real property, including “rents from real property,” dividends received from other REITs, interest income derived from mortgage loans secured by real property (including certain types of mortgage-backed securities), and gains from the sale of real estate assets, as well as income from certain kinds of temporary investments. Second, at least 95% of our gross income (excluding gross income from prohibited transactions) for each taxable year must be derived from the same items which qualify under the 75% gross income test, and from dividends, interest and gain from the sale or disposition of securities, which need not have any relation to real property.

Rents received by a REIT will qualify as “rents from real property” in satisfying the gross income requirements described above only if several conditions are met.

• The amount of rent must not be based in whole or in part on the income or profits of any person. However, an amount received or accrued generally will not be excluded from the term “rents from real property” solely by reason of being based on a fixed percentage or percentages of gross receipts or sales.

• Rents received from a tenant will not qualify as “rents from real property” in satisfying the gross income tests if the REIT, or a direct or indirect owner of 10% or more of the REIT, directly or constructively, owns 10% or more of such tenant (a “Related Party Tenant”). However, rental payments from a taxable REIT subsidiary will qualify as rents from real property even if we own more than 10% of the total value or combined voting power of the taxable REIT subsidiary if at least 90% of the property is leased to unrelated tenants and the rent paid by the taxable REIT subsidiary is substantially comparable to the rent paid by the unrelated tenants for comparable space.

• Rent attributable to personal property leased in connection with a lease of real property will not qualify as “rents from real property” if such rent exceeds 15% of the total rent received under the lease.

• the REIT generally must not operate or manage the property or furnish or render services to tenants, except through an “independent contractor” who is adequately compensated and from whom the REIT derives no income, or through a taxable REIT subsidiary. The “independent contractor”

Exhibit 99.1

requirement, however, does not apply to the extent the services provided by the REIT are “usually or customarily rendered” in connection with the rental of space for occupancy only, and are not otherwise considered “rendered to the occupant.” In addition, a de minimis rule applies with respect to non-customary services. Specifically, if the value of the non-customary service income with respect to a property (valued at no less than 150% of the direct costs of performing such services) is 1% or less of the total income derived from the property, then all rental income except the non-customary service income will qualify as “rents from real property.” A taxable REIT subsidiary may provide services (including non-customary services) to a REIT’s tenants without “tainting” any of the rental income received by the REIT, and will be able to manage or operate properties for third parties and generally engage in other activities unrelated to real estate.

We do not anticipate receiving rent that is based in whole or in part on the income or profits of any person (except by reason of being based on a fixed percentage or percentages of gross receipts or sales consistent with the rules described above). We also do not anticipate receiving more than a de minimis amount of rents from any Related Party Tenant or rents attributable to personal property leased in connection with real property that will exceed 15% of the total rents received with respect to such real property.

We provide services to our properties that we own through the Operating Partnership, and we believe that all of such services will be considered “usually or customarily rendered” in connection with the rental of space for occupancy only so that the provision of such services will not jeopardize the qualification of rent from the properties as “rents from real property.” In the case of any services that are not “usual and customary” under the foregoing rules, we intend to employ an “independent contractor” or a taxable REIT subsidiary to provide such services.

The Operating Partnership may receive certain types of income that will not qualify under the 75% or 95% gross income tests. In particular, dividends received from a taxable REIT subsidiary will not qualify under the 75% test. We believe, however, that the aggregate amount of such items and other non-qualifying income in any taxable year will not cause Brandywine to exceed the limits on non-qualifying income under either the 75% or 95% gross income tests.

If Brandywine fails to satisfy one or both of the 75% or 95% gross income tests for any taxable year, Brandywine may nevertheless qualify as a REIT for such year if it is entitled to relief under certain provisions of the Code. These relief provisions will be generally available if (1) the failure to meet such tests was due to reasonable cause and not due to willful neglect, (2) we have attached a schedule of the sources of our income to our return, and (3) any incorrect information on the schedule was not due to fraud with intent to evade tax. In addition, for taxable years beginning on or after January 1, 2005, we must also file a disclosure schedule with the IRS after we determine that we have not satisfied one of the gross income tests. It is not possible, however, to state whether in all circumstances Brandywine would be entitled to the benefit of these relief provisions. As discussed above in “Taxation of Brandywine as a REIT,” even if these relief provisions apply, a tax would be imposed based on the non-qualifying income.

Asset Tests

At the close of each quarter of each taxable year, Brandywine must satisfy the following four tests relating to the nature of our assets:

First, at least 75% of the value of our total assets must be represented by some combination of “real estate assets,” cash or cash items, U.S. government securities, and, under some circumstances, stock or debt instruments purchased with new capital. For this purpose, “real estate assets” include interests in real property, such as land, buildings, leasehold interests in real property, stock of other REITs, and certain kinds of mortgage-backed securities and mortgage loans. Assets that do not qualify for purposes of the 75% test are subject to the additional asset tests described below, while securities that do qualify for purposes of the 75% test are generally not subject to the additional asset tests.

Second, the value of any one issuer’s securities we own may not exceed 5% of the value of our total assets.

Third, we may not own more than 10% of the vote or value of any one issuer’s outstanding securities. The 5% and 10% tests do not apply to our interests in the Operating Partnership, non-corporate subsidiaries, taxable REIT subsidiaries and any qualified REIT subsidiaries, and the 10% value test does not apply with respect to certain “straight debt” securities.

Effective for taxable years beginning after December 31, 2000, the safe harbor under which certain types of securities are disregarded for purposes of the 10% value limitation includes (1) straight debt securities (including straight debt securities that provides for certain contingent payments); (2) any loan to an individual or an estate; (3) any rental agreement described in

Exhibit 99.1

Section 467 of the Code, other than with a “related person”; (4) any obligation to pay rents from real property; (5) certain securities issued by a State or any political subdivision thereof, or the Commonwealth of Puerto Rico; (6) any security issued by a REIT; and (7) any other arrangement that, as determined by the Secretary of the Treasury, is excepted from the definition of a security. In addition, for purposes of applying the 10% value limitation, (a) a REIT’s interest as a partner in a partnership is not considered a security; (b) any debt instrument issued by a partnership is not treated as a security if at least 75% of the partnership’s gross income is from sources that would qualify for the 75% REIT gross income test, and (c) any debt instrument issued by a partnership is not treated as a security to the extent of the REIT’s interest as a partner in the partnership.

Fourth, not more than 25% (20% for taxable years ending on or before December 31, 2008) of the value of our assets may be represented by securities of one or more taxable REIT subsidiaries.

We may own, directly or indirectly, common shares of certain entities that have elected or will elect to be treated as a real estate investment trusts (“Captive REITs”). Provided that each of the Captive REITs continues to qualify as a REIT (including satisfaction of the ownership, income, asset and distribution tests discussed herein) the common shares of the Captive REITs will qualify as real estate assets under the 75% test. However, if any Captive REIT fails to qualify as a REIT in any year, then the common shares of such Captive REIT will not qualify as real estate assets under the 75% test. In addition, if we own, directly or indirectly, more than 10% of the common shares of each Captive REIT, Brandywine would not satisfy the 10% test if any Captive REIT were to fail to qualify as a REIT. Accordingly, Brandywine’s qualification as a REIT depends upon the ability of any more than 10% owned Captive REIT to continue to qualify as a REIT.

After initially meeting the asset tests at the close of any quarter, Brandywine will not lose its status as a REIT for failure to satisfy the asset tests at the end of a later quarter solely by reason of changes in asset values. If the failure to satisfy the asset tests results from an acquisition of securities or other property during a quarter, the failure can be cured by disposition of sufficient non-qualifying assets within 30 days after the close of that quarter. We intend to maintain adequate records of the value of our assets to ensure compliance with the asset tests, and to take such other action within 30 days after the close of any quarter as may be required to cure any noncompliance. However, there can be no assurance that such other action will always be successful. If we fail to cure any noncompliance with the asset tests within such time period, our status as a REIT would be lost.

For taxable years beginning on or after January 1, 2005, the Code provides relief from certain failures to satisfy the REIT asset tests. If the failure relates to the 5% test or 10% test, and if the failure is de minimis (does not exceed the lesser of $10 million or 1% of our assets as of the end of the quarter), we may avoid the loss of our REIT status by disposing of sufficient assets to cure the failure within 6 months after the end of the quarter in which the failure was identified. For failures to meet the asset tests that are more than a de minimis amount, we may avoid the loss of our REIT status if: the failure was due to reasonable cause, we file a disclosure schedule at the end of the quarter in which the failure was identified, we dispose of sufficient assets to cure the failure within 6 months after the end of the quarter, and we pay a tax equal to the greater of $50,000 or the highest corporate tax rate multiplied by the net income generated by the non-qualifying assets.

Annual Distribution Requirements

In order to qualify as a REIT, Brandywine is required to distribute dividends (other than capital gain dividends) to our shareholders in an amount at least equal to (1) the sum of (a) 90% of its “REIT taxable income” (computed without regard to the dividends paid deduction and the REIT’s net capital gain or loss) and (b) 90% of the net income (after tax), if any, from foreclosure property, minus (2) certain “excess” non-cash income as defined in the Code. These distributions must be paid in the taxable year to which they relate, or in the following taxable year if such distributions are declared in October, November or December of the taxable year, are payable to shareholders of record on a specified date in any such month, and are actually paid before the end of January of the following year. Such distributions are treated as both paid by us and received by our shareholders on December 31 of the year in which they are declared.

In addition, at our election, a distribution for a taxable year may be declared before we timely file our tax return for the year provided we pay such distribution with or before our first regular dividend payment after such declaration, and such payment is made during the 12-month period following the close of such taxable year. Such distributions are taxable to our shareholders in the year in which paid, even though the distributions relate to our prior taxable year for purposes of the 90% distribution requirement.

In order for distributions to be counted towards our distribution requirement, and to provide a tax deduction to us, they must not be “preferential dividends.” A dividend is not a preferential dividend if it is pro rata among all outstanding shares within a particular class and is in accordance with the preferences among our different classes of shares as set forth in our organizational documents.

Exhibit 99.1

To the extent that we distribute at least 90%, but less than 100%, of our net taxable income, we will be subject to tax at ordinary corporate tax rates on the retained portion. In addition, we may elect to retain, rather than distribute our net long-term capital gains and pay tax on such gains. In this case, we would elect to have our shareholders include their proportionate share of such undistributed long-term capital gains in their income and receive a corresponding credit for their proportionate share of the tax paid by us. Our shareholders would then increase their adjusted basis in our shares by the difference between the amount included in their long-term capital gains and the tax deemed paid with respect to their shares.

If we should fail to distribute during each calendar year (or, in the case of distributions with declaration and record dates falling in the last three months of the calendar year, by the end of January following such calendar year) at least the sum of (1) 85% of our REIT ordinary income for such year, (2) 95% of our REIT net capital gain income for such year and (3) any undistributed taxable income from prior periods, we would be subject to a 4% excise tax on the excess of such required distribution over the sum of (a) the amounts actually distributed plus (b) retained amounts on which corporate level tax is paid by us.

Brandywine intends to make timely distributions sufficient to satisfy the annual distribution requirements. In this regard, the limited partnership agreement of the Operating Partnership authorizes Brandywine, as general partner, to operate the partnership in a manner that will enable it to satisfy the REIT requirements and avoid the imposition of any federal income or excise tax liability. It is possible that we, from time to time, may not have sufficient cash or other liquid assets to meet the 90% distribution requirement. This could arise, for example, when there is an expenditure of cash for nondeductible items such as principal amortization or capital expenditures. In addition, because we may deduct capital losses only to the extent of our capital gains, our REIT taxable income may exceed our economic income. In order to meet the 90% distribution requirement, we may borrow or may cause the Operating Partnership to arrange for short-term or possibly long-term borrowing to permit the payment of required distributions, or we may pay dividends in the form of taxable in-kind distributions of property, including potentially, our shares.

Under certain circumstances, Brandywine may be able to rectify a failure to meet the distribution requirement for a given year by paying “deficiency dividends” to shareholders in a later year that may be included in Brandywine’s deduction for distributions paid for the earlier year. Thus, Brandywine may be able to avoid losing our REIT qualification or being taxed on amounts distributed as deficiency dividends. However, Brandywine will be required to pay to the Internal Revenue Service interest and a penalty based upon the amount of any deduction taken for deficiency dividends.

Failure to Qualify

For taxable years beginning on or after January 1, 2005, the Code provides relief for many failures to satisfy the REIT requirements. In addition to the relief provisions for failures to satisfy the income and asset tests (discussed above), the Code provides additional relief for other failures to satisfy REIT requirements. If the failure is due to reasonable cause and not due to willful neglect, and we elect to pay a penalty of $50,000 for each failure, we can avoid the loss of our REIT status.

If Brandywine fails to qualify for taxation as a REIT in any taxable year and the relief provisions do not apply, it will be subject to tax (including any applicable corporate alternative minimum tax) on its taxable income at regular corporate rates. Distributions to shareholders in any year in which Brandywine fails to qualify will not be deductible to us. In such event, to the extent of Brandywine’s current and accumulated earnings and profits, all distributions to shareholders will be taxable to them as dividends, and, subject to certain limitations of the Code, corporate distributees may be eligible for the dividends received deduction. Under current law, such dividends will generally be taxable to individual shareholders at the 20% rate for qualified dividends provided that applicable holding period requirements are met. Unless entitled to relief under specific statutory provisions, Brandywine also will be disqualified from taxation as a REIT for the four taxable years following the year during which qualification was lost. It is not possible to state whether in all circumstances Brandywine would be entitled to such statutory relief.

Prohibited Transactions

Net income derived from a prohibited transaction is subject to a 100% tax. The term “prohibited transaction” generally includes a sale or other disposition of property (other than foreclosure property) that is held primarily for sale to customers in the ordinary course of a trade or business. Under existing law, whether property is held as inventory or primarily for sale to customers in the ordinary course of a trade or business is a question of fact that depends on all the facts and circumstances of a particular transaction. We intend to hold properties for investment with a view to long-term appreciation, to engage in the business of acquiring, developing, owning and operating properties, and to make occasional sales of properties as are consistent with our investment objectives. No assurance can be given that any property that we sell will not be treated as property held for sale to customers, or that we can comply with certain safe-harbor provisions of the Code that would prevent

Exhibit 99.1

the imposition of the 100% tax. The 100% tax does not apply to gains from the sale of property that is held through a taxable REIT subsidiary or other taxable corporation, although such income will be subject to tax in the hands of that corporation at regular corporate tax rates.

Foreclosure Property

Foreclosure property is real property (including interests in real property) and any personal property incident to such real property (1) that is acquired by a REIT as a result of the REIT having bid on the property at foreclosure, or having otherwise reduced the property to ownership or possession by agreement or process of law, after there was a default (or default was imminent) on a lease of the property or a mortgage loan held by the REIT and secured by the property, (2) for which the related loan or lease was made, entered into or acquired by the REIT at a time when default was not imminent or anticipated and (3) for which such REIT makes an election to treat the property as foreclosure property. REITs generally are subject to tax at the maximum corporate rate (currently 35%) on any net income from foreclosure property, including any gain from the disposition of the foreclosure property, other than income that would otherwise be qualifying income for purposes of the 75% gross income test. Any gain from the sale of property for which a foreclosure property election has been made will not be subject to the 100% tax on gains from prohibited transactions described above, even if the property is held primarily for sale to customers in the ordinary course of a trade or business.

Hedging

We may enter into hedging transactions with respect to one or more of our assets or liabilities. Hedging transactions could take a variety of forms, including interest rate swaps or cap agreements, options, futures contracts, forward rate agreements or similar financial instruments. Except to the extent provided by Treasury Regulations, any income from a hedging transaction (i) made in the normal course of our business primarily to manage risk of interest rate or price changes or currency fluctuations with respect to borrowings made or to be made, or ordinary obligations incurred or to be incurred by us to acquire or own real estate assets or (ii) entered into after July 30, 2008 primarily to manage the risk of currency fluctuations with respect to any item of income or gain that would be qualifying income under the 75% or 95% income tests (or any property which generates such income or gain), which is clearly identified as such before the close of the day on which it was acquired, originated or entered into, including gain from the disposition of such a transaction, will not constitute gross income for purposes of the 95% gross income test and, in respect of hedges entered into after July 30, 2008, the 75% gross income test. To the extent we enter into other types of hedging transactions, the income from those transactions is likely to be treated as non-qualifying income for purposes of both the 75% and 95% gross income tests. We intend to structure any hedging transactions in a manner that does not jeopardize our ability to qualify as a REIT.

Tax Aspect of Investments in the Operating Partnership and Subsidiary Partnerships

The following discussion summarizes certain Federal income tax considerations applicable to Brandywine’s investment in the Operating Partnership and the Operating Partnership’s investments in subsidiary partnerships, limited liability companies, and joint ventures (referred to collectively as the “Subsidiary Partnerships”).

General

We may hold investments through entities that are classified as partnerships for U.S. federal income tax purposes, including our interest in the Operating Partnership and the equity interests in Subsidiary Partnerships. In general, partnerships are “pass-through” entities that are not subject to U.S. federal income tax. Rather, partners are allocated their proportionate shares of the items of income, gain, loss, deduction and credit of a partnership, and are subject to tax on these items without regard to whether the partners receive a distribution from the partnership. We will include in our income our proportionate share of these partnership items for purposes of the various REIT income tests and in the computation of our REIT taxable income. Moreover, for purposes of the REIT asset tests, we will include our proportionate share of assets held by subsidiary partnerships. Consequently, to the extent that we hold an equity interest in a partnership, the partnership’s assets and operations may affect our ability to qualify as a REIT.

Classification of the Operating Partnership and Subsidiary Partnerships as Partnerships

The investment by us in partnerships involves special tax considerations, including the possibility of a challenge by the Internal Revenue Service to the status of the Operating Partnership or any if our Subsidiary Partnerships as a partnership, as opposed to an association taxable as a corporation, for U.S. federal income tax purposes. If any of these entities were treated as an association for U.S. federal income tax purposes, it would be taxable as a corporation and, therefore, could be subject to an entity-level tax on its income. In such a situation, the character of our assets and items of our gross income would change and

Exhibit 99.1

could preclude us from satisfying the REIT asset tests or the REIT income tests as discussed in “-- Taxation of the Company -- Asset Tests” and “-- Income Tests” above, and in turn could prevent us from qualifying as a REIT. See “-- Taxation of the Company -- Failure to Qualify,” above, for a discussion of the effect of our failure to meet these tests for a taxable year. In addition, any change in the status of any of our subsidiary partnerships for tax purposes might be treated as a taxable event, in which case we could have taxable income that is subject to the REIT distribution requirements without receiving any cash.

Treasury Regulations that apply for tax periods beginning on or after January 1, 1997 provide that a domestic business entity not otherwise organized as a corporation (an “Eligible Entity”) may elect to be treated as a partnership or disregarded entity for federal income tax purposes. Unless it elects otherwise, an Eligible Entity in existence prior to January 1, 1997, will have the same classification for federal income tax purposes that it claimed under the entity classification Treasury Regulations in effect prior to this date. In addition, an Eligible Entity that did not exist or did not claim a classification prior to January 1, 1997 will be classified as a partnership or disregarded entity for federal income tax purposes unless it elects otherwise. The Operating Partnership and the Subsidiary Partnerships (other than those Subsidiary Partnerships that have elected to be treated as taxable REIT subsidiaries) intend to claim classification as partnerships or disregarded entities under these Treasury Regulations. As a result, we believe that the Operating Partnership and such Subsidiary Partnerships (other than those Subsidiary Partnerships that have elected to be treated as taxable REIT subsidiaries) will be classified as partnerships or disregarded entities for federal income tax purposes. We have not requested and do not intend to request a ruling from the Internal Revenue Service that the Operating Partnership or Subsidiary Partnerships will be classified as partnerships for federal income tax purposes.

Partnership Allocations

Although a partnership agreement will generally determine the allocation of income and losses among partners, such allocations will be disregarded for tax purposes if they do not comply with the provisions of Section 704(b) of the Code and the Treasury Regulations promulgated thereunder, which require that partnership allocations respect the economic arrangement of the partners. If an allocation is not recognized for Federal income tax purposes, the item subject to the allocation will be reallocated in accordance with the partners’ interests in the partnership, which will be determined by taking into account all of the facts and circumstances relating to the economic arrangement of the partners with respect to such item. The Operating Partnership’s allocations of taxable income and loss are intended to comply with the requirements of Section 704(b) of the Code and the Treasury Regulations promulgated thereunder.

Tax Allocations With Respect to Contributed Properties

Pursuant to Section 704(c) of the Code, items of income, gain, loss and deduction attributable to appreciated or depreciated property that is contributed to a partnership in exchange for an interest in the partnership must be allocated for federal income tax purposes in a manner such that the contributor is charged with or benefits from the unrealized gain or unrealized loss associated with the property at the time of the contribution. The amount of such unrealized gain or unrealized loss is generally equal to the difference between the fair market value of the contributed property at the time of contribution and the adjusted tax basis of such property at the time of contribution. Such allocations are solely for federal income tax purposes and do not affect other economic or legal arrangements among the partners.

Our Operating Partnership has entered into transactions involving the contribution to the Operating Partnership of appreciated property, and the Operating Partnership may enter into such transactions in the future. The partnership agreement of the Operating Partnership requires allocations of income, gain, loss and deduction attributable to contributed property to be made in a manner that is consistent with Section 704(c) of the Code. Treasury Regulations issued under Section 704(c) give partnerships a choice of several methods of allocating taxable income with respect to contributed properties. Depending upon the method chosen, (1) our tax depreciation deductions attributable to those properties may be lower than they would have been if our Operating Partnership had acquired those properties for cash and (2) in the event of a sale of such properties, we could be allocated gain in excess of our corresponding economic or book gain. These allocations may cause us to recognize taxable income in excess of cash proceeds received by us, which might adversely affect our ability to comply with the REIT distribution requirements or result in our shareholders recognizing additional dividend income without an increase in distributions.

Depreciation

The Operating Partnership’s assets include a substantial amount of appreciated property contributed by its partners. Assets contributed to a partnership in a tax-free transaction generally retain the same depreciation method and recovery period as they had in the hands of the partner who contributed them to the partnership. Accordingly, a substantial amount of the Operating Partnership’s depreciation deductions for its real property are based on the historic tax depreciation schedules for the

Exhibit 99.1

properties prior to their contribution to the Operating Partnership. The properties are being depreciated over a range of 15 to 40 years using various methods of depreciation which were determined at the time that each item of depreciable property was placed in service. Any depreciable real property purchased by the Partnerships is currently depreciated over 40 years. In certain instances where a partnership interest rather than real property is contributed to the Partnership, the real property may not carry over its recovery period but rather may, similarly, be subject to the lengthier recovery period.

Basis in Operating Partnership Interest

Our adjusted tax basis in each of the partnerships in which we have an interest generally (1) will be equal to the amount of cash and the basis of any other property contributed to such partnership by us, (2) will be increased by (a) our allocable share of such partnership’s income and (b) our allocable share of any indebtedness of such partnership, and (3) will be reduced, but not below zero, by our allocable share of (a) such partnership’s loss and (b) the amount of cash and the tax basis of any property distributed to us and by constructive distributions resulting from a reduction in our share of indebtedness of such partnership.

If our allocable share of the loss (or portion thereof) of any partnership in which we have an interest would reduce the adjusted tax basis of our partnership interest in such partnership below zero, the recognition of such loss will be deferred until such time as the recognition of such loss (or portion thereof) would not reduce our adjusted tax basis below zero. To the extent that distributions to us from a partnership, or any decrease in our share of the nonrecourse indebtedness of a partnership (each such decrease being considered a constructive cash distribution to the partners), would reduce our adjusted tax basis below zero, such distributions (including such constructive distributions) would constitute taxable income to us. Such distributions and constructive distributions normally would be characterized as long-term capital gain if our interest in such partnership has been held for longer than the long-term capital gain holding period (currently 12 months).

Sale of Partnership Property

Generally, any gain realized by a partnership on the sale of property held by the partnership for more than 12 months will be long-term capital gain, except for any portion of such gain that is treated as depreciation or cost recovery recapture. However, under requirements applicable to REITs under the Code, our share as a partner of any gain realized by the Operating Partnership on the sale of any property held as inventory or other property held primarily for sale to customers in the ordinary course of a trade or business will be treated as income from a prohibited transaction that is subject to a 100% penalty tax. See “-Taxation of the Company - Prohibited Transactions.”

Taxation of Shareholders

As used herein, a “U.S. Shareholder” means a beneficial owner of our common shares or preferred shares, who is, for U.S. federal income tax purposes:

• a citizen or resident of the U.S. as defined in section 7701(b) of the Code,

• a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the U.S. or any state thereof or the District of Columbia,

• an estate the income of which is subject to U.S. federal income taxation regardless of its source or

• a trust if it (a) is subject to the primary supervision of a court within the U.S. and one or more U.S. persons have the authority to control all substantial decisions of the trust or (b) has a valid election in effect under applicable U.S. Treasury regulations to be treated as a U.S. person.

As used herein, a “non-U.S. Shareholder” means a beneficial owner of our common shares or preferred shares that is not a “U.S. Shareholder” and that is not a partnership (or other entity treated as a partnership for U.S. federal income tax purposes).

If a partnership holds common shares or preferred shares, the tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding common shares or preferred shares, you should consult your tax advisors.

Exhibit 99.1

Taxation of Taxable U.S. Shareholders

Taxation of Ordinary Dividends on Shares

As long as Brandywine qualifies as a REIT, distributions made to Brandywine’s taxable U.S. Shareholders out of current or accumulated earnings and profits (and not designated as capital gain dividends) (“Ordinary Dividends”) will be dividends taxable to such U.S. Shareholders as ordinary income and will not be eligible for the dividends received deduction for corporations. Dividends received from REITs are generally not eligible for taxation at the preferential rates for qualified dividends received by individual shareholders. We may designate a distribution as qualified dividend income to the extent of (1) qualified dividend income we receive during the current year (for example, dividends received from our taxable REIT subsidiaries), plus (2) income on which we have been subject to corporate level tax during the prior year (for example, undistributed REIT taxable income), plus (3) any income attributable to the sale of a built in gain asset that was acquired from a C corporation in a carry-over basis transaction less the tax paid on that income. To the extent that we designate a dividend as qualified dividend income, an individual will be taxable at preferential rates (20% maximum federal rate) on such qualified dividend income provided certain holding period requirements are met. However, we expect that ordinary dividends paid by Brandywine generally will not be eligible for treatment as qualified dividend income to any significant extent.

Capital Gain Distributions

Distributions that are designated as long-term capital gain dividends will be taxed as long-term capital gains (to the extent they do not exceed our actual net capital gain for the taxable year) without regard to the period for which the U.S. Shareholder has held its shares of beneficial interest. In general, U.S. Shareholders will be taxable on long term capital gains at a maximum rate of 20%, except that the portion of such gain that is attributable to depreciation recapture will be taxable at the maximum rate of 25%. However, corporate shareholders may be required to treat up to 20% of certain capital gain dividends as ordinary income.

We may elect under the applicable provisions of the Code to retain and pay tax on our net capital gains. In such event U.S. Shareholders will be taxable on their proportionate share of such undistributed capital gains. Each U.S. Shareholder would then receive a credit, for use on their return, in the amount of their proportionate share of the capital gains tax paid by us. If the credit results in an amount owed to a U.S. Shareholder, such U.S. Shareholder would receive a refund. A U.S. Shareholder’s basis in our shares will be increased by the amount of the shareholder’s allocable share of any retained capital gains less the shareholder’s allocable share of the tax paid by us on such capital gains.

Non-Dividend Distributions

Distributions in excess of current and accumulated earnings and profits (“Non-Dividend Distributions”) will not be taxable to a U.S. Shareholder to the extent that they do not exceed the adjusted basis of the shareholder’s shares, but rather will reduce the adjusted basis of such shares. To the extent that Non-Dividend Distributions exceed the adjusted basis of a U.S. Shareholder’s shares, such distributions will be included in income as long-term capital gain (or short-term capital gain if the shares have been held for 12 months or less) assuming the shares are a capital asset in the hands of the shareholder. In determining the extent to which a distribution on our shares constitutes a dividend for tax purposes, the earnings and profits of Brandywine will be allocated first to distributions with respect to the preferred shares and second to distributions with respect to common shares. Therefore, depending on our earnings and profits, distributions with respect to the preferred shares (as compared to distributions with respect to our common shares) are more likely to be treated as dividends than as a return of capital or a distribution in excess of basis.

Dividends Paid in Common Shares

A recent Internal Revenue Service revenue procedure allows us to satisfy the REIT distribution requirements with respect to certain taxable years by distributing up to 90% of our dividends in the form of common shares rather than cash. In the event that we pay a portion of a dividend in common shares, taxable U.S. Shareholders would be required to pay tax on the full amount of the dividend (including the fair market value of any common shares received) and the amount of the tax may exceed the amount of cash received.

Exhibit 99.1

Timing of Distributions

Any distribution declared by us in October, November or December of any year payable to a shareholder of record on a specified date in any such month shall be treated as both paid by Brandywine and received by the shareholder on December 31 of such year, provided that the distribution is actually paid by Brandywine not later than the end of January of the following calendar year. Shareholders may not include in their individual income tax returns any of Brandywine’s losses.

Sale or Exchange of Common and Preferred Shares

In general, a U.S. Shareholder will recognize capital gain or loss on the disposition of common or preferred shares equal to the difference between the sales price for such shares and the adjusted tax basis for such shares. In general, a U.S. Shareholder’s adjusted tax basis will equal the U.S. Shareholder’s acquisition cost, increased by the U.S. Shareholder’s allocable share of any retained capital gains, less the U.S. Shareholder’s allocable share of the tax paid by us on such retained capital gains, and reduced by Non-Dividend Distributions.

In general, capital gains recognized by individuals and other non-corporate U.S. Shareholders upon the sale or disposition of shares of our shares will be subject to a maximum U.S. federal income tax rate of 20%, if our shares are held for more than 12 months, and will be taxed at ordinary income rates (of up to 39.6% ) if our shares are held for 12 months or less. Gains recognized by U.S. Shareholders that are corporations are subject to U.S. federal income tax at a maximum rate of 35%, whether or not classified as long-term capital gains.

Capital losses recognized by a U.S. Shareholder upon the disposition of our shares held for more than one year at the time of disposition will be considered long-term capital losses, and are generally available only to offset capital gain income of the U.S. Shareholder but not ordinary income (except in the case of individuals, who may offset up to $3,000 of ordinary income each year). However, any loss upon a sale or exchange of shares by a U.S. Shareholder who has held such shares for six months or less (after applying certain holding period rules) will be treated as a long-term capital loss to the extent such shareholder has received distributions from us required to be treated as long-term capital gain.

If a U.S. Shareholder recognizes a loss upon a subsequent disposition of our shares in an amount that exceeds a prescribed threshold, it is possible that the provisions of Treasury Regulations involving “reportable transactions” could apply, with a resulting requirement to separately disclose the loss generating transactions to the IRS. While these regulations are directed towards “tax shelters,” they are written broadly, and apply to transactions that would not typically be considered tax shelters. Significant penalties apply for failure to comply with these requirements. You should consult your tax advisors concerning any possible disclosure obligation with respect to the receipt or disposition of our shares, or transactions that might be undertaken directly or indirectly by us. Moreover, you should be aware that we and other participants in transactions involving us (including our advisors) might be subject to disclosure or other requirements pursuant to these regulations.

Passive Activity Losses and Investment Interest Limitations

Distributions from us and gain from the disposition of shares will not be treated as passive activity income and, therefore, U.S. Shareholders will not be able to apply any “passive losses” against such income. Distributions from us (to the extent they do not constitute a return of capital or capital gain dividends) will generally be treated as investment income for purposes of the investment income limitation. A shareholder may elect to treat capital gain dividends and capital gains from the disposition of shares as investment income for purposes of the investment income limitation, but in such event a shareholder will be taxed at ordinary income rates on such amounts.

Redemption of Preferred Shares

Our preferred shares are redeemable by us under certain circumstances. A redemption of preferred shares will be treated under Section 302 of the Internal Revenue Code as a distribution taxable as a dividend (to the extent of our current and accumulated earnings and profits) at ordinary income rates, unless the redemption satisfies one of the tests set forth in Section 302(b) of the Internal Revenue Code and is therefore treated as a sale or exchange of the redeemed shares. The redemption will be treated as a sale or exchange if it (i) is “substantially disproportionate” with respect to the holder, (ii) results in a “complete termination” of the holder’s share interest in our company, or (iii) is “not essentially equivalent to a dividend with respect to the holder, all within the meaning of Section 302(b) of the Internal Revenue Code.

In determining whether any of these tests has been met, there must be taken into account not only any preferred shares owned by the holder, but also such holder’s ownership of our common shares, other series of preferred shares and any options to acquire any of the foregoing. The holder also must take into account any such securities (including options) which are

Exhibit 99.1

considered to be owned by such holder by reason of the constructive ownership rules set forth in Sections 318 and 302(c) of the Internal Revenue Code. If a particular holder owns (actually or constructively) no common shares or an insubstantial percentage of common shares or preferred shares, based upon current law, it is probable that the redemption of the preferred shares from such holder would be considered “not essentially equivalent to a dividend.” However, because the determination as to whether any of the alternative tests of Section 302(b) of the Internal Revenue Code will be satisfied with respect to any particular holder of preferred shares depends upon the facts and circumstances at the time the determination must be made, prospective holders of preferred shares are advised to consult their own tax advisors to determine such tax treatment.

If a redemption of preferred shares is not treated as a distribution taxable as a dividend to a particular holder, it will be treated as a taxable sale or exchange by that holder. As a result, the holder will recognize gain or loss for federal income tax purposes in an amount equal to the difference between (i) the amount of cash and the fair market value of any property received (less any portion thereof attributable to accumulated and declared but unpaid dividends, which will be taxable as a dividend to the extent of our current and accumulated earnings and profits) and (ii) the holder’s adjusted tax basis in the shares. Such gain or loss will be capital gain or loss if the shares were held as a capital asset, and will be long-term gain or loss if such shares were held for more than one year.

If the redemption is treated as a distribution taxable as a dividend, the amount of the distribution will be measured by the amount of cash and the fair market value of any property received by the holder. The holder’s adjusted tax basis in the preferred shares redeemed will be transferred to any other shareholdings of the holder in Brandywine. If the holder of the preferred shares owns no other shares, under certain circumstances, such basis may be transferred to a related person, or it may be lost entirely.

Information Reporting and Backup Withholding Applicable to U.S. Shareholders

In general, Brandywine will report to its U.S. Shareholders and the Internal Revenue Service the amount of distributions paid (unless the U.S. Shareholder is an exempt recipient) during each calendar year, and the amount of tax withheld, if any. Under the backup withholding rules, a shareholder may be subject to backup withholding at the rate of 28% with respect to distributions paid unless such shareholder (a) comes within certain exempt categories and, when required, demonstrates this fact, or (b) provides a taxpayer identification number, certifies as to no loss of exemption from backup withholding and otherwise complies with applicable requirements of the backup withholding rules. A shareholder that does not provide us with his correct taxpayer identification number may also be subject to penalties imposed by the Internal Revenue Service. In addition, we may be required to withhold a portion of capital gain distributions to any shareholders who fail to certify their non-foreign status to Brandywine. See “-Taxation of non-U.S. Shareholders.” Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against the shareholder’s income tax liability, provided the required information is furnished to the Internal Revenue Service.

Taxation of Tax-Exempt Shareholders

U.S. tax-exempt entities, including qualified employee pension and profit sharing trusts and individual retirement accounts, generally are exempt from U.S. federal income taxation. However, they are subject to taxation on their unrelated business taxable income or UBTI. Distributions by us to a shareholder that is a tax-exempt entity should generally not constitute UBTI, as defined in Section 512(a) of the Code provided that the tax-exempt entity has not financed the acquisition of its shares with “acquisition indebtedness” within the meaning of the Code and the shares are not otherwise used in an unrelated trade or business of the tax-exempt entity. Tax-exempt U.S. Shareholders that are social clubs, voluntary employee benefit associations, supplemental unemployment benefit trusts, and qualified group legal services plans exempt from U.S. federal income taxation under sections 501(c)(7), (c)(9), (c)(17) and (c)(20) of the Code, respectively, are subject to different UBTI rules, which generally will require them to characterize distributions from us as UBTI.

In certain circumstances, a pension trust (1) that is described in Section 401(a) of the Code, (2) is tax exempt under section 501(a) of the Code, and (3) that owns more than 10% of our shares could be required to treat a percentage of the dividends from us as UBTI if we are a “pension-held REIT.” We will not be a pension-held REIT unless (1) either (A) one pension trust owns more than 25% of the value of our shares, or (B) a group of pension trusts, each individually holding more than 10% of the value of our shares, collectively owns more than 50% of such shares and (2) we would not have qualified as a REIT but for the fact that Section 856(h)(3) of the Code provides that shares owned by such trusts shall be treated, for purposes of the requirement that not more than 50% of the value of the outstanding shares of a REIT is owned, directly or indirectly, by five or fewer “individuals” (as defined in the Code to include certain entities). Certain restrictions on ownership and transfer of our shares should generally prevent a tax-exempt entity from owning more than 10% of the value of our shares, or us from becoming a pension-held REIT.

Exhibit 99.1

Tax-exempt U.S. Shareholders are urged to consult their tax advisor regarding the U.S. federal, state, local and foreign tax consequences of the acquisition, ownership and disposition of our shares.

Taxation of Non-U.S. Shareholders

The rules governing United States federal income taxation of non-U.S. Shareholders are complex and no attempt will be made herein to provide more than a summary of such rules. Prospective non-U.S. Shareholders should consult with their own tax advisors to determine the impact of federal, state and local income and estate tax laws with regard to an investment in our shares, including any reporting requirements.

Ordinary Dividends

The portion of Ordinary Dividends received by non-U.S. Shareholders that are not attributable to gain from sales or exchanges by us of United States real property interests and which are not effectively connected with a U.S. trade or business of the non-U.S. Shareholder will generally be subject to a withholding tax equal to 30% of the gross amount of the distribution unless an applicable tax treaty reduces or eliminates that tax. Under some treaties, however, the lower rates generally applicable to dividends do not apply to dividends from REITs. We intend to withhold United States income tax at the rate of 30% on the gross amount of any such Ordinary Dividends paid to a non-U.S. Shareholder unless (1) a lower treaty rate applies and the non-U.S. Shareholder files a W-8 BEN (or applicable substitute form) claiming the benefits of the lower treaty rate or (2) the non-U.S. Shareholder files an IRS Form W-8 ECI with us claiming that the distribution is effectively connected with a U.S. trade or business.

In general, non-U.S. Shareholders will not be considered to be engaged in a U.S. trade or business solely as a result of their ownership of our shares. If income from the investment in our shares is treated as effectively connected with the non-U.S. Shareholder’s conduct of a United States trade or business, the non-U.S. Shareholder generally will be subject to a tax at graduated rates, in the same manner as U.S. Shareholders are taxed with respect to such distributions (and may also be subject to the 30% branch profits tax in the case of a shareholder that is a foreign corporation).

Non-Dividend Distributions

Unless our shares constitute a U.S. real property interest (“USRPI”), any Non-Dividend Distributions will not be taxable to a shareholder to the extent that such distributions do not exceed the adjusted basis of the shareholder’s shares, but rather will reduce the adjusted basis of the shareholder in such shares. To the extent that Non-Dividend Distributions exceed the adjusted basis of a non-U.S. Shareholder’s shares, such distributions will give rise to tax liability if the non-U.S. Shareholder would otherwise be subject to tax on any gain from the sale or disposition of its shares, as described below (See -- Taxation of Non-U.S. Shareholders -- Dispositions of our Shares). If it cannot be determined at the time a distribution is made whether or not such distribution will be in excess of current and accumulated earnings and profits, the distributions will be subject to withholding at the same rate as Ordinary Dividends. Because we generally cannot determine at the time we make a distribution whether or not the distribution will exceed our current and accumulated earnings and profits, we normally will withhold tax on the entire amount of any distribution at the same rate as we would withhold on Ordinary Dividends. However, amounts thus withheld are refundable to the non-U.S. Shareholder if it is subsequently determined that such distribution was, in fact, in excess of our current and accumulated earnings and profits.

If our shares constitute a USRPI, as described below (See -- Taxation of Non-U.S. Shareholders -- Dispositions of our Shares), Non-Dividend Distributions by us in excess of the non-U.S. Shareholder’s adjusted tax basis in our shares will be taxed under the Foreign Investment in Real Property Tax Act of 1980 (“FIRPTA”) at the rate of tax, including any applicable capital gains rates, that would apply to a U.S. Shareholder of the same type (e.g., an individual or a corporation, as the case may be), and the collection of the tax will be enforced by a refundable withholding at a rate of 10% of the Non-Dividend Distribution.

Capital Gain Distributions

Except as discussed below with respect to 5% or less holders of regularly traded classes of shares, distributions that are attributable to gain from sales or exchanges by us of United States real property interests will be taxed to a non-U.S. Shareholder under the provisions of FIRPTA Under FIRPTA, distributions attributable to gain from sales of United States real property interests are taxed to a non-U.S. Shareholder as if such gain were effectively connected with a United States business. Individuals who are non-U.S. Shareholders will be required to report such gain on a U.S. federal income tax return and such gain will be taxed at the normal capital gain rates applicable to U.S. individual shareholders (subject to applicable alternative minimum tax and a special alternative minimum tax in the case of nonresident alien individuals). Also, distributions subject to

Exhibit 99.1

FIRPTA may be subject to a 30% branch profits tax in the hands of a foreign corporate shareholder not entitled to treaty relief. Brandywine is required by applicable Treasury Regulations to withhold 35% of any distribution that could be designated by us as a capital gains dividend. The amount is creditable against the non-U.S. Shareholder’s U.S. tax liability.

However, distributions attributable to gain from sales or exchanges by us of United States real property interests are treated as ordinary dividends (not subject to the 35% withholding tax under FIRPTA) if the distribution is made to a non-U.S. Shareholder with respect to any class of shares which is “regularly traded” on an established securities market located in the United States and if the non-U.S. Shareholder did not own more than 5% of such class of shares at any time during the taxable year. Such distributions will generally be subject to a 30% U.S. withholding tax (subject to reduction under applicable treaty) and a non-U.S. Shareholder will not be required to report the distribution on a U.S. tax return. In addition, the branch profits tax will not apply to such distributions. See “Taxation of Non-U.S. Shareholders - Ordinary Dividends.”

Dividends Paid in Common Shares

A recent Internal Revenue Service revenue procedure allows us to satisfy the REIT distribution requirements with respect to certain taxable years by distributing up to 90% of our dividends in the form of common shares rather than cash. In the event that we pay a portion of a dividend in common shares, we may be required to withhold U.S. tax with respect to such dividend, including in respect of all or a portion of such dividend that is payable in common shares.

Dispositions of our Shares

Unless our shares constitutes a USRPI, gain recognized by a non-U.S. Shareholder upon a sale of shares generally will not be taxed under FIRPTA. Our shares will not be treated as a USRPI if Brandywine is a “domestically controlled REIT,” defined generally as a REIT in which at all times during a specified testing period less than 50% in value of the shares of beneficial interest was held directly or indirectly by foreign persons. It is currently anticipated that we will be a “domestically controlled REIT,” and therefore the sale of shares by a non-U.S. Shareholder will not be subject to taxation under FIRPTA. However, because the shares may be traded, we cannot be sure that we will continue to be a “domestically controlled REIT.” Further, even if we are a domestically controlled REIT, pursuant to “wash sale” rules under FIRPTA, a non-U.S. Shareholder may incur tax under FIRPTA to the extent such non-U.S. Shareholder disposes of our shares within a certain period prior to a capital gain distribution and directly or indirectly (including through certain affiliates) reacquires our shares within certain prescribed periods.

However, a non-U.S. shareholder will not incur tax under FIRPTA on a sale of common or preferred shares if (1) our preferred shares or common shares is “regularly traded” on an established securities market within the meaning of applicable Treasury regulations and (2) the non-U.S. Shareholder did not actually, or constructively under specified attribution rules under the Code, own more than 5% of our preferred shares or common shares at any time during the shorter of the five-year period preceding the disposition or the holder’s holding period.

Even if our common or preferred shares were not regularly traded on an established securities market, a non-U.S. Shareholder would not be subject to taxation under FIRPTA as a sale of a U.S. real property interest if such non-U.S. Shareholder’s common or preferred shares had a fair market value on the date of acquisition that was equal to or less than 5% of our regularly traded class of shares with the lowest fair market value. For purposes of this test, if a non-U.S. Shareholder acquired shares of common or preferred shares and subsequently acquired additional shares at a later date, then all such shares would be aggregated and valued as of the date of the subsequent acquisition.

If gain on the sale of our shares is subject to taxation under FIRPTA, the non-U.S. Shareholder will be subject to the same treatment as a U.S. Shareholder with respect to such gain, subject to applicable alternative minimum tax and a special alternative minimum tax in the case of non-resident alien individuals, and the purchaser of the shares could be required to withhold 10% of the purchase price and remit such amount to the Internal Revenue Service. Gain not subject to FIRPTA will nonetheless be taxable in the United States to a non-U.S. Shareholder if (1) investment in the shares is effectively connected with the non-U.S. Shareholder’s United States trade or business, in which case the non-U.S. Shareholder will be subject to the same treatment as U.S. Shareholders with respect to such gain or (2) the non-U.S. Shareholder is a nonresident alien individual who was present in the United States for 183 days or more during the taxable year, in which case the nonresident alien individual will be subject to a 30% tax on the individual’s capital gains.

Exhibit 99.1

Information Reporting and Backup Withholding Applicable to non-U.S. Shareholders

We must report annually to the IRS and to each non-U.S. Shareholder the amount of dividends paid to such holder and the tax withheld with respect to such dividends, regardless of whether withholding was required. Copies of the information returns reporting such dividends and withholding may also be made available to the tax authorities in the country in which the non-U.S. Shareholder resides under the provisions of an applicable income tax treaty.

Payments of dividends or of proceeds from the disposition of stock made to a non-U.S. Shareholder may be subject to information reporting and backup withholding unless such holder establishes an exemption, for example, by properly certifying its non-United States status on an IRS Form W-8 BEN or another appropriate version of IRS Form W-8. Notwithstanding the foregoing, backup withholding may apply if either we or our paying agent has actual knowledge, or reason to know, that a non-U.S. Shareholder is a United States person.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against the shareholder’s income tax liability, provided the required information is furnished to the Internal Revenue Service.

State, Local and Foreign Tax Consequences

Brandywine, the Operating Partnership, the Subsidiary Partnerships and Brandywine’s shareholders may be subject to state, local and foreign taxation in various jurisdictions, including those in which it or they transact business or reside. The state, local and foreign tax treatment of Brandywine, the Operating Partnership, the Subsidiary Partnerships and Brandywine’s shareholders may not conform to the federal income tax consequences discussed above. Any foreign taxes incurred by us would not pass through to shareholders as a credit against their U.S. federal income tax liability. Prospective shareholders should consult their own tax advisors regarding the effect of state, local and foreign tax laws on an investment in our shares.

Legislative or Other Actions Affecting REITs

The rules dealing with U.S. federal income taxation are constantly under review by persons involved in the legislative process and by the Internal Revenue Service and the U.S. Treasury Department. No assurance can be given as to whether, when, or in what form, the U.S. federal income tax laws applicable to us and our shareholders may be enacted. Changes to the U.S. federal tax laws and interpretations of U.S. federal tax laws could adversely affect an investment in our shares.

Taxation of Holders of Debt Securities

This section describes the material United States federal income tax consequences of owning the debt securities that Brandywine Realty Trust or Brandywine Operating Partnership may offer. This summary is for general information only and is not tax advice. The tax consequences of owning any particular issue of debt securities will be discussed in the applicable prospectus.

As used herein, a “U.S. Holder” means a beneficial owner of our debt securities, who is, for U.S. federal income tax purposes:

• a citizen or resident of the U.S. as defined in section 7701(b) of the Code,

• a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the U.S. or any state thereof or the District of Columbia,

• an estate the income of which is subject to U.S. federal income taxation regardless of its source or

• a trust if it (a) is subject to the primary supervision of a court within the U.S. and one or more U.S. persons have the authority to control all substantial decisions of the trust or (b) has a valid election in effect under applicable U.S. Treasury regulations to be treated as a U.S. person.

As used herein, a “non-U.S. Holder” means a beneficial owner of our debt securities that is not a “U.S. Holder,” and that is not a partnership (or other entity treated as a partnership for U.S. federal income tax purposes).

If a partnership holds debt securities, the tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding debt securities, you should consult your tax advisors.

Exhibit 99.1

Taxation of U.S. Holders

Interest

The stated interest on debt securities generally will be taxable to a U.S. Holder as ordinary income at the time that it is paid or accrued, in accordance with the U.S. Holder’s method of accounting for United States federal income tax purposes.

Original Issue Discount

If you own debt securities issued with original issue discount (“OID”), you will be subject to special tax accounting rules, as described in greater detail below. In that case, you should be aware that you generally must include OID in gross income in advance of the receipt of cash attributable to that income. However, you generally will not be required to include separately in income cash payments received on the debt securities, even if denominated as interest, to the extent those payments do not constitute “qualified stated interest,” as defined below. If we determine that a particular debt security will be an OID debt security, we will disclose that determination in the prospectus relating to those debt securities.

A debt security with an “issue price” that is less than the “stated redemption price at maturity” (the sum of all payments to be made on the debt security other than “qualified stated interest”) generally will be issued with OID if that difference is at least 0.25% of the stated redemption price at maturity multiplied by the number of complete years to maturity. The “issue price” of each debt security in a particular offering will be the first price at which a substantial amount of that particular offering is sold to the public. The term “qualified stated interest” means stated interest that is unconditionally payable in cash or in property, other than debt instruments of the issuer, and the interest to be paid meets all of the following conditions:

• it is payable at least once per year;

• it is payable over the entire term of the debt security; and

• it is payable at a single fixed rate or, subject to certain conditions, based on one or more interest indices.

If we determine that particular debt securities of a series will bear interest that is not qualified stated interest, we will disclose that determination in the prospectus relating to those debt securities.

If you own a debt security issued with “de minimis” OID, which is discount that is not OID because it is less than 0.25% of the stated redemption price at maturity multiplied by the number of complete years to maturity, you generally must include the de minimis OID in income at the time principal payments on the debt securities are made in proportion to the amount paid. Any amount of de minimis OID that you have included in income will be treated as capital gain.

Certain of the debt securities may contain provisions permitting them to be redeemed prior to their stated maturity at our option and/or at your option. OID debt securities containing those features may be subject to rules that differ from the general rules discussed herein. If you are considering the purchase of OID debt securities with those features, you should carefully examine the applicable prospectus and should consult your own tax advisors with respect to those features since the tax consequences to you with respect to OID will depend, in part, on the particular terms and features of the debt securities.

If you own OID debt securities with a maturity upon issuance of more than one year you generally must include OID in income in advance of the receipt of some or all of the related cash payments using the “constant yield method” described in the following paragraphs. This method takes into account the compounding of interest.

The amount of OID that you must include in income if you are the initial United States holder of an OID debt security is the sum of the “daily portions” of OID with respect to the debt security for each day during the taxable year or portion of the taxable year in which you held that debt security (“accrued OID”). The daily portion is determined by allocating to each day in any “accrual period” a pro rata portion of the OID allocable to that accrual period. The “accrual period” for an OID debt security may be of any length and may vary in length over the term of the debt security, provided that each accrual period is no longer than one year and each scheduled payment of principal or interest occurs on the first day or the final day of an accrual period. The amount of OID allocable to any accrual period is an amount equal to the excess, if any, of:

• the debt security’s “adjusted issue price” at the beginning of the accrual period multiplied by its yield to maturity, determined on the basis of compounding at the close of each accrual period and properly adjusted for the length of the accrual period, over

• the aggregate of all qualified stated interest allocable to the accrual period.

OID allocable to a final accrual period is the difference between the amount payable at maturity, other than a payment of qualified stated interest, and the adjusted issue price at the beginning of the final accrual period. Special rules will apply for calculating OID for an initial short accrual period. The “adjusted issue price” of a debt security at the beginning of any accrual

Exhibit 99.1

period is equal to its issue price increased by the accrued OID for each prior accrual period, determined without regard to the amortization of any acquisition or bond premium, as described below, and reduced by any payments made on the debt security (other than qualified stated interest) on or before the first day of the accrual period. Under these rules, you will generally have to include in income increasingly greater amounts of OID in successive accrual periods. We are required to provide information returns stating the amount of OID accrued on debt securities held of record by persons other than corporations and other exempt holders.

Floating rate debt securities are subject to special OID rules. In the case of an OID debt security that is a floating rate debt security, both the “yield to maturity” and “qualified stated interest” will be determined solely for purposes of calculating the accrual of OID as though the debt security will bear interest in all periods at a fixed rate generally equal to the rate that would be applicable to interest payments on the debt security on its date of issue or, in the case of certain floating rate debt securities, the rate that reflects the yield to maturity that is reasonably expected for the debt security. Additional rules may apply if either:

• the interest on a floating rate debt security is based on more than one interest index; or

• the principal amount of the debt security is indexed in any manner.

This discussion does not address the tax rules applicable to debt securities with an indexed principal amount. If you are considering the purchase of floating rate OID debt securities or securities with indexed principal amounts, you should carefully examine the prospectus relating to those debt securities, and should consult your own tax advisors regarding the United States federal income tax consequences to you of holding and disposing of those debt securities.

You may elect to treat all interest on any debt securities as OID and calculate the amount includible in gross income under the constant yield method described above. For purposes of this election, interest includes stated interest, acquisition discount, OID, de minimis OID, market discount, de minimis market discount and unstated interest, as adjusted by any amortizable bond premium or acquisition premium. You must make this election for the taxable year in which you acquired the debt security, and you may not revoke the election without the consent of the Internal Revenue Service (the “IRS”). You should consult with your own tax advisors about this election.

Market Discount

If you purchase debt securities, other than OID debt securities, for an amount that is less than their stated redemption price at maturity, or, in the case of OID debt securities, their adjusted issue price, the amount of the difference will be treated as “market discount” for United States federal income tax purposes, unless that difference is less than a specified de minimis amount. Under the market discount rules, you will be required to treat any principal payment on, or any gain on the sale, exchange, retirement or other disposition of, the debt securities as ordinary income to the extent of the market discount that you have not previously included in income and are treated as having accrued on the debt securities at the time of their payment or disposition. In addition, you may be required to defer, until the maturity of the debt securities or their earlier disposition in a taxable transaction, the deduction of all or a portion of the interest expense on any indebtedness attributable to the debt securities. You may elect, on a debt security-by-debt security basis, to deduct the deferred interest expense in a tax year prior to the year of disposition. You should consult your own tax advisors before making this election.

Any market discount will be considered to accrue ratably during the period from the date of acquisition to the maturity date of the debt securities, unless you elect to accrue on a constant interest method. You may elect to include market discount in income currently as it accrues, on either a ratable or constant interest method, in which case the rule described above regarding deferral of interest deductions will not apply. Your election to include market discount in income currently, once made, applies to all market discount obligations acquired by you on or after the first taxable year to which your election applies and may not be revoked without the consent of the IRS. You should consult your own tax advisor before making this election.

Acquisition Premium and Amortizable Bond Premium

If you purchase OID debt securities for an amount that is greater than their adjusted issue price but equal to or less than the sum of all amounts payable on the debt securities after the purchase date other than payments of qualified stated interest, you will be considered to have purchased those debt securities at an “acquisition premium.” Under the acquisition premium rules, the amount of OID that you must include in gross income with respect to those debt securities for any taxable year will be reduced by the portion of the acquisition premium properly allocable to that year.

If you purchase debt securities (including OID debt securities) for an amount in excess of the sum of all amounts payable on those debt securities after the purchase date other than qualified stated interest, you will be considered to have purchased those debt securities at a “premium” and, if they are OID debt securities, you will not be required to include any OID

Exhibit 99.1

in income. You generally may elect to amortize the premium over the remaining term of those debt securities on a constant yield method as an offset to interest when includible in income under your regular accounting method. In the case of debt securities that provide for alternative payment schedules, bond premium is calculated by assuming that (a) you will exercise or not exercise options in a manner that maximizes your yield, and (b) we will exercise or not exercise options in a manner that minimizes your yield (except that we will be assumed to exercise call options in a manner that maximizes your yield). If you do not elect to amortize bond premium, that premium will decrease the gain or increase the loss you would otherwise recognize on disposition of the debt security. Your election to amortize premium on a constant yield method will also apply to all debt obligations held or subsequently acquired by you on or after the first day of the first taxable year to which the election applies. You may not revoke the election without the consent of the IRS. You should consult your own tax advisor before making this election.

Sale, Exchange and Retirement of Debt Securities

A U.S. Holder of debt securities will recognize gain or loss upon the sale, exchange, retirement, redemption or other taxable disposition of such debt securities in an amount equal to the difference between:

• the amount of cash and the fair market value of other property received in exchange for such debt securities, other than amounts attributable to accrued but unpaid stated interest, which will be subject to tax as ordinary income to the extent not previously included in income; and

• the U.S. Holder’s adjusted tax basis in such debt securities.

A U.S. Holder’s adjusted tax basis in a debt security generally will equal the cost of the debt security to such holder (A) increased by the amount of OID or accrued market discount (if any) previously included in income by such holder and (B) decreased by the amount of any payments other than qualified stated interest payments and any amortizable bond premium taken by the holder.

Any gain or loss recognized will generally be capital gain or loss, and such capital gain or loss will generally be long-term capital gain or loss if the debt security has been held by the U.S. Holder for more than one year. Long-term capital gain for non-corporate taxpayers is subject to reduced rates of United States federal income taxation (20% maximum federal rate). The deductibility of capital losses is subject to certain limitations.

If a U.S. Holder recognizes a loss upon a subsequent disposition of our debt securities in an amount that exceeds a prescribed threshold, it is possible that the provisions of Treasury Regulations involving “reportable transactions” could apply, with a resulting requirement to separately disclose the loss generating transactions to the IRS. While these regulations are directed towards “tax shelters,” they are written broadly, and apply to transactions that would not typically be considered tax shelters. Significant penalties apply for failure to comply with these requirements. You should consult your tax advisors concerning any possible disclosure obligation with respect to the receipt or disposition of our debt securities, or transactions that might be undertaken directly or indirectly by us. Moreover, you should be aware that we and other participants in transactions involving us (including our advisors) might be subject to disclosure or other requirements pursuant to these regulations.

Taxation of Tax-Exempt Holders of Debt Securities

Assuming the debt security is debt for tax purposes, interest income accrued on the debt security should not constitute unrelated business taxable income to a tax-exempt holder. As a result, a tax-exempt holder generally should not be subject to U.S. federal income tax on the interest income accruing on our debt securities. Similarly, any gain recognized by the tax-exempt holder in connection with a sale of the debt security generally should not be unrelated business taxable income. However, if a tax-exempt holder were to finance its acquisition of the debt security with debt, a portion of the interest income and gain attributable to the debt security would constitute unrelated business taxable income pursuant to the “debt-financed property” rules. Tax-exempt holders should consult their own counsel to determine the potential tax consequences of an investment in our debt securities.

Taxation of Non-U.S. Holders of Debt Securities

The rules governing the U.S. federal income taxation of a Non-U.S. Holder are complex and no attempt will be made herein to provide more than a summary of such rules. Non-U.S. Holders should consult their tax advisors to determine the effect of U.S. federal, state, local and foreign tax laws, as well as tax treaties, with regard to an investment in the debt securities.

Exhibit 99.1

Interest

Interest (including OID) paid to a non-U.S. Holder of debt securities will not be subject to United States federal withholding tax under the “portfolio interest exception,” provided that:

• interest paid on debt securities is not effectively connected with a non-U.S. Holder’s conduct of a trade or business in the United States;

• the non-U.S. Holder does not actually or constructively own 10% or more of the capital or profits interest in the Operating Partnership (in the case of debt issued by the Operating Partnership), or 10% or more of the shares of Brandywine (in the case of debt issued by Brandywine);

• the non-U.S. Holder is not

◦ a controlled foreign corporation that is related to the Operating Partnership or Brandywine, as applicable, or

◦ a bank that receives such interest on an extension of credit made pursuant to a loan agreement entered into in the ordinary course of its trade or business; and

• the beneficial owner of debt securities provides a certification, which is generally made on an IRS Form W-8BEN or a suitable substitute form and signed under penalties of perjury, that it is not a United States person.

A payment of interest (including OID) to a non-U.S. Holder that does not qualify for the portfolio interest exception and that is not effectively connected to a United States trade or business will be subject to United States federal withholding tax at a rate of 30%, unless a United States income tax treaty applies to reduce or eliminate withholding.

A non-U.S. Holder will generally be subject to tax in the same manner as a U.S. Holder with respect to payments of interest (including OID) if such payments are effectively connected with the conduct of a trade or business by the non-U.S. Holder in the United States and, if an applicable tax treaty provides, such gain is attributable to a United States permanent establishment maintained by the non-U.S. Holder. In some circumstances, such effectively connected income received by a non-U.S. Holder which is a corporation may be subject to an additional “branch profits tax” at a 30% base rate or, if applicable, a lower treaty rate.

To claim the benefit of a lower treaty rate or to claim exemption from withholding because the income is effectively connected with a United States trade or business, the non-U.S. Holder must provide a properly executed IRS Form W-8BEN or IRS Form W-8ECI, or a suitable substitute form, as applicable, prior to the payment of interest. Such certificate must contain, among other information, the name and address of the non-U.S. Holder.

Non-U.S. Holders are urged to consult their own tax advisors regarding applicable income tax treaties, which may provide different rules.

Sale or Retirement of Debt Securities

A non-U.S. Holder generally will not be subject to United States federal income tax or withholding tax on gain realized on the sale, exchange or redemption of debt securities unless:

• the non-U.S. Holder is an individual who is present in the United States for 183 days or more in the taxable year of the sale, exchange or redemption, and certain other conditions are met; or

• the gain is effectively connected with the conduct of a trade or business of the non-U.S. Holder in the United States and, if an applicable tax treaty so provides, such gain is attributable to a United States permanent establishment maintained by such holder.

Except to the extent that an applicable tax treaty provides otherwise, a non-U.S. Holder will generally be subject to tax in the same manner as a U.S. Holder with respect to gain realized on the sale, exchange or redemption of debt securities if such gain is effectively connected with the conduct of a trade or business by the non-U.S. Holder in the United States and, if an applicable tax treaty provides, such gain is attributable to a United States permanent establishment maintained by the non-U.S. Holder. In certain circumstances, a non-U.S. Holder that is a corporation will be subject to an additional “branch profits tax” at a 30% rate or, if applicable, a lower treaty rate on such income.

Exhibit 99.1

U.S. Federal Estate Tax

Your estate will not be subject to U.S. federal estate tax on the debt securities beneficially owned by you at the time of your death, provided that any payment to you on the debt securities, including OID, would be eligible for exemption from the 30% U.S. federal withholding tax under the “portfolio interest” rule described above, without regard to the certification requirement.

Information Reporting and Backup Withholding Applicable to Holders of Debt Securities

U.S. Holders

Certain U.S. Holders may be subject to information reporting requirements on payments of principal and interest (including OID) on debt securities and payments of the proceeds of the sale, exchange, or redemption of debt securities, and backup withholding, currently imposed at a rate of 28%, may apply to such payment if the U.S. Holder:

• fails to furnish an accurate taxpayer identification number, or TIN, to the payor in the manner required;

• is notified by the IRS that it has failed to properly report payments of interest or dividends; or

• under certain circumstances, fails to certify, under penalties of perjury, that it has furnished a correct TIN and that it has not been notified by the IRS that it is subject to backup withholding.

Non-U.S. Holders

A non-U.S. Holder is generally not subject to backup withholding with respect to payments of interest (including OID) on debt securities if it certifies as to its status as a non-U.S. Holder under penalties of perjury or if it otherwise establishes an exemption, provided that neither we nor our paying agent has actual knowledge or reason to know that the non-U.S. Holder is a United States person or that the conditions of any other exemptions are not, in fact, satisfied. Information reporting requirements, however, will apply to payments of interest (including OID) to non-U.S. Holders where such interest is subject to withholding or exempt from United States withholding tax pursuant to a tax treaty. Copies of these information returns may also be made available under the provisions of a specific treaty or agreement to the tax authorities of the country in which the non-U.S. Holder resides.

The payment of the proceeds from the disposition of debt securities to or through the United States office of any broker, United States or foreign, will be subject to information reporting and possible backup withholding unless the owner certifies as to its non-United States status under penalties of perjury or otherwise establishes an exemption, provided that the broker does not have actual knowledge or reason to know that the non-U.S. Holder is a United States person or that the conditions of any other exemption are not, in fact, satisfied.

The payment of the proceeds from the disposition of debt securities to or through a non-United States office of a non-United States broker that is not a “United States related person” generally will not be subject to information reporting or backup withholding. For this purpose, a “United States related person” is:

a controlled foreign corporation for United States federal income tax purposes;

a foreign person 50% or more of whose gross income from all sources for the three-year period ending with the close of its taxable year preceding the payment, or for such part of the period that the broker has been in existence, is derived from activities that are effectively connected with the conduct of a United States trade or business; or

a foreign partnership that at any time during the partnership’s taxable year is either engaged in the conduct of a trade or business in the United States or of which 50% or more of its income or capital interests are held by United States persons.

In the case of the payment of proceeds from the disposition of debt securities to or through a non-United States office of a broker that is either a United States person or a United States related person, the payment may be subject to information reporting unless the broker has documentary evidence in its files that the owner is a non-U.S. Holder and the broker has no knowledge or reason to know to the contrary. Backup withholding will not apply to payments made through foreign offices of a

Exhibit 99.1

broker that is a United States person or a United States related person, absent actual knowledge that the payee is a United States person.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules from a payment to a Holder will be allowed as a refund or a credit against such Holder’s United States federal income tax liability, provided that the requisite procedures are followed.

Holders of debt securities are urged to consult their tax advisors regarding their qualification for exemption from backup withholding and the procedure for obtaining such an exemption, if applicable.

FATCA Withholding

U.S. tax legislation ("FATCA") enacted in 2010 and subsequent guidance provides that a 30% withholding tax will be imposed on payments of dividends on shares and interest on debt securities made after June 30, 2014 and payments of gross proceeds from the sale, exchange or other disposition of shares or debt securities made after December 31, 2016 to a foreign entity if such entity fails to satisfy certain new disclosure and reporting rules. In general, these new disclosure and reporting rules require that (i) in the case of a foreign financial entity, the entity identify and provide information in respect of financial accounts with such entity held (directly or indirectly) by U.S. persons and U.S.-owned foreign entities, and (ii) in the case of a non-financial foreign entity, the entity identify and provide information in respect of substantial U.S. owners of such entity. Additionally, various requirements and exceptions are provided under FATCA and additional or different requirements and exceptions may be provided in subsequent guidance. Prospective investors should consult their tax advisors regarding the possible implications of this legislation on their investment in common shares or preferred shares of Brandywine or debt securities of the Operating Partnership.

Medicare Tax on Investment Income

On March 30, 2010, the President signed into law the Health Care and Reconciliation Act of 2010 (the “Reconciliation Act”). The Reconciliation Act will require certain U.S. Shareholders and U.S. Holders who are individuals, estates or trusts and whose income exceeds certain thresholds to pay a 3.8% Medicare tax on “net investment income” which includes, among other things, dividends on shares, interest on debentures and capital gains from the sale or other disposition of shares or debentures, subject to certain exceptions. Prospective investors should consult their tax advisors regarding the effect, if any, of this legislation on their ownership and disposition of our common shares, preferred shares or debentures.

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Deferred Costs (Tables)

12 Months Ended

Dec. 31, 2013

Deferred Costs [Abstract]

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

As of December 31, 2013 and 2012, the Company’s deferred costs were comprised of the following (in thousands):

	December 31, 2013
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	155,885	$	(58,805	)	$	97,080
Financing Costs	40,317		(14,443		)	25,874
Total	$	196,202	$	(73,248	)	$	122,954

	December 31, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	150,331	$	(58,343	)	$	91,988
Financing Costs	40,246		(9,991		)	30,255
Total	$	190,577	$	(68,334	)	$	122,243

During the years ended December 31, 2013, 2012 and 2011, the Company capitalized internal direct leasing costs of $7.5 million, $7.5 million, and $6.6 million, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

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Organization of The Parent Company and The Operating Partnership (Details)	Dec. 31, 2013 acre
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	3.8
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Ownership in the Operating Partnership	98.80%
Net rentable square feet	24,800,000
Area Owned by Company of Undeveloped Parcels Of Land	432
Area of additional undeveloped parcels of land with option to purchase	51
Total potential development capacity	6,800,000
Unconsolidated real estate ventures [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of unconsolidated real estate ventures	17
Net rentable square feet	5,700,000
Wholly-owned management company subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	32,700,000
Third Parties and Unconsolidated Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	7,900,000
Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Ownership in the Operating Partnership	100.00%
Total Properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	204
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	176
Industrial facilities [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	19
Mixed-use properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	5
Development Property [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	1
Redevelopment Property [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	2
Re-entitlement Property [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	1

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Distributions Distributions (Tables)

12 Months Ended

Dec. 31, 2013

Distributions [Abstract]

Schedule of Dividends Payable [Table Text Block]

DISTRIBUTIONS

	Years ended December 31,
	2013			2012			2011
	(in thousands, except per share amounts)
Common Share Distributions:
Ordinary income	$	0.52		$	0.39		$	0.37
Capital gain	—			—			—
Non-taxable distributions	0.08			0.21			0.23
Distributions per share	$	0.60		$	0.60		$	0.60
Percentage classified as ordinary income	87.00		%	65.00		%	61.67		%
Percentage classified as capital gain	—		%	—		%	—		%
Percentage classified as non-taxable distribution	13.00		%	35.00		%	38.33		%
Preferred Share Distributions:
Total distributions declared	$	6,900		$	10,405		$	7,992
Percentage classified as ordinary income	100.00		%	100.00		%	100.00		%

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Investment in Unconsolidated Ventures Aggregate Principal Payments of Recourse and Non-recourse Debt Payable to Third-parties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity Method Investments and Joint Ventures [Abstract]
Loss on real estate venture formation	$ 0	$ (950)	$ (222)
Schedule of Equity Method Investments [Line Items]
2014	232,375
2015	409,654
2016	467,705
2017	330,323
2018	336,954
Thereafter	822,454
Equity Method Investment Summarized Financial Information Debt	699,860
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
2014	11,940
2015	191,304
2016	42,180
2017	13,937
2018	229,780
Thereafter	210,719
Equity Method Investment Summarized Financial Information Debt	$ 699,860

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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended				3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 02, 2010	Dec. 31, 2012 Restatement Adjustment [Member]	Sep. 30, 2012 Restatement Adjustment [Member]	Jun. 30, 2012 Restatement Adjustment [Member]	Dec. 31, 2011 Restatement Adjustment [Member]	Dec. 31, 2013 The Grove at Cira Centre South [Member]	Dec. 31, 2013 PJP VII [Member]	Dec. 31, 2013 Subsidiaries [Member]	Dec. 31, 2013 TB-BDN Plymouth Apartments [Member]
Summary of Significant Accounting Policies [Line Items]
Tax Basis of Assets, Cost for Income Tax Purposes											$ 4,000,000,000
Summary Of Significant Accounting Policies (Textuals) [Abstract]
Guarantor Obligations, Current Carrying Value									24,700,000	500,000		3,200,000
Revenue increased by straight-line rent adjustment	17,700,000	21,100,000	17,900,000
Increased revenue due to amortization of deferred rent	2,400,000		2,400,000
Decrease in revenue due to amortization of lease incentives	700,000	800,000	1,600,000
Increase in shares due to amendments in plan, shares solely available for options and share appreciation rights	2,983,569			3,600,000
Increase in Common shares available for future awards				6,000,000
Common shares available for future awards	5,195,177
Options awarded, term	one to ten-year
Award vesting term, minimum	1 year
Award vesting term, maximum	10 years
Stock-based compensation expense	8,300,000	8,600,000	6,400,000
Stock-based compensation expense, capitalized	1,400,000	2,600,000	1,500,000
Out of period stock compensation expense adjustment					600,000
Overstatement (Understatement) of Expense due to Out of Period Adjustment					$ 600,000	$ (200,000)	$ (300,000)	$ (100,000)
Treasury Stock, Shares		0

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Debt Obligations (Details Textuals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt obligations (Textuals)
Amortization of Financing Costs	$ 4,676,000	$ 6,208,000	$ 4,991,000
Early Repayment of Senior Debt	31,296,000
Gain (loss) on early extinguishment of debt	(2,119,000)	(22,002,000)	(2,776,000)
Unsecured Debt [Member]
Debt obligations (Textuals)
Long-term Debt, Gross	1,929,703,000	2,027,953,000
Secured Debt [Member]
Participating Mortgage Loans [Line Items]
Properties encumbered mortgage indebtedness carrying value, net	669,762,000	591,300,000
Debt obligations (Textuals)
Long-term Debt, Gross	669,762,000	443,942,000
Letter of Credit [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Letters of credit outstanding	1,300,000
New Revolving Credit Facility [Member] | Unsecured Debt [Member]
Participating Mortgage Loans [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Debt obligations (Textuals)
Unused availability under the Credit Facility	598,700,000
Option for additional borrowings subject to customary conditions and limitations	200,000,000
Long-term Debt, Gross	0	69,000,000
Note 2023 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Long-term Debt, Gross	250,000,000	250,000,000
$300.0M 5.750% Guaranteed Notes due 2012 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	300,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%
$250.0M 5.400% Guaranteed Notes due 2014 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Long-term Debt, Gross	218,549,000	238,379,000
$250.0M 7.500% Guaranteed Notes due 2015 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Long-term Debt, Gross	157,625,000	166,535,000
$250.0M 6.000% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Long-term Debt, Gross	149,919,000	150,429,000
$300.0M 5.700% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	300,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.70%
Long-term Debt, Gross	300,000,000	300,000,000
$325.0M 4.950% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	325,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%
Long-term Debt, Gross	325,000,000	325,000,000
Three Year Term Loan [Member] | Unsecured Debt [Member]
Participating Mortgage Loans [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt obligations (Textuals)
Debt instrument, face amount	150,000,000
Derivative, Average Fixed Interest Rate	2.596%
Long-term Debt, Gross	150,000,000	150,000,000
Seven Year Term Loan [Member] | Unsecured Debt [Member]
Participating Mortgage Loans [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
Debt obligations (Textuals)
Debt instrument, face amount	200,000,000
Derivative, Average Fixed Interest Rate	3.623%
Long-term Debt, Gross	200,000,000	200,000,000
Note Nine [Member] | Unsecured Debt [Member]
Debt obligations (Textuals)
Debt instrument, face amount	$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Federal Funds Rate [Member] | Bank Term Loan and the Credit Facility [Member]
Participating Mortgage Loans [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%

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Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate and Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the Beginning of the Year	$ 4,726,169	$ 4,793,080	$ 4,834,111
Additions:
Acquisitions	347,510	50,579	31,454
Capital Expenditures	109,740	90,619	133,550
Less:
Dispositions	(474,275)	(168,408)	(163,971)
Balance at the End of the Year	4,669,289	4,726,169	4,793,080
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the beginning of the year	954,665	865,710	776,078
Real Estate Accumulated Depreciation Additions [Abstract]
Depreciation expense — continuing operations	150,236	154,095	157,691
Depreciation expense — discontinued operations	9,164	2,143	1,185
SEC Schedule III, Real Estate, Other Deductions	(39,855)	(39,701)	(42,064)
Real Estate Accumulated Depreciation Less Dispositions [Abstract]
Dispositions	(91,890)	(28,270)	(62,022)
SEC Schedule III, Real Estate Accumulated Depreciation, Other Deductions	(38,367)	(39,013)	(7,222)
Balance at the end of the year	$ 983,808	$ 954,665	$ 865,710

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Partners Equity of The Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Earnings per Common Partnership Unit

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Amount allocable to unvested restricted unitholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred unit dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred unit redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common unitholders	31,719			31,719			(52,142		)	(52,142		)	(33,053		)	(33,053		)
Discontinued operations attributable to common unitholders	4,207			4,207			43,838			43,838			19,841			19,841
Net income (loss) attributable to common unitholders	$	35,926		$	35,926		$	(8,304	)	$	(8,304	)	$	(13,212	)	$	(13,212	)
Denominator
Weighted-average units outstanding	154,929,545			154,929,545			145,883,217			145,883,217			145,118,841			145,118,841
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average units outstanding	154,929,545			156,203,398			145,883,217			145,883,217			145,118,841			145,118,841
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.23	)	$	(0.23	)
Discontinued operations attributable to common unitholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common unitholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.09	)	$	(0.09	)

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2013

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Brandywine Realty Trust and Brandywine Operating Partnership, L.P.

Schedule II

Valuation and Qualifying Accounts

(in thousands)

Description	Balance at Beginning of Year		Additions		Deductions (1)		Balance at End of Year
Allowance for doubtful accounts:
Year-ended December 31, 2013	$	16,646	$	1,384	$	1,782	$	16,248
Year-ended December 31, 2012	$	15,485	$	1,891	$	730	$	16,646
Year-ended December 31, 2011	$	15,222	$	928	$	665	$	15,485

(1) Deductions represent amounts that the Company had fully reserved for in prior years and pursuit of collection of such amounts was ceased during the year.

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Debt Obligations (Details Textuals 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Line of Credit	$ 0	$ 69,000,000
Long Term Debt Maturities Repayments Of Principal	2,599,465,000
Extinguishment of Debt, Amount	29,250,000
Amortization of Financing Costs	4,676,000	6,208,000	4,991,000
Derivative, Gain (Loss) on Derivative, Net	0	(2,985,000)	0
Bank Term Loan And The Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period	0.29%	1.02%
Long-term Debt, Gross	1,929,703,000	2,027,953,000
Unsecured Debt [Member] | Three Year Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Derivative, Average Fixed Interest Rate	2.596%
Long-term Debt, Gross	150,000,000	150,000,000
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Long-term Debt, Gross	100,000,000	100,000,000
Unsecured Debt [Member] | Seven Year Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
Declining prepayment penalty in year three	1.00%
Derivative, Average Fixed Interest Rate	3.623%
Long-term Debt, Gross	200,000,000	200,000,000
Unsecured Debt [Member] | Three and Four Year Term Loan [Member]
Debt Instrument [Line Items]
Derivative, lower remaining maturity range	3 years
Derivative, higher remaining maturity range	5 years
Unsecured Debt [Member] | Note 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	250,000,000	250,000,000
Unsecured Debt [Member] | Note Five [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	157,625,000	166,535,000
Unsecured Debt [Member] | Note Six [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	149,919,000	150,429,000
Unsecured Debt [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	1,300,000
Unsecured Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Long-term Debt, Gross	0	69,000,000
Line of Credit Facility, Remaining Borrowing Capacity	598,700,000
Line of Credit Facility, Option for Additional Borrowing Capacity subject to customary conditions and limitations	200,000,000
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	5.73%	6.65%	6.72%
Long-term Debt, Gross	669,762,000	443,942,000
Note Six [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 510,000

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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Intangible assets
Total Cost	$ 196,147	$ 152,611
Accumulated Amortization	(63,818)	(81,991)
Intangible Assets, net	132,329	70,620
In-place lease value [Member]
Intangible assets
Total Cost	150,782	87,909
Accumulated Amortization	(35,607)	(42,894)
Intangible Assets, net	115,175	45,015
Tenant relationship value [Member]
Intangible assets
Total Cost	38,692	56,137
Accumulated Amortization	(26,868)	(37,389)
Intangible Assets, net	11,824	18,748
Above market leases acquired [Member]
Intangible assets
Total Cost	6,673	8,565
Accumulated Amortization	(1,343)	(1,708)
Intangible Assets, net	5,330	6,857
Below market leases acquired [Member]
Intangible assets
Total Cost	81,991	77,083
Accumulated Amortization	(47,547)	(43,224)
Intangible Assets, net	$ 34,444	$ 33,859

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Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,799,140
Stock-based compensation expense	$ 8,300,000	$ 8,600,000	$ 6,400,000
Stock-based compensation expense, capitalized	1,400,000	2,600,000	1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	0
Option activity
Outstanding at beginning of year, shares	3,337,549
Exercised, shares	(236,318)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(117,662)
Outstanding at end of year, shares	2,983,569.000	3,337,549
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.85
Exercised, Weighted Average Exercise Price	$ 9.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 18.61
Outstanding at end of year, Weighted Average Exercise Price	$ 15.50	$ 14.85
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 1 month 25 days	5 years 11 months 13 days
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	5 years 0 months 20 days
Outstanding at beginning of year, Aggregate Intrinsic Value	0
Outstanding at end of year, Aggregate Intrinsic Value	0	0
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	184,429
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	0 years 2 months 20 days
Stock-based compensation expense	700,000	1,600,000	1,400,000
Stock-based compensation expense, capitalized	$ 100,000	$ 500,000	$ 400,000
Option activity
Outstanding at end of year, shares	2,983,569

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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable	$ 13,000,000	$ 13,500,000
Tenant receivables and accrued rent receivables, gross	3,200,000	3,100,000
Notes receivable	7,026,000	7,226,000
Investment Income, Interest	1,044,000	3,008,000	1,810,000
Purchase money mortgage loan repayments terms	12/31/2012
20 Year Amortization Period [Member] | Purchase money mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	7,000,000	7,200,000
Interest rate	8.50%
Notes receivable amortization period, years	20 years		20 years
Due 2016 [Member] | Purchase money mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable amortization period, years	7 years		7 years
Proceeds from Collection of Notes Receivable	23,500,000
Trenton Properties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties sold			2
Gross deferred gain on sale of properties		12,900,000
Investment Income, Interest	$ 1,000,000

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Debt Obligations (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Schedule of principal payments of debt obligations
Repurchase Amount	$ 31,296
Principal	29,250
Loss	(2,119)
Deferred Financing Amortization	40
Note Four [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	20,822
Principal	19,830
Loss	(1,020)
Deferred Financing Amortization	16
Note Five [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	9,902
Principal	8,910
Loss	(1,036)
Deferred Financing Amortization	23
Note Six [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	572
Principal	510
Loss	(63)
Deferred Financing Amortization	$ 1
2012 5.750% Notes [Member]
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	5.75%
2014 5.400% Notes
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	5.40%
2015 7.500% Notes [Member]
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	7.50%

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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended		0 Months Ended	12 Months Ended					12 Months Ended
	Apr. 10, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 10, 2013 Dividend Declared [Member]	Dec. 10, 2013 Dividend Paid	Jan. 15, 2014 Series E Preferred Stock [Member]	Dec. 31, 2013 Series E Preferred Stock [Member]	Dec. 31, 2013 Class A Units [Member]	Dec. 31, 2012 Class A Units [Member]	Dec. 31, 2011 Class A Units [Member]	Nov. 05, 2013 Offering Program [Member]	Dec. 31, 2012 6.90% Series E Preferred Stock [Member]
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value			$ (103,448)										$ (43)
Net Proceeds from Issuance of Preferred Stock and Preference Stock		0	96,237	0
Stock Redeemed or Called During Period, Shares													(4,300,000)
Beneficiaries Equity of The Parent Company (Textuals) [Abstract]
Antidilutive securities excluded from computation of earnings per share									1,763,739	1,845,737	2,698,647
Distributions Declared, Per Share		$ 0.60	$ 0.60	$ 0.60	$ 0.15
Preferred Stock, Shares Issued		4,000,000	4,000,000
Shares authorized for Equity Offering Program												16,000,000
Issuance of Common Shares of Beneficial Interest, shares	12,650,000												4,000,000
Issuance of Common Shares of Beneficial Interest		182,034	96,850	8,272									40
Remaining shares available for sales												16,000,000
Additional shares Expected to be purchased under program		539,200
Dividends paid for preferred shares		6,900	10,405	7,992			1,700
Additional shares granted under option to purchase in public offering	1,650,000
Proceeds from Issuance of Common Stock	181,500	181,527	0	7,930
Percentage of Preferential return		6.90%						6.90%
Preferred Stock, Liquidation Preference Per Share								$ 25.00
Dividends Payable, Amount		25,584	23,652			23,900
Redemption Premium		$ 0	$ 4,052	$ 0

XML

Fair Value of Financial Instruments (Details Textuals)	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average Fair Value Interest Rate on Debt	4.534%

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Partners Equity of The Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator
Income (loss) from continuing operations, Basic									$ 38,982	$ (37,309)	$ (24,556)
Income (loss) from continuing operations, Diluted									38,982	(37,309)	(24,556)
Amount allocated to unvested restricted shareholders/unitholders, Basic									(363)	(376)	(505)
Amount allocable to unvested restricted unitholders, Diluted									(363)	(376)	(505)
Preferred share/unit dividends, Basic									(6,900)	(10,405)	(7,992)
Preferred share/unit dividends, Diluted									(6,900)	(10,405)	(7,992)
Redemption Premium									0	4,052	0
Preferred share/unit redemption Premium, Diluted									0	(4,052)	0
Income Loss from continuing operations available to common shareholders/unitholders, Basic									31,362	(51,279)	(32,059)
Income (loss) from continuing operations available to common unit holders, Diluted									31,362	(51,279)	(32,059)
Discontinued operations attributable to common unitholders									4,207	43,838	19,841
Net income (loss) attributable to Common Shareholders/Unitholders									35,514	(8,238)	(12,996)
Net income (loss) available to common shareholders/unitholders, Diluted									35,514	(8,238)	(12,996)
Denominator
Weighted-average shares/units outstanding, Basic									153,140,458	143,257,097	135,444,424
Contingent securities/Stock based compensation									1,273,853	0	0
Weighted-average shares/units outstanding, Diluted									154,414,311	143,257,097	135,444,424
Income per Common Partnership Unit:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic									$ 0.20	$ (0.36)	$ (0.24)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted									$ 0.20	$ (0.36)	$ (0.24)
Discontinued operations attributable to common shareholders/unitholders, Basic									$ 0.03	$ 0.30	$ 0.14
Discontinued operations attributable to common shareholders, Diluted									$ 0.03	$ 0.30	$ 0.14
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income (loss) from continuing operations, Basic									38,982	(37,309)	(24,556)
Income (loss) from continuing operations, Diluted									38,982	(37,309)	(24,556)
Amount allocated to unvested restricted shareholders/unitholders, Basic									(363)	(376)	(505)
Amount allocable to unvested restricted unitholders, Diluted									(363)	(376)	(505)
Preferred share/unit dividends, Basic									(6,900)	(10,405)	(7,992)
Preferred share/unit dividends, Diluted									(6,900)	(10,405)	(7,992)
Redemption Premium									0	4,052	0
Preferred share/unit redemption Premium, Diluted									0	(4,052)	0
Income Loss from continuing operations available to common shareholders/unitholders, Basic									31,719	(52,142)	(33,053)
Income (loss) from continuing operations available to common unit holders, Diluted									31,719	(52,142)	(33,053)
Discontinued operations attributable to common unitholders									4,207	43,838	19,841
Discontinued operations attributable to common unitholders, Diluted									4,207	43,838	19,841
Net income (loss) attributable to Common Shareholders/Unitholders									35,926	(8,304)	(13,212)
Net income (loss) available to common shareholders/unitholders, Diluted									$ 35,926	$ (8,304)	$ (13,212)
Denominator
Weighted-average shares/units outstanding, Basic									154,929,545	145,883,217	145,118,841
Contingent securities/Stock based compensation									1,273,853	0	0
Weighted-average shares/units outstanding, Diluted									156,203,398	145,883,217	145,118,841
Income per Common Partnership Unit:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic									$ 0.20	$ (0.36)	$ (0.23)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted									$ 0.20	$ (0.36)	$ (0.23)
Discontinued operations attributable to common shareholders/unitholders, Basic									$ 0.03	$ 0.30	$ 0.14
Discontinued operations attributable to common shareholders, Diluted									$ 0.03	$ 0.30	$ 0.14
Net income (loss) attributable to common shareholders/unitholders, Basic									$ 0.23	$ (0.06)	$ (0.09)
Net income (loss) attributable to common shareholders/unitholders, Diluted									$ 0.23	$ (0.06)	$ (0.09)

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Debt Obligations (Aggregate Scheduled Principal Payments of Debt Obligation, Excluding Amortization of Discounts and Premiums) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of debt repurchases
2014	$ 232,375
2015	409,654
2016	467,705
2017	330,323
2018	336,954
Thereafter	822,454
Total principal payments	2,599,465
Net unamortized premiums/(discounts)	(4,084)
Total Debt Obligations	$ 2,595,381	$ 2,465,330

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Deferred Costs (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Costs Net [Abstract]
Leasing Costs, Total Cost	$ 155,885	$ 150,331
Financing Costs, Total Cost	40,317	40,246
Total Cost	196,202	190,577
Leasing Costs, Accumulated Amortization	(58,805)	(58,343)
Financing Costs, Accumulated Amortization	(14,443)	(9,991)
Total, Accumulated Amortization	(73,248)	(68,334)
Leasing Costs, Deferred Costs, net	97,080	91,988
Financing Costs, Deferred Costs, net	25,874	30,255
Deferred Costs	$ 122,954	$ 122,243

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Distributions

12 Months Ended

Dec. 31, 2013

Distributions [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

DISTRIBUTIONS

	Years ended December 31,
	2013			2012			2011
	(in thousands, except per share amounts)
Common Share Distributions:
Ordinary income	$	0.52		$	0.39		$	0.37
Capital gain	—			—			—
Non-taxable distributions	0.08			0.21			0.23
Distributions per share	$	0.60		$	0.60		$	0.60
Percentage classified as ordinary income	87.00		%	65.00		%	61.67		%
Percentage classified as capital gain	—		%	—		%	—		%
Percentage classified as non-taxable distribution	13.00		%	35.00		%	38.33		%
Preferred Share Distributions:
Total distributions declared	$	6,900		$	10,405		$	7,992
Percentage classified as ordinary income	100.00		%	100.00		%	100.00		%

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Segment information

	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan Washington, D.C.			New Jersey/Delaware		Richmond, Virginia		Austin, Texas (a)			California		Corporate			Total
2013
Real estate investments, at cost:
Operating properties	$	1,199,105	$	1,300,666	$	1,214,965		$	414,716	$	310,397	$	36,856		$	192,584	$	—		$	4,669,289
Construction-in-progress																	74,174			74,174
Land inventory																	93,351			93,351
Total revenue	$	153,426	$	146,081	$	116,048		$	60,262	$	35,058	$	31,451		$	18,369	$	1,515		$	562,210
Property operating expenses, real estate taxes and third party management expenses	54,506		55,702		42,641			29,981		14,916		13,298			9,411		1,314			221,769
Net operating income	$	98,920	$	90,379	$	73,407		$	30,281	$	20,142	$	18,153		$	8,958	$	201		$	340,441
Investment in real estate ventures, at equity	$	17,272	$	19,975	$	59,905		$	—	$	1,400	$	81,960		$	—	$	—		$	180,512
Equity in income of real estate ventures	$	925	$	1,547	$	130		$	1,245	$	381	$	(564	)	$	—	$	—		$	3,664
2012
Real estate investments, at cost:
Operating properties	$	1,178,730	$	988,590	$	1,193,200		$	546,644	$	309,923	$	285,346		$	223,736	$	—		$	4,726,169
Construction-in-progress																	48,950			48,950
Land inventory																	102,439			102,439
Total revenue	$	150,075	$	131,592	$	107,656		$	59,671	$	35,701	$	32,379		$	17,463	$	1,142		$	535,679
Property operating expenses, real estate taxes and third party management expenses	52,657		50,787		41,485			28,506		14,484		13,951			9,043		(65		)	210,848
Net operating income	$	97,418	$	80,805	$	66,171		$	31,165	$	21,217	$	18,428		$	8,420	$	1,207		$	324,831
Investment in real estate ventures, at equity	$	33,160	$	27,859	$	49,169		$	17,294	$	1,245	$	64,828		$	—	$	—		$	193,555
Equity in income of real estate ventures	$	520	$	1,113	$	(648	)	$	1,803	$	269	$	(316	)	$	—	$	—		$	2,741
2011
Operating properties	$	1,218,071	$	953,870	$	1,255,803		$	545,657	$	307,698	$	257,694		$	254,287	$	—		$	4,793,080
Construction-in-progress																	25,083			25,083
Land inventory																	109,008			109,008
Total revenue	$	148,887	$	125,366	$	119,255		$	58,960	$	36,789	$	30,894		$	16,692	$	1,725		$	538,568
Property operating expenses, real estate taxes and third party management expenses	54,734		48,831		45,135			30,564		14,739		13,034			9,407		347			216,791
Net operating income	$	94,153	$	76,535	$	74,120		$	28,396	$	22,050	$	17,860		$	7,285	$	1,378		$	321,777
Investment in real estate ventures, at equity	$	5,264	$	13,397	$	24,671		$	6,168	$	1,163	$	65,144		$	—	$	—		$	115,807
Equity in income of real estate ventures	$	1,861	$	466	$	(277	)	$	1,157	$	510	$	58		$	—	$	—		$	3,775

(a) On October 16, 2013seven properties from the Austin portfolio were contributed to a newly formed real estate venture. Accordingly, the Company's 50% interest in the financial results of these seven properties for the period subsequent to October 16, 2013 is reported as a component of 'Equity in income of real estate ventures' in the Company's consolidated statements of operations and, as a result, no longer included as a component of net operating income. The Company acquired Four Points Centre in Austin, TX on December 19, 2013 and the financial results for this property are included in net operating income for the period owned. For additional information, see Notes 3 and 4 to our consolidated financial statements.

Reconciliation of consolidated net operating income

	Years Ended December 31,
	2013			2012			2011
Consolidated net operating income	$	340,441		$	324,831		$	321,777
Less:
Interest expense	(121,937		)	(132,939		)	(131,405		)
Interest expense - amortization of deferred financing costs	(4,676		)	(6,208		)	(4,991		)
Interest expense - financing obligation	(972		)	(850		)	—
Depreciation and amortization	(197,021		)	(188,382		)	(202,933		)
General and administrative expenses	(27,628		)	(25,413		)	(24,602		)
Plus:
Interest income	1,044			3,008			1,810
Historic tax credit transaction income	11,853			11,840			12,026
Recognized hedge activity	—			(2,985		)	—
Equity in income of real estate ventures	3,664			2,741			3,775
Net gain from remeasurement of investments in real estate ventures	6,866			—			—
Net gain on sales of interests in real estate	—			—			2,985
Net loss on sale of undepreciated real estate	(137		)	—			—
Net gain (loss) on real estate venture transactions	29,604			(950		)	(222		)
Loss on early extinguishment of debt	(2,119		)	(22,002		)	(2,776		)
Income (loss) from continuing operations	38,982			(37,309		)	(24,556		)
Income from discontinued operations	4,207			43,838			19,841
Net income (loss)	$	43,189		$	6,529		$	(4,715	)

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of financial instruments with fair values different from their carrying amount

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Mortgage notes payable	$	669,762	$	715,244	$	443,942	$	486,412
Unsecured notes payable	$	1,401,093	$	1,471,041	$	1,430,343	$	1,553,123
Variable rate debt	$	528,610	$	526,693	$	597,610	$	595,693
Notes receivable	$	7,026	$	7,759	$	7,226	$	7,783

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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Consolidated debt obligations
Plus: premiums/(discounts), net	$ (4,084,000)
Total mortgage indebtedness	670,151,000		442,974,000
Total Debt Obligations	2,595,381,000		2,465,330,000
Repayments of Unsecured Debt	0		190,485,000	145,500,000
Long Term Debt Maturities Repayments Of Principal	2,599,465,000
Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	669,762,000		443,942,000
Plus: premiums/(discounts), net	389,000		(968,000)
Total mortgage indebtedness	670,151,000		442,974,000
Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	1,929,703,000		2,027,953,000
Plus: premiums/(discounts), net	(4,473,000)		(5,597,000)
Total unsecured indebtedness	1,925,230,000		2,022,356,000
New Revolving Credit Facility [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	0		69,000,000
Debt Instrument, Interest Rate Terms	LIBOR + 1.50%
Debt Instrument Maturity Dates	Feb-16
Debt instrument, basis spread on variable rate	1.50%
Debt Instrument, Term	4 years
Option to extend Term Loan	1 year
Three-Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	150,000,000		150,000,000
Effective interest rate	2.60%
Debt Instrument Maturity Dates	Feb-15
Debt instrument, basis spread on variable rate	1.75%
Debt Instrument, Term	3 years
Option to extend Term Loan	1 year
Debt Instrument, Face Amount	150,000,000
Four-Year Term Loan - Variable [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	100,000,000		100,000,000
Debt Instrument, Interest Rate Terms	LIBOR + 1.75%
Debt Instrument Maturity Dates	Feb-16
Debt instrument, basis spread on variable rate	1.75%
Debt Instrument, Term	4 years
Option to extend Term Loan	1 year
Debt Instrument, Face Amount	100,000,000
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	200,000,000		200,000,000
Effective interest rate	3.62%
Debt Instrument Maturity Dates	Feb-19
Debt instrument, basis spread on variable rate	1.90%
Debt Instrument, Term	7 years
Debt Instrument, Face Amount	200,000,000
$300.0M 5.750% Guaranteed Notes due 2012 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Debt instrument stated interest rate	5.75%
Debt Instrument, Face Amount	300,000,000
$250.0M 5.400% Guaranteed Notes due 2014 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	218,549,000		238,379,000
Effective interest rate	5.53%
Debt Instrument Maturity Dates	Nov-14
Debt instrument stated interest rate	5.40%
Debt Instrument, Face Amount	250,000,000
$250.0M 7.500% Guaranteed Notes due 2015 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	157,625,000		166,535,000
Effective interest rate	7.76%
Debt Instrument Maturity Dates	May-15
Debt instrument stated interest rate	7.50%
Debt Instrument, Face Amount	250,000,000
$250.0M 6.000% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	149,919,000		150,429,000
Effective interest rate	5.95%
Debt Instrument Maturity Dates	Apr-16
Debt instrument stated interest rate	6.00%
Debt Instrument, Face Amount	250,000,000
$300.0M 5.700% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	300,000,000		300,000,000
Effective interest rate	5.68%
Debt Instrument Maturity Dates	May-17
Debt instrument stated interest rate	5.70%
Debt Instrument, Face Amount	300,000,000
$325.0M 4.950% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	325,000,000		325,000,000
Effective interest rate	5.13%
Debt Instrument Maturity Dates	Apr-18
Debt instrument stated interest rate	4.95%
Debt Instrument, Face Amount	325,000,000
Note 2023 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	250,000,000		250,000,000
Effective interest rate	4.02%
Debt Instrument Maturity Dates	Feb-23
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	27,062,000		27,062,000
Effective interest rate	2.75%
Debt Instrument Maturity Dates	Mar-35
Indenture IB (Preferred Trust I) [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	25,774,000		25,774,000
Effective interest rate	3.30%
Debt Instrument Maturity Dates	Apr-35
Indenture II (Preferred Trust II) [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	25,774,000		25,774,000
Effective interest rate	3.09%
Debt Instrument Maturity Dates	Jul-35
Tysons Corner [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	91,395,000		93,188,000
Effective interest rate	5.36%
Debt Instrument Maturity Dates	Aug-15
One Commerce Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	125,089,000		0
Effective interest rate	3.68%	[1]
Debt Instrument Maturity Dates	Jan-16
Two Logan Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	88,583,000		89,340,000
Effective interest rate	7.57%
Debt Instrument Maturity Dates	Apr-16
Fairview Eleven Tower [Member]
Participating Mortgage Loans [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	[2]
Fairview Eleven Tower [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	21,630,000		22,000,000
Effective interest rate	4.25%	[2]
Debt Instrument Maturity Dates	Jan-17
Two Commerce Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	112,000,000		0
Effective interest rate	4.51%	[1]
Debt Instrument Maturity Dates	Apr-23
IRS Philadelphia Campus [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	190,964,000		197,111,000
Effective interest rate	7.00%
Debt Instrument Maturity Dates	Sep-30
Cira South Garage [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	$ 40,101,000		$ 42,303,000
Effective interest rate	7.12%
Debt Instrument Maturity Dates	Sep-30

[1] This loan was assumed upon acquisition of the related properties on December 19, 2013. The interest rate reflects the market rate at the time of acquisition.

[2] (b)Represents the full debt amount of a property in a consolidated joint venture for which the Company maintains a 50% interest.

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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of consolidated net operating income
Consolidated net operating income									$ 340,441	$ 324,831	$ 321,777
Less:
Interest expense									(121,937)	(132,939)	(131,405)
Interest expense - amortization of deferred financing costs									(4,676)	(6,208)	(4,991)
Interest expense — financing obligation									(972)	(850)	0
Depreciation and amortization									(197,021)	(188,382)	(202,933)
Administrative expenses									(27,628)	(25,413)	(24,602)
Plus:
Interest income									1,044	3,008	1,810
Historic tax credit transaction income									11,853	11,840	12,026
Recognized hedge activity									0	(2,985)	0
Equity in income of real estate ventures									3,664	2,741	3,775
Net gain from remeasurement of investments in real estate ventures									6,866	0	0
Net gain on sale of interests in real estate									0	0	2,985
Net gain (loss) on sale of undepreciated real estate									(137)	0	0
Net gain (loss) on real estate venture transactions									29,604	(950)	(222)
Gain (loss) on early extinguishment of debt									(2,119)	(22,002)	(2,776)
Income (loss) from continuing operations									38,982	(37,309)	(24,556)
Income from discontinued operations									4,207	43,838	19,841
Net income (loss)	$ 21,002	$ 11,088	$ 7,180	$ 3,919	$ (26,698)	$ 17,089	$ 6,802	$ 9,336	$ 43,189	$ 6,529	$ (4,715)

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Real Estate Investments (Tables)

12 Months Ended

Dec. 31, 2013

Real Estate [Abstract]

Gross carrying value of the Company's Properties

	2013		2012
Land	$	680,513	$	662,107
Building and improvements	3,504,060		3,576,065
Tenant improvements	484,716		487,997
	$	4,669,289	$	4,726,169

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The Company has treated this transaction as a business combination and allocated the purchase price to the tangible and intangible assets and liabilities. As discussed in Note 2, the Company utilized a number of sources in making estimates of fair values for purposes of allocating the purchase price to tangible and intangibles assets acquired and intangible liabilities assumed. The purchase price is allocated as follows:

	December 19, 2013
Building, land and improvements	$	255,705
Intangible assets acquired	85,036
Below market lease liabilities assumed	(8,637		)
	$	332,104
Mortgage debt assumed - at fair value (1)	(238,082		)
Return of existing equity method investment	(30,424		)
Net working capital assumed	10,423
Non-controlling interest	(946		)
Total cash payment at settlement	$	73,075

(1) Principal outstanding on assumed mortgage debt at December 19, 2013 was $237.1 million.

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

Intangible assets acquired and intangible liabilities assumed consist of the following (in thousands):

	December 19, 2013			Weighted Average Amortization Period (in years)
Intangible assets:
In-place lease value	$	80,916		7.9
Above market tenant leases acquired	4,120			6.9
Total	$	85,036
Intangible liabilities:
Below market leases acquired	$	(8,637	)	6.5

Business Acquisition, Pro Forma Information [Table Text Block]

The unaudited pro forma information below summarizes the Company’s combined results of operations for the years ended December 31, 2013 and 2012 as though the acquisition of One and Two Commerce Square, Four Points Centre and Six Tower Bridge were completed on January 1, 2012. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor do they purport to represent the Company’s results of operations for future periods (in thousands except for per share amounts).

	December 31,
	2013		2012
Pro forma revenue	$	610,979	$	592,753
Pro forma income (loss) from continuing operations	21,805		(60,011		)
Pro forma net income (loss) available to common shareholders	25,957		(16,970		)
Earnings per common share from continuing operations:
Basic -- as reported	$	0.20	$	(0.36	)
Basic -- as pro forma	$	0.14	$	(0.42	)
Diluted -- as reported	$	0.20	$	(0.36	)
Diluted -- as pro forma	$	0.14	$	(0.42	)
Earnings per common share:
Basic -- as reported	$	0.23	$	(0.06	)
Basic -- as pro forma	$	0.17	$	(0.12	)
Diluted -- as reported	$	0.23	$	(0.06	)
Diluted -- as pro forma	$	0.17	$	(0.12	)

Included in the consolidated statements of income for the year ended December 31, 2013 are total revenues of $3.4 million and a net loss attributable to common shareholders of $0.2 million from acquisitions made during 2013.

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

Year	Minimum Rent
2014	$	1,303
2015	1,303
2016	1,303
2017	1,303
2018	1,303
Thereafter	57,540
Total	64,055

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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial position of the Real Estate Ventures
Equity Method Investment Summarized Financial Information Debt	$ 699,860
Company's share of equity (Company's basis)	180,512	193,555	115,807
Unconsolidated real estate ventures [Member]
Financial position of the Real Estate Ventures
Net property	965,475	923,536
Other Assets	164,152	174,677
Other Liabilities	49,442	53,645
Equity Method Investment Summarized Financial Information Debt	699,860	724,780
Equity	380,325	319,788
Company's share of equity (Company's basis)	$ 180,512	$ 193,555

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Summary of Significant Accounting Policies Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011
Income Tax Contingency [Line Items]
Increase In Revenue Due To Amortization Of Deferred Rent	$ 2,400,000	$ 2,400,000
Distributable Income Minimum Percentage	90.00%
Federal excise tax if sufficient taxable income is not distributed within prescribed time limits	4.00%
Excise tax equal to annual amount	4.00%
Excise tax, if sum of ordinary income	85.00%
Excise tax, if Net capital gain exceeds cash distributions and certain taxes paid	95.00%
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Income Tax Contingency [Line Items]
Tax Basis of Assets, Cost for Income Tax Purposes	$ 4,000,000,000

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Share Based and Deferred Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Option activity

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	3,337,549		$	14.85	5.95	$	—
Exercised	(236,318	)	$	9.86
Forfeited/Expired	(117,662	)	$	18.61
Outstanding at December 31, 2013	2,983,569		$	15.50	5.15	$	—
Vested/Exercisable at December 31, 2013	2,799,140		$	15.74	5.05	$	—

Company's restricted share activity

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2013	597,708		$	12.57
Granted	182,576		13.13
Vested	(208,306	)	13.13
Forfeited	(8,265	)	11.41
Non-vested at December 31, 2013	563,713		$	12.56

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental disclosure:
Capitalized interest	$ 2,012	$ 2,560	$ 1,997
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Supplemental disclosure:
Capitalized interest	$ 2,012	$ 2,560	$ 1,997

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Real Estate Investments Real Estate Investments, Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Dec. 19, 2013
One and Two Commerce Square [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	$ 255,705
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	85,036
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(8,637)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	332,104
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(238,082)
Business Combination, return of capital on equity method investment	(30,424)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	10,423
Business Combination, Total Cash Payment at Settlement	73,075
In-place lease value [Member] | One and Two Commerce Square [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	80,916
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years 10 months 24 days
Above Market Leases [Member] | One and Two Commerce Square [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	4,120
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 10 months 24 days
Finite-Lived Intangible Assets [Member] | One and Two Commerce Square [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	85,036
Below market leases acquired [Member] | One and Two Commerce Square [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	(8,637)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 6 months
Subsidiaries [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	$ (946)

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Risk Management and Use of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of derivative instruments in statement of financial position, fair value

Hedge Product	Hedge Type	Designation		Notional Amount				Strike		Trade Date	Maturity Date	Fair value
				12/31/2013		12/31/2012						12/31/2013			12/31/2012
Assets
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	549			(1,262		)
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.090	%	January 6, 2012	October 30, 2019	218			(1,129		)
				$	51,548	$	51,548					$	767		$	(2,391	)
Liabilities
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	(545	)	$	(8,859	)
Swap	Interest Rate	Cash Flow	(a)	77,000		77,000		2.703	%	December 9-13, 2011	February 1, 2016	(887		)	(1,343		)
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	(283		)	(458		)
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2011	May 1, 2015	(162		)	(245		)
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	(311		)	(914		)
				$	377,062	$	377,062					$	(2,188	)	$	(11,819	)

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Operating Leases

12 Months Ended

Dec. 31, 2013

Operating Leases [Abstract]

Operating Leases of Lessor Disclosure [Text Block]

OPERATING LEASES

The Company leases properties to tenants under operating leases with various expiration dates extending to 2030. Minimum future rentals on non-cancelable leases at December 31, 2013 are as follows (in thousands):

Year	Minimum Rent
2014	$	471,918
2015	457,315
2016	416,467
2017	358,368
2018	299,619
Thereafter	1,403,003

Total minimum future rentals presented above do not include amounts to be received as tenant reimbursements for operating costs

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Segment Information

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

During the year ended December 31, 2013, the Company was managing its portfolio within seven segments: (1) Pennsylvania, (2) Philadelphia Central Business District (CBD), (3) Metropolitan Washington D.C., (4) New Jersey/Delaware, (5) Richmond, Virginia, (6) Austin, Texas and (7) California. The Pennsylvania segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. The Metropolitan Washington, D.C. segment includes properties in Northern Virginia and southern Maryland. The New Jersey/Delaware segment includes properties in Burlington and Camden counties in New Jersey and in New Castle county in the state of Delaware. The Richmond, Virginia segment includes properties primarily in Albemarle, Chesterfield, Goochland and Henrico counties and one property in Durham, North Carolina. The Austin, Texas segment includes properties in Austin. On October 16, 2013, seven properties within the Austin portfolio were contributed to a newly formed real estate venture. After contributing the properties, the Company wholly owns only one property in Austin, Texas (For additional information, see Note 4). The California segment includes properties in Oakland, Concord, and Carlsbad. The corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions. Land held for development and construction in progress are transferred to operating properties by region upon completion of the associated construction or project.

Segment information for the three years ended December 31, 2013, 2012 and 2011 are as follows (in thousands):

	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan Washington, D.C.			New Jersey/Delaware		Richmond, Virginia		Austin, Texas (a)			California		Corporate			Total
2013
Real estate investments, at cost:
Operating properties	$	1,199,105	$	1,300,666	$	1,214,965		$	414,716	$	310,397	$	36,856		$	192,584	$	—		$	4,669,289
Construction-in-progress																	74,174			74,174
Land inventory																	93,351			93,351
Total revenue	$	153,426	$	146,081	$	116,048		$	60,262	$	35,058	$	31,451		$	18,369	$	1,515		$	562,210
Property operating expenses, real estate taxes and third party management expenses	54,506		55,702		42,641			29,981		14,916		13,298			9,411		1,314			221,769
Net operating income	$	98,920	$	90,379	$	73,407		$	30,281	$	20,142	$	18,153		$	8,958	$	201		$	340,441
Investment in real estate ventures, at equity	$	17,272	$	19,975	$	59,905		$	—	$	1,400	$	81,960		$	—	$	—		$	180,512
Equity in income of real estate ventures	$	925	$	1,547	$	130		$	1,245	$	381	$	(564	)	$	—	$	—		$	3,664
2012
Real estate investments, at cost:
Operating properties	$	1,178,730	$	988,590	$	1,193,200		$	546,644	$	309,923	$	285,346		$	223,736	$	—		$	4,726,169
Construction-in-progress																	48,950			48,950
Land inventory																	102,439			102,439
Total revenue	$	150,075	$	131,592	$	107,656		$	59,671	$	35,701	$	32,379		$	17,463	$	1,142		$	535,679
Property operating expenses, real estate taxes and third party management expenses	52,657		50,787		41,485			28,506		14,484		13,951			9,043		(65		)	210,848
Net operating income	$	97,418	$	80,805	$	66,171		$	31,165	$	21,217	$	18,428		$	8,420	$	1,207		$	324,831
Investment in real estate ventures, at equity	$	33,160	$	27,859	$	49,169		$	17,294	$	1,245	$	64,828		$	—	$	—		$	193,555
Equity in income of real estate ventures	$	520	$	1,113	$	(648	)	$	1,803	$	269	$	(316	)	$	—	$	—		$	2,741
2011
Operating properties	$	1,218,071	$	953,870	$	1,255,803		$	545,657	$	307,698	$	257,694		$	254,287	$	—		$	4,793,080
Construction-in-progress																	25,083			25,083
Land inventory																	109,008			109,008
Total revenue	$	148,887	$	125,366	$	119,255		$	58,960	$	36,789	$	30,894		$	16,692	$	1,725		$	538,568
Property operating expenses, real estate taxes and third party management expenses	54,734		48,831		45,135			30,564		14,739		13,034			9,407		347			216,791
Net operating income	$	94,153	$	76,535	$	74,120		$	28,396	$	22,050	$	17,860		$	7,285	$	1,378		$	321,777
Investment in real estate ventures, at equity	$	5,264	$	13,397	$	24,671		$	6,168	$	1,163	$	65,144		$	—	$	—		$	115,807
Equity in income of real estate ventures	$	1,861	$	466	$	(277	)	$	1,157	$	510	$	58		$	—	$	—		$	3,775

(a) On October 16, 2013seven properties from the Austin portfolio were contributed to a newly formed real estate venture. Accordingly, the Company's 50% interest in the financial results of these seven properties for the period subsequent to October 16, 2013 is reported as a component of 'Equity in income of real estate ventures' in the Company's consolidated statements of operations and, as a result, no longer included as a component of net operating income. The Company acquired Four Points Centre in Austin, TX on December 19, 2013 and the financial results for this property are included in net operating income for the period owned. For additional information, see Notes 3 and 4 to our consolidated financial statements.

Net operating income (“NOI”) is defined as total revenue less property operating expenses, real estate taxes and third party management expenses. Segment NOI includes revenue, real estate taxes and property operating expenses directly related to operation and management of the properties owned and managed within the respective geographical region. Segment NOI excludes property level depreciation and amortization, revenue and expenses directly associated with third party real estate management services, expenses associated with corporate administrative support services, and inter-company eliminations. NOI also does not reflect general and administrative expenses, interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. Trends in development and construction activities that could materially impact the Company’s results from operations are also not reflected in NOI. All companies may not calculate NOI in the same manner. NOI is the measure that is used by the Company to evaluate the operating performance of its real estate assets by segment. The Company also believes that NOI provides useful information to investors regarding its financial condition and results of operations because it reflects only those income and expenses recorded at the property level. The Company believes that net income, as defined by GAAP, is the most appropriate earnings measure. The following is a reconciliation of consolidated NOI to consolidated net income (loss), as defined by GAAP:

	Years Ended December 31,
	2013			2012			2011
Consolidated net operating income	$	340,441		$	324,831		$	321,777
Less:
Interest expense	(121,937		)	(132,939		)	(131,405		)
Interest expense - amortization of deferred financing costs	(4,676		)	(6,208		)	(4,991		)
Interest expense - financing obligation	(972		)	(850		)	—
Depreciation and amortization	(197,021		)	(188,382		)	(202,933		)
General and administrative expenses	(27,628		)	(25,413		)	(24,602		)
Plus:
Interest income	1,044			3,008			1,810
Historic tax credit transaction income	11,853			11,840			12,026
Recognized hedge activity	—			(2,985		)	—
Equity in income of real estate ventures	3,664			2,741			3,775
Net gain from remeasurement of investments in real estate ventures	6,866			—			—
Net gain on sales of interests in real estate	—			—			2,985
Net loss on sale of undepreciated real estate	(137		)	—			—
Net gain (loss) on real estate venture transactions	29,604			(950		)	(222		)
Loss on early extinguishment of debt	(2,119		)	(22,002		)	(2,776		)
Income (loss) from continuing operations	38,982			(37,309		)	(24,556		)
Income from discontinued operations	4,207			43,838			19,841
Net income (loss)	$	43,189		$	6,529		$	(4,715	)

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Commitments and Contingencies (Ground Rent) (Details) (Ground Rent [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Ground Rent [Member]
Minimum future rental payments on non-cancelable leases
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 1,303
Operating Leases, Future Minimum Payments, Due in Two Years	1,303
Operating Leases, Future Minimum Payments, Due in Three Years	1,303
Operating Leases, Future Minimum Payments, Due in Four Years	1,303
Operating Leases, Future Minimum Payments, Due in Five Years	1,303
Operating Leases, Future Minimum Payments, Due Thereafter	57,540
Total	$ 64,055

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Summary of Significant Accounting Policies (Fair Value Measurements) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 767
Available-for-sale Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Available-for-sale Securities [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Interest Rate Swap [Member]
Liabilities:
Interest Rate Swaps	2,188	14,210
Interest Rate Swap [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Liabilities:
Interest Rate Swaps	0	0
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	767
Liabilities:
Interest Rate Swaps	2,188	14,210
Interest Rate Swap [Member] | Unobservable Inputs (Level 3) [Member]
Liabilities:
Interest Rate Swaps	$ 0	$ 0

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2013

Discontinued Operations and Disposal Groups [Abstract]

Revenue and expenses information for the property classified as discontinued operations

	Years ended December 31,
	2013		2012		2011
Revenue:
Rents	$	4,754	$	28,678	$	43,050
Tenant reimbursements	355		2,353		5,030
Termination fees	—		11		75
Other	123		378		110
Total revenue	5,232		31,420		48,265
Expenses:
Property operating expenses	1,839		8,687		13,940
Real estate taxes	649		3,468		5,356
Depreciation and amortization	1,921		10,208		16,178
Total operating expenses	4,409		22,363		35,474
Other income:
Interest income	2		7		3
Income from discontinued operations before gain on sale of interests in real estate	825		9,064		12,794
Net gain on disposition of discontinued operations	3,382		34,774		7,047
Income from discontinued operations	$	4,207	$	43,838	$	19,841

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is involved from time to time in litigation on various matters, including disputes with tenants and disputes arising out of agreements to purchase or sell properties. Given the nature of the Company’s business activities, these lawsuits are considered routine to the conduct of its business. The result of any particular lawsuit cannot be predicted, because of the very nature of litigation, the litigation process and its adversarial nature, and the jury system. The Company will establish reserves for specific legal proceedings when we determine that the likelihood of an unfavorable outcome is probable and when the amount of loss is reasonably estimable. The Company does not expect that the liabilities, if any, that may ultimately result from such legal actions will have a material adverse effect on the consolidated financial position, results of operations or cash flows of the Company.

Letters-of-Credit

Under certain mortgages, the Company has funded required leasing and capital reserve accounts for the benefit of the mortgage lenders with letters-of-credit. There were no associated letters-of-credit at December 31, 2013 and December 31, 2012. Certain of the tenant rents at properties that secure these mortgage loans are deposited into the loan servicer’s depository accounts, which are used to fund debt service, operating expenses, capital expenditures and the escrow and reserve accounts, as necessary. Any excess cash is included in cash and cash equivalents.

Environmental

As an owner of real estate, the Company is subject to various environmental laws of federal, state, and local governments. The Company’s compliance with existing laws has not had a material adverse effect on its financial condition and results of operations, and the Company does not believe it will have a material adverse effect in the future. However, the Company cannot predict the impact of unforeseen environmental contingencies or new or changed laws or regulations on its current Properties or on properties that the Company may acquire.

Ground Rent

Future minimum rental payments under the terms of all non-cancellable ground leases under which the Company is the lessee are expensed on a straight-line basis regardless of when payments are due. The Company’s ground leases have remaining lease terms ranging from 15 to 75 years. Minimum future rental payments on non-cancelable leases at December 31, 2013 are as follows (in thousands):

Year	Minimum Rent
2014	$	1,303
2015	1,303
2016	1,303
2017	1,303
2018	1,303
Thereafter	57,540
Total	64,055

The Company obtained ground tenancy rights related to two properties in Philadelphia, Pennsylvania, which provide for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the properties after certain returns are achieved by the Company. Such amounts, if any, will be reflected as contingent rent when incurred. The leases also provide for payment by the Company of certain operating costs relating to the land, primarily real estate taxes. The above schedule of future minimum rental payments does not include any contingent rent amounts or any reimbursed expenses.

Other Commitments or Contingencies

As part of the Company’s September 2004 acquisition of a portfolio of properties from The Rubenstein Company (which the Company refers to as the "TRC acquisition"), the Company acquired its interest in Two Logan Square, a 708,844 square foot office building in Philadelphia, primarily through its ownership of a second and third mortgage secured by this property. This property is consolidated, as the borrower is a variable interest entity and the Company, through its ownership of the second and third mortgages, is the primary beneficiary. The Company currently does not expect to take title to Two Logan Square until, at the earliest, September 2019. If the Company takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Company has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property an amount equal to $2.9 million. On the TRC acquisition date, the Company recorded a liability of $0.7 million and this amount will accrete up to $2.9 million through September 2019. As of December 31, 2013, the Company had a balance of $1.6 million for this liability in its consolidated balance sheet.

The Company was audited by the Internal Revenue Service (the “IRS”) for its 2004 tax year. The audit concerned the tax treatment of the TRC acquisition in September 2004 in which the Company acquired a portfolio of properties through the acquisition of a limited partnership. On December 17, 2010, the Company received notice that the IRS proposed an adjustment to the allocation of recourse liabilities allocated to the contributor of the properties. The Company appealed the proposed adjustment and during the second quarter of 2013, the IRS finalized a settlement agreement which will not result in a material liability to the Company for federal income taxes. The contributor of partnership interests in the 2004 transaction has agreed not to assert a claim against the Company for federal income tax purposes under the tax protection agreement entered into as part of the transaction.

As part of the Company’s 2006 merger with Prentiss Properties Trust ("Prentiss"), the 2004 TRC acquisition and several of our other transactions, the Company agreed not to sell certain of the properties it acquired in transactions that would trigger taxable income to the former owners. In the case of the TRC acquisition, the Company agreed not to sell acquired properties in non-exempt transactions for periods up to 15 years from the date of the TRC acquisition as follows at December 31, 2013: One Rodney Square and 130/150/170 Radnor Financial Center (January, 2015); and One Logan Square, Two Logan Square and Radnor Corporate Center (January, 2020). In the Prentiss acquisition, the Company assumed the obligation of Prentiss not to sell Concord Airport Plaza before March, 2018. The Company’s agreements generally provide that it may dispose of the subject properties only in transactions that qualify as tax-free exchanges under Section 1031 of the Internal Revenue Code or in other tax deferred transactions. If the Company were to sell a restricted property before expiration of the restricted period in a non-exempt transaction, the Company may be required to make significant payments to the parties who sold the applicable property on account of tax liabilities attributed to them. Similarly, as part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to not sell these two properties in certain taxable transactions prior to October 20, 2013 without the holder’s consent.

As part of the Company’s acquisition of properties from time to time in tax-deferred transactions, the Company has agreed to provide certain of the prior owners of the acquired properties with the right to guarantee the Company’s indebtedness. If the Company were to seek to repay the indebtedness guaranteed by the prior owner before the expiration of the applicable agreement, the Company would be required to provide the prior owner an opportunity to guaranty qualifying replacement debt. These debt maintenance agreements may limit the Company’s ability to refinance indebtedness on terms favorable to the Company. As part of our 2013 acquisition of substantially all of the equity interests in the partnerships that own One and Two Commerce Square, we agreed, for the benefit of affiliates of the holder of the 1% residual ownership interest in these properties, to maintain qualifying mortgage debt through October 20, 2021, in the amounts of not less than $130.0 million on One Commerce Square and $107.9 million on Two Commerce Square. Similarly, we have agreements in place with other contributors of assets to us that obligate us to maintain debt available for then to guaranty.

During 2008, in connection with the development of the IRS Philadelphia Campus and the Cira South Garage, the Company entered into a historic tax credit and a new market tax credit arrangement, respectively. The Company is required to be in compliance with various laws, regulations and contractual provisions that apply to its historic and new market tax credit arrangements. Non-compliance with applicable requirements could result in projected tax benefits not being realized and require a refund to USB or reduction of investor capital contributions, which are reported as deferred income in the Company’s consolidated balance sheet, until such time as its obligation to deliver tax benefits is relieved. The compliance periods for the tax credit arrangements run through 2015. The Company does not anticipate that any material refunds or reductions of investor capital contributions will be required in connection with these arrangements.

The Company invests in its properties and regularly incurs capital expenditures in the ordinary course to maintain the properties. The Company believes that such expenditures enhance its competitiveness. The Company also enters into construction, utility and service contracts in the ordinary course of business which may extend beyond one year. These contracts typically provide for cancellation with insignificant or no cancellation penalties.

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Subsequent Events

12 Months Ended

Dec. 31, 2013

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

The Company has evaluated subsequent events through the date the financial statements were issued.

XML

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 43,189	$ 6,529	$ (4,715)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	198,731	198,579	219,110
Amortization of deferred financing costs	4,676	6,208	4,991
Amortization of debt discount/(premium), net	2,480	1,760	1,567
Amortization of stock compensation costs	6,998	5,685	5,282
Share-based compensation expense relating to awards withheld for employee taxes upon vesting of share awards	(1,062)	(2,493)	(1,012)
Recognized hedge activity	0	2,985	0
Straight-line rent income	(20,136)	(23,566)	(20,298)
Amortization of above (below) Market Leases, Net	(7,170)	(6,084)	(5,384)
Straight-line ground rent expense	1,509	1,897	1,924
Provision for doubtful accounts	2,467	2,198	1,924
Net gain on sale of interests in real estate	(29,166)	(34,774)	(10,008)
Loss on real estate venture formation	0	950	222
Net gain from remeasurement of investments in real estate ventures	6,866	0	0
Net gain on real estate venture transactions	(3,683)	0	0
Loss on early extinguishment of debt	2,119	22,002	2,776
Historic tax credit transaction income	(11,853)	(11,840)	(12,026)
Real estate venture income in excess of distributions	(2,014)	(1,517)	(1,175)
Cumulative interest accretion of repayments of unsecured notes	0	0	(4,005)
Contributions from historic tax credit transaction, net of deferred costs	0	0	2,694
Deferred financing obligation	(974)	(1,803)	0
Changes in assets and liabilities:
Accounts receivable	(4,048)	262	(856)
Other assets	5,440	4,244	(3,851)
Accounts payable and accrued expenses	(526)	(8,355)	7,732
Deferred income, gains and rent	3,758	(2,167)	(7,220)
Other liabilities	(385)	(1,590)	(425)
Net cash from operating activities	183,484	159,110	177,247
Cash flows from investing activities:
Acquisition of properties	(161,604)	(77,555)	(40,674)
Investments in Available-for-sale Securities, Debt	0	(105,250)	0
Proceeds from the sale of available-for-sale securities	0	105,250	0
Sales of properties, net	423,480	170,918	155,956
Distribution of sales proceeds of real estate ventures	16,963	0	0
Proceeds from repayment of mortgage notes receivable	200	23,364	0
Capital expenditures for tenant improvements	(109,357)	(86,986)	(130,482)
Capital expenditures for redevelopments	(6,265)	(11,964)	(674)
Capital expenditures for developments	(5,490)	(162)	0
Payments for (Proceeds from) Other Investing Activities	1,976	0	0
Advances for purchase of tenant assets, net of repayments	(127)	270	1,365
Loan proceeds from an unconsolidated Real Estate Venture partner	0	566	1,388
Loan provided to unconsolidated Real Estate Venture partner	0	0	(1,122)
Investment in unconsolidated Real Estate Ventures	(33,069)	(65,354)	(5,277)
Increase (Decrease) in Restricted Cash	1,902	(1,827)	1,502
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	7,496	5,109	10,316
Leasing costs	(31,397)	(31,243)	(38,461)
Net cash from (used in) investing activities	104,708	(74,864)	(46,163)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	0	600,000	0
Proceeds from Credit Facility	186,000	90,500	706,002
Repayments of Credit Facility	(255,000)	(297,000)	(613,502)
Repayments of mortgage notes payable	(11,268)	(68,513)	(221,856)
Proceeds from unsecured notes	0	248,183	321,448
Deferred financing obligation interest expense	0	935	0
Net Proceeds from Issuance of Common Stock	181,527	0	7,930
Net Proceeds from Issuance of Preferred Stock and Preference Stock	0	96,237	0
Redemption of preferred units	0	(108,536)	0
Cash used in redemption of partnership units	0	(9,676)	0
Repayments from unsecured notes	(31,369)	(338,097)	(105,381)
Repayments of unsecured term loan	0	(190,485)	(145,500)
Net settlement of hedge transactions	0	0	(613)
Debt financing costs	(355)	(10,128)	(4,249)
Exercise of stock options	2,381	976	350
Distributions paid to shareholders/unitholders	(97,367)	(96,030)	(89,559)
Distributions to noncontrolling interest	(1,083)	(1,473)	(2,309)
Net cash from (used in) financing activities	(26,534)	(83,107)	(147,239)
Increase (decrease) in cash and cash equivalents	261,658	1,139	(16,155)
Cash and cash equivalents at beginning of period	1,549	410	16,565
Cash and cash equivalents at end of period	263,207	1,549	410
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2013, 2012, and 2011 of $3,137, $2,560, and $1,997, respectively	118,714	137,823	135,210
Supplemental disclosure of non-cash activity:
Change in operating real estate related to a non-cash acquisition of an operating property	(21,649)	0	0
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,517)	0	0
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	462	0	0
Change in investments in joint venture related to non-cash acquisition of property	13,040	0	0
Change in investments in joint venture related to non-cash disposition of property	(17,628)	0	0
Change in operating real estate related to non-cash adjustment to land	7,752	0	0
Change in mortgage notes payable related to acquisition of an operating property	238,082	0	0
Change in investments in joint venture related to a contribution of land at period end	(6,058)	(15,222)	0
Change in investments in joint venture related to a contribution of services	0	(711)	0
Change in capital expenditures financed through accounts payable at period end	11,703	7,059	(3,896)
Change in capital expenditures financed through retention payable at period end	(204)	566	(6,213)
Change in unfunded tenant allowance	(969)	(1,089)	(1,717)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income (loss)	43,189	6,529	(4,715)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	198,731	198,579	219,110
Amortization of deferred financing costs	4,676	6,208	4,991
Amortization of debt discount/(premium), net	2,480	1,760	1,567
Amortization of stock compensation costs	6,998	5,685	5,282
Share-based compensation expense relating to awards withheld for employee taxes upon vesting of share awards	(1,062)	(2,493)	(1,012)
Recognized hedge activity	0	2,985	0
Straight-line rent income	(20,136)	(23,566)	(20,298)
Amortization of above (below) Market Leases, Net	(7,170)	(6,084)	(5,384)
Straight-line ground rent expense	1,509	1,897	1,924
Provision for doubtful accounts	2,467	2,198	1,924
Net gain on sale of interests in real estate	(29,166)	(34,774)	(10,008)
Loss on real estate venture formation	0	950	222
Net gain from remeasurement of investments in real estate ventures	6,866	0	0
Net gain on real estate venture transactions	(3,683)	0	0
Loss on early extinguishment of debt	2,119	22,002	2,776
Historic tax credit transaction income	(11,853)	(11,840)	(12,026)
Real estate venture income in excess of distributions	(2,014)	(1,517)	(1,175)
Cumulative interest accretion of repayments of unsecured notes	0	0	(4,005)
Contributions from historic tax credit transaction, net of deferred costs	0	0	2,694
Deferred financing obligation	(974)	(1,803)	0
Changes in assets and liabilities:
Accounts receivable	(4,048)	262	(856)
Other assets	5,440	4,244	(3,851)
Accounts payable and accrued expenses	(526)	(8,355)	7,732
Deferred income, gains and rent	3,758	(2,167)	(7,220)
Other liabilities	(385)	(1,590)	(425)
Net cash from operating activities	183,484	159,110	177,247
Cash flows from investing activities:
Acquisition of properties	(161,604)	(77,555)	(40,674)
Investments in Available-for-sale Securities, Debt	0	(105,250)	0
Proceeds from the sale of available-for-sale securities	0	105,250	0
Sales of properties, net	423,480	170,918	155,956
Distribution of sales proceeds of real estate ventures	16,963	0
Proceeds from repayment of mortgage notes receivable	200	23,364	0
Capital expenditures for tenant improvements	(109,357)	(86,986)	(130,482)
Capital expenditures for redevelopments	(6,265)	(11,964)	(674)
Capital expenditures for developments	(5,490)	(162)	0
Payments for (Proceeds from) Other Investing Activities	1,976	0
Advances for purchase of tenant assets, net of repayments	(127)	270	1,365
Loan proceeds from an unconsolidated Real Estate Venture partner	0	566	1,388
Loan provided to unconsolidated Real Estate Venture partner	0	0	(1,122)
Investment in unconsolidated Real Estate Ventures	(33,069)	(65,354)	(5,277)
Increase (Decrease) in Restricted Cash	1,902	(1,827)	1,502
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	7,496	5,109	10,316
Leasing costs	(31,397)	(31,243)	(38,461)
Net cash from (used in) investing activities	104,708	(74,864)	(46,163)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	0	600,000	0
Proceeds from Credit Facility	186,000	90,500	706,002
Repayments of Credit Facility	(255,000)	(297,000)	(613,502)
Repayments of mortgage notes payable	(11,268)	(68,513)	(221,856)
Proceeds from unsecured notes	0	248,183	321,448
Deferred financing obligation interest expense	0	935	0
Net Proceeds from Issuance of Common Stock	181,527	0	7,930
Net Proceeds from Issuance of Preferred Stock and Preference Stock	0	96,237	0
Redemption of preferred units	0	(108,536)	0
Cash used in redemption of partnership units	0	(9,676)	0
Repayments from unsecured notes	(31,369)	(338,097)	(105,381)
Repayments of unsecured term loan	0	(190,485)	(145,500)
Net settlement of hedge transactions	0	0	(613)
Debt financing costs	(355)	(10,128)	(4,249)
Refund Of Deferred Financing Costs Related To Forward Commitment	0	0	0
Exercise of stock options	2,381	976	350
Distributions paid to shareholders/unitholders	(98,450)	(97,503)	(91,868)
Net cash from (used in) financing activities	(26,534)	(83,107)	(147,239)
Increase (decrease) in cash and cash equivalents	261,658	1,139	(16,155)
Cash and cash equivalents at beginning of period	1,549	410	16,565
Cash and cash equivalents at end of period	263,207	1,549	410
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2013, 2012, and 2011 of $3,137, $2,560, and $1,997, respectively	118,714	137,823	135,210
Supplemental disclosure of non-cash activity:
Change in operating real estate related to a non-cash acquisition of an operating property	(21,649)	0
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,517)	0
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	462	0
Change in investments in joint venture related to non-cash acquisition of property	13,040	0
Change in investments in joint venture related to non-cash disposition of property	(17,628)	0
Change in operating real estate related to non-cash adjustment to land	7,752	0
Change in mortgage notes payable related to acquisition of an operating property	238,082	0	0
Change in investments in joint venture related to a contribution of land at period end	(6,058)	(15,222)
Change in investments in joint venture related to a contribution of services	0
Change in capital expenditures financed through accounts payable at period end	11,703	7,059	(3,896)
Change in capital expenditures financed through retention payable at period end	(204)	566	(6,213)
Change in unfunded tenant allowance	$ (969)	$ (1,089)	$ (1,717)

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Summary of Quarterly Results

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

SUMMARY OF QUARTERLY RESULTS (UNAUDITED)

The following is a summary of quarterly financial information as of and for the years ended December 31, 2013 and 2012 (in thousands, except per share data):

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (a)
2013
Total revenue	$	139,554	$	140,644	$	143,354	$	138,658
Net income (loss)	3,919		7,180		11,088		21,002
Net income (loss) allocated to Common Shares	2,058		5,308		9,173		18,975
Basic earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
Diluted earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
2012
Total revenue	$	133,516	$	131,530	$	134,238	$	136,395
Net income (loss)	9,336		6,802		17,089		(26,698		)
Net income (loss) allocated to Common Shares	7,108		1,537		13,949		(30,832		)
Basic earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)
Diluted earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)

(a) The consolidated statement of operations for the fourth quarter of 2012 also contained an out of period deferred compensation expense adjustment of $0.6 million relating to the acceleration of deferred compensation for certain of our executive personnel who reached qualifying retirement conditions that should have been expensed in prior periods (please see Note 14 for further discussion regarding the qualifying retirement conditions). This resulted in an overstatement of expense by $0.6 million in the fourth quarter of 2012, and an understatement of expense by $0.2 million, $0.3 million, and a nominal amount in the third, second, and first quarters of 2012, respectively, and $0.1 million in the year-ended December 31, 2011. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment in the current year.

The summation of quarterly earnings per share amounts do not necessarily equal the full year amounts due to rounding. The above information was updated to reclassify amounts previously reported to reflect discontinued operations. See Note 2 and Note 10.

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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations									$ 4,207	$ 43,838	$ 19,841
Revenue:
Rents									461,387	437,560	441,329
Tenant Reimbursements									79,087	77,060	77,404
Termination Fees									4,497	3,233	2,951
Other									4,186	5,710	5,348
Total revenue	138,658	143,354	140,644	139,554	136,395	134,238	131,530	133,516	562,210	535,679	538,568
Expenses:
Property operating expenses									160,406	152,319	159,768
Real estate taxes									55,612	53,402	51,433
Depreciation and amortization									197,021	188,382	202,933
Total operating expenses									446,418	424,643	444,326
Investment Income, Interest									1,044	3,008	1,810
Income from discontinued operations before gain on sale of interests in real estate									825	9,064	12,794
Net gain (loss) on disposition of discontinued operations									3,382	34,774	7,047
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations									4,207	43,838	19,841
Revenue:
Rents									4,754	28,678	43,050
Tenant Reimbursements									355	2,353	5,030
Termination Fees									0	11	75
Other									123	378	110
Total revenue									5,232	31,420	48,265
Expenses:
Property operating expenses									1,839	8,687	13,940
Real estate taxes									649	3,468	5,356
Depreciation and amortization									1,921	10,208	16,178
Total operating expenses									4,409	22,363	35,474
Investment Income, Interest									2	7	3
Income from discontinued operations before gain on sale of interests in real estate									825	9,064	12,794
Net gain (loss) on disposition of discontinued operations									$ 3,382	$ 34,774	$ 7,047
Net Rentable Space Sold	2,300,000								2,300,000
Number of properties sold (in properties)										32

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

	December 31, 2013
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	150,782	$	(35,607	)	$	115,175
Tenant relationship value	38,692		(26,868		)	11,824
Above market leases acquired	6,673		(1,343		)	5,330
Total	$	196,147	$	(63,818	)	$	132,329
Below market leases acquired	$	81,991	$	(47,547	)	$	34,444

	December 31, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	87,909	$	(42,894	)	$	45,015
Tenant relationship value	56,137		(37,389		)	18,748
Above market leases acquired	8,565		(1,708		)	6,857
Total	$	152,611	$	(81,991	)	$	70,620
Below market leases acquired	$	77,083	$	(43,224	)	$	33,859

Annual amortization of intangible assets and liabilities

	Assets		Liabilities
2014	$	27,043	$	7,614
2015	23,314		5,455
2016	18,573		3,486
2017	16,573		2,890
2018	12,161		2,353
Thereafter	34,665		12,646
Total	$	132,329	$	34,444

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Summary of Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (a)
2013
Total revenue	$	139,554	$	140,644	$	143,354	$	138,658
Net income (loss)	3,919		7,180		11,088		21,002
Net income (loss) allocated to Common Shares	2,058		5,308		9,173		18,975
Basic earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
Diluted earnings (loss) per Common Share	$	0.01	$	0.03	$	0.06	$	0.12
2012
Total revenue	$	133,516	$	131,530	$	134,238	$	136,395
Net income (loss)	9,336		6,802		17,089		(26,698		)
Net income (loss) allocated to Common Shares	7,108		1,537		13,949		(30,832		)
Basic earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)
Diluted earnings (loss) per Common Share	$	0.05	$	0.01	$	0.10	$	(0.21	)

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Deferred Costs (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Costs (Textuals) [Abstract]
Capitalized internal direct leasing costs	$ 7.5	$ 7.5	$ 6.6

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Rents	$ 461,387	$ 437,560	$ 441,329
Tenant reimbursements	79,087	77,060	77,404
Termination Fees	4,497	3,233	2,951
Third party management fees, labor reimbursement and leasing	13,053	12,116	11,536
Other	4,186	5,710	5,348
Total revenue	562,210	535,679	538,568
Operating Expenses:
Property operating expenses	160,406	152,319	159,768
Real estate taxes	55,612	53,402	51,433
Third party management expenses	5,751	5,127	5,590
Depreciation and amortization	197,021	188,382	202,933
General and administrative expenses	27,628	25,413	24,602
Total operating expenses	446,418	424,643	444,326
Operating income	115,792	111,036	94,242
Other Income (Expense):
Interest income	1,044	3,008	1,810
Historic tax credit transaction income	11,853	11,840	12,026
Interest expense	(121,937)	(132,939)	(131,405)
Interest expense - amortization of deferred financing costs	(4,676)	(6,208)	(4,991)
Interest expense — financing obligation	(972)	(850)	0
Recognized hedge activity	0	(2,985)	0
Equity in income of real estate ventures	3,664	2,741	3,775
Net gain from remeasurement of investments in real estate ventures	6,866	0	0
Net gain on sale of interests in real estate	0	0	2,985
Net gain (loss) on sale of undepreciated real estate	(137)	0	0
Net gain (loss) on real estate venture transactions	29,604	(950)	(222)
Gain (loss) on early extinguishment of debt	(2,119)	(22,002)	(2,776)
Income (loss) from continuing operations	38,982	(37,309)	(24,556)
Discontinued operations:
Income from discontinued operations	825	9,064	12,794
Net gain (loss) on disposition of discontinued operations	3,382	34,774	7,047
Total discontinued operations	4,207	43,838	19,841
Net income (loss)	43,189	6,529	(4,715)
Net income from discontinued operations attributable to non-controlling interests - LP units	(55)	(797)	(778)
Net (income) loss attributable to non-controlling interests — LP units	357	(863)	(994)
Net (income) loss attributable to non-controlling interests	(412)	66	216
Net income (loss)	42,777	6,595	(4,499)
Distribution to Preferred Shares	(6,900)	(10,405)	(7,992)
Preferred share/unit redemption charge	0	(4,052)	0
Amount allocated to unvested restricted shareholders	(363)	(376)	(505)
Net income (loss) attributable to Common Shareholders/Unitholders	35,514	(8,238)	(12,996)
Basic income (loss) per Common Share/Unit:
Continuing operations (in dollars per share)	$ 0.20	$ (0.36)	$ (0.24)
Discontinued operations (in dollars per share)	$ 0.03	$ 0.30	$ 0.14
Basic income (loss) per Common Share (in dollars per share)	$ 0.23	$ (0.06)	$ (0.10)
Diluted income (loss) per Common Share/Unit:
Continuing operations (in dollars per share)	$ 0.20	$ (0.36)	$ (0.24)
Discontinued operations (in dollars per share)	$ 0.03	$ 0.30	$ 0.14
Diluted income (loss) per Common Share/Unit (in dollars per share)	$ 0.23	$ (0.06)	$ (0.10)
Basic weighted average shares outstanding (in shares)	153,140,458	143,257,097	135,444,424
Diluted weighted average shares outstanding (in shares)	154,414,311	143,257,097	135,444,424
Net income (loss)
Income (loss) from continuing operations	38,625	(36,446)	(23,562)
Income (loss) from discontinued operations	4,152	43,041	19,063
Net income (loss)	42,777	6,595	(4,499)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue:
Rents	461,387	437,560	441,329
Tenant reimbursements	79,087	77,060	77,404
Termination Fees	4,497	3,233	2,951
Third party management fees, labor reimbursement and leasing	13,053	12,116	11,536
Other	4,186	5,710	5,348
Total revenue	562,210	535,679	538,568
Operating Expenses:
Property operating expenses	160,406	152,319	159,768
Real estate taxes	55,612	53,402	51,433
Third party management expenses	5,751	5,127	5,590
Depreciation and amortization	197,021	188,382	202,933
General and administrative expenses	27,628	25,413	24,602
Total operating expenses	446,418	424,643	444,326
Operating income	115,792	111,036	94,242
Other Income (Expense):
Interest income	1,044	3,008	1,810
Historic tax credit transaction income	11,853	11,840	12,026
Interest expense	(121,937)	(132,939)	(131,405)
Interest expense - amortization of deferred financing costs	(4,676)	(6,208)	(4,991)
Interest expense — financing obligation	(972)	(850)	0
Recognized hedge activity	0	(2,985)	0
Equity in income of real estate ventures	3,664	2,741	3,775
Net gain from remeasurement of investments in real estate ventures	6,866	0	0
Net gain on sale of interests in real estate	0	0	2,985
Net gain (loss) on sale of undepreciated real estate	(137)	0	0
Net gain (loss) on real estate venture transactions	29,604	(950)	(222)
Gain (loss) on early extinguishment of debt	(2,119)	(22,002)	(2,776)
Income (loss) from continuing operations	38,982	(37,309)	(24,556)
Discontinued operations:
Income from discontinued operations	825	9,064	12,794
Net gain (loss) on disposition of discontinued operations	3,382	34,774	7,047
Total discontinued operations	4,207	43,838	19,841
Net income (loss)	43,189	6,529	(4,715)
Net income (loss)	43,189	6,529	(4,715)
Distribution to Preferred Shares	(6,900)	(10,405)	(7,992)
Preferred share/unit redemption charge	0	(4,052)	0
Amount allocated to unvested restricted shareholders	(363)	(376)	(505)
Net income (loss) attributable to Common Shareholders/Unitholders	35,926	(8,304)	(13,212)
Basic income (loss) per Common Share/Unit:
Continuing operations (in dollars per share)	$ 0.20	$ (0.36)	$ (0.23)
Discontinued operations (in dollars per share)	$ 0.03	$ 0.30	$ 0.14
Basic income (loss) per Common Share (in dollars per share)	$ 0.23	$ (0.06)	$ (0.09)
Diluted income (loss) per Common Share/Unit:
Continuing operations (in dollars per share)	$ 0.20	$ (0.36)	$ (0.23)
Discontinued operations (in dollars per share)	$ 0.03	$ 0.30	$ 0.14
Diluted income (loss) per Common Share/Unit (in dollars per share)	$ 0.23	$ (0.06)	$ (0.09)
Basic weighted average shares outstanding (in shares)	154,929,545	145,883,217	145,118,841
Diluted weighted average shares outstanding (in shares)	156,203,398	145,883,217	145,118,841
Net income (loss)
Income (loss) from continuing operations	38,982	(37,309)	(24,556)
Income (loss) from discontinued operations	4,207	43,838	19,841
Net income (loss)	$ 43,189	$ 6,529	$ (4,715)

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Beneficiaries Equity of The Parent Company (Tables)

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Earnings per Share (EPS)

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Net (income) loss from continuing operations attributable to non-controlling interests	(357		)	(357		)	863			863			994			994
Amount allocable to unvested restricted shareholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred share dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred share redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common shareholders	31,362			31,362			(51,279		)	(51,279		)	(32,059		)	(32,059		)
Income from discontinued operations	4,207			4,207			43,838			43,838			19,841			19,841
Discontinued operations attributable to non-controlling interests	(55		)	(55		)	(797		)	(797		)	(778		)	(778		)
Discontinued operations attributable to common shareholders	4,152			4,152			43,041			43,041			19,063			19,063
Net income (loss) attributable to common shareholders	$	35,514		$	35,514		$	(8,238	)	$	(8,238	)	$	(12,996	)	$	(12,996	)
Denominator
Weighted-average shares outstanding	153,140,458			153,140,458			143,257,097			143,257,097			135,444,424			135,444,424
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average shares outstanding	153,140,458			154,414,311			143,257,097			143,257,097			135,444,424			135,444,424
Earnings per Common Share:
Income (loss) from continuing operations attributable to common shareholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.24	)	$	(0.24	)
Discontinued operations attributable to common shareholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common shareholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 Reportable_Segments	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Pennsylvania Suburbs [Member]	Dec. 31, 2012 Pennsylvania Suburbs [Member]	Dec. 31, 2011 Pennsylvania Suburbs [Member]	Dec. 31, 2013 Philadelphia CBD [Member]	Dec. 31, 2012 Philadelphia CBD [Member]	Dec. 31, 2011 Philadelphia CBD [Member]	Dec. 31, 2013 Metropolitan, D.C. [Member]	Dec. 31, 2012 Metropolitan, D.C. [Member]	Dec. 31, 2011 Metropolitan, D.C. [Member]	Dec. 31, 2013 New Jersey/ Delaware [Member]	Dec. 31, 2012 New Jersey/ Delaware [Member]	Dec. 31, 2011 New Jersey/ Delaware [Member]	Dec. 31, 2013 Richmond, Virginia [Member]	Dec. 31, 2012 Richmond, Virginia [Member]	Dec. 31, 2011 Richmond, Virginia [Member]	Dec. 31, 2013 Austin, Texas [Member]	Dec. 31, 2012 Austin, Texas [Member]	Dec. 31, 2011 Austin, Texas [Member]	Dec. 31, 2013 California [Member]	Dec. 31, 2012 California [Member]	Dec. 31, 2011 California [Member]	Dec. 31, 2013 Corporate [Member]	Dec. 31, 2012 Corporate [Member]	Dec. 31, 2011 Corporate [Member]	Dec. 31, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2013 Austin Joint Venture [Member]	Oct. 16, 2013 Brandywine Realty Trust [Member] Austin Joint Venture [Member] Properties
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage																																							50.00%	50.00%
Number of reportable segments									7
Real estate investments, at cost:
Operating properties	$ 4,669,289				$ 4,726,169				$ 4,669,289	$ 4,726,169	$ 4,793,080	$ 1,199,105	$ 1,178,730	$ 1,218,071	$ 1,300,666	$ 988,590	$ 953,870	$ 1,214,965	$ 1,193,200	$ 1,255,803	$ 414,716	$ 546,644	$ 545,657	$ 310,397	$ 309,923	$ 307,698	$ 36,856	$ 285,346	$ 257,694	$ 192,584	$ 223,736	$ 254,287	$ 0	$ 0	$ 0	$ 4,669,289	$ 4,726,169
Construction-in-progress	74,174				48,950				74,174	48,950	25,083																						74,174	48,950	25,083	74,174	48,950
Land inventory	93,351				102,439				93,351	102,439	109,008																						93,351	102,439	109,008	93,351	102,439
Total revenue	138,658	143,354	140,644	139,554	136,395	134,238	131,530	133,516	562,210	535,679	538,568	153,426	150,075	148,887	146,081	131,592	125,366	116,048	107,656	119,255	60,262	59,671	58,960	35,058	35,701	36,789	31,451	32,379	30,894	18,369	17,463	16,692	1,515	1,142	1,725	562,210	535,679	538,568
Property operating expenses, real estate taxes and third party management expenses									221,769	210,848	216,791	54,506	52,657	54,734	55,702	50,787	48,831	42,641	41,485	45,135	29,981	28,506	30,564	14,916	14,484	14,739	13,298	13,951	13,034	9,411	9,043	9,407	1,314	(65)	347
Net operating income									340,441	324,831	321,777	98,920	97,418	94,153	90,379	80,805	76,535	73,407	66,171	74,120	30,281	31,165	28,396	20,142	21,217	22,050	18,153	18,428	17,860	8,958	8,420	7,285	201	1,207	1,378
Equity Method Investments	180,512				193,555				180,512	193,555	115,807	17,272	33,160	5,264	19,975	27,859	13,397	59,905	49,169	24,671	0	17,294	6,168	1,400	1,245	1,163	81,960	64,828	65,144	0	0	0	0	0	0	180,512	193,555		17,262
Equity in income of real estate ventures									$ 3,664	$ 2,741	$ 3,775	$ 925	$ 520	$ 1,861	$ 1,547	$ 1,113	$ 466	$ 130	$ (648)	$ (277)	$ 1,245	$ 1,803	$ 1,157	$ 381	$ 269	$ 510	$ (564)	$ (316)	$ 58	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 3,664	$ 2,741	$ 3,775	$ (434)
Number of properties contributed to a joint venture																																								7

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Consolidated Statements of Beneficiaries' Equity (USD $) In Thousands, except Share data	Total	Series E Preferred Stock [Member]	Common Stock	Treasury Stock	Deferred Compensation Payable in Common Shares	Common Shares in Grantor Trust	Additional Paid-in Capital	Cumulative Earnings	Accumulated Other Comprehensive Income (Loss)	Cumulative Distributions	Non-Controlling Interests	Subsidiaries [Member]	Subsidiaries [Member] Series E Preferred Stock [Member]	Subsidiaries [Member] Accumulated Other Comprehensive Income (Loss)	Subsidiaries [Member] Non-Controlling Interests	Subsidiaries [Member] Series D Preferred Stock [Member]	Subsidiaries [Member] Total partners equity [Member]	Subsidiaries [Member] Series E-linked Preferred Stock [Member]
Beginning Balance at Dec. 31, 2010	$ 1,977,774	$ 43	$ 1,343	$ (3,074)	$ 5,774	$ (5,774)	$ 2,671,217	$ 483,439	$ (1,945)	$ (1,301,521)	$ 128,272		$ 55,538	$ (2,080)	$ 0	$ 47,912	$ 1,844,919	$ 0
Beginning Balance, shares at Dec. 31, 2010		4,300,000	134,601,796	116,679	291,281								2,300,000			2,000,000		0
Net income (loss)	(4,715)							(4,500)			(215)	(4,715)					(4,715)
Comprehensive income (loss)	(4,346)								(4,134)		(212)	(4,346)		(4,346)			(4,346)
Issuance of Common Shares of Beneficial Interest, shares			679,285
Issuance of Common Shares of Beneficial Interest	8,272		7				8,265
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(377)						(345)				(32)
Conversion of LP Units to Common Shares	0		72				85,966				(86,038)						86,038
Conversion of LP Units to Common Shares, shares			7,204,104
Bonus Share Issuance, shares				(463)	463
Bonus Share Issuance	6			12	6	(6)		(6)									6
Vesting of Restricted Shares, shares			85,248	(116,216)	9,043
Vesting of Restricted Shares, Value	(350)		1	3,062			(1,818)	(1,595)									(352)
Restricted Share Amortization	2,937						2,937										2,937
Restricted Performance Units Amortization	1,679						1,679										1,679
Exercise of Stock Options, shares			120,179
Exercise of Stock Options	350		1				349										350
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition							1,487
Share Issuance from/to Deferred Compensation Plan, shares			(845)		(8,141)
Share Issuance from/to Deferred Compensation Plan	(16)				(149)	149	(16)
Share Option Amortization	1,487																1,487
Outperformance Plan Amortization	123						123										123
Share Choice Plan Issuance Value	(55)						(55)										(55)
Share Choice Plan Issuance Shares			(1,684)
Stock Issued During Period, Shares, Other			2,672
Stock Issued During Period, Value, Other	32						32
Adjustment to Non-controlling Interest	0						6,376				(6,376)
Preferred Share distributions	(7,992)									(7,992)							(7,992)
Preferred share/unit redemption charge	0											0
Distributions declared ($0.60) per share in each of 2013, 2012, and 2011	(85,113)									(82,819)	(2,294)
Ending Balance at Dec. 31, 2011	1,889,696	43	1,424	0	5,631	(5,631)	2,776,197	477,338	(6,079)	(1,392,332)	33,105		55,538	(6,426)	0	47,912	1,851,326	0
Ending Balance, shares at Dec. 31, 2011		4,300,000	142,690,755	0	292,646								2,300,000			2,000,000		0
Net income (loss)	6,529							6,595			(66)	6,529					6,529
Comprehensive income (loss)	(10,026)								(9,839)		(187)	(10,026)		(10,026)			(10,026)
Issuance of Common Shares of Beneficial Interest, shares		4,000,000
Issuance of Common Shares of Beneficial Interest	96,850	40					96,810
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(613)						(613)										(613)
Conversion of LP Units to Common Shares	(167)		1				149	(49)			(268)						(49)
Conversion of LP Units to Common Shares, shares			20,464
Preferred Stock, Shares Issued	4,000,000											4,000,000						4,000,000
Redemption of preferred shares, Shares		(4,300,000)											(2,300,000)			(2,000,000)
Redemption of preferred shares, Value	(103,448)	(43)					(103,405)						55,538			47,912	103,450
Bonus Share Issuance, shares			35,703
Bonus Share Issuance	387						387										387
Partners' Capital Account, Redemptions	(9,741)							(4,185)			(5,556)						9,741
Vesting of Restricted Shares, shares			293,614		9,036
Vesting of Restricted Shares, Value	(1,385)		4				(1,389)										(1,385)
Restricted Share Amortization	3,271						3,271										3,271
Stock Issued During Period, Shares, Vesting of restricted performance units			272,131
Stock Issued During Period, Value, Vesting of restricted performance units	(1,495)		3				(1,498)										(1,495)
Restricted Performance Units Amortization	3,379						3,379										3,379
Restricted Stock Award, Forfeitures	35							35									(35)
Exercise of Stock Options, shares			230,294
Exercise of Stock Options	976		2				974										976
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition							1,636
Share Issuance from/to Deferred Compensation Plan, shares			(5,564)		(10,937)
Share Issuance from/to Deferred Compensation Plan	0				(279)	279
Share Option Amortization	1,636																1,636
Stock Issued During Period, Shares, Other			1,336
Stock Issued During Period, Value, Other	15						15
Adjustment to Non-controlling Interest	0						4,281				(4,281)
Preferred Share distributions	(10,405)									(10,405)							(10,405)
Preferred share/unit redemption charge	(4,052)									(4,052)		(4,052)					(4,052)
Distributions declared ($0.60) per share in each of 2013, 2012, and 2011	(87,926)									(86,417)	(1,509)
Ending Balance at Dec. 31, 2012	1,773,516	40	1,434	0	5,352	(5,352)	2,780,194	479,734	(15,918)	(1,493,206)	21,238	1,746,739	0	(16,452)		0	1,746,739	96,850
Ending Balance, shares at Dec. 31, 2012		4,000,000	143,538,733	0	290,745								0			0		4,000,000
Beginning Balance at Sep. 30, 2012
Net income (loss)	(26,698)
Preferred Stock, Shares Issued	4,000,000																	4,000,000
Ending Balance at Dec. 31, 2012	1,773,516		1,434	0	5,352	(5,352)	2,780,194	479,734	(15,918)	(1,493,206)	21,238	1,746,739		(16,452)	0		1,746,739	96,850
Ending Balance, shares at Dec. 31, 2012			143,538,733	0	290,745													4,000,000
Net income (loss)	43,189							42,777			412	43,189					43,189
Comprehensive income (loss)	13,075								12,923		152	13,075		13,075			13,075
Issuance of Common Shares of Beneficial Interest, shares			12,650,000
Issuance of Common Shares of Beneficial Interest	182,034		127				181,907
Noncontrolling Interest, Increase from Business Combination	946										946				(946)		(946)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(744)						(744)
Conversion of LP Units to Common Shares	0		1				1,239				(1,240)						1,240
Conversion of LP Units to Common Shares, shares			81,998
Preferred Stock, Shares Issued	4,000,000											4,000,000
Redemption of preferred shares, Value																	(361)
Bonus Share Issuance, shares			27,918
Bonus Share Issuance	361						361										(902)
Partners' Capital Account, Redemptions																	(17)
Vesting of Restricted Shares, shares			147,495		7,050
Vesting of Restricted Shares, Value	(902)		2				(904)
Restricted Share Amortization	3,079						3,079										3,079
Stock Issued During Period, Shares, Vesting of restricted performance units			53,134		27,067
Stock Issued During Period, Value, Vesting of restricted performance units	(159)		1				(160)
Restricted Performance Units Amortization	4,333						4,333										4,333
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	(17)							17
Exercise of Stock Options, shares	236,318		236,318
Exercise of Stock Options	2,380		1				2,379										2,380
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition							670
Share Issuance from/to Deferred Compensation Plan, shares			(5,012)		(12,583)
Share Issuance from/to Deferred Compensation Plan	0				55	(55)
Share Option Amortization	670																670
Share Choice Plan Issuance Value																	(160)
Stock Issued During Period, Shares, Other			1,409
Stock Issued During Period, Value, Other	20						20
Adjustment to Non-controlling Interest	0						(778)				778
Preferred Share distributions	(6,900)									(6,900)							6,900
Preferred share/unit redemption charge	0											0
Distributions declared ($0.60) per share in each of 2013, 2012, and 2011	(93,480)									(92,409)	(1,071)
Ending Balance at Dec. 31, 2013	$ 1,921,435	$ 40	$ 1,566		$ 5,407	$ (5,407)	$ 2,971,596	$ 522,528	$ (2,995)	$ (1,592,515)	$ 21,215	$ 1,894,949	$ 0	$ (3,377)	$ 946	$ 0	$ 1,894,949	$ 96,850
Ending Balance, shares at Dec. 31, 2013		4,000,000	156,731,993		312,279								0			0		4,000,000

XML

Tax Credit Transactions (Details) (USD $)	12 Months Ended							12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Historic Tax Credit Transaction [Member]	Dec. 31, 2012 Historic Tax Credit Transaction [Member]	Dec. 31, 2011 Historic Tax Credit Transaction [Member]	Nov. 17, 2008 Historic Tax Credit Transaction [Member] sqft	Dec. 31, 2013 New Markets Tax Credit Transaction [Member]	Dec. 31, 2013 Brandywine Realty Trust [Member] New Markets Tax Credit Transaction [Member]	Dec. 31, 2012 Brandywine Realty Trust [Member] New Markets Tax Credit Transaction [Member]	Dec. 31, 2013 USB [Member] Historic Tax Credit Transaction [Member]	Dec. 31, 2012 USB [Member] Historic Tax Credit Transaction [Member]	Aug. 27, 2010 USB [Member] Historic Tax Credit Transaction [Member]	Dec. 31, 2013 USB [Member] New Markets Tax Credit Transaction [Member]	Dec. 31, 2012 USB [Member] New Markets Tax Credit Transaction [Member]
Tax Credit Transactions (Textuals) [Abstract]
Area of IRS Philadelphia Campus building (in square foot)							862,692
Percentage of building leased to IRS							100.00%
Agreed contribution in project cost by USB													$ 64,100,000
Amount received in advance for project cost	0	0	2,694,000
Tax credit conditions				20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus				100% recapture for a period of seven years as provided in the Internal Revenue Code
Percentage of tax credit recapture				20.00%				100.00%
USB contributions presented within deferred income											26,800,000	39,100,000		13,300,000	13,300,000
Contribution allocated in non controlling interest				2,800,000	2,600,000
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period				over the five year credit recapture period as defined in the Internal Revenue Code
Historic tax credit transaction income	(11,853,000)	(11,840,000)	(12,026,000)	11,900,000
Allocated expenses within other income (expense)				500,000							500,000
Deferred transaction costs	122,954,000	122,243,000		1,000,000	1,600,000				5,300,000	5,300,000
Rate of return on noncontrolling interest expected				2.00%
Accretion of non-controlling interest liability				$ 1,400,000	$ 1,300,000	$ 1,300,000
Limit on tax credit claims under the Community Renewal Tax Relief	up to 39% of qualified investments in qualified, active low-income businesses or ventures
Percentage of qualified investments								39.00%
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years				5 years				7 years

XML

Summary of Significant Accounting Policies Schedule of Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Assets [Abstract]
Other Assets	$ 62,377	$ 53,325

XML

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended				12 Months Ended
	Sep. 30, 2004	Dec. 31, 2013 sqft Y	Dec. 31, 2013 One Commerce Square [Member]	Dec. 31, 2013 Two Commerce Square [Member]	Dec. 31, 2013 One and Two Commerce Square [Member]	Dec. 31, 2013 Historic Tax Credit Transaction [Member]	Dec. 31, 2012 Historic Tax Credit Transaction [Member]	Dec. 31, 2011 Historic Tax Credit Transaction [Member]	Dec. 31, 2013 New Markets Tax Credit Transaction [Member]
Long-term Purchase Commitment [Line Items]
Accretion Of Non Controlling Interest Liability						$ 1.4	$ 1.3	$ 1.3
Commitments and Contingencies (Textuals) [Abstract]
Minimum remaining lease period		15
Maximum remaining lease period		75
Leased Area Of Building		708,844
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage		2.9
Liability related to acquisition of TRC	0.7	1.6
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition		15 years
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners					1.00%
Tax guarantee obligation			130.0	107.9
Tax Credit Carryforward, Amount									$ 7.8

XML

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Reclassifications

Reclassifications

Certain amounts have been reclassified in prior years to conform to the current year presentation. The reclassifications are related to the treatment of sold properties as discontinued operations on the statement of operations for all periods presented.

Principles of Consolidation

Principles of Consolidation

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity (“VIE”), and if the Company is deemed to be the primary beneficiary, in accordance with the accounting standard for the consolidation of variable interest entities. The accounting standard for the consolidation of VIEs requires the Company to qualitatively assess if the Company was the primary beneficiary of the VIEs based on whether the Company had (i) the power to direct those matters that most significantly impacted the activities of the VIE and (ii) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. For entities determined to be VIEs, but for which the Company is not the primary beneficiary, the Company's maximum exposure to loss is the carrying amount of its investments. As of December 31, 2013, the Company has provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII.

When an entity is not deemed to be a VIE, the Company considers the provisions of the same accounting standard to determine whether a general partner/managing member, or the general partners/managing members as a group, controls a limited partnership or similar entity when the limited partners/non-managing members have certain rights. The Company consolidates (i) entities that are VIEs and of which the Company is deemed to be the primary beneficiary and (ii) entities that are non-VIEs and controlled by the Company and in which the limited partners neither have the ability to dissolve the entity or remove the Company without cause nor any substantive participating rights.  Entities that the Company accounts for under the equity method (i.e., at cost, increased or decreased by the Company's share of earnings or losses, plus contributions, less distributions) include (i) entities that are VIEs and of which the Company is not deemed to be the primary beneficiary (ii) entities that are non-VIEs which the Company does not control, but over which the Company has the ability to exercise significant influence and (iii) entities that are non-VIEs for which the Company maintains an ownership interest through its general partner/managing member status, but the limited partners/non-managing members in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights.  Currently there are no real estate ventures that a limited partner/non-managing member has the unilateral right to dissolve. The Company continuously assesses its determination of whether an entity is a VIE and who the primary beneficiary is, and whether or not the limited partners/non-managing members in an entity have substantive rights, more particularly if certain events occur that are likely to cause a change in the original determinations. The Company's assessment includes a review of applicable documents such as, but not limited to, applicable partnership agreements, LLC and other real estate venture agreements and management and leasing agreements to determine whether the Company has control to direct the business activities of the entities. The portion of the consolidated entities that is not owned by the Company is presented as non-controlling interest as of and during the periods consolidated. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Management makes significant estimates regarding revenue, valuation of real estate and related intangible assets and liabilities, impairment of long-lived assets, allowance for doubtful accounts and deferred costs.

Operating Properties

Operating Properties

Operating properties are carried at historical cost less accumulated depreciation and impairment losses. The cost of operating properties reflects their purchase price or development cost. Acquisition costs related to business combinations are expensed as incurred, whereas the costs related to asset acquisitions are capitalized as incurred. Costs incurred for the renovation and betterment of an operating property are capitalized to the Company’s investment in that property. 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. Fully-depreciated assets are removed from the accounts.

Purchase Price Allocation

Purchase Price Allocation

The Company allocates the purchase price of properties considered to be business combinations to net tangible and identified intangible assets acquired based on fair values. Above-market and below-market in-place lease values for acquired properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) the Company’s estimate of the fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease (including the below market fixed renewal period, if applicable). Capitalized above-market lease values are amortized as a reduction of rental income over the remaining non-cancelable terms of the respective leases. Capitalized below-market lease values are amortized as an increase to rental income over the remaining non-cancelable terms of the respective leases, including any below market fixed-rate renewal periods.

Other intangible assets also include in-place leases based on the Company’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. The Company estimates the cost to execute leases with terms similar to the remaining lease terms of the in-place leases, including leasing commissions, legal and other related expenses. This intangible asset is amortized to expense over the remaining term of the respective leases and any fixed-rate bargain renewal periods. Company estimates of value are made using methods similar to those used by independent appraisers or by using independent appraisals. Factors considered by the Company in this analysis include an estimate of the carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, which primarily range from four to twelve months. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired. The Company also uses the information obtained as a result of its pre-acquisition due diligence as part of its consideration of the accounting standard governing asset retirement obligations and when necessary, will record a conditional asset retirement obligation as part of its purchase price. Though the Company considers the value of tenant relationships, the amounts are determined on a tenant-specific basis. On certain of our acquisitions this intangible has been deemed immaterial. In these instances no related intangible value is assigned.

In the event that a tenant terminates its lease, the unamortized portion of each intangible, including in-place lease values and tenant relationship values, is charged to expense and market rate adjustments (above or below) are recorded to revenue.

Depreciation and Amortization [Policy Text Block]

Depreciation and Amortization

The costs of buildings and improvements are depreciated using the straight-line method based on the following useful lives: buildings and improvements (five to 55 years) and tenant improvements (the shorter of the lease term or the life of the asset).

The Company's 2011 consolidated statement of operations contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million in 2011. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error during 2011 was not material to the Company's consolidated financial statements, the Company recorded the related adjustment during 2011.

Construction in Progress

Construction in Progress

Project costs directly associated with the development and construction of a real estate project are capitalized as construction in progress. Construction in progress also includes costs related to ongoing tenant improvement projects. In addition, interest, real estate taxes and other expenses that are directly associated with the Company’s development activities are capitalized until the property is placed in service. Internal direct costs are capitalized to projects in which qualifying expenditures are being incurred. Internal direct construction costs totaling $3.7 million in 2013, $4.7 million in 2012, $4.0 million in 2011 and interest totaling $2.6 million in 2013, $2.6 million in 2012, and $2.0 million in 2011 were capitalized related to development of certain properties and land holdings.

During the years ended December 31, 2013, 2012 and 2011, the Company's internal direct construction costs are comprised entirely of capitalized salaries. The following table shows the amount of compensation costs (including bonuses and benefits) capitalized for the years presented (in thousands):

	December 31,
	2013		2012		2011
Development	$	156	$	57	$	—
Redevelopment	194		353		—
Tenant Improvements	3,323		4,259		4,034
Total	$	3,673	$	4,669	$	4,034

Impairment or Disposal of Long-Lived Assets

Impairment or Disposal of Long-Lived Assets

The Company reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. In such case, an impairment loss is recognized in the amount of the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our holding strategy were to change or if market conditions were to otherwise dictate an earlier sale date, then an impairment loss may be recognized and such loss could be material. If we determine that impairment has occurred, the affected assets must be reduced to their fair value.

The relevant accounting guidance for impairments requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and if we will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally consider assets to be “held for sale” when the transaction has been approved by our Board of Trustees, or by officers vested with authority to approve the transaction and there are no known significant contingencies relating to the sale of the property within one year of the consideration date and the consummation of the transaction is otherwise considered probable.

Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value.

The Company determined during its impairment review of the year-ended December 31,2013, 2012 and 2011, that no impairment charges were necessary.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

Cash and cash equivalents are highly-liquid investments with original maturities of three months or less. The Company maintains cash equivalents in financial institutions in excess of insured limits, but believes this risk is mitigated by only investing in or through major financial institutions.

Restricted Cash, Policy [Policy Text Block]

Restricted Cash

Restricted cash consists of cash held as collateral to provide credit enhancement for the Company’s mortgage debt, cash for property taxes, capital expenditures and tenant improvements.

Accounts receivable and accrued rent receivable policy [Policy Text Block]

Accounts Receivable and Accrued Rent Receivable

Leases with tenants are accounted for as operating leases. Minimum annual rentals under tenant leases are recognized on a straight-line basis over the term of the related lease. The cumulative difference between lease revenue recognized under the straight-line method and contractual lease payment terms is recorded as “accrued rent receivable, net” on the accompanying balance sheets. Included in current tenant receivables are tenant reimbursements which are comprised of amounts recoverable from tenants for common area maintenance expenses and certain other recoverable expenses that are recognized as revenue in the period in which the related expenses are incurred. As of December 31, 2013 and 2012, no tenant represented more than 10% of accounts receivable and accrued rent receivable.

Tenant receivables and accrued rent receivables are carried net of the allowances for doubtful accounts of $3.2 million and $13.0 million in 2013, respectively and $3.1 million and $13.5 million in 2012, respectively. The allowance is an estimate based on two calculations that are combined to determine the total amount reserved. First, the Company evaluates specific accounts where it has determined that a tenant may have an inability to meet its financial obligations. In these situations, the Company uses its judgment, based on the facts and circumstances, and records a specific reserve for that tenant against amounts due to reduce the receivable to the amount that the Company expects to collect. These reserves are reevaluated and adjusted as additional information becomes available. Second, a reserve is established for all tenants based on a range of percentages applied to receivable aging categories for tenant receivables. For accrued rent receivables, the Company considers the results of the evaluation of specific accounts and also considers other factors including assigning risk factors to different industries based on its tenants SIC classification. Considering various factors including assigning a risk factor to different industries, these percentages are based on historical collection and write-off experience adjusted for current market conditions, which requires management’s judgments.

Investments in Unconsolidated Real Estate Ventures

Investments in Unconsolidated Real Estate Ventures

The Company accounts for its investments in unconsolidated Real Estate Ventures under the equity method of accounting as it is not the primary beneficiary (for VIEs) and the Company exercises significant influence, but does not control these entities under the provisions of the entities’ governing agreements pursuant to the accounting standard for the consolidation of VIEs. When the Company determines that its investment in an unconsolidated Real Estate Venture does not constitute a VIE, the Company utilizes the voting interest model under the accounting standard for consolidation to determine whether to consolidate the venture.

Under the equity method, investments in unconsolidated Real Estate Ventures are recorded initially at cost, as investments in Real Estate Ventures, and subsequently adjusted for equity in earnings, cash contributions, less distributions and impairments. On a periodic basis, management also assesses whether there are any indicators that the value of the Company’s investments in unconsolidated Real Estate Ventures may be other than temporarily impaired. An investment is impaired only if the value of the investment, as estimated by management, is less than the carrying value of the investment and the decline is other than temporary. To the extent that an impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

When the Company acquires an interest in or contributes assets to a real estate venture project, the difference between the Company’s cost basis in the investment and the value of the real estate venture or asset contributed is amortized over the life of the related assets, intangibles and liabilities and such adjustment is included in the Company’s share of equity in income of unconsolidated Real Estate Ventures. For purposes of cash flow presentation, distributions from unconsolidated Real Estate Ventures are presented as part of operating activities when they are considered as return on investments. Distributions in excess of the Company’s share in the cumulative unconsolidated Real Estate Ventures’ earnings are considered as return of investments and are presented as part of investing activities in accordance with the accounting standard for cash flow presentation.

Deferred Costs, Policy [Policy Text Block]

Deferred Costs

Costs incurred in connection with property leasing are capitalized as deferred leasing costs. Deferred leasing costs consist primarily of leasing commissions and internal leasing costs that are amortized using the straight-line method over the life of the respective lease which generally ranges from one to 15 years. Management re-evaluates the remaining useful lives of leasing costs as economic and market conditions change.

Costs incurred in connection with debt financing are capitalized as deferred financing costs and charged to interest expense over the terms of the related debt agreements. Deferred financing costs consist primarily of loan fees which are amortized over the related loan term on a basis that approximates the effective interest method. Deferred financing costs are accelerated, when debt is extinguished, as part of interest expense- amortization of deferred financing costs within the Company's consolidated statements of operations. Original issue discounts are recognized as part of the gain or loss on extinguishment of debt, as appropriate.

Notes Receivable

Notes Receivable

As of December 31, 2013 and 2012, notes receivable included a purchase money mortgage with a 20-year amortization period bearing interest at 8.5%, which was valued at $7.0 million and $7.2 million, respectively. The borrower had previously defaulted on the note. As a result, a forbearance agreement dated October 2011, as amended by a second forbearance agreement dated July 9, 2013, was entered into between the Company and the borrower, outlining the repayment terms of the outstanding debt. The Company has determined that the loan modifications represent a troubled debt restructuring due to the fact that the borrower was considered to be in a financial difficulty when it defaulted on the mortgage debt, and that a concession was granted in the form of the forbearance agreements. In accordance with the accounting standard for loan receivables the Company performs, on an ongoing basis, a collectability assessment of the note using the expected cash flow information provided by the borrower. Based on settlements subsequent to the balance sheet date and future cash flow projections provided by the borrower, it is anticipated that the note will be fully paid during 2015. As of December 31, 2013, the present value of the expected cash flows of the note receivable exceeded the outstanding balance of the note and therefore the note is considered recoverable as of December 31, 2013.

During 2012, the $23.5 million seven year purchase money mortgage note receivable (balance as of the payment date, including accrued but unpaid interest), which related to the 2009 sale of two Trenton properties, was paid in full prior to its scheduled maturity of October 2016. The Company also recognized a $12.9 million deferred gain and $1.0 million of interest income at the time of payment, in accordance with the accounting standard for installment sales.

Revenue Recognition

Revenue Recognition

Rental revenue is recognized on the straight-line basis, which averages minimum rents over the terms of the leases from the later of the date of the commencement of the lease or the date of acquisition of the property subject to existing leases. The straight-line rent adjustment increased revenue by approximately $17.7 million in 2013, $21.1 million in 2012 and $17.9 million in 2011. Deferred rents on the balance sheet represent rental revenue received prior to their due dates and amounts paid by the tenant for certain improvements considered to be landlord assets that will remain as the Company’s property at the end of the tenant’s lease term. The amortization of the amounts paid by the tenant for such improvements is calculated on a straight-line basis over the term of the tenant’s lease and is a component of straight-line rental income and increased revenue by $2.4 million in each of 2013, 2012 and 2011. Lease incentives, which are included as reductions of rental revenue in the accompanying consolidated statements of operations, are recognized on a straight-line basis over the term of the lease. Lease incentives decreased revenue by $0.7 million in 2013, $0.8 million in 2012, and $1.6 million in 2011.

The Company's leases also typically provide for tenant reimbursement of a portion of common area maintenance expenses and other operating expenses to the extent that a tenant’s pro rata share of expenses exceeds a base year level set in the lease or to the extent that the tenant has a lease on a triple net basis. For certain leases, the Company makes significant assumptions and judgments in determining the lease term, including assumptions when the lease provides the tenant with an early termination option. The lease term impacts the period over which the Company determines and records minimum rents and also impacts the period over which the Company amortizes lease-related costs.

In addition, the Company's rental revenue is impacted by the Company's determination of whether improvements to the properties, whether made by the Company or by the tenant, are landlord assets. The determination of whether an improvement is a landlord asset requires judgment. In making this judgment, our primary consideration is whether the improvement would be utilizable by another tenant upon move out of the improved space by the then-existing tenant. If the Company has funded an improvement that it determines not to be landlord assets, then it treats the costs of the improvement as lease incentives. If the tenant has funded the improvement that the Company determines to be landlord assets, then the Company treats the costs of the improvement as deferred revenue and amortize this cost into revenue over the lease term.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance expenses, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred.

Tenant reimbursements are recognized and presented in accordance with accounting guidance which requires that these reimbursements be recorded on a gross basis because the Company is generally the primary obligor with respect to the goods and services the purchase of which gives rise to the reimbursement obligation; because the Company has discretion in selecting the vendors and suppliers; and because the Company bears the credit risk in the event they do not reimburse the Company. The Company also receives payments from third parties for reimbursement of a portion of the payroll and payroll-related costs for certain of the Company's personnel allocated to perform services for these third parties and reflects these payments on a gross basis.

The Company recognizes gains on sales of real estate at times and in amounts determined in accordance with the accounting guidance for sales of real estate. The guidance takes into account the terms of the transaction and any continuing involvement, including in the form of management, leasing of space or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, then the Company defers some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery method, as appropriate, until the sales criteria are met

The Company derives parking revenues from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company receives management and development fees from third parties.

Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company records development fees as earned taking into account the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

No tenant represented greater than 10% of the Company’s rental revenue in 2013, 2012 or 2011

Income Taxes

Income Taxes

Parent Company

The Parent Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). In order to continue to qualify as a REIT, the Parent Company is required to, among other things, distribute at least 90% of its annual REIT taxable income to its shareholders and meet certain tests regarding the nature of its income and assets. As a REIT, the Parent Company is not subject to federal and state income taxes with respect to the portion of its income that meets certain criteria and is distributed annually to its shareholders. Accordingly, no provision for federal and state income taxes is included in the accompanying consolidated financial statements with respect to the operations of the Parent Company. The Parent Company intends to continue to operate in a manner that allows it to meet the requirements for taxation as a REIT. If the Parent Company fails to qualify as a REIT in any taxable year, it will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent tax years. The Parent Company is subject to certain local income taxes. Provision for such taxes has been included in general and administrative expenses in the Parent Company’s Consolidated Statements of Operations and Comprehensive Income.

The tax basis of the Parent Company’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Parent Company is subject to a 4% federal excise tax if sufficient taxable income is not distributed within prescribed time limits. The excise tax equals 4% of the annual amount, if any, by which the sum of (a) 85% of the Parent Company’s ordinary income and (b) 95% of the Parent Company’s net capital gain exceeds cash distributions and certain taxes paid by the Parent Company. No excise tax was incurred in 2013, 2012, or 2011.

The Parent Company has elected to treat several of its subsidiaries as taxable REIT subsidiaries (each a “TRS”). A TRS is subject to federal, state and local income tax. In general, a TRS may perform non-customary services for tenants, hold assets that the Parent Company, as a REIT, cannot hold directly and generally may engage in any real estate or non-real estate related business. The Company’s taxable REIT subsidiaries did not have any tax provisions or deferred income tax items as of December 31, 2013 and 2012.

Operating Partnership

In general, the Operating Partnership is not subject to federal and state income taxes, and accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements. The partners of the Operating Partnership are required to include their respective share of the Operating Partnership’s profits or losses in their respective tax returns. The Operating Partnership’s tax returns and the amount of allocable Partnership profits and losses are subject to examination by federal and state taxing authorities. If such examination results in changes to the Operating Partnership profits or losses, then the tax liability of the partners would be changed accordingly.

The tax basis of the Operating Partnership’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Operating Partnership may elect to treat one or more of its subsidiaries as REITs under Sections 856 through 860 of the Code. Each subsidiary REIT has met the requirements for treatment as a REIT under Sections 856 through 860 of the Code, and, accordingly, no provision has been made for federal and state income taxes in the accompanying consolidated financial statements. If any subsidiary REIT fails to qualify as a REIT in any taxable year, that subsidiary REIT will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent taxable years. Also, each subsidiary REIT may be subject to certain local income taxes.

The Operating Partnership has elected to treat several of its subsidiaries as TRSs, which are subject to federal, state and local income tax.

Earnings Per Share, Policy [Policy Text Block]

Earnings Per Share

Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings, if any, of certain securities, by the weighted average number of shares of common stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options, and conversion of the noncontrolling interests in the Operating Partnership.

Earnings Per Unit

Basic EPS is computed by dividing net income available to common unitholders, as adjusted for unallocated earnings, if any, of certain securities issued by the Operating Partnership, by the weighted average number of common unit equivalents outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options

Stock-Based Compensation Plans

Stock-Based Compensation Plans

The Parent Company maintains a shareholder-approved equity-incentive plan known as the Amended and Restated 1997 Long-Term Incentive Plan (the “1997 Plan”). The 1997 Plan is administered by the Compensation Committee of the Parent Company’s Board of Trustees. Under the 1997 Plan, the Compensation Committee is authorized to award equity and equity-based awards, including incentive stock options, non-qualified stock options, restricted shares and performance-based shares. On June 2, 2010, the Parent Company’s shareholders approved amendments to the 1997 Plan that, among other things, increased the number of common shares available for future awards under the 1997 Plan by 6,000,000 (of which 3,600,000 shares are available solely for options and share appreciation rights). As of December 31, 2013, 5,195,177 common shares remained available for future awards under the 1997 Plan (including 2,983,569 shares available solely for options and share appreciation rights). Through December 31, 2013 all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $8.3 million during 2013, of which $1.4 million was capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company incurred stock-based compensation expense of $8.6 million and $6.4 million during 2012 and 2011, of which $2.6 million and $1.5 million, respectively, were also capitalized. The expensed amounts are included in general and administrative expense on the Company’s consolidated income statement in the respective periods.

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income

Comprehensive income or loss is recorded in accordance with the provisions of the accounting standard for comprehensive income. The accounting standard establishes standards for reporting comprehensive income and its components in the financial statements. Comprehensive income includes the effective portions of changes in the fair value of derivatives.

Accounting for Derivative Instruments and Hedging Activities

Accounting for Derivative Instruments and Hedging Activities

The Company accounts for its derivative instruments and hedging activities in accordance with the accounting standard for derivative and hedging activities. The accounting standard requires the Company to measure every derivative instrument (including certain derivative instruments embedded in other contracts) at fair value and record them in the balance sheet as either an asset or liability. See disclosures below related to the accounting standard for fair value measurements and disclosures.

For derivatives designated as cash flow hedges, the effective portions of changes in the fair value of the derivative are reported in other comprehensive income while the ineffective portions are recognized in earnings.

The Company actively manages its ratio of fixed-to-floating rate debt. To manage its fixed and floating rate debt in a cost-effective manner, the Company, from time to time, enters into interest rate swap agreements as cash flow hedges, under which it agrees to exchange various combinations of fixed and/or variable interest rates based on agreed upon notional amounts.

Fair Value Measurements

Fair Value Measurements

The Company estimates the fair value of its derivatives in accordance with the accounting standard for fair value measurements and disclosures. The accounting standard defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. It also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value. Financial assets and liabilities recorded on the Consolidated Balance Sheets are categorized based on the inputs to the valuation techniques as follows:

• Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access;

• Level 2 inputs are inputs other than quoted prices included in Level 1, that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals; and

• Level 3 inputs are unobservable inputs for the asset or liability, which is typically based on an entity’s own assumptions, as there is little, if any, related market activity or information.

In instances where 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 input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2013 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2013		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Interest Rate Swaps	$	767	$	—	$	767	$	—
Liabilities:
Interest Rate Swaps	$	2,188	$	—	$	2,188	$	—

The following table sets forth the Company’s financial liabilities that were accounted for at fair value on a recurring basis as of December 31, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	14,210	$	—	$	14,210	$	—

We classify our interest rate swaps, shown above, within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments.

Non-financial assets and liabilities recorded at fair value on a non-recurring basis to which the Company would apply the accounting standard where a measurement was required under fair value would include:

• Non-financial assets and liabilities initially measured at fair value in an acquisition or business combination that are not remeasured at least quarterly at fair value,

• Long-lived assets measured at fair value due to an impairment in accordance with the accounting standard for the impairment or disposal of long-lived assets,

• Equity and cost method investments measured at fair value due to an impairment in accordance with the accounting standard for investments,

• Notes receivable adjusted for any impairment in its value in accordance with the accounting standard for loan receivables, and

• Asset retirement obligations initially measured at fair value under the accounting standard for asset retirement obligations.

Other than the remeasurements of our equity method investments of Six Tower Bridge, One Commerce Square and Two Commerce Square (see Note 3), the formation of the Austin Venture (see Note 4) and the 2013 business combinations (see Note 3), there were no items that were accounted for at fair value on a non-recurring basis for the twelve months ended December 31, 2013.

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Real Estate Investments Real Estate Investments, Acquisitions and Dispositions (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended		0 Months Ended				0 Months Ended						12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended									0 Months Ended					12 Months Ended
	Dec. 31, 2013 acre	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 acre	Dec. 31, 2012	Dec. 31, 2011	Dec. 19, 2013 One and Two Commerce Square [Member] Storey	Dec. 31, 2013 One and Two Commerce Square [Member] sqft	Dec. 19, 2013 Four Points Centre [Member] Storey acre sqft	Nov. 19, 2013 Cira Ground Land Parcel [Member] acre	Dec. 31, 2012 TB-BDN Plymouth Apartments [Member]	Sep. 05, 2012 TB-BDN Plymouth Apartments [Member] acre	Dec. 31, 2012 7400 West at Lantana [Member] sqft	Nov. 20, 2012 Wood Oak Drive Land [Member] sqft	Dec. 11, 2012 1900 Market [Member] sqft	Jan. 06, 2012 Plymouth Meeting, Pennsylvania [Member] sqft	Dec. 19, 2013 875 First Avenue [Member] sqft	Oct. 17, 2013 1336 Enterprise Drive [Member] sqft	Dec. 31, 2013 Dabney Land, East [Member]	Aug. 05, 2013 Dabney Land, East [Member] acre	Jun. 14, 2013 Pacific View Plaza [Member] sqft	Feb. 25, 2014 Princeton Pike Corporate Center [Member]	Feb. 25, 2013 Princeton Pike Corporate Center [Member] sqft Properties	Jul. 18, 2012 Oaklands Corporate Center [Member] sqft	Jun. 22, 2012 Pacific Ridge Corporate Center [Member] sqft	Mar. 22, 2012 South Lake at Dulles Corner [Member] sqft	Jan. 17, 2012 304 Harper Drive [Member] sqft	Jun. 28, 2013 The Bluffs [Member] sqft	Jun. 28, 2013 100 Arrandale Boulevard [Member] sqft	Jun. 19, 2013 1700 Paoli Pike [Member] sqft	Jul. 10, 2012 Brandywine - Al Venture [Member] Properties sqft	Dec. 31, 2013 Brandywine - Al Venture [Member]	Apr. 25, 2013 Three Logan Square [Member] acre	Dec. 31, 2013 Secured Debt [Member]	Dec. 31, 2012 Secured Debt [Member]	Dec. 19, 2013 Secured Debt [Member] Two Commerce Square [Member] Rate	Dec. 19, 2013 Secured Debt [Member] One Commerce Square [Member] Rate	Dec. 31, 2013 Subsidiaries [Member]	Dec. 31, 2012 Subsidiaries [Member]	Dec. 31, 2011 Subsidiaries [Member]
Significant Acquisitions and Disposals [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage												99.00%
Business Acquisition, Pro Forma Revenue									$ 610,979,000	$ 592,753,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																																									3.96%	5.67%
Long-term Debt, Fair Value																																									107,900,000	130,200,000
Long-term Debt, Gross																																							669,762,000	443,942,000	112,000,000	125,100,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual									3,400,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual									200,000
Net gain from remeasurement of investments in real estate ventures									6,866,000	0	0	981,000																															6,866,000	0	0
Number of floors of a building												41		3
Area of Land														22.3	0.8										8													1.8
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds												331,800,000		47,300,000				32,100,000	2,100,000	34,800,000	9,100,000
Business Combination, Assumption of Existing Mortgage Debt												237,100,000
Ground Lease Buy-out, Total Cost															24,600,000																							20,800,000
Accrued Rent															12,100,000
Adjustment to Record Land Acquisition to Fair Value									7,752,000	0	0																											4,300,000					7,752,000	0
Payments to Acquire Real Estate									161,604,000	77,555,000	40,674,000																																161,604,000	77,555,000	40,674,000
Proceeds from Real Estate and Real Estate Joint Ventures																																				120,600,000
Gains (Losses) on Sales of Investment Real Estate									0	0	2,985,000																																0	0	2,985,000
Equity Method Investments	180,512,000				193,555,000				180,512,000	193,555,000	115,807,000																										46,406,000						180,512,000	193,555,000
Company's Ownership Percentage in the Real Estate Venture																	50.00%																				50.00%
Secured Debt	670,151,000				442,974,000				670,151,000	442,974,000																													670,151,000	442,974,000			670,151,000	442,974,000
Balance of the Financing Obligation	32,923,000				55,826,000				32,923,000	55,826,000																																	32,923,000	55,826,000
Lease percentage of acquired property													86.70%	99.20%
Business Acquisition Purchase Price Allocation Intangible Assets														6,500,000				8,400,000		13,500,000
Business Acquisition Purchase Price Allocated To Market Lease Liabilities														1,000,000				1,900,000		3,800,000
Other Ownership Interests, Contributed Capital																	15,500,000
Number of Units in Real Estate Property																	398
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures																15,200,000
Permanent Basis Adjustment Between Carrying Value And Fair Value																300,000
Net rentable space of property acquired													1,896,142	192,396				136,075	10	456,922	154,392															497,896
Amount Contributed Net of Closing Costs and Customary Prorations																																				26,100,000
Acquisition related costs												900,000		100,000	1,400,000			100,000		100,000	100,000																	100,000
Gain (Loss) on Sale of Properties									3,382,000	34,774,000	7,047,000											100,000	200,000			(500,000)	5,300,000		9,900,000	(2,800,000)	14,500,000	200,000	(900,000)	(400,000)	(400,000)								3,382,000	34,774,000	7,047,000
Business Acquisition Purchase Price Allocation Building														36,000,000				20,900,000		17,300,000
Business Acquisition Purchase Price Allocation, Land Portion														5,800,000				4,700,000		7,800,000
Number of flex/office properties sold																												8	11
Net rentable square feet of properties sold																						50,000	39,330			51,695		800,546	466,719	121,381	268,240	32,978	68,708	34,931	28,000
Sales price of properties sold																						3,800,000	2,600,000		500,000	10,300,000		121,000,000	52,700,000	29,000,000	91,100,000	3,000,000	18,000,000	3,500,000	2,700,000
Net gain (loss) on sale of undepreciated real estate									(137,000)	0	0													(100,000)																			(137,000)	0	0
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land	3.8								3.8								20
Number of Real Estate Properties																																				3
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax									21,805,000	(60,011,000)
Business Acquisition, Pro Forma Net Income (Loss)									25,957,000	(16,970,000)
Continuing operations (in dollars per share)									$ 0.20	$ (0.36)	$ (0.24)																																$ 0.20	$ (0.36)	$ (0.23)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic									$ 0.14	$ (0.42)
Income (Loss) from Continuing Operations, Per Diluted Share									$ 0.20	$ (0.36)	$ (0.24)																																$ 0.20	$ (0.36)	$ (0.23)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted									$ 0.14	$ (0.42)
Earnings Per Share, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)																																$ 0.23	$ (0.06)	$ (0.09)
Pro Forma, Earnings Per Share, Basic									$ 0.17	$ (0.12)
Earnings Per Share, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)																																$ 0.23	$ (0.06)	$ (0.09)
Pro Forma Earnings Per Share, Diluted									$ 0.17	$ (0.12)
Settlement period to finalize a business combination												60 days
Other Assets	$ 62,377,000				$ 53,325,000				$ 62,377,000	$ 53,325,000		$ 2,100,000																															$ 62,377,000	$ 53,325,000

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Beneficiaries Equity of the Parent Company

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

BENEFICIARIES' EQUITY OF THE PARENT COMPANY

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Net (income) loss from continuing operations attributable to non-controlling interests	(357		)	(357		)	863			863			994			994
Amount allocable to unvested restricted shareholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred share dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred share redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common shareholders	31,362			31,362			(51,279		)	(51,279		)	(32,059		)	(32,059		)
Income from discontinued operations	4,207			4,207			43,838			43,838			19,841			19,841
Discontinued operations attributable to non-controlling interests	(55		)	(55		)	(797		)	(797		)	(778		)	(778		)
Discontinued operations attributable to common shareholders	4,152			4,152			43,041			43,041			19,063			19,063
Net income (loss) attributable to common shareholders	$	35,514		$	35,514		$	(8,238	)	$	(8,238	)	$	(12,996	)	$	(12,996	)
Denominator
Weighted-average shares outstanding	153,140,458			153,140,458			143,257,097			143,257,097			135,444,424			135,444,424
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average shares outstanding	153,140,458			154,414,311			143,257,097			143,257,097			135,444,424			135,444,424
Earnings per Common Share:
Income (loss) from continuing operations attributable to common shareholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.24	)	$	(0.24	)
Discontinued operations attributable to common shareholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common shareholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)

Redeemable common limited partnership units totaling 1,763,739 in 2013, 1,845,737 in 2012, and 2,698,647 in 2011 were excluded from the diluted earnings per share computations because they are not dilutive.

The contingent securities/share based compensation impact is calculated using the treasury stock method and relates to employee awards settled in shares of the Parent Company. The effect of these securities is anti-dilutive for periods that the Parent Company incurs a net loss from continuing operations available to common shareholders and therefore is excluded from the dilutive earnings per share calculation in such periods.

Unvested restricted shares are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the years ended December 31, 2013, 2012 and 2011, earnings representing nonforfeitable dividends were allocated to the unvested restricted shares issued to the Company’s executives and other employees under the 1997 Plan.

Common and Preferred Shares

On December 10, 2013, the Parent Company declared a distribution of $0.15 per common share, totaling $23.9 million, which was paid on January 21, 2014 to shareholders of record as of January 6, 2014. On December 10, 2013, the Parent Company declared distributions on its Series E Preferred Shares to holders of record as of December 30, 2013. These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on January 15, 2014 to holders of Series E Preferred Shares totaled $1.7 million.

On November 5, 2013, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell, in at-the-market offerings, up to an aggregate amount of 16,000,000 common shares until November 5, 2016. This Offering Program replaced a prior continuous equity offering program which expired on March 10, 2013. The Parent Company may sell common shares in amounts and at times to be determined by the Parent Company. Actual sales will depend on a variety of factors to be determined by the Parent Company, including, among others, market conditions, the trading price of the Company’s common shares of beneficial interest and determinations by the Parent Company of the appropriate sources of funding. In conjunction with the Offering Program, the Parent Company engages sales agents who receive compensation, in aggregate, of up to 2% of the gross sales price per share sold. From inception of the Offering Program through December 31, 2013, the Parent Company has not sold any shares under the program, resulting in 16,000,000 remaining shares available for sale.

On April 10, 2013, the Parent Company closed a public offering of 12,650,000 common shares, inclusive of 1,650,000 common shares issued upon exercise by the underwriters of the option granted to them to purchase additional shares. The Parent Company contributed the net proceeds from the sale of shares, amounting to $181.5 million after deducting underwriting discounts and commissions and other offering expenses, to the Operating Partnership in exchange for partnership units of the Operating Partnership. The Operating Partnership continues to use the net proceeds for working capital, capital expenditures and other general corporate purposes, which may include acquisitions, developments and the repayment, repurchase and refinancing of debt.

Common Share Repurchases

The Parent Company maintains a share repurchase program under which it may repurchase its common shares from time to time in accordance with limits set by the Board of Trustees.

The Parent Company did not repurchase any shares under the share repurchase program during the year-ended December 31, 2013. As of December 31, 2013, the Parent Company may purchase an additional 539,200 shares under the program.

Repurchases may be made from time to time in the open market or in privately negotiated transactions, subject to market conditions and compliance with legal requirements. The share repurchase program does not contain any time limitation and does not obligate the Parent Company to repurchase any shares. The Parent Company may discontinue the program at any time.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2013		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Interest Rate Swaps	$	767	$	—	$	767	$	—
Liabilities:
Interest Rate Swaps	$	2,188	$	—	$	2,188	$	—

The following table sets forth the Company’s financial liabilities that were accounted for at fair value on a recurring basis as of December 31, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	14,210	$	—	$	14,210	$	—

Schedule of Capitalized Salaries Including Bonuses and Benefits [Table Text Block]

During the years ended December 31, 2013, 2012 and 2011, the Company's internal direct construction costs are comprised entirely of capitalized salaries. The following table shows the amount of compensation costs (including bonuses and benefits) capitalized for the years presented (in thousands):

	December 31,
	2013		2012		2011
Development	$	156	$	57	$	—
Redevelopment	194		353		—
Tenant Improvements	3,323		4,259		4,034
Total	$	3,673	$	4,669	$	4,034

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Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Operating Leases, Future Minimum Payments Receivable [Abstract]
Operating Leases, Future Minimum Payments Receivable, Current	$ 471,918
Operating Leases, Future Minimum Payments Receivable, in Two Years	457,315
Operating Leases, Future Minimum Payments Receivable, in Three Years	416,467
Operating Leases, Future Minimum Payments Receivable, in Four Years	358,368
Operating Leases, Future Minimum Payments Receivable, in Five Years	299,619
Operating Leases, Future Minimum Payments Receivable, Thereafter	$ 1,403,003

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Share Based and Deferred Compensation

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE BASED AND DEFERRED COMPENSATION

SHARE BASED COMPENSATION, 401(k) PLAN AND DEFERRED COMPENSATION

Stock Options

At December 31, 2013, options exercisable for 2,983,569 common shares were outstanding under the Parent Company's shareholder approved equity incentive plan. There were 184,429 options unvested as of December 31, 2013 and $0.1 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 0.2 years. During the years ended December 31, 2013, 2012 and 2011 the Company recognized compensation expense related to unvested options of $0.7 million, $1.6 million, and $1.4 million, respectively. During the years ended December 31, 2013, 2012 and 2011, the Company also capitalized a $0.1 million, $0.5 million and $0.4 million, respectively, of compensation expense as part of the Company’s review of employee salaries eligible for capitalization.

Option activity as of December 31, 2013 and changes during the year-ended December 31, 2013 were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	3,337,549		$	14.85	5.95	$	—
Exercised	(236,318	)	$	9.86
Forfeited/Expired	(117,662	)	$	18.61
Outstanding at December 31, 2013	2,983,569		$	15.50	5.15	$	—
Vested/Exercisable at December 31, 2013	2,799,140		$	15.74	5.05	$	—

401(k) Plan

The Company sponsors a 401(k) defined contribution plan for its employees. Each employee may contribute up to 100% of annual compensation, subject to specific limitations under the Internal Revenue Code. At its discretion, the Company can make matching contributions equal to a percentage of the employee’s elective contribution and profit sharing contributions. Employees automatically vest in employer contributions. The Company contributions were $0.4 million in each of 2013, 2012 and 2011.

Restricted Share Awards

As of December 31, 2013, 563,713 restricted shares were outstanding under the 1997 Plan and vest over three to seven years from the initial grant date. The remaining compensation expense to be recognized at December 31, 2013 was approximately $1.9 million, and is expected to be recognized over a weighted average remaining vesting period of 1.1 years. During 2013 the Company recognized compensation expense related to outstanding restricted shares of $3.2 million, of which $0.6 million was capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the years ended December 31, 2012 and 2011, the Company recognized $3.4 million (of which $0.9 million was capitalized) and $3.2 million (of which $0.7 million was capitalized), respectively, of compensation expense included in general and administrative expense in the respective periods related to outstanding restricted shares.

The following table summarizes the Company’s restricted share activity during the year-ended December 31, 2013:

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2013	597,708		$	12.57
Granted	182,576		13.13
Vested	(208,306	)	13.13
Forfeited	(8,265	)	11.41
Non-vested at December 31, 2013	563,713		$	12.56

On February 25, 2013, the Compensation Committee of the Company’s Board of Trustees awarded 157,208 restricted shares to the Company’s executives. The restricted shares will cliff vest after three years from the grant date. The vesting of the restricted shares is also subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled, or be terminated without cause or retire in a qualifying retirement. Qualifying retirement means the recipient’s voluntary termination of employment after reaching at least age 57 and accumulating at least 15 years of service with the Company. In accordance with the accounting standard for stock-based compensation, the Company amortizes stock-based compensation costs through the qualifying retirement dates for those executives who meet the conditions for qualifying retirement during the scheduled vesting period.

Restricted Performance Share Units Plan

On each of February 25, 2013, March 1, 2012 and March 2, 2011, the Compensation Committee of the Parent Company’s Board of Trustees awarded an aggregate of 231,093, 242,122, and 113,256 share-based awards, respectively, to its executives. These awards are referred to as Restricted Performance Share Units, or RPSUs. The RPSUs represent the right to earn common shares. The number of common shares, if any, deliverable to award recipients depends on the Company’s performance based on its total return to shareholders during the three years measurement period that commenced on January 1, 2013 (in the case of the February 25, 2013 awards), January 1, 2012 (in the case of the March 1, 2012 awards), and January 1, 2011 (in the case of the March 2, 2011 awards), and that ends on December 31, 2015, December 31, 2014 or December 31, 2013 (as applicable) or, if earlier, the date of a change of control. In the case of the awards made on February 25, 2013 and March 1, 2012, the Company's performance is compared to the shareholder return of REITs within an index over the measurement period for 50% of the RPSUs awarded on that date, with the remaining 50% being compared to the total shareholder return of REITs within the Company's proxy peer group over such period. In the case of the awards made on March 2, 2011, the Company's performance is compared to the total shareholder return of REITs within an index over the performance period. The vesting of RPSUs is contingent upon the continued employment of the participants through the performance periods (with exceptions for death, disability and qualifying retirement). Dividends are deemed credited to the performance units accounts and are applied to “acquire” additional RPSUs for the account of the unit holder at the price per common share on the dividend payment date. If earned, RPSUs will be settled in common shares in an amount that reflects both the number of RPSUs in the holder’s account at the end of the applicable measurement period and the Company’s total return to shareholders during the applicable three year measurement period relative to the total shareholder returns of the REITs within the index or peer group, as applicable.

On the date of each grant, the RPSUs were valued using a Monte Carlo simulation. The fair values of the 2013, 2012 and 2011 awards on the grant dates were $4.1 million, $4.1 million and $2.0 million, respectively. The fair values of each award are being amortized over the three year cliff vesting period. The vesting of RPSUs is subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled or retire in a qualifying retirement prior to the vesting date. In the case of two of the Company's executives who have employment agreements with the Company, the vesting of the restricted shares is also subject to acceleration if either executive were to be terminated without cause or resign for good reason. Qualifying retirement means the recipient’s voluntary termination of employment after reaching age 57 years and accumulating at least 15 years of service with the Company. In accordance with the accounting standard for stock-based compensation, the Company amortizes stock-based compensation costs through the qualifying retirement date for those executives who meet the conditions for qualifying retirement during the schedule vesting period.

For the year-ended December 31, 2013, the Company recognized total compensation expense for the 2013, 2012 and 2011 RPSU awards of $4.4 million of which $0.8 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation. For the year-ended December 31, 2012, the Company recognized total compensation expense for the 2012, 2011 and 2010 awards of $3.5 million related to this plan, of which $1.2 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation. During the year ended December 31, 2011, the Company recognized total compensation expense for the 2011, 2010, and 2009 awards of $1.7 million related to this plan, of which $0.5 million was capitalized as part of the Company’s policies for capitalizing eligible portions of employee compensation.

A total of 64,678 common shares vested on December 31, 2012 (the end of the three-year measurement period for the linked RPSUs) and were delivered to holders of the RPSUs on March 1, 2013 in settlement of the RPSUs. Holders of these RPSUs also received cash dividend equivalents to the cash dividends paid on common shares on February 8, 2013.

Employee Share Purchase Plan

The Parent Company’s shareholders approved the 2007 Non-Qualified Employee Share Purchase Plan (the “ESPP”), which is intended to provide eligible employees with a convenient means to purchase common shares of the Parent Company through payroll deductions and voluntary cash purchases at an amount equal to 85% of the average closing price per share for a specified period. Under the plan document, the maximum participant contribution for the 2013 plan year is limited to the lesser of 20% of compensation or $50,000. The ESPP allows the Parent Company to make open market purchases, which reflects all purchases made under the plan to date. In addition, the number of shares separately reserved for issuance under the ESPP is 1.25 million. During the year-ended December 31, 2013, employees made purchases under the ESPP of $0.3 million and the Company recognized $0.1 million of compensation expense related to the ESPP. During the years-ended December 31, 2012 and 2011, employees made purchases of $0.4 million under the ESPP, and the Company recognized $0.1 million of compensation expense related to the ESPP. Compensation expense represents the 15% discount on the purchase price. The Board of Trustees of the Parent Company may terminate the ESPP at its sole discretion at any time.

Deferred Compensation

In January 2005, the Parent Company adopted a Deferred Compensation Plan (the “Plan”) that allows trustees and certain key employees to voluntarily defer compensation. Compensation expense is recorded for the deferred compensation and a related liability is recognized. Participants may elect designated benchmark investment options for the notional investment of their deferred compensation. The deferred compensation obligation is adjusted for deemed income or loss related to the investments selected. At the time the participants defer compensation, the Company records a liability, which is included in the Company’s consolidated balance sheet. The liability is adjusted for changes in the market value of the participant-selected investments at the end of each accounting period, and the impact of adjusting the liability is recorded as an increase or decrease to compensation cost.

The Company has purchased mutual funds which can be utilized as a funding source for the Company’s obligations under the Plan. Participants in the Plan have no interest in any assets set aside by the Company to meet its obligations under the Plan. For the years-ended December 31, 2013, 2012 and 2011 the Company recorded net increases in compensation costs of $0.2 million, $0.3 million and $0.1 million, respectively, net of investments in the company-owned policies and mutual funds.

Participants in the Plan may elect to have all or a portion of their deferred compensation invested in the Company’s common shares. The Company holds these shares in a rabbi trust, which is subject to the claims of the Company’s creditors in the event of the Company’s bankruptcy or insolvency. The Plan does not permit diversification of a participant’s deferral allocated to the Company common shares and deferrals allocated to Company common shares can only be settled with a fixed number of shares. In accordance with the accounting standard for deferred compensation arrangements where amounts earned are held in a rabbi trust and invested, the deferred compensation obligation associated with the Company’s common shares is classified as a component of shareholder’s equity and the related shares are treated as shares to be issued and are included in total shares outstanding. At December 31, 2013 and 2012, 0.3 million of such shares were included in total shares outstanding. Subsequent changes in the fair value of the common shares are not reflected in operations or shareholders’ equity of the Company.

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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of results of operations of Real Estate Ventures
Income (Loss) from Equity Method Investments	$ 3,664	$ 2,741	$ 3,775
Unconsolidated real estate ventures [Member]
Summary of results of operations of Real Estate Ventures
Revenue	102,919	164,013	145,867
Operating expenses	40,436	70,775	63,715
Interest expense, net	26,529	41,633	42,032
Depreciation and amortization	35,138	50,241	39,172
Net income	816	1,364	948
Income (Loss) from Equity Method Investments	$ 3,664	$ 2,741	$ 3,775

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Consolidated Statements of Beneficiaries' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Distributions Declared, Per Share	$ 0.60	$ 0.60	$ 0.60
Cumulative Distributions
Distributions Declared, Per Share	$ 0.15	$ 0.15	$ 0.60
Non-Controlling Interests
Distributions Declared, Per Share	$ 0.15	$ 0.15	$ 0.60

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Real estate investments:
Operating properties	$ 4,669,289	$ 4,726,169
Accumulated depreciation	(983,808)	(954,665)
Operating real estate investments, net	3,685,481	3,771,504
Construction-in-progress	74,174	48,950
Land inventory	93,351	102,439
Total real estate investments, net	3,853,006	3,922,893
Cash and cash equivalents	263,207	1,549
Accounts receivable, net	17,389	13,232
Accrued rent receivable, net	126,295	122,066
Investment in real estate ventures, at equity	180,512	193,555
Deferred costs, net	122,954	122,243
Intangible assets, net	132,329	70,620
Notes receivable	7,026	7,226
Other Assets	62,377	53,325
Total assets	4,765,095	4,506,709
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	670,151	442,974
Unsecured credit facility	0	69,000
Unsecured term loans	450,000	450,000
Unsecured senior notes, net of discounts	1,475,230	1,503,356
Accounts payable and accrued expenses	83,693	71,579
Distributions payable	25,584	23,652
Deferred income, gains and rent	71,635	82,947
Acquired lease intangibles, net	34,444	33,859
Other liabilities	32,923	55,826
Total liabilities	2,843,660	2,733,193
Commitments and contingencies (Note 20)
Brandywine Realty Trust's equity:
6.90% Series E Preferred Shares/Units; issued and outstanding- 4,000,000 in 2013 and 2012	40	40
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 200,000,000; 156,731,993 and 143,538,733 issued and outstanding in 2013 and 2012, respectively	1,566	1,434
Additional paid-in capital	2,971,596	2,780,194
Deferred compensation payable in common shares	5,407	5,352
Common shares in grantor trust, 312,280 in 2013 and 290,745 in 2012	(5,407)	(5,352)
Cumulative earnings	522,528	479,734
Accumulated other comprehensive loss	(2,995)	(15,918)
Cumulative distributions	(1,592,515)	(1,493,206)
Total equity, excluding non-controlling interests	1,900,220	1,752,278
Non-controlling interests	21,215	21,238
Total equity	1,921,435	1,773,516
Total liabilities and equity	4,765,095	4,506,709
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	4,669,289	4,726,169
Accumulated depreciation	(983,808)	(954,665)
Operating real estate investments, net	3,685,481	3,771,504
Construction-in-progress	74,174	48,950
Land inventory	93,351	102,439
Total real estate investments, net	3,853,006	3,922,893
Cash and cash equivalents	263,207	1,549
Accounts receivable, net	17,389	13,232
Accrued rent receivable, net	126,295	122,066
Investment in real estate ventures, at equity	180,512	193,555
Deferred costs, net	122,954	122,243
Intangible assets, net	132,329	70,620
Notes receivable	7,026	7,226
Other Assets	62,377	53,325
Total assets	4,765,095	4,506,709
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	670,151	442,974
Unsecured credit facility	0	69,000
Unsecured term loans	450,000	450,000
Unsecured senior notes, net of discounts	1,475,230	1,503,356
Accounts payable and accrued expenses	83,693	71,579
Distributions payable	25,584	23,652
Deferred income, gains and rent	71,635	82,947
Acquired lease intangibles, net	34,444	33,859
Other liabilities	32,923	55,826
Total liabilities	2,843,660	2,733,193
Commitments and contingencies (Note 20)
Redeemable limited partnership units at redemption value;
Redeemable limited partnership units at redemption value; 1,763,739 and 1,845,737 issued and outstanding in 2013 and 2012, respectively	26,486	26,777
Brandywine Realty Trust's equity:
6.90% Series E Preferred Shares/Units; issued and outstanding- 4,000,000 in 2013 and 2012	96,850	96,850
General Partnership Capital, 156,731,993 and 143,538,733 units issued and outstanding in 2013 and 2012, respectively	1,800,530	1,666,341
Accumulated other comprehensive loss	(3,377)	(16,452)
Total equity, excluding non-controlling interests	1,894,003	1,746,739
Non-controlling interests	946	0
Total equity	1,894,949	1,746,739
Total liabilities and equity	4,765,095	4,506,709
7.375% Series D Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Total equity	0	0
6.90% Series E Preferred Stock [Member]
Brandywine Realty Trust's equity:
Total equity	40	40
6.90% Series E Preferred Stock [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Total equity	0	0
Series E-linked Preferred Stock [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
6.90% Series E Preferred Shares/Units; issued and outstanding- 4,000,000 in 2013 and 2012		96,850
Total equity	96,850	96,850
Noncontrolling Interest [Member]
Brandywine Realty Trust's equity:
Total equity	21,215	21,238
Noncontrolling Interest [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Total equity	$ 946	$ 0

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Debt Obligations

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

DEBT OBLIGATIONS

DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at December 31, 2013 and 2012 (in thousands):

Property / Location	December 31, 2013			December 31, 2012			Effective Interest Rate			Maturity Date
MORTGAGE DEBT:
Tysons Corner	$	91,395		$	93,188		5.36	%		Aug-15
One Commerce Square	125,089			—			3.68	%	(a)	Jan-16
Two Logan Square	88,583			89,340			7.57	%		Apr-16
Fairview Eleven Tower	21,630			22,000			4.25	%	(b)	Jan-17
Two Commerce Square	112,000			—			4.51	%	(a)	Apr-23
IRS Philadelphia Campus	190,964			197,111			7.00	%		Sep-30
Cira South Garage	40,101			42,303			7.12	%		Sep-30
Principal balance outstanding	669,762			443,942
Plus: fair market value premiums (discounts), net	389			(968		)
Total mortgage indebtedness	$	670,151		$	442,974
UNSECURED DEBT:
Credit Facility	—			69,000			LIBOR + 1.50%			Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			150,000			2.60	%		Feb-15
Four-Year Term Loan	100,000			100,000			LIBOR + 1.75%			Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			200,000			3.62	%		Feb-19
$250.0M 5.400% Guaranteed Notes due 2014	218,549			238,379			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	157,625			166,535			7.76	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	149,919			150,429			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.68	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.13	%		Apr-18
$250.0M 3.950% Guaranteed Notes due 2023	250,000			250,000			4.02	%		Feb-23
Indenture IA (Preferred Trust I)	27,062			27,062			2.75	%		Mar-35
Indenture IB (Preferred Trust I)	25,774			25,774			3.30	%		Apr-35
Indenture II (Preferred Trust II)	25,774			25,774			3.09	%		Jul-35
Principal balance outstanding	1,929,703			2,027,953
plus: original issue premium (discount), net	(4,473		)	(5,597		)
Total unsecured indebtedness	$	1,925,230		$	2,022,356
Total Debt Obligations	$	2,595,381		$	2,465,330

(a) This loan was assumed upon acquisition of the related properties on December 19, 2013. The interest rate reflects the market rate at the time of acquisition.

(b) Represents the full debt amount of a property in a consolidated joint venture for which the Company maintains a 50% interest.

During 2013, 2012, and 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 5.73%, 6.65%, and 6.72%, respectively. As of December 31, 2013 and 2012, the net carrying value of the Company's Properties that are encumbered by mortgage indebtedness was $669.8 million and $591.3 million, respectively.

During the year-ended December 31, 2013, the Company repurchased $29.3 million of its outstanding unsecured Notes in a series of transactions that are summarized in the following table (in thousands):

Notes	Principal		Repurchase Amount		Loss on Early Extinguishment of Debt			Acceleration of Deferred Financing Amortization
2014 5.400% Notes	$	19,830	$	20,822	$	(1,020	)	$	16
2015 7.500% Notes	8,910		9,902		(1,036		)	23
2016 6.000% Notes	510		572		(63		)	1
	$	29,250	$	31,296	$	(2,119	)	$	40

The Parent Company unconditionally guarantees the unsecured debt obligations of the Operating Partnership (or is a co-borrower with the Operating Partnership) but does not by itself incur unsecured indebtedness. The Parent Company has no material assets other than its investment in the Operating Partnership.

The Company utilizes its unsecured revolving credit facility (the "Credit Facility") for general business purposes, including funding costs of acquisitions, developments and redevelopments and repayment of other debt. The scheduled maturity date of the Credit Facility in place at December 31, 2013 is February 1, 2016. The per annum variable interest rate on the outstanding balances is LIBOR plus 1.50%. The interest rate and facility fee are subject to adjustment upon a change in the Company’s unsecured debt ratings. During each of the years ended December 31, 2013 and 2012, the weighted-average interest rates associated with the Credit Facility was 0.29% and 1.02%, respectively. As of December 31, 2013, the Company did not have any outstanding borrowings on its Credit Facility, with $1.3 million in letters of credit outstanding, leaving $598.7 million of unused availability under the Credit Facility.

The Company has the option to increase the amounts available to be advanced under the Credit Facility, the $150.0 million three-year term loan, and the $100.0 million four-year term loan by an aggregate of $200.0 million, subject to customary conditions and limitations, by obtaining additional commitments from the current lenders and other financial institutions. The Company also has the option to extend the maturity dates of each of the Credit Facility, the $150.0 million three-year term loan and the $100.0 million four-year term loan by one year, subject to payment of an extension fee and other customary conditions and limitations. The Company may repay the $150.0 million three-year term and the $100.0 million four-year term loans at any time without penalty. The $200.0 million seven-year term loan is subject to a prepayment penalty of 1.00% through February 1, 2015 with no penalty thereafter.

The spread to LIBOR for LIBOR-based loans under the Credit Facility and term loans depends on the Company's unsecured senior debt credit rating. Based on the Company's current credit rating, the spread for such loans will be 150 basis points under the Credit Facility, 175 basis points under both the $150.0 million three-year term loan and $100.0 million four-year term loan and 190 basis points under the $200.0 million seven-year term loan. At the Company's option, advances under the Credit Facility and term loans may also bear interest at a per annum floating rate equal to the higher of the prime rate or the federal funds rate plus 0.50% per annum. The Credit Facility contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loans to the Company at a reduced rate. The Company executed hedging transactions that fix the rate on the $200.0 million seven-year term loan at a 3.623% average rate for its full term, and the rate on the $150.0 million three-year term loan at a 2.596% average rate for periods of three to four years. All hedges commenced on February 1, 2012 and the rates are inclusive of the LIBOR spread based on our current investment grade rating. See Note 9 for details of the interest rate swaps entered into as of December 31, 2013.

The Credit Facility and term loans contain financial and operating covenants and restrictions. The Company was in compliance with all such restrictions and financial covenants as of December 31, 2013. In the event of a default related to the financing and operating covenants, the Company's dividend distributions are limited to the greater of 95% of funds from operations or the minimum amount necessary for the Company to maintain its status as a REIT.

As of December 31, 2013, the Company’s aggregate scheduled principal payments of debt obligations, excluding amortization of discounts and premiums, were as follows (in thousands):

2014	$	232,375
2015	409,654
2016	467,705
2017	330,323
2018	336,954
Thereafter	822,454
Total principal payments	2,599,465
Net unamortized premiums/(discounts)	(4,084		)
Outstanding indebtedness	$	2,595,381

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Schedule III - Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended																																																																	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 400 Berwyn Park [Member]	Dec. 31, 2013 300 Berwyn Park [Member]	Dec. 31, 2013 1050 Westlakes Drive [Member]	Dec. 31, 2013 1200 Swedesford Road [Member]	Dec. 31, 2013 200 Berwyn Park [Member]	Dec. 31, 2013 1180 Swedesford Road [Member]	Dec. 31, 2013 100 Berwyn Park [Member]	Dec. 31, 2013 1160 Swedesford Road [Member]	Dec. 31, 2013 1100 Cassett Road [Member]	Dec. 31, 2013 980 Harvest Drive [Member]	Dec. 31, 2013 925 Harvest Drive [Member]	Dec. 31, 2013 920 Harvest Drive [Member]	Dec. 31, 2013 Six Tower Bridge [Member]	Dec. 31, 2013 426 Lancaster Avenue [Member]	Dec. 31, 2013 52 Swedesford Square [Member]	Dec. 31, 2013 One Progress Drive [Member]	Dec. 31, 2013 500 Enterprise Drive [Member]	Dec. 31, 2013 640 Freedom Business Center [Member]	Dec. 31, 2013 555 Croton Road [Member]	Dec. 31, 2013 630 Allendale Road [Member]	Dec. 31, 2013 620 Freedom Business Center [Member]	Dec. 31, 2013 1000 First Avenue [Member]	Dec. 31, 2013 1060 First Avenue [Member]	Dec. 31, 2013 630 Freedom Business Center [Member]	Dec. 31, 2013 1040 First Avenue [Member]	Dec. 31, 2013 1020 First Avenue [Member]	Dec. 31, 2013 610 Freedom Business Center [Member]	Dec. 31, 2013 650 Park Avenue [Member]	Dec. 31, 2013 500 North Gulph Road [Member]	Dec. 31, 2013 741 First Avenue [Member]	Dec. 31, 2013 751-761 Fifth Avenue [Member]	Dec. 31, 2013 600 Park Avenue [Member]	Dec. 31, 2013 620 Allendale Road [Member]	Dec. 31, 2013 660 Allendale Road [Member]	Dec. 31, 2013 640 Allendale Road [Member]	Dec. 31, 2013 101 Lindenwood Drive [Member]	Dec. 31, 2013 301 Lindenwood Drive [Member]	Dec. 31, 2013 300 Lindenwood Drive [Member]	Dec. 31, 2013 100 Lindenwood Drive [Member]	Dec. 31, 2013 200 Lindenwood Drive [Member]	Dec. 31, 2013 14 Campus Boulevard [Member]	Dec. 31, 2013 11 Campus Boulevard [Member]	Dec. 31, 2013 17 Campus Boulevard [Member]	Dec. 31, 2013 15 Campus Boulevard [Member]	Dec. 31, 2013 18 Campus Boulevard [Member]	Dec. 31, 2013 401 Plymouth Road [Member]	Dec. 31, 2013 4000 Chemical Road [Member]	Dec. 31, 2013 610 West Germantown Pike [Member]	Dec. 31, 2013 600 West Germantown Pike [Member]	Dec. 31, 2013 630 West Germantown Pike [Member]	Dec. 31, 2013 620 West Germantown Pike [Member]	Dec. 31, 2013 660 West Germantown Pike [Member]	Dec. 31, 2013 2240/2250 Butler Pike [Member]	Dec. 31, 2013 2260 Butler Pike [Member]	Dec. 31, 2013 120 West Germantown Pike [Member]	Dec. 31, 2013 140 West Germantown Pike [Member]	Dec. 31, 2013 351 Plymouth Road [Member]	Dec. 31, 2013 150 Radnor Chester Road [Member]	Dec. 31, 2013 One Radnor Corporate Center [Member]	Dec. 31, 2013 201 King of Prussia Road [Member]	Dec. 31, 2013 555 Lancaster Avenue [Member]	Dec. 31, 2013 Four Radnor Corporate Center [Member]	Dec. 31, 2013 Five Radnor Corporate Center [Member]	Dec. 31, 2013 Three Radnor Corporate Center [Member]	Dec. 31, 2013 Two Radnor Corporate Center [Member]	Dec. 31, 2013 130 Radnor Chester Road [Member]	Dec. 31, 2013 170 Radnor Chester Road [Member]	Dec. 31, 2013 101 West Elm Street [Member]	Dec. 31, 2013 1 West Elm Street [Member]	Dec. 31, 2013 595 East Swedesford Road [Member]	Dec. 31, 2013 575 East Swedesford Road [Member]	Dec. 31, 2013 565 East Swedesford Road [Member]	Dec. 31, 2013 585 East Swedesford Road [Member]	Dec. 31, 2013 2970 Market Street [Member]	Dec. 31, 2013 2929 Arch Street [Member]	Dec. 31, 2013 1717 Arch Street [Member]	Dec. 31, 2013 2001 Market Street	Dec. 31, 2013 130 North 18th Street [Member]	Dec. 31, 2013 100 North 18th Street [Member]	Dec. 31, 2013 2930 Chestnut Street [Member]	Dec. 31, 2013 1900 Market [Member]	Dec. 31, 2013 3020 Market Street [Member]	Dec. 31, 2013 101-103 Juniper Street [Member]	Dec. 31, 2013 Philadelphia Marine Center [Member]	Dec. 31, 2013 11720 Beltsville Drive [Member]	Dec. 31, 2013 11700 Beltsville Drive [Member]	Dec. 31, 2013 11710 Beltsville Drive [Member]	Dec. 31, 2013 6600 Rockledge Drive [Member]	Dec. 31, 2013 11740 Beltsville Drive [Member]	Dec. 31, 2013 12015 Lee Jackson Memorial Highway [Member]	Dec. 31, 2013 11781 Lee Jackson Memorial Highway [Member]	Dec. 31, 2013 4401 Fair Lakes Court [Member]	Dec. 31, 2013 3141 Fairview Park Drive [Member]	Dec. 31, 2013 2340 Dulles Corner Boulevard [Member]	Dec. 31, 2013 2291 Wood Oak Drive [Member]	Dec. 31, 2013 196/198 Van Buren Street [Member]	Dec. 31, 2013 2251 Corporate Park Drive [Member]	Dec. 31, 2013 2355 Dulles Corner Boulevard [Member]	Dec. 31, 2013 2411 Dulles Corner Park [Member]	Dec. 31, 2013 13880 Dulles Corner Lane [Member]	Dec. 31, 2013 2121 Cooperative Way [Member]	Dec. 31, 2013 2201 Cooperative Way [Member]	Dec. 31, 2013 13825 Sunrise Valley Drive [Member]	Dec. 31, 2013 1676 International Drive [Member]	Dec. 31, 2013 8260 Greensboro Drive [Member]	Dec. 31, 2013 1880 Campus Commons Drive [Member]	Dec. 31, 2013 2273 Research Boulevard [Member]	Dec. 31, 2013 2275 Research Boulevard [Member]	Dec. 31, 2013 2277 Research Boulevard [Member]	Dec. 31, 2013 1900 Gallows Road [Member]	Dec. 31, 2013 8521 Leesburg Pike [Member]	Dec. 31, 2013 457 Haddonfield Road [Member]	Dec. 31, 2013 200 Lake Drive East [Member]	Dec. 31, 2013 220 Lake Drive East [Member]	Dec. 31, 2013 210 Lake Drive East [Member]	Dec. 31, 2013 20 East Clementon Road [Member]	Dec. 31, 2013 10 Foster Avenue [Member]	Dec. 31, 2013 7 Foster Avenue [Member]	Dec. 31, 2013 50 East Clementon Road [Member]	Dec. 31, 2013 2 Foster Avenue [Member]	Dec. 31, 2013 4 Foster Avenue [Member]	Dec. 31, 2013 1 Foster Avenue [Member]	Dec. 31, 2013 5 U.S. Avenue [Member]	Dec. 31, 2013 5 Foster Avenue [Member]	Dec. 31, 2013 1120 Executive Boulevard [Member]	Dec. 31, 2013 Two Eves Drive [Member]	Dec. 31, 2013 Five Eves Drive [Member]	Dec. 31, 2013 Four B Eves Drive [Member]	Dec. 31, 2013 Four A Eves Drive [Member]	Dec. 31, 2013 308 Harper Drive [Member]	Dec. 31, 2013 10000 Midlantic Drive [Member]	Dec. 31, 2013 700 East Gate Drive [Member]	Dec. 31, 2013 15000 Midlantic Drive [Member]	Dec. 31, 2013 1000 Howard Boulevard [Member]	Dec. 31, 2013 1000 Atrium Way [Member]	Dec. 31, 2013 2000 Midlantic Drive [Member]	Dec. 31, 2013 701 East Gate Drive [Member]	Dec. 31, 2013 9000 Midlantic Drive [Member]	Dec. 31, 2013 307 Fellowship Drive [Member]	Dec. 31, 2013 305 Fellowship Drive [Member]	Dec. 31, 2013 303 Fellowship Drive [Member]	Dec. 31, 2013 309 Fellowship Drive [Member]	Dec. 31, 2013 1000 Bishops Gate [Member]	Dec. 31, 2013 161 Gaither Drive [Member]	Dec. 31, 2013 815 East Gate Drive [Member]	Dec. 31, 2013 4000 Midlantic Drive [Member]	Dec. 31, 2013 817 East Gate Drive [Member]	Dec. 31, 2013 400 Commerce Drive [Member]	Dec. 31, 2013 100 Commerce Drive [Member]	Dec. 31, 2013 200 Commerce Drive [Member]	Dec. 31, 2013 Main Street-Plaza 1000 [Member]	Dec. 31, 2013 Main Street-Piazza [Member]	Dec. 31, 2013 Main Street-Promenade [Member]	Dec. 31, 2013 920 North King Street [Member]	Dec. 31, 2013 300 Delaware Avenue [Member]	Dec. 31, 2013 Two Righter Parkway [Member]	Dec. 31, 2013 One Righter Parkway [Member]	Dec. 31, 2013 4364 South Alston Avenue [Member]	Dec. 31, 2013 4805 Lake Brooke Drive [Member]	Dec. 31, 2013 Overlook I [Member]	Dec. 31, 2013 Overlook II [Member]	Dec. 31, 2013 2812 Emerywood Parkway [Member]	Dec. 31, 2013 300 Arboretum Place [Member]	Dec. 31, 2013 7501 Boulders View Drive [Member]	Dec. 31, 2013 7300 Beaufont Springs Drive [Member]	Dec. 31, 2013 6800 Paragon Place [Member]	Dec. 31, 2013 6802 Paragon Place [Member]	Dec. 31, 2013 1025 Boulders Parkway [Member]	Dec. 31, 2013 2100-2116 West Laburnam Avenue [Member]	Dec. 31, 2013 7401 Beaufont Springs Drive [Member]	Dec. 31, 2013 7325 Beaufont Springs Drive [Member]	Dec. 31, 2013 9011 Arboretum Parkway [Member]	Dec. 31, 2013 6806 Paragon Place [Member]	Dec. 31, 2013 9100 Arboretum Parkway [Member]	Dec. 31, 2013 2511 Brittons Hill Road [Member]	Dec. 31, 2013 100 Gateway Centre Parkway [Member]	Dec. 31, 2013 9200 Arboretum Parkway [Member]	Dec. 31, 2013 9210 Arboretum Parkway [Member]	Dec. 31, 2013 2201-2245 Tomlynn Street [Member]	Dec. 31, 2013 9211 Arboretum Parkway [Member]	Dec. 31, 2013 2221-2245 Dabney Road [Member]	Dec. 31, 2013 2212-2224 Tomlynn Street [Member]	Dec. 31, 2013 2244 Dabney Road [Member]	Dec. 31, 2013 2277 Dabney Road [Member]	Dec. 31, 2013 2248 Dabney Road [Member]	Dec. 31, 2013 2161-2179 Tomlynn Street [Member]	Dec. 31, 2013 2246 Dabney Road [Member]	Dec. 31, 2013 2251 Dabney Road [Member]	Dec. 31, 2013 2256 Dabney Road [Member]	Dec. 31, 2013 2130-2146 Tomlynn Street [Member]	Dec. 31, 2013 2120 Tomlynn Street [Member]	Dec. 31, 2013 2240 Dabney Road [Member]	Dec. 31, 2013 Boulders Land [Member]	Dec. 31, 2013 11305 Four Points Drive	Dec. 31, 2013 5900 & 5950 La Place Court [Member]	Dec. 31, 2013 5963 La Place Court [Member]	Dec. 31, 2013 2035 Corte Del Nogal [Member]	Dec. 31, 2013 1200 Concord Avenue [Member]	Dec. 31, 2013 1220 Concord Avenue [Member]	Dec. 31, 2013 155 Grand Avenue [Member]	Dec. 31, 2013 Two Kaiser Plaza [Member]	Dec. 31, 2013 Oakland Lot B [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances at December 31, 2012	$ 669,762				$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 190,964	$ 0	$ 0	$ 112,000	$ 0	$ 88,583	$ 40,101	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 21,630	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 59,698	$ 31,697	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Initial Cost [Abstract]
Land	634,189				2,657	2,206	2,611	2,595	1,533	2,086	1,180	1,781	1,695	3,304	1,671	1,209	6,927	1,689	4,241	1,399	1,303	4,222	4,486	2,836	2,770	2,772	2,712	2,773	2,860	2,168	2,017	1,916	1,303	1,287	1,097	1,012	1,020	396	439	4,152	2,729	848	473	324	2,244	1,112	1,108	1,164	787	6,198	4,373	3,651	3,652	3,558	3,572	0	1,104	661	685	481	1,043	11,925	7,323	8,956	8,014	5,406	6,506	4,773	3,937	2,573	2,514	6,251	3,557	2,729	2,178	1,872	1,350	22,430	0	0	15,323	14,496	16,066	0	7,768	0	0	532	3,831	2,808	2,278	0	198	3,770	3,246	1,569	5,918	16,345	8,243	7,931	11,472	10,365	7,279	7,236	5,598	4,809	3,794	18,437	7,952	6,164	5,167	5,059	4,649	7,797	4,316	2,142	2,069	2,144	1,645	769	244	231	114	185	183	93	21	9	2,074	818	703	588	539	1,643	3,206	3,569	3,061	2,297	2,061	2,202	1,736	1,472	1,565	1,421	1,493	1,518	934	1,016	636	714	611	2,528	1,160	911	2,732	696	531	6,141	6,368	2,802	2,545	1,622	1,640	748	748	1,069	5,450	4,669	4,672	4,552	2,917	2,574	2,482	2,349	2,344	1,857	0	1,362	1,202	391	985	1,110	1,020	582	530	502	550	507	512	423	455	387	356	353	281	264	1,256	962	3,706	2,824	3,261	6,395	6,476	13,556	7,841	4,342
Buildings and Improvements	3,454,900				4,462	13,422	10,445	11,809	9,460	8,342	7,290	7,124	6,779	16,960	6,606	6,595	14,722	6,756	16,579	5,629	5,188	16,891	17,943	4,028	11,014	10,936	10,953	11,144	11,282	8,576	8,070	4,378	5,201	5,151	4,391	4,048	3,839	948	432	16,606	10,915	3,394	1,892	1,295	4,217	4,067	5,155	3,896	3,312	16,131	24,546	14,514	15,288	14,743	14,435	0	4,627	2,727	2,773	1,976	555	36,986	28,613	29,811	16,508	21,390	25,525	17,961	15,484	8,338	8,147	25,209	14,249	10,917	8,712	7,489	5,401	217,763	208,570	98,188	120,842	107,736	100,255	76,008	17,263	21,417	14,401	2,196	16,661	12,081	11,100	37,421	870	22,895	19,836	11,982	40,981	65,379	52,413	43,812	45,893	43,876	46,340	39,213	38,639	34,093	19,365	97,538	33,964	28,114	31,110	29,668	26,952	47,817	30,885	9,120	8,275	8,798	6,579	3,055	971	921	964	730	726	364	81	32	8,415	3,461	2,819	2,369	2,168	6,663	12,857	14,436	12,254	9,288	8,180	8,823	6,877	5,895	6,342	5,768	6,055	6,154	6,287	4,064	2,584	5,085	2,426	9,220	4,633	4,414	10,942	2,802	2,052	21,140	13,739	11,217	10,195	6,419	6,567	3,976	4,492	4,281	21,892	19,699	19,689	18,414	11,454	11,297	8,846	10,396	10,377	7,702	10,288	5,489	4,820	5,410	3,973	4,474	4,067	2,433	2,123	2,014	2,203	2,034	2,049	1,695	1,822	1,552	1,427	1,416	1,125	1,059	0	35,894	11,185	9,413	6,077	24,664	24,966	54,267	0	0
Net Improvements (Retirements) Since Acquisition	617,057				13,711	4,176	5,046	3,533	2,255	2,628	2,173	1,412	1,267	(110)	759	(528)	634	395	2,630	5,214	3,228	3,450	1,330	12,223	3,755	2,787	2,728	1,971	586	4,522	2,369	1,771	1,548	11	31	385	654	2,957	1,579	3,722	2,667	1,265	208	339	1,515	672	(397)	228	(183)	17,096	3,292	3,299	2,064	1,770	1,607	17,488	1,333	1,242	961	160	0	11,799	22,975	5,214	18,993	11,967	5,124	2,715	3,872	3,491	1,678	2,784	1,115	2,307	1,681	1,820	116	10,591	29,291	52,953	(642)	11,782	6,038	2,586	64	3,010	324	3,196	3,982	292	(814)	11,538	42	3,665	24	237	11,545	18,280	13,499	8,709	2,055	4,528	3,508	2,498	2,292	2,349	1,032	2,501	1,794	6,315	3,589	2,964	695	9,619	3,198	1,334	1,299	646	1,110	530	78	123	3	16	5	76	3	26	2,061	341	532	420	123	929	4,335	2,094	1,600	3,922	4,867	2,490	1,780	1,880	1,292	1,611	851	644	412	679	708	(1,982)	152	1,048	857	1,018	3,074	2,529	445	2,485	2,546	6,264	5,088	1,031	1,136	600	77	505	3,457	2,112	1,906	2,020	2,912	1,573	2,707	992	503	906	(105)	761	1,221	616	1,225	527	793	886	349	395	37	241	131	315	18	110	235	169	179	98	28	36,856	3,401	2,197	1,175	809	260	5,764	0	0
Carrying Amount at Which Carried [Abstract]
Land	680,513				2,657	2,206	2,611	2,595	1,533	2,086	1,180	2,088	1,695	3,303	1,671	1,209	6,927	1,689	4,241	1,399	1,303	4,222	4,486	2,636	2,770	2,772	2,712	2,773	2,860	2,168	2,017	1,916	1,303	1,287	1,097	1,012	1,020	1,085	439	4,152	2,729	848	473	324	2,244	1,112	1,108	1,164	787	6,198	4,373	3,651	3,652	3,558	3,572	0	1,104	661	685	481	1,043	11,896	7,322	8,948	8,609	5,705	6,578	4,791	3,942	2,567	2,509	6,251	3,557	2,729	2,178	1,872	1,350	22,430	12,482	25,195	15,323	14,473	16,066	0	7,768	0	478	628	3,903	2,863	2,321	0	202	3,842	3,307	1,599	7,081	16,129	8,782	8,348	11,472	10,365	7,417	7,373	5,795	4,809	3,866	18,785	8,102	6,281	5,237	5,154	4,733	7,944	4,397	2,142	2,069	2,144	1,645	769	244	231	114	185	183	93	21	9	2,074	818	703	588	539	1,643	3,206	3,569	3,061	2,297	2,061	2,202	1,736	1,472	1,565	1,421	1,493	1,518	934	1,016	636	714	611	2,528	1,160	911	2,732	696	531	6,141	6,368	2,802	2,545	1,580	1,640	790	790	1,069	5,450	4,925	4,922	4,552	2,917	2,824	2,482	2,599	2,594	1,857	403	1,362	1,202	391	985	1,110	1,020	582	530	502	550	507	512	423	455	387	356	353	281	264	1,259	962	3,955	2,999	3,499	6,515	6,476	13,557	7,841	4,342
Buildings and Improvements	3,988,776				18,172	17,598	15,490	15,341	11,714	10,969	9,462	8,228	8,046	16,850	7,364	6,068	15,357	7,152	19,209	10,843	8,416	20,341	19,273	16,450	14,770	13,723	13,681	13,115	11,868	13,098	10,440	6,149	6,749	5,162	4,422	4,433	4,493	3,216	2,012	20,329	13,582	4,659	2,100	1,634	5,733	4,739	4,758	4,125	3,129	33,226	27,838	17,813	17,352	16,513	16,042	17,488	5,960	3,969	3,735	2,135	555	48,813	51,588	35,032	34,906	33,058	30,577	20,658	19,350	11,834	9,831	27,992	15,364	13,225	10,393	9,309	5,517	228,354	225,380	125,946	120,200	119,541	106,293	78,594	17,327	24,427	14,247	5,296	20,571	12,319	10,243	48,960	908	26,489	19,800	12,190	51,365	83,875	65,373	52,104	47,948	48,405	49,710	41,574	40,734	36,442	20,326	99,691	35,608	34,312	34,628	32,537	27,563	57,288	34,002	10,454	9,573	9,443	7,689	3,585	1,049	1,044	967	746	732	440	84	58	10,475	3,802	3,351	2,789	2,291	7,592	17,192	16,530	13,854	13,210	13,047	11,313	8,657	7,776	7,634	7,378	6,907	6,798	6,700	4,743	3,292	3,103	2,578	10,268	5,490	5,432	14,016	5,332	2,496	23,625	16,285	17,481	15,282	7,491	7,703	4,533	4,526	4,786	25,349	21,555	21,345	20,434	14,366	12,620	11,553	11,138	10,629	8,609	9,780	6,250	6,041	6,027	5,198	5,001	4,860	3,320	2,472	2,409	2,240	2,274	2,181	2,010	1,840	1,662	1,662	1,585	1,304	1,157	25	35,894	14,337	11,435	7,015	25,352	25,226	60,031	0	0
Total	4,669,289	4,726,169	4,793,080	4,834,111	20,829	19,804	18,101	17,936	13,247	13,055	10,642	10,316	9,741	20,153	9,035	7,277	22,284	8,841	23,450	12,242	9,719	24,563	23,759	19,086	17,540	16,495	16,393	15,888	14,728	15,266	12,457	8,065	8,052	6,449	5,519	5,445	5,513	4,301	2,451	24,481	16,311	5,507	2,573	1,958	7,977	5,851	5,866	5,289	3,916	39,424	32,211	21,464	21,004	20,071	19,614	17,488	7,064	4,630	4,420	2,616	1,598	60,709	58,910	43,980	43,515	38,763	37,155	25,449	23,292	14,401	12,340	34,243	18,921	15,954	12,571	11,181	6,867	250,784	237,862	151,141	135,523	134,014	122,359	78,594	25,095	24,427	14,725	5,924	24,474	15,182	12,564	48,960	1,110	30,331	23,107	13,789	58,446	100,004	74,155	60,452	59,420	58,770	57,127	48,947	46,529	41,251	24,192	118,476	43,710	40,593	39,865	37,691	32,296	65,232	38,399	12,596	11,642	11,587	9,334	4,354	1,293	1,275	1,081	931	915	533	105	67	12,549	4,620	4,054	3,377	2,830	9,235	20,398	20,099	16,915	15,507	15,108	13,515	10,393	9,248	9,199	8,799	8,400	8,316	7,634	5,759	3,928	3,817	3,189	12,796	6,650	6,343	16,748	6,028	3,027	29,766	22,653	20,283	17,827	9,071	9,343	5,323	5,316	5,855	30,799	26,480	26,267	24,986	17,283	15,444	14,035	13,737	13,223	10,466	10,183	7,612	7,243	6,418	6,183	6,111	5,880	3,902	3,002	2,911	2,790	2,781	2,693	2,433	2,295	2,049	2,018	1,938	1,585	1,421	1,284	36,856	18,292	14,434	10,514	31,867	31,702	73,588	7,841	4,342
Accumulated Depreciation at December 31, 2013	$ 983,808	$ 954,665	$ 865,710	$ 776,078	$ 5,478	$ 8,004	$ 7,264	$ 5,464	$ 5,246	$ 3,113	$ 4,241	$ 2,491	$ 2,275	$ 6,542	$ 3,265	$ 2,898	$ 217	$ 3,259	$ 7,560	$ 3,818	$ 3,577	$ 8,747	$ 6,143	$ 5,264	$ 7,286	$ 5,949	$ 6,016	$ 5,856	$ 4,859	$ 5,999	$ 4,388	$ 2,722	$ 3,151	$ 2,242	$ 1,917	$ 1,925	$ 1,869	$ 623	$ 722	$ 6,569	$ 4,424	$ 1,889	$ 729	$ 557	$ 2,984	$ 1,812	$ 1,519	$ 1,267	$ 1,525	$ 10,394	$ 5,628	$ 5,285	$ 5,119	$ 5,462	$ 5,140	$ 688	$ 3,324	$ 2,052	$ 1,812	$ 1,017	$ 121	$ 15,790	$ 15,805	$ 13,938	$ 12,970	$ 12,752	$ 6,918	$ 7,226	$ 6,031	$ 3,825	$ 3,316	$ 6,556	$ 3,626	$ 3,946	$ 3,255	$ 2,840	$ 1,397	$ 21,169	$ 74,828	$ 12,294	$ 107	$ 37,538	$ 32,227	$ 6,606	$ 629	$ 2,144	$ 1,340	$ 2,186	$ 5,743	$ 2,415	$ 2,096	$ 12,867	$ 189	$ 6,016	$ 4,092	$ 2,202	$ 9,049	$ 24,559	$ 11,311	$ 8,594	$ 8,434	$ 10,863	$ 10,475	$ 6,634	$ 6,598	$ 5,921	$ 3,521	$ 17,693	$ 6,461	$ 5,754	$ 8,658	$ 6,474	$ 5,014	$ 9,483	$ 5,192	$ 4,884	$ 3,264	$ 3,152	$ 2,509	$ 1,574	$ 470	$ 435	$ 428	$ 333	$ 324	$ 219	$ 37	$ 27	$ 4,687	$ 1,795	$ 1,519	$ 1,328	$ 1,050	$ 3,155	$ 7,087	$ 7,269	$ 6,211	$ 5,277	$ 5,896	$ 4,752	$ 3,452	$ 3,142	$ 3,189	$ 2,831	$ 2,902	$ 2,927	$ 2,350	$ 1,719	$ 1,353	$ 1,455	$ 1,088	$ 3,627	$ 2,381	$ 2,012	$ 9,611	$ 1,415	$ 1,097	$ 6,854	$ 5,836	$ 4,069	$ 7,982	$ 3,010	$ 2,953	$ 439	$ 475	$ 2,017	$ 10,047	$ 4,030	$ 3,534	$ 4,057	$ 4,666	$ 2,100	$ 4,917	$ 1,904	$ 1,753	$ 3,571	$ 2,297	$ 2,591	$ 2,652	$ 1,725	$ 2,136	$ 2,151	$ 1,944	$ 1,206	$ 889	$ 938	$ 947	$ 889	$ 898	$ 764	$ 770	$ 703	$ 746	$ 636	$ 560	$ 451	$ 0	$ 0	$ 3,015	$ 2,164	$ 1,902	$ 6,693	$ 6,375	$ 11,951	$ 0	$ 0
Depreciable Life (Years)					40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	30 years	40 years	40 years	40 years	40 years	40 years	29 years	29 years	25 years	24 years	30 years	38 years	29 years	29 years	25 years	25 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	34 years	36 years	40 years	30 years	26 years	40 years	40 years	46 years	46 years	46 years	50 years	46 years	42 years	40 years	52 years	51 years	40 years	55 years	53 years	40 years	40 years	50 years	55 years	54 years	54 years	46 years	55 years	52 years	52 years	45 years	45 years	45 years	52 years	51 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	30 years	23 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years		40 years	48 years	55 years	39 years	34 years	34 years	40 years

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Distributions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividends, Common Stock [Abstract]
Common Share Distributions Payments of Ordinary Dividends	$ 0.52	$ 0.39	$ 0.37
Common Share Distributions Capital Gain	$ 0.00	$ 0.00	$ 0.00
Common Share Distributions Non-taxable Distributions	$ 0.08	$ 0.21	$ 0.23
Common Stock, Dividends, Per Share, Declared	$ 0.60	$ 0.60	$ 0.60
Percentage Of Distributions classified as ordinary income	87.00%	65.00%	61.67%
Percentage Of Distributions classified as capital gain	0.00%	0.00%	0.00%
Percentage Of Distributions classified as non-taxable distribution	13.00%	35.00%	38.33%
Dividends, Preferred Stock	$ 6,900	$ 10,405	$ 7,992
Percentage Of Preferred Distributions classified as ordinary income	100.00%	100.00%	100.00%

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Share Based and Deferred Compensation (Details Textuals) (USD $)	12 Months Ended									3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Option [Member]	Dec. 31, 2012 Stock Option [Member]	Dec. 31, 2011 Stock Option [Member]	Dec. 31, 2013 Restricted Share Awards [Member]	Dec. 31, 2012 Restricted Share Awards [Member]	Dec. 31, 2011 Restricted Share Awards [Member]	Dec. 31, 2013 Restricted Performance Share Units Plan [Member] Employees	Dec. 31, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2011 Restricted Performance Share Units Plan [Member]	Dec. 31, 2013 Restricted Performance Share Units Plan [Member] Age Employees	Dec. 31, 2012 Restricted Performance Share Units Plan [Member]	Dec. 31, 2011 Restricted Performance Share Units Plan [Member]	Dec. 31, 2013 Employee Share Purchase Plan [Member]	Dec. 31, 2012 Employee Share Purchase Plan [Member]	Dec. 31, 2011 Employee Share Purchase Plan [Member]	Dec. 31, 2013 Deferred Compensation Plan [Member]	Dec. 31, 2012 Deferred Compensation Plan [Member]	Dec. 31, 2011 Deferred Compensation Plan [Member]	Dec. 31, 2013 Executive Officer [Member] Restricted Share Awards [Member]	Feb. 25, 2013 Executive Officer [Member] Restricted Share Awards [Member]	Feb. 25, 2013 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 01, 2012 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 02, 2011 Executive Officer [Member] Restricted Performance Share Units Plan [Member]
Share Based and Deferred Compensation (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,983,569.000	3,337,549		2,983,569
Unrecognized compensation expenses				$ 100,000			$ 1,900,000
Weighted average period over which options will be recognized				0 years 2 months 20 days			1 year 1 month 21 days
Stock-based compensation expense, capitalized	1,400,000	2,600,000	1,500,000	100,000	500,000	400,000	600,000	900,000	700,000	800,000			1,200,000		500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number							563,713	597,708
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							three to seven years from the initial grant date
Award vesting term, minimum	1 year						3 years
Award vesting term, maximum	10 years						7 years
Stock-based compensation expense	8,300,000	8,600,000	6,400,000	700,000	1,600,000	1,400,000	3,200,000	3,400,000	3,200,000	4,400,000	1,700,000		3,500,000			100,000	100,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date																15.00%
Vesting Period, Minimum	3 years												3 years
Aggregate share-based awards awarded to executives																1,250,000							157,208	231,093	242,122	113,256
Stock Issued During Period, Value, Employee Stock Purchase Plan																300,000	400,000
Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vesting, Minimum							3 years
Voluntary termination of employment terms							after reaching age 57 and accumulating at least 15 years of service with the Company						after reaching age 57 and accumulating at least 15 years of service with the Company
Age limit of voluntary termination of employment													57									57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	236,318
Accumulated Service Period For Voluntary Termination							15 years						15 years
Maximum percentage of the participant's base units													200.00%
Fair value of awards on the grant date												2,000,000	4,100,000	4,100,000
Number of executives with employment agreements										2			2
Share purchases made by employees under ESPP																85% of the average closing price per share for a specified period
Share purchases made by employees under ESPP, Percentage																		85.00%
Percentage of plan contribution																20.00%
Amount of participant contribution																50,000
Deferred Compensation Arrangement With Individual Decrease In Compensation Expense																			200,000		100,000
Deferred compensation arrangement with individual increase in compensation expense.																				300,000
Number of shares to be issued under deferred compensation plan included in total shares outstanding																			300,000	300,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 400,000

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Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 20, 2014	Jun. 28, 2013
Entity Registrant Name	BRANDYWINE REALTY TRUST
Entity Central Index Key	0000790816
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q4
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,091,192,105
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		156,738,955
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Registrant Name	BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Central Index Key	0001060386
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q4
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer

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Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company determined the fair values disclosed below using available market information and discounted cash flow analyses as of December 31, 2013 and 2012, respectively. The discount rate used in calculating fair value is the sum of the current risk free rate and the risk premium on the date of measurement of the instruments or obligations. Considerable judgment is necessary to interpret market data and to develop the related estimates of fair value. Accordingly, the estimates presented are not necessarily indicative of the amounts that the Company could realize upon disposition. The use of different estimation methodologies may have a material effect on the estimated fair value amounts shown. The Company believes that the carrying amounts reflected in the consolidated balance sheets at December 31, 2013 and 2012 approximate the fair values for cash and cash equivalents, accounts receivable, other assets, accounts payable and accrued expenses.

The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands):

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Mortgage notes payable	$	669,762	$	715,244	$	443,942	$	486,412
Unsecured notes payable	$	1,401,093	$	1,471,041	$	1,430,343	$	1,553,123
Variable rate debt	$	528,610	$	526,693	$	597,610	$	595,693
Notes receivable	$	7,026	$	7,759	$	7,226	$	7,783

The fair value of the Company's unsecured notes payable is categorized at a Level 2 basis (as provided by the accounting standard for Fair Value Measurements and Disclosures). This is because the Company valued these instruments using quoted market prices as of December 31, 2013 and 2012. For the fair value of the Company's unsecured notes, the Company uses a discount rate based on the indicative new issue pricing provided by lenders.

The fair value of the Company's mortgage notes payable, variable rate debt and notes receivable are all categorized at a Level 3 basis (as provided by the accounting standard for Fair Value Measurements and Disclosures). The fair value of the variable rate debt was estimated using a discounted cash flow analysis valuation on the borrowing rates currently available to the Company for loans with similar terms and maturities, as applicable. The fair value of the mortgage debt was determined by discounting the future contractual interest and principal payments by a blended market rate for loans with similar terms, maturities and loan-to-value. The fair value of the notes receivable was determined by using the expected cash flows of the notes receivable, and discounting those cash flows using the market rate of interest for mortgage notes with a comparable level of risk. These financial instruments have been categorized as Level 3 because the Company considers the rates used in the valuation techniques to be unobservable inputs.

For the Company's mortgage loans, the Company uses an estimate based on its knowledge of the mortgage market. The weighted average discount rate for the combined variable rate debt and mortgage loans used as of December 31, 2013 was 4.534%. An increase in the discount rate used in the discounted cash flow model would result in a decrease to the fair value of the Company's long-term debt. Conversely, a decrease in the discount rate used in the discounted cash flow model would result in an increase to the fair value of the Company's long-term debt.

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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Company's estimates of fair value differ from the carrying amounts
Mortgage notes payable, Carrying Amount	$ 669,762	$ 443,942
Mortgage notes payable, Fair Value	715,244	486,412
Unsecured notes payable, Carrying Amount	1,401,093	1,430,343
Unsecured notes payable, Fair Value	1,471,041	1,553,123
Variable rate debt instruments, Carrying Amount	528,610	597,610
Variable rate debt instruments, Fair Value	526,693	595,693
Notes receivable, Carrying Amount	7,026	7,226
Notes receivable, Fair Value	$ 7,759	$ 7,783

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Share Based and Deferred Compensation (Restricted Share Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Age	Dec. 31, 2012
Restricted Share Awards [Member]
Company's restricted share activity
Non-vested at January 1, 2012, shares	597,708
Non-vested at January 1, 2012, Weighted Average Grant Date Fair value	$ 12.57
Granted, shares	182,576
Granted, Weighted Average Grant Date Fair value	$ 13.13
Vested, shares	(208,306)
Vested, Weighted Average Grant Date Fair value	$ 13.13
Forfeited, shares	(8,265)
Forfeited, Weighted Average Grant Date Fair Value	$ 11.41
Non-vested at December 31, 2012, shares	563,713
Non-vested at December 31, 2012, Weighted Average Grant Date Fair value	$ 12.56
Restricted Performance Share Units Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age limit of voluntary termination of employment	57
Company's restricted share activity
Vested, shares		(64,678)
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	15 years
Executive Officer [Member] | Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age limit of voluntary termination of employment	57
Company's restricted share activity
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	15 years

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Preferred Stock, Value, Issued	$ 40	$ 40
Brandywine Realty Trust's equity:
Preferred shares, shares authorized	20,000,000	20,000,000
Preferred shares, dividend rate (as a percent)	6.90%
Preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares, shares issued	4,000,000	4,000,000
Preferred shares, shares outstanding	4,000,000	4,000,000
Common shares in grantor trust	$ 0.01	$ 0.01
Common shares of Brandywine Realty Trust's beneficial interest, shares authorized	200,000,000	200,000,000
Common shares of Brandywine Realty Trust's beneficial interest, shares issued	156,703,790	143,538,733
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding	156,703,790	143,538,733
Common shares in grantor trust	313,023	290,745
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Preferred Stock, Value, Issued	$ 96,850	$ 96,850
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	6.90%
Preferred shares, shares issued	4,000,000	4,000,000
Preferred shares, shares outstanding	4,000,000	4,000,000
Redeemable Limited Partnership, units issued	1,763,739	1,845,737
Redeemable Limited Partnership, units outstanding	1,763,739	1,845,737
General Partners' Capital account, units issued	156,703,790	143,538,733
General Partners' Capital account, units outstanding	156,703,790	143,538,733

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Reclassifications

Certain amounts have been reclassified in prior years to conform to the current year presentation. The reclassifications are related to the treatment of sold properties as discontinued operations on the statement of operations for all periods presented. In addition, capital expenditures included in investing activities were disaggregated on the statement of cash flows for all periods presented to the following; (i) capital expenditures for tenant improvements, (ii) capital expenditures for redevelopment projects and (iii) capital expenditures for development projects.

Principles of Consolidation

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity (“VIE”), and if the Company is deemed to be the primary beneficiary, in accordance with the accounting standard for the consolidation of variable interest entities. The accounting standard for the consolidation of VIEs requires the Company to qualitatively assess if the Company was the primary beneficiary of the VIEs based on whether the Company had (i) the power to direct those matters that most significantly impacted the activities of the VIE and (ii) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. For entities determined to be VIEs, but for which the Company is not the primary beneficiary, the Company's maximum exposure to loss is the carrying amount of its investments. As of December 31, 2013, the Company has provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII.

When an entity is not deemed to be a VIE, the Company considers the provisions of the same accounting standard to determine whether a general partner/managing member, or the general partners/managing members as a group, controls a limited partnership or similar entity when the limited partners/non-managing members have certain rights. The Company consolidates (i) entities that are VIEs and of which the Company is deemed to be the primary beneficiary and (ii) entities that are non-VIEs and controlled by the Company and in which the limited partners neither have the ability to dissolve the entity or remove the Company without cause nor any substantive participating rights.  Entities that the Company accounts for under the equity method (i.e., at cost, increased or decreased by the Company's share of earnings or losses, plus contributions, less distributions) include (i) entities that are VIEs and of which the Company is not deemed to be the primary beneficiary (ii) entities that are non-VIEs which the Company does not control, but over which the Company has the ability to exercise significant influence and (iii) entities that are non-VIEs for which the Company maintains an ownership interest through its general partner/managing member status, but the limited partners/non-managing members in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights.  Currently there are no real estate ventures that a limited partner/non-managing member has the unilateral right to dissolve. The Company continuously assesses its determination of whether an entity is a VIE and who the primary beneficiary is, and whether or not the limited partners/non-managing members in an entity have substantive rights, more particularly if certain events occur that are likely to cause a change in the original determinations. The Company's assessment includes a review of applicable documents such as, but not limited to, applicable partnership agreements, LLC and other real estate venture agreements and management and leasing agreements to determine whether the Company has control to direct the business activities of the entities. The portion of the consolidated entities that is not owned by the Company is presented as non-controlling interest as of and during the periods consolidated. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Management makes significant estimates regarding revenue, valuation of real estate and related intangible assets and liabilities, impairment of long-lived assets, allowance for doubtful accounts and deferred costs.

Operating Properties

Operating properties are carried at historical cost less accumulated depreciation and impairment losses. The cost of operating properties reflects their purchase price or development cost. Acquisition costs related to business combinations are expensed as incurred, whereas the costs related to asset acquisitions are capitalized as incurred. Costs incurred for the renovation and betterment of an operating property are capitalized to the Company’s investment in that property. 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. Fully-depreciated assets are removed from the accounts.

Purchase Price Allocation

The Company allocates the purchase price of properties considered to be business combinations to net tangible and identified intangible assets acquired based on fair values. Above-market and below-market in-place lease values for acquired properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) the Company’s estimate of the fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease (including the below market fixed renewal period, if applicable). Capitalized above-market lease values are amortized as a reduction of rental income over the remaining non-cancelable terms of the respective leases. Capitalized below-market lease values are amortized as an increase to rental income over the remaining non-cancelable terms of the respective leases, including any below market fixed-rate renewal periods.

Other intangible assets also include in-place leases based on the Company’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. The Company estimates the cost to execute leases with terms similar to the remaining lease terms of the in-place leases, including leasing commissions, legal and other related expenses. This intangible asset is amortized to expense over the remaining term of the respective leases and any fixed-rate bargain renewal periods. Company estimates of value are made using methods similar to those used by independent appraisers or by using independent appraisals. Factors considered by the Company in this analysis include an estimate of the carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, which primarily range from four to twelve months. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired. The Company also uses the information obtained as a result of its pre-acquisition due diligence as part of its consideration of the accounting standard governing asset retirement obligations and when necessary, will record a conditional asset retirement obligation as part of its purchase price. Though the Company considers the value of tenant relationships, the amounts are determined on a tenant-specific basis. On certain of our acquisitions this intangible has been deemed immaterial. In these instances no related intangible value is assigned.

In the event that a tenant terminates its lease, the unamortized portion of each intangible, including in-place lease values and tenant relationship values, is charged to expense and market rate adjustments (above or below) are recorded to revenue.

Depreciation and Amortization

The costs of buildings and improvements are depreciated using the straight-line method based on the following useful lives: buildings and improvements (five to 55 years) and tenant improvements (the shorter of the lease term or the life of the asset).

The Company's 2011 consolidated statement of operations contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million in 2011. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error during 2011 was not material to the Company's consolidated financial statements, the Company recorded the related adjustment during 2011.

Construction in Progress

Project costs directly associated with the development and construction of a real estate project are capitalized as construction in progress. Construction in progress also includes costs related to ongoing tenant improvement projects. In addition, interest, real estate taxes and other expenses that are directly associated with the Company’s development activities are capitalized until the property is placed in service. Internal direct costs are capitalized to projects in which qualifying expenditures are being incurred. Internal direct construction costs totaling $3.7 million in 2013, $4.7 million in 2012, $4.0 million in 2011 and interest totaling $2.6 million in 2013, $2.6 million in 2012, and $2.0 million in 2011 were capitalized related to development of certain properties and land holdings.

During the years ended December 31, 2013, 2012 and 2011, the Company's internal direct construction costs are comprised entirely of capitalized salaries. The following table shows the amount of compensation costs (including bonuses and benefits) capitalized for the years presented (in thousands):

	December 31,
	2013		2012		2011
Development	$	156	$	57	$	—
Redevelopment	194		353		—
Tenant Improvements	3,323		4,259		4,034
Total	$	3,673	$	4,669	$	4,034

Impairment or Disposal of Long-Lived Assets

The Company reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of an asset is not recoverable and exceeds its fair value. In such case, an impairment loss is recognized in the amount of the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our holding strategy were to change or if market conditions were to otherwise dictate an earlier sale date, then an impairment loss may be recognized and such loss could be material. If we determine that impairment has occurred, the affected assets must be reduced to their fair value.

The relevant accounting guidance for impairments requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and if we will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally consider assets to be “held for sale” when the transaction has been approved by our Board of Trustees, or by officers vested with authority to approve the transaction and there are no known significant contingencies relating to the sale of the property within one year of the consideration date and the consummation of the transaction is otherwise considered probable.

Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value.

The Company determined during its impairment review of the year-ended December 31,2013, 2012 and 2011, that no impairment charges were necessary.

Cash and Cash Equivalents

Cash and cash equivalents are highly-liquid investments with original maturities of three months or less. The Company maintains cash equivalents in financial institutions in excess of insured limits, but believes this risk is mitigated by only investing in or through major financial institutions.

Restricted Cash

Restricted cash consists of cash held as collateral to provide credit enhancement for the Company’s mortgage debt, cash for property taxes, capital expenditures and tenant improvements.

Accounts Receivable and Accrued Rent Receivable

Leases with tenants are accounted for as operating leases. Minimum annual rentals under tenant leases are recognized on a straight-line basis over the term of the related lease. The cumulative difference between lease revenue recognized under the straight-line method and contractual lease payment terms is recorded as “accrued rent receivable, net” on the accompanying balance sheets. Included in current tenant receivables are tenant reimbursements which are comprised of amounts recoverable from tenants for common area maintenance expenses and certain other recoverable expenses that are recognized as revenue in the period in which the related expenses are incurred. As of December 31, 2013 and 2012, no tenant represented more than 10% of accounts receivable and accrued rent receivable.

Tenant receivables and accrued rent receivables are carried net of the allowances for doubtful accounts of $3.2 million and $13.0 million in 2013, respectively and $3.1 million and $13.5 million in 2012, respectively. The allowance is an estimate based on two calculations that are combined to determine the total amount reserved. First, the Company evaluates specific accounts where it has determined that a tenant may have an inability to meet its financial obligations. In these situations, the Company uses its judgment, based on the facts and circumstances, and records a specific reserve for that tenant against amounts due to reduce the receivable to the amount that the Company expects to collect. These reserves are reevaluated and adjusted as additional information becomes available. Second, a reserve is established for all tenants based on a range of percentages applied to receivable aging categories for tenant receivables. For accrued rent receivables, the Company considers the results of the evaluation of specific accounts and also considers other factors including assigning risk factors to different industries based on its tenants SIC classification. Considering various factors including assigning a risk factor to different industries, these percentages are based on historical collection and write-off experience adjusted for current market conditions, which requires management’s judgments.

Investments in Unconsolidated Real Estate Ventures

The Company accounts for its investments in unconsolidated Real Estate Ventures under the equity method of accounting as it is not the primary beneficiary (for VIEs) and the Company exercises significant influence, but does not control these entities under the provisions of the entities’ governing agreements pursuant to the accounting standard for the consolidation of VIEs. When the Company determines that its investment in an unconsolidated Real Estate Venture does not constitute a VIE, the Company utilizes the voting interest model under the accounting standard for consolidation to determine whether to consolidate the venture.

Under the equity method, investments in unconsolidated Real Estate Ventures are recorded initially at cost, as investments in Real Estate Ventures, and subsequently adjusted for equity in earnings, cash contributions, less distributions and impairments. On a periodic basis, management also assesses whether there are any indicators that the value of the Company’s investments in unconsolidated Real Estate Ventures may be other than temporarily impaired. An investment is impaired only if the value of the investment, as estimated by management, is less than the carrying value of the investment and the decline is other than temporary. To the extent that an impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

When the Company acquires an interest in or contributes assets to a real estate venture project, the difference between the Company’s cost basis in the investment and the value of the real estate venture or asset contributed is amortized over the life of the related assets, intangibles and liabilities and such adjustment is included in the Company’s share of equity in income of unconsolidated Real Estate Ventures. For purposes of cash flow presentation, distributions from unconsolidated Real Estate Ventures are presented as part of operating activities when they are considered as return on investments. Distributions in excess of the Company’s share in the cumulative unconsolidated Real Estate Ventures’ earnings are considered as return of investments and are presented as part of investing activities in accordance with the accounting standard for cash flow presentation.

Deferred Costs

Costs incurred in connection with property leasing are capitalized as deferred leasing costs. Deferred leasing costs consist primarily of leasing commissions and internal leasing costs that are amortized using the straight-line method over the life of the respective lease which generally ranges from one to 15 years. Management re-evaluates the remaining useful lives of leasing costs as economic and market conditions change.

Costs incurred in connection with debt financing are capitalized as deferred financing costs and charged to interest expense over the terms of the related debt agreements. Deferred financing costs consist primarily of loan fees which are amortized over the related loan term on a basis that approximates the effective interest method. Deferred financing costs are accelerated, when debt is extinguished, as part of interest expense- amortization of deferred financing costs within the Company's consolidated statements of operations. Original issue discounts are recognized as part of the gain or loss on extinguishment of debt, as appropriate.

Notes Receivable

As of December 31, 2013 and 2012, notes receivable included a purchase money mortgage with a 20-year amortization period bearing interest at 8.5%, which was valued at $7.0 million and $7.2 million, respectively. The borrower had previously defaulted on the note. As a result, a forbearance agreement dated October 2011, as amended by a second forbearance agreement dated July 9, 2013, was entered into between the Company and the borrower, outlining the repayment terms of the outstanding debt. The Company has determined that the loan modifications represent a troubled debt restructuring due to the fact that the borrower was considered to be in a financial difficulty when it defaulted on the mortgage debt, and that a concession was granted in the form of the forbearance agreements. In accordance with the accounting standard for loan receivables the Company performs, on an ongoing basis, a collectability assessment of the note using the expected cash flow information provided by the borrower. Based on settlements subsequent to the balance sheet date and future cash flow projections provided by the borrower, it is anticipated that the note will be fully paid during 2015. As of December 31, 2013, the present value of the expected cash flows of the note receivable exceeded the outstanding balance of the note and therefore the note is considered recoverable as of December 31, 2013.

During 2012, the $23.5 million seven year purchase money mortgage note receivable (balance as of the payment date, including accrued but unpaid interest), which related to the 2009 sale of two Trenton properties, was paid in full prior to its scheduled maturity of October 2016. The Company also recognized a $12.9 million deferred gain and $1.0 million of interest income at the time of payment, in accordance with the accounting standard for installment sales.

Revenue Recognition

Rental revenue is recognized on the straight-line basis, which averages minimum rents over the terms of the leases from the later of the date of the commencement of the lease or the date of acquisition of the property subject to existing leases. The straight-line rent adjustment increased revenue by approximately $17.7 million in 2013, $21.1 million in 2012 and $17.9 million in 2011. Deferred rents on the balance sheet represent rental revenue received prior to their due dates and amounts paid by the tenant for certain improvements considered to be landlord assets that will remain as the Company’s property at the end of the tenant’s lease term. The amortization of the amounts paid by the tenant for such improvements is calculated on a straight-line basis over the term of the tenant’s lease and is a component of straight-line rental income and increased revenue by $2.4 million in each of 2013, 2012 and 2011. Lease incentives, which are included as reductions of rental revenue in the accompanying consolidated statements of operations, are recognized on a straight-line basis over the term of the lease. Lease incentives decreased revenue by $0.7 million in 2013, $0.8 million in 2012, and $1.6 million in 2011.

The Company's leases also typically provide for tenant reimbursement of a portion of common area maintenance expenses and other operating expenses to the extent that a tenant’s pro rata share of expenses exceeds a base year level set in the lease or to the extent that the tenant has a lease on a triple net basis. For certain leases, the Company makes significant assumptions and judgments in determining the lease term, including assumptions when the lease provides the tenant with an early termination option. The lease term impacts the period over which the Company determines and records minimum rents and also impacts the period over which the Company amortizes lease-related costs.

In addition, the Company's rental revenue is impacted by the Company's determination of whether improvements to the properties, whether made by the Company or by the tenant, are landlord assets. The determination of whether an improvement is a landlord asset requires judgment. In making this judgment, our primary consideration is whether the improvement would be utilizable by another tenant upon move out of the improved space by the then-existing tenant. If the Company has funded an improvement that it determines not to be landlord assets, then it treats the costs of the improvement as lease incentives. If the tenant has funded the improvement that the Company determines to be landlord assets, then the Company treats the costs of the improvement as deferred revenue and amortize this cost into revenue over the lease term.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance expenses, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred.

Tenant reimbursements are recognized and presented in accordance with accounting guidance which requires that these reimbursements be recorded on a gross basis because the Company is generally the primary obligor with respect to the goods and services the purchase of which gives rise to the reimbursement obligation; because the Company has discretion in selecting the vendors and suppliers; and because the Company bears the credit risk in the event they do not reimburse the Company. The Company also receives payments from third parties for reimbursement of a portion of the payroll and payroll-related costs for certain of the Company's personnel allocated to perform services for these third parties and reflects these payments on a gross basis.

The Company recognizes gains on sales of real estate at times and in amounts determined in accordance with the accounting guidance for sales of real estate. The guidance takes into account the terms of the transaction and any continuing involvement, including in the form of management, leasing of space or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, then the Company defers some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery method, as appropriate, until the sales criteria are met

The Company derives parking revenues from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company receives management and development fees from third parties.

Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company records development fees as earned taking into account the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

No tenant represented greater than 10% of the Company’s rental revenue in 2013, 2012 or 2011.

Income Taxes

Parent Company

The Parent Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). In order to continue to qualify as a REIT, the Parent Company is required to, among other things, distribute at least 90% of its annual REIT taxable income to its shareholders and meet certain tests regarding the nature of its income and assets. As a REIT, the Parent Company is not subject to federal and state income taxes with respect to the portion of its income that meets certain criteria and is distributed annually to its shareholders. Accordingly, no provision for federal and state income taxes is included in the accompanying consolidated financial statements with respect to the operations of the Parent Company. The Parent Company intends to continue to operate in a manner that allows it to meet the requirements for taxation as a REIT. If the Parent Company fails to qualify as a REIT in any taxable year, it will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent tax years. The Parent Company is subject to certain local income taxes. Provision for such taxes has been included in general and administrative expenses in the Parent Company’s Consolidated Statements of Operations and Comprehensive Income.

The tax basis of the Parent Company’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Parent Company is subject to a 4% federal excise tax if sufficient taxable income is not distributed within prescribed time limits. The excise tax equals 4% of the annual amount, if any, by which the sum of (a) 85% of the Parent Company’s ordinary income and (b) 95% of the Parent Company’s net capital gain exceeds cash distributions and certain taxes paid by the Parent Company. No excise tax was incurred in 2013, 2012, or 2011.

The Parent Company has elected to treat several of its subsidiaries as taxable REIT subsidiaries (each a “TRS”). A TRS is subject to federal, state and local income tax. In general, a TRS may perform non-customary services for tenants, hold assets that the Parent Company, as a REIT, cannot hold directly and generally may engage in any real estate or non-real estate related business. The Company’s taxable REIT subsidiaries did not have any tax provisions or deferred income tax items as of December 31, 2013 and 2012.

Operating Partnership

In general, the Operating Partnership is not subject to federal and state income taxes, and accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements. The partners of the Operating Partnership are required to include their respective share of the Operating Partnership’s profits or losses in their respective tax returns. The Operating Partnership’s tax returns and the amount of allocable Partnership profits and losses are subject to examination by federal and state taxing authorities. If such examination results in changes to the Operating Partnership profits or losses, then the tax liability of the partners would be changed accordingly.

The tax basis of the Operating Partnership’s assets was $4.0 billion for each of the years ended December 31, 2013 and 2012.

The Operating Partnership may elect to treat one or more of its subsidiaries as REITs under Sections 856 through 860 of the Code. Each subsidiary REIT has met the requirements for treatment as a REIT under Sections 856 through 860 of the Code, and, accordingly, no provision has been made for federal and state income taxes in the accompanying consolidated financial statements. If any subsidiary REIT fails to qualify as a REIT in any taxable year, that subsidiary REIT will be subject to federal and state income taxes and may not be able to qualify as a REIT for the four subsequent taxable years. Also, each subsidiary REIT may be subject to certain local income taxes.

The Operating Partnership has elected to treat several of its subsidiaries as TRSs, which are subject to federal, state and local income tax.

Earnings Per Share

Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings, if any, of certain securities, by the weighted average number of shares of common stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options, and conversion of the noncontrolling interests in the Operating Partnership.

Earnings Per Unit

Basic EPS is computed by dividing net income available to common unitholders, as adjusted for unallocated earnings, if any, of certain securities issued by the Operating Partnership, by the weighted average number of common unit equivalents outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under share-based compensation plans, including upon the exercise of stock options.

Stock-Based Compensation Plans

The Parent Company maintains a shareholder-approved equity-incentive plan known as the Amended and Restated 1997 Long-Term Incentive Plan (the “1997 Plan”). The 1997 Plan is administered by the Compensation Committee of the Parent Company’s Board of Trustees. Under the 1997 Plan, the Compensation Committee is authorized to award equity and equity-based awards, including incentive stock options, non-qualified stock options, restricted shares and performance-based shares. On June 2, 2010, the Parent Company’s shareholders approved amendments to the 1997 Plan that, among other things, increased the number of common shares available for future awards under the 1997 Plan by 6,000,000 (of which 3,600,000 shares are available solely for options and share appreciation rights). As of December 31, 2013, 5,195,177 common shares remained available for future awards under the 1997 Plan (including 2,983,569 shares available solely for options and share appreciation rights). Through December 31, 2013 all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $8.3 million during 2013, of which $1.4 million was capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company incurred stock-based compensation expense of $8.6 million and $6.4 million during 2012 and 2011, of which $2.6 million and $1.5 million, respectively, were also capitalized. The expensed amounts are included in general and administrative expense on the Company’s consolidated income statement in the respective periods.

Comprehensive Income

Comprehensive income or loss is recorded in accordance with the provisions of the accounting standard for comprehensive income. The accounting standard establishes standards for reporting comprehensive income and its components in the financial statements. Comprehensive income includes the effective portions of changes in the fair value of derivatives.

Accounting for Derivative Instruments and Hedging Activities

The Company accounts for its derivative instruments and hedging activities in accordance with the accounting standard for derivative and hedging activities. The accounting standard requires the Company to measure every derivative instrument (including certain derivative instruments embedded in other contracts) at fair value and record them in the balance sheet as either an asset or liability. See disclosures below related to the accounting standard for fair value measurements and disclosures.

For derivatives designated as cash flow hedges, the effective portions of changes in the fair value of the derivative are reported in other comprehensive income while the ineffective portions are recognized in earnings.

The Company actively manages its ratio of fixed-to-floating rate debt. To manage its fixed and floating rate debt in a cost-effective manner, the Company, from time to time, enters into interest rate swap agreements as cash flow hedges, under which it agrees to exchange various combinations of fixed and/or variable interest rates based on agreed upon notional amounts.

Fair Value Measurements

The Company estimates the fair value of its derivatives in accordance with the accounting standard for fair value measurements and disclosures. The accounting standard defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. It also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value. Financial assets and liabilities recorded on the Consolidated Balance Sheets are categorized based on the inputs to the valuation techniques as follows:

• Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access;

• Level 2 inputs are inputs other than quoted prices included in Level 1, that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals; and

• Level 3 inputs are unobservable inputs for the asset or liability, which is typically based on an entity’s own assumptions, as there is little, if any, related market activity or information.

In instances where 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 input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2013 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2013		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Interest Rate Swaps	$	767	$	—	$	767	$	—
Liabilities:
Interest Rate Swaps	$	2,188	$	—	$	2,188	$	—

The following table sets forth the Company’s financial liabilities that were accounted for at fair value on a recurring basis as of December 31, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	14,210	$	—	$	14,210	$	—

We classify our interest rate swaps, shown above, within Level 2 as the valuation inputs are based on quoted prices and market observable data of similar instruments.

Non-financial assets and liabilities recorded at fair value on a non-recurring basis to which the Company would apply the accounting standard where a measurement was required under fair value would include:

• Non-financial assets and liabilities initially measured at fair value in an acquisition or business combination that are not remeasured at least quarterly at fair value,

• Long-lived assets measured at fair value due to an impairment in accordance with the accounting standard for the impairment or disposal of long-lived assets,

• Equity and cost method investments measured at fair value due to an impairment in accordance with the accounting standard for investments,

• Notes receivable adjusted for any impairment in its value in accordance with the accounting standard for loan receivables, and

• Asset retirement obligations initially measured at fair value under the accounting standard for asset retirement obligations.

Other than the remeasurements of our equity method investments of Six Tower Bridge, One Commerce Square and Two Commerce Square (see Note 3), the formation of the Austin Venture (see Note 4) and the 2013 business combinations (see Note 3), there were no items that were accounted for at fair value on a non-recurring basis for the twelve months ended December 31, 2013.

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Organization of The Parent Company and The Operating Partnership

12 Months Ended

Dec. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP

The Parent Company is a self-administered and self-managed real estate investment trust (“REIT”) that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office and industrial properties. The Parent Company owns its assets and conducts its operations through the Operating Partnership and subsidiaries of the Operating Partnership. The Parent Company is the sole general partner of the Operating Partnership and, as of December 31, 2013, owned a 98.8% interest in the Operating Partnership. The Parent Company’s common shares of beneficial interest are publicly traded on the New York Stock Exchange under the ticker symbol “BDN”.

As of December 31, 2013, the Company owned 204 properties, consisting of 176 office properties, 19 industrial facilities, five mixed-use properties, one development property, two redevelopment properties and one re-entitlement property (collectively, the “Properties”) containing an aggregate of approximately 24.8 million net rentable square feet. In addition, as of December 31, 2013, the Company owned economic interests in 17 unconsolidated real estate ventures that contain approximately 5.7 million net rentable square feet (collectively, the “Real Estate Ventures”). As of December 31, 2013, the Company also owned 432 acres of undeveloped land, and held options to purchase approximately 51 additional acres of undeveloped land. As of December 31, 2013, the total potential development that these land parcels could support, under current zoning, entitlements or combination thereof, amounted to 6.8 million square feet. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord and Carlsbad, California. In addition to managing properties that the Company owns, as of December 31, 2013, the Company was managing approximately 7.9 million net rentable square feet of office and industrial properties for third parties and the Real Estate Ventures.

All references to building square footage, acres, occupancy percentage and the number of buildings are unaudited.

The Company conducts its third-party real estate management services business primarily through six management companies (collectively, the “Management Companies”): Brandywine Realty Services Corporation (“BRSCO”), BTRS, Inc. (“BTRS”), Brandywine Properties I Limited, Inc. (“BPI”), BDN Brokerage, LLC (“BBL”), Brandywine Properties Management, L.P. (“BPM”) and Brandywine Brokerage Services, LLC (“BBS”). Each of BRSCO, BTRS and BPI is a taxable REIT subsidiary. As of December 31, 2013, the Operating Partnership owns, directly and indirectly, 100% of each of BRSCO, BTRS, BPI, BBL, BPM and BBS. As of December 31, 2013, the Management Companies were managing properties containing an aggregate of approximately 32.7 million net rentable square feet, of which approximately 24.8 million net rentable square feet related to Properties owned by the Company and approximately 7.9 million net rentable square feet related to properties owned by third parties and Real Estate Ventures.

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Partners Equity of The Operating Partnership

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

PARTNERS' EQUITY OF THE OPERATING PARTNERSHIP

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Year ended December 31,
	2013						2012						2011
	Basic			Diluted			Basic			Diluted			Basic			Diluted
Numerator
Income (loss) from continuing operations	$	38,982		$	38,982		$	(37,309	)	$	(37,309	)	$	(24,556	)	$	(24,556	)
Amount allocable to unvested restricted unitholders	(363		)	(363		)	(376		)	(376		)	(505		)	(505		)
Preferred unit dividends	(6,900		)	(6,900		)	(10,405		)	(10,405		)	(7,992		)	(7,992		)
Preferred unit redemption charge	—			—			(4,052		)	(4,052		)	—			—
Income (loss) from continuing operations available to common unitholders	31,719			31,719			(52,142		)	(52,142		)	(33,053		)	(33,053		)
Discontinued operations attributable to common unitholders	4,207			4,207			43,838			43,838			19,841			19,841
Net income (loss) attributable to common unitholders	$	35,926		$	35,926		$	(8,304	)	$	(8,304	)	$	(13,212	)	$	(13,212	)
Denominator
Weighted-average units outstanding	154,929,545			154,929,545			145,883,217			145,883,217			145,118,841			145,118,841
Contingent securities/Share based compensation	—			1,273,853			—			—			—			—
Total weighted-average units outstanding	154,929,545			156,203,398			145,883,217			145,883,217			145,118,841			145,118,841
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	0.20		$	0.20		$	(0.36	)	$	(0.36	)	$	(0.23	)	$	(0.23	)
Discontinued operations attributable to common unitholders	0.03			0.03			0.30			0.30			0.14			0.14
Net income (loss) attributable to common unitholders	$	0.23		$	0.23		$	(0.06	)	$	(0.06	)	$	(0.09	)	$	(0.09	)

Unvested restricted units are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the years ended December 31, 2013, 2012 and 2011, earnings representing nonforfeitable dividends were allocated to the unvested restricted units.

Common Partnership Units and Preferred Mirror Units

The Operating Partnership issues partnership units to the Parent Company in exchange for the contribution of the net proceeds of any equity security issuance by the Parent Company. The number and terms of such partnership units correspond to the number and terms of the related equity securities issued by the Parent Company. In addition, the Operating Partnership may also issue separate classes of partnership units. Historically, the Operating Partnership has had the following types of partnership units outstanding (i) Preferred Partnership Units which have been issued to parties other than the Parent Company (ii) Preferred Mirror Partnership Units which have been issued to the Parent Company and (iii) Common Partnership Units which include both interests held by the Parent Company and those held by other limited partners. Each of these interests is described in more detail below.

Preferred Mirror Partnership Units

In exchange for the proceeds received in corresponding offerings by the Parent Company of preferred shares of beneficial interest, the Operating Partnership has issued to the Parent Company a corresponding amount of Preferred Mirror Partnership Units with terms consistent with that of the preferred securities issued by the Parent Company.

Common Partnership Units (Redeemable and General)

The Operating Partnership has two classes of Common Partnership Units: (i) Class A Limited Partnership Interest which are held by both the Parent Company and outside third parties and (ii) General Partnership Interests which are held by the Parent Company (collectively, the Class A Limited Partnership Interest, and General Partnership Interests are referred to as “Common Partnership Units”). The holders of the Common Partnership Units are entitled to share in cash distributions from, and in profits and losses of, the Operating Partnership, in proportion to their respective percentage interests, subject to preferential distributions on the preferred mirror units and the preferred units.

The Common Partnership Units held by the Parent Company (comprised of both General Partnership Units and Class A Limited Partnership Units) are presented as partner’s equity in the consolidated financial statements. Class A Limited Partnership Interest held by parties other than the Parent Company are redeemable at the option of the holder for a like number of common shares of the Parent Company, or cash, or a combination thereof, at the election of the Parent Company. Because the form of settlement of these redemption rights are not within the control of the Operating Partnership, these Common Partnership Units have been excluded from partner’s equity and are presented as redeemable limited partnership units measured at the potential cash redemption value as of the end of the periods presented based on the closing market price of the Parent Company’s common shares at December 31, 2013, 2012 and 2011, which was $14.09, $12.19, $9.50, respectively. As of December 31, 2013 and 2012, 1,763,739 and 1,845,737 of Class A Units, respectively, were outstanding and owned by outside limited partners of the Operating Partnership.

On December 10, 2013, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $23.9 million, which was paid on January 21, 2014 to unitholders of record as of January 6, 2014.

On December 10, 2013, the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of December 30, 2013. These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on January 15, 2014 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million.

On November 5, 2013, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell, in at-the-market offerings, up to an aggregate amount of 16,000,000 common shares until November 5, 2013. This Offering Program replaced a prior continuous equity offering program which expired on March 10, 2013. The Parent Company may sell common shares in amounts and at times to be determined by the Parent Company. Actual sales will depend on a variety of factors to be determined by the Parent Company, including, among others, market conditions, the trading price of the Company’s common shares of beneficial interest and determinations by the Parent Company of the appropriate sources of funding. In conjunction with the Offering Program, the Parent Company engages sales agents who receive compensation, in aggregate, of up to 2% of the gross sales price per share sold. From inception of the Offering Program through December 31, 2013, the Parent Company has not sold any shares under the program, resulting in 16,000,000 remaining shares available for sale. Generally, the Parent Company contributes the net proceeds from the sales to the Operating Partnership, which the Operating Partnership in turn uses for general corporate purposes.

Common Unit Repurchases

The Parent Company did not repurchase any shares under its share repurchase program during the year-ended December 31, 2013 and accordingly, during the year-ended December 31, 2013, the Operating Partnership did not repurchase any units in connection with the Parent Company’s share repurchase program.

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Risk Management and Use of Financial Instruments

12 Months Ended

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS

RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS

Risk Management

In the course of its ongoing business operations, the Company encounters economic risk. There are three main components of economic risk: interest rate risk, credit risk and market risk. The Company is subject to interest rate risk on its interest-bearing liabilities. Credit risk is primarily the risk of inability or unwillingness of tenants to make contractually required payments and of counterparties on derivatives contracts to fulfill their obligations. Market risk is the risk of declines in the value of Company properties due to changes in rental rates, interest rates, supply and demand of similar products and other market factors affecting the valuation of properties.

Risks and Uncertainties

The ongoing recovery in the global economy has been much slower than anticipated and continue to have an influence on the volume of real estate transactions in the market and created credit stresses on many businesses. If the economy again deteriorates, vacancy rates may increase through 2014 and possibly beyond as the current economic climate continues to negatively impact tenants. The current financial markets also have an adverse effect on the Company’s Real Estate Venture partners and contractual counter parties, including counter parties in derivative contracts.

The Company’s Credit Facility, term loans and the indenture governing its unsecured public debt securities (Note 7) contain restrictions, requirements and other limitations on the ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt which it must maintain. The ability to borrow under the Credit Facility is subject to compliance with such financial and other covenants. In the event that the Company fails to satisfy these covenants, it would be in default under the Credit Facility, the term loans and the indenture and may be required to repay such debt with capital from other sources. Under such circumstances, other sources of capital may not be available, or may be available only on unattractive terms.

Availability of borrowings under the Credit Facility is subject to a traditional material adverse effect clause. Each time the Company borrows it must represent to the lenders that there have been no events of a nature which would have a material adverse effect on the business, assets, operations, condition (financial or otherwise) or prospects of the Company taken as a whole or which could negatively affect the ability of the Company to perform its obligations under the Credit Facility. While the Company believes that there are currently no material adverse effect events, it is possible that such an event could arise which would limit the Company’s borrowings under the Credit Facility. If an event occurs which is considered to have a material adverse effect, the lenders could consider the Company in default under the terms of the Credit Facility and any borrowings under the Credit Facility would become unavailable. If the Company is unable to obtain a waiver, this would have a material adverse effect on the Company’s financial position and results of operations.

The Company was in compliance with all financial covenants as of December 31, 2013. Management continuously monitors the Company’s compliance with and anticipated compliance with the covenants. Certain of the covenants restrict management’s ability to obtain alternative sources of capital. While the Company currently believes it will remain in compliance with its covenants, in the event that the economy deteriorates in the future, the Company may not be able to remain in compliance with such covenants, in which case a default would result absent a lender waiver.

Use of Derivative Financial Instruments

The Company’s use of derivative instruments is limited to the utilization of interest rate agreements or other instruments to manage interest rate risk exposures and not for speculative purposes. The principal objective of such arrangements is to minimize the risks and/or costs associated with the Company’s operating and financial structure, as well as to hedge specific transactions. The counterparties to these arrangements are major financial institutions with which the Company and its affiliates may also have other financial relationships. The Company is potentially exposed to credit loss in the event of non-performance by these counterparties. However, because of the high credit ratings of the counterparties, the Company does not anticipate that any of the counterparties will fail to meet these obligations as they come due. The Company does not hedge credit or property value market risks through derivative financial instruments.

The Company formally assesses, both at inception of a hedge and on an on-going basis, whether each derivative is highly-effective in offsetting changes in cash flows of the hedged item. If management determines that a derivative is not highly-effective as a hedge or if a derivative ceases to be a highly-effective hedge, the Company will discontinue hedge accounting prospectively. The related ineffectiveness would be charged to the consolidated statement of operations.

The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.

To comply with the provisions of the accounting standard for fair value measurements and disclosures, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

The following table summarizes the terms and fair values of the Company's derivative financial instruments as of December 31, 2013 and 2012. The notional amounts provide an indication of the extent of the Company's involvement in these instruments at that time, but do not represent exposure to credit, interest rate or market risks (amounts presented in thousands and included in other liabilities on the Company's consolidated balance sheets).

Hedge Product	Hedge Type	Designation		Notional Amount				Strike		Trade Date	Maturity Date	Fair value
				12/31/2013		12/31/2012						12/31/2013			12/31/2012
Assets
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	549			(1,262		)
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.090	%	January 6, 2012	October 30, 2019	218			(1,129		)
				$	51,548	$	51,548					$	767		$	(2,391	)
Liabilities
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	(545	)	$	(8,859	)
Swap	Interest Rate	Cash Flow	(a)	77,000		77,000		2.703	%	December 9-13, 2011	February 1, 2016	(887		)	(1,343		)
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	(283		)	(458		)
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2011	May 1, 2015	(162		)	(245		)
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	(311		)	(914		)
				$	377,062	$	377,062					$	(2,188	)	$	(11,819	)

(a) Hedging unsecured variable rate debt.

The Company measures its derivative instruments at fair value and records them in the balance sheet as either an asset or liability. As of December 31, 2013, two interest rate swaps held asset positions and were included in other assets on the Company's consolidated balance sheet. The remaining swaps are included in other liabilities on the Company's consolidated balance sheet.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Concentration of Credit Risk

Concentrations of credit risk arise for the Company when multiple tenants of the Company are engaged in similar business activities, or are located in the same geographic region, or have similar economic features that impact in a similar manner their ability to meet contractual obligations, including those to the Company. The Company regularly monitors its tenant base to assess potential concentrations of credit risk. Management believes the current credit risk portfolio is reasonably well diversified and does not contain an unusual concentration of credit risk. No tenant accounted for 10% or more of the Company’s rents during 2013, 2012 and 2011. Conditions in the general economy and the global credit markets have had a significant adverse effect on numerous industries. The Company has tenants concentrated in various industries that may be experiencing adverse effects from the current economic conditions and the Company could be adversely affected if such tenants were to default under their leases.

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Non Controlling Interests in The Parent Company Non Contolling Interests in the Parent Company (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 20.3	$ 21.2
Settlement value of non controlling interest in operating partnership	$ 24.8	$ 22.5

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Deferred Costs

12 Months Ended

Dec. 31, 2013

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred Costs [Text Block]

5. DEFERRED COSTS

As of December 31, 2013 and 2012, the Company’s deferred costs were comprised of the following (in thousands):

	December 31, 2013
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	155,885	$	(58,805	)	$	97,080
Financing Costs	40,317		(14,443		)	25,874
Total	$	196,202	$	(73,248	)	$	122,954

	December 31, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	150,331	$	(58,343	)	$	91,988
Financing Costs	40,246		(9,991		)	30,255
Total	$	190,577	$	(68,334	)	$	122,243

During the years ended December 31, 2013, 2012 and 2011, the Company capitalized internal direct leasing costs of $7.5 million, $7.5 million, and $6.6 million, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Principles of Consolidation/Depreciation and Amortization) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2006
Depreciation and amortization expense relating to intangibles	$ 4.7	$ 1.7	$ 1.4	$ 1.8	$ 1.7	$ 1.5

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Real Estate Investments

12 Months Ended

Dec. 31, 2013

Real Estate [Abstract]

REAL ESTATE INVESTMENTS

REAL ESTATE INVESTMENTS

As of December 31, 2013 and 2012 the gross carrying value of the Company’s Properties was as follows (in thousands):

	2013		2012
Land	$	680,513	$	662,107
Building and improvements	3,504,060		3,576,065
Tenant improvements	484,716		487,997
	$	4,669,289	$	4,726,169

Acquisitions and Dispositions

2013

Acquisitions

One and Two Commerce Square

On December 19, 2013, the Company acquired 99% of the common interests in the One and Two Common Square partnerships ("Commerce Square"), the entities which own two 41-story Trophy-class office towers in Philadelphia, Pennsylvania, from Parkway Properties, Inc. The office towers contain 1,896,142 of net rentable square feet and were 86.7% occupied as of December 31, 2013.  The Company acquired Commerce Square for an aggregate purchase price of $331.8 million and funded the acquisition via assumption of $237.1 million of existing mortgage debt and a $73.1 million cash payment from available corporate funds.

The Company previously accounted for our non-controlling interest in Commerce Square under the equity method of accounting. As a result of acquiring a 99% common interest in the partnerships we obtained control of Commerce Square and our existing investment balance was remeasured based on the fair value of the underlying properties acquired and the existing distribution provisions under the relevant partnership agreements. Accordingly, a loss on remeasurement of $1.0 million was recorded as a result of this transaction.

The Company has treated this transaction as a business combination and allocated the purchase price to the tangible and intangible assets and liabilities. As discussed in Note 2, the Company utilized a number of sources in making estimates of fair values for purposes of allocating the purchase price to tangible and intangibles assets acquired and intangible liabilities assumed. The purchase price is allocated as follows:

	December 19, 2013
Building, land and improvements	$	255,705
Intangible assets acquired	85,036
Below market lease liabilities assumed	(8,637		)
	$	332,104
Mortgage debt assumed - at fair value (1)	(238,082		)
Return of existing equity method investment	(30,424		)
Net working capital assumed	10,423
Non-controlling interest	(946		)
Total cash payment at settlement	$	73,075

(1) Principal outstanding on assumed mortgage debt at December 19, 2013 was $237.1 million.

Intangible assets acquired and intangible liabilities assumed consist of the following (in thousands):

	December 19, 2013			Weighted Average Amortization Period (in years)
Intangible assets:
In-place lease value	$	80,916		7.9
Above market tenant leases acquired	4,120			6.9
Total	$	85,036
Intangible liabilities:
Below market leases acquired	$	(8,637	)	6.5

The Commerce Square redemption agreement allows for a 60 day settlement period related to the net working capital assets related to the acquired partnership interests. As of December 31, 2013, the Company has a $2.1 million receivable balance from its former partner which is due under the terms of the redemption agreement.

In connection with the acquisition of One Commerce Square, we assumed a $125.1 million existing non-recourse first mortgage with a fixed interest rate of 5.67% and a maturity date of January 6, 2016. In accordance with generally accepted accounting principles, the mortgage was recorded at $130.2 million to reflect the fair value.

In connection with the acquisition of Two Commerce Square, we assumed a $112.0 million existing non-recourse first mortgage with a fixed interest rate of 3.96% and a maturity date of April 5, 2023. In accordance with generally accepted accounting principles, the mortgage was recorded at $107.9 million to reflect the fair value.

The Company recognized $0.9 million of acquisition related costs which are included as part of general and administrative expenses of the Company’s consolidated statement of operations.

Four Points Centre

On December 19, 2013, the Company acquired two 3-story, Class A office buildings totaling 192,396 of net rentable square feet known as Four Points Centre, together with 22.3 acres of nearby parcels of land in Austin, Texas known for an aggregate $47.3 million. This property was 99.2% occupied as of December 31, 2013. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition has been treated as a business combination and the total purchase price was allocated as follows: $36.0 million to building, $5.8 million to land, $6.5 million to intangible assets and $1.0 million to below market lease liabilities assumed.

Six Tower Bridge

On June 19, 2013, the Company acquired the remaining ownership interest in the real estate venture known as "Six Tower Bridge" that it did not then already own. See Note 4 "Investments in Unconsolidated Real Estate Ventures" for further discussion.

The unaudited pro forma information below summarizes the Company’s combined results of operations for the years ended December 31, 2013 and 2012 as though the acquisition of One and Two Commerce Square, Four Points Centre and Six Tower Bridge were completed on January 1, 2012. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor do they purport to represent the Company’s results of operations for future periods (in thousands except for per share amounts).

	December 31,
	2013		2012
Pro forma revenue	$	610,979	$	592,753
Pro forma income (loss) from continuing operations	21,805		(60,011		)
Pro forma net income (loss) available to common shareholders	25,957		(16,970		)
Earnings per common share from continuing operations:
Basic -- as reported	$	0.20	$	(0.36	)
Basic -- as pro forma	$	0.14	$	(0.42	)
Diluted -- as reported	$	0.20	$	(0.36	)
Diluted -- as pro forma	$	0.14	$	(0.42	)
Earnings per common share:
Basic -- as reported	$	0.23	$	(0.06	)
Basic -- as pro forma	$	0.17	$	(0.12	)
Diluted -- as reported	$	0.23	$	(0.06	)
Diluted -- as pro forma	$	0.17	$	(0.12	)

Included in the consolidated statements of income for the year ended December 31, 2013 are total revenues of $3.4 million and a net loss attributable to common shareholders of $0.2 million from acquisitions made during 2013.

Cira Centre

On November 19, 2013, the Company acquired a 0.8 acre land parcel underlying Cira Centre in Philadelphia, Pennsylvania for $24.6 million. The purchase terminates a long term ground lease agreement entered into during the development of Cira Centre. The Company has accounted for the transaction as an asset acquisition. Prior to the acquisition date, the Company recorded ground rent expense on a straight-line basis, resulting in accrued rent liability of $12.1 million. The accounting guidance for leases requires that an asset purchased which was previously subject to an operating lease cannot result in a gain, accordingly, the basis of the acquired land was reduced by the accrued rent liability and no income was recognized at acquisition. The Company funded the cost of the acquisition with available corporate funds and capitalized $1.4 million of acquisition related costs as part of the basis in the operating land.

Three Logan Square

On April 25, 2013, the Company exercised its purchase option under the long term ground lease agreement it held through its acquisition of Three Logan Square on August 5, 2010 and acquired the 1.8 acre land parcel underlying Three Logan Square in Philadelphia, Pennsylvania for $20.8 million. The Company has accounted for the transaction as an asset acquisition. A portion of the original purchase price of Three Logan Square was allocated to a below market ground lease intangible asset. As the sum of the purchase price of the land plus the $4.3 million remaining unamortized balance for the intangible asset approximates the fair value of the land as unencumbered by the ground lease, the remaining intangible asset balance was reclassified to land upon exercise of the purchase option. The Company funded the cost of the acquisition with available corporate funds and capitalized $0.1 million of acquisition related costs as part of the basis in the operating land.

Dispositions

On December 19, 2013, we sold a 50,000 net rentable square feet office property located in King of Prussia, Pennsylvania known as 875 First Avenue, for a sales price of $3.8 million resulting in a $0.1 million gain on sale after closing and other transaction related costs.

On October 17, 2013, we sold a 39,330 net rentable square feet office property located in West Chester, Pennsylvania known as 1336 Enterprise Drive, for a sales price of $2.6 million resulting in a $0.2 million gain on sale after closing and other transaction related costs.

On October 16, 2013 the Austin portfolio was contributed to a newly formed real estate venture. For additional information, see Note 4 to our consolidated financial statements.

On August 5, 2013, the Company sold an eight-acre parcel of land located in Richmond, Virginia known as Dabney Land East, for a sales price of $0.5 million resulting in a $0.1 million loss on sale after closing and other transaction related costs. The land parcel was undeveloped as of the date of sale.

On June 28, 2013, the Company sold 16870 West Bernardo Drive, a 68,708 net rentable square feet office property located in San Diego, California, for a sales price of $18.0 million resulting in a $0.9 million loss on sale after closing and other transaction related costs.

On June 28, 2013, the Company sold 100 Arrandale Boulevard, a 34,931 net rentable square feet office property located in Exton, Pennsylvania, for a sales price of $3.5 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 19, 2013, the Company sold 1700 Paoli Pike, a 28,000 net rentable square feet office property located in Malvern, Pennsylvania known as 100 Applebrook, for a sales price of $2.7 million resulting in a $0.4 million loss on sale after closing and other transaction related costs.

On June 14, 2013, the Company sold Pacific View Plaza, a 51,695 net rentable square feet office property located in Carlsbad, California, for a sales price of $10.3 million resulting in a $0.5 million loss on sale after closing and other transaction related costs.

On February 25, 2013, the Company sold a portfolio of eight office properties containing 800,546 square feet in Lawrenceville, New Jersey, known as "Princeton Pike Corporate Center," for an aggregate sales price of $121.0 million resulting in a $5.3 million gain on sale after closing and other transaction related costs.

The sales of these properties, with the exception of the Austin portfolio and Dabney Land East, are included in discontinued operations (see Note 10).

2012

Brandywine/Toll Brothers Venture Formation

On September 5, 2012, the Company formed a joint venture, TB-BDN Plymouth Apartments, L.P., (the "Venture"), with Toll Brothers, Inc. ("Toll Brothers"), a residential home builder. The Company and Toll Brothers each own a 50% interest in the Venture. The Venture owns a 20-acre parcel of land located in Plymouth Meeting, Pennsylvania, which the Company contributed to the Venture upon its formation. Concurrent with the Company's contribution of the aforementioned land parcel, Toll Brothers contributed $15.5 million of cash to the venture, equivalent to the fair value of the land parcel contributed by the Company. The Venture will use the cash contributed by Toll Brothers to fund predevelopment costs for construction of a 398 unit apartment complex.

Based on the facts and circumstances at the date of formation of the Venture, and in accordance with applicable accounting standards for the consolidation of variable interest entities, or VIEs, the Company determined that the Venture is not a VIE. Accordingly, the Company used the voting interest model under the accounting standards for consolidation to determine whether to consolidate the Venture. Under the joint venture agreement for the Venture, each of the Company and Toll Brothers has significant participating rights and the Company does not have exclusive control over the development or construction phases of the Venture's project. Because each partner has significant participating rights, the Company deconsolidated the land parcel that was contributed to the Venture, and the Company is accounting for the Venture under the equity method of accounting. As of December 31, 2012, the carrying amount of the Company's equity investment in the Venture equaled $15.2 million, with an associated $0.3 million permanent basis adjustment accounting for the difference between the fair value and carrying amount of the land parcel contributed by the Company. This basis adjustment will remain unamortized until the property is sold to a third party or until the Venture is dissolved, in accordance with the accounting standard for equity method investment.

Brandywine AI Venture - Station Square Acquisition

On July 10, 2012, the Company contributed $26.1 million to a joint venture, Brandywine AI Venture, that the Company formed in 2011 with an affiliate of Allstate Insurance. The Company's contribution funded its share of partner capital for the Venture's $120.6 million acquisition of three office properties containing 497,896 net rentable square feet in Silver Spring, Maryland.

Acquisitions

On December 31, 2012, the Company acquired a two-building office property totaling 136,075 of net rentable square feet in Austin, Texas known as 7000 West at Lantana for $32.1 million. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition was treated as a business combination and the total purchase price was allocated as follows: $20.9 million to building, $4.7 million to land, $8.4 million to intangible assets and $1.9 million to below market lease liabilities assumed.

On December 11, 2012, the Company acquired an office property containing 456,922 net rentable square feet in Philadelphia, Pennsylvania known as 1900 Market Street for $34.8 million. The Company funded the acquisition price with available corporate funds, while recognizing $0.1 million of acquisition related costs, which are included as part of general and administrative expenses in the Company's consolidated statements of operations. The acquisition was treated as a business combination and the total purchase price was allocated as follows: $17.3 million to building, $7.8 million to land, $13.5 million to intangible assets and $3.8 million to below market lease liabilities assumed.

On November 20, 2012, the Company acquired a ten-acre parcel of land in Herndon, Virginia for $2.1 million. The Company funded the acquisition price with available corporate funds. The Company accounted for this transaction as an asset acquisition and capitalized a nominal amount of acquisition related and other costs as part of land inventory on its consolidated balance sheet.

On January 6, 2012, the Company acquired a vacant office property containing 154,392 net rentable square feet in Plymouth Meeting, Pennsylvania known as 660 West Germantown Pike for $9.1 million. The Company is currently redeveloping this property. The Company funded the acquisition price with available corporate funds. The Company recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet.

Dispositions

On July 18, 2012, the Company sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, collectively known as "Oaklands Corporate Center," for a sales price of $52.7 million resulting in a $9.9 million gain on sale after closing and other transaction related costs.

On June 22, 2012, the Company sold Pacific Ridge Corporate Center, a 121,381 net rentable square feet, two-building office property located in Carlsbad, California, for a sales price of $29.0 million resulting in a $2.8 million loss on sale after closing and other transaction related costs.

On March 22, 2012, the Company sold South Lake at Dulles Corner, a 268,240 net rentable square feet office property located in Herndon, Virginia, for a sales price of $91.1 million resulting in a $14.5 million gain on sale after closing and other transaction related costs.

On January 17, 2012, the Company sold 304 Harper Drive, a 32,978 net rentable square feet office property located in Moorestown, New Jersey, for a sales price of $3.0 million resulting in a $0.2 million gain on sale after closing and other transaction related costs.

Each of these sales is included in discontinued operations (see Note 10).

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Investment in Unconsolidated Ventures

12 Months Ended

Dec. 31, 2013

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED VENTURES

INVESTMENT IN UNCONSOLIDATED VENTURES

As of December 31, 2013, the Company had an aggregate investment of approximately $180.5 million in 17 unconsolidated Real Estate Ventures. The Company formed or acquired interests in these ventures with unaffiliated third parties to develop or manage office properties or to acquire land in anticipation of possible development of office or residential properties. As of December 31, 2013, 11 of the real estate ventures owned 55 office buildings that contain an aggregate of approximately 5.7 million net rentable square feet; two real estate ventures owned 3.8 acres of undeveloped parcels of land; three real estate ventures owned 22.5 acres of land under active development and one real estate venture developed a hotel property that contains 137 rooms in Conshohocken, PA.

The Company accounts for its unconsolidated interests in its Real Estate Ventures using the equity method. The Company’s unconsolidated interests range from 20% to 65%, subject to specified priority allocations of distributable cash in certain of the Real Estate Ventures.

The amounts reflected in the following tables (except for the Company’s share of equity and income) are based on the historical financial information of the individual Real Estate Ventures. The Company does not record operating losses of the Real Estate Ventures in excess of its investment balance unless the Company is liable for the obligations of the Real Estate Venture or is otherwise committed to provide financial support to the Real Estate Venture.

The Company’s investment in Real Estate Ventures as of December 31, 2013 and the Company’s share of the Real Estate Ventures’ income (loss) for the year ended December 31, 2013 was as follows (in thousands):

	Ownership Percentage (a)		Carrying Amount			Company’s Share of 2013 Real Estate Venture Income (Loss)			Real Estate Venture Debt at 100%		Current Interest Rate		Debt Maturity
Broadmoor Austin Associates (f)	50	%	$	65,867		$	(52	)	$	56,616	7.04	%	Apr-23
Brandywine-AI Venture LLC	50	%	46,406			130			134,500		3.92	%	(b)
DRA (G&I) Austin (f)	50	%	17,262			(434		)	230,600		3.39	%	(c)
HSRE-Campus Crest IX, LLC (f)	30	%	13,761			—			966		L+2.20%		Jul-16
4040 Wilson LLC	50	%	13,499			—			—		N/A		N/A
TB-BDN Plymouth Apartments	50	%	12,402			5			—		L+1.70%		Dec-17
Brandywine 1919 Ventures	50	%	6,214			—			—		N/A		N/A
1000 Chesterbrook Blvd.	50	%	2,064			461			24,861		4.75	%	Dec-21
Four Tower Bridge	65	%	1,617			320			10,535		5.20	%	Feb-21
PJP VII	25	%	783			239			6,250		L+2.65%		Dec-19
Residence Inn Tower Bridge	50	%	742			326			13,700		5.63	%	Feb-16
Seven Tower Bridge	20	%	447			—			11,035		4.22	%	(d)
PJP II	30	%	330			(87		)	3,765		6.12	%	Nov-23
PJP V	25	%	175			158			5,437		6.47	%	Aug-19
PJP VI	25	%	112			70			8,404		6.08	%	Apr-23
BDN Beacon Venture LLC (i)	20	%	—			907			—		N/A		N/A
Six Tower Bridge (g)	63	%	—			165			—		N/A		N/A
One Commerce Square (h)	25	%	—			933			—		N/A		N/A
Two Commerce Square (h)	25	%	—			614			—		N/A		N/A
G&I Interchange Office LLC (DRA — N. PA) (e) (f)	20	%	—			(619		)	177,207		5.78	%	Jan-15
Two Tower Bridge (i)	35	%	—			265			—		N/A		N/A
Coppell Associates	50	%	(1,169		)	(78		)	15,984		5.75	%	Feb-16
Eight Tower Bridge (i)			—			3			—
Invesco, L.P. (i)			—			338			—
			$	180,512		$	3,664		$	699,860

(a) Ownership percentage represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

(b) The debt for these properties is comprised of three fixed rate mortgages: (1) $40.0 million with a 4.40% fixed interest rate due January 1, 2019, (2) $28.0 million with a 4.65% fixed interest rate due January 1, 2022, and (3) $66.5 million with a 3.22% fixed interest rate due August 1, 2019, resulting in a time and dollar weighted average rate of 3.92%.

(c) The debt for these properties is comprised of three mortgages: (1) $34.0 million with a 3.52% interest rate due November 1, 2018, (2) $56.0 million with a 3.19% interest rate due October 15, 2018, and (3) $140.6 million with a rate of 3.44% fixed interest rate due November 1, 2018, resulting in a time and dollar weighted average rate of 3.39%.

(d) Comprised of two fixed rate mortgages totaling $8.0 million that mature on February 8, 2015 and accrue interest at a current rate of 6% (increasing by 1% annually through maturity), a $1.0 million3% fixed rate loan with interest only through its September 1, 2025 maturity, and a $2.0 million4% fixed rate loan with interest only through its February 7, 2016 maturity, resulting in a time and dollar weighted average rate of 4.22%.

(e) Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. No investment in the real estate venture was reflected on the balance sheet at formation.

(f) The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).

(g) On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.

(h) On December 19, 2013, we increased our ownership interest in One and Two Commerce Square. The real estate venture income reflects our previous partnership interest for the year to date period through December 18, 2013.

(i) The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.

The following is a summary of the financial position of the Real Estate Ventures as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013		December 31, 2012
Net property	$	965,475	$	923,536
Other assets	164,152		174,677
Other liabilities	49,442		53,645
Debt	699,860		724,780
Equity	380,325		319,788
Company’s share of equity (Company’s basis)	180,512		193,555

The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests as of December 31, 2013, 2012 and 2011 (in thousands):

	Years ended December 31,
	2013		2012		2011
Revenue	$	102,919	$	164,013	$	145,867
Operating expenses	40,436		70,775		63,715
Interest expense, net	26,529		41,633		42,032
Depreciation and amortization	35,138		50,241		39,172
Net income	816		1,364		948
Company’s share of income (Company’s basis)	3,664		2,741		3,775

As of December 31, 2013, the aggregate principal payments of recourse and non-recourse debt payable to third-parties are as follows (in thousands):

2014	$	11,940
2015	191,304
2016	42,180
2017	13,937
2018	229,780
Thereafter	210,719
	$	699,860

Austin Venture

On October 16, 2013, the Company contributed a portfolio of seven office properties containing an aggregate of 1,398,826 square feet located in Austin, Texas (the "Austin Properties") to a newly-formed joint venture (the "Austin Venture") with G&I VII Austin Office LLC (“DRA”). The Austin Properties and related assets represent the Company's entire remaining property portfolio within the Austin, Texas region, with the exception of the acquisition of Four Points Centre disclosed in Note 3. DRA and the Company, based on arm's-length negotiation, agreed to an aggregate gross sales price of $330.0 million subject to an obligation on the Company's part to fund the first $5.2 million of post-closing capital expenditures, of which $0.8 million had been funded by us through December 31, 2013.

DRA owns a 50% interest in the Austin Venture and the Company owns a 50% interest in the Austin Venture, subject to the Company's right to receive up to an additional 10% of distributions.

At the closing the Austin Venture obtained third party debt financing of approximately $230.6 million secured by mortgages on the Austin Properties and used proceeds of this financing together with $49.7 million of cash contributions by DRA (less $1.9 million of closing costs and $6.9 million of closing prorations and lender holdbacks) to fund a $271.5 million distribution to the Company. The Company has agreed to fund the first $5.2 million of post-closing capital expenditures on behalf of the Austin Venture, resulting in net proceeds of $266.3 million after funding the Company's capital expenditure obligation. As part of the transaction, the Company's subsidiary management company executed an agreement with the Austin Venture to provide property management and leasing services to the Austin Venture in exchange for a market-based fee.

The Company and DRA, utilizing additional equity funding of up to $100.0 million per partner and to-be-determined third-party debt financing, intend to jointly pursue additional office opportunities in targeted Austin sub-markets and plan to co-invest in acquisitions that meet certain investment criteria.

Based upon the facts and circumstances at formation of the Austin Venture, the Company determined that the Austin Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the voting interest model under the accounting standard for consolidation in order to determine whether to consolidate the Austin Venture. Based upon each member's substantive participating rights over the activities of the Austin Venture under the operating and related agreements of the Austin Venture, it is not consolidated by the Company, and is accounted for under the equity method of accounting. As a result, the Company measured its equity interest at fair value based on the fair value of the Austin Properties and the distribution provisions of the real estate venture agreement. Since the Company retains a non-controlling interest in the Austin Properties and there are no other facts and circumstances that preclude the consummation of a sale, the contribution qualifies as a partial sale of real estate under the relevant guidance for sales of real estate. Accordingly, during the fourth quarter of 2013, the Company recorded a gain of approximately $25.9 million, which is reflected in "Net gain (loss) on real estate venture transactions" on the accompanying statement of operations.

The Company's continuing involvement with the properties through its interest in the Venture and its management and leasing activities represents a significant continuing involvement in the properties. Accordingly, under the accounting standard for reporting discontinued operations, the Company has determined that the gain on partial sale and the operations of the properties should not be included as part of discontinued operations in its consolidated statements of operations.

4040 Wilson Venture

On July 31, 2013, the Company formed 4040 Wilson LLC Venture ("4040 Wilson"), a joint venture between the Company and Ashton Park Associates LLC (“Ashton Park”), an unaffiliated third party. Each of the Company and Ashton Park owns a 50% interest in 4040 Wilson. 4040 Wilson expects to construct a 426,900 square foot office representing the final phase of the eight building, mixed-use, Liberty Center complex developed by the parent company of Ashton Park in the Ballston submarket of Arlington, Virginia. 4040 Wilson expects to develop the office building on a 1.3-acre land parcel contributed by Ashton Park to 4040 Wilson at an agreed upon value of $36.0 million. The total estimated project costs are $194.1 million, which the Company expects will be financed through approximately $72.0 million of partner capital contributions (consisting of land with a value of $36.0 million from Ashton Park and $36.0 million in cash from the Company, of which $13.5 million has been funded to date) and approximately $125.1 million of debt financing through a construction lender that has not yet been determined. As part of the 4040 Wilson venture, the Company has agreed to guarantee 100% of any lender mandated recourse. As of December 31, 2013, the Company had not provided any guarantees in respect of 4040 Wilson.

Based upon the facts and circumstances at formation of 4040 Wilson, the Company determined that 4040 Wilson is a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate 4040 Wilson. Based upon each member's shared power over the activities of 4040 Wilson under the operating and related agreements of 4040 Wilson, and the Company's lack of control over the development and construction phases of the project, 4040 Wilson is not consolidated by the Company, and is accounted for under the equity method of accounting.

Two and Six Tower Bridge Exchange Transaction

On June 19, 2013, the Company acquired, from an unaffiliated third party, the third party's ownership interest in the Six Tower Bridge real estate venture through a nonmonetary exchange for the Company's ownership interest in the Two Tower Bridge real estate venture. The Six Tower Bridge real estate venture owns an unencumbered office property in Conshohocken, PA. The Company previously accounted for its noncontrolling interest in Six Tower Bridge using the equity method. As a result of the exchange transaction, the Company obtained control of the Six Tower Bridge property and the Company's existing equity interest was remeasured at fair value based on the fair value of the underlying property and the distribution provisions of the real estate venture agreement. Accordingly, during 2013, the Company recorded a gain of approximately $7.8 million, which is reflected in "Net gain from remeasurement of investments in a real estate ventures" on the accompanying statement of operations. Following the acquisition, the Class A office property in Conshohocken, PA is wholly owned by the Company with an unencumbered fair value of $24.5 million. The Company accounted for this transaction as a business combination and allocated the fair value as follows: $14.8 million to building, $6.9 million to land, $3.3 million to intangible assets and $0.5 million to below market lease liabilities assumed.

As mentioned above, the Company exchanged its non-controlling interest in Two Tower Bridge real estate venture in a nonmonetary transaction with an unaffiliated third party for the third party's interest in the Six Tower Bridge real estate venture. The investment in Two Tower Bridge had a fair value of $3.6 million on the date of the exchange transaction based on the fair value of the venture's equity and the distribution provisions of the real estate venture agreement. Based on this fair value and the carrying value for the Company's investment of $(0.1) million, during 2013 the Company recognized a gain on exchange ofinterests in real estate venturesof $3.7 million, which is reflected in "Net gain (loss) on real estate venture transactions" on the accompanying statement of operations.

evo at Cira Centre South Venture (formerly the Grove Venture)

On January 25, 2013, the Company formed HSRE-Campus Crest IX Real Estate Venture ("evo at Cira"), a joint venture among the Company and two unaffiliated third parties: Campus Crest Properties, LLC ("Campus Crest") and HSRE-Campus Crest IXA, LLC ("HSRE"). evo at Cira has commenced construction of a 33-story, 850-bed student housing tower located in the University City submarket of Philadelphia, Pennsylvania. Each of the Company and Campus Crest owns a 30% interest in evo at Cira and HSRE owns a 40% interest. evo at Cira is developing the project on a one-acre land parcel held under a long-term ground lease with a third party lessor. The Company contributed to evo at Cira its tenancy rights under a long-term ground lease, together with associated development rights, at an agreed-upon value of $8.5 million. The total estimated project costs are $158.5 million, which will be financed through partner capital contributions totaling $60.7 million, with the remaining $97.8 million being financed through construction facilities provided by PNC Bank, Capital One and First Niagara Bank. As of December 31, 2013, we have funded 100% of our share of the equity contributions. Construction has already commenced, with a targeted project completion in 2014.

In connection with the development of evo at Cira, each of the Company and Campus Crest provided, in addition to customary non-recourse carve-out guarantees, a completion and cost overrun guaranty, as well as a payment guaranty, on the construction financing (with the Company's share of the payment guaranty being approximately $24.7 million).

The Company's historical cost basis in the development rights that it contributed to the evo at Cira was $4.0 million, thus creating a $4.5 million basis difference at December 31, 2013 between the Company's initial outside investment basis and its $8.5 million initial equity basis. As this basis difference is not related to a physical land parcel, but rather to development rights to construct evo at Cira, the Company will accrete the basis difference as a reduction of depreciation expense over the life of evo at Cira's assets.

Based upon the facts and circumstances at evo at Cira formation, the Company determined that evo at Cira is a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate the evo at Cira. Based upon each member's shared power over the activities of evo at Cira under the operating and related agreements of evo at Cira, and the Company's lack of exclusive control over the development and construction phases of the project, evo at Cira is not consolidated by the Company, and is accounted for under the equity method of accounting. Accordingly, the land parcel and associated development rights contributed by the Company to evo at Cira were deconsolidated by the Company upon formation of evo at Cira.

BDN Beacon Venture

On March 26, 2013, the Company sold its entire 20% ownership interest in an unconsolidated real estate venture known as BDN Beacon Venture LLC (the "Beacon Venture"). The carrying amount of the Company's investment in the Beacon Venture amounted to $17.0 million at the sale date, with the Company's proceeds effectively matching the carrying amount.

Guarantees

As of December 31, 2013, the Company has provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guaranty on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for a project being undertaken by TB-BDN Plymouth Apartments; and (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures the Company provided and expects to continue to provide cost overrun and completion guarantees, with rights of contribution among partners in the venture, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements.

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Intangible Assets

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

As of December 31, 2013 and 2012, the Company’s intangible assets were comprised of the following (in thousands):

	December 31, 2013
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	150,782	$	(35,607	)	$	115,175
Tenant relationship value	38,692		(26,868		)	11,824
Above market leases acquired	6,673		(1,343		)	5,330
Total	$	196,147	$	(63,818	)	$	132,329
Below market leases acquired	$	81,991	$	(47,547	)	$	34,444

	December 31, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	87,909	$	(42,894	)	$	45,015
Tenant relationship value	56,137		(37,389		)	18,748
Above market leases acquired	8,565		(1,708		)	6,857
Total	$	152,611	$	(81,991	)	$	70,620
Below market leases acquired	$	77,083	$	(43,224	)	$	33,859

For the years ended December 31, 2013, 2012, and 2011, the Company wrote-off through the acceleration of amortization approximately $1.6 million, $1.4 million and $7.4 million, respectively, of intangible assets as a result of tenant move-outs prior to the end of the associated lease term. For the years ended December 31, 2013 and December 31, 2012, the Company accelerated amortization of a nominal amount of intangible liabilities as a result of tenant move-outs. For the year ended December 31, 2011, the Company accelerated amortization of $0.2 million of intangible liabilities as a result of tenant move-outs.

As of December 31, 2013, the Company’s annual amortization for its intangible assets/liabilities was as follows (in thousands, and assuming no early lease terminations):

	Assets		Liabilities
2014	$	27,043	$	7,614
2015	23,314		5,455
2016	18,573		3,486
2017	16,573		2,890
2018	12,161		2,353
Thereafter	34,665		12,646
Total	$	132,329	$	34,444

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Real Estate Investments, Gross Carrying Value of Company's Properties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gross carrying value of rental properties
Land	$ 680,513	$ 662,107
Building and improvements	3,504,060	3,576,065
Tenant improvements	484,716	487,997
Rental properties	$ 4,669,289	$ 4,726,169	$ 4,793,080

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Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Preferred Units [Line Items]
Preferred shares, dividend rate (as a percent)									6.90%
Numerator
Income (loss) from continuing operations, Basic									$ 38,982	$ (37,309)	$ (24,556)
Income (loss) from continuing operations, Diluted									38,982	(37,309)	(24,556)
Net income (loss) from continuing operations attributable to non-controlling interests, Basic									(357)	863	994
Net income (loss) from continuing operations attributable to non-controlling interests, Diluted									(357)	863	994
Amount allocated to unvested restricted shareholders/unitholders, Basic									(363)	(376)	(505)
Amount allocable to unvested restricted shareholders, Diluted									(363)	(376)	(505)
Preferred share/unit dividends, Basic									(6,900)	(10,405)	(7,992)
Preferred share/unit dividends, Diluted									(6,900)	(10,405)	(7,992)
Preferred share/unit redemption premium, basic									0	(4,052)	0
Preferred share/unit redemption Premium, Diluted									0	(4,052)	0
Income Loss from continuing operations available to common shareholders/unitholders, Basic									31,362	(51,279)	(32,059)
Income (loss) from continuing operations available to common unit holders, Diluted									31,362	(51,279)	(32,059)
Discontinued operations attributable to common unitholders									4,207	43,838	19,841
Income (loss) from discontinued operations, Diluted									4,207	43,838	19,841
Discontinued operations attributable to non-controlling interests - LP units									(55)	(797)	(778)
Discontinued operations attributable to non-controlling interests, diluted									(55)	(797)	(778)
Discontinued operations attributable to common shareholders, Basic									4,152	43,041	19,063
Discontinued operations attributable to common shareholders, Diluted									4,152	43,041	19,063
Net income (loss) attributable to Common Shareholders/Unitholders									35,514	(8,238)	(12,996)
Net income (loss) available to common shareholders/unitholders, Diluted									$ 35,514	$ (8,238)	$ (12,996)
Denominator
Weighted-average shares/units outstanding, Basic									153,140,458	143,257,097	135,444,424
Contingent securities/Stock based compensation									1,273,853	0	0
Weighted-average shares/units outstanding, Diluted									154,414,311	143,257,097	135,444,424
Earnings per Common Share:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic									$ 0.20	$ (0.36)	$ (0.24)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted									$ 0.20	$ (0.36)	$ (0.24)
Discontinued operations attributable to common shareholders/unitholders, Basic									$ 0.03	$ 0.30	$ 0.14
Discontinued operations attributable to common shareholders, Diluted									$ 0.03	$ 0.30	$ 0.14
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)

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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $)	12 Months Ended						12 Months Ended			0 Months Ended			0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2013 Room sqft Real_Estate_Ventures Buildings acre	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 BDN Beacon Venture LLC [Member]	Mar. 26, 2013 BDN Beacon Venture LLC [Member]	Dec. 31, 2013 Austin Joint Venture [Member]	Dec. 31, 2013 Two Tower Bridge [Member]		Jun. 19, 2013 Two Tower Bridge [Member]	Jul. 31, 2013 4040 Wilson Venture [Member] acre	Dec. 31, 2013 4040 Wilson Venture [Member]	Oct. 16, 2013 4040 Wilson Venture [Member] sqft	Jun. 19, 2013 Six Tower Bridge [Member]	Dec. 31, 2013 Six Tower Bridge [Member]		Dec. 31, 2013 The Grove at Cira Centre South [Member]	Jan. 25, 2013 The Grove at Cira Centre South [Member] Storey acre beds	Dec. 31, 2013 TB-BDN Plymouth Apartments [Member]	Dec. 31, 2013 PJP VII [Member]	Dec. 31, 2013 The Grove at Cira Centre South [Member]	Jul. 31, 2013 Ashton Park [Member] 4040 Wilson Venture [Member]	Dec. 31, 2013 Brandywine Realty Trust [Member] Austin Joint Venture [Member]	Oct. 16, 2013 Brandywine Realty Trust [Member] Austin Joint Venture [Member] Properties sqft	Jul. 31, 2013 Brandywine Realty Trust [Member] 4040 Wilson Venture [Member]	Dec. 31, 2013 Brandywine Realty Trust [Member] 4040 Wilson Venture [Member]	Oct. 16, 2013 Brandywine Realty Trust [Member] 4040 Wilson Venture [Member]	Oct. 16, 2013 DRA Advisors LLC [Member] Austin Joint Venture [Member]	Jan. 25, 2013 Campus Crest Properties, LLC [Member] The Grove at Cira Centre South [Member]	Jan. 25, 2013 HSRE, LLC [Member] [Member] The Grove at Cira Centre South [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties contributed to a joint venture																							7
Area of Real Estate Property												426,900											1,398,826
Aggregate gross sales price of a joint venture																							$ 330,000,000
Equity method investment, agreement to pay future capital expenditures																							5,200,000			800,000
Equity Method Investment, Distribution, Net of Initial Funding Agreement																											266,300,000
Potential future capital contributions under joint ventures which are not contractually binding																							100,000,000
Net gain (loss) on real estate venture transactions	29,604,000	(950,000)	(222,000)																			25,900,000
Amount Of Participant Contribution																											49,700,000
Equity method investments, Closing costs																											1,900,000
Closing Prorations and Lender Holdbacks																											6,900,000
Proceeds from Equity Method Investment, Dividends or Distributions	7,496,000	5,109,000	10,316,000																								271,500,000
Number of floors of a building																	33
Student housing bed capacity																	850
Equity Method Investment, Ownership Percentage				20.00%	20.00%	50.00%	35.00%	[1]		50.00%	50.00%			63.00%	[2]								50.00%				50.00%	30.00%	40.00%
Equity Method Investment, Additional Distribution Rights																							10.00%
Non-Recourse Debt																											230,600,000
Equity Method Investment, Budgeted Total Project Cost										194,100,000						158,500,000
Payments to Acquire Equity Method Investments	33,069,000	65,354,000	5,277,000							72,000,000						60,700,000
Payments to Acquire Interest in Joint Venture																								36,000,000	13,500,000
Construction Loan										125,100,000						97,800,000
Equity Method Investment, Aggregate Cost																	4,000,000
Company's share of equity (Company's basis)	180,512,000	193,555,000	115,807,000	0	17,000,000	17,262,000	0		(100,000)		13,499,000			0
Net gain on real estate venture transactions	3,683,000	0	0				3,683,000
Number of unconsolidated Real Estate Ventures	17
Number of real estate ventures that owns 51 office buildings	11
Number of office buildings owned by 15 Real Estate Ventures	55
Net rentable square feet of 51 office buildings owned the 15 Real Estate Ventures	5,700,000
Number of real estate ventures that owns undeveloped land	2
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	3.8									1.3							1
Number of real estate ventures that owns land under development	3
Area Owned By Real Estate Venture in Parcels Of Land Under Development	22.5
Fair value of land, net of amount encumbered																					36,000,000
Equity Method Investment, Underlying Equity in Net Assets																	8,500,000
Number of real estate ventures developed hotel property	1
Number of rooms in a hotel property developed by one Real Estate Venture	137
Minimum ownership interest in unconsolidated Real Estate Ventures	20.00%
Maximum ownership interest in unconsolidated Real Estate Ventures	65.00%
Net gain from remeasurement of investments in real estate ventures	6,866,000	0	0											7,800,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value													24,500,000
Business Acquisition Purchase Price Allocation Building													14,800,000
Business Acquisition Purchase Price Allocation, Land Portion													6,900,000
Business Acquisition Purchase Price Allocation Intangible Assets													3,300,000
Business Acquisition Purchase Price Allocated To Market Lease Liabilities													500,000
Investments, Fair Value Disclosure									3,600,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity																	4,500,000
Guarantor Obligations, Current Carrying Value																		$ 3,200,000	$ 500,000	$ 24,700,000

[1] (i)The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.

[2] (g)On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.

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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Real Estate, Federal Income Tax Basis	$ 4,000,000,000
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance at Beginning of Period	16,646,000	15,485,000	15,222,000
Valuation Allowances and Reserves, Additions	1,384,000	1,891,000	928,000
Valuation Allowances and Reserves, Deductions	1,782,000	730,000	665,000
Valuation Allowances and Reserves, Balance at End of Period	$ 16,248,000	$ 16,646,000	$ 15,485,000

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Real Estate Investments Real Estate Investments, Pro Forma of Acquired Properties (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pro Forma [Abstract]
Business Acquisition, Pro Forma Revenue									$ 610,979	$ 592,753
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax									21,805	(60,011)
Business Acquisition, Pro Forma Net Income (Loss)									$ 25,957	$ (16,970)
Continuing operations (in dollars per share)									$ 0.20	$ (0.36)	$ (0.24)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic									$ 0.14	$ (0.42)
Income (Loss) from Continuing Operations, Per Diluted Share									$ 0.20	$ (0.36)	$ (0.24)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted									$ 0.14	$ (0.42)
Earnings Per Share, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Pro Forma, Earnings Per Share, Basic									$ 0.17	$ (0.12)
Earnings Per Share, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Pro Forma Earnings Per Share, Diluted									$ 0.17	$ (0.12)

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Share Based and Deferred Compensation 401(K) Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.4

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Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2013

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
PENNSYLVANIA SUBURBS
400 Berwyn Park	Berwyn	PA	—	2,657	4,462	13,711		2,657	18,172	20,829	5,478	1999	1999	40
300 Berwyn Park	Berwyn	PA	—	2,206	13,422	4,176		2,206	17,598	19,804	8,004	1989	1997	40
1050 Westlakes Drive	Berwyn	PA	—	2,611	10,445	5,046		2,611	15,490	18,101	7,264	1984	1999	40
1200 Swedesford Road	Berwyn	PA	—	2,595	11,809	3,533		2,595	15,341	17,936	5,464	1994	2001	40
200 Berwyn Park	Berwyn	PA	—	1,533	9,460	2,255		1,533	11,714	13,247	5,246	1987	1997	40
1180 Swedesford Road	Berwyn	PA	—	2,086	8,342	2,628		2,086	10,969	13,055	3,113	1987	2001	40
100 Berwyn Park	Berwyn	PA	—	1,180	7,290	2,173		1,180	9,462	10,642	4,241	1986	1997	40
1160 Swedesford Road	Berwyn	PA	—	1,781	7,124	1,412		2,088	8,228	10,316	2,491	1986	2001	40
1100 Cassett Road	Berwyn	PA	—	1,695	6,779	1,267		1,695	8,046	9,741	2,275	1997	2001	40
980 Harvest Drive	Blue Bell	PA	—	3,304	16,960	(110	)	3,303	16,850	20,153	6,542	1988	2002	40
925 Harvest Drive	Blue Bell	PA	—	1,671	6,606	759		1,671	7,364	9,035	3,265	1990	1998	40
920 Harvest Drive	Blue Bell	PA	—	1,209	6,595	(528	)	1,209	6,068	7,277	2,898	1990	1998	40
181 Washington Street	Conshohocken	PA	—	6,927	14,722	634		6,927	15,357	22,284	217	1999	2013	40
426 Lancaster Avenue	Devon	PA	—	1,689	6,756	395		1,689	7,152	8,841	3,259	1990	1998	40
52 Swedesford Square	East Whiteland Twp.	PA	—	4,241	16,579	2,630		4,241	19,209	23,450	7,560	1988	1998	40
One Progress Drive	Horsham	PA	—	1,399	5,629	5,214		1,399	10,843	12,242	3,818	1986	1996	40
500 Enterprise Drive	Horsham	PA	—	1,303	5,188	3,228		1,303	8,416	9,719	3,577	1990	1996	40
640 Freedom Business Center	King Of Prussia	PA	—	4,222	16,891	3,450		4,222	20,341	24,563	8,747	1991	1998	40
555 Croton Road	King of Prussia	PA	—	4,486	17,943	1,330		4,486	19,273	23,759	6,143	1999	2001	40
630 Allendale Road	King of Prussia	PA	—	2,836	4,028	12,223		2,636	16,450	19,086	5,264	2000	2000	40
620 Freedom Business Center	King Of Prussia	PA	—	2,770	11,014	3,755		2,770	14,770	17,540	7,286	1986	1998	40
1000 First Avenue	King Of Prussia	PA	—	2,772	10,936	2,787		2,772	13,723	16,495	5,949	1980	1998	40
1060 First Avenue	King Of Prussia	PA	—	2,712	10,953	2,728		2,712	13,681	16,393	6,016	1987	1998	40
630 Freedom Business Center	King Of Prussia	PA	—	2,773	11,144	1,971		2,773	13,115	15,888	5,856	1989	1998	40
1020 First Avenue	King Of Prussia	PA	—	2,168	8,576	4,522		2,168	13,098	15,266	5,999	1984	1998	40
1040 First Avenue	King Of Prussia	PA	—	2,860	11,282	586		2,860	11,868	14,728	4,859	1985	1998	40
610 Freedom Business Center	King Of Prussia	PA	—	2,017	8,070	2,369		2,017	10,440	12,457	4,388	1985	1998	40
650 Park Avenue	King Of Prussia	PA	—	1,916	4,378	1,771		1,916	6,149	8,065	2,722	1968	1998	40
500 North Gulph Road	King Of Prussia	PA	—	1,303	5,201	1,548		1,303	6,749	8,052	3,151	1979	1996	40
741 First Avenue	King Of Prussia	PA	—	1,287	5,151	11		1,287	5,162	6,449	2,242	1966	1998	40
751-761 Fifth Avenue	King Of Prussia	PA	—	1,097	4,391	31		1,097	4,422	5,519	1,917	1967	1998	40
620 Allendale Road	King Of Prussia	PA	—	1,020	3,839	654		1,020	4,493	5,513	1,869	1961	1998	40
600 Park Avenue	King Of Prussia	PA	—	1,012	4,048	385		1,012	4,433	5,445	1,925	1964	1998	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
660 Allendale Road	King Of Prussia	PA	—	396	948	2,957		1,085	3,216	4,301	623	2011	1998	40
640 Allendale Road	King of Prussia	PA	—	439	432	1,579		439	2,012	2,451	722	2000	2000	40
101 Lindenwood Drive	Malvern	PA	—	4,152	16,606	3,722		4,152	20,329	24,481	6,569	1988	2001	40
301 Lindenwood Drive	Malvern	PA	—	2,729	10,915	2,667		2,729	13,582	16,311	4,424	1984	2001	40
300 Lindenwood Drive	Malvern	PA	—	848	3,394	1,265		848	4,659	5,507	1,889	1991	2001	40
100 Lindenwood Drive	Malvern	PA	—	473	1,892	208		473	2,100	2,573	729	1985	2001	40
200 Lindenwood Drive	Malvern	PA	—	324	1,295	339		324	1,634	1,958	557	1984	2001	40
14 Campus Boulevard	Newtown Square	PA	—	2,244	4,217	1,515		2,244	5,733	7,977	2,984	1998	1998	40
17 Campus Boulevard	Newtown Square	PA	—	1,108	5,155	(397	)	1,108	4,758	5,866	1,519	2001	1997	40
11 Campus Boulevard	Newtown Square	PA	—	1,112	4,067	672		1,112	4,739	5,851	1,812	1998	1999	40
15 Campus Boulevard	Newtown Square	PA	—	1,164	3,896	228		1,164	4,125	5,289	1,267	2002	2000	40
18 Campus Boulevard	Newtown Square	PA	—	787	3,312	(183	)	787	3,129	3,916	1,525	1990	1996	40
401 Plymouth Road	Plymouth Meeting	PA	—	6,198	16,131	17,096		6,198	33,226	39,424	10,394	2001	2000	40
4000 Chemical Road	Plymouth Meeting	PA	—	4,373	24,546	3,292		4,373	27,838	32,211	5,628	2006	2001	40
610 West Germantown Pike	Plymouth Meeting	PA	—	3,651	14,514	3,299		3,651	17,813	21,464	5,285	1987	2002	40
600 West Germantown Pike	Plymouth Meeting	PA	—	3,652	15,288	2,064		3,652	17,352	21,004	5,119	1986	2002	40
630 West Germantown Pike	Plymouth Meeting	PA	—	3,558	14,743	1,770		3,558	16,513	20,071	5,462	1988	2002	40
620 West Germantown Pike	Plymouth Meeting	PA	—	3,572	14,435	1,607		3,572	16,042	19,614	5,140	1990	2002	40
660 West Germantown Pike(d)	Plymouth Meeting	PA	—	—	—	17,488		—	17,488	17,488	688	1987	2012	30
2240/2250 Butler Pike	Plymouth Meeting	PA	—	1,104	4,627	1,333		1,104	5,960	7,064	3,324	1984	1996	40
2260 Butler Pike	Plymouth Meeting	PA	—	661	2,727	1,242		661	3,969	4,630	2,052	1984	1996	40
120 West Germantown Pike	Plymouth Meeting	PA	—	685	2,773	961		685	3,735	4,420	1,812	1984	1996	40
140 West Germantown Pike	Plymouth Meeting	PA	—	481	1,976	160		481	2,135	2,616	1,017	1984	1996	40
351 Plymouth Road	Plymouth Meeting	PA	—	1,043	555	—		1,043	555	1,598	121	N/A	2000	40
150 Radnor Chester Road	Radnor	PA	—	11,925	36,986	11,799		11,896	48,813	60,709	15,790	1983	2004	29
One Radnor Corporate Center	Radnor	PA	—	7,323	28,613	22,975		7,322	51,588	58,910	15,805	1998	2004	29
201 King of Prussia Road	Radnor	PA	—	8,956	29,811	5,214		8,948	35,032	43,980	13,938	2001	2004	25

555 Lancaster Avenue	Radnor	PA	—	8,014	16,508	18,993	8,609	34,906	43,515	12,970	1973	2004	24
Four Radnor Corporate Center	Radnor	PA	—	5,406	21,390	11,967	5,705	33,058	38,763	12,752	1995	2004	30
Five Radnor Corporate Center	Radnor	PA	—	6,506	25,525	5,124	6,578	30,577	37,155	6,918	1998	2004	38
Three Radnor Corporate Center	Radnor	PA	—	4,773	17,961	2,715	4,791	20,658	25,449	7,226	1998	2004	29
Two Radnor Corporate Center	Radnor	PA	—	3,937	15,484	3,872	3,942	19,350	23,292	6,031	1998	2004	29
130 Radnor Chester Road	Radnor	PA	—	2,573	8,338	3,491	2,567	11,834	14,401	3,825	1983	2004	25
170 Radnor Chester Road	Radnor	PA	—	2,514	8,147	1,678	2,509	9,831	12,340	3,316	1983	2004	25
200 Radnor Chester Road (d)	Radnor	PA	—	—	—	842	—	842	842	—	N/A	2005	N/A

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
101 West Elm Street	W. Conshohocken	PA	—	6,251	25,209	2,784		6,251	27,992	34,243	6,556	1999	2005	40
1 West Elm Street	W. Conshohocken	PA	—	3,557	14,249	1,115		3,557	15,364	18,921	3,626	1999	2005	40
595 East Swedesford Road	Wayne	PA	—	2,729	10,917	2,307		2,729	13,225	15,954	3,946	1998	2003	40
575 East Swedesford Road	Wayne	PA	—	2,178	8,712	1,681		2,178	10,393	12,571	3,255	1985	2003	40
565 East Swedesford Road	Wayne	PA	—	1,872	7,489	1,820		1,872	9,309	11,181	2,840	1984	2003	40
585 East Swedesford Road	Wayne	PA	—	1,350	5,401	116		1,350	5,517	6,867	1,397	1998	2003	40
PHILADELPHIA CBD
2970 Market Street	Philadelphia	PA	190,964	22,430	217,763	10,591		22,430	228,354	250,784	21,169	2010	2007	40
2929 Arch Street	Philadelphia	PA	—	—	208,570	29,291		12,482	225,380	237,862	74,828	2005	N/A	40
1717 Arch Street	Philadelphia	PA	—	—	98,188	52,953		25,195	125,946	151,141	12,294	1990	2010	40
2001 Market Street	Philadelphia	PA	112,000	15,323	120,842	(642	)	15,323	120,200	135,523	107	1992	2013	40
130 North 18th Street	Philadelphia	PA	—	14,496	107,736	11,782		14,473	119,541	134,014	37,538	1998	2004	34
100 North 18th Street	Philadelphia	PA	88,583	16,066	100,255	6,038		16,066	106,293	122,359	32,227	1988	2004	36
2005 Market Street	Philadelphia	PA	125,089	15,161	122,486	(17,465	)	15,161	105,021	120,182	94	1987	2013	40
2930 Chestnut Street	Philadelphia	PA	40,101	—	76,008	2,586		—	78,594	78,594	6,606	2010	N/A	40
1900 Market Street	Philadelphia	PA	—	7,768	17,263	64		7,768	17,327	25,095	629	1981	2012	30
3020 Market Street	Philadelphia	PA	—	—	21,417	3,010		—	24,427	24,427	2,144	1959	2011	26
101 - 103 Juniper Street	Philadelphia	PA	—	—	14,401	324		478	14,247	14,725	1,340	2010	2006	40
Philadelphia Marine Center	Philadelphia	PA	—	532	2,196	3,196		628	5,296	5,924	2,186	Various	1998	40
METROPOLITAN WASHINGTON, D.C.
11720 Beltsville Drive	Beltsville	MD	—	3,831	16,661	3,982		3,903	20,571	24,474	5,743	1987	2006	46
11700 Beltsville Drive	Beltsville	MD	—	2,808	12,081	292		2,863	12,319	15,182	2,415	1981	2006	46
11710 Beltsville Drive	Beltsville	MD	—	2,278	11,100	(814	)	2,321	10,243	12,564	2,096	1987	2006	46
6600 Rockledge Drive	Bethesda	MD	—	—	37,421	11,538		—	48,960	48,960	12,867	1981	2006	50
11740 Beltsville Drive	Bethesda	MD	—	198	870	42		202	908	1,110	189	1987	2006	46
12015 Lee Jackson Memorial Highway	Fairfax	VA	—	3,770	22,895	3,665		3,842	26,489	30,331	6,016	1985	2006	42
11781 Lee Jackson Memorial Highway	Fairfax	VA	—	3,246	19,836	24		3,307	19,800	23,107	4,092	1982	2006	40
4401 Fair Lakes Court	Fairfax	VA	—	1,569	11,982	237		1,599	12,190	13,789	2,202	1988	2006	52
3141 Fairview Park Drive (e)	Falls Church	VA	21,630	5,918	40,981	11,545		7,081	51,365	58,446	9,049	1988	2006	51
2340 Dulles Corner Boulevard	Herndon	VA	—	16,345	65,379	18,280		16,129	83,875	100,004	24,559	1987	2006	40
2291 Wood Oak Drive	Herndon	VA	—	8,243	52,413	13,499		8,782	65,373	74,155	11,311	1999	2006	55
196/198 Van Buren Street	Herndon	VA	—	7,931	43,812	8,709		8,348	52,104	60,452	8,594	1991	2006	53
2251 Corporate Park Drive	Herndon	VA	—	11,472	45,893	2,055		11,472	47,948	59,420	8,434	2000	2006	40
2355 Dulles Corner Boulevard	Herndon	VA	—	10,365	43,876	4,528		10,365	48,405	58,770	10,863	1988	2006	40
2411 Dulles Corner Park	Herndon	VA	—	7,279	46,340	3,508		7,417	49,710	57,127	10,475	1990	2006	50
13880 Dulles Corner Lane	Herndon	VA	—	7,236	39,213	2,498		7,373	41,574	48,947	6,634	1997	2006	55

							Gross Amount at Which Carried
				Initial Cost			December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition	Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
2121 Cooperative Way	Herndon	VA	—	5,598	38,639	2,292	5,795	40,734	46,529	6,598	2000	2006	54
2201 Cooperative Way	Herndon	VA	—	4,809	34,093	2,349	4,809	36,442	41,251	5,921	1990	2006	54
13825 Sunrise Valley Drive	Herndon	VA	—	3,794	19,365	1,032	3,866	20,326	24,192	3,521	1989	2006	46
1676 International Drive	Mclean	VA	59,698	18,437	97,538	2,501	18,785	99,691	118,476	17,693	1999	2006	55
8260 Greensboro Drive	Mclean	VA	31,697	7,952	33,964	1,794	8,102	35,608	43,710	6,461	1980	2006	52
1880 Campus Commons Drive	Reston	VA	—	6,164	28,114	6,315	6,281	34,312	40,593	5,754	1985	2006	52
2273 Research Boulevard	Rockville	MD	—	5,167	31,110	3,589	5,237	34,628	39,865	8,658	1999	2006	45
2275 Research Boulevard	Rockville	MD	—	5,059	29,668	2,964	5,154	32,537	37,691	6,474	1990	2006	45
2277 Research Boulevard	Rockville	MD	—	4,649	26,952	695	4,733	27,563	32,296	5,014	1986	2006	45
1900 Gallows Road	Vienna	VA	—	7,797	47,817	9,619	7,944	57,288	65,232	9,483	1989	2006	52
8521 Leesburg Pike	Vienna	VA	—	4,316	30,885	3,198	4,397	34,002	38,399	5,192	1984	2006	51
NEW JERSEY/DELAWARE
457 Haddonfield Road	Cherry Hill	NJ	—	2,142	9,120	1,334	2,142	10,454	12,596	4,884	1990	1996	40
200 Lake Drive East	Cherry Hill	NJ	—	2,069	8,275	1,299	2,069	9,573	11,642	3,264	1989	2001	40
220 Lake Drive East	Cherry Hill	NJ	—	2,144	8,798	646	2,144	9,443	11,587	3,152	1988	2001	40
210 Lake Drive East	Cherry Hill	NJ	—	1,645	6,579	1,110	1,645	7,689	9,334	2,509	1986	2001	40
20 East Clementon Road	Gibbsboro	NJ	—	769	3,055	530	769	3,585	4,354	1,574	1986	1997	40
10 Foster Avenue	Gibbsboro	NJ	—	244	971	78	244	1,049	1,293	470	1983	1997	40
7 Foster Avenue	Gibbsboro	NJ	—	231	921	123	231	1,044	1,275	435	1983	1997	40
50 East Clementon Road	Gibbsboro	NJ	—	114	964	3	114	967	1,081	428	1986	1997	40
2 Foster Avenue	Gibbsboro	NJ	—	185	730	16	185	746	931	333	1974	1997	40
4 Foster Avenue	Gibbsboro	NJ	—	183	726	5	183	732	915	324	1974	1997	40
1 Foster Avenue	Gibbsboro	NJ	—	93	364	76	93	440	533	219	1972	1997	40
5 U.S. Avenue	Gibbsboro	NJ	—	21	81	3	21	84	105	37	1987	1997	40
5 Foster Avenue	Gibbsboro	NJ	—	9	32	26	9	58	67	27	1968	1997	40

1120 Executive Boulevard	Marlton	NJ	—	2,074	8,415	2,061	2,074	10,475	12,549	4,687	1987	1997	40
Two Eves Drive	Marlton	NJ	—	818	3,461	341	818	3,802	4,620	1,795	1987	1997	40
Five Eves Drive	Marlton	NJ	—	703	2,819	532	703	3,351	4,054	1,519	1986	1997	40
Four B Eves Drive	Marlton	NJ	—	588	2,369	420	588	2,789	3,377	1,328	1987	1997	40
Four A Eves Drive	Marlton	NJ	—	539	2,168	123	539	2,291	2,830	1,050	1987	1997	40
308 Harper Drive	Moorestown	NJ	—	1,643	6,663	929	1,643	7,592	9,235	3,155	1976	1998	40
10000 Midlantic Drive	Mt. Laurel	NJ	—	3,206	12,857	4,335	3,206	17,192	20,398	7,087	1990	1997	40
700 East Gate Drive	Mt. Laurel	NJ	—	3,569	14,436	2,094	3,569	16,530	20,099	7,269	1984	1998	40
15000 Midlantic Drive	Mt. Laurel	NJ	—	3,061	12,254	1,600	3,061	13,854	16,915	6,211	1991	1997	40
1000 Howard Boulevard	Mt. Laurel	NJ	—	2,297	9,288	3,922	2,297	13,210	15,507	5,277	1988	1997	40
1000 Atrium Way	Mt. Laurel	NJ	—	2,061	8,180	4,867	2,061	13,047	15,108	5,896	1989	1997	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013(c)	Year of Construction	Year Acquired	Depreciable Life
2000 Midlantic Drive	Mt. Laurel	NJ	—	2,202	8,823	2,490		2,202	11,313	13,515	4,752	1989	1997	40
701 East Gate Drive	Mt. Laurel	NJ	—	1,736	6,877	1,780		1,736	8,657	10,393	3,452	1986	1998	40
9000 Midlantic Drive	Mt. Laurel	NJ	—	1,472	5,895	1,880		1,472	7,776	9,248	3,142	1989	1997	40
307 Fellowship Drive	Mt. Laurel	NJ	—	1,565	6,342	1,292		1,565	7,634	9,199	3,189	1981	1998	40
305 Fellowship Drive	Mt. Laurel	NJ	—	1,421	5,768	1,611		1,421	7,378	8,799	2,831	1980	1998	40
303 Fellowship Drive	Mt. Laurel	NJ	—	1,493	6,055	851		1,493	6,907	8,400	2,902	1979	1998	40
309 Fellowship Drive	Mt. Laurel	NJ	—	1,518	6,154	644		1,518	6,798	8,316	2,927	1982	1998	40
1000 Bishops Gate	Mt. Laurel	NJ	—	934	6,287	412		934	6,700	7,634	2,350	2005	2000	40
161 Gaither Drive	Mt. Laurel	NJ	—	1,016	4,064	679		1,016	4,743	5,759	1,719	1987	2001	40
815 East Gate Drive	Mt. Laurel	NJ	—	636	2,584	708		636	3,292	3,928	1,353	1986	1998	40
4000 Midlantic Drive	Mt. Laurel	NJ	—	714	5,085	(1,982	)	714	3,103	3,817	1,455	1998	1997	40
817 East Gate Drive	Mt. Laurel	NJ	—	611	2,426	152		611	2,578	3,189	1,088	1986	1998	40
400 Commerce Drive	Newark	DE	—	2,528	9,220	1,048		2,528	10,268	12,796	3,627	1997	2002	40
100 Commerce Drive	Newark	DE	—	1,160	4,633	857		1,160	5,490	6,650	2,381	1989	1997	40
200 Commerce Drive	Newark	DE	—	911	4,414	1,018		911	5,432	6,343	2,012	1998	2002	40
Main Street - Plaza 1000	Voorhees	NJ	—	2,732	10,942	3,074		2,732	14,016	16,748	9,611	1988	1997	40
Main Street - Piazza	Voorhees	NJ	—	696	2,802	2,529		696	5,332	6,028	1,415	1990	1997	40
Main Street - Promenade	Voorhees	NJ	—	531	2,052	445		531	2,496	3,027	1,097	1988	1997	40
920 North King Street	Wilmington	DE	—	6,141	21,140	2,485		6,141	23,625	29,766	6,854	1989	2004	30
300 Delaware Avenue	Wilmington	DE	—	6,368	13,739	2,546		6,368	16,285	22,653	5,836	1989	2004	23
Two Righter Parkway	Wilmington	DE	—	2,802	11,217	6,264		2,802	17,481	20,283	4,069	1987	2001	40
One Righter Parkway	Wilmington	DE	—	2,545	10,195	5,088		2,545	15,282	17,827	7,982	1989	1996	40
RICHMOND
4364 South Alston Avenue	Durham	NC	—	1,622	6,419	1,031		1,580	7,491	9,071	3,010	1985	1998	40
4805 Lake Brooke Drive	Glen Allen	VA	—	1,640	6,567	1,136		1,640	7,703	9,343	2,953	1996	1998	40
Overlook I	Glen Allen	VA	—	748	3,976	600		790	4,533	5,323	439	1998	2011	40
Overlook II	Glen Allen	VA	—	748	4,492	77		790	4,526	5,316	475	2000	2011	40
2812 Emerywood Parkway	Henrico	VA	—	1,069	4,281	505		1,069	4,786	5,855	2,017	1980	1998	40
300 Arboretum Place	Richmond	VA	—	5,450	21,892	3,457		5,450	25,349	30,799	10,047	1988	1998	40
7501 Boulders View Drive	Richmond	VA	—	4,669	19,699	2,112		4,925	21,555	26,480	4,030	1989	2007	40
7300 Beaufont Springs Drive	Richmond	VA	—	4,672	19,689	1,906		4,922	21,345	26,267	3,534	2000	2007	40
6800 Paragon Place	Richmond	VA	—	4,552	18,414	2,020		4,552	20,434	24,986	4,057	1987	2006	40
6802 Paragon Place	Richmond	VA	—	2,917	11,454	2,912		2,917	14,366	17,283	4,666	1989	2002	40
1025 Boulders Parkway	Richmond	VA	—	2,574	11,297	1,573		2,824	12,620	15,444	2,100	1994	2007	40
2100-2116 West Laburnam Avenue	Richmond	VA	—	2,482	8,846	2,707		2,482	11,553	14,035	4,917	1984	1998	40
7401 Beaufont Springs Drive	Richmond	VA	—	2,349	10,396	992		2,599	11,138	13,737	1,904	1998	2007	40
7325 Beaufont Springs Drive	Richmond	VA	—	2,344	10,377	503		2,594	10,629	13,223	1,753	1999	2007	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013(a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2013 (c)	Year of Construction	Year Acquired	Depreciable Life
9011 Arboretum Parkway	Richmond	VA	—	1,857	7,702	906		1,857	8,609	10,466	3,571	1991	1998	40
6806 Paragon Place	Richmond	VA	—	—	10,288	(105	)	403	9,780	10,183	2,297	2007	2005	40
9100 Arboretum Parkway	Richmond	VA	—	1,362	5,489	761		1,362	6,250	7,612	2,591	1987	1998	40
2511 Brittons Hill Road	Richmond	VA	—	1,202	4,820	1,221		1,202	6,041	7,243	2,652	1987	1998	40
100 Gateway Centre Parkway	Richmond	VA	—	391	5,410	616		391	6,027	6,418	1,725	2001	1998	40
9200 Arboretum Parkway	Richmond	VA	—	985	3,973	1,225		985	5,198	6,183	2,136	1987	1998	40
9210 Arboretum Parkway	Richmond	VA	—	1,110	4,474	527		1,110	5,001	6,111	2,151	1988	1998	40
2201-2245 Tomlynn Street	Richmond	VA	—	1,020	4,067	793		1,020	4,860	5,880	1,944	1989	1998	40
9211 Arboretum Parkway	Richmond	VA	—	582	2,433	886		582	3,320	3,902	1,206	1991	1998	40
2221-2245 Dabney Road	Richmond	VA	—	530	2,123	349		530	2,472	3,002	889	1994	1998	40
2212-2224 Tomlynn Street	Richmond	VA	—	502	2,014	395		502	2,409	2,911	938	1985	1998	40
2244 Dabney Road	Richmond	VA	—	550	2,203	37		550	2,240	2,790	947	1993	1998	40
2277 Dabney Road	Richmond	VA	—	507	2,034	241		507	2,274	2,781	889	1986	1998	40
2248 Dabney Road	Richmond	VA	—	512	2,049	131		512	2,181	2,693	898	1989	1998	40
2161-2179 Tomlynn Street	Richmond	VA	—	423	1,695	315		423	2,010	2,433	764	1985	1998	40
2246 Dabney Road	Richmond	VA	—	455	1,822	18		455	1,840	2,295	770	1987	1998	40
2251 Dabney Road	Richmond	VA	—	387	1,552	110		387	1,662	2,049	703	1983	1998	40
2256 Dabney Road	Richmond	VA	—	356	1,427	235		356	1,662	2,018	746	1982	1998	40
2130-2146 Tomlynn Street	Richmond	VA	—	353	1,416	169		353	1,585	1,938	636	1988	1998	40
2120 Tomlynn Street	Richmond	VA	—	281	1,125	179		281	1,304	1,585	560	1984	1998	40
2240 Dabney Road	Richmond	VA	—	264	1,059	98		264	1,157	1,421	451	1984	1998	40
Boulders Land	Richmond	VA	—	1,256	—	28		1,259	25	1,284	—	N/A	2007	N/A

											Gross Amount at Which Carried
					Initial Cost						December 31, 2013
Property Name	City	State	Encumberances at December 31, 2013 (a)		Land		Building and Improvements		Net Improvements (Retirements) Since Acquisition		Land		Building and Improvements		Total (b)		Accumulated Depreciation at December 31, 2013 (c)		Year of Construction	Year Acquired	Depreciable Life
AUSTIN
11305 Four Points Drive	Austin	TX	—		962		35,894		36,856		962		35,894		36,856		—		2008	2013	40
CALIFORNIA
5900 & 5950 La Place Court	Carlsbad	CA	—		3,706		11,185		3,401		3,955		14,337		18,292		3,015		1988	2006	48
5963 La Place Court	Carlsbad	CA	—		2,824		9,413		2,197		2,999		11,435		14,434		2,164		1987	2006	55
2035 Corte Del Nogal	Carlsbad	CA	—		3,261		6,077		1,175		3,499		7,015		10,514		1,902		1991	2006	39
1200 Concord Avenue	Concord	CA	—		6,395		24,664		809		6,515		25,352		31,867		6,693		1984	2006	34
1220 Concord Avenue	Concord	CA	—		6,476		24,966		260		6,476		25,226		31,702		6,375		1984	2006	34
155 Grand Avenue	Oakland	CA	—		13,556		54,267		5,764		13,557		60,031		73,588		11,951		1990	2007	40
Two Kaiser Plaza	Oakland	CA	—		7,841		—		—		7,841		—		7,841		—		N/A	2006	N/A
Oakland Lot B	Oakland	CA	—		4,342		—		—		4,342		—		4,342		—		N/A	2006	N/A
	Total:		$	669,762	$	634,189	$	3,454,900	$	617,057	$	680,513	$	3,988,776	$	4,669,289	$	983,808

(a) Excludes the effect of any net interest premium/(discount).

(b) Reconciliation of Real Estate:

The following table reconciles the real estate investments from January 1, 2011 to December 31, 2013 (in thousands):

	2013			2012			2011
Balance at beginning of year	$	4,726,169		$	4,793,080		$	4,834,111
Additions:
Acquisitions	347,510			50,579			31,454
Capital expenditures and assets placed into service	109,740			90,619			133,550
Less:
Dispositions	(474,275		)	(168,408		)	(163,971		)
Retirements	(39,855		)	(39,701		)	(42,064		)
Balance at end of year	$	4,669,289		$	4,726,169		$	4,793,080

The aggregate cost for federal income tax purposes is $4.0 billion as of December 31, 2013.

(c) Reconciliation of Accumulated Depreciation:

The following table reconciles the accumulated depreciation on real estate investments from January 1, 2011 to December 31, 2013 (in thousands):

	2013			2012			2011
Balance at beginning of year	$	954,665		$	865,710		$	776,078
Additions:
Depreciation expense — continuing operations	150,236			154,095			157,691
Depreciation expense — discontinued operations	9,164			2,143			1,185
Less:
Dispositions	(91,890		)	(28,270		)	(62,022		)
Retirements	$	(38,367	)	$	(39,013	)	$	(7,222	)
Balance at end of year	$	983,808		$	954,665		$	865,710

(d) Total net improvements since acquisition for these development properties do not include amounts allocated to construction-in-progress, as shown within the Company's consolidated balance sheet as of December 31, 2013.

(e) This property was contributed to an unconsolidated real estate venture, however, the Company will continue to consolidate this property due to its continuing involvement in this property resulting from its ongoing lease at this property and its 50% ownership interest in the venture. Please see Note 3 to the consolidated financial statements for additional information.

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Operating Leases (Tables)

12 Months Ended

Dec. 31, 2013

Operating Leases [Abstract]

Operating Leases Future Minimum Payments Due [Table Text Block]

Year	Minimum Rent
2014	$	471,918
2015	457,315
2016	416,467
2017	358,368
2018	299,619
Thereafter	1,403,003

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Non Controlling Interests in The Parent Company

12 Months Ended

Dec. 31, 2013

Noncontrolling Interest [Abstract]

NON-CONTROLLING INTERESTS IN THE PARENT COMPANY

NON-CONTROLLING INTERESTS IN THE PARENT COMPANY'S FINANCIAL STATEMENTS

Non-controlling interests in the Parent Company’s financial statements relate to redeemable common limited partnership interests in the Operating Partnership held by parties other than the Parent Company and properties which are consolidated but not wholly owned.

Operating Partnership

The aggregate book value of the non-controlling interests associated with the redeemable common limited partnership interests that were consolidated in the accompanying consolidated balance sheet of the Parent Company as of December 31, 2013 and December 31, 2012, was $20.3 million and $21.2 million, respectively. The Parent Company believes that the aggregate settlement value of these interests (based on the number of units outstanding and the closing price of the common shares on the balance sheet date) was approximately $24.8 million and $22.5 million, respectively, as of December 31, 2013 and December 31, 2012.

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Tax Credit Transactions

12 Months Ended

Dec. 31, 2011

Income Tax Disclosure [Abstract]

TAX CREDIT TRANSACTIONS

TAX CREDIT TRANSACTIONS

Historic Tax Credit Transaction

On November 17, 2008, the Company closed a transaction with US Bancorp (“USB”) related to the historic rehabilitation of the IRS Philadelphia Campus, a 862,692 square foot office building that is 100% leased to the IRS. On August 27, 2010, the Company completed the development of the IRS Philadelphia Campus and the IRS lease commenced. In connection with this completed development project, USB contributed to the Company $64.1 million of total project costs.

In exchange for its contributions to the development of the IRS Philadelphia Campus, USB is entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB does not have a material interest in the underlying economics of the property. This transaction includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest in the IRS Philadelphia Campus. The Company believes the put will be exercised and the amount attributed to that puttable non-controlling interest obligation is included in other liabilities and is being accreted to the expected fixed put price.

Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide other guarantees to USB and that entitle the Company through fee arrangements to receive substantially all available cash flow from the IRS Philadelphia Campus, the Company concluded that the IRS Philadelphia Campus should be consolidated. The Company also concluded that capital contributions received from USB, in substance, are consideration that the Company receives in exchange for its obligation to deliver tax credits and other tax benefits to USB. These receipts other than the amounts allocated to the put obligation will be recognized as revenue in the consolidated financial statements beginning when the obligation to USB is relieved which occurs upon delivery of the expected tax benefits net of any associated costs. The tax credit is subject to 20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus. The total remaining USB contributions presented within the Company’s consolidated balance sheet amounted to $26.8 million as of December 31, 2013 and $39.1 million as of December 31, 2012. The contributions were recorded net of the amount allocated to non-controlling interest as described above of $2.8 million and $2.6 million at the end of the years ended December 31, 2013 and December 31, 2012, respectively, with the remaining balance being presented within deferred income. Beginning in September 2011 to September 2015, the Company recognized and will recognize the cash received as revenue net of allocated expenses over the five year credit recapture period as defined in the Internal Revenue Code within other income (expense) in its consolidated statements of operations. During the years-ended December 31, 2013 and 2012, the Company recognized $11.9 million of the cash received as revenue, net of $0.5 million of allocated expenses within other income (expense) in its consolidated statements of operations.

Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. The deferred cost at December 31, 2013 and December 31, 2012 is $1.0 million and $1.6 million, respectively, and are included in other assets in the Company’s consolidated balance sheet. Amounts included in interest expense related to the accretion of the non-controlling interest liability and the 2% return expected to be paid to USB on its non-controlling interest aggregate to $1.4 million for year-ended December 31, 2013 and $1.3 million for each of the years ended December 31, 2012 and 2011.

New Markets Tax Credit Transaction

On December 30, 2008, the Company entered into a transaction with USB related to the Cira South Garage in Philadelphia, Pennsylvania and expects to receive a net benefit of $7.8 million under a qualified New Markets Tax Credit Program (“NMTC”). The NMTC was provided for in the Community Renewal Tax Relief Act of 2000 (the “Act”) and is intended to induce investment capital in under-served and impoverished areas of the United States. The Act permits taxpayers (whether companies or individuals) to claim credits against their Federal income taxes for up to 39% of qualified investments in qualified, active low-income businesses or ventures.

USB contributed $13.3 million into the development of the Cira South Garage and as such it is entitled to substantially all of the benefits derived from the tax credit, but it does not have a material interest in the underlying economics of the Cira South Garage. This transaction also includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest. The Company believes the put will be exercised and an amount attributed to that obligation is included in other liabilities and is being accreted to the expected fixed put price. The said put price is insignificant.

Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide various other guarantees to USB, the Company concluded that the investment entities established to facilitate the NMTC transaction should be consolidated. The USB contribution of $13.3 million is included in deferred income on the Company’s consolidated balance sheets at each of the years ended December 31, 2013 and December 31, 2012. The USB contribution other than the amount allocated to the put obligation will be recognized as income in the consolidated financial statements when the tax benefits are delivered without risk of recapture to the tax credit investors and the Company’s obligation is relieved. The Company anticipates that it will recognize the net cash received as revenue within other income/expense in the year ended December 31, 2015. The NMTC is subject to 100% recapture for a period of seven years as provided in the Internal Revenue Code. The Company expects that the put/call provision will be exercised in 2017.

Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. The deferred cost at each of the years ended December 31, 2013 and December 31, 2012 is $5.3 million, and is included in other assets in the Company’s consolidated balance sheet.

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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,	$ (15,918)
Change during year	12,789	(7,338)	(4,499)
Settlement of interest rate swaps	0	(2,985)	0
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Balance at December 31,	(2,995)	(15,918)
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,	(15,918)	(6,079)	(1,945)
Change during year	12,789	(7,338)	(4,499)
Non-controlling interest- consolidated real estate venture partner's share of unrealized (gains)/losses on derivative financial instruments	(152)	187	212
Settlement of interest rate swaps		(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Balance at December 31,	(2,995)	(15,918)	(6,079)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,	(16,452)
Change during year	12,789	(7,338)	(4,499)
Settlement of interest rate swaps	0	(2,985)	0
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Balance at December 31,	(3,377)	(16,452)
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,	(16,452)	(6,426)	(2,080)
Change during year	12,789	(7,338)	(4,499)
Settlement of interest rate swaps		(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Balance at December 31,	$ (3,377)	$ (16,452)	$ (6,426)

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Parent Company	Cash Flow Hedges
Balance at January 1, 2011	$	(1,945	)
Change during year	(4,499		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	212
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,079	)
Change during year	(7,338		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	187
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(15,918	)
Change during year	12,789
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	(152		)
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(2,995	)

Operating Partnership	Cash Flow Hedges
Balance at January 1, 2011	$	(2,080	)
Change during year	(4,499		)
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,426	)
Change during year	(7,338		)
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(16,452	)
Change during year	12,789
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(3,377	)

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Schedule III - Real Estate and Accumulated Depreciation (Aggregate Costs for Federal Income Tax Purposes and Ownership Percentage) (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]
Real Estate, Federal Income Tax Basis	$ 4.0
3141 Fairview Park Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Equity Method Investment, Ownership Percentage	50.00%

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Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Consolidated debt obligations

. DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at December 31, 2013 and 2012 (in thousands):

Property / Location	December 31, 2013			December 31, 2012			Effective Interest Rate			Maturity Date
MORTGAGE DEBT:
Tysons Corner	$	91,395		$	93,188		5.36	%		Aug-15
One Commerce Square	125,089			—			3.68	%	(a)	Jan-16
Two Logan Square	88,583			89,340			7.57	%		Apr-16
Fairview Eleven Tower	21,630			22,000			4.25	%	(b)	Jan-17
Two Commerce Square	112,000			—			4.51	%	(a)	Apr-23
IRS Philadelphia Campus	190,964			197,111			7.00	%		Sep-30
Cira South Garage	40,101			42,303			7.12	%		Sep-30
Principal balance outstanding	669,762			443,942
Plus: fair market value premiums (discounts), net	389			(968		)
Total mortgage indebtedness	$	670,151		$	442,974
UNSECURED DEBT:
Credit Facility	—			69,000			LIBOR + 1.50%			Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			150,000			2.60	%		Feb-15
Four-Year Term Loan	100,000			100,000			LIBOR + 1.75%			Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			200,000			3.62	%		Feb-19
$250.0M 5.400% Guaranteed Notes due 2014	218,549			238,379			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	157,625			166,535			7.76	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	149,919			150,429			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.68	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.13	%		Apr-18
$250.0M 3.950% Guaranteed Notes due 2023	250,000			250,000			4.02	%		Feb-23
Indenture IA (Preferred Trust I)	27,062			27,062			2.75	%		Mar-35
Indenture IB (Preferred Trust I)	25,774			25,774			3.30	%		Apr-35
Indenture II (Preferred Trust II)	25,774			25,774			3.09	%		Jul-35
Principal balance outstanding	1,929,703			2,027,953
plus: original issue premium (discount), net	(4,473		)	(5,597		)
Total unsecured indebtedness	$	1,925,230		$	2,022,356
Total Debt Obligations	$	2,595,381		$	2,465,330

(a) This loan was assumed upon acquisition of the related properties on December 19, 2013. The interest rate reflects the market rate at the time of acquisition.

(b) Represents the full debt amount of a property in a consolidated joint venture for which the Company maintains a 50% interest.

Summary of debt repurchases

Notes	Principal		Repurchase Amount		Loss on Early Extinguishment of Debt			Acceleration of Deferred Financing Amortization
2014 5.400% Notes	$	19,830	$	20,822	$	(1,020	)	$	16
2015 7.500% Notes	8,910		9,902		(1,036		)	23
2016 6.000% Notes	510		572		(63		)	1
	$	29,250	$	31,296	$	(2,119	)	$	40

Schedule of principal payments of debt obligations

2014	$	232,375
2015	409,654
2016	467,705
2017	330,323
2018	336,954
Thereafter	822,454
Total principal payments	2,599,465
Net unamortized premiums/(discounts)	(4,084		)
Outstanding indebtedness	$	2,595,381

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 43,189	$ 6,529	$ (4,715)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	12,789	(7,338)	(4,499)
Settlement of interest rate swaps	0	(2,985)	0
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Total comprehensive income (loss)	13,075	(10,026)	(4,346)
Comprehensive income (loss)	56,264	(3,497)	(9,061)
Comprehensive (income) loss attributable to non-controlling interest	(564)	261	427
Comprehensive income (loss) attributable to Brandywine Realty Trust	55,700	(3,236)	(8,634)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)	43,189	6,529	(4,715)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	12,789	(7,338)	(4,499)
Settlement of interest rate swaps	0	(2,985)	0
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	286	297	153
Total comprehensive income (loss)	13,075	(10,026)	(4,346)
Comprehensive income (loss)	$ 56,264	$ (3,497)	$ (9,061)

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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended	12 Months Ended					12 Months Ended				0 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 15, 2014 Series E Preferred Stock [Member]	Dec. 31, 2013 Series E Preferred Stock [Member]	Dec. 31, 2013 Class A Units [Member]	Dec. 31, 2012 Class A Units [Member]	Dec. 31, 2011 Class A Units [Member]	Nov. 05, 2013 Offering Program [Member]	Dec. 31, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 10, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Jul. 15, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member]	Dec. 31, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member]	Dec. 31, 2013 General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2012 General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2011 General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									$ 38,982	$ (37,309)	$ (24,556)							$ 38,982	$ (37,309)	$ (24,556)
Income Loss From Continuing Operations Including Portion Attributable To Non controlling Interest Diluted									38,982	(37,309)	(24,556)							38,982	(37,309)	(24,556)
Amount allocated to unvested restricted shareholders									363	376	505							363	376	505
Amount allocated to unvested restricted shareholders, Diluted									363	376	505							363	376	505
Preferred share/unit dividends, Basic									(6,900)	(10,405)	(7,992)							(6,900)	(10,405)	(7,992)
Preferred share/unit dividends, Diluted									(6,900)	(10,405)	(7,992)							(6,900)	(10,405)	(7,992)
Preferred share/unit redemption premium, basic									0	(4,052)	0							0	(4,052)	0					(4,052)
Preferred share/unit redemption Premium, Diluted									0	(4,052)	0							0	(4,052)	0
Income Loss from continuing operations available to common shareholders Basic									31,362	(51,279)	(32,059)							31,719	(52,142)	(33,053)
Income Loss from continuing operations available to common shareholders Diluted									31,362	(51,279)	(32,059)							31,719	(52,142)	(33,053)
Discontinued operations attributable to common unitholders									4,207	43,838	19,841							4,207	43,838	19,841
Discontinued operations attributable to common unitholders, Diluted																		4,207	43,838	19,841
Net Income (Loss) Available to Common Stockholders, Basic									35,514	(8,238)	(12,996)							35,926	(8,304)	(13,212)
Net Income (Loss) Available to Common Stockholders, Diluted									35,514	(8,238)	(12,996)							35,926	(8,304)	(13,212)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									1,273,853	0	0							1,273,853	0	0
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic									$ 0.20	$ (0.36)	$ (0.24)							$ 0.20	$ (0.36)	$ (0.23)
Income (Loss) from Continuing Operations, Per Diluted Share									$ 0.20	$ (0.36)	$ (0.24)							$ 0.20	$ (0.36)	$ (0.23)
Discontinued operations attributable to common shareholders/unitholders, Basic									$ 0.03	$ 0.30	$ 0.14							$ 0.03	$ 0.30	$ 0.14
Discontinued operations attributable to common shareholders, Diluted									$ 0.03	$ 0.30	$ 0.14							$ 0.03	$ 0.30	$ 0.14
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)							$ 0.23	$ (0.06)	$ (0.09)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)							$ 0.23	$ (0.06)	$ (0.09)
Partners Equity of The Operating Partnership (Textuals) [Abstract]
Distribution Declared per common partnership unit																					$ 0.15
Dividends Payable, Amount	25,584				23,652				25,584	23,652								25,584	23,652		23,900
Percentage of Preferential return									6.90%				6.90%					6.90%		6.90%			6.90%
Preferred Stock, Liquidation Preference Per Share													$ 25.00										$ 25.00
Dividends, Preferred Stock, Cash									6,900	10,405	7,992	1,700										1,700		6,900	10,405	7,992
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price														$ 14.09	$ 12.19	$ 9.50
Limited Partners' Capital Account, Units Outstanding														1,763,739	1,845,737
Partners' Capital Account, Redemptions										$ (9,741)														$ (17)	$ 9,741
Weighted-average shares/units outstanding, Basic									153,140,458	143,257,097	135,444,424							154,929,545	145,883,217	145,118,841
Weighted-average shares/units outstanding, Diluted									154,414,311	143,257,097	135,444,424							156,203,398	145,883,217	145,118,841
Shares Authorized For Equity Offering Program																	16,000,000
Remaining Shares Available For Sales																	16,000,000

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Consolidated Statement of Partners' Equity (USD $) In Thousands, except Share data	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series D Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E Preferred Stock [Member]	Series E Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Total partners equity [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Beginning Balance at Dec. 31, 2010	$ 1,977,774		$ 47,912	$ 43	$ 55,538	$ 0	$ 1,743,549	$ (1,945)	$ (2,080)	$ 128,272	$ 0	$ 1,844,919
Beginning Balance, shares at Dec. 31, 2010			2,000,000	4,300,000	2,300,000	0	134,485,117
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(4,715)	(4,715)					(4,715)			(215)		(4,715)
Comprehensive income (loss)	(4,346)	(4,346)						(4,134)	(4,346)	(212)		(4,346)
Deferred Compensation Obligation Shares							(845)
Deferred Compensation Obligation							(16)					(16)
Issuance of LP Units							8,272					8,272
Issuance of LP Units Shares							679,285
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(377)									(32)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	6						6					6
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							463
Stock Issued During Period, Value, Conversion of Units	0						86,038			(86,038)		86,038
Stock Issued During Period, Shares, Conversion of Units							7,204,104
Share Choice Plan Issuance Value	(55)						(55)					(55)
Share Choice Plan Issuance Shares							1,684
Stock Issued During Period, Value, Restricted Stock Award, Gross	(350)						(352)					(352)
Stock Issued During Period, Shares, Restricted Stock Award, Gross							201,464
Restricted Stock Amortization	2,937						2,937					2,937
Restricted Performance Units Amortization	1,679						1,679					1,679
Outperformance Plan Amortization	123						123					123
Amortization of ESOP Award	1,487						1,487					1,487
Trustee Fees Paid in Shares							32					32
Trustee fees paid in shares units							2,672
Stock Issued During Period, Value, Stock Options Exercised	350						350					350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							120,179
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End							5,778					5,778
Dividends, Preferred Stock, Cash	(7,992)						(7,992)					(7,992)
Preferred share/unit redemption charge	0	0
Partners' Capital Account, Distributions							(82,819)					(82,819)
Ending Balance at Dec. 31, 2011	1,889,696		47,912	43	55,538	0	1,754,302	(6,079)	(6,426)	33,105	0	1,851,326
Ending Balance, shares at Dec. 31, 2011			2,000,000	4,300,000	2,300,000	0	142,690,755
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6,529	6,529					6,529			(66)		6,529
Comprehensive income (loss)	(10,026)	(10,026)						(9,839)	(10,026)	(187)		(10,026)
Deferred Compensation Obligation Shares							(5,564)
Deferred Compensation Obligation							0					0
Preferred Stock, Value, Issued	40	96,850				96,850						96,850
Preferred Stock, Shares Issued	4,000,000	4,000,000				4,000,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(613)						(613)					(613)
Redemption of preferred shares, Value	103,448		(47,912)	43	(55,538)							(103,450)
Redemption of preferred shares, Shares			(2,000,000)	(4,300,000)	(2,300,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	387						387					387
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							35,703
Stock Issued During Period, Value, Conversion of Units	(167)						(49)			(268)		(49)
Stock Issued During Period, Shares, Conversion of Units							20,464
Partners' Capital Account, Redemptions	9,741						(9,741)			5,556		(9,741)
Stock Issued During Period, Value, Restricted Stock Award, Gross	(1,385)						(1,385)					(1,385)
Stock Issued During Period, Shares, Restricted Stock Award, Gross							293,614
Restricted Stock Amortization	3,271						3,271					3,271
Restricted Stock Award, Forfeitures	(35)						35					35
Stock Issued During Period, Value, Vesting of restricted performance units	(1,495)						(1,495)					(1,495)
Stock Issued During Period, Shares, Vesting of restricted performance units							272,131
Restricted Performance Units Amortization	3,379						3,379					3,379
Amortization of ESOP Award	1,636						1,636					1,636
Trustee Fees Paid in Shares							15					15
Trustee fees paid in shares units							1,336
Stock Issued During Period, Value, Stock Options Exercised	976						976					976
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							230,294
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End							9,968					9,968
Dividends, Preferred Stock, Cash	(10,405)						(10,405)					(10,405)
Preferred share/unit redemption charge	(4,052)	(4,052)					(4,052)					(4,052)
Partners' Capital Account, Distributions							(86,417)					(86,417)
Ending Balance at Dec. 31, 2012	1,773,516	1,746,739	0	40	0	96,850	1,666,341	(15,918)	(16,452)	21,238		1,746,739
Ending Balance, shares at Dec. 31, 2012			0	4,000,000	0	4,000,000	143,538,733
Beginning Balance at Sep. 30, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(26,698)
Preferred Stock, Value, Issued	40					96,850
Preferred Stock, Shares Issued	4,000,000					4,000,000
Ending Balance at Dec. 31, 2012	1,773,516	1,746,739				96,850	1,666,341	(15,918)	(16,452)	21,238	0	1,746,739
Ending Balance, shares at Dec. 31, 2012						4,000,000	143,538,733
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	43,189	43,189					43,189			412		43,189
Comprehensive income (loss)	13,075	13,075						12,923	13,075	152		13,075
Deferred Compensation Obligation Shares							(5,012)
Deferred Compensation Obligation							0					0
Issuance of LP Units							181,289					181,289
Issuance of LP Units Shares							12,650,000
Preferred Stock, Value, Issued	40	96,850
Preferred Stock, Shares Issued	4,000,000	4,000,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(744)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	946									946	(946)	(946)
Redemption of preferred shares, Value												361
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	361						361					(902)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							27,918
Stock Issued During Period, Value, Conversion of Units	0						1,240			(1,240)		1,240
Stock Issued During Period, Shares, Conversion of Units							81,998
Partners' Capital Account, Redemptions							17					17
Share Choice Plan Issuance Value							(160)					(160)
Share Choice Plan Issuance Shares							53,134
Stock Issued During Period, Value, Restricted Stock Award, Gross	(902)
Restricted Stock Amortization	3,079						3,079					3,079
Stock Issued During Period, Value, Vesting of restricted performance units	(159)						(902)
Stock Issued During Period, Shares, Vesting of restricted performance units							147,495
Restricted Performance Units Amortization	4,333						4,333					4,333
Amortization of ESOP Award	670						670					670
Trustee Fees Paid in Shares							20					20
Trustee fees paid in shares units							1,409
Stock Issued During Period, Value, Stock Options Exercised	2,380						2,380					2,380
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	236,318						236,318
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End							(778)					(778)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock							(1,240)					(1,240)
Dividends, Preferred Stock, Cash	(6,900)						(6,900)					6,900
Preferred share/unit redemption charge	0	0
Partners' Capital Account, Distributions							(92,409)					92,409
Ending Balance at Dec. 31, 2013	$ 1,921,435	$ 1,894,949	$ 0	$ 40	$ 0	$ 96,850	$ 1,800,530	$ (2,995)	$ (3,377)	$ 21,215	$ 946	$ 1,894,949
Ending Balance, shares at Dec. 31, 2013			0	4,000,000	0	4,000,000	156,731,993

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Summary of Significant Accounting Policies Construction in Progress (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Construction in Progress [Line Items]
Internal direct construction costs capitalized related to development of properties and land holdings	$ 3,700,000	$ 4,700,000	$ 4,000,000
Interest Costs Capitalized	2,600,000	2,600,000	2,000,000
Salaries including bonuses and benefits, capitalized during the period	3,673,000	4,669,000	4,034,000
Development [Member]
Construction in Progress [Line Items]
Salaries including bonuses and benefits, capitalized during the period	156,000	57,000	0
Redevelopment [Member]
Construction in Progress [Line Items]
Salaries including bonuses and benefits, capitalized during the period	194,000	353,000	0
Tenant Improvements [Member]
Construction in Progress [Line Items]
Salaries including bonuses and benefits, capitalized during the period	$ 3,323,000	$ 4,259,000	$ 4,034,000

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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Long Term Debt Maturities Repayments Of Principal	$ 2,599,465
Derivative, Gain (Loss) on Derivative, Net	0	(2,985)	0
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	51,548	51,548
Fair value	767	(2,391)
Other Assets [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.300% Interest Rate Swap Maturing January 30, 2021 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	25,774	25,774
Derivative, Fixed Interest Rate	3.30%
Fair value	549	(1,262)
Other Assets [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.090% Interest Rate Swap Maturing October 30, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	25,774	25,774
Derivative, Fixed Interest Rate	3.09%
Fair value	218	(1,129)
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	377,062	377,062
Fair value	(2,188)	(11,819)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.623% Interest Rate Swap Maturing February 1, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	200,000	200,000
Derivative, Fixed Interest Rate	3.623%
Fair value	(545)	(8,859)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.703% Interest Rate Swap Maturing February 1, 2016 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	77,000	77,000
Derivative, Fixed Interest Rate	2.703%
Fair value	(887)	(1,343)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.470% Interest Rate Swap Maturing February 1, 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	50,000	50,000
Derivative, Fixed Interest Rate	2.47%
Fair value	(283)	(458)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.513% Interest Rate Swap Maturing May 1, 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	23,000	23,000
Derivative, Fixed Interest Rate	2.513%
Fair value	(162)	(245)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.750% Interest Rate Swap Maturing September 30, 2017 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	27,062	27,062
Derivative, Fixed Interest Rate	2.75%
Fair value	$ (311)	$ (914)

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Investment in Unconsolidated Ventures Company's Investment in Real Estate Ventures and the Company's Share of the Real Estate Ventures' Income (Loss) (Details) (USD $)	12 Months Ended								12 Months Ended						12 Months Ended																					12 Months Ended																											12 Months Ended
	Dec. 31, 2013 acre	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Broadmoor Austin Associates [Member]		Dec. 31, 2013 HSRE, LLC [Member] [Member]	Dec. 31, 2013 4040 Wilson Venture [Member]	Jul. 31, 2013 4040 Wilson Venture [Member] acre	Dec. 31, 2013 Brandywine - Al Venture [Member]		Dec. 31, 2013 Austin Joint Venture [Member]		Dec. 31, 2013 BDN Beacon Venture LLC [Member]	Mar. 26, 2013 BDN Beacon Venture LLC [Member]	Dec. 31, 2013 TB-BDN Plymouth Apartments [Member]	Dec. 31, 2013 Six Tower Bridge [Member]		Dec. 31, 2013 One Commerce Square [Member]		Dec. 31, 2013 Two Commerce Square [Member]		Dec. 31, 2013 Brandywine Nineteen Nineteen Ventures [Member]	Dec. 31, 2013 One Thousand Chesterbrook Blvd. [Member]	Dec. 31, 2013 Four Tower Bridge [Member]	Dec. 31, 2013 Residence Inn Tower Bridge [Member]	Dec. 31, 2013 PJP VII [Member]	Dec. 31, 2013 PJP Two [Member]	Dec. 31, 2013 G&I Interchange Office LLC (DRA — N. PA) [Member] Rate		Dec. 31, 2013 Seven Tower Bridge [Member]		Dec. 31, 2013 PJP Five [Member]	Dec. 31, 2013 Two Tower Bridge [Member]		Jun. 19, 2013 Two Tower Bridge [Member]	Dec. 31, 2013 PJP Six [Member]	Dec. 31, 2013 Coppell Associates [Member]	Dec. 31, 2013 Eight Tower Bridge [Member]	Dec. 31, 2013 Invesco, L.P. [Member]	Dec. 31, 2013 Secured Debt [Member]	Dec. 31, 2012 Secured Debt [Member]	Dec. 31, 2011 Secured Debt [Member]	Dec. 31, 2013 Secured Debt [Member] Brandywine - Al Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Austin Joint Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Seven Tower Bridge [Member]		Dec. 31, 2013 Secured Debt [Member] Fixed rate loan maturing January 2019 [Member] Brandywine - Al Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Fixed rate loan maturing January 2022 [Member] Brandywine - Al Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Fixed rate loan maturing August 2019 [Member] Brandywine - Al Venture [Member]		Dec. 31, 2013 Secured Debt [Member] First mortgage - swapped to fixed [Member] Austin Joint Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Second mortgage - swapped to fixed [Member] Austin Joint Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Third mortgage - swapped to fixed [Member] Austin Joint Venture [Member]		Dec. 31, 2013 Secured Debt [Member] Mortgage Maturing February 2015 [Domain] Brandywine - Al Venture [Member] Fixed_Rate_Mortgages		Dec. 31, 2013 Secured Debt [Member] Mortgage Maturing February 2015 [Domain] Seven Tower Bridge [Member] Fixed_Rate_Mortgages		Dec. 31, 2013 Secured Debt [Member] Fixed Rate Loan Maturing September 2025 [Member] Seven Tower Bridge [Member]		Dec. 31, 2013 Secured Debt [Member] Fixed Rate Loan Maturing February 2014 [Member] Seven Tower Bridge [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Face Amount																																																	$ 40,000,000	[1]	$ 28,000,000	[2]	$ 66,500,000	[1]	$ 34,000,000	[3]	$ 56,000,000	[3]	$ 140,600,000	[3]
Long-term Debt, Weighted Average Interest Rate																																								5.73%	6.65%	6.72%	3.92%	[1]	3.39%	[3]	4.22%	[4]
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land	3.8							1.3
Equity Method Investment, Ownership Percentage				50.00%	[5]	30.00%	50.00%	50.00%	50.00%		50.00%		20.00%	20.00%	50.00%	63.00%	[2]	25.00%	[4]	25.00%	[6]	50.00%	50.00%	65.00%	50.00%	25.00%	30.00%	20.00%	[4],[5]	20.00%		25.00%	35.00%	[7]		25.00%	50.00%
Equity Method Investments	180,512,000	193,555,000	115,807,000	65,867,000		13,761,000	13,499,000		46,406,000		17,262,000		0	17,000,000	12,402,000	0		0		0		6,214,000	2,064,000	1,617,000	742,000	783,000	330,000	0		447,000		175,000	0		(100,000)	112,000	(1,169,000)	0	0
Income (Loss) from Equity Method Investments	3,664,000	2,741,000	3,775,000	(52,000)		0	0		130,000		(434,000)		907,000		5,000	165,000		933,000		614,000		0	461,000	320,000	326,000	239,000	(87,000)	(619,000)		0		158,000	265,000			70,000	(78,000)	3,000	338,000
Equity Method Investment Summarized Financial Information Debt	699,860,000			56,616,000		966,000	0		134,500,000		230,600,000		0		0	0		0		0		0	24,861,000	10,535,000	13,700,000	6,250,000	3,765,000	177,207,000		11,035,000		5,437,000	0			8,404,000	15,984,000																										8,000,000	[4]	1,000,000	[4]	2,000,000	[4]
Debt Instrument, Interest Rate Terms						L+2.20%									L+1.70%											L+2.65%
Debt Instrument, Interest Rate, Effective Percentage				7.04%					3.92%		3.39%												4.75%	5.20%	5.63%		6.12%	5.78%		4.22%		6.47%				6.08%	5.75%
Debt Instrument Maturity Dates				Apr-23		Jul-16			(b)	[1]	(c)	[3]			Dec-17								Dec-21	Feb-21	Feb-16	Dec-19	Nov-23	Jan-15		(d)	[8]	Aug-19				Apr-23	Feb-16
Sale of ownership in properties																												80.00%	[4]
Debt Instrument, Number of Fixed Rate Mortgages																																																													3	[4]	2	[4]
Debt Instrument, Interest Rate, Stated Percentage																																																	4.40%	[1]	4.65%	[1]	3.22%	[1]	3.52%	[3]	3.19%	[3]	3.44%	[3]			6.00%	[4]	3.00%	[4]	4.00%	[4]
Debt Instrument, Interest Rate Increase																																																															1.00%	[4]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 7,496,000	$ 5,109,000	$ 10,316,000

[1] (b)The debt for these properties is comprised of three fixed rate mortgages: (1) $40.0 million with a 4.40% fixed interest rate due January 1, 2019, (2) $28.0 million with a 4.65% fixed interest rate due January 1, 2022, and (3) $66.5 million with a 3.22% fixed interest rate due August 1, 2019, resulting in a time and dollar weighted average rate of 3.92%.

[2] (g)On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.

[3] (c)The debt for these properties is comprised of three mortgages: (1) $34.0 million with a 3.52% interest rate due November 1, 2018, (2) $56.0 million with a 3.19% interest rate due October 15, 2018, and (3) $140.6 million with a rate of 3.44% fixed interest rate due November 1, 2018, resulting in a time and dollar weighted average rate of 3.39%.

[4] (e)Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. No investment in the real estate venture was reflected on the balance sheet at formation.

[5] (f)The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).

[6] (h)On December 19, 2013, we increased our ownership interest in One and Two Commerce Square. The real estate venture income reflects our previous partnership interest for the year to date period through December 18, 2013.

[7] (i)The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.

[8] (d)Comprised of two fixed rate mortgages totaling $8.0 million that mature on February 8, 2015 and accrue interest at a current rate of 6% (increasing by 1% annually through maturity), a $1.0 million 3% fixed rate loan with interest only through its September 1, 2025 maturity, and a $2.0 million 4% fixed rate loan with interest only through its February 7, 2016 maturity, resulting in a time and dollar weighted average rate of 4.22%.

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Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive Income (Loss) Note [Text Block]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table details the components of accumulated other comprehensive income (loss) of the Parent Company and the Operating Partnership as of and for the three years ended December 31, 2013 (in thousands):

Parent Company	Cash Flow Hedges
Balance at January 1, 2011	$	(1,945	)
Change during year	(4,499		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	212
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,079	)
Change during year	(7,338		)
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	187
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(15,918	)
Change during year	12,789
Non-controlling interest — consolidated real estate venture partner’s share of unrealized (gains)/losses on derivative financial instruments	(152		)
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(2,995	)

Operating Partnership	Cash Flow Hedges
Balance at January 1, 2011	$	(2,080	)
Change during year	(4,499		)
Reclassification adjustments for (gains) losses reclassified into operations	153
Balance at December 31, 2011	$	(6,426	)
Change during year	(7,338		)
Settlement of interest rate swaps	(2,985		)
Reclassification adjustments for (gains) losses reclassified into operations	297
Balance at December 31, 2012	$	(16,452	)
Change during year	12,789
Reclassification adjustments for (gains) losses reclassified into operations	286
Balance at December 31, 2013	$	(3,377	)

Over time, the unrealized gains and losses held in Accumulated Other Comprehensive Income (“AOCI”) will be reclassified to interest expense when the related hedged items are recognized in earnings. The current balance held in AOCI is expected to be reclassified to interest expense for realized losses on forecasted debt transactions over the related term of the debt obligation, as applicable.

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Intangible Assets (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Annual amortization of intangible assets and liabilities
Intangible Assets, net	$ 132,329,000	$ 70,620,000
Assets [Member]
Annual amortization of intangible assets and liabilities
2014	27,043,000
2015	23,314,000
2016	18,573,000
2017	16,573,000
2018	12,161,000
Thereafter	34,665,000
Intangible Assets, net	132,329,000
Liabilities [Member]
Annual amortization of intangible assets and liabilities
2014	7,614,000
2015	5,455,000
2016	3,486,000
2017	2,890,000
2018	2,353,000
Thereafter	12,646,000
Intangible Assets, net	34,444,000
Tenant Move-Outs Prior to End of the Lease Term [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Written Off Through Accelerated Amortization	1,600,000	1,400,000	7,400,000
Intangible Liabilities Written Off Through Accelerated Amortization			$ 200,000

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Investment in Unconsolidated Ventures (Tables)

12 Months Ended

Dec. 31, 2013

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments [Table Text Block]

The Company’s investment in Real Estate Ventures as of December 31, 2013 and the Company’s share of the Real Estate Ventures’ income (loss) for the year ended December 31, 2013 was as follows (in thousands):

	Ownership Percentage (a)		Carrying Amount			Company’s Share of 2013 Real Estate Venture Income (Loss)			Real Estate Venture Debt at 100%		Current Interest Rate		Debt Maturity
Broadmoor Austin Associates (f)	50	%	$	65,867		$	(52	)	$	56,616	7.04	%	Apr-23
Brandywine-AI Venture LLC	50	%	46,406			130			134,500		3.92	%	(b)
DRA (G&I) Austin (f)	50	%	17,262			(434		)	230,600		3.39	%	(c)
HSRE-Campus Crest IX, LLC (f)	30	%	13,761			—			966		L+2.20%		Jul-16
4040 Wilson LLC	50	%	13,499			—			—		N/A		N/A
TB-BDN Plymouth Apartments	50	%	12,402			5			—		L+1.70%		Dec-17
Brandywine 1919 Ventures	50	%	6,214			—			—		N/A		N/A
1000 Chesterbrook Blvd.	50	%	2,064			461			24,861		4.75	%	Dec-21
Four Tower Bridge	65	%	1,617			320			10,535		5.20	%	Feb-21
PJP VII	25	%	783			239			6,250		L+2.65%		Dec-19
Residence Inn Tower Bridge	50	%	742			326			13,700		5.63	%	Feb-16
Seven Tower Bridge	20	%	447			—			11,035		4.22	%	(d)
PJP II	30	%	330			(87		)	3,765		6.12	%	Nov-23
PJP V	25	%	175			158			5,437		6.47	%	Aug-19
PJP VI	25	%	112			70			8,404		6.08	%	Apr-23
BDN Beacon Venture LLC (i)	20	%	—			907			—		N/A		N/A
Six Tower Bridge (g)	63	%	—			165			—		N/A		N/A
One Commerce Square (h)	25	%	—			933			—		N/A		N/A
Two Commerce Square (h)	25	%	—			614			—		N/A		N/A
G&I Interchange Office LLC (DRA — N. PA) (e) (f)	20	%	—			(619		)	177,207		5.78	%	Jan-15
Two Tower Bridge (i)	35	%	—			265			—		N/A		N/A
Coppell Associates	50	%	(1,169		)	(78		)	15,984		5.75	%	Feb-16
Eight Tower Bridge (i)			—			3			—
Invesco, L.P. (i)			—			338			—
			$	180,512		$	3,664		$	699,860

(a) Ownership percentage represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

(b) The debt for these properties is comprised of three fixed rate mortgages: (1) $40.0 million with a 4.40% fixed interest rate due January 1, 2019, (2) $28.0 million with a 4.65% fixed interest rate due January 1, 2022, and (3) $66.5 million with a 3.22% fixed interest rate due August 1, 2019, resulting in a time and dollar weighted average rate of 3.92%.

(c) The debt for these properties is comprised of three mortgages: (1) $34.0 million with a 3.52% interest rate due November 1, 2018, (2) $56.0 million with a 3.19% interest rate due October 15, 2018, and (3) $140.6 million with a rate of 3.44% fixed interest rate due November 1, 2018, resulting in a time and dollar weighted average rate of 3.39%.

(d) Comprised of two fixed rate mortgages totaling $8.0 million that mature on February 8, 2015 and accrue interest at a current rate of 6% (increasing by 1% annually through maturity), a $1.0 million3% fixed rate loan with interest only through its September 1, 2025 maturity, and a $2.0 million4% fixed rate loan with interest only through its February 7, 2016 maturity, resulting in a time and dollar weighted average rate of 4.22%.

(e) Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. No investment in the real estate venture was reflected on the balance sheet at formation.

(f) The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).

(g) On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.

(h) On December 19, 2013, we increased our ownership interest in One and Two Commerce Square. The real estate venture income reflects our previous partnership interest for the year to date period through December 18, 2013.

(i) The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.

Financial position of unconsolidated Real Estate Ventures

	December 31, 2013		December 31, 2012
Net property	$	965,475	$	923,536
Other assets	164,152		174,677
Other liabilities	49,442		53,645
Debt	699,860		724,780
Equity	380,325		319,788
Company’s share of equity (Company’s basis)	180,512		193,555

Summary of results of operations of unconsolidated Real Estate Ventures

The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests as of December 31, 2013, 2012 and 2011 (in thousands):

	Years ended December 31,
	2013		2012		2011
Revenue	$	102,919	$	164,013	$	145,867
Operating expenses	40,436		70,775		63,715
Interest expense, net	26,529		41,633		42,032
Depreciation and amortization	35,138		50,241		39,172
Net income	816		1,364		948
Company’s share of income (Company’s basis)	3,664		2,741		3,775

Schedule of Maturities of Long-term Debt [Table Text Block]

As of December 31, 2013, the aggregate principal payments of recourse and non-recourse debt payable to third-parties are as follows (in thousands):

2014	$	11,940
2015	191,304
2016	42,180
2017	13,937
2018	229,780
Thereafter	210,719
	$	699,860

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Discontinued Operations

12 Months Ended

Dec. 31, 2013

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS

For the years ended December 31, 2013, 2012 and 2011, income from discontinued operations relates to an aggregate of 32 properties containing approximately 2.3 million net rentable square feet that the Company has sold since January 1, 2011.

The following table summarizes revenue and expense information for the properties sold which qualify for discontinued operations reporting since January 1, 2011 (in thousands):

	Years ended December 31,
	2013		2012		2011
Revenue:
Rents	$	4,754	$	28,678	$	43,050
Tenant reimbursements	355		2,353		5,030
Termination fees	—		11		75
Other	123		378		110
Total revenue	5,232		31,420		48,265
Expenses:
Property operating expenses	1,839		8,687		13,940
Real estate taxes	649		3,468		5,356
Depreciation and amortization	1,921		10,208		16,178
Total operating expenses	4,409		22,363		35,474
Other income:
Interest income	2		7		3
Income from discontinued operations before gain on sale of interests in real estate	825		9,064		12,794
Net gain on disposition of discontinued operations	3,382		34,774		7,047
Income from discontinued operations	$	4,207	$	43,838	$	19,841

Discontinued operations have not been segregated in the consolidated statements of cash flows. Therefore, amounts for certain captions will not agree with respective data in the consolidated statements of operations.

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Summary of Quarterly Results (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information [Line Items]
Real Estate Revenue, Net	$ 138,658,000	$ 143,354,000	$ 140,644,000	$ 139,554,000	$ 136,395,000	$ 134,238,000	$ 131,530,000	$ 133,516,000	$ 562,210,000	$ 535,679,000	$ 538,568,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	21,002,000	11,088,000	7,180,000	3,919,000	(26,698,000)	17,089,000	6,802,000	9,336,000	43,189,000	6,529,000	(4,715,000)
Net Income (Loss) Attributable to Parent	18,975,000	9,173,000	5,308,000	2,058,000	(30,832,000)	13,949,000	1,537,000	7,108,000	42,777,000	6,595,000	(4,499,000)
Earnings Per Share, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Earnings Per Share, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Restatement Adjustment [Member]
Quarterly Financial Information [Line Items]
Out of period stock compensation expense adjustment					600,000
Overstatement (Understatement) of Expense due to Out of Period Adjustment					$ 600,000	$ (200,000)	$ (300,000)				$ (100,000)