10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_________________________

FORM 10-Q

_________________________

(Mark One)

þ	Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the quarterly period ended June 30, 2012

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	(I.R.S. Employer
Incorporation or organization)	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

_________________________

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

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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

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.

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

A total of 143,408,964 Common Shares of Beneficial Interest, par value $0.01 per share of Brandywine Realty Trust, were outstanding as of July 27, 2012.

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EXPLANATORY NOTE

This report combines the quarterly reports on Form 10-Q for the period ended June 30, 2012 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 June 30, 2012, owned a 98.2% interest in the Operating Partnership. The remaining 1.8% 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.

The Company believes that combining the quarterly reports on Form 10-Q 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.

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.

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;

• Parent Company’s and Operating Partnership’s Equity; and

• Liquidity and Capital Resources in the Management’s Discussion and Analysis of Financial Condition and Results of Operations.

This report also includes separate Item 4. (Controls and Procedures) disclosures and separate Exhibit 31 and 32 certifications for

3

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. Although the Operating Partnership is generally the entity that directly or indirectly enters into contracts and real estate ventures and holds assets and debt, reference to the Company is appropriate because the business is one enterprise and the Parent Company operates the business through the Operating Partnership.

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.

4

TABLE OF CONTENTS

	Page
PART I — FINANCIAL INFORMATION
Item 1. Brandywine Realty Trust
Financial Statements of Brandywine Realty Trust (unaudited)
Consolidated Balance Sheets as of June 30, 2012 and December 31, 2011	6
Consolidated Statements of Operations for the three and six- month periods ended June 30, 2012 and 2011	7
Consolidated Statements of Comprehensive Income for the three and six- month periods ended June 30, 2012 and 2011	8
Consolidated Statements of Equity for the six month periods ended June 30, 2012 and 2011	9
Consolidated Statements of Cash Flows for the six-month periods ended June 30, 2012 and 2011	11
Brandywine Operating Partnership, L.P.
Financial Statements of Brandywine Operating Partnership, L.P. (unaudited)
Consolidated Balance Sheets as of June 30, 2012 and December 31, 2011	12
Consolidated Statements of Operations for the three and six- month periods ended June 30, 2012 and 2011	13
Consolidated Statements of Comprehensive Income for the three and six- month periods ended June 30, 2012 and 2011	14
Consolidated Statements of Cash Flows for the six-month periods ended June 30, 2012 and 2011	15
Notes to Unaudited Consolidated Financial Statements	16
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	46
Item 3. Quantitative and Qualitative Disclosures about Market Risk	66
Item 4. Controls and Procedures	66
PART II — OTHER INFORMATION
Item 1. Legal Proceedings	67
Item 1A. Risk Factors	67
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	67
Item 3. Defaults Upon Senior Securities	67
Item 4. Mine Safety Disclosures	67
Item 5. Other Information	67
Item 6. Exhibits	68
Signatures	69
Exhibit 3.1
Exhibit 3.2
Exhibit 4.1
Exhibit 4.2
Exhibit 31.1
Exhibit 31.2
Exhibit 31.3
Exhibit 31.4
Exhibit 32.1
Exhibit 32.2
Exhibit 32.3
Exhibit 32.4
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

Filing Format

This combined Form 10-Q is being filed separately by Brandywine Realty Trust and Brandywine Operating Partnership, L.P.

5

PART I — FINANCIAL INFORMATION

Item 1. — Financial Statements

BRANDYWINE REALTY TRUST

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share information)

	June 30, 2012			December 31, 2011
	(unaudited)
ASSETS
Real estate investments:
Rental properties	$	4,639,047		$	4,793,080
Accumulated depreciation	(897,367		)	(865,710		)
Operating real estate investments, net	3,741,680			3,927,370
Construction-in-progress	57,420			25,083
Land inventory	109,564			109,008
Total real estate investments, net	3,908,664			4,061,461
Cash and cash equivalents	190,055			410
Available-for-sale securities	42,072			—
Accounts receivable, net	11,445			14,718
Accrued rent receivable, net	113,380			108,101
Assets held for sale, net	41,450			—
Investment in real estate ventures, at equity	133,292			115,807
Deferred costs, net	114,920			115,362
Intangible assets, net	57,927			70,515
Notes receivable	7,226			18,186
Other assets	48,739			53,158
Total assets	$	4,669,170		$	4,557,718
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	$	505,214		$	511,061
Unsecured credit facility	—			275,500
Unsecured term loans	600,000			37,500
Unsecured senior notes, net of discounts	1,404,627			1,569,934
Accounts payable and accrued expenses	57,653			69,929
Distributions payable	24,889			23,895
Deferred income, gains and rent	95,390			99,569
Acquired lease intangibles, net	31,526			35,106
Other liabilities	55,264			45,528
Liabilities related to assets held for sale	878			—
Total liabilities	2,775,441			2,668,022
Commitments and contingencies (Note 17)
Brandywine Realty Trust’s equity:
Preferred Shares (shares authorized-20,000,000):
7.50% Series C Preferred Shares, $0.01 par value; issued and outstanding- 0 in 2012 and 2,000,000 in 2011	—			20
7.375% Series D Preferred Shares, $0.01 par value; issued and outstanding- 2,300,000 in 2012 and 2011, respectively	23			23
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2012 and 0 in 2011	40			—
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 200,000,000; 143,367,946 and 142,690,755 issued in 2012 and 2011, respectively and 143,367,946 and 142,690,755 outstanding in 2012 and 2011, respectively	1,431			1,424
Additional paid-in capital	2,826,475			2,776,197
Deferred compensation payable in common shares	5,436			5,631
Common shares in grantor trust, 293,122 in 2012 and 292,646 in 2011	(5,436		)	(5,631		)
Cumulative earnings	493,266			477,338
Accumulated other comprehensive loss	(16,449		)	(6,079		)
Cumulative distributions	(1,442,662		)	(1,392,332		)
Total Brandywine Realty Trust’s equity	1,862,124			1,856,591
Non-controlling interests	31,605			33,105
Total equity	1,893,729			1,889,696
Total liabilities and equity	$	4,669,170		$	4,557,718

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

6

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited, in thousands, except share and per share information)

	For the three-month periods ended						For the six-month periods ended
	June 30,						June 30,
	2012			2011			2012			2011
Revenue:
Rents	$	115,032		$	114,995		$	229,271		$	230,328
Tenant reimbursements	18,605			18,237			37,613			40,177
Termination fees	101			1,948			1,591			2,516
Third party management fees, labor reimbursement and leasing	2,872			2,733			6,014			5,486
Other	966			1,336			2,498			2,359
Total revenue	137,576			139,249			276,987			280,866
Operating Expenses:
Property operating expenses	37,906			39,115			77,363			83,235
Real estate taxes	14,134			13,786			28,228			27,495
Third party management expenses	1,264			1,506			2,514			3,016
Depreciation and amortization	49,331			55,710			98,880			105,214
General and administrative expenses	6,079			5,890			12,129			12,134
Total operating expenses	108,714			116,007			219,114			231,094
Operating income	28,862			23,242			57,873			49,772
Other Income (Expense):
Interest income	1,841			421			2,324			862
Interest expense	(32,981		)	(34,738		)	(67,125		)	(67,131		)
Interest expense — amortization of deferred financing costs	(1,261		)	(1,070		)	(2,572		)	(1,998		)
Interest expense — financing obligation	(196		)	—			(378		)	—
Equity in income of real estate ventures	838			1,088			882			2,321
Net gain on sale of interests in real estate	—			—			—			2,791
Loss on early extinguishment of debt	(1,250		)	(756		)	(1,498		)	(756		)
Loss from continuing operations	(4,147		)	(11,813		)	(10,494		)	(14,139		)
Discontinued operations:
Income from discontinued operations	783			1,743			1,798			3,579
Net gain on disposition of discontinued operations	10,166			3,836			24,834			3,836
Total discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	6,802			(6,234		)	16,138			(6,724		)
Net (income) loss from discontinued operations attributable to non-controlling interests — LP units	(200		)	(111		)	(487		)	(148		)
Net (income) loss attributable to non-controlling interests — LP units	169			276			322			364
Net (income) loss attributable to non-controlling interests	(31		)	165			(165		)	216
Net income (loss) attributable to Brandywine Realty Trust	6,771			(6,069		)	15,973			(6,508		)
Distribution to Preferred Shares	(3,049		)	(1,998		)	(5,047		)	(3,996		)
Preferred share redemption charge	(2,090		)	—			(2,090		)	—
Amount allocated to unvested restricted shareholders	(95		)	(121		)	(191		)	(263		)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$	1,537		$	(8,188	)	$	8,645		$	(10,767	)
Basic income (loss) per Common Share:
Continuing operations	$	(0.07	)	$	(0.10	)	$	(0.12	)	$	(0.13	)
Discontinued operations	0.08			0.04			0.18			0.05
	$	0.01		$	(0.06	)	$	0.06		$	(0.08	)
Diluted income (loss) per Common Share:
Continuing operations	$	(0.07	)	$	(0.10	)	$	(0.12	)	$	(0.13	)
Discontinued operations	0.08			0.04			0.18			0.05
	$	0.01		$	(0.06	)	$	0.06		$	(0.08	)
Basic weighted average shares outstanding	143,300,637			135,342,538			143,060,796			134,962,093
Diluted weighted average shares outstanding	143,300,637			135,342,538			143,060,796			134,962,093
Net income (loss) attributable to Brandywine Realty Trust
Loss from continuing operations	$	(3,978	)	$	(11,537	)	$	(10,172	)	$	(13,775	)
Income from discontinued operations	10,749			5,468			26,145			7,267
Net income (loss)	$	6,771		$	(6,069	)	$	15,973		$	(6,508	)

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

7

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited, in thousands)

	For the three-month periods ended						For the six-month periods ended
	June 30,						June 30,
	2012			2011			2012			2011
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)
Comprehensive income (loss):
Unrealized loss on derivative financial instruments	(10,650		)	—			(10,623		)	(613		)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76			51			124			74
Unrealized loss on available-for-sale securities	(65		)	—			(65		)	—
Total comprehensive income (loss)	(10,639		)	51			(10,564		)	(539		)
Comprehensive income (loss)	(3,837		)	(6,183		)	5,574			(7,263		)
Comprehensive (income) loss attributable to non-controlling interest	163			164			29			226
Comprehensive income (loss) attributable to Brandywine Realty Trust	$	(3,674	)	$	(6,019	)	$	5,603		$	(7,037	)

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

8

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY

For the Six -Month Periods Ended June 30, 2012 and 2011

(unaudited, in thousands, except number of shares)

June 30, 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																								15,973									165			16,138
Comprehensive loss																											(10,370		)				(194		)	(10,564		)
Issuance of Preferred Shares	4,000,000		40										96,810																							96,850
Preferred Share Issuance Costs													(610		)																					(610		)
Redemption of Preferred Shares	(2,000,000	)	(20		)								(47,890		)																					(47,910		)
Conversion of LP Units to Common Shares						20,464					—		149											(45		)							(332		)	(228		)
Bonus Share Issuance						35,703							387																							387
Vesting of Restricted Shares						280,851			9,036		3		(1,295		)																					(1,292		)
Restricted Share Amortization													1,426																							1,426
Vesting of Restricted Performance Units						249,797					3		(1,332		)																					(1,329		)
Restricted Performance Units Amortization													1,205																							1,205
Exercise of Share Options						94,429					1		274																							275
Share Option Amortization													747																							747
Share Issuance from/to Deferred Compensation Plan						(5,389	)		(8,560	)								(195		)	195															—
Trustee Fees Paid in Shares						1,336					—		15																							15
Adjustment to Non-controlling Interest													392																				(379		)	13
Preferred Share distributions																														(5,047		)				(5,047		)
Preferred Share redemption charges																														(2,090		)				(2,090		)
Distributions declared ($0.30 per share)																														(43,193		)	(760		)	(43,953		)
BALANCE, June 30, 2012	6,300,000		$	63		143,367,946		—	293,122		$	1,431	$	2,826,475		$	—	$	5,436		$	(5,436	)	$	493,266		$	(16,449	)	$	(1,442,662	)	$	31,605		$	1,893,729

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June 30, 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
BALANCE, 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																								(6,508		)							(216		)	(6,724		)
Comprehensive loss																											(529		)				(10		)	(539		)
Issuance of Common Shares of Beneficial Interest				679,285						7		8,265																								8,272
Equity issuance costs												(234		)																			(26		)	(260		)
Conversion of LP Units to Common Shares				92,992						1		1,098																					(1,099		)	—
Bonus Share Issuance						(463	)	463							12			5			(5		)	(6		)										6
Vesting of Restricted Shares				85,248		(116,216	)	9,043		1		(1,820		)	3,062									(1,598		)										(355		)
Restricted Share Amortization												1,519																								1,519
Restricted Performance Units Amortization												780																								780
Exercise of Share Options				76,887						1		428																								429
Share Option Amortization												728																								728
Outperformance Plan Amortization												109																								109
Share Issuance from/to Deferred Compensation Plan				(487	)			(4,935	)			(16		)				(42		)	42															(16		)
Share Choice Plan Issuance				(1,684	)							(55		)																						(55		)
Trustees Fees Paid in Shares				2,672								32																								32
Adjustment to Non-controlling Interest												2,679																					(2,679		)	—
Preferred Share distributions																														(3,996		)				(3,996		)
Distributions declared ($0.30 per share)																														(40,836		)	(824		)	(41,660		)
BALANCE, June 30, 2011	4,300,000	$	43	135,536,709		—		295,852		$	1,353	$	2,684,730		$	—		$	5,737		$	(5,737	)	$	475,327		$	(2,474	)	$	(1,346,353	)	$	123,418		$	1,936,044

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

10

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands)

	Six-month periods ended
	June 30,
	2012			2011
Cash flows from operating activities:
Net income (loss)	$	16,138		$	(6,724	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	101,624			109,776
Amortization of deferred financing costs	2,572			1,998
Amortization of debt discount/(premium), net	745			529
Amortization of stock compensation costs	2,433			3,063
Shares used for employee taxes upon vesting of share awards	(2,234		)	(1,012		)
Straight-line rent income	(12,861		)	(9,447		)
Amortization of acquired above (below) market leases to rental revenue, net	(2,922		)	(2,636		)
Straight-line ground rent expense	949			975
Provision for doubtful accounts	962			689
Real estate venture income in excess of distributions	(590		)	(1,618		)
Net gain on sale of interests in real estate	(24,834		)	(6,627		)
Loss on early extinguishment of debt	1,498			756
Changes in assets and liabilities:
Accounts receivable	3,561			2,063
Other assets	5,260			2,231
Accounts payable and accrued expenses	(11,546		)	(4,500		)
Deferred income, gains and rent	(2,871		)	(5,048		)
Deferred financing obligation	(825		)	—
Other liabilities	(1,438		)	3,874
Net cash from operating activities	75,621			88,342
Cash flows from investing activities:
Acquisition of properties	(9,226		)	(22,032		)
Investments in available-for-sale securities	(98,744		)	—
Proceeds from the sale of available-for-sale securities	56,322			—
Sales of properties, net	120,957			5,639
Proceeds from repayment of mortgage notes receivable	23,931			—
Capital expenditures	(51,701		)	(67,768		)
Advances for purchase of tenant assets, net of repayments	283			(386		)
Loan provided to an unconsolidated Real Estate Venture partner	—			(1,045		)
Investment in unconsolidated Real Estate Ventures	(18,617		)	—
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	1,723			3,063
Leasing costs	(14,940		)	(14,724		)
Net cash from (used in) investing activities	9,988			(97,253		)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000			—
Proceeds from Credit Facility	21,500			181,500
Repayments of Credit Facility	(297,000		)	(322,500		)
Repayments of mortgage notes payable	(6,028		)	(122,204		)
Proceeds from unsecured notes	—			321,498
Deferred financing obligation non-cash interest expense	468			—
Net proceeds from issuance of common shares	—			8,069
Net proceeds from issuance of preferred shares	96,240			—
Redemption of preferred shares	(50,188		)	—
Repayments of unsecured notes	(167,371		)	(23,931		)
Repayments of unsecured term loan	(37,500		)	—
Net settlement of hedge transactions	(74		)	(613		)
Debt financing costs	(8,431		)	(3,662		)
Exercise of stock options	276			429
Distributions paid to shareholders	(47,059		)	(44,669		)
Distributions to noncontrolling interest	(797		)	(838		)
Net cash from (used in) financing activities	104,036			(6,921		)
Increase (decrease) in cash and cash equivalents	189,645			(15,832		)
Cash and cash equivalents at beginning of period	410			16,565
Cash and cash equivalents at end of period	$	190,055		$	733
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2012 and 2011 of $1,207 and $859, respectively	$	69,480		$	67,098
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,735		)	903
Change in capital expenditures financed through retention payable at period end	56			(5,500		)
Change in unfunded tenant allowance	(1,144		)	514

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

11

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED BALANCE SHEETS

(in thousands, except unit and per unit information)

	June 30, 2012			December 31, 2011
	(unaudited)
ASSETS
Real estate investments:
Operating properties	$	4,639,047		$	4,793,080
Accumulated depreciation	(897,367		)	(865,710		)
Operating real estate investments, net	3,741,680			3,927,370
Construction-in-progress	57,420			25,083
Land inventory	109,564			109,008
Total real estate investments, net	3,908,664			4,061,461
Cash and cash equivalents	190,055			410
Available-for-sale securities	42,072			—
Accounts receivable, net	11,445			14,718
Accrued rent receivable, net	113,380			108,101
Assets held for sale, net	41,450			—
Investment in real estate ventures, at equity	133,292			115,807
Deferred costs, net	114,920			115,362
Intangible assets, net	57,927			70,515
Notes receivable	7,226			18,186
Other assets	48,739			53,158
Total assets	$	4,669,170		$	4,557,718
LIABILITIES AND EQUITY
Mortgage notes payable	$	505,214		$	511,061
Unsecured credit facility	—			275,500
Unsecured term loans	600,000			37,500
Unsecured senior notes, net of discounts	1,404,627			1,569,934
Accounts payable and accrued expenses	57,653			69,929
Distributions payable	24,889			23,895
Deferred income, gains and rent	95,390			99,569
Acquired lease intangibles, net	31,526			35,106
Other liabilities	55,264			45,528
Liabilities related to assets held for sale	878			—
Total liabilities	2,775,441			2,668,022
Commitments and contingencies (Note 17)
Redeemable limited partnership units at redemption value; 2,657,721 and 2,698,648 issued and outstanding in 2012 and 2011, respectively	40,106			38,370
Brandywine Operating Partnership, L.P.’s equity:
7.50% Series D Preferred Mirror Units; issued and outstanding- 0 in 2012 and 2,000,000 in 2011	—			47,912
7.375% Series E Preferred Mirror Units; issued and outstanding- 2,300,000 in 2012 and 2011, respectively	55,538			55,538
6.90% Series E-Linked Preferred Mirror Units; issued and outstanding- 4,000,000 in 2012 and 0 in 2011	96,850			—
General Partnership Capital, 143,367,946 and 142,690,755 units issued in 2012 and 2011, respectively and 143,367,946 and 142,690,755 units outstanding in 2012 and 2011, respectively	1,717,657			1,754,302
Accumulated other comprehensive loss	(16,422		)	(6,426		)
Total Brandywine Operating Partnership, L.P.’s equity	1,853,623			1,851,326
Total liabilities and partners’ equity	$	4,669,170		$	4,557,718

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

12

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited, in thousands, except unit and per unit information)

	For the three-month periods ended						For the six-month periods ended
	June 30,						June 30,
	2012			2011			2012			2011
Revenue:
Rents	$	115,032		$	114,995		$	229,271		$	230,328
Tenant reimbursements	18,605			18,237			37,613			40,177
Termination fees	101			1,948			1,591			2,516
Third party management fees, labor reimbursement and leasing	2,872			2,733			6,014			5,486
Other	966			1,336			2,498			2,359
Total revenue	137,576			139,249			276,987			280,866
Operating Expenses:
Property operating expenses	37,906			39,115			77,363			83,235
Real estate taxes	14,134			13,786			28,228			27,495
Third party management expenses	1,264			1,506			2,514			3,016
Depreciation and amortization	49,331			55,710			98,880			105,214
General & administrative expenses	6,079			5,890			12,129			12,134
Total operating expenses	108,714			116,007			219,114			231,094
Operating income	28,862			23,242			57,873			49,772
Other Income (Expense):
Interest income	1,841			421			2,324			862
Interest expense	(32,981		)	(34,738		)	(67,125		)	(67,131		)
Interest expense — amortization of deferred financing costs	(1,261		)	(1,070		)	(2,572		)	(1,998		)
Interest expense — financing obligation	(196		)	—			(378		)	—
Equity in income of real estate ventures	838			1,088			882			2,321
Net gain on sale of interests in real estate	—			—			—			2,791
Loss on early extinguishment of debt	(1,250		)	(756		)	(1,498		)	(756		)
Loss from continuing operations	(4,147		)	(11,813		)	(10,494		)	(14,139		)
Discontinued operations:
Income from discontinued operations	783			1,743			1,798			3,579
Net gain on disposition of discontinued operations	10,166			3,836			24,834			3,836
Total discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	6,802			(6,234		)	16,138			(6,724		)
Distribution to Preferred Units	(3,049		)	(1,998		)	(5,047		)	(3,996		)
Preferred unit redemption charge	(2,090		)	—			(2,090		)	—
Amount allocated to unvested restricted unitholders	(95		)	(121		)	(191		)	(263		)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$	1,568		$	(8,353	)	$	8,810		$	(10,983	)
Basic income (loss) per Common Partnership Unit:
Continuing operations	$	(0.06	)	$	(0.10	)	$	(0.12	)	$	(0.13	)
Discontinued operations	0.07			0.04			0.18			0.05
	$	0.01		$	(0.06	)	$	0.06		$	(0.08	)
Diluted income (loss) per Common Partnership Unit:
Continuing operations	$	(0.06	)	$	(0.10	)	$	(0.12	)	$	(0.13	)
Discontinued operations	0.07			0.04			0.18			0.05
	$	0.01		$	(0.06	)	$	0.06		$	(0.08	)
Basic weighted average common partnership units outstanding	145,958,358			145,220,765			145,721,890			144,852,515
Diluted weighted average common partnership units outstanding	145,958,358			145,220,765			145,721,890			144,852,515
Net income (loss) attributable to Brandywine Operating Partnership, L.P.
Loss from continuing operations	$	(4,147	)	$	(11,813	)	$	(10,494	)	$	(14,139	)
Income from discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)

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

13

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited, in thousands)

	For the three-month periods ended						For the six-month periods ended
	June 30,						June 30,
	2012			2011			2012			2011
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)
Comprehensive income (loss):
Unrealized loss on derivative financial instruments	(10,650		)	—			(10,623		)	(613		)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76			51			124			74
Unrealized loss on available-for-sale securities	(65		)	—			(65		)	—
Total comprehensive income (loss)	(10,639		)	51			(10,564		)	(539		)
Comprehensive income (loss) attributable to Brandywine Operating Partnership, L.P.	$	(3,837	)	$	(6,183	)	$	5,574		$	(7,263	)

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

14

BRANDYWINE OPERATING PARTNERSHIP L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands)

	Six-month periods ended
	June 30,
	2012			2011
Cash flows from operating activities:
Net income (loss)	$	16,138		$	(6,724	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	101,624			109,776
Amortization of deferred financing costs	2,572			1,998
Amortization of debt discount/(premium), net	745			529
Amortization of stock compensation costs	2,433			3,063
Shares used for employee taxes upon vesting of share awards	(2,234		)	(1,012		)
Straight-line rent income	(12,861		)	(9,447		)
Amortization of acquired above (below) market leases, net	(2,922		)	(2,636		)
Straight-line ground rent expense	949			975
Provision for doubtful accounts	962			689
Real estate venture income in excess of distributions	(590		)	(1,618		)
Net gain on sale of interests in real estate	(24,834		)	(6,627		)
Loss on early extinguishment of debt	1,498			756
Changes in assets and liabilities:
Accounts receivable	3,561			2,063
Other assets	5,260			2,231
Accounts payable and accrued expenses	(11,546		)	(4,500		)
Deferred income, gains and rent	(2,871		)	(5,048		)
Deferred financing obligation	(825		)	—
Other liabilities	(1,438		)	3,874
Net cash from operating activities	75,621			88,342
Cash flows from investing activities:
Acquisition of properties	(9,226		)	(22,032		)
Investments in available-for-sale securities	(98,744		)	—
Proceeds from available-for-sale securities	56,322			—
Sales of properties, net	120,957			5,639
Proceeds from repayment of mortgage notes receivable	23,931			—
Capital expenditures	(51,701		)	(67,768		)
Advances for purchase of tenant assets, net of repayments	283			(386		)
Loan provided to unconsolidated real estate venture partner	—			(1,045		)
Investment in unconsolidated Real Estate Ventures	(18,617		)	—
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	1,723			3,063
Leasing costs	(14,940		)	(14,724		)
Net cash from (used in) investing activities	9,988			(97,253		)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000			—
Proceeds from Credit Facility borrowings	21,500			181,500
Repayments of Credit Facility borrowings	(297,000		)	(322,500		)
Repayments of mortgage notes payable	(6,028		)	(122,204		)
Proceeds from unsecured notes	—			321,498
Deferred financing obligation non-cash interest expense	468			—
Net proceeds from issuance of common units	—			8,069
Net proceeds from issuance of preferred units	96,240			—
Redemption of preferred units	(50,188		)	—
Repayments of unsecured notes	(167,371		)	(23,931		)
Repayments of unsecured term loan	(37,500		)	—
Net settlement of hedge transactions	(74		)	(613		)
Debt financing costs	(8,431		)	(3,662		)
Exercise of stock options	276			429
Distributions paid to preferred and common partnership unitholders	(47,856		)	(45,507		)
Net cash from (used in) financing activities	104,036			(6,921		)
Increase (decrease) in cash and cash equivalents	189,645			(15,832		)
Cash and cash equivalents at beginning of period	410			16,565
Cash and cash equivalents at end of period	$	190,055		$	733
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended June 30, 2012 and 2011 of $1,207 and $859, respectively	$	69,480		$	67,098
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,735		)	903
Change in capital expenditures financed through retention payable at period end	56			(5,500		)
Change in unfunded tenant allowance	(1,144		)	514

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

15

BRANDYWINE REALTY TRUST AND BRANDYWINE OPERATING PARTNERSHIP, L.P.

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2012

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 June 30, 2012, owned a 98.2% 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 June 30, 2012, the Company owned 230 properties, consisting of 204 office properties, 20 industrial facilities, five mixed-use properties and one development property (collectively, the “Properties”) containing an aggregate of approximately 24.9 million net rentable square feet. In addition, as of June 30, 2012, the Company owned economic interests in 18 unconsolidated real estate ventures that contain approximately 6.5 million net rentable square feet (collectively, the “Real Estate Ventures”). As of June 30, 2012, the Company also owned 444 acres of undeveloped land, and held options to purchase approximately 52 additional acres of undeveloped land. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern and Central New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord, Carlsbad and Rancho Bernardo, California.

The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of June 30, 2012, the management company subsidiaries were managing properties containing an aggregate of approximately 32.3 million net rentable square feet, of which approximately 24.9 million net rentable square feet related to Properties owned by the Company and approximately 7.4 million net rentable square feet related to properties owned by third parties and Real Estate Ventures.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments (consisting solely of normal recurring matters) for a fair statement of the financial position of the Company as of June 30, 2012, the results of its operations for the three and six-month periods ended June 30, 2012 and 2011 and its cash flows for the six-month periods ended June 30, 2012 and 2011 have been included. The results of operations for such interim periods are not necessarily indicative of the results for a full year. These consolidated financial statements should be read in conjunction with the Parent Company’s and the Operating Partnership’s consolidated financial statements and footnotes included in their combined 2011 Annual Report on Form 10-K filed with the SEC on February 24, 2012.

Reclassifications

Certain amounts have been reclassified in prior years to conform to the current year presentation. The reclassifications are primarily due to the treatment of sold properties as discontinued operations on the statement of operations for all periods presented.

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 that the Company has determined to be VIEs but for which it is not the primary beneficiary, its maximum exposure to loss is the carrying amount of its investments, as the Company has not provided any guarantees other than the guarantee described for PJP VII which was

16

approximately $0.7 million at June 30, 2012 (see Note 4). Also, for all entities determined to be VIEs, the Company does not provide financial support to the real estate ventures through liquidity arrangements, guarantees or other similar commitments. 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, or the general partners as a group, controls a limited partnership or similar entity when the limited partners 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 that the Company controls through its general partner status, but the limited partners in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights. 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 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, real estate venture agreements, LLC 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 entities that are consolidated but 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 related costs are expensed 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 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 amounts representing the value of tenant relationships and 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 generally 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 generally 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 three 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

17

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.

Characteristics considered by the Company in allocating value to its tenant relationships include the nature and extent of the Company’s business relationship with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals, among other factors. The value of tenant relationship intangibles is generally 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 generally amortized over the remaining non-cancelable term of the respective leases and any fixed-rate renewal periods.

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

Impairment or Disposal of Long-Lived Assets

The accounting standard for property, plant and equipment provides a single accounting model for long-lived assets classified as held-for-sale; defines the scope of businesses to be disposed of that qualify for reporting as discontinued operations; and affects the timing of recognizing losses on such operations.

The Company reviews long-lived assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The review of recoverability is based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the long-lived asset’s use and eventual disposition. These cash flows consider factors such as expected future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a long-lived asset, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair-value of the property. The Company is required to make subjective assessments as to whether there are impairments in the values of the investments in long-lived assets. These assessments have a direct impact on its net income because recording an impairment loss results in an immediate negative adjustment to net income. 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. Although the Company’s strategy is generally to hold its properties over the long-term, the Company will selectively dispose of properties for strategic needs. If the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized to reduce the property to the lower of the carrying amount or fair value less costs to sell, and such loss could be material. If the Company determines that impairment has occurred and the assets are classified as held and used, the affected assets must be reduced to their fair-value.

Where properties have been identified as having a potential for sale, additional judgments are required related to the determination as to the appropriate period over which the undiscounted cash flows should include the operating cash flows and the amount included as the estimated residual value. Management determines the amounts to be included based on a probability weighted cash flow. This requires significant judgment. In some cases, the results of whether an impairment is indicated are sensitive to changes in assumptions input into the estimates, including the hold period until expected sale.

The Company determined during its impairment review for the three and six-month periods ended June 30, 2012 and 2011, that no impairment charges were necessary.

The Company entered into development agreements related to two parcels of land under option for ground lease that require the Company to commence development by December 31, 2012. If the Company determines that construction cannot be started by the specified date, or that it is not in the Company's best economic interest to develop either parcel or negotiate an extension of the development period, the Company will then write off the parcel-specific costs that it has incurred in preparing these parcels of land for development, as it will have lost its rights under the ground lease. These costs, amounting to $7.9 million as of June 30, 2012, would have to be written-off in the period that it is determined that the development would not be commenced and an extension cannot be negotiated.

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.

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Under the equity method, investments in unconsolidated joint 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 impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the 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.

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 $5.3 million and $11.6 million for the three and six-month periods ended June 30, 2012, and approximately $4.1 million and $8.3 million for the three and six-month periods ended June 30, 2011, respectively. 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 $0.6 million and $1.2 million for the three and six-month periods ended June 30, 2012, and by $0.6 million and $1.2 million for the three and six-month periods ended June 30, 2011, respectively. 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 $0.1 million and $0.5 million for the three and six-month periods ended June 30, 2012, and by $0.4 million and $0.6 million for the three and six-month periods ended June 30, 2011, respectively.

Leases also typically provide for tenant reimbursement of a portion of common area maintenance 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, significant assumptions and judgments are made by the Company in determining the lease term such as when termination options are provided to the tenant. The lease term impacts the period over which minimum rents are determined and recorded and also considers the period over which lease related costs are amortized. Termination fees received from tenants, bankruptcy settlement fees, third party management fees, labor reimbursement and leasing income are recorded when earned.

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 June 30, 2012, 5,272,017 common shares remained available for future awards under the 1997 Plan (including 4,108,336 shares available solely for options and share appreciation rights). Through June 30, 2012, all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $1.9 million and $3.6 million during the three and six-month periods ended June 30, 2012, of which $0.5 million and $0.9 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company incurred stock-based compensation expense of $1.6 million and $3.3 million during the three and six-month periods ended June 30, 2011, of which $0.4 million and $0.7 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.

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.

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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 outstanding available-for-sale securities, certificates of deposit and 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 June 30, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	June 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Available-for-Sale Securities	$	42,072	$	42,072	$	—	$	—
Liabilities:
Interest Rate Swaps	$	14,519	$	—	$	14,519	$	—

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, 2011 (in thousands):

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	Fair Value Measurements at Reporting Date Using:
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2011		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	3,886	$	—	$	3,886	$	—

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.

There were no items that were accounted for at fair value on a non-recurring basis for the six months ended June 30, 2012.

Available-for-sale securities and transfers of held-to-maturity securities

On March 23, 2012, the Company acquired a $50.0 million tranche of Banco Santander Chile Senior Notes, with $0.2 million premium paid for the debt securities and $0.5 million of accrued interest income. On the acquisition date, the bonds were designated by the Company as held-to-maturity securities, based upon the nature of the transaction, the Company's intention and ability to hold the securities to maturity, and other applicable guidance surrounding prepayment risk, liquidity needs, yield on alternative investments and other factors associated with the accounting standard for certain investments in debt and equity securities. The securities earn interest income at a rate of 2.875% annually, and are scheduled to mature on November 13, 2012. Throughout the second quarter of 2012, the Company sold $20.0 million of these securities, recognizing a nominal loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Company's best interest.

Subsequent to the above sales transaction, the Company transferred its entire remaining portfolio of held-to-maturity securities, as well as any investments made during the second quarter of 2012, to a designation of available-for-sale, consistent with the requirements of the accounting standard for the classification of debt and equity securities. Please refer to the Fair Value Measurements section for further discussion.

The following table sets forth the fair value of the available-for-sale securities held by the Company as of June 30, 2012 (in thousands):

	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value (Net Carrying Amount)
Available-for-sale securities (a)	$	42,142	$	(70	)	$	42,072

(a) The Company's available-for-sale securities at June 30, 2012 include securities with maturity dates ranging from September 1, 2012 to November 13, 2012, with related interest rates ranging from 2.875% to 5.450%.

The Company did not hold any available-for-sale or held-to-maturity securities as of December 31, 2011.

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The following table sets forth the details of the previously designated held-to-maturity securities sold during the second quarter of 2012 (in thousands):

	Held-to-Maturity Securities Sold
	Cash Received		Principal Amount		Loss
Banco Santander Chile Senior Notes	$	20,009	$	20,042	$	(33	)

Notes Receivable

As of June 30, 2012, notes receivable included a $7.2 million purchase money mortgage with a 20 year amortization period that bears interest at 8.5%.

As of December 31, 2011, notes receivable included a $7.2 million purchase money mortgage with a 20 year amortization period that bears interest at 8.5%, a $0.5 million loan (due in 2015) that bears interest at 10%, and a $23.4 million (including accrued but unpaid interest) seven year purchase money mortgage (due 2016) that bears interest at approximately 6% cash pay/7.64% accrual.

During the current quarter, the $23.5 million 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.

During the current quarter, the $0.3 million loan (balance as of the payment date) bearing interest at 10% was also paid in full. This loan was previously due in 2015 before being paid in full.

The Company periodically assesses the collectability of the notes receivable in accordance with the accounting standard for loan receivables. The Company's $7.2 million outstanding purchase money mortgage note mentioned above was extended to a buyer (the “Borrower”) of a parcel of land in Newtown, Pennsylvania in December 2006. During 2011, the Borrower, who is developing a residential community, defaulted on the note and as a result, a forbearance agreement was entered into between the Company and the Borrower. The Borrower also entered into another forbearance agreement with a third party senior creditor bank related to the senior creditor's loan. The forbearance agreement between the Company and the Borrower outlined the repayment terms of the outstanding debt and the payment of accrued interest by the Borrower and included, among other things, the metrics for selling and settling on home sales over an agreed period of time. With the inherent credit risk in collecting interest from the note, as provided in the forbearance agreement, the Company has provided a full allowance for any accrued interest receivable. The Company has determined that the loan modification as discussed above represents a troubled debt restructuring since the Borrower was considered to be in a financial difficulty when it defaulted on the two mortgage debts and that a concession was granted in the form of the forbearance agreements. Construction has already recommenced, with loan repayments being paid to the senior creditor beginning in the first quarter of 2012. Loan repayments to the Company are scheduled to begin during 2013. In December of the prior year, the Borrower provided the Company and the third party senior creditor bank with expected future cash flows analysis showing its ability to meet its sales targets in 2012, with updates to the analysis being provided on a quarterly basis. The Company believes that, based on expected cash flows from the project and actual current year-to-date sales, the total note will be fully paid by 2015. The Company and the third party senior creditor bank allowed the Borrower to operate under the cash flow assumptions without amending the forbearance agreements. Given the current circumstances, the Company performed a collectability assessment of its note using the expected cash flow information provided by the Borrower and obtained third party documentation to support the assumptions used by the Borrower. The key assumptions used in the cash flow analysis included the revenue per home built; the cost to construct; the general and administrative expenses incurred to operate the business and sell homes; and the absorption assumptions used to determine the rate of home sales. The Company has determined based on the results of its probability weighted cash flow analysis that, as of June 30, 2012, the present value of the expected cash flows of the note receivable exceeded the outstanding balance of the note and therefore the note is recoverable as of June 30, 2012. However, it is still possible that due to further deterioration in the housing market, the Borrower will not meet its sales targets, and could cause a loan loss of the Company's note receivable which could be material to its consolidated results of operations.

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

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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 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.

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 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 taxable TRSs, which are subject to federal, state and local income tax.

Recent Accounting Pronouncements

In January 2012, the Financial Accounting Standards Board (FASB) issued an amendment to the accounting standard for the presentation of comprehensive income. The amendment requires entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In addition, the amendment requires entities to present on the face of the financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. This amendment is effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations as the amendment relates only to changes in financial statement presentation.

In January 2012, the FASB issued amendments to the accounting standard for fair value measurements and disclosures. The amendments change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendments are intended to create comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with U.S. GAAP and International Financial Reporting Standards. These amendments are effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations.

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3. REAL ESTATE INVESTMENTS

As of June 30, 2012 and December 31, 2011 the gross carrying value of the Company’s Properties was as follows (in thousands):

	June 30, 2012		December 31, 2011
Land	$	649,690	$	677,891
Building and improvements	3,522,597		3,631,388
Tenant improvements	466,760		483,801
	$	4,639,047	$	4,793,080

Acquisitions

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 through an advance under its Credit Facility, since repaid with available corporate funds. The Company also capitalized $0.1 million of acquisition related costs, in accordance with guidance on asset acquisitions.

Dispositions

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. The property was 83.7% occupied as of the sale date.

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. The property was 100.0% occupied as of the date of sale.

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. The property was 90.1% occupied as of the date of sale.

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

4. INVESTMENT IN UNCONSOLIDATED VENTURES

As of June 30, 2012, the Company had an aggregate investment of approximately $133.3 million in 18 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 properties. As of June 30, 2012, 15 of the Real Estate Ventures owned 51 office buildings that contain an aggregate of approximately 6.5 million net rentable square feet; two Real Estate Ventures owned four acres of undeveloped parcels of land; 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 following is a summary of the financial position of the Real Estate Ventures as of June 30, 2012 and December 31, 2011 (in thousands):

	June 30, 2012		December 31, 2011
Net property	$	840,292	$	846,643
Other assets	113,449		110,520
Other liabilities	46,225		48,798
Debt	679,026		745,830
Equity	228,490		162,535
Company’s share of equity (Company’s basis)	133,292		115,807

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The following is a summary of results of operations of the Real Estate Ventures for the three and six-month periods ended June 30, 2012 and 2011 (in thousands):

	Three-month periods ended June 30,				Six-month periods ended June 30,
	2012		2011		2012		2011
Revenue	$	39,008	$	32,722	$	77,601	$	72,398
Operating expenses	11,000		14,370		27,815		30,544
Interest expense, net	9,840		9,550		21,089		21,673
Depreciation and amortization	13,887		8,487		25,358		18,968
Net income (loss)	4,281		315		3,339		1,213
Company’s share of income (Company’s basis)	838		1,088		882		2,321

As of June 30, 2012, the Company had guaranteed repayment of approximately $0.7 million of loans on behalf of a Real Estate Venture. The Company, from time to time, also provides customary environmental indemnities in connection with construction and permanent financing both for its own account and on behalf of its Real Estate Ventures.

5. DEFERRED COSTS

As of June 30, 2012 and December 31, 2011, the Company’s deferred costs were comprised of the following (in thousands):

	June 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	136,451	$	(53,224	)	$	83,227
Financing Costs	40,800		(9,107		)	31,693
Total	$	177,251	$	(62,331	)	$	114,920

	December 31, 2011
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	140,772	$	(50,990	)	$	89,782
Financing Costs	38,929		(13,349		)	25,580
Total	$	179,701	$	(64,339	)	$	115,362

During the three and six-month periods ended June 30, 2012, the Company capitalized internal direct leasing costs of $1.4 million and $2.7 million, respectively, and $1.7 million and $3.2 million during the three and six-month periods ended June 30, 2011, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

6. INTANGIBLE ASSETS

As of June 30, 2012 and December 31, 2011, the Company’s intangible assets were comprised of the following (in thousands):

	June 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	82,861	$	(54,017	)	$	28,844
Tenant relationship value	67,414		(44,560		)	22,854
Above market leases acquired	8,729		(2,500		)	6,229
Total	$	159,004	$	(101,077	)	$	57,927
Below market leases acquired	$	74,100	$	(42,574	)	$	31,526

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	December 31, 2011
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	91,426	$	(55,498	)	$	35,928
Tenant relationship value	72,813		(45,114		)	27,699
Above market leases acquired	12,744		(5,856		)	6,888
Total	$	176,983	$	(106,468	)	$	70,515
Below market leases acquired	$	75,685	$	(40,579	)	$	35,106

As of June 30, 2012, the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no early lease terminations):

	Assets		Liabilities
2012 (six months remaining)	$	8,083	$	3,321
2013	12,358		6,308
2014	9,549		4,741
2015	7,159		2,597
2016	4,526		1,704
Thereafter	16,252		12,855
Total	$	57,927	$	31,526

7. DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at June 30, 2012 and December 31, 2011 (in thousands):

MORTGAGE DEBT:

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Property / Location	June 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,713		$	56,538		7.25	%		May-13
Southpoint III	1,511			1,887			7.75	%		Apr-14
Tysons Corner	94,045			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,687			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	200,051			202,905			7.00	%		Sep-30
Cira South Garage	43,356			44,379			7.12	%		Sep-30
Principal balance outstanding	506,363			512,391
Plus: fair market value premiums (discounts), net	(1,149		)	(1,330		)
Total mortgage indebtedness	$	505,214		$	511,061
UNSECURED DEBT:
Former Term Loan	—			37,500			LIBOR + 0.80%		(b)	Feb-12
Former Revolving Credit Facility	—			275,500			LIBOR + 0.725%		(b)	Feb-12
New Revolving Credit Facility	—			—			LIBOR + 1.50%		(b)	Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			—			2.60	%	(b)	Feb-15
Four-Year Term Loan - Swapped to fixed	150,000			—			2.88	%	(b)	Feb-16
Four-Year Term Loan - Variable	100,000			—			LIBOR + 1.75%		(b)	Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			—			3.62	%	(b)	Feb-19
$300.0M 5.750% Guaranteed Notes due 2012	—			151,491			5.73	%	(c)	Apr-12
$250.0M 5.400% Guaranteed Notes due 2014	238,379			242,681			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	217,239			227,329			7.77	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	250,000			250,000			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.75	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.14	%		Apr-18
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	2,009,228			1,888,111
plus: original issue premium (discount), net	(4,601		)	(5,177		)
Total unsecured indebtedness	$	2,004,627		$	1,882,934
Total Debt Obligations	$	2,509,841		$	2,393,995

(a) This loan was assumed upon acquisition of the related property. The interest rate reflects the market rate at the time of acquisition.

(b) On February 1, 2012, the Company closed on a new $600.0 million four-year unsecured credit facility and three unsecured term loans totaling $600.0 million which consist of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. The Company used a portion of the net proceeds from the term loans to repay all balances outstanding under its Former Revolving Credit Facility and its former $183.0 million Bank Term Loan which were then retired prior to their scheduled June 29, 2012 maturity.

(c) Notes matured on April 1, 2012.

During the six-month periods ended June 30, 2012 and June 30, 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 6.72% and 6.59%, respectively.

During the six-months ended June 30, 2012, the Company repurchased $14.7 million of its outstanding unsecured Notes in a series of transactions that are summarized in the following table (in thousands):

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Notes	Repurchase Amount		Principal		Loss			Deferred Financing Amortization
2012 5.750% Notes	$	309	$	301	$	(2	)	$	—
2014 5.400% Notes	4,630		4,302		(264		)	7
2015 7.500% Notes	11,537		10,090		(1,233		)	9
	$	16,476	$	14,693	$	(1,499	)	$	16

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 Company utilizes its unsecured new revolving credit facility (the "New Credit Facility") for potential borrowings and for general business purposes, including the acquisition, development and redevelopment of properties and the repayment of other debt. The maturity date of the New Credit Facility in place at June 30, 2012 is February 1, 2016. The per annum variable interest rate on any related outstanding balances, for which there were none at June 30, 2012, 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. As of June 30, 2012, the Company had no related borrowings, with $3.2 million in letters of credit outstanding, leaving $596.8 million of unused availability under the New Credit Facility. During the six-months ended June 30, 2011, the weighted-average interest rate on Former Credit Facility borrowings was 1.01%. As of June 30, 2011, the weighted average interest rate on the Former Credit Facility was 0.99%. There were no comparable rates as of June 30, 2012 due to the fact that the Company had no borrowings on its New Credit Facility during the current period.

The Company has the option to increase the amounts available to be advanced under the New Credit Facility, the $150.0 million three-year term loan, and the $250.0 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 New Credit Facility, the $150.0 million three-year term loan and the $250.0 million four-year term loan by one year, subject to payment of an extension fee and other customary conditions and limitations. The $150.0 million three-year term and the $250.0 million four-year term loans can be prepaid by the Company at any time without penalty. The $200.0 million seven-year term loan is subject to a declining prepayment penalty ranging from 3.00% a year after closing, 2.00% after two years, 1.00% after three years and without penalty thereafter.

The spread to LIBOR for LIBOR-based loans under the New Credit Facility and New Term Loans will depend 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, 175, 175 and 190 basis points under the New Credit Facility, the $150.0 million three-year term loan, the $250.0 million four-year term loan and the $200.0 million seven-year term loan, respectively. At the Company's option, loans 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 New 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, the rate on $300.0 million of notional principal for the other loans at rates in a range of 2.470% to 2.910% for periods of three to five years. All hedges commenced on February 1, 2012 and the rates are inclusive of the LIBOR spread based on the current investment grade rating. See Note 9 for details of the interest rate swaps entered into as of June 30, 2012.

The New Credit Facility and New Term Loans contain financial and operating covenants and restrictions. The Company was in compliance with all such restrictions and financial covenants as of June 30, 2012.

As of June 30, 2012, the Company’s aggregate scheduled principal payments of debt obligations, excluding amortization of discounts and premiums, were as follows (in thousands):

2012	$	6,444
2013	66,924
2014	250,612
2015	467,272
2016	596,609
Thereafter	1,127,730
Total principal payments	2,515,591
Net unamortized premiums/(discounts)	(5,750		)
Outstanding indebtedness	$	2,509,841

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8. FAIR VALUE OF FINANCIAL INSTRUMENTS

The following fair value disclosure was determined by the Company using available market information and discounted cash flow analyses as of June 30, 2012 and December 31, 2011, 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. The Company believes that the carrying amounts reflected in the consolidated balance sheets at June 30, 2012 and December 31, 2011 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):

	June 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable, net of discounts	$	506,363	$	553,976	$	512,391		$	545,784
Unsecured notes payable, net of discounts	$	1,330,618	$	1,411,533	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	8,785	$	31,157	(a)	$	32,756

_____________________

(a) For purposes of this disclosure, one of the notes is presented gross of the deferred gain of $12.9 million arising from the sale of two properties in 2009 accounted for under the accounting standard for installment sales.

The fair value of the Company's unsecured notes payable, net of discounts, is categorized at a Level 1 basis (as provided by the accounting standard for Fair Value Measurements and Discloses). This is because the Company valued these instruments using quoted market prices as of June 30, 2012 and December 31, 2011.

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 and notes receivable were 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. These financial instruments have been categorized as Level 3 due to the fact that the Company considers the rates used in the valuation techniques to be unobservable inputs.

The only significant unobservable input in the discounted cash flow model is the discount rate. 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. 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 unsecured notes and mortgage loans used as of June 30, 2012 was 3.237%. 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.

Disclosure about the fair value of financial instruments is based upon pertinent information available to management as of June 30, 2012 and December 31, 2011. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since June 30, 2012, and current estimates of fair value may differ from the amounts presented herein.

9. RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS

Risk Management

In the course of its on-going 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

29

counterparties on derivatives not fulfilling their obligations. Market risk is the risk of declines in the value of properties due to changes in rental rates, interest rates or other market factors affecting the valuation of properties held by the Company.

Risks and Uncertainties

Sluggish economic conditions have reduced the volume of real estate transactions and created credit stresses on many businesses. Vacancy rates may increase through 2012 and possibly beyond as the current economic climate negatively impacts tenants. The current financial markets also have an adverse effect on the Company’s other counter parties such as the counter parties in its derivative contracts.

The Company expects that the impact of the current state of the economy, including high unemployment and the continued volatility in the financial and credit markets, could continue to have a dampening effect on the fundamentals of its business, including potential increases in past due accounts, tenant defaults, lower occupancy and reduced effective rents. These conditions would negatively affect the Company’s future net income and cash flows and could have a material adverse effect on its financial condition.

The Company’s New Credit Facility, New Term Loans and the indenture governing the 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 New 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 New Credit Facility, the New 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 New 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 New Credit Facility. While the Company believes that there are currently no material adverse effect events, the Company is operating in unprecedented economic times and it is possible that such event could arise which would limit the Company’s borrowings under the New 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 New Credit Facility and the borrowings under the New Credit Facility would become due and payable. 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 June 30, 2012. 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 of a continued slow-down in the credit markets, the Company may not be able to remain in compliance with such covenants and if the lenders would not provide a waiver, an event of default could result.

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)

30

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 June 30, 2012 and December 31, 2011. 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
				6/30/2012		12/31/2011						6/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	7,600	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	1,803		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	385		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	207		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	704		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,126		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	801		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	969		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	924		—
				$	578,610	$	452,836					$	14,519	$	3,886

(a) Hedging unsecured variable rate debt.

Concentration of Credit Risk

Concentrations of credit risk arise when a number of tenants related to the Company’s investments or rental operations are engaged in similar business activities, or are located in the same geographic region, or have similar economic features that would cause their inability to meet contractual obligations, including those to the Company, to be similarly affected. 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 any unusual concentration of credit risk. No tenant accounted for 10% or more of the Company’s rents during the three and six-month periods ended June 30, 2012 and 2011. Conditions in the general economy and the global credit markets have had a significant adverse effect on companies in 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 go into default under their leases.

10. DISCONTINUED OPERATIONS

For the three and six-month periods ended June 30, 2012, income from discontinued operations relates to the three properties that the Company sold during 2012, as well as 11 properties that were designated as held-for-sale as of June 30, 2012. The Company determined that 11 of its flex/office properties located in Exton, Pennsylvania met the criteria for assets held-for-sale pursuant to the related requirements provided for the classification as held for sale under the accounting standard for long lived assets. Accordingly, at June 30, 2012, these properties are required to be measured at the lower of their carrying value or the estimated fair value less costs to sell. No provision for impairment was recognized at June 30, 2012 as the estimated fair value of the properties less costs to sell were higher than their carrying value. The following table summarizes the revenue and expense

31

information for properties classified as discontinued operations for the three and six-month periods ended June 30, 2012 (in thousands):

	Three-month period ended June 30, 2012		Six-month period ended June 30, 2012
Revenue:
Rents	$	2,003	$	6,113
Tenant reimbursements	343		758
Termination fees	—		7
Other	86		89
Total revenue	2,432		6,967
Expenses:
Property operating expenses	594		1,701
Real estate taxes	217		726
Depreciation and amortization	840		2,744
Total operating expenses	1,651		5,171
Other income (expense):
Interest income	2		2
Income from discontinued operations before gain on sale of interests in real estate	783		1,798
Net gain on disposition of discontinued operations	10,166		24,834
Income from discontinued operations	$	10,949	$	26,632

The following table summarizes the balance sheet information for the 11 properties identified as held-for-sale at June 30, 2012 (in thousands):

	June 30,
	2012
Real Estate Investments:
Operating properties	$	52,990
Accumulated depreciation	(14,385		)
	38,605
Construction-in-progress	36
	38,641
Receivables	1,374
Deferred costs, net	1,137
Other assets	298
Total assets held for sale	$	41,450
Liabilities held for sale	$	878

For the three and six-month periods ended June 30, 2011, income from discontinued operations relates to the seven properties that the Company sold from January 1, 2011 through June 30, 2012, as well as the 11 flex/office properties identified as held-for-sale at June 30, 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and six-month periods ended June 30, 2011 (in thousands):

	Three-month period ended June 30, 2011		Six-month period ended June 30, 2011
Revenue:
Rents	$	5,620	$	11,292
Tenant reimbursements	750		1,931
Other	5		2
Total revenue	6,375		13,225
Expenses:
Property operating expenses	1,581		3,639
Real estate taxes	707		1,446
Depreciation and amortization	2,344		4,561
Total operating expenses	4,632		9,646
Income from discontinued operations before gain on sale of interests in real estate	1,743		3,579
Net gain on disposition of discontinued operations	3,836		3,836
Income from discontinued operations	$	5,579	$	7,415

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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

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.

As of June 30, 2012 and December 31, 2011, the aggregate book value of the non-controlling interests associated with the redeemable common limited partnership interests in the accompanying consolidated balance sheet of the Parent Company was $31.6 million and $33.1 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 $32.8 million and $25.6 million, respectively.

12. BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following table details 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):

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Net income from continuing operations attributable to non-controlling interests	169			169			276			276
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(9,212		)	(9,212		)	(13,656		)	(13,656		)
Income from discontinued operations	10,949			10,949			5,579			5,579
Discontinued operations attributable to non-controlling interests	(200		)	(200		)	(111		)	(111		)
Discontinued operations attributable to common shareholders	10,749			10,749			5,468			5,468
Net income (loss) attributable to common shareholders	$	1,537		$	1,537		$	(8,188	)	$	(8,188	)
Denominator
Weighted-average shares outstanding	143,300,637			143,300,637			135,342,538			135,342,538
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.07	)	$	(0.07	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common shareholders	0.08			0.08			0.04			0.04
Net income (loss) attributable to common shareholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

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	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Net income (loss) from continuing operations attributable to non-controlling interests	322			322			364			364
Amount allocable to unvested restricted shareholders	(191		)	(191		)	(263		)	(263		)
Preferred share dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(17,500		)	(17,500		)	(18,034		)	(18,034		)
Income from discontinued operations	26,632			26,632			7,415			7,415
Discontinued operations attributable to non-controlling interests	(487		)	(487		)	(148		)	(148		)
Discontinued operations attributable to common shareholders	26,145			26,145			7,267			7,267
Net income (loss) attributable to common shareholders	$	8,645		$	8,645		$	(10,767	)	$	(10,767	)
Denominator
Weighted-average shares outstanding	143,060,796			143,060,796			134,962,093			134,962,093
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common shareholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common shareholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

Redeemable common limited partnership units totaling 2,657,721 and 9,809,759 as of June 30, 2012 and 2011, respectively, were excluded from the diluted earnings per share computations because their effect would have been anti-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 six months ended June 30, 2012 and 2011, earnings representing nonforfeitable dividends as noted in the table above 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 April 11, 2012, the Parent Company closed a registered public offering of 4,000,000 shares of its 6.90% Series E Cumulative Redeemable Preferred Shares at a price to the public of $25.00 per share. Dividends on the 6.90% Series E Cumulative Redeemable Preferred Shares will be paid quarterly in arrears on or about the 15th day of each January, April, July, and October, commencing July 15, 2012, at a rate per annum of 6.90% of the liquidation value of $25.00 per share (equivalent to $1.725 per share per annum). Net proceeds from the offering totaled approximately $96.3 million, after deducting the underwriting discount and our estimated expenses.

On May 3, 2012, the Parent Company used a portion of the net proceeds from the aforementioned offering of Series E Cumulative Redeemable Preferred Shares to redeem all 2,000,000 shares of its previously outstanding 7.50% Series C Cumulative Redeemable Preferred Shares at a redemption price of $50.0 million plus $0.2 million of accrued dividends through the redemption date. The Company used the remaining proceeds from the aforementioned offering for corporate purposes. In accordance with GAAP, the Company also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common shares for the three and six-month periods ended June 30, 2012. These costs are listed

34

above and shown within the Company's consolidated statements of operations as "Preferred share redemption charge". There were no comparable charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which was paid on July 19, 2012 to shareholders of record as of July 5, 2012. On May 31, 2012, the Parent Company declared distributions on its Series D Preferred Shares and Series E Preferred Shares to holders of record as of June 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series D Preferred Shares and Series E Preferred Shares totaled $1.1 million and $1.8 million, respectively.

In March 2010, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which the Parent Company may sell up to an aggregate amount of 15,000,000 common shares until March 10, 2013. The 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 as determined by the Company, including market conditions, the trading price of its common shares 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. During the six-month period ended June 30, 2012, the Parent Company did not sell any shares under the Offering Program. During the six-month period ended June 30, 2011, the Parent Company sold 679,285 shares under this program at an average sales price of $12.18 per share resulting in net proceeds of $8.0 million. The Parent Company contributed the net proceeds from the sale of its shares to the Operating Partnership in exchange for the issuance of 679,285 common partnership units to the Parent Company. The Operating Partnership used the net proceeds from the sales contributed by the Parent Company to repay balances on its Credit Facility and for general corporate purposes. From the inception of the Offering Program in March 2010 through June 30, 2012, the Parent Company had sold 6,421,553 shares under this program at an average sales price of $12.50 per share, resulting in 8,578,447 remaining shares available for sale.

Common Share Repurchases

The Parent Company maintains a share repurchase program pursuant to which the Parent Company is authorized to repurchase its common shares from time to time. The Parent Company’s Board of Trustees initially authorized this program in 1998 and has periodically replenished capacity under the program. On May 2, 2006 the Board of Trustees restored capacity to 3.5 million common shares.

The Parent Company did not repurchase any shares under the share repurchase program during the six-month period ended June 30, 2012. As of June 30, 2012, the Parent Company may purchase an additional 0.5 million 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.

13. PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following table details 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):

35

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(9,381		)	(9,381		)	(13,932		)	(13,932		)
Discontinued operations attributable to common unitholders	10,949			10,949			5,579			5,579
Net income (loss) attributable to common unitholders	$	1,568		$	1,568		$	(8,353	)	$	(8,353	)
Denominator
Weighted-average units outstanding	145,958,358			145,958,358			145,220,765			145,220,765
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common unitholders	0.07			0.07			0.04			0.04
Net income (loss) attributable to common unitholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Amount allocable to unvested restricted unitholders	(191		)	(191		)	(263		)	(263		)
Preferred unit dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(17,822		)	(17,822		)	(18,398		)	(18,398		)
Discontinued operations attributable to common unitholders	26,632			26,632			7,415			7,415
Net income (loss) attributable to common unitholders	$	8,810		$	8,810		$	(10,983	)	$	(10,983	)
Denominator
Weighted-average units outstanding	145,721,890			145,721,890			144,852,515			144,852,515
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common unitholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common unitholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

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 three-months ended June 30, 2012 and 2011, earnings representing nonforfeitable dividends as noted in the table above were allocated to the unvested restricted units.

Common Partnership Units and Preferred Mirror Units

On April 11, 2012, the Operating Partnership issued 6.90% Series E-Linked Preferred Mirror Units to the Parent Company, in connection with the previously mentioned Series E Preferred Share Offering. On May 3, 2012, the Operating Partnership also

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redeemed all of its Series D Preferred Mirror Units as a result of the aforementioned redemption of Series C Preferred Shares. In accordance with GAAP, the Operating Partnership also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common units for the three and six-month periods ended June 30, 2012. These costs are listed above and shown within the Operating Partnership's consolidated statements of operations as "Preferred unit redemption charge". There were no comparable charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on July 19, 2012 to unitholders of record as of July 5, 2012.

On May 31, 2012, the Operating Partnership declared distributions on its Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units to holders of record as of June 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units totaled $1.1 million and $1.8 million, respectively.

During the six-month period ended June 30, 2012, the Parent Company did not sell any shares related to the Offering Program.

The Operating Partnership issued 7,111,112 Class F (2010) Units on August 5, 2010 to a third party in connection with its acquisition of Three Logan Square. The Class F (2010) Units were valued based on the closing market price of the Parent Company’s common shares on the acquisition date ($11.54) less $0.60 to reflect that these units did not begin to accrue a dividend prior to the first anniversary of their issuance. The Class F (2010) Units were subject to redemption at the option of the holders after the first anniversary of the acquisition. The Operating Partnership had the option to satisfy the redemption either for an amount, per unit, of cash equal to the market price of one of the Parent Company’s common share (based on the five-day trading average ending on the date of the exchange) or for one of the Parent Company’s common shares. On December 23, 2011, the Operating Partnership satisfied in full the holder's tender for redemption of all 7,111,112 of the Class F (2010) Units through the issuance of 7,111,112 Parent Company's common shares.

Common Unit Repurchases

The Parent Company did not repurchase any shares under its share repurchase program during the six-month period ended June 30, 2012 and accordingly, during the six-month period ended June 30, 2011, the Operating Partnership did not repurchase any units in connection with the Parent Company’s share repurchase program.

14. SHARE BASED AND DEFERRED COMPENSATION

Stock Options

At June 30, 2012, the Parent Company had 3,483,537 options outstanding under its shareholder approved equity incentive plan. There were 671,783 options unvested as of June 30, 2012 and $1.6 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 1.3 years. During the three and six-month periods ended June 30, 2012 the Company recognized compensation expense related to unvested options of $0.4 million and $0.7 million, of which $0.1 million and a $0.2 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. During the three and six-month periods ended June 30, 2011, the Company recognized compensation expense related to unvested options of $0.4 million and $0.7 million, of which $0.1 million and $0.2 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization.

Option activity as of June 30, 2012 and changes during the six-months ended June 30, 2012 were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2012	3,599,672		$	14.50	7.20	$	(18,015,060	)
Granted	—		—		—	—
Exercised	(94,429	)	$	2.91	—	—
Canceled	(21,706	)	$	15.62
Outstanding at June 30, 2012	3,483,537		$	14.47	6.46	$	(8,656,997	)
Vested/Exercisable at June 30, 2012	2,811,754		$	15.56	6.33	$	(9,052,503	)

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Restricted Share Awards

As of June 30, 2012, 636,286 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 June 30, 2012 was approximately $4.7 million. That expense is expected to be recognized over a weighted average remaining vesting period of 2.6 years. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $1.5 million during the three and six-month periods ended June 30, 2012, of which $0.2 million and $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $1.6 million during the three and six-month periods ended June 30, 2011, of which $0.1 million and $0.3 million, respectively, were capitalized. The expensed amounts are included in general and administrative expense on the Company’s consolidated statement of operations in the respective periods.

The following table summarizes the Company’s restricted share activity for the six-months ended June 30, 2012:

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2012	807,291		$	9.46
Granted	228,777		10.91
Vested	(393,976	)	5.91
Forfeited	(5,806	)	11.32
Non-vested at June 30, 2012	636,286		$	12.61

On March 1, 2012, the Compensation Committee of the Company’s Board of Trustees awarded 194,858 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, be terminated without cause or retire in a qualifying retirement prior to the vesting date. Qualifying retirement for restricted shares granted on March 1, 2012 as provided in the Plan award agreements means the recipient’s voluntary termination of employment after reaching age 57 and accumulating at least 15 years of service with the Company. As of June 30, 2012, none of the Company’s executives had met conditions to elect a qualifying retirement.

Restricted Performance Share Units Plan

On March 1, 2012, March 2, 2011, and March 4, 2010, the Compensation Committee of the Parent Company’s Board of Trustees awarded an aggregate of 262,713, 123,107, and 119,766 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 year measurement period that commenced on January 1, 2012 (in the case of the March 1, 2012 awards), January 1, 2011 (in the case of the March 2, 2011 awards), and January 1, 2010 (in the case of the March 4, 2010 awards) and that ends on the earlier of December 31, 2014, December 31, 2013 or December 31, 2012 (as applicable) or the date of a change of control. In the case of the awards made on March 1, 2012, our 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 our proxy peer group over such period. In the case of the awards made on March 2, 2011 and March 4, 2010, our performance is compared to the total shareholder return of REITs within an index over such respective periods. The awards are also 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” more performance units for the account of the unit holder at the price per common share ending on the dividend payment date. If earned, awards will be settled in common shares in an amount that reflects both the number of performance units 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 return of the REIT within the index or peer group, as applicable.

If the total shareholder return during the measurement period places the Company at or above a certain percentile as compared to the REITs within the index or peer group, as applicable, then at the end of the measurement period the number of shares that will be delivered shall equal a certain percentage (not to exceed 200%) of the participant's base units.

On the date of each grant, the awards were valued using a Monte Carlo simulation. The fair value of the 2012 award on the grant date was $4.2 million, while the fair values of the 2011 and 2010 awards were $2.0 million, respectively. The fair values of each award are being amortized over the three year cliff vesting period. In the case of the 2012 and 2011 awards, the vesting of the

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RPSUs is also subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled, terminated without cause or retire in a qualifying retirement prior to the vesting date. Qualifying retirement for RPSUs granted on March 1, 2012 and March 1, 2011 as provided under the 1997 Plan means the recipient’s voluntary termination of employment after reaching age 57 and accumulating at least 15 years of service with the Company. As of June 30, 2012, none of the Company’s executives has met conditions to elect a qualifying retirement.

For the three and six-month periods ended June 30, 2012, the Company recognized total compensation expense for the 2012, 2011, and 2010 awards of $0.7 million and $1.3 million, of which $0.2 million and $0.4 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the three and six-month periods ended June 30, 2011, the Company recognized total compensation expense for the 2011 and 2010 awards of $0.5 million and $0.8 million, of which $0.1 million and $0.2 million, respectively, were capitalized.

In the case of the Company's previous April 1, 2009 award, a total of 372,102 shares were delivered to award recipients on March 1, 2012. These shares, which all vested on December 31, 2011 (the end of its three-year measurement period), were also paid cash dividends on January 19, 2012.

Employee Share Purchase Plan

On May 9, 2007, the Parent Company’s shareholders approved the 2007 Non-Qualified Employee Share Purchase Plan (the “ESPP”). The ESPP 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 2012 plan year is limited to the lesser of 20% of compensation or $50,000. The number of shares initially reserved for issuance under the ESPP is 1.25 million. During the three and six-month periods ended June 30, 2012, employees made purchases under the ESPP of $0.1 million and $0.2 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and six-month periods ended June 30, 2012. During the three and six-month periods ended June 30, 2011, employees made purchases under the ESPP of $0.1 million and $0.2 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and six-month periods ended June 30, 2011. 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. For the six-month periods ended June 30, 2012 and June 30, 2011, the Company recorded net increases in compensation costs of $0.6 million and $0.4 million, respectively, in connection with the Plan due to the change in the market value of the participant investments in the Plan.

The deferred compensation obligations are unfunded, but the Company has purchased company-owned life insurance policies and 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 each of the six-month periods ended June 30, 2012 and June 30, 2011, the Company recorded net decreases in compensation costs of $0.4 million in connection with the 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 share 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 each of June 30, 2012 and 2011, 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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15. 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. USB agreed to contribute approximately $64.1 million of project costs and advanced $10.2 million of that amount contemporaneously with the closing of the transaction. USB subsequently advanced an additional $27.4 million and $23.8 million in June 2010 and December 2009, respectively. On October 19, 2011, the Company received the remaining $2.7 million of the total contributions upon its completion of certain items and compliance with the federal rehabilitation regulations.

In exchange for its contributions into 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 USB contributions presented within the Company’s consolidated balance sheet amounted to $51.6 million as of June 30, 2012 and December 31, 2011, respectively. The contributions were recorded net of the amount allocated to non-controlling interest as described above of $2.5 million and $2.4 million at the end of the periods ended June 30, 2012 and December 31, 2011, 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 year ended December 31, 2011, the Company recognized $12.0 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 June 30, 2012 and December 31, 2011 is $2.1 million, and is 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 $0.3 million and $0.7 million for the three and six-month periods ended June 30, 2012, respectively, and $0.3 million and $0.7 million for the three and six-month periods ended June 30, 2011, respectively.

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 underserved 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.

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The USB contribution of $13.3 million is included in deferred income on the Company’s consolidated balance sheets at June 30, 2012 and December 31, 2011. 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 June 30, 2012 and December 31, 2011 is $5.3 million and is included in other assets in the Company’s consolidated balance sheet.

16. SEGMENT INFORMATION

As of June 30, 2012, 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, Camden and Mercer 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. The California segment includes properties in Oakland, Concord, Carlsbad and Rancho Bernardo. 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 is as follows (in thousands):

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	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan, D.C.		New Jersey/Delaware		Richmond, Virginia		Austin, Texas		California		Corporate			Total
As of June 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,167,390	$	955,563	$	1,182,895	$	545,241	$	307,932	$	258,924	$	221,102	$	—		$	4,639,047
Construction-in-progress															57,420			57,420
Land inventory															109,564			109,564
As of December 31, 2011:
Real estate investments, at cost:
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
For the three-months ended June 30, 2012:
Total revenue	$	36,934	$	31,911	$	26,967	$	20,287	$	8,902	$	8,188	$	4,831	$	(444	)	$	137,576
Property operating expenses, real estate taxes and third party management expenses	12,711		11,965		10,454		8,932		3,471		3,612		2,488		(329		)	53,304
Net operating income	$	24,223	$	19,946	$	16,513	$	11,355	$	5,431	$	4,576	$	2,343	$	(115	)	$	84,272
For the three-months ended June 30, 2011:
Total revenue	$	37,159	$	30,573	$	30,309	$	19,832	$	9,278	$	7,637	$	4,781	$	(320	)	$	139,249
Property operating expenses, real estate taxes and third party management expenses	12,825		11,203		11,486		9,516		3,614		3,412		2,563		(212		)	54,407
Net operating income	$	24,334	$	19,370	$	18,823	$	10,316	$	5,664	$	4,225	$	2,218	$	(108	)	$	84,842
For the six-months ended June 30, 2012:
Total revenue	$	75,039	$	65,061	$	53,403	$	40,889	$	17,937	$	15,681	$	9,800	$	(823	)	$	276,987
Property operating expenses, real estate taxes and third party management expenses	26,055		24,650		20,520		18,668		7,113		7,009		4,858		(768		)	108,105
Net operating income	$	48,984	$	40,411	$	32,883	$	22,221	$	10,824	$	8,672	$	4,942	$	(55	)	$	168,882
For the six-months ended June 30, 2011:
Total revenue	$	75,136	$	62,423	$	60,640	$	39,811	$	18,076	$	15,749	$	9,584	$	(553	)	$	280,866
Property operating expenses, real estate taxes and third party management expenses	28,617		23,423		23,135		20,603		7,003		6,506		5,004		(545		)	113,746
Net operating income	$	46,519	$	39,000	$	37,505	$	19,208	$	11,073	$	9,243	$	4,580	$	(8	)	$	167,120

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. Below is a reconciliation of consolidated NOI to consolidated net income (loss),

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as defined by GAAP:

	Three-month periods ended June 30,						Six-month periods ended June 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,272		$	84,842		$	168,882		$	167,120
Less:
Interest expense	(32,981		)	(34,738		)	(67,125		)	(67,131		)
Deferred financing costs	(1,261		)	(1,070		)	(2,572		)	(1,998		)
Depreciation and amortization	(49,331		)	(55,710		)	(98,880		)	(105,214		)
Administrative expenses	(6,079		)	(5,890		)	(12,129		)	(12,134		)
Plus:
Interest income	1,841			421			2,324			862
Interest expense - financing obligation	(196		)	—			(378		)	—
Equity in income of real estate ventures	838			1,088			882			2,321
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on early extinguishment of debt	(1,250		)	(756		)	(1,498		)	(756		)
Loss from continuing operations	(4,147		)	(11,813		)	(10,494		)	(14,139		)
Income from discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)

17. 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 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.

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 17 to 91 years. Minimum future rental payments on non-cancelable leases at June 30, 2012 are as follows (in thousands):

2012 (six months remaining)	$	909
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,983

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One of the land leases for a property provides for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the property 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.

The Company acquired ground tenancy rights under a long term ground lease agreement related to its acquisition of an office building in Philadelphia, Pennsylvania on August 12, 2011. The annual rental payments under this ground lease is equal to a percentage of the NOI generated by the property. The Company has not included the amounts in the table above since such amounts are not fixed or determinable.

The Company also acquired ground tenancy rights under a long term ground lease agreement through its acquisition of Three Logan Square on August 5, 2010. The annual rental payment under this ground lease is ten dollars through August 2022 which is when the initial term of the ground lease is scheduled to end. After the initial term, the Company has the option to renew the lease until 2091. The Company also has the option to purchase the land at fair market value after providing a written notice to the owner. The annual rental payment after 2022 will be adjusted at the lower of $3.0 million or the prevailing market rent at that time until 2030. Subsequent to 2030, the annual rental payment will be adjusted at the lower of $4.0 million or the prevailing market rent at the time until 2042 and at fair market value until 2091. The Company believes that based on conditions as of the date the Company acquired its rights under the lease (August 5, 2010), the lease will reset to market after the initial term. Using the estimated fair market rent as of the date of the acquisition over the extended term of the ground lease (assuming the purchase option is not exercised), the future payments will aggregate to $27.4 million. The Company has not included the amounts in the table above since such amounts are not fixed or determinable.

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 June 30, 2012, the Company had a balance of $1.4 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 expects to enter into a settlement agreement with the IRS which will not result in a material tax liability for the Company. Assuming that the settlement agreement is finalized as expected, the contributor of partnership interests in the 2004 transaction has agreed not to assert a claim against the Company under the tax protection agreement entered into as part of the transaction.

As part of the Company’s 2006 merger with Prentiss Properties Trust, 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 for periods up to 15 years from the date of the TRC acquisition as follows at June 30, 2012: 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.

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 will be required to provide the prior owner an opportunity to guaranty a qualifying replacement debt. These debt maintenance agreements may limit the Company’s ability to refinance indebtedness on terms that will be favorable to the Company.

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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.

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 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 remaining compliance periods for its tax credit arrangements runs 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.

18. SUBSEQUENT EVENTS

On July 18, 2012, the Company sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, for a sales price of $52.7 million. These properties, collectively known as the Oaklands Corporate Center, have been classified as held-for-sale within the Company's consolidated financial statements. Please see Note 10 for further discussion.

The Company has evaluated subsequent events through the date the financial statements were issued.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. This Quarterly Report on Form 10-Q and other materials filed by us with 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 the global economic slowdown, 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);

• changes in the economic conditions affecting industries in which our principal tenants compete;

• the unavailability of equity and debt financing;

• 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 losses;

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

• actual or threatened terrorist attacks;

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

• liability under environmental or other laws;

• failure or bankruptcy of real estate venture partners;

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

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• failure of dispositions to close in a timely manner;

• failure of buyers of our properties to comply with the 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;

• complex regulations relating to our status as a REIT and the adverse consequences of the Parent Company's 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 of our 2011 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.

The discussion that follows is based primarily on our consolidated financial statements as of June 30, 2012 and December 31, 2011 and for the three and six-months ended June 30, 2012 and 2011 and should be read along with the consolidated financial statements and related notes appearing elsewhere in this report. The ability to compare one period to another may be significantly affected by acquisitions completed, development properties placed in service and dispositions made during those periods.

OVERVIEW

As of June 30, 2012, our 230 property portfolio consisted of 204 office properties, 20 industrial facilities, five mixed-use properties and one development property that contain an aggregate of approximately 24.9 million net rentable square feet. These 230 properties compose our core portfolio. As of June 30, 2012, we also held economic interests in 18 unconsolidated real estate ventures that we formed with third parties to develop or own commercial properties. The properties owned by these Real Estate Ventures contain approximately 6.5 million net rentable square feet.

As of June 30, 2012, we managed our portfolio within seven geographic segments: (1) Pennsylvania, (2) Philadelphia 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, Camden and Mercer 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. The California segment includes properties in Oakland, Concord, Carlsbad and Rancho Bernardo.

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.

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.

Volatile economic conditions could result in a reduction of the availability of financing and potentially in higher borrowing costs. These factors, coupled with a sluggish economic recovery, have reduced the volume of real estate transactions and created credit stresses on most businesses. Vacancy rates may increase through 2012 and possibly beyond as the current economic climate negatively impacts tenants.

We expect that the impact of the current state of the economy, including high unemployment and the continued volatility in the financial and credit markets, could continue to have a dampening effect on the fundamentals of our business, including potential increases in past due accounts, tenant defaults, lower occupancy and reduced effective rents. These conditions would negatively

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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 seek revenue growth throughout our portfolio by increasing occupancy and rental rates. Occupancy at our wholly owned properties at June 30, 2012 was 86.9%.

The table below summarizes the key operating and leasing statistics of our wholly owned operating properties for the three months ended June 30, 2012:

	Three-month period ended			Six-month period ended
	June 30, 2012			June 30, 2012
Leasing Activity:
Total net rentable square feet owned (1)	24,325,385			24,325,385
Occupancy percentage (end of period)	86.9		%	86.9		%
Average occupancy percentage	86.9		%	86.7		%
New leases and expansions commenced (square feet)	255,250			816,121
Leases renewed (square feet)	345,235			766,618
Net absorption (square feet) (2)	19,957			96,504
Percentage change in rental rates per square feet (3):
New and expansion rental rates	6.6		%	0.8		%
Renewal rental rates	3.7		%	(0.6		)%
Combined rental rates	4.3		%	(0.2		)%
Capital Costs Committed (4):
Leasing commissions (per square feet)	$	7.25		$	5.46
Tenant Improvements (per square feet)	$	25.16		$	18.67

(1) For each period, includes all properties in the core portfolio that were not under development or redevelopment.

(2) Includes leasing related to current developments and redevelopments, and sold properties.

(3) Rental rates include base rent plus reimbursement for operating expenses and real estate taxes.

(4) Calculated on a weighted 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 risk that tenant leases, upon expiration, will not be renewed, that space may not be relet, or that the terms of renewal or reletting (including the cost of renovations) may be less favorable to us than the current lease terms. Leases accounting for approximately 4.8% of our aggregate final annualized base rents as of June 30, 2012 (representing approximately 4.1% of the net rentable square feet of the Properties) expire without penalty in 2012. We maintain an active dialogue with our tenants in an effort to maximize lease renewals. During the six months ended June 30, 2012, we achieved a 68.9% retention rate in our core portfolio. 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 11.4% of total receivables (including accrued rent receivables) as of June 30, 2012 compared to $15.5 million or 11.2% of total receivables (including accrued rent receivables) as of December 31, 2011.

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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.

Development Risk:

As of June 30, 2012, we owned approximately 444 acres of undeveloped land, and held options to purchase approximately 52 additional acres of undeveloped land. As market conditions warrant, we will seek to opportunistically dispose of those parcels that we do not anticipate developing. For parcels of land that we ultimately develop, we will be subject to risks and 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, and insufficient occupancy rates and rental rates. We also entered into development agreements related to two of our land parcels under option for ground lease that require us to commence development by December 31, 2012. If we determine that construction cannot be started by the specified date, or that it is not in our best economic interest to develop either parcel or negotiate an extension of the development period, we will then write off the parcel-specific costs that we have incurred in preparing these parcels of land for development, as we will have lost our rights under the ground lease. These costs, amounting to $7.9 million as of June 30, 2012, would have to be written-off in the period that it is determined that the development would not be commenced.

RECENT PROPERTY TRANSACTIONS

On July 18, 2012, we sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, for a sales price of $52.7 million. These properties, collectively known as the Oaklands Corporate Center, have been classified as held-for-sale within our consolidated financial statements.

On June 22, 2012, we 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. The property was 83.7% occupied as of the sale date.

On March 22, 2012, we 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. The property was 100.0% occupied as of the date of sale.

On January 17, 2012, we 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. The property was 90.1% occupied as of the date of sale.

On January 6, 2012, we 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. We are currently redeveloping this property. We funded the acquisition price through an advance under our Credit Facility and with available corporate funds. We also recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet, consistent with guidance surrounding an asset acquisition.

We continually reassess our portfolio to determine properties that may be in our best interest to sell depending on strategic or economic factors. From time to time, the decision to sell properties in the short term could result in an impairment or other loss being taken by us and such losses could be material to our statement of operations.

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. The preparation of these 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 the disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. 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 accounting policies are reasonably likely to occur from period to period. Management bases its estimates and assumptions on historical experience and current economic conditions. On an on-going basis, management evaluates its estimates and assumptions including those related to revenue, impairment of long-lived assets and the allowance for doubtful accounts. Actual results may differ from those estimates and assumptions.

Our Annual Report on Form 10-K for the year ended December 31, 2011 contains a discussion of our critical accounting policies. There have been no significant changes in our critical accounting policies since December 31, 2011. See also Note 2 in our

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unaudited consolidated financial statements for the three and six-month periods ended June 30, 2012 set forth herein. Management discusses our critical accounting policies and management’s judgments and estimates with our Audit Committee.

RESULTS OF OPERATIONS

The following discussion is based on our Consolidated Financial Statements for the three and six-month periods ended June 30, 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 total revenue less 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 16 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 16 to the Consolidated Financial Statements for a reconciliation of NOI to our consolidated net income (loss).

Comparison of the Three-Month Periods Ended June 30, 2012 and 2011

The table below shows selected operating information for the “Same Store Property Portfolio” and the “Total Portfolio.” The Same Store Property Portfolio consists of 215 properties containing an aggregate of approximately 24.1 million net rentable square feet, and represents properties that we owned for the entire three-month periods ended June 30, 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 June 30, 2012. The Total Portfolio includes the effects of other properties that were either placed into service, acquired or redeveloped after April 1, 2011 or disposed prior to June 30, 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. 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 three-month periods ended June 30, 2012 and 2011) by providing information for the properties which were acquired, placed into service, under development or redevelopment and administrative/elimination information for the three-month periods ended June 30, 2012 and 2011 (in thousands).

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

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Comparison of three-months ended June 30, 2012 to the three-months ended June 30, 2011

	Same Store Property Portfolio									Recently Completed Properties (a)						Development Properties				Other (Eliminations) (b)						Total Portfolio
(dollars in thousands)	2012			2011			Increase/ (Decrease)			2012			2011			2012		2011		2012			2011			2012			2011			Increase/ (Decrease)
Revenue:
Cash rents	$	107,794		$	106,805		$	989		$	680		$	36		$	—	$	—	$	(740	)	$	2,271		$	107,734		$	109,112		$	(1,378	)
Straight-line rents	5,598			4,359			1,239			185			1			—		—		—			114			5,783			4,474			1,309
Above/below market rent amortization	1,361			1,373			(12		)	154			—			—		—		—			36			1,515			1,409			106
Total rents	114,753			112,537			2,216			1,019			37			—		—		(740		)	2,421			115,032			114,995			37
Tenant reimbursements	18,352			18,038			314			150			—			—		—		103			199			18,605			18,237			368
Termination fees	101			1,948			(1,847		)	—			—			—		—		—			—			101			1,948			(1,847		)
Third party management fees, labor reimbursement and leasing	—			—			—			—			—			—		—		2,872			2,733			2,872			2,733			139
Other	941			1,291			(350		)	—			—			—		—		25			45			966			1,336			(370		)
Total revenue	134,147			133,814			333			1,169			37			—		—		2,260			5,398			137,576			139,249			(1,673		)
Property operating expenses	39,942			40,887			(945		)	525			39			—		—		(2,561		)	(1,811		)	37,906			39,115			(1,209		)
Real estate taxes	13,892			13,346			546			30			25			—		—		212			415			14,134			13,786			348
Third party management expenses	—			—			—			—			—			—		—		1,264			1,506			1,264			1,506			(242		)
Net operating income	80,313			79,581			732			614			(27		)	—		—		3,345			5,288			84,272			84,842			(570		)
General & administrative expenses	(4		)	35			(39		)	—			—			—		—		6,083			5,855			6,079			5,890			189
Depreciation and amortization	48,552			53,848			(5,296		)	686			30			—		—		93			1,832			49,331			55,710			(6,379		)
Operating income (loss)	$	31,765		$	25,698		$	6,067		$	(72	)	$	(57	)	$	—	$	—	$	(2,831	)	$	(2,399	)	$	28,862		$	23,242		$	5,620
Number of properties	215			215						3						1				—						219
Square feet	24,083			24,083						243						154				—						24,480
Occupancy %	87.1		%	85.5		%				65.7		%														86.3		%
Other Income (Expense):
Interest income																										1,841			421			1,420
Interest expense																										(32,981		)	(34,738		)	1,757
Deferred financing costs																										(1,261		)	(1,070		)	(191		)
Interest expense — Deferred financing costs																										(196		)	—			(196		)
Equity in income of real estate ventures																										838			1,088			(250		)
Loss on early extinguishment of debt																										(1,250		)	(756		)	(494		)
Loss from continuing operations																										(4,147		)	(11,813		)	7,666
Income from discontinued operations																										10,949			5,579			5,370
Net income (loss)																										$	6,802		$	(6,234	)	$	13,036
Income (loss) per common share																										$	0.01		$	(0.06	)	$	0.07

EXPLANATORY NOTES

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

(b) 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 two properties that were contributed to an unconsolidated real estate venture in which the Company has a 50% ownership interest.

Total Revenue

Cash rents from the Total Portfolio decreased by $1.4 million from the second quarter of 2011 to the second quarter of 2012 primarily reflecting a decrease of $3.0 million of rental income at the other portfolio as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011.

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This decrease was offset by:

• an increase of $1.0 million due to an increase in same store occupancy of 160 basis points from the second quarter of 2011 to the second quarter of 2012;

• an increase of $0.6 million related to the placement into service of the Juniper Street Garage and 660 Allendale Road during the second quarter of 2011, and the acquisition of 3020 Market Street during the third quarter of 2011, and;

• a 150 basis point increase in renewal cash rental rates from the second quarter of 2011 to the second quarter of 2012.

Straight-line rents increased by $1.3 million due to leases with free rent periods that commenced subsequent to the second quarter of 2011 at our same store properties.

Termination fees at our Total Portfolio decreased by $1.8 million due to timing and volume of tenant move-outs during the second quarter of 2012 when compared to the second quarter of 2011.

Property Operating Expenses

Property operating expenses decreased by $1.2 million mainly due to: (i) a $0.9 million decrease related to two properties contributed into one of our unconsolidated joint ventures during the fourth quarter of 2011, (ii) a $0.4 million decrease in repairs and maintenance expenses, (iii) a $0.1 million decrease in bad debt expense, and (iv) a $0.3 million decrease related to payroll expenses during the second quarter of 2012 compared to the second quarter of 2011. The decrease was offset by a $0.5 million increase in property operating expenses for the two properties mentioned above.

Depreciation and Amortization

Depreciation and amortization expense decreased by $6.4 million mainly due to a decrease in the amount of assets written-off related to early terminations of leases during the second quarter of 2012 as compared to the second quarter of 2011. During the second quarter of 2011, we also recorded a $4.7 million of out-of-period depreciation and amortization expense adjustment relating to intangible assets representing tenant relationships and in-place leases that should have been written-off in prior periods.

Interest Income

Interest income increased by $1.4 million primarily due to the recognition of $1.0 million of accrued interest income related to the payoff of the Trenton note receivable during the second quarter of 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 the second quarter of 2012 upon receipt of payment from the borrower. See "Discontinued Operations" section below.

Interest Expense

The decrease in interest expense of $1.6 million is primarily due to the following:

• a decrease of $2.4 million related to our $151.2 million 5.400% Guaranteed Notes that matured and were repaid in full during April 2012;

• a decrease of $1.4 million related to repurchases of various unsecured notes subsequent to the second quarter of 2011, including: (i) $31.3 million of our 7.500% Guaranteed Notes due 2015, (ii) $4.3 million of our $5.400% Guaranteed Notes due 2014, and (iii) $59.9 million of our 3.875% Guaranteed Exchangeable Notes;

• a decrease of $2.2 million in mortgage interest expense which is directly related to the $208.4 million decrease in mortgage indebtedness during 2011;

• a decrease of $0.5 million related to the extinguishment of our Former Term Loan, and;

• a decrease in interest expense of $0.3 million related to an increase in capitalized interest expense.

The decrease of $6.8 million in interest expense described above was offset by the following increases in interest expense during the second quarter 2012 compared to the second quarter of 2011:

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• an increase of $3.1 million as a result of the incurrence of $600.0 million in Term Loans which closed on February 1, 2012;

• an increase of $1.5 million in swap interest expense. We are currently entered into interest rate swap agreements related to all of our variable rate debt with the exception of $100.0 million of term loan indebtedness;

• an increase of $0.2 million related to our issuance of $325.0 million 4.950% Guaranteed Notes due 2018 in April 2011;

• an increase of $0.2 million of financing obligation interest expense related to a property that we contributed to a joint venture in the fourth quarter of 2011 that did not qualify for sale accounting. The interest represents our partner's 50% share of the net operating income of the property, and;

• an increase of $0.2 million in our credit facility fees.

Discontinued Operations

During the three months ended June 30, 2012, we sold one property in Carlsbad, California and classified an additional 11 properties located in Exton, Pennsylvania as held for sale. These properties had total revenues of $2.4 million, property operating expense of $0.8 million, and depreciation and amortization expense of $0.9 million. 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 were 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 $10.2 million.

The June 30, 2011 amounts are reclassified to include the operations of the properties sold through the second quarter of 2012, as well as all properties that were sold through the year ended December 31, 2011. Therefore, the discontinued operations amount for the second quarter of 2011 includes total revenue of $6.4 million, operating expenses of $2.3 million, and depreciation and amortization expense of $2.3 million.

Net income (loss)

Net income (loss) increased by $13.0 million during the three months ended June 30, 2012 compared to the three months ended June 30, 2011 as a result of the factors described above. Net income (loss) 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.

Income (loss) per Common Share

Income per share was $0.01 during the three months ended June 30, 2012 as compared to a loss per share of $0.06 during the three months ended June 30, 2011 as a result of the factors described above.

Comparison of the Six-Month Periods Ended June 30, 2012 and 2011

The table below shows selected operating information for the “Same Store Property Portfolio” and the “Total Portfolio.” The Same Store Property Portfolio consists of 213 properties containing an aggregate of approximately 24.0 million net rentable square feet, and represents properties that we owned for the entire six-month periods ended June 30, 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 June 30, 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 prior to June 30, 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. 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 six-month periods ended June 30, 2012 and 2011) by providing information for the properties which were acquired, placed into service, under development or redevelopment and administrative/elimination information for the six-month periods ended June 30, 2012 and 2011 (in thousands).

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

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Comparison of six-months ended June 30, 2012 to the six-months ended June 30, 2011

	Same Store Property Portfolio									Recently Completed Properties (a)						Development Properties				Other (Eliminations) (b)						Total Portfolio
(dollars in thousands)	2012			2011			Increase/ (Decrease)			2012			2011			2012		2011		2012			2011			2012			2011			Increase/ (Decrease)
Revenue:
Cash rents	$	212,539		$	213,474		$	(935	)	$	2,650		$	706		$	—	$	—	$	(1,474	)	$	4,535		$	213,715		$	218,715		$	(5,000	)
Straight-line rents	12,191			8,735			3,456			410			40			—		—		—			179			12,601			8,954			3,647
Above/below market rent amortization	2,713			2,623			90			242			(33		)	—		—		—			69			2,955			2,659			296
Total rents	227,443			224,832			2,611			3,302			713			—		—		(1,474		)	4,783			229,271			230,328			(1,057		)
Tenant reimbursements	37,144			39,818			(2,674		)	254			29			—		—		215			330			37,613			40,177			(2,564		)
Termination fees	1,591			2,516			(925		)	—			—			—		—		—			—			1,591			2,516			(925		)
Third party management fees, labor reimbursement and leasing	—			—			—			—			—			—		—		6,014			5,486			6,014			5,486			528
Other	2,323			2,003			320			19			—			—		—		156			356			2,498			2,359			139
Total revenue	268,501			269,169			(668		)	3,575			742			—		—		4,911			10,955			276,987			280,866			(3,879		)
Property operating expenses	80,723			86,907			(6,184		)	1,426			311			—		—		(4,786		)	(3,983		)	77,363			83,235			(5,872		)
Real estate taxes	27,679			26,591			1,088			128			88			—		—		421			816			28,228			27,495			733
Third party management expenses	—			—			—			—			—			—		—		2,514			3,016			2,514			3,016			(502		)
Net Operating Income	160,099			155,671			4,428			2,021			343			—		—		6,762			11,106			168,882			167,120			1,762
General & administrative expenses	(19		)	4			(23		)	13			35			—		—		12,135			12,095			12,129			12,134			(5		)
Depreciation and amortization	96,730			101,164			(4,434		)	1,901			328			1		—		249			3,722			98,880			105,214			(6,334		)
Operating Income (loss)	$	63,388		$	54,503		$	8,885		$	107		$	(20	)	$	—	$	—	$	(5,622	)	$	(4,711	)	$	57,873		$	49,772		$	8,101
Number of properties	213			213						5						1				—						219
Square feet	23,957			23,957						369						154				—						24,480
Occupancy %	87.0		%	85.5		%				77.5		%														86.3		%
Other Income (Expense):
Interest income																										2,324			862			1,462
Interest expense																										(67,125		)	(67,131		)	6
Deferred financing costs																										(2,572		)	(1,998		)	(574		)
Interest expense — Deferred financing costs																										(378		)	—			(378		)
Equity in income of real estate ventures																										882			2,321			(1,439		)
Net gain on sale of interests in real estate																										—			2,791			(2,791		)
Loss on early extinguishment of debt																										(1,498		)	(756		)	(742		)
Loss from continuing operations																										$	(10,494	)	$	(14,139	)	$	3,645
Income from discontinued operations																										26,632			7,415			19,217
Net income (loss)																										$	16,138		$	(6,724	)	$	22,862
Loss per common share																										$	0.06		$	(0.08	)	$	0.14

EXPLANATORY NOTES

(a) Results include: Two assets placed in service and three acquired properties.

(b) 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 two properties that were contributed to an unconsolidated real estate venture in which the Company has a 50% ownership interest.

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Total Revenue

Cash rents from the Total Portfolio decreased by $5.0 million from the six-month period ended June 30, 2011 compared to the six-month period ended June 30, 2012 primarily reflecting:

• a decrease of $6.0 million of rental income as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011, and;

• a decrease of $0.9 million at our same store portfolio which is consistent with the 60 basis points decrease in cash rent growth during the six-month period ended June 30, 2012 compared to the six-month period ended June 30, 2011.

These decreases were offset by an increase of $1.9 million related to the placement into service of the Juniper Street Garage and 660 Allendale Road during the second quarter of 2011, and the acquisitions of Overlook I and II and 3020 Market Street during the first quarter and the third quarter of 2011, respectively.

Straight-line rents increased by $3.6 million during the six-month period ended June 30, 2012 compared to the six-month period ended June 30, 2011 due to leases with free rent periods that commenced subsequent to the second quarter of 2011 at our same store properties. In addition, there was a $0.4 million increase related to the acquisitions mentioned above. These increases were offset by a decrease of $0.2 million at the other portfolio as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011.

Tenant reimbursements decreased by $2.6 million during the six-month period ended June 30, 2012 compared to the six-month period ended June 30, 2011 as a direct result of the $5.1 million decrease in operating expenses over the same period.

Termination fees at our Total Portfolio decreased by $0.9 million due to timing and volume of tenant move-outs during the six-month period ended of 2012 when compared to the six-month period ended June 30, 2011.

Property Operating Expenses

Property operating expenses decreased by $5.9 million mainly due to: (i) a $3.1 million decrease related to snow removal costs, (ii) a $1.7 million decrease related to two properties contributed into one of our unconsolidated joint ventures during the fourth quarter of 2011, (iii) a decrease of $0.6 million in contract janitorial and landscaping expenses, (iv) a $1.2 million decrease in utility costs, (v) a $1.1 million decrease in repairs and maintenance expenses, and (vi) a $0.9 million decrease related to payroll expenses during the six-month period ended June 30, 2012 compared to the six-month period ended June 30, 2011. These decreases were offset by a $1.1 million increase in professional fees, a $1.1 million increase in the property operating expenses for the five properties acquired/placed into service, a $0.3 million increase in bad debt expense, and a $0.2 million increase to management expenses during the six-months ended June 30, 2012 compared to the six-months ended June 30, 2011. Snow removal and utility costs decreased as a result of the mild winter experienced in our Pennsylvania and New Jersey sub-markets during the six months ended June 30, 2012. Contract janitorial and landscaping costs decreased as a result of entering into contracts at lower rates than the prior year. Repairs and maintenance expenses decreased based on timing of tenant needs for repairs during the six months ended June 30, 2012. The increase in bad debt expense is directly related to the increase in straight-line rental revenue during the six months ended June 30, 2012 compared to the six months ended June 30, 2011.

Depreciation and Amortization

Depreciation and amortization expense decreased by $6.3 million mainly due to a decrease in the amount of assets written-off related to early terminations of leases during the six-month period ended June 30, 2012 as compared to the six-month period ended June 30, 2011. During the six-month period ended June 30, 2011, we also recorded $4.7 million of out-of-period depreciation and amortization expense adjustment relating to intangible assets representing tenant relationships and in-place leases that should have been written-off in prior periods.

Interest Income

Interest income increased by $1.5 million primarily due to the recognition of $1.0 million of accrued interest income related to the payoff of the Trenton note receivable during the second quarter of 2012. The transaction used the installment sale method as a result of the note receivable and therefore interest income is recognized on a cash basis as a result. We recognized all of the interest income accrued to date during the second quarter of 2012 upon receipt of payment from the borrower. See "Discontinued Operations" section below.

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Discontinued Operations

During the six months ended June 30, 2012, we sold one property located in Moorestown, New Jersey, one property located in Herndon, Virginia and one property located in Carlsbad, California. We classified 11 properties located in Exton, Pennsylvania as held-for-sale as of June 30, 2012. These properties had total revenues of $7.0 million, property operating expenses of $2.4 million, and depreciation and amortization expense of $2.8 million. 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 $24.8 million during the six months ended June 30, 2012.

The June 30, 2011 amounts are reclassified to include the operations of the properties sold through the first six months of 2012, the assets classified as held-for-sale as of June 30, 2012, and all properties that were sold through the year ended December 31, 2011. Therefore, the discontinued operations amount for the six months ended June 30, 2011 includes total revenue of $13.2 million, operating expenses of $5.1 million, and depreciation and amortization expense of $4.5 million.

Net income (loss)

Net income (loss) increased by $10.2 million during six-month period ended June 30, 2012 compared to the six-month period ended June 30, 2011 as a result of the factors described above. Net income (loss) 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.

Income (loss) per Common Share

Income per share was $0.06 during the six-month period ended June 30, 2012 as compared to a loss per share of $0.08 during the six-month period ended June 30, 2011 as a result of the factors described above.

LIQUIDITY AND CAPITAL RESOURCES OF THE PARENT COMPANY

The Parent Company conducts its business through the Operating Partnership and its only material asset is its ownership of the partnership interests of the Operating Partnership. The Parent Company, other than acting as the sole general partner of the Operating Partnership, issues public equity from time to time and guarantees the debt obligations of the Operating Partnership. The Parent Company’s principal funding requirement is the payment of dividends on its common shares and preferred shares. The Parent Company’s source of funding for its dividend payments and other obligations is the distributions it receives from the Operating Partnership.

As of June 30, 2012, the Parent Company owned a 98.2% interest in the Operating Partnership. The remaining interest of approximately 1.8% 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.

As noted above, the Parent Company’s only source of capital (other than proceeds of equity issuances which the Parent Company contributes to the Operating Partnership) is distributions it receives from the Operating Partnership. The Parent Company believes that the Operating Partnership’s sources of working capital, particularly its cash flows from operations and borrowings available under its Credit Facility, are adequate for it to make its distribution payments to the Parent Company, which in turn enables the Parent Company to make dividend payments to its shareholders.

The Parent Company receives proceeds from equity issuances from time to time and contributes such proceeds from its equity issuances to the Operating Partnership in exchange for partnership units 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 its shares. The Parent Company regularly analyzes which source of capital is most advantageous to it at any particular point in time. In March 2010, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell up to an aggregate amount of 15,000,000 common shares until 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 market conditions, the trading price of its common shares 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. During the six-month period ended June 30, 2012, the Parent

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Company did not sell any shares related to the Offering Program. From inception of the Offering Program through June 30, 2012, the Parent Company has sold 6,421,553 shares under the program at an average sales price of $12.50 per share, resulting in 8,578,447 remaining shares available for sale. The Parent Company contributed the net proceeds from the sales to the Operating Partnership, which the Operating Partnership in turn used to repay its debt and for general corporate purposes.

On April 11, 2012, the Parent Company closed a registered public offering of 4,000,000 shares of its 6.90% Series E Cumulative Redeemable Preferred Shares at a price to the public of $25.00 per share. Dividends on the 6.90% Series E Cumulative Redeemable Preferred Shares will be paid quarterly in arrears on or about the 15th day of each January, April, July, and October, commencing July 15, 2012, at a rate per annum of 6.90% of the liquidation value of $25.00 per share (equivalent to $1.725 per share per annum). Net proceeds from the offering totaled approximately $96.3 million, after deducting the underwriting discount and our estimated expenses.

On May 3, 2012, the Parent Company used a portion of the net proceeds from the aforementioned offering of Series E Cumulative Redeemable Preferred Shares to redeem all 2,000,000 shares of its previously outstanding 7.50% Series C Cumulative Redeemable Preferred Shares at a redemption price of $50.0 million plus $0.2 million of accrued dividends through the redemption date. The Company used the remaining proceeds from this offering for corporate purposes. In accordance with GAAP, the Parent Company also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common shares for the three and six-month periods ended June 30, 2012. These costs are shown within the Parent Company's consolidated statements of operations as "Preferred share redemption charge". There were no comparable charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which it paid on July 19, 2012 to its shareholders of record as of July 5, 2012. In addition, the Parent Company declared distributions on its Series D Preferred Shares and Series E Preferred Shares to holders of record as of June 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series D Preferred Shares and Series E Preferred Shares totaled $1.1 million and $1.8 million, respectively.

The Parent Company also maintains a share repurchase program under which its Board of Trustees has authorized the Parent Company to repurchase its common shares from time to time. As of June 30, 2012, there were approximately 0.5 million shares remaining to be repurchased under this program. The Parent Company did not repurchase any shares during the three-month period ended June 30, 2012. The Parent Company’s Board of Trustees has not limited the duration of the program, however, it may be terminated at any time.

Together with the Operating Partnership, the Parent Company maintains a shelf registration statement that registered 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, the Parent Company and the Operating Partnership may offer and sell equity and debt securities from time to time under the shelf registration statement.

The Parent Company unconditionally guarantees the Operating Partnership’s secured and unsecured obligations, which, as of June 30, 2012, amounted to $506.4 million and $2,009.2 million, respectively. If the Operating Partnership fails to comply with its debt requirements, the Parent Company will be required to fulfill the Operating Partnership’s commitments under such guarantees. As of June 30, 2012, the Operating Partnership is in compliance with all of its debt covenant and requirement obligations.

In order to maintain its 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. The Parent Company has historically satisfied this requirement.

Overall, the liquidity of the Parent Company is dependent on the Operating Partnership’s ability to make distributions to the Parent Company. However, there can be no assurance that the Operating Partnership’s sources of capital will continue to be available to meet its working capital needs including its ability to make distribution payments to the Parent Company. In cases where the Operating Partnership is faced with working capital problems or would need to raise capital to fund acquisitions and developments, the Parent Company will have to consider alternative sources to increase liquidity, including, among other things, equity issuances through its existing Offering Program, use of its available line of credit and potential sale of properties.

LIQUIDITY AND CAPITAL RESOURCES OF THE OPERATING PARTNERSHIP

General

The Operating Partnership’s principal liquidity needs for the next twelve months are as follows:

• fund normal recurring expenses,

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• 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 the Parent Company.

The Operating Partnership believes that 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 its markets throughout 2012 and possibly beyond. As a result, the Operating Partnership’s revenue from the overall reduced demand for office space, and its cash flow could be insufficient to cover increased tenant installation costs over the short-term. If this situation were to occur, the Operating Partnership expects that it would finance cash deficits through borrowings under the Credit Facility and other debt and equity financings.

The Operating Partnership believes that its 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 its principal sources of cash that it uses to pay operating expenses, debt service, recurring capital expenditures and the minimum distributions required to maintain its REIT qualification. The Operating Partnership seeks to increase cash flows from its properties by maintaining quality standards for its properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. The Operating Partnership’s revenue also includes third-party fees generated by its property management, leasing, development and construction businesses. The Operating Partnership believes that its revenue, together with proceeds from property sales and debt financings, will continue to provide funds for its short-term liquidity needs. However, material changes in its operating or financing activities may adversely affect its net cash flows. Such changes, in turn, would adversely affect its ability to fund distributions to the Parent Company, debt service payments and tenant improvements. In addition, a material adverse change in cash provided by operations would affect the financial performance covenants under its Credit Facility, unsecured term loan and unsecured notes.

Financial markets have experienced unusual volatility and uncertainty. The Operating Partnership’s ability to fund development projects, as well as its ability to repay or refinance debt maturities could be adversely affected by its inability to secure financing at reasonable terms beyond those already completed. It is possible, in these unusual and uncertain times that one or more lenders in its Credit Facility could fail to fund a borrowing request. Such an event could adversely affect its ability to access funds from its Credit Facility when needed.

The Operating Partnership’s liquidity management remains a priority. The Operating Partnership regularly pursues new financing opportunities to ensure an appropriate balance sheet position. As a result of these dedicated efforts, the Operating Partnership is comfortable with its ability to meet future debt maturities and development or property acquisition funding needs. The Operating Partnership believes that its current balance sheet is in an adequate position at the date of this filing, despite the volatility in the credit and financial markets. On February 1, 2012, the Parent Company and the Operating Partnership closed on a new $600.0 million four-year unsecured credit facility and three unsecured term loans in the aggregate amount of $600.0 million, consisting of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. The new credit facility and term loans are referred to earlier in this Form 10-Q as our "New Credit Facility" and "New Term Loans", respectively, and the Parent Company used the proceeds from the initial advances under the New Term Loans to repay all balances outstanding under, and concurrently terminate, the Former Revolving Credit Facility and Former Term Loan. The New Credit Facility has terms that are generally comparable to those under the Former Revolving Credit Facility.

The Operating Partnership uses multiple financing sources to fund its long-term capital needs. When needed, it will use its New Credit Facility for general business purposes, including the acquisition, development and redevelopment of properties and the repayment of other debt. It will also consider other properties within its portfolio as necessary, where it may be in its best interest to obtain a secured mortgage.

The Operating Partnership’s ability to incur additional debt is dependent upon a number of factors, including its credit ratings, the value of its unencumbered assets, its degree of leverage and borrowing restrictions imposed by its current lenders. If more than one rating agency were to downgrade its credit rating, the Operating Partnership's access to capital in the unsecured debt market would be more limited and the interest rate under its New Credit Facility and the New Term Loans would increase.

The ability of the Parent Company and the Operating Partnership to sell their equity securities is dependent on, among other things, general market conditions for REITs, market perceptions about the Company and the current trading price of the Parent Company’s shares. The Parent Company contributes the proceeds it receives from its equity issuances to the Operating Partnership in exchange for partnership units of the Operating Partnership in accordance with the Operating Partnership’s partnership agreement. The Operating Partnership uses the net proceeds from the sales contributed by the Parent Company to repay its debt and for general

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corporate purposes. The Operating Partnership, from time to time, also issues its own partnership units as consideration for property acquisitions and developments.

The Operating Partnership will also consider sales of selected Properties as another vehicle for managing its liquidity. Asset sales have been a source of cash for the Operating Partnership. The Operating Partnership has used proceeds from asset sales to repay existing indebtedness, provide capital for its development activities and strengthen its financial condition. There is no guarantee that it will be able to raise similar or even lesser amounts of capital from future asset sales.

Cash Flows

The following discussion of the Operating Partnership’s cash flows is based on the consolidated statement of cash flows and is not meant to be a comprehensive discussion of the changes in our cash flows for the periods presented.

As of June 30, 2012 and December 31, 2011, the Operating Partnership maintained cash and cash equivalents of $190.1 million and $0.4 million, respectively. The following are the changes in cash flow from its activities for the six-month periods ended June 30 (in thousands):

Activity	2012		2011
Operating	$	75,621	$	88,342
Investing	9,988		(97,253		)
Financing	104,036		(6,921		)
Net cash flows	$	189,645	$	(15,832	)

The Operating Partnership’s principal source of cash flows is from the operation of its properties. The Operating Partnership does not restate its cash flow for discontinued operations.

The net decrease of $12.7 million in cash from operating activities of the Operating Partnership during the six months ended June 30, 2012 compared to the six months ended June 30, 2011 is primarily attributable to the following:

• decrease in the number of operating properties due to dispositions. The Operating Partnership sold a total of six properties subsequent to June 30, 2011.

• timing of cash receipts and cash expenditures in the normal course of operations.

The net increase of $107.2 million in cash from investing activities of the Operating Partnership during the six months ended June 30, 2012 compared to the six months ended June 30, 2011 is primarily attributable to the following:

• an increase of $115.3 million of net proceeds from three property sales during the first six months of 2012. There was one property sale during the first six months of 2011 (see Note 3 to the consolidated financial statements for details);

• An increase of $56.3 million related to proceeds from the sale of available-for sale securities during the first six months of 2012. There were no comparable sales during the first six months of 2011;

• an increase of $23.9 million related to proceeds received in connection with the repayment of two mortgage notes receivable during the six months ended June 30, 2012. There were no comparable mortgage notes receivable repayments during the first six months of 2011;

• a decrease in capital expenditures for tenant and building improvements and leasing commissions by $15.8 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011. The decrease in capital expenditures during the first six months of 2012 is mainly attributable to Juniper Street Parking Garage being placed into service during the second quarter of 2011. This property was under development during the first quarter of 2011;

• a decrease of $12.8 million in funds used to acquire operating properties, mainly attributable to the Operating Partnership acquiring Overlook I and II during 2011, compared to the acquisition of the 660 West Germantown Pike development property during 2012;

• a decrease of $1.0 million attributable to a loan provided to an unconsolidated Real Estate Venture partner during 2011 with no comparable loans provided to unconsolidated real estate ventures during 2012, and;

• a decrease in advances made for purchase of tenant assets, net of repayments of $0.7 million during the six months ended June 30, 2012 when compared to the six months ended June 30, 2011.

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

• an increase of $98.7 million related to available-for-sale securities that were purchased during the first six months of 2012. There were no comparable purchases for the first six months of 2011;

• an increase of $18.6 million of investments in unconsolidated Real Estate Ventures during the first six months of 2012, primarily reflecting $12.0 million that was contributed to a venture to repay our share of its mortgage indebtedness, and;

• a decrease in cash distributions from unconsolidated Real Estate Ventures of $1.3 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011.

The net increase of $111.0 million in cash from financing activities of the Operating Partnership during the six months ended June 30, 2012 compared to the six months ended June 30, 2011 is mainly due to the following:

• an increase in proceeds from New Term Loans of $600.0 million during the six months ended June 30, 2012 with no comparable term loan funding during the six months ended June 30, 2011;

• a decrease in repayments of the Credit Facility and mortgage notes payable of $141.7 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011;

• a increase in net proceeds received from the issuance of common and preferred shares of the Parent Company of $88.2 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011;

• an increase of the net settlement of hedge transactions amounting to $0.5 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011, and;

• deferred financing obligations of $0.5 million during the six months ended June 30, 2012, with no comparable amount during the six months ended June 30, 2011.

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

• a decrease in proceeds from the Credit Facility and unsecured notes of $481.5 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011;

• an increase in the repayment of unsecured notes of $143.4 million during the six months ended 2012 compared to the six months ended 2011;

• redemption of our 7.50% Series C Preferred Shares in the amount of $50.2 million during the six months ended June 30, 2012, with no comparable charges for the six months ended June 30, 2011;

• repayment of an unsecured term loan of $37.5 million during 2012;

• an increase in debt financing costs of $4.8 million during the six months ended June 30, 2012 compared to the six months ended June 30, 2011;

• a decrease in the exercise of stock options of $0.1 million for the six months ended June 30, 2012 compared to the six months ended June 30, 2011, and;

• an increase in distributions paid by the Parent Company to its shareholders and on non-controlling interests from $45.5 million during the six months ended June 30, 2011 to $47.9 million during the six months ended June 30, 2012.

Capitalization

Indebtedness

During the six-months ended June 30, 2012, we repurchased $14.7 million of our outstanding unsecured Notes in a series of transactions which are summarized in the table below (in thousands):

Notes	Repurchase Amount		Principal		Loss			Deferred Financing Amortization
2012 5.750% Notes	$	309	$	301	$	(2	)	$	—
2014 5.400% Notes	4,630		4,302		(264		)	7
2015 7.500% Notes	11,537		10,090		(1,233		)	9
	$	16,476	$	14,693	$	(1,499	)	$	16

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The table below summarizes the Operating Partnership’s indebtedness under its mortgage notes payable, its unsecured notes and its Credit Facility at June 30, 2012 and December 31, 2011:

	June 30, 2012			December 31, 2011
	(dollars in thousands)
Balance:
Fixed rate	$	2,415,591		$	2,061,728
Variable rate — unhedged	100,000			338,774
Total	$	2,515,591		$	2,400,502
Percent of Total Debt:
Fixed rate	96.0		%	85.9		%
Variable rate — unhedged	4.0		%	14.1		%
Total	100		%	100		%
Weighted-average interest rate at period end:
Fixed rate	5.4		%	6.0		%
Variable rate — unhedged	2.0		%	1.1		%
Total	5.3		%	5.3		%

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

The Operating Partnership will use New Credit Facility borrowings for general business purposes, including the acquisition, development and redevelopment of properties and the repayment of other debt. It has the option to increase the maximum borrowings under the New Credit Facility to $800.0 million subject to the absence of any defaults and its ability to obtain additional commitments from its existing or new lenders. The New Credit Facility requires the maintenance of financial covenants, including ratios related to minimum net worth, debt to total capitalization and fixed charge coverage and customary non-financial covenants. The Operating Partnership is in compliance with all covenants as of June 30, 2012.

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 June 30, 2012.

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.

As of June 30, 2012, the Operating Partnership had guaranteed repayment of approximately $0.7 million of loans on behalf of one Real Estate Venture. The Operating Partnership also provides customary environmental indemnities and completion guarantees in connection with construction and permanent financing both for its own account and on behalf of certain of the Real Estate Ventures.

Equity

On April 11, 2012, the Operating Partnership issued 6.90% Series E-Linked Preferred Mirror Units, in connection with the previously mentioned Series E Preferred Share Offering. On May 3, 2012, the Operating Partnership also redeemed all of its Series D Preferred Mirror Units as a result of the aforementioned redemption of Series C Preferred Shares. In accordance with GAAP, the Operating Partnership also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common units for the three and six-month periods ended June 30, 2012. These costs are shown within the Operating Partnership's consolidated statements of operations as "Preferred unit redemption charge". There were no comparable

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charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on July 19, 2012 to unitholders of record as of July 5, 2012.

On May 31, 2012, the Operating Partnership declared distributions on its Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units to holders of record as of June 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units totaled $1.1 million and $1.8 million, respectively.

During the six-month period ended June 30, 2012, the Parent Company did not sell any shares under the Offering Program. During the six-month period ended June 30, 2012, the Parent Company did not repurchase any shares under its share repurchase program, and accordingly, the Operating Partnership did not repurchase any units in connection with the Parent Company's share repurchase program. From the inception of the Offering Program in March 2010 through June 30, 2012, the Operating Partnership has issued an aggregate of 6,421,553 common partnership units to the Parent Company. The Operating Partnership has used the net proceeds from such sales to repay balances on its unsecured revolving Credit Facility and for general corporate purposes.

Together with the Operating Partnership, the Parent Company maintains a shelf registration statement that registered common shares, preferred shares, depositary shares, warrants and unsecured debt securities. Subject to the Company’s ongoing compliance with securities laws, if warranted by market conditions, the Parent Company and the Operating Partnership may offer and sell equity and debt securities from time to time under the shelf registration statement.

Short- and Long-Term Liquidity

The Operating Partnership believes that its available cash balances and cash flow from operations are adequate to fund its short-term liquidity requirements, excluding principal payments under its debt obligations. Cash flow from operations is generated primarily from rental revenues and operating expense reimbursements from tenants and management services income from providing services to third parties. The Operating Partnership intends to use these funds to meet short-term liquidity needs, which are to fund operating expenses, recurring capital expenditures, tenant allowances, leasing commissions, interest expense and the minimum distributions required to maintain the Parent Company’s REIT qualification under the Internal Revenue Code. The Operating Partnership expects to meet short-term scheduled debt maturities through borrowings under the Credit Facility and proceeds from potential asset dispositions. As of June 30, 2012, the Operating Partnership had $2,009.2 million of total unsecured debt and $506.4 million of mortgage debt with $6.4 million of mortgage principal payments scheduled to be repaid through December 31, 2012. The Company closed on the New Credit Facility and New Term Loans on February 1, 2012 and used the initial advances under the New Term Loans to repay all balances outstanding under, and concurrently terminate, its Former Revolving Credit Facility and the Former Term Loan, both of which were scheduled to mature on June 29, 2012.

On March 23, 2012, the Operating Partnership acquired a $50.0 million tranche of Banco Santander Chile Senior Notes, with $0.2 million premium paid for the debt securities and $0.5 million of accrued interest income. On the acquisition date, the bonds were designated by the Operating Partnership as held-to-maturity securities, based upon the nature of the transaction, the Operating Partnership's intention and ability to hold the securities to maturity, and other applicable guidance surrounding prepayment risk, liquidity needs, yield on alternative investments and other factors associated with the accounting standard for certain investments in debt and equity securities. The securities earn interest income at a rate of 2.875% annually, and are scheduled to mature on November 13, 2012. During the second quarter of 2012, the Operating Partnership sold $20.0 million of the aforementioned securities, recognizing a nominal loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Operating Partnership's best interest.

Subsequent to the above transaction, the Operating Partnership also transferred its entire remaining portfolio of held-to-maturity securities, as well as any investments made during the second quarter of 2012, to a designation of available-for-sale, consistent with the requirements of the accounting standard for the classification of debt and equity securities.

The Operating Partnership expects to meet its long-term liquidity requirements, such as for property acquisitions, development, investments in real estate ventures, scheduled debt maturities, major renovations, expansions and other significant capital improvements, through cash from operations, borrowings under the Credit Facility, additional secured and unsecured indebtedness, the issuance of equity securities, contributions from joint venture investors and proceeds from asset dispositions.

Inflation

A majority of the Operating Partnership’s 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 its office leases provide for fixed base rent increases. The

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Operating Partnership believes 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 the Operating Partnership’s contractual commitments as of June 30, 2012:

	Payments by Period (in thousands)
	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
Mortgage notes payable (a)	$	506,363	$	67,246	$	24,607	$	215,706	$	198,804
Unsecured term loan	600,000		—		150,000		250,000		200,000
Unsecured debt (a)	1,409,228		—		455,618		875,000		78,610
Ground leases (b)	297,346		909		5,545		5,727		285,165
Development contracts (c)	10		10		—		—		—
Interest expense (d)	529,520		108,488		196,217		122,346		102,469
Other liabilities (e)	11,877		—		—		—		11,877
	$	3,354,344	$	176,653	$	831,987	$	1,468,779	$	876,925

(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 above does not include the future minimum annual rental payments related to the ground lease that we assumed in connection with our acquisition of Three Logan Square as the amounts cannot be determined at this time. The table also does not include the future minimum rental payments related to the ground lease in connection with our acquisition of an office building in Philadelphia, Pennsylvania. Both of these ground leases are discussed below.

(c) Represents contractual obligations for development projects and does not contemplate all costs expected to be incurred for such developments.

(d) Variable rate debt future interest expense commitments are calculated using June 30, 2012 interest rates.

(e) Other liabilities consists of deferred compensation liability and existing interest accretion on Two Logan Square (see related discussion below), as of June 30, 2012.

The Operating Partnership obtained ground tenancy rights under a long term ground lease agreement when it acquired Three Logan Square on August 5, 2010. The annual rental payment under this ground lease is ten dollars through August 2022, which is when the initial term of the ground lease will end. After the initial term, the Operating Partnership has various options to renew the lease until 2091. The Operating Partnership also obtained the option to purchase the land at fair market value after providing a written notice to the owner. The annual rental payment after 2022 will be adjusted at the lower of $3.0 million or the prevailing market rent at that time until 2030. Subsequent to 2030, the annual rental payment will be adjusted at the lower of $4.0 million or the prevailing market rent at that time until 2042 and at fair market value until 2091. The Operating Partnership believes that based on conditions as of the date the lease was assigned (August 5, 2010), the lease will reset to market after the initial term. Using the estimated fair market rent as of the date of the acquisition over the extended term of the ground lease (assuming the purchase option is not exercised), the future payments will aggregate $27.4 million. The Operating Partnership has not included the amounts in the table above since such amounts are not fixed and determinable.

The Operating Partnership also acquired ground tenancy rights under a long term ground lease agreement related to its acquisition of an office building in Philadelphia, Pennsylvania on August 12, 2011. The annual rental payments under this ground lease are equal to a percentage of the NOI generated by the property. The Company has not included the amounts in the table above since such amounts are not fixed or determinable.

As part of the Operating Partnership’s September 2004 acquisition of a portfolio of properties from the Rubenstein Company (which the Operating Partnership refers 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

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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 June 30, 2012, the Operating Partnership has a balance of $1.4 million for this liability on its consolidated balance sheet.

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 expects to enter into a settlement agreement with the IRS which will not result in a material tax liability for the Operating Partnership. Assuming that the settlement agreement is finalized as expected, 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 of the Operating Partnership’s 2006 Prentiss merger, the 2004 TRC acquisition and several of its other transactions, it 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 Operating Partnership agreed not to sell acquired properties for periods up to 15 years from the date of the TRC acquisition as follows at June 30, 2012: 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 Operating Partnership assumed the obligation of Prentiss not to sell Concord Airport Plaza before March, 2018. The Operating Partnership’s 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 the Operating Partnership was to sell a restricted property before expiration of the restricted period in a non-exempt transaction, it would be required to make significant payments to the parties who sold the applicable property to the Operating Partnership for tax liabilities triggered to them.

As part of the Operating Partnership’s acquisition of properties from time to time in tax-deferred transactions, it has agreed to provide certain of the prior owners of the acquired properties with the right to guarantee its indebtedness. If the Operating Partnership were to seek to repay the indebtedness guaranteed by the prior owner before the expiration of the applicable agreement, it will be required to provide the prior owner an opportunity to guarantee a qualifying replacement debt. These debt maintenance agreements may limit its ability to refinance indebtedness on terms that will be favorable to the Operating Partnership.

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 USB 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.

The Operating Partnership entered into development agreements related to two parcels of land under option for ground lease that require the Operating Partnership to commence development by December 31, 2012. If the Operating Partnership determines that construction cannot be started by the specified date, or that it is not in the Operating Partnership's best economic interest to develop either parcel or negotiate an extension of the development period, it will then write off the parcel-specific costs that it has incurred in preparing these parcels of land for development, as it will have lost its rights under the ground lease. These costs, amounting to $7.9 million as of June 30, 2012, would have to be written-off in the period that it is determined that the development would not be commenced and an extension cannot be negotiated.

The Operating Partnership invests in properties and regularly incurs capital expenditures in the ordinary course of its business to maintain the properties. The Operating Partnership believes that such expenditures enhance its competitiveness. The Operating Partnership also enters 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.

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.

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The Operating Partnership’s financial instruments consist of both fixed and variable rate debt. As of June 30, 2012, its consolidated debt consisted of $506.4 million of mortgage loans and $1,330.6 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 $600.0 million of unsecured term loans all of which are swapped to fixed, except for $100.0 million of unsecured term loans which bear interest a variable rate of interest. 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 the Operating Partnership’s outstanding fixed-rate mortgage debt would decrease by approximately $28.4 million. If market rates of interest decrease by 100 basis points, the fair value of its outstanding fixed-rate mortgage debt would increase by approximately $31.1 million.

As of June 30, 2012, based on prevailing interest rates and credit spreads, the fair value of the Operating Partnership’s $1,330.6 million of unsecured notes was $1,411.5 million. For sensitivity purposes, a 100 basis point change in the discount rate equates to a change in the total fair value of the Operating Partnership’s debt of approximately $13.3 million at June 30, 2012.

From time to time or as the need arises, the Operating Partnership uses derivative instruments to manage interest rate risk exposures and not for speculative purposes. The total carrying value of the Operating Partnership’s variable rate debt (including variable swapped to fixed) was approximately $678.6 million and $391.6 million at June 30, 2012 and December 31, 2011, respectively. The total fair value of the Operating Partnership’s debt was approximately $676.7 million and $380.8 million at June 30, 2012 and December 31, 2011, respectively. For sensitivity purposes, a if market rates of interest increase by 100 basis points the fair value of its variable rate debt would decrease by approximately $8.6 million at June 30, 2012. If market rates of interest decrease by 100 basis points the fair value of its outstanding variable rate debt would increase by approximately $4.9 million. A 100 basis point change in the market rate of interest equates to a change in the total fair value of its debt of approximately $3.4 million at December 31, 2011.

At June 30, 2012, the Operating Partnership’s outstanding variable rate debt based on LIBOR totaled approximately $678.6 million, of which $100.0 million remained variable, with the remaining $578.6 million being swapped to fixed. At June 30, 2012, the interest rate on the Operating Partnership's variable rate debt was approximately 2.0%. If market interest rates on its variable rate debt were to change by 100 basis points, total interest expense would have changed by approximately $0.3 million for the quarter ended June 30, 2012.

These amounts were determined solely by considering the impact of hypothetical interest rates on the Operating Partnership’s 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 its 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 joint 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.

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

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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 three and six-month periods ended June 30, 2012 and 2011:

	Three-month periods ended						Six-month periods ended
	June 30,						June 30,
	2012			2011			2012			2011
	(amounts in thousands, except share information)
Net income (loss) attributable to common unitholders	$	1,568		$	(8,353	)	$	8,810		$	(10,983	)
Add (deduct):
Amount allocated to unvested restricted unitholders	95			121			191			263
Net gain on sale of interests in real estate	—			—			—			(2,791		)
Net gain on disposition of discontinued operations	(10,166		)	(3,836		)	(24,834		)	(3,836		)
Depreciation and amortization:
Real property — continuing operations	38,972			43,079			77,559			80,344
Leasing costs including acquired intangibles — continuing operations	10,307			12,385			21,163			24,320
Real property — discontinued operations	770			2,280			2,525			4,434
Leasing costs including acquired intangibles — discontinued operations	70			64			219			127
Company’s share of unconsolidated real estate ventures	3,167			2,044			6,557			4,425
Funds from operations	$	44,783		$	47,784		$	92,190		$	96,303
Funds from operations allocable to unvested restricted shareholders	(197		)	(284		)	(515		)	(624		)
Funds from operations available to common share and unit holders (FFO)	$	44,586		$	47,500		$	91,675		$	95,679
Weighted-average shares/units outstanding — fully diluted	146,545,858			146,607,153			146,184,051			146,218,104

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market risk is the exposure to loss resulting from changes in interest rates, commodity prices and equity prices. In pursuing the Company’s business plan, the primary market risk to which it is exposed is interest rate risk. Changes in the general level of interest rates prevailing in the financial markets may affect the spread between the Company’s yield on invested assets and cost of funds and, in turn, the Company’s ability to make distributions or payments to its shareholders. While the Company has not experienced any significant credit losses, in the event of a significant rising interest rate environment and/or economic downturn, defaults could increase and result in losses to the Company which would adversely affect its operating results and liquidity.

See “Interest Rate Risk and Sensitivity Analysis” in Item 2 above.

Item 4. Controls and Procedures

Controls and Procedures (Parent Company)

(a) Evaluation of disclosure controls and procedures. Under the supervision and with the participation of its management, including its principal executive officer and principal financial officer, the Parent Company 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), as of the end of the period covered by this quarterly report. Based on this evaluation, the Parent Company’s principal executive officer and principal financial officer have concluded that the Parent Company’s disclosure controls and procedures are effective as of the end of the period covered by this quarterly report.

(b) Changes in internal controls over financial reporting. There was no change in the Parent Company’s internal control over financial reporting that occurred during the period covered by this quarterly report that has materially affected, or is reasonably likely to materially affect, the Parent Company’s internal control over financial reporting.

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Controls and Procedures (Operating Partnership)

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

(b) Changes in internal controls over financial reporting. There was no change in the Operating Partnership’s internal control over financial reporting that occurred during the period covered by this quarterly report that has materially affected, or is reasonably likely to materially affect, the Operating Partnership’s internal control over financial reporting.

Part II. OTHER INFORMATION

Item 1. Legal Proceedings

None.

Item 1A. Risk Factors

There has been no material change to the risk factors previously disclosed by us in our Annual Report on Form 10-K for the fiscal year ended December 31, 2011.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table summarizes the share repurchases during the six-month period ended June 30, 2012:

	Total Number of Shares Purchased	Average Price Paid Per Share		Purchased as Part of Publicly Announced Plans or Programs	Shares that May Yet Be Purchased Under the Plans or Programs (a)
2012:
January	3,817	$	9.66	—	539,200
February	—	—		—	539,200
March	146,822	$	11.04	—	539,200
April	104,671	$	11.48	—	539,200
May	—	—		—	539,200
June	—	—		—	539,200
Total	255,310			—

(a) Relates to the remaining share repurchase availability under the Parent Company’s share repurchase program. There is no expiration date on the share repurchase program. The Parent Company’s Board of Trustees initially authorized this program in 1998 and has periodically replenished capacity under the program.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

67

Item 6. Exhibits

(a) Exhibits

3.1	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust, dated as of April 6, 2012 (incorporated by reference to Exhibit 3.1.10 to Brandywine Realty Trust's Form 8-A filed on April 6, 2012)
3.2	Seventeenth Amendment to Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P., dated as of April 11, 2012 (incorporated by reference to Exhibit 3.2 to Brandywine Realty Trust's Current Report on Form 8-K filed on April 11, 2012)
4.1	Form of 6.90% Series E Cumulative Redeemable Preferred Shares Certificate (incorporated by reference to Exhibit 4.1 to Brandywine Realty Trust's Form 8-A filed on April 6, 2012)
4.2	Form of Series E-Linked Preferred Mirror Units (incorporated by reference to Exhibit 4.2 to Brandywine Realty Trust's Current Report on Form 8-K filed on April 11, 2012)
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
101.1	The following materials from the Quarterly Reports on Form 10-Q of Brandywine Realty Trust and Brandywine Operating Partnership, L.P. for the quarter ended June 30, 2012 formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statement of Equity, (iv) the Consolidated Statements of Cash Flows, and (v) Notes to Consolidated Financial Statements, detailed tagged and filed herewith.

68

SIGNATURES OF REGISTRANT

Pursuant to the requirements 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 (Registrant)
Date:	August 3, 2012	By:	/s/ Gerard H. Sweeney
			Gerard H. Sweeney, President and Chief Executive Officer
			(Principal Executive Officer)
Date:	August 3, 2012	By:	/s/ Howard M. Sipzner
			Howard M. Sipzner, Executive Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	August 3, 2012	By:	/s/ Gabriel J. Mainardi
			Gabriel J. Mainardi, Vice President and Chief Accounting Officer
			(Principal Accounting Officer)

69

SIGNATURES OF REGISTRANT

Pursuant to the requirements 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. (Registrant) BRANDYWINE REALTY TRUST, as general partner
Date:	August 3, 2012	By:	/s/ Gerard H. Sweeney
			Gerard H. Sweeney, President and Chief Executive Officer
			(Principal Executive Officer)
Date:	August 3, 2012	By:	/s/ Howard M. Sipzner
			Howard M. Sipzner, Executive Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	August 3, 2012	By:	/s/ Gabriel J. Mainardi
			Gabriel J. Mainardi, Vice President and Chief Accounting Officer
			(Principal Accounting Officer)

70

Index to Exhibits

3.1	Articles Supplementary to Declaration of Trust of Brandywine Realty Trust, dated as of April 6, 2012 (incorporated by reference to Exhibit 3.1.10 to Brandywine Realty Trust's Form 8-A filed on April 6, 2012)
3.2	Seventeenth Amendment to Amended and Restated Agreement of Limited Partnership of Brandywine Operating Partnership, L.P., dated as of April 11, 2012 (incorporated by reference to Exhibit 3.2 to Brandywine Realty Trust's Current Report on Form 8-K filed on April 11, 2012)
4.1	Form of 6.90% Series E Cumulative Redeemable Preferred Shares Certificate (incorporated by reference to Exhibit 4.1 to Brandywine Realty Trust's Form 8-A filed on April 6, 2012)
4.2	Form of Series E-Linked Preferred Mirror Units (incorporated by reference to Exhibit 4.2 to Brandywine Realty Trust's Current Report on Form 8-K filed on April 11, 2012)
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
101.1	The following materials from the Quarterly Reports on Form 10-Q of Brandywine Realty Trust and Brandywine Operating Partnership, L.P. for the quarter ended June 30, 2012 formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statement of Equity, (iv) the Consolidated Statements of Cash Flows, and (v) Notes to Consolidated Financial Statements, detailed tagged and filed herewith.

71

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 quarterly report on Form 10-Q 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 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 3, 2012	/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 quarterly report on Form 10-Q 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 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 3, 2012	/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 quarterly report on Form 10-Q 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 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 3, 2012	/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 quarterly report on Form 10-Q 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 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 3, 2012	/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 Quarterly Report of Brandywine Realty Trust (the “Company”) on Form 10-Q for the quarter ended June 30, 2012 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:	August 3, 2012

* 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 Quarterly Report of Brandywine Realty Trust (the “Company”) on Form 10-Q for the quarter ended June 30, 2012 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 resuof operations of the Company.

/s/ Howard M. Sipzner
Howard M. Sipzner
Executive Vice President and Chief Financial Officer
Date:	August 3, 2012

* 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 Quarterly Report of Brandywine Operating Partnership, L.P. (the “Partnership”) on Form 10-Q for the quarter ended June 30, 2012 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 result of operations of the Company.

/s/ Gerard H. Sweeney
Gerard H. Sweeney
President and Chief Executive Officer
Date:	August 3, 2012

* 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 Quarterly Report of Brandywine Operating Partnership, L.P. (the “Partnership”)on Form 10-Q for the quarter ended June 30, 2012 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 result of operations of the Company.

/s/ Howard M. Sipzner
Howard M. Sipzner
Executive Vice President and Chief Financial Officer
Date:	August 3, 2012

* 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.

XML

Partners Equity of The Operating Partnership (Tables)

6 Months Ended

Jun. 30, 2012

Equity [Abstract]

Earnings per Common Partnership Unit

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following table details 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):

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(9,381		)	(9,381		)	(13,932		)	(13,932		)
Discontinued operations attributable to common unitholders	10,949			10,949			5,579			5,579
Net income (loss) attributable to common unitholders	$	1,568		$	1,568		$	(8,353	)	$	(8,353	)
Denominator
Weighted-average units outstanding	145,958,358			145,958,358			145,220,765			145,220,765
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common unitholders	0.07			0.07			0.04			0.04
Net income (loss) attributable to common unitholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Amount allocable to unvested restricted unitholders	(191		)	(191		)	(263		)	(263		)
Preferred unit dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(17,822		)	(17,822		)	(18,398		)	(18,398		)
Discontinued operations attributable to common unitholders	26,632			26,632			7,415			7,415
Net income (loss) attributable to common unitholders	$	8,810		$	8,810		$	(10,983	)	$	(10,983	)
Denominator
Weighted-average units outstanding	145,721,890			145,721,890			144,852,515			144,852,515
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common unitholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common unitholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

XML

Deferred Costs (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Components of Deferred Costs Net [Abstract]
Leasing Costs, Total Cost	$ 136,451	$ 140,772
Financing Costs, Total Cost	40,800	38,929
Total Cost	177,251	179,701
Leasing Costs, Accumulated Amortization	(53,224)	(50,990)
Financing Costs, Accumulated Amortization	(9,107)	(13,349)
Total, Accumulated Amortization	(62,331)	(64,339)
Leasing Costs, Deferred Costs, net	83,227	89,782
Financing Costs, Deferred Costs, net	31,693	25,580
Deferred Costs	$ 114,920	$ 115,362

XML

Summary of Significant Accounting Policies Available for sale securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 42,142
Available-for-sale Securities, Gross Unrealized Losses	(70)
Available-for-sale Securities, Current	$ 42,072	$ 0
Available For Sale Securities Interest Rate Range Minimum	2.875%
Available For Sale Securities Interest Rate Range Maximum	5.45%

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Partners Equity of The Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator
Loss from continuing operations, Basic	$ (4,147)	$ (11,813)	$ (10,494)	$ (14,139)
Loss from continuing operations, Diluted	(4,147)	(11,813)	(10,494)	(14,139)
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(191)	(263)
Amount allocable to unvested restricted unitholders, Diluted	(95)	(121)	(191)	(263)
Preferred share dividends, Basic	(3,049)	(1,998)	(5,047)	(3,996)
Preferred share dividends, Diluted	(3,049)	(1,998)	(5,047)	(3,996)
Redemption Premium, Basic	(2,090)	0	(2,090)	0
Redemption Premium, Diluted	(2,090)	0	(2,090)	0
Income from discontinued operations	10,949	5,579	26,632	7,415
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,537	(8,188)	8,645	(10,767)
Net income (loss) available to common shareholders, Diluted	1,537	(8,188)	8,645	(10,767)
Denominator
Weighted-average units outstanding, Basic	143,300,637	135,342,538	143,060,796	134,962,093
Weighted-average shares/units outstanding, Diluted	143,300,637	135,342,538	143,060,796	134,962,093
Income per Common Partnership Unit:
Loss from continuing operations attributable to common shareholders/unitholders, Basic	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Loss from continuing operations attributable to common shareholders/unitholders, Diluted	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations attributable to common shareholders, Basic	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Discontinued operations attributable to common shareholders, Diluted	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Income (Loss) From Discontinued Operations Diluted	10,949	5,579	26,632	7,415
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Loss from continuing operations, Basic	(4,147)	(11,813)	(10,494)	(14,139)
Loss from continuing operations, Diluted	(4,147)	(11,813)	(10,494)	(14,139)
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(191)	(263)
Amount allocable to unvested restricted unitholders, Diluted	(95)	(121)	(191)	(263)
Preferred share dividends, Basic	(3,049)	(1,998)	(5,047)	(3,996)
Preferred share dividends, Diluted	(3,049)	(1,998)	(5,047)	(3,996)
Redemption Premium, Basic	(2,090)	0	(2,090)	0
Redemption Premium, Diluted	(2,090)	0	(2,090)	0
Loss from continuing operations available to common unitholders, Basic	(9,381)	(13,932)	(17,822)	(18,398)
Loss from continuing operations available to common unit holders, Diluted	(9,381)	(13,932)	(17,822)	(18,398)
Income from discontinued operations	10,949	5,579	26,632	7,415
Discontinued operations attributable to common unit holders, Diluted	10,949	5,579	26,632	7,415
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,568	(8,353)	8,810	(10,983)
Net income (loss) available to common shareholders, Diluted	$ 1,568	$ (8,353)	$ 8,810	$ (10,983)
Denominator
Weighted-average units outstanding, Basic	145,958,358	145,220,765	145,721,890	144,852,515
Weighted-average shares/units outstanding, Diluted	145,958,358	145,220,765	145,721,890	144,852,515
Income per Common Partnership Unit:
Loss from continuing operations attributable to common shareholders/unitholders, Basic	$ (0.06)	$ (0.10)	$ (0.12)	$ (0.13)
Loss from continuing operations attributable to common shareholders/unitholders, Diluted	$ (0.06)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations attributable to common shareholders, Basic	$ 0.07	$ 0.04	$ 0.18	$ 0.05
Discontinued operations attributable to common shareholders, Diluted	$ 0.07	$ 0.04	$ 0.18	$ 0.05
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)

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Deferred Costs (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Deferred Costs (Textuals) [Abstract]
Capitalized internal direct leasing costs	$ 1.4	$ 1.7	$ 2.7	$ 3.2

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Commitments and Contingencies (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Aug. 05, 2010
Commitments and Contingencies (Textuals) [Abstract]
Minimum remaining lease period	17
Maximum remaining lease period	91
Annual rental payment under ground lease	The annual rental payment under this ground lease is ten dollars through August 2022 which is when the initial term of the ground lease will end. After the initial term, the Company has the option to renew the lease until 2091.
Area of Two Logan Square in Philadelphia	708,844
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage	$ 2,900,000
Liability related to acquisition of TRC	700,000
Accretion Of Liability Related To Acquisition	2,900,000
Balance portion of acquisition related liability	1,400,000
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition	15 years
Three Logan Square [Member] | Ground Lease [Member]
Commitments and Contingencies (Textuals) [Abstract]
Annual rental payment during initial term of ground lease	10
Minimum amount of annual rental payment	3,000,000
Minimum amount of annual rental payments	4,000,000
Aggregate fair market rent future payment as of the date of acquisition		$ 27,400,000

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Summary of Significant Accounting Policies (Held-to-Maturity Securities) (Details) (Banco Santander Bonds [Member], USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Mar. 23, 2012
Banco Santander Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, Premium Paid			$ 200,000
Cash Received for Held-to-Maturity Securities Sold	20,009,000
Premium on held-to-maturity securities	20,042,000
Accrued Investment Income Receivable			500,000
Interest income rate (as a percent)		2.875%
Loss On Held-to-maturity Securities Sold	$ (33,000)

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Intangible Assets (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2012

Dec. 31, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

	June 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	82,861	$	(54,017	)	$	28,844
Tenant relationship value	67,414		(44,560		)	22,854
Above market leases acquired	8,729		(2,500		)	6,229
Total	$	159,004	$	(101,077	)	$	57,927
Below market leases acquired	$	74,100	$	(42,574	)	$	31,526

	December 31, 2011
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	91,426	$	(55,498	)	$	35,928
Tenant relationship value	72,813		(45,114		)	27,699
Above market leases acquired	12,744		(5,856		)	6,888
Total	$	176,983	$	(106,468	)	$	70,515
Below market leases acquired	$	75,685	$	(40,579	)	$	35,106

Annual amortization of intangible assets and liabilities

	Assets		Liabilities
2012 (six months remaining)	$	8,083	$	3,321
2013	12,358		6,308
2014	9,549		4,741
2015	7,159		2,597
2016	4,526		1,704
Thereafter	16,252		12,855
Total	$	57,927	$	31,526

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Commitments and Contingencies (Ground Rent) (Details) (Ground Rent [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Ground Rent [Member]
Minimum future rental payments on non-cancelable leases
2012 (six months remaining)	$ 909
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	$ 288,983

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Share Based and Deferred Compensation (Restricted Share Activity) (Details) (Restricted Share Awards [Member], USD $)	6 Months Ended
	Jun. 30, 2012
Restricted Share Awards [Member]
Company's restricted share activity
Non-vested at January 1, 2012, shares	807,291
Non-vested at January 1, 2012, Weighted Average Grant Date Fair value	$ 9.46
Granted, shares	228,777
Granted, Weighted Average Grant Date Fair value	$ 10.91
Vested, shares	(393,976)
Vested, Weighted Average Grant Date Fair value	$ 5.91
Forfeited, shares	(5,806)
Forfeited, Weighted Average Grant Date Fair Value	$ 11.32
Non-vested at June 30, 2012, shares	636,286
Non-vested at June 30, 2012, Weighted Average Grant Date Fair value	$ 12.61

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Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Assets [Member]
Annual amortization of intangible assets and liabilities
2012	$ 8,083
2013	12,358
2014	9,549
2015	7,159
2016	4,526
Thereafter	16,252
Total	57,927
Liabilities [Member]
Annual amortization of intangible assets and liabilities
2012	3,321
2013	6,308
2014	4,741
2015	2,597
2016	1,704
Thereafter	12,855
Total	$ 31,526

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Reportable_Segments	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments			7
Real estate investments, at cost:
Operating properties	$ 4,639,047		$ 4,639,047		$ 4,793,080
Construction-in-progress	57,420		57,420		25,083
Land inventory	109,564		109,564		109,008
Total revenue	137,576	139,249	276,987	280,866
Property operating expenses, real estate taxes and third party management expenses	53,304	54,407	108,105	113,746
Net operating income	84,272	84,842	168,882	167,120
Pennsylvania Suburbs [Member]
Real estate investments, at cost:
Operating properties	1,167,390		1,167,390		1,218,071
Total revenue	36,934	37,159	75,039	75,136
Property operating expenses, real estate taxes and third party management expenses	12,711	12,825	26,055	28,617
Net operating income	24,223	24,334	48,984	46,519
Philadelphia CBD [Member]
Real estate investments, at cost:
Operating properties	955,563		955,563		953,870
Total revenue	31,911	30,573	65,061	62,423
Property operating expenses, real estate taxes and third party management expenses	11,965	11,203	24,650	23,423
Net operating income	19,946	19,370	40,411	39,000
Metropolitan, D.C. [Member]
Real estate investments, at cost:
Operating properties	1,182,895		1,182,895		1,255,803
Total revenue	26,967	30,309	53,403	60,640
Property operating expenses, real estate taxes and third party management expenses	10,454	11,486	20,520	23,135
Net operating income	16,513	18,823	32,883	37,505
New Jersey/ Delaware [Member]
Real estate investments, at cost:
Operating properties	545,241		545,241		545,657
Total revenue	20,287	19,832	40,889	39,811
Property operating expenses, real estate taxes and third party management expenses	8,932	9,516	18,668	20,603
Net operating income	11,355	10,316	22,221	19,208
Richmond, Virginia [Member]
Real estate investments, at cost:
Operating properties	307,932		307,932		307,698
Total revenue	8,902	9,278	17,937	18,076
Property operating expenses, real estate taxes and third party management expenses	3,471	3,614	7,113	7,003
Net operating income	5,431	5,664	10,824	11,073
Austin, Texas [Member]
Real estate investments, at cost:
Operating properties	258,924		258,924		257,694
Total revenue	8,188	7,637	15,681	15,749
Property operating expenses, real estate taxes and third party management expenses	3,612	3,412	7,009	6,506
Net operating income	4,576	4,225	8,672	9,243
California [Member]
Real estate investments, at cost:
Operating properties	221,102		221,102		254,287
Total revenue	4,831	4,781	9,800	9,584
Property operating expenses, real estate taxes and third party management expenses	2,488	2,563	4,858	5,004
Net operating income	2,343	2,218	4,942	4,580
Corporate [Member]
Real estate investments, at cost:
Operating properties	0		0		0
Construction-in-progress	57,420		57,420		25,083
Land inventory	109,564		109,564		109,008
Total revenue	(444)	(320)	(823)	(553)
Property operating expenses, real estate taxes and third party management expenses	(329)	(212)	(768)	(545)
Net operating income	$ (115)	$ (108)	$ (55)	$ (8)

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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of consolidated net operating income
Consolidated net operating income	$ 84,272	$ 84,842	$ 168,882	$ 167,120
Less:
Interest expense	(32,981)	(34,738)	(67,125)	(67,131)
Deferred financing costs	(1,261)	(1,070)	(2,572)	(1,998)
Depreciation and amortization	(49,331)	(55,710)	(98,880)	(105,214)
Administrative expenses	(6,079)	(5,890)	(12,129)	(12,134)
Plus:
Interest income	1,841	421	2,324	862
Interest expense — financing obligation	(196)	0	(378)	0
Equity in income of real estate ventures	838	1,088	882	2,321
Net gain on sales of interests in real estate ventures	0	0	0	2,791
Gain (loss) on early extinguishment of debt	(1,250)	(756)	(1,498)	(756)
Income (loss) from continuing operations	(4,147)	(11,813)	(10,494)	(14,139)
Income from discontinued operations	10,949	5,579	26,632	7,415
Net income (loss)	$ 6,802	$ (6,234)	$ 16,138	$ (6,724)

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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $)	6 Months Ended				12 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Series C Preferred Stock [Member]	Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Jul. 19, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Jul. 05, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Jul. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares	Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares	Jul. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member]	Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member]	Aug. 05, 2010 BRANDYWINE OPERATING PARTNERSHIP, L.P. Class F (2010) Units
Partners Equity of The Operating Partnership (Textuals) [Abstract]
Distribution Declared per common partnership unit						$ 0.15
Dividends Payable, Amount							$ 21,600,000
Percentage of Preferential return				6.90%	0.00%				7.375%		6.90%
Dividends, Preferred Stock, Cash	5,047,000	3,996,000	200,000					1,100,000		1,800,000
Partnership units issued for acquisition												7,111,112
Market price of shares on acquisition date												11.54
Dividend rate												$ 0.60

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Segment Information

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

As of June 30, 2012, 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, Camden and Mercer 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. The California segment includes properties in Oakland, Concord, Carlsbad and Rancho Bernardo. 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 is as follows (in thousands):

	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan, D.C.		New Jersey/Delaware		Richmond, Virginia		Austin, Texas		California		Corporate			Total
As of June 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,167,390	$	955,563	$	1,182,895	$	545,241	$	307,932	$	258,924	$	221,102	$	—		$	4,639,047
Construction-in-progress															57,420			57,420
Land inventory															109,564			109,564
As of December 31, 2011:
Real estate investments, at cost:
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
For the three-months ended June 30, 2012:
Total revenue	$	36,934	$	31,911	$	26,967	$	20,287	$	8,902	$	8,188	$	4,831	$	(444	)	$	137,576
Property operating expenses, real estate taxes and third party management expenses	12,711		11,965		10,454		8,932		3,471		3,612		2,488		(329		)	53,304
Net operating income	$	24,223	$	19,946	$	16,513	$	11,355	$	5,431	$	4,576	$	2,343	$	(115	)	$	84,272
For the three-months ended June 30, 2011:
Total revenue	$	37,159	$	30,573	$	30,309	$	19,832	$	9,278	$	7,637	$	4,781	$	(320	)	$	139,249
Property operating expenses, real estate taxes and third party management expenses	12,825		11,203		11,486		9,516		3,614		3,412		2,563		(212		)	54,407
Net operating income	$	24,334	$	19,370	$	18,823	$	10,316	$	5,664	$	4,225	$	2,218	$	(108	)	$	84,842
For the six-months ended June 30, 2012:
Total revenue	$	75,039	$	65,061	$	53,403	$	40,889	$	17,937	$	15,681	$	9,800	$	(823	)	$	276,987
Property operating expenses, real estate taxes and third party management expenses	26,055		24,650		20,520		18,668		7,113		7,009		4,858		(768		)	108,105
Net operating income	$	48,984	$	40,411	$	32,883	$	22,221	$	10,824	$	8,672	$	4,942	$	(55	)	$	168,882
For the six-months ended June 30, 2011:
Total revenue	$	75,136	$	62,423	$	60,640	$	39,811	$	18,076	$	15,749	$	9,584	$	(553	)	$	280,866
Property operating expenses, real estate taxes and third party management expenses	28,617		23,423		23,135		20,603		7,003		6,506		5,004		(545		)	113,746
Net operating income	$	46,519	$	39,000	$	37,505	$	19,208	$	11,073	$	9,243	$	4,580	$	(8	)	$	167,120

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. Below is a reconciliation of consolidated NOI to consolidated net income (loss), as defined by GAAP:

	Three-month periods ended June 30,						Six-month periods ended June 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,272		$	84,842		$	168,882		$	167,120
Less:
Interest expense	(32,981		)	(34,738		)	(67,125		)	(67,131		)
Deferred financing costs	(1,261		)	(1,070		)	(2,572		)	(1,998		)
Depreciation and amortization	(49,331		)	(55,710		)	(98,880		)	(105,214		)
Administrative expenses	(6,079		)	(5,890		)	(12,129		)	(12,134		)
Plus:
Interest income	1,841			421			2,324			862
Interest expense - financing obligation	(196		)	—			(378		)	—
Equity in income of real estate ventures	838			1,088			882			2,321
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on early extinguishment of debt	(1,250		)	(756		)	(1,498		)	(756		)
Loss from continuing operations	(4,147		)	(11,813		)	(10,494		)	(14,139		)
Income from discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)

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Real Estate Investments (Acquisitions and Dispositions) (Details) (USD $) In Millions, unless otherwise specified	Jan. 06, 2012 Plymouth Meeting, Pennsylvania [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
Significant Acquisitions and Disposals [Line Items]
Net rentable space of property acquired	154,392
Acquired real estate, cost of property	$ 9.1
Acquisition related costs	0.1
Net rentable square feet of properties sold		121,381	268,240	32,978
Sales price of properties sold		$ 29.0	$ 91.1	$ 3.0
Lease percentage of sold property		83.70%	100.00%	90.10%

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Operating Leases Future Minimum Payments Due

2012 (six months remaining)	$	909
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,983

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Tax Credit Transactions (Details) (USD $)	6 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended	0 Months Ended	1 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Historic Tax Credit Transaction [Member]	Jun. 30, 2011 Historic Tax Credit Transaction [Member]	Jun. 30, 2012 Historic Tax Credit Transaction [Member]	Jun. 30, 2011 Historic Tax Credit Transaction [Member]	Dec. 31, 2011 Historic Tax Credit Transaction [Member]	Nov. 17, 2008 Historic Tax Credit Transaction [Member] sqft	Jun. 30, 2012 New Markets Tax Credit Transaction [Member]	Oct. 19, 2011 USB [Member] Historic Tax Credit Transaction [Member]	Jun. 30, 2010 USB [Member] Historic Tax Credit Transaction [Member]	Dec. 31, 2009 USB [Member] Historic Tax Credit Transaction [Member]	Nov. 30, 2008 USB [Member] Historic Tax Credit Transaction [Member]	Jun. 30, 2012 USB [Member] Historic Tax Credit Transaction [Member]	Dec. 31, 2011 USB [Member] Historic Tax Credit Transaction [Member]	Aug. 27, 2010 USB [Member] Historic Tax Credit Transaction [Member]	Jun. 30, 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											27,400,000	23,800,000	10,200,000
Amount received from contribution										2,700,000
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	100.00%				20.00%
USB contributions presented within deferred income									13,300,000					51,600,000	51,600,000		13,300,000
Contribution allocated in non controlling interest			2,500,000		2,500,000		2,400,000
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
Cash received as revenue							12,000,000
Allocated expenses within other income (expense)							500,000
Deferred transaction costs	114,920,000	115,362,000	2,100,000		2,100,000		2,100,000		5,300,000
Rate of return on noncontrolling interest expected					2.00%
Accretion of non-controlling interest liability			300,000	300,000	700,000	700,000
Expected Benefit From a Qualified NMTC Program									$ 7,800,000
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

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Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2012

Discontinued Operations and Disposal Groups [Abstract]

Revenue and expenses information for the property classified as discontinued operations

	Three-month period ended June 30, 2012		Six-month period ended June 30, 2012
Revenue:
Rents	$	2,003	$	6,113
Tenant reimbursements	343		758
Termination fees	—		7
Other	86		89
Total revenue	2,432		6,967
Expenses:
Property operating expenses	594		1,701
Real estate taxes	217		726
Depreciation and amortization	840		2,744
Total operating expenses	1,651		5,171
Other income (expense):
Interest income	2		2
Income from discontinued operations before gain on sale of interests in real estate	783		1,798
Net gain on disposition of discontinued operations	10,166		24,834
Income from discontinued operations	$	10,949	$	26,632

	Three-month period ended June 30, 2011		Six-month period ended June 30, 2011
Revenue:
Rents	$	5,620	$	11,292
Tenant reimbursements	750		1,931
Other	5		2
Total revenue	6,375		13,225
Expenses:
Property operating expenses	1,581		3,639
Real estate taxes	707		1,446
Depreciation and amortization	2,344		4,561
Total operating expenses	4,632		9,646
Income from discontinued operations before gain on sale of interests in real estate	1,743		3,579
Net gain on disposition of discontinued operations	3,836		3,836
Income from discontinued operations	$	5,579	$	7,415

Disclosure of Long Lived Assets Held-for-sale [Table Text Block]

	June 30,
	2012
Real Estate Investments:
Operating properties	$	52,990
Accumulated depreciation	(14,385		)
	38,605
Construction-in-progress	36
	38,641
Receivables	1,374
Deferred costs, net	1,137
Other assets	298
Total assets held for sale	$	41,450
Liabilities held for sale	$	878

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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial position of the Real Estate Ventures
Company's share of equity (Company's basis)	$ 133,292	$ 115,807
Unconsolidated real estate ventures [Member]
Financial position of the Real Estate Ventures
Net property	840,292	846,643
Other Assets	113,449	110,520
Other Liabilities	46,225	48,798
Debt	679,026	745,830
Equity	228,490	162,535
Company's share of equity (Company's basis)	$ 133,292	$ 115,807

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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	Jun. 30, 2012	Dec. 31, 2011
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 31.6	$ 33.1
Settlement value of non controlling interest in operating partnership	$ 32.8	$ 25.6

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Debt Obligations (Details Textuals) (USD $)	6 Months Ended						6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Feb. 01, 2012 Unsecured Debt [Member]	Jun. 30, 2012 Letter of Credit [Member] Unsecured Debt [Member]	Jun. 30, 2012 New Revolving Credit Facility [Member] Unsecured Debt [Member]	Dec. 15, 2011 New Revolving Credit Facility [Member] Unsecured Debt [Member]	Jun. 30, 2012 Bank Term Loan and the Credit Facility [Member] Unsecured Debt [Member]	Jun. 30, 2012 $300.0M 5.750% Guaranteed Notes due 2012 [Member] Unsecured Debt [Member]	Jun. 30, 2012 $250.0M 5.400% Guaranteed Notes due 2014 [Member] Unsecured Debt [Member]	Jun. 30, 2012 $250.0M 7.500% Guaranteed Notes due 2015 [Member] Unsecured Debt [Member]	Jun. 30, 2012 $250.0M 6.000% Guaranteed Notes due 2016 [Member] Unsecured Debt [Member]	Jun. 30, 2012 $300.0M 5.700% Guaranteed Notes due 2017 [Member] Unsecured Debt [Member]	Jun. 30, 2012 $325.0M 4.950% Guaranteed Notes due 2018 [Member] Unsecured Debt [Member]	Feb. 01, 2012 Three Year Term Loan [Member] Unsecured Debt [Member]	Feb. 01, 2012 Four Year Term Loan [Member] Unsecured Debt [Member]	Feb. 01, 2012 Seven Year Term Loan [Member] Unsecured Debt [Member]
Debt obligations (Textuals)
Line of Credit Facility, Maximum Borrowing Capacity			$ 600,000,000
Debt instrument, face amount			600,000,000					300,000,000	250,000,000	250,000,000	250,000,000	300,000,000	325,000,000	150,000,000	250,000,000	200,000,000
Repayments of Unsecured Debt	37,500,000	0					183,000,000
Letters of credit outstanding				3,200,000
Option for additional borrowings subject to customary conditions and limitations						200,000,000
Unused availability under the Credit Facility					$ 596,800,000

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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011 Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 7,226,000	$ 18,186,000
Number of properties sold		2
Gross deferred gain on sale of properties		12,900,000
Purchase money mortgage loan repayments terms	start in 2013, to be fully paid in 2015
20 Year Amortization Period [Member] | Purchase money mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	7,200,000	7,200,000
Interest rate	8.50%	8.50%
Notes receivable amortization period, years	20 years	20 years
Due 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		500,000
Interest rate	10.00%	10.00%
Proceeds from Collection of Notes Receivable	300,000
Due 2016 [Member] | Purchase money mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		23,400,000
Notes receivable amortization period, years	7 years	7 years
Cash pay interest rate		6.00%
Interest accrual rate		7.64%
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

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Proceeds from Issuance of Common Stock	$ 0	$ 8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Supplemental disclosure:
Capitalized interest	1,207	859
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Proceeds from Issuance of Common Stock	0	8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Supplemental disclosure:
Capitalized interest	$ 1,207	$ 859

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Debt Obligations (Details Textuals 2) (USD $) In Millions, unless otherwise specified		3 Months Ended	6 Months Ended
	Jun. 30, 2012 Bank Term Loan And The Credit Facility [Member] Federal Funds Rate [Member]	Jun. 30, 2011 Unsecured Debt [Member]	Jun. 30, 2012 Unsecured Debt [Member] Seven Year Term Loan [Member]	Jun. 30, 2012 Unsecured Debt [Member] Three and Four Year Term Loan [Member]	Jun. 30, 2012 Secured Debt [Member]	Jun. 30, 2011 Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate		1.01%			6.72%	6.59%
Line of Credit Facility, Interest Rate During Period		0.99%
Declining prepayment penalty in year one			3.00%
Declining prepayment penalty in year two			2.00%
Declining prepayment penalty in year three			1.00%
Debt instrument, basis spread on variable rate	0.50%		1.90%
Derivative, Average Fixed Interest Rate			3.623%
Notional amount of interest rate cash flow hedge derivatives				$ 300.0
Derivative, lower fixed interest rate range				2.47%
Derivative, higher fixed interest rate range				2.91%
Derivative, lower remaining maturity range				3 years
Derivative, higher remaining maturity range				5 years

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Organization of The Parent Company and The Operating Partnership (Details)	6 Months Ended
	Jun. 30, 2012 sqft A
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Ownership in the Operating Partnership	98.20%
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	4
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	24,900,000
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	444
Area of additional undeveloped parcels of land with option to purchase	52
Unconsolidated real estate ventures [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of unconsolidated real estate ventures	18
Net rentable square feet	6,500,000
Wholly-owned management company subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	32,300,000
Third Parties and Unconsolidated Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	7,400,000
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	204
Industrial facilities [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	20
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

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Fair value of liabilities on recurring basis

	Fair Value Measurements at Reporting Date Using:
	June 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Available-for-Sale Securities	$	42,072	$	42,072	$	—	$	—
Liabilities:
Interest Rate Swaps	$	14,519	$	—	$	14,519	$	—

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, 2011 (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	2011		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	3,886	$	—	$	3,886	$	—

Held-to-maturity securities

	Held-to-Maturity Securities Sold
	Cash Received		Principal Amount		Loss
Banco Santander Chile Senior Notes	$	20,009	$	20,042	$	(33	)

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

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.

Also, for all entities determined to be VIEs, the Company does not provide financial support to the real estate ventures through liquidity arrangements, guarantees or other similar commitments. 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, or the general partners as a group, controls a limited partnership or similar entity when the limited partners 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 that the Company controls through its general partner status, but the limited partners in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights. 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 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, real estate venture agreements, LLC 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 entities that are consolidated but 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 related costs are expensed 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 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 amounts representing the value of tenant relationships and 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 generally 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 generally 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 three 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.

Characteristics considered by the Company in allocating value to its tenant relationships include the nature and extent of the Company’s business relationship with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals, among other factors. The value of tenant relationship intangibles is generally 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 generally amortized over the remaining non-cancelable term of the respective leases and any fixed-rate renewal periods.

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

Impairment or Disposal of Long-Lived Assets

The accounting standard for property, plant and equipment provides a single accounting model for long-lived assets classified as held-for-sale; defines the scope of businesses to be disposed of that qualify for reporting as discontinued operations; and affects the timing of recognizing losses on such operations.

The Company reviews long-lived assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The review of recoverability is based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the long-lived asset’s use and eventual disposition. These cash flows consider factors such as expected future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a long-lived asset, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair-value of the property. The Company is required to make subjective assessments as to whether there are impairments in the values of the investments in long-lived assets. These assessments have a direct impact on its net income because recording an impairment loss results in an immediate negative adjustment to net income. 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. Although the Company’s strategy is generally to hold its properties over the long-term, the Company will selectively dispose of properties for strategic needs. If the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized to reduce the property to the lower of the carrying amount or fair value less costs to sell, and such loss could be material. If the Company determines that impairment has occurred and the assets are classified as held and used, the affected assets must be reduced to their fair-value.

Where properties have been identified as having a potential for sale, additional judgments are required related to the determination as to the appropriate period over which the undiscounted cash flows should include the operating cash flows and the amount included as the estimated residual value. Management determines the amounts to be included based on a probability weighted cash flow. This requires significant judgment. In some cases, the results of whether an impairment is indicated are sensitive to changes in assumptions input into the estimates, including the hold period until expected sale.

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.

Under the equity method, investments in unconsolidated joint 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 impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the 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.

Revenue Recognition

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

Leases also typically provide for tenant reimbursement of a portion of common area maintenance 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, significant assumptions and judgments are made by the Company in determining the lease term such as when termination options are provided to the tenant. The lease term impacts the period over which minimum rents are determined and recorded and also considers the period over which lease related costs are amortized. Termination fees received from tenants, bankruptcy settlement fees, third party management fees, labor reimbursement and leasing income are recorded when earned.

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.

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.

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.

The expensed amounts are included in general and administrative expense on the Company’s consolidated income statement in the respective periods.

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

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.

The Company estimates the fair value of its outstanding available-for-sale securities, certificates of deposit and 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.

Securities held-to-maturity

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 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.

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 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 taxable TRSs, which are subject to federal, state and local income tax.

Recent Accounting Pronouncements

In January 2012, the Financial Accounting Standards Board (FASB) issued an amendment to the accounting standard for the presentation of comprehensive income. The amendment requires entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In addition, the amendment requires entities to present on the face of the financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. This amendment is effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations as the amendment relates only to changes in financial statement presentation.

In January 2012, the FASB issued amendments to the accounting standard for fair value measurements and disclosures. The amendments change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendments are intended to create comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with U.S. GAAP and International Financial Reporting Standards. These amendments are effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations.

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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Intangible assets
Total Cost	$ 159,004	$ 176,983
Accumulated Amortization	(101,077)	(106,468)
Intangible Assets, net	57,927	70,515
In-place lease value [Member]
Intangible assets
Total Cost	82,861	91,426
Accumulated Amortization	(54,017)	(55,498)
Intangible Assets, net	28,844	35,928
Tenant relationship value [Member]
Intangible assets
Total Cost	67,414	72,813
Accumulated Amortization	(44,560)	(45,114)
Intangible Assets, net	22,854	27,699
Above market leases acquired [Member]
Intangible assets
Total Cost	8,729	12,744
Accumulated Amortization	(2,500)	(5,856)
Intangible Assets, net	6,229	6,888
Below market leases acquired [Member]
Intangible assets
Total Cost	74,100	75,685
Accumulated Amortization	(42,574)	(40,579)
Intangible Assets, net	$ 31,526	$ 35,106

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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 02, 2010	Jun. 30, 2012 PJP VII [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member]	Jun. 30, 2012 Banco Santander Bonds [Member]	Mar. 23, 2012 Banco Santander Bonds [Member]
Variable Interest Entity [Line Items]
Cash Received for Held-to-Maturity Securities Sold											$ 20,009,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount												50,000,000
Guarantor Obligations, Current Carrying Value						700,000
Summary Of Significant Accounting Policies (Textuals) [Abstract]
Development costs for land	7,900,000		7,900,000
Revenue increased by straight-line rent adjustment	5,300,000	4,100,000	11,600,000	8,300,000
Increased revenue due to amortization of deferred rent	600,000	600,000	1,200,000	1,200,000
Decrease in revenue due to amortization of lease incentives	100,000	400,000	500,000	600,000
Increase in Common shares available for future awards					6,000,000
Increase in shares due to amendments in plan, shares solely available for options and share appreciation rights	4,108,336		4,108,336		3,600,000
Common shares available for future awards	5,272,017		5,272,017
Options awarded, term			one to ten-year
Award vesting term, minimum			1 year
Award vesting term, maximum			10 years
Stock-based compensation expense	1,900,000	1,600,000	3,600,000	3,300,000			800,000	800,000	1,500,000	1,600,000
Stock-based compensation expense, capitalized	$ 500,000	$ 400,000	$ 900,000	$ 700,000			$ 200,000	$ 100,000	$ 300,000	$ 300,000
Distributable income minimum percentage			90.00%

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Real Estate Investments (Tables)

6 Months Ended

Jun. 30, 2012

Real Estate [Abstract]

Gross carrying value of the Company's Properties

	June 30, 2012		December 31, 2011
Land	$	649,690	$	677,891
Building and improvements	3,522,597		3,631,388
Tenant improvements	466,760		483,801
	$	4,639,047	$	4,793,080

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Investment in Unconsolidated Ventures (Tables)

6 Months Ended

Jun. 30, 2012

Equity Method Investments and Joint Ventures [Abstract]

Financial position of unconsolidated Real Estate Ventures

	June 30, 2012		December 31, 2011
Net property	$	840,292	$	846,643
Other assets	113,449		110,520
Other liabilities	46,225		48,798
Debt	679,026		745,830
Equity	228,490		162,535
Company’s share of equity (Company’s basis)	133,292		115,807

Summary of results of operations of unconsolidated Real Estate Ventures

	Three-month periods ended June 30,				Six-month periods ended June 30,
	2012		2011		2012		2011
Revenue	$	39,008	$	32,722	$	77,601	$	72,398
Operating expenses	11,000		14,370		27,815		30,544
Interest expense, net	9,840		9,550		21,089		21,673
Depreciation and amortization	13,887		8,487		25,358		18,968
Net income (loss)	4,281		315		3,339		1,213
Company’s share of income (Company’s basis)	838		1,088		882		2,321

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ 16,138	$ (6,724)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	101,624	109,776
Amortization of deferred financing costs	2,572	1,998
Amortization of debt discount/(premium), net	745	529
Amortization of stock compensation costs	2,433	3,063
Shares used for employee taxes upon vesting of share awards	(2,234)	(1,012)
Straight-line rent income	(12,861)	(9,447)
Amortization of acquired above (below) market leases to rental revenue, net	(2,922)	(2,636)
Straight-line ground rent expense	949	975
Provision for doubtful accounts	962	689
Real estate venture income in excess of distributions	(590)	(1,618)
Net gain on sale of interests in real estate	(24,834)	(6,627)
Loss on early extinguishment of debt	1,498	756
Changes in assets and liabilities:
Accounts receivable	3,561	2,063
Other assets	5,260	2,231
Accounts payable and accrued expenses	(11,546)	(4,500)
Deferred income, gains and rent	(2,871)	(5,048)
Deferred financing obligation	(825)	0
Other liabilities	(1,438)	3,874
Net cash from operating activities	75,621	88,342
Cash flows from investing activities:
Acquisition of properties	(9,226)	(22,032)
Payments to Acquire Available-for-sale Securities, Debt	(98,744)	0
Proceeds from the sale of available-for-sale securities	56,322	0
Sales of properties, net	120,957	5,639
Proceeds from repayment of mortgage notes receivable	23,931	0
Capital expenditures	(51,701)	(67,768)
Advances for purchase of tenant assets, net of repayments	283	(386)
Loan provided to unconsolidated Real Estate Venture partner	0	(1,045)
Investment in unconsolidated Real Estate Ventures	(18,617)	0
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	1,723	3,063
Leasing costs	(14,940)	(14,724)
Net cash from (used in) investing activities	9,988	(97,253)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	181,500
Repayments of Credit Facility	(297,000)	(322,500)
Repayments of mortgage notes payable	(6,028)	(122,204)
Proceeds from Unsecured Notes Payable	0	321,498
Deferred financing obligation non-cash interest expense	468	0
Proceeds from Issuance of Common Stock	0	8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Redemption of preferred units	(50,188)	0
Repayments from unsecured notes	(167,371)	(23,931)
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,431)	(3,662)
Proceeds from Stock Options Exercised	276	429
Distributions paid to shareholders/unitholders	(47,059)	(44,669)
Distributions to noncontrolling interest	(797)	(838)
Net cash from (used in) financing activities	104,036	(6,921)
Increase (decrease) in cash and cash equivalents	189,645	(15,832)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	190,055	733
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2012 and 2011 of $1,207 and $859, respectively	69,480	67,098
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,735)	903
Change in capital expenditures financed through retention payable at period end	56	(5,500)
Change in unfunded tenant allowance	(1,144)	514
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income (loss)	16,138	(6,724)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	101,624	109,776
Amortization of deferred financing costs	2,572	1,998
Amortization of debt discount/(premium), net	745	529
Amortization of stock compensation costs	2,433	3,063
Shares used for employee taxes upon vesting of share awards	(2,234)	(1,012)
Straight-line rent income	(12,861)	(9,447)
Amortization of acquired above (below) market leases to rental revenue, net	(2,922)	(2,636)
Straight-line ground rent expense	949	975
Provision for doubtful accounts	962	689
Real estate venture income in excess of distributions	(590)	(1,618)
Net gain on sale of interests in real estate	(24,834)	(6,627)
Loss on early extinguishment of debt	1,498	756
Changes in assets and liabilities:
Accounts receivable	3,561	2,063
Other assets	5,260	2,231
Accounts payable and accrued expenses	(11,546)	(4,500)
Deferred income, gains and rent	(2,871)	(5,048)
Deferred financing obligation	(825)	0
Other liabilities	(1,438)	3,874
Net cash from operating activities	75,621	88,342
Cash flows from investing activities:
Acquisition of properties	(9,226)	(22,032)
Payments to Acquire Available-for-sale Securities, Debt	(98,744)	0
Proceeds from the sale of available-for-sale securities	56,322	0
Sales of properties, net	120,957	5,639
Proceeds from repayment of mortgage notes receivable	23,931	0
Capital expenditures	(51,701)	(67,768)
Advances for purchase of tenant assets, net of repayments	283	(386)
Loan provided to unconsolidated Real Estate Venture partner	0	(1,045)
Investment in unconsolidated Real Estate Ventures	(18,617)	0
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	1,723	3,063
Leasing costs	(14,940)	(14,724)
Net cash from (used in) investing activities	9,988	(97,253)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	181,500
Repayments of Credit Facility	(297,000)	(322,500)
Repayments of mortgage notes payable	(6,028)	(122,204)
Deferred financing obligation non-cash interest expense	468	0
Proceeds from Issuance of Common Stock	0	8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Redemption of preferred units	(50,188)	0
Repayments from unsecured notes	(167,371)	(23,931)
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,431)	(3,662)
Proceeds from Stock Options Exercised	276	429
Distributions paid to shareholders/unitholders	(47,856)	(45,507)
Net cash from (used in) financing activities	104,036	(6,921)
Increase (decrease) in cash and cash equivalents	189,645	(15,832)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	190,055	733
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2012 and 2011 of $1,207 and $859, respectively	69,480	67,098
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,735)	903
Change in capital expenditures financed through retention payable at period end	56	(5,500)
Change in unfunded tenant allowance	$ (1,144)	$ 514

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Deferred Costs (Tables)

6 Months Ended

Jun. 30, 2012

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred Costs

	June 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	136,451	$	(53,224	)	$	83,227
Financing Costs	40,800		(9,107		)	31,693
Total	$	177,251	$	(62,331	)	$	114,920

	December 31, 2011
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	140,772	$	(50,990	)	$	89,782
Financing Costs	38,929		(13,349		)	25,580
Total	$	179,701	$	(64,339	)	$	115,362

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Share Based and Deferred Compensation (Tables)

6 Months Ended

Jun. 30, 2012

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, 2012	3,599,672		$	14.50	7.20	$	(18,015,060	)
Granted	—		—		—	—
Exercised	(94,429	)	$	2.91	—	—
Canceled	(21,706	)	$	15.62
Outstanding at June 30, 2012	3,483,537		$	14.47	6.46	$	(8,656,997	)
Vested/Exercisable at June 30, 2012	2,811,754		$	15.56	6.33	$	(9,052,503	)

Company's restricted share activity

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2012	807,291		$	9.46
Granted	228,777		10.91
Vested	(393,976	)	5.91
Forfeited	(5,806	)	11.32
Non-vested at June 30, 2012	636,286		$	12.61

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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of results of operations of Real Estate Ventures
Company's share of income (Company's basis)	$ 838,000	$ 1,088,000	$ 882,000	$ 2,321,000
Unconsolidated real estate ventures [Member]
Summary of results of operations of Real Estate Ventures
Revenue	39,008,000	32,722,000	77,601,000	72,398,000
Operating expenses	11,000,000	14,370,000	27,815,000	30,544,000
Interest expense, net	9,840,000	9,550,000	21,089,000	21,673,000
Depreciation and amortization	13,887,000	8,487,000	25,358,000	18,968,000
Net income	4,281,000	315,000	3,339,000	1,213,000
Guaranteed repayment of loans on behalf of a certain Real Estate Venture	$ 700,000		$ 700,000

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Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012 Y
Option activity
Outstanding at beginning of year, shares	3,599,672
Granted, shares	0
Exercised, shares	(94,429)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(21,706)
Outstanding at end of year, shares	3,483,537
Vested/Exercisable, shares	2,811,754
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.50
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 2.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 15.62
Outstanding at end of year, Weighted Average Exercise Price	$ 14.47
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.56
Outstanding at beginning of year, Weighted Average Remaining Contractual Term (in years)	7.20
Granted, Weighted Average Remaining Contractual Term (in years)	0.00
Outstanding at end of year, Weighted Average Remaining Contractual Term (in years)	6.46
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	6.33
Outstanding at beginning of year, Aggregate Intrinsic Value	$ (18,015,060)
Outstanding at end of year, Aggregate Intrinsic Value	(8,656,997)
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ (9,052,503)

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Real estate investments:
Rental properties	$ 4,639,047	$ 4,793,080
Accumulated depreciation	(897,367)	(865,710)
Operating real estate investments, net	3,741,680	3,927,370
Construction-in-progress	57,420	25,083
Land inventory	109,564	109,008
Total real estate investments, net	3,908,664	4,061,461
Cash and cash equivalents	190,055	410
Accounts receivable, net	11,445	14,718
Accrued rent receivable, net	113,380	108,101
Assets Held-for-sale, at Carrying Value	41,450	0
Investment in real estate ventures, at equity	133,292	115,807
Deferred costs, net	114,920	115,362
Intangible assets, net	57,927	70,515
Notes receivable	7,226	18,186
Other assets	48,739	53,158
Total assets	4,669,170	4,557,718
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	505,214	511,061
Unsecured credit facility	0	275,500
Unsecured term loans	600,000	37,500
Unsecured senior notes, net of discounts	1,404,627	1,569,934
Accounts payable and accrued expenses	57,653	69,929
Distributions payable	24,889	23,895
Deferred income, gains and rent	95,390	99,569
Acquired lease intangibles, net	31,526	35,106
Other liabilities	55,264	45,528
Liabilities of Assets Held-for-sale	878	0
Total liabilities	2,775,441	2,668,022
Commitments and contingencies (Note 17)
Brandywine Realty Trust's equity:
Preferred Shares	96,850
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 200,000,000; 143,367,946 and 142,690,755 issued in 2012 and 2011, respectively and 143,367,946 and 142,690,755 outstanding in 2012 and 2011, respectively	1,431	1,424
Additional paid-in capital	2,826,475	2,776,197
Deferred compensation payable in common shares	5,436	5,631
Common shares in grantor trust, 293,122 in 2012 and 292,646 in 2011	(5,436)	(5,631)
Cumulative earnings	493,266	477,338
Accumulated other comprehensive loss	(16,449)	(6,079)
Cumulative distributions	(1,442,662)	(1,392,332)
Total Brandywine Realty Trust's equity	1,862,124	1,856,591
Non-controlling interests	31,605	33,105
Total equity	1,893,729	1,889,696
Total liabilities and equity	4,669,170	4,557,718
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Rental properties	4,639,047	4,793,080
Accumulated depreciation	(897,367)	(865,710)
Operating real estate investments, net	3,741,680	3,927,370
Construction-in-progress	57,420	25,083
Land inventory	109,564	109,008
Total real estate investments, net	3,908,664	4,061,461
Cash and cash equivalents	190,055	410
Available-for-sale securities, Current	42,072	0
Accounts receivable, net	11,445	14,718
Accrued rent receivable, net	113,380	108,101
Assets Held-for-sale, at Carrying Value	41,450	0
Investment in real estate ventures, at equity	133,292	115,807
Deferred costs, net	114,920	115,362
Intangible assets, net	57,927	70,515
Notes receivable	7,226	18,186
Other assets	48,739	53,158
Total assets	4,669,170	4,557,718
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	505,214	511,061
Unsecured credit facility	0	275,500
Unsecured term loans	600,000	37,500
Unsecured senior notes, net of discounts	1,404,627	1,569,934
Accounts payable and accrued expenses	57,653	69,929
Distributions payable	24,889	23,895
Deferred income, gains and rent	95,390	99,569
Acquired lease intangibles, net	31,526	35,106
Other liabilities	55,264	45,528
Liabilities of Assets Held-for-sale	878	0
Total liabilities	2,775,441	2,668,022
Commitments and contingencies (Note 17)
Redeemable limited partnership units at redemption value;
Redeemable limited partnership units at redemption value; 2,657,721 and 2,698,648 issued and outstanding in 2012 and 2011, respectively	40,106	38,370
Brandywine Realty Trust's equity:
Preferred Shares		0
General Partnership Capital, 143,367,946 and 142,690,755 units issued in 2012 and 2011, respectively and 143,367,946 and 142,690,755 units outstanding in 2012 and 2011, respectively	1,717,657	1,754,302
Accumulated other comprehensive loss	(16,422)	(6,426)
Total Brandywine Realty Trust's equity	1,853,623	1,851,326
Total liabilities and equity	4,669,170	4,557,718
7.50% Series D Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Preferred Shares	0	47,912
7.50% Series C Preferred Shares
Brandywine Realty Trust's equity:
Preferred Shares	0	20
7.375% Series D Preferred Shares
Brandywine Realty Trust's equity:
Preferred Shares	23	23
Total equity	63	43
6.90% Series E Preferred Stock [Member]
Brandywine Realty Trust's equity:
Preferred Shares	40	0
6.90% Series E Preferred Stock [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Preferred Shares	55,538	55,538
6.90% Series E-linked Preferred Stock [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity:
Preferred Shares	$ 96,850

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Summary of Significant Accounting Policies (Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	$ 42,072	$ 0
Available-for-sale Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	42,072
Available-for-sale Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	42,072
Available-for-sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	0
Available-for-sale Securities [Member] | Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	0
Interest Rate Swap [Member] | Recurring [Member]
Liabilities:
Interest Rate Swaps	14,519	3,886
Interest Rate Swap [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member]
Liabilities:
Interest Rate Swaps	0	0
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Liabilities:
Interest Rate Swaps	14,519	3,886
Interest Rate Swap [Member] | Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Liabilities:
Interest Rate Swaps	$ 0	$ 0

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Consolidated Statements of Beneficiaries' Equity (USD $) In Thousands, except Share data	Total	Total Preferred Shares	Series C Preferred Stock [Member]	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
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
Beginning Balance, shares at Dec. 31, 2010		4,300,000			134,601,796	116,679	291,281
Net income (loss)	(6,724)									(6,508)			(216)
Comprehensive income (loss)	(539)										(529)		(10)
Issuance of Common Shares of Beneficial Interest	8,272				7				8,265
Issuance of Common Shares of Beneficial Interest, shares					679,285
Equity issuance costs	260								234				26
Conversion of LP Units to Common Shares	0				1				1,098				(1,099)
Conversion of LP Units to Common Shares, shares					92,992
Bonus Share Issuance	6					12	5	(5)		(6)
Bonus Share Issuance, shares						(463)	463
Vesting of Restricted Shares	(355)				1	3,062			(1,820)	(1,598)
Vesting of Restricted Shares, shares					85,248	(116,216)	9,043
Restricted Share Amortization	1,519								1,519
Restricted Performance Units Amortization	780								780
Exercise of Stock Options	429				1				428
Exercise of Stock Options, shares					76,887
Share Option Amortization	728								728
Outperformance Plan Amortization	109								109
Outperformance Plan Amortization, shares
Share Issuance from/to Deferred Compensation Plan	(16)						(42)	42	(16)
Share Issuance from/to Deferred Compensation Plan, shares					(487)		4,935
Share Choice Plan Issuance Shares					1,684
Share Choice Plan Issuance	(55)								(55)
Stock Issued During Period, Value, Other	32								32
Stock Issued During Period, Shares, Other					2,672
Adjustment to Non-controlling Interest	0								2,679				(2,679)
Preferred Share distributions	(3,996)											(3,996)
Preferred share redemption charge	0
Distributions declared ($0.30), and ($0.30) per share in June 30, 2012 and June 30, 2011, respectively	(41,660)											(40,836)	(824)
Ending Balance at Jun. 30, 2011	1,936,044	43			1,353	0	5,737	(5,737)	2,684,730	475,327	(2,474)	(1,346,353)	123,418
Ending Balance, shares at Jun. 30, 2011		4,300,000			135,536,709	0	295,852
Beginning 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
Beginning Balance, shares at Dec. 31, 2011		4,300,000			142,690,755	0	292,646
Net income (loss)	16,138									15,973			165
Comprehensive income (loss)	(10,564)										(10,370)		(194)
Preferred Stock, Shares Issued		2,300,000	0	4,000,000
Preferred Stock, Value, Issued	96,850	23	0	40
Preferred Stock, Including Additional Paid in Capital, Net of Discount									96,810
Equity issuance costs	(610)								(610)
Stock Redeemed or Called During Period, Shares			(2,000,000)
Additional Paid in Capital, Preferred Stock									(47,890)
Stock Redeemed or Called During Period, Value	(47,910)		(20)
Conversion of LP Units to Common Shares	(228)								149	(45)			(332)
Conversion of LP Units to Common Shares, shares					20,464
Bonus Share Issuance	387								387
Bonus Share Issuance, shares					35,703
Vesting of Restricted Shares	(1,292)				3				(1,295)
Vesting of Restricted Shares, shares					280,851		9,036
Restricted Share Amortization	1,426								1,426
Vesting of Restricted Performance Units	(1,329)				3				(1,332)
Vesting of Restricted Performance Units, shares					249,797
Restricted Performance Units Amortization	1,205								1,205
Exercise of Stock Options	275				1				274
Exercise of Stock Options, shares	94,429				94,429
Share Option Amortization	747								747
Share Issuance from/to Deferred Compensation Plan	0						195	(195)
Share Issuance from/to Deferred Compensation Plan, shares					5,389		8,560
Stock Issued During Period, Value, Other	15								15
Stock Issued During Period, Shares, Other					1,336
Adjustment to Non-controlling Interest	13								392				(379)
Preferred Share distributions	(5,047)											(5,047)
Preferred share redemption charge	(2,090)											(2,090)
Distributions declared ($0.30), and ($0.30) per share in June 30, 2012 and June 30, 2011, respectively	(43,953)											(43,193)	(760)
Ending Balance at Jun. 30, 2012	1,893,729	63			1,431	0	5,436	(5,436)	2,826,475	493,266	(16,449)	(1,442,662)	31,605
Ending Balance, shares at Jun. 30, 2012		6,300,000			143,367,946	0	293,122
Beginning Balance at Mar. 31, 2012
Net income (loss)	6,802
Comprehensive income (loss)	(10,639)
Preferred Stock, Shares Issued		2,300,000		4,000,000
Preferred Stock, Value, Issued	96,850	23		40
Preferred share redemption charge	(2,090)
Ending Balance at Jun. 30, 2012	$ 1,893,729	$ 63				$ 0
Ending Balance, shares at Jun. 30, 2012		6,300,000				0

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Debt Obligations (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Schedule of principal payments of debt obligations
Repurchase Amount	$ 16,476
Principal	14,693
Loss	(1,499)
Deferred Financing Amortization	16
2012 5.750% Notes [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	309
Principal	301
Loss	(2)
Deferred Financing Amortization	0
Debt instrument stated interest rate	5.75%
2014 5.400% Notes
Schedule of principal payments of debt obligations
Repurchase Amount	4,630
Principal	4,302
Loss	(264)
Deferred Financing Amortization	7
Debt instrument stated interest rate	5.40%
2015 7.500% Notes [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	11,537
Principal	10,090
Loss	(1,233)
Deferred Financing Amortization	$ 9
Debt instrument stated interest rate	7.50%

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Disclosures [Abstract]

Schedule of financial instruments with fair values different from their carrying amount

	June 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable, net of discounts	$	506,363	$	553,976	$	512,391		$	545,784
Unsecured notes payable, net of discounts	$	1,330,618	$	1,411,533	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	8,785	$	31,157	(a)	$	32,756

_____________________

(a) For purposes of this disclosure, one of the notes is presented gross of the deferred gain of $12.9 million arising from the sale of two properties in 2009 accounted for under the accounting standard for installment sales.

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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Notional Amount	$ 578,610		$ 452,836
Fair value	14,519		3,886
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	[1]	200,000	[1]
Strike	0.03623	[1]
Fair value	7,600	[1]	2,820	[1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.702% Interest Rate Swap Maturing February 1, 2016 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	127,000	[1]	127,000	[1]
Strike	0.02702	[1]
Fair value	1,803	[1]	340	[1]
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	[1]	50,000	[1]
Strike	0.02470	[1]
Fair value	385	[1]	65	[1]
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	[1]	23,000	[1]
Strike	0.02513	[1]
Fair value	207	[1]	27	[1]
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	[1]	27,062	[1]
Strike	0.02750	[1]
Fair value	704	[1]	244	[1]
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	[1]	25,774	[1]
Strike	0.033	[1]
Fair value	1,126	[1]	390	[1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.780% Interest Rate Swap Maturing August 1, 2016 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	50,000	[1]	0	[1]
Strike	0.0278	[1]
Fair value	801	[1]	0	[1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.910% Interest Rate Swap Maturing February 1, 2017 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	50,000	[1]	0	[1]
Strike	0.02910	[1]
Fair value	969	[1]	0	[1]
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	[1]	0	[1]
Strike	0.03090	[1]
Fair value	$ 924	[1]	$ 0	[1]

[1] Hedging unsecured variable rate debt.

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Partners Equity of The Operating Partnership

6 Months Ended

Jun. 30, 2012

Equity [Abstract]

PARTNERS' EQUITY OF THE OPERATING PARTNERSHIP

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following table details 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):

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(9,381		)	(9,381		)	(13,932		)	(13,932		)
Discontinued operations attributable to common unitholders	10,949			10,949			5,579			5,579
Net income (loss) attributable to common unitholders	$	1,568		$	1,568		$	(8,353	)	$	(8,353	)
Denominator
Weighted-average units outstanding	145,958,358			145,958,358			145,220,765			145,220,765
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.06	)	$	(0.06	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common unitholders	0.07			0.07			0.04			0.04
Net income (loss) attributable to common unitholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Amount allocable to unvested restricted unitholders	(191		)	(191		)	(263		)	(263		)
Preferred unit dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(17,822		)	(17,822		)	(18,398		)	(18,398		)
Discontinued operations attributable to common unitholders	26,632			26,632			7,415			7,415
Net income (loss) attributable to common unitholders	$	8,810		$	8,810		$	(10,983	)	$	(10,983	)
Denominator
Weighted-average units outstanding	145,721,890			145,721,890			144,852,515			144,852,515
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common unitholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common unitholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common unitholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

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 three-months ended June 30, 2012 and 2011, earnings representing nonforfeitable dividends as noted in the table above were allocated to the unvested restricted units.

Common Partnership Units and Preferred Mirror Units

On April 11, 2012, the Operating Partnership issued 6.90% Series E-Linked Preferred Mirror Units to the Parent Company, in connection with the previously mentioned Series E Preferred Share Offering. On May 3, 2012, the Operating Partnership also redeemed all of its Series D Preferred Mirror Units as a result of the aforementioned redemption of Series C Preferred Shares. In accordance with GAAP, the Operating Partnership also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common units for the three and six-month periods ended June 30, 2012. These costs are listed above and shown within the Operating Partnership's consolidated statements of operations as "Preferred unit redemption charge". There were no comparable charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on July 19, 2012 to unitholders of record as of July 5, 2012.

On May 31, 2012, the Operating Partnership declared distributions on its Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units to holders of record as of June 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series E Preferred Mirror Units and Series E-Linked Preferred Mirror Units totaled $1.1 million and $1.8 million, respectively.

During the six-month period ended June 30, 2012, the Parent Company did not sell any shares related to the Offering Program.

The Operating Partnership issued 7,111,112 Class F (2010) Units on August 5, 2010 to a third party in connection with its acquisition of Three Logan Square. The Class F (2010) Units were valued based on the closing market price of the Parent Company’s common shares on the acquisition date ($11.54) less $0.60 to reflect that these units did not begin to accrue a dividend prior to the first anniversary of their issuance. The Class F (2010) Units were subject to redemption at the option of the holders after the first anniversary of the acquisition. The Operating Partnership had the option to satisfy the redemption either for an amount, per unit, of cash equal to the market price of one of the Parent Company’s common share (based on the five-day trading average ending on the date of the exchange) or for one of the Parent Company’s common shares. On December 23, 2011, the Operating Partnership satisfied in full the holder's tender for redemption of all 7,111,112 of the Class F (2010) Units through the issuance of 7,111,112 Parent Company's common shares.

Common Unit Repurchases

The Parent Company did not repurchase any shares under its share repurchase program during the six-month period ended June 30, 2012 and accordingly, during the six-month period ended June 30, 2011, 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 (Tables)

6 Months Ended

Jun. 30, 2012

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
				6/30/2012		12/31/2011						6/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	7,600	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	1,803		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	385		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	207		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	704		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,126		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	801		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	969		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	924		—
				$	578,610	$	452,836					$	14,519	$	3,886

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Tax Credit Transactions

6 Months Ended

Jun. 30, 2012

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. USB agreed to contribute approximately $64.1 million of project costs and advanced $10.2 million of that amount contemporaneously with the closing of the transaction. USB subsequently advanced an additional $27.4 million and $23.8 million in June 2010 and December 2009, respectively. On October 19, 2011, the Company received the remaining $2.7 million of the total contributions upon its completion of certain items and compliance with the federal rehabilitation regulations.

In exchange for its contributions into 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 USB contributions presented within the Company’s consolidated balance sheet amounted to $51.6 million as of June 30, 2012 and December 31, 2011, respectively. The contributions were recorded net of the amount allocated to non-controlling interest as described above of $2.5 million and $2.4 million at the end of the periods ended June 30, 2012 and December 31, 2011, 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 year ended December 31, 2011, the Company recognized $12.0 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 June 30, 2012 and December 31, 2011 is $2.1 million, and is 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 $0.3 million and $0.7 million for the three and six-month periods ended June 30, 2012, respectively, and $0.3 million and $0.7 million for the three and six-month periods ended June 30, 2011, respectively.

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 underserved 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 June 30, 2012 and December 31, 2011. 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 June 30, 2012 and December 31, 2011 is $5.3 million and is included in other assets in the Company’s consolidated balance sheet.

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Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator
Loss from continuing operations, Basic	$ (4,147)	$ (11,813)	$ (10,494)	$ (14,139)
Loss from continuing operations, Diluted	(4,147)	(11,813)	(10,494)	(14,139)
Net income from continuing operations attributable to non-controlling interests, Basic	169	276	322	364
Net income from continuing operations attributable to non-controlling interests, Diluted	169	276	322	364
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(191)	(263)
Amount allocable to unvested restricted shareholders, Diluted	(95)	(121)	(191)	(263)
Preferred share dividends, Basic	(3,049)	(1,998)	(5,047)	(3,996)
Preferred share dividends, Diluted	(3,049)	(1,998)	(5,047)	(3,996)
Redemption Premium, Basic	(2,090)	0	(2,090)	0
Redemption Premium, Diluted	(2,090)	0	(2,090)	0
Loss from continuing operations available to common shareholders, Basic	(9,212)	(13,656)	(17,500)	(18,034)
Loss from continuing operations available to common shareholders, Diluted	(9,212)	(13,656)	(17,500)	(18,034)
Income from discontinued operations	10,949	5,579	26,632	7,415
Income (loss) from discontinued operations, Diluted	10,949	5,579	26,632	7,415
Discontinued operations attributable to non-controlling interests - LP units	(200)	(111)	(487)	(148)
Discontinued operations attributable to non-controlling interests, diluted	(200)	(111)	(487)	(148)
Discontinued operations attributable to common shareholders, Basic	10,749	5,468	26,145	7,267
Discontinued operations attributable to common shareholders, Diluted	10,749	5,468	26,145	7,267
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,537	(8,188)	8,645	(10,767)
Net income (loss) available to common shareholders, Diluted	$ 1,537	$ (8,188)	$ 8,645	$ (10,767)
Denominator
Weighted-average units outstanding, Basic	143,300,637	135,342,538	143,060,796	134,962,093
Weighted-average shares/units outstanding, Diluted	143,300,637	135,342,538	143,060,796	134,962,093
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders/unitholders, Basic	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Loss from continuing operations attributable to common shareholders/unitholders, Diluted	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations attributable to common shareholders, Basic	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Discontinued operations attributable to common shareholders, Diluted	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)

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Consolidated Statements of Beneficiaries' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cumulative Distributions
Distributions declared, per share	$ 0.30	$ 0.30
Non-Controlling Interests
Distributions declared, per share	$ 0.30	$ 0.30

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Preferred Stock, Value, Issued	$ 96,850
Brandywine Realty Trust's equity:
Preferred shares, shares authorized	20,000,000	20,000,000
Common shares of Brandywine Realty Trust's beneficial interest, par value (in dollars per share)	$ 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	143,367,946	142,690,755
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding	143,367,946	142,690,755
Common shares in grantor trust, shares	293,122	292,646
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Preferred Stock, Value, Issued		0
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	6.90%	0.00%
Preferred shares, shares issued	4,000,000	0
Preferred shares, shares outstanding	4,000,000	0
Redeemable Limited Partnership, units issued	2,657,721	2,698,648
Redeemable Limited Partnership, units outstanding	2,657,721	2,698,648
General Partners' Capital account, units issued	143,367,946	142,690,755
General Partners' Capital account, units outstanding	143,367,946	142,690,755
7.50% Series C Preferred Shares
Preferred Stock, Value, Issued	0	20
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	0.00%	7.50%
Preferred shares, par value (in dollars per share)	$ 0	$ 0.01
Preferred shares, shares issued	0	2,000,000
Preferred shares, shares outstanding	0	2,000,000
7.375% Series D Preferred Shares
Preferred Stock, Value, Issued	23	23
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	7.375%	7.375%
Preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares, shares issued	2,300,000	2,300,000
Preferred shares, shares outstanding	2,300,000	2,300,000
7.50% Series D Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Preferred Stock, Value, Issued	0	47,912
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)		7.50%
Preferred shares, shares issued		2,000,000
Preferred shares, shares outstanding		2,000,000
7.375% Series E Preferred Shares
Preferred Stock, Value, Issued	40	0
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	6.90%
Preferred shares, par value (in dollars per share)	$ 0.01
Preferred shares, shares issued	4,000,000
Preferred shares, shares outstanding	4,000,000
7.375% Series E Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Preferred Stock, Value, Issued	$ 55,538	$ 55,538
Brandywine Realty Trust's equity:
Preferred shares, dividend rate (as a percent)	7.375%	7.375%
Preferred shares, shares issued	2,300,000	2,300,000
Preferred shares, shares outstanding	2,300,000	2,300,000

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Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2012

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

FAIR VALUE OF FINANCIAL INSTRUMENTS

The following fair value disclosure was determined by the Company using available market information and discounted cash flow analyses as of June 30, 2012 and December 31, 2011, 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. The Company believes that the carrying amounts reflected in the consolidated balance sheets at June 30, 2012 and December 31, 2011 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):

	June 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable, net of discounts	$	506,363	$	553,976	$	512,391		$	545,784
Unsecured notes payable, net of discounts	$	1,330,618	$	1,411,533	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	8,785	$	31,157	(a)	$	32,756

_____________________

(a) For purposes of this disclosure, one of the notes is presented gross of the deferred gain of $12.9 million arising from the sale of two properties in 2009 accounted for under the accounting standard for installment sales.

The fair value of the Company's unsecured notes payable, net of discounts, is categorized at a Level 1 basis (as provided by the accounting standard for Fair Value Measurements and Discloses). This is because the Company valued these instruments using quoted market prices as of June 30, 2012 and December 31, 2011.

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 and notes receivable were 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. These financial instruments have been categorized as Level 3 due to the fact that the Company considers the rates used in the valuation techniques to be unobservable inputs.

The only significant unobservable input in the discounted cash flow model is the discount rate. 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. 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 unsecured notes and mortgage loans used as of June 30, 2012 was 3.237%. 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.

Disclosure about the fair value of financial instruments is based upon pertinent information available to management as of June 30, 2012 and December 31, 2011. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since June 30, 2012, and current estimates of fair value may differ from the amounts presented herein.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 27, 2012
Entity Registrant Name	BRANDYWINE REALTY TRUST
Entity Central Index Key	0000790816
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
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	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		143,408,964
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Registrant Name	BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Central Index Key	0001060386
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

XML

Risk Management and Use of Financial Instruments

6 Months Ended

Jun. 30, 2012

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 on-going 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 counterparties on derivatives not fulfilling their obligations. Market risk is the risk of declines in the value of properties due to changes in rental rates, interest rates or other market factors affecting the valuation of properties held by the Company.

Risks and Uncertainties

Sluggish economic conditions have reduced the volume of real estate transactions and created credit stresses on many businesses. Vacancy rates may increase through 2012 and possibly beyond as the current economic climate negatively impacts tenants. The current financial markets also have an adverse effect on the Company’s other counter parties such as the counter parties in its derivative contracts.

The Company expects that the impact of the current state of the economy, including high unemployment and the continued volatility in the financial and credit markets, could continue to have a dampening effect on the fundamentals of its business, including potential increases in past due accounts, tenant defaults, lower occupancy and reduced effective rents. These conditions would negatively affect the Company’s future net income and cash flows and could have a material adverse effect on its financial condition.

The Company’s New Credit Facility, New Term Loans and the indenture governing the 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 New 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 New Credit Facility, the New 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 New 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 New Credit Facility. While the Company believes that there are currently no material adverse effect events, the Company is operating in unprecedented economic times and it is possible that such event could arise which would limit the Company’s borrowings under the New 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 New Credit Facility and the borrowings under the New Credit Facility would become due and payable. 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 June 30, 2012. 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 of a continued slow-down in the credit markets, the Company may not be able to remain in compliance with such covenants and if the lenders would not provide a waiver, an event of default could result.

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 June 30, 2012 and December 31, 2011. 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
				6/30/2012		12/31/2011						6/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	7,600	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	1,803		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	385		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	207		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	704		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,126		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	801		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	969		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	924		—
				$	578,610	$	452,836					$	14,519	$	3,886

(a) Hedging unsecured variable rate debt.

Concentration of Credit Risk

Concentrations of credit risk arise when a number of tenants related to the Company’s investments or rental operations are engaged in similar business activities, or are located in the same geographic region, or have similar economic features that would cause their inability to meet contractual obligations, including those to the Company, to be similarly affected. 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 any unusual concentration of credit risk. No tenant accounted for 10% or more of the Company’s rents during the three and six-month periods ended June 30, 2012 and 2011. Conditions in the general economy and the global credit markets have had a significant adverse effect on companies in 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 go into default under their leases.

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Subsequent Events (Details) (Oaklands Corporate Center [Member], USD $) In Millions, unless otherwise specified	Jul. 18, 2012 sqft Properties
Oaklands Corporate Center [Member]
Subsequent Event [Line Items]
Number of Properties Sold	11
Net Rentable Space	466,719
Sale Consideration Of Sold Property	$ 52.7

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Rents	$ 115,032	$ 114,995	$ 229,271	$ 230,328
Tenant reimbursements	18,605	18,237	37,613	40,177
Termination fees	101	1,948	1,591	2,516
Third party management fees, labor reimbursement and leasing	2,872	2,733	6,014	5,486
Other	966	1,336	2,498	2,359
Total revenue	137,576	139,249	276,987	280,866
Operating Expenses:
Property operating expenses	37,906	39,115	77,363	83,235
Real estate taxes	14,134	13,786	28,228	27,495
Third party management expenses	1,264	1,506	2,514	3,016
Depreciation and amortization	49,331	55,710	98,880	105,214
General and administrative expenses	6,079	5,890	12,129	12,134
Total operating expenses	108,714	116,007	219,114	231,094
Operating income	28,862	23,242	57,873	49,772
Other Income (Expense):
Interest expense	(32,981)	(34,738)	(67,125)	(67,131)
Investment Income, Interest	1,841	421	2,324	862
Interest expense - amortization of deferred financing costs	(1,261)	(1,070)	(2,572)	(1,998)
Interest expense — financing obligation	(196)	0	(378)	0
Equity in income of real estate ventures	838	1,088	882	2,321
Net gain on sale of interests in real estate	0	0	0	2,791
Gain (loss) on early extinguishment of debt	(1,250)	(756)	(1,498)	(756)
Income (loss) from continuing operations	(4,147)	(11,813)	(10,494)	(14,139)
Discontinued operations:
Income from discontinued operations	783	1,743	1,798	3,579
Net gain (loss) on disposition of discontinued operations	10,166	3,836	24,834	3,836
Total discontinued operations	10,949	5,579	26,632	7,415
Net income (loss)	6,802	(6,234)	16,138	(6,724)
Net income from discontinued operations attributable to non-controlling interests - LP units	(200)	(111)	(487)	(148)
Net (income) loss attributable to non-controlling interests - LP units	169	276	322	364
Net (income) loss attributable to non-controlling interests	(31)	165	(165)	216
Net income (loss) attributable to Brandywine Realty Trust	6,771	(6,069)	15,973	(6,508)
Distribution to Preferred Shares	(3,049)	(1,998)	(5,047)	(3,996)
Preferred share redemption charge	(2,090)	0	(2,090)	0
Amount allocated to unvested restricted shareholders	(95)	(121)	(191)	(263)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,537	(8,188)	8,645	(10,767)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations (in dollars per share)	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Basic income (loss) per Common Share (in dollars per share)	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.07)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations (in dollars per share)	$ 0.08	$ 0.04	$ 0.18	$ 0.05
Diluted income (loss) per Common Share (in dollars per share)	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Basic weighted average shares outstanding (in shares)	143,300,637	135,342,538	143,060,796	134,962,093
Diluted weighted average shares outstanding (in shares)	143,300,637	135,342,538	143,060,796	134,962,093
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	(3,978)	(11,537)	(10,172)	(13,775)
Income (loss) from discontinued operations	10,749	5,468	26,145	7,267
Net income (loss)	6,771	(6,069)	15,973	(6,508)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue:
Rents	115,032	114,995	229,271	230,328
Tenant reimbursements	18,605	18,237	37,613	40,177
Termination fees	101	1,948	1,591	2,516
Third party management fees, labor reimbursement and leasing	2,872	2,733	6,014	5,486
Other	966	1,336	2,498	2,359
Total revenue	137,576	139,249	276,987	280,866
Operating Expenses:
Property operating expenses	37,906	39,115	77,363	83,235
Real estate taxes	14,134	13,786	28,228	27,495
Third party management expenses	1,264	1,506	2,514	3,016
Depreciation and amortization	49,331	55,710	98,880	105,214
General and administrative expenses	6,079	5,890	12,129	12,134
Total operating expenses	108,714	116,007	219,114	231,094
Operating income	28,862	23,242	57,873	49,772
Other Income (Expense):
Interest expense	(32,981)	(34,738)	(67,125)	(67,131)
Investment Income, Interest	1,841	421	2,324	862
Interest expense - amortization of deferred financing costs	(1,261)	(1,070)	(2,572)	(1,998)
Interest expense — financing obligation	(196)	0	(378)	0
Equity in income of real estate ventures	838	1,088	882	2,321
Net gain on sale of interests in real estate	0	0	0	2,791
Gain (loss) on early extinguishment of debt	(1,250)	(756)	(1,498)	(756)
Income (loss) from continuing operations	(4,147)	(11,813)	(10,494)	(14,139)
Discontinued operations:
Income from discontinued operations	783	1,743	1,798	3,579
Net gain (loss) on disposition of discontinued operations	10,166	3,836	24,834	3,836
Total discontinued operations	10,949	5,579	26,632	7,415
Net income (loss)	6,802	(6,234)	16,138	(6,724)
Net income (loss) attributable to Brandywine Realty Trust	6,802	(6,234)	16,138	(6,724)
Distribution to Preferred Shares	(3,049)	(1,998)	(5,047)	(3,996)
Preferred share redemption charge	(2,090)	0	(2,090)	0
Amount allocated to unvested restricted shareholders	(95)	(121)	(191)	(263)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,568	(8,353)	8,810	(10,983)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.04	$ 0.18	$ 0.05
Basic income (loss) per Common Share (in dollars per share)	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.12)	$ (0.13)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.04	$ 0.18	$ 0.05
Diluted income (loss) per Common Share (in dollars per share)	$ 0.01	$ (0.06)	$ 0.06	$ (0.08)
Basic weighted average shares outstanding (in shares)	145,958,358	145,220,765	145,721,890	144,852,515
Diluted weighted average shares outstanding (in shares)	145,958,358	145,220,765	145,721,890	144,852,515
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	(4,147)	(11,813)	(10,494)	(14,139)
Income (loss) from discontinued operations	10,949	5,579	26,632	7,415
Net income (loss)	$ 6,802	$ (6,234)	$ 16,138	$ (6,724)

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Real Estate Investments

6 Months Ended

Jun. 30, 2012

Real Estate [Abstract]

REAL ESTATE INVESTMENTS

REAL ESTATE INVESTMENTS

As of June 30, 2012 and December 31, 2011 the gross carrying value of the Company’s Properties was as follows (in thousands):

	June 30, 2012		December 31, 2011
Land	$	649,690	$	677,891
Building and improvements	3,522,597		3,631,388
Tenant improvements	466,760		483,801
	$	4,639,047	$	4,793,080

Acquisitions

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 through an advance under its Credit Facility, since repaid with available corporate funds. The Company also capitalized $0.1 million of acquisition related costs, in accordance with guidance on asset acquisitions.

Dispositions

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. The property was 83.7% occupied as of the sale date.

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. The property was 100.0% occupied as of the date of sale.

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. The property was 90.1% occupied as of the date of sale.

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

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments (consisting solely of normal recurring matters) for a fair statement of the financial position of the Company as of June 30, 2012, the results of its operations for the three and six-month periods ended June 30, 2012 and 2011 and its cash flows for the six-month periods ended June 30, 2012 and 2011 have been included. The results of operations for such interim periods are not necessarily indicative of the results for a full year. These consolidated financial statements should be read in conjunction with the Parent Company’s and the Operating Partnership’s consolidated financial statements and footnotes included in their combined 2011 Annual Report on Form 10-K filed with the SEC on February 24, 2012.

Reclassifications

Certain amounts have been reclassified in prior years to conform to the current year presentation. The reclassifications are primarily due to the treatment of sold properties as discontinued operations on the statement of operations for all periods presented.

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 that the Company has determined to be VIEs but for which it is not the primary beneficiary, its maximum exposure to loss is the carrying amount of its investments, as the Company has not provided any guarantees other than the guarantee described for PJP VII which was approximately $0.7 million at June 30, 2012 (see Note 4). Also, for all entities determined to be VIEs, the Company does not provide financial support to the real estate ventures through liquidity arrangements, guarantees or other similar commitments. 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, or the general partners as a group, controls a limited partnership or similar entity when the limited partners 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 that the Company controls through its general partner status, but the limited partners in the entity have the substantive ability to dissolve the entity or remove the Company without cause or have substantive participating rights. 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 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, real estate venture agreements, LLC 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 entities that are consolidated but 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 related costs are expensed 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 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 amounts representing the value of tenant relationships and 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 generally 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 generally 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 three 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.

Characteristics considered by the Company in allocating value to its tenant relationships include the nature and extent of the Company’s business relationship with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals, among other factors. The value of tenant relationship intangibles is generally 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 generally amortized over the remaining non-cancelable term of the respective leases and any fixed-rate renewal periods.

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

Impairment or Disposal of Long-Lived Assets

The accounting standard for property, plant and equipment provides a single accounting model for long-lived assets classified as held-for-sale; defines the scope of businesses to be disposed of that qualify for reporting as discontinued operations; and affects the timing of recognizing losses on such operations.

The Company reviews long-lived assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The review of recoverability is based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the long-lived asset’s use and eventual disposition. These cash flows consider factors such as expected future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a long-lived asset, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair-value of the property. The Company is required to make subjective assessments as to whether there are impairments in the values of the investments in long-lived assets. These assessments have a direct impact on its net income because recording an impairment loss results in an immediate negative adjustment to net income. 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. Although the Company’s strategy is generally to hold its properties over the long-term, the Company will selectively dispose of properties for strategic needs. If the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized to reduce the property to the lower of the carrying amount or fair value less costs to sell, and such loss could be material. If the Company determines that impairment has occurred and the assets are classified as held and used, the affected assets must be reduced to their fair-value.

Where properties have been identified as having a potential for sale, additional judgments are required related to the determination as to the appropriate period over which the undiscounted cash flows should include the operating cash flows and the amount included as the estimated residual value. Management determines the amounts to be included based on a probability weighted cash flow. This requires significant judgment. In some cases, the results of whether an impairment is indicated are sensitive to changes in assumptions input into the estimates, including the hold period until expected sale.

The Company determined during its impairment review for the three and six-month periods ended June 30, 2012 and 2011, that no impairment charges were necessary.

The Company entered into development agreements related to two parcels of land under option for ground lease that require the Company to commence development by December 31, 2012. If the Company determines that construction cannot be started by the specified date, or that it is not in the Company's best economic interest to develop either parcel or negotiate an extension of the development period, the Company will then write off the parcel-specific costs that it has incurred in preparing these parcels of land for development, as it will have lost its rights under the ground lease. These costs, amounting to $7.9 million as of June 30, 2012, would have to be written-off in the period that it is determined that the development would not be commenced and an extension cannot be negotiated.

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.

Under the equity method, investments in unconsolidated joint 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 impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the 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.

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 $5.3 million and $11.6 million for the three and six-month periods ended June 30, 2012, and approximately $4.1 million and $8.3 million for the three and six-month periods ended June 30, 2011, respectively. 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 $0.6 million and $1.2 million for the three and six-month periods ended June 30, 2012, and by $0.6 million and $1.2 million for the three and six-month periods ended June 30, 2011, respectively. 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 $0.1 million and $0.5 million for the three and six-month periods ended June 30, 2012, and by $0.4 million and $0.6 million for the three and six-month periods ended June 30, 2011, respectively.

Leases also typically provide for tenant reimbursement of a portion of common area maintenance 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, significant assumptions and judgments are made by the Company in determining the lease term such as when termination options are provided to the tenant. The lease term impacts the period over which minimum rents are determined and recorded and also considers the period over which lease related costs are amortized. Termination fees received from tenants, bankruptcy settlement fees, third party management fees, labor reimbursement and leasing income are recorded when earned.

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 June 30, 2012, 5,272,017 common shares remained available for future awards under the 1997 Plan (including 4,108,336 shares available solely for options and share appreciation rights). Through June 30, 2012, all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $1.9 million and $3.6 million during the three and six-month periods ended June 30, 2012, of which $0.5 million and $0.9 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company incurred stock-based compensation expense of $1.6 million and $3.3 million during the three and six-month periods ended June 30, 2011, of which $0.4 million and $0.7 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.

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 outstanding available-for-sale securities, certificates of deposit and 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 June 30, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	June 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Assets:
Available-for-Sale Securities	$	42,072	$	42,072	$	—	$	—
Liabilities:
Interest Rate Swaps	$	14,519	$	—	$	14,519	$	—

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, 2011 (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	2011		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	3,886	$	—	$	3,886	$	—

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.

There were no items that were accounted for at fair value on a non-recurring basis for the six months ended June 30, 2012.

Available-for-sale securities and transfers of held-to-maturity securities

On March 23, 2012, the Company acquired a $50.0 million tranche of Banco Santander Chile Senior Notes, with $0.2 million premium paid for the debt securities and $0.5 million of accrued interest income. On the acquisition date, the bonds were designated by the Company as held-to-maturity securities, based upon the nature of the transaction, the Company's intention and ability to hold the securities to maturity, and other applicable guidance surrounding prepayment risk, liquidity needs, yield on alternative investments and other factors associated with the accounting standard for certain investments in debt and equity securities. The securities earn interest income at a rate of 2.875% annually, and are scheduled to mature on November 13, 2012. Throughout the second quarter of 2012, the Company sold $20.0 million of these securities, recognizing a nominal loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Company's best interest.

Subsequent to the above sales transaction, the Company transferred its entire remaining portfolio of held-to-maturity securities, as well as any investments made during the second quarter of 2012, to a designation of available-for-sale, consistent with the requirements of the accounting standard for the classification of debt and equity securities. Please refer to the Fair Value Measurements section for further discussion.

The following table sets forth the fair value of the available-for-sale securities held by the Company as of June 30, 2012 (in thousands):

	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value (Net Carrying Amount)
Available-for-sale securities (a)	$	42,142	$	(70	)	$	42,072

(a) The Company's available-for-sale securities at June 30, 2012 include securities with maturity dates ranging from September 1, 2012 to November 13, 2012, with related interest rates ranging from 2.875% to 5.450%.

The Company did not hold any available-for-sale or held-to-maturity securities as of December 31, 2011.

The following table sets forth the details of the previously designated held-to-maturity securities sold during the second quarter of 2012 (in thousands):

	Held-to-Maturity Securities Sold
	Cash Received		Principal Amount		Loss
Banco Santander Chile Senior Notes	$	20,009	$	20,042	$	(33	)

Notes Receivable

As of June 30, 2012, notes receivable included a $7.2 million purchase money mortgage with a 20 year amortization period that bears interest at 8.5%.

As of December 31, 2011, notes receivable included a $7.2 million purchase money mortgage with a 20 year amortization period that bears interest at 8.5%, a $0.5 million loan (due in 2015) that bears interest at 10%, and a $23.4 million (including accrued but unpaid interest) seven year purchase money mortgage (due 2016) that bears interest at approximately 6% cash pay/7.64% accrual.

During the current quarter, the $23.5 million 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.

During the current quarter, the $0.3 million loan (balance as of the payment date) bearing interest at 10% was also paid in full. This loan was previously due in 2015 before being paid in full.

The Company periodically assesses the collectability of the notes receivable in accordance with the accounting standard for loan receivables. The Company's $7.2 million outstanding purchase money mortgage note mentioned above was extended to a buyer (the “Borrower”) of a parcel of land in Newtown, Pennsylvania in December 2006. During 2011, the Borrower, who is developing a residential community, defaulted on the note and as a result, a forbearance agreement was entered into between the Company and the Borrower. The Borrower also entered into another forbearance agreement with a third party senior creditor bank related to the senior creditor's loan. The forbearance agreement between the Company and the Borrower outlined the repayment terms of the outstanding debt and the payment of accrued interest by the Borrower and included, among other things, the metrics for selling and settling on home sales over an agreed period of time. With the inherent credit risk in collecting interest from the note, as provided in the forbearance agreement, the Company has provided a full allowance for any accrued interest receivable. The Company has determined that the loan modification as discussed above represents a troubled debt restructuring since the Borrower was considered to be in a financial difficulty when it defaulted on the two mortgage debts and that a concession was granted in the form of the forbearance agreements. Construction has already recommenced, with loan repayments being paid to the senior creditor beginning in the first quarter of 2012. Loan repayments to the Company are scheduled to begin during 2013. In December of the prior year, the Borrower provided the Company and the third party senior creditor bank with expected future cash flows analysis showing its ability to meet its sales targets in 2012, with updates to the analysis being provided on a quarterly basis. The Company believes that, based on expected cash flows from the project and actual current year-to-date sales, the total note will be fully paid by 2015. The Company and the third party senior creditor bank allowed the Borrower to operate under the cash flow assumptions without amending the forbearance agreements. Given the current circumstances, the Company performed a collectability assessment of its note using the expected cash flow information provided by the Borrower and obtained third party documentation to support the assumptions used by the Borrower. The key assumptions used in the cash flow analysis included the revenue per home built; the cost to construct; the general and administrative expenses incurred to operate the business and sell homes; and the absorption assumptions used to determine the rate of home sales. The Company has determined based on the results of its probability weighted cash flow analysis that, as of June 30, 2012, the present value of the expected cash flows of the note receivable exceeded the outstanding balance of the note and therefore the note is recoverable as of June 30, 2012. However, it is still possible that due to further deterioration in the housing market, the Borrower will not meet its sales targets, and could cause a loan loss of the Company's note receivable which could be material to its consolidated results of operations.

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 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.

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 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 taxable TRSs, which are subject to federal, state and local income tax.

Recent Accounting Pronouncements

In January 2012, the Financial Accounting Standards Board (FASB) issued an amendment to the accounting standard for the presentation of comprehensive income. The amendment requires entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In addition, the amendment requires entities to present on the face of the financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. This amendment is effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations as the amendment relates only to changes in financial statement presentation.

In January 2012, the FASB issued amendments to the accounting standard for fair value measurements and disclosures. The amendments change the wording used to describe many of the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. The amendments are intended to create comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with U.S. GAAP and International Financial Reporting Standards. These amendments are effective for fiscal years and interim periods beginning after December 15, 2011. The Company’s adoption of the new standard did not have a material impact on its consolidated financial position or results of operations.

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Share Based and Deferred Compensation

6 Months Ended

Jun. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE BASED AND DEFERRED COMPENSATION

SHARE BASED AND DEFERRED COMPENSATION

Stock Options

At June 30, 2012, the Parent Company had 3,483,537 options outstanding under its shareholder approved equity incentive plan. There were 671,783 options unvested as of June 30, 2012 and $1.6 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 1.3 years. During the three and six-month periods ended June 30, 2012 the Company recognized compensation expense related to unvested options of $0.4 million and $0.7 million, of which $0.1 million and a $0.2 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. During the three and six-month periods ended June 30, 2011, the Company recognized compensation expense related to unvested options of $0.4 million and $0.7 million, of which $0.1 million and $0.2 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization.

Option activity as of June 30, 2012 and changes during the six-months ended June 30, 2012 were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2012	3,599,672		$	14.50	7.20	$	(18,015,060	)
Granted	—		—		—	—
Exercised	(94,429	)	$	2.91	—	—
Canceled	(21,706	)	$	15.62
Outstanding at June 30, 2012	3,483,537		$	14.47	6.46	$	(8,656,997	)
Vested/Exercisable at June 30, 2012	2,811,754		$	15.56	6.33	$	(9,052,503	)

Restricted Share Awards

As of June 30, 2012, 636,286 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 June 30, 2012 was approximately $4.7 million. That expense is expected to be recognized over a weighted average remaining vesting period of 2.6 years. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $1.5 million during the three and six-month periods ended June 30, 2012, of which $0.2 million and $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $1.6 million during the three and six-month periods ended June 30, 2011, of which $0.1 million and $0.3 million, respectively, were capitalized. The expensed amounts are included in general and administrative expense on the Company’s consolidated statement of operations in the respective periods.

The following table summarizes the Company’s restricted share activity for the six-months ended June 30, 2012:

	Shares		Weighted Average Grant Date Fair value
Non-vested at January 1, 2012	807,291		$	9.46
Granted	228,777		10.91
Vested	(393,976	)	5.91
Forfeited	(5,806	)	11.32
Non-vested at June 30, 2012	636,286		$	12.61

On March 1, 2012, the Compensation Committee of the Company’s Board of Trustees awarded 194,858 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, be terminated without cause or retire in a qualifying retirement prior to the vesting date. Qualifying retirement for restricted shares granted on March 1, 2012 as provided in the Plan award agreements means the recipient’s voluntary termination of employment after reaching age 57 and accumulating at least 15 years of service with the Company. As of June 30, 2012, none of the Company’s executives had met conditions to elect a qualifying retirement.

Restricted Performance Share Units Plan

On March 1, 2012, March 2, 2011, and March 4, 2010, the Compensation Committee of the Parent Company’s Board of Trustees awarded an aggregate of 262,713, 123,107, and 119,766 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 year measurement period that commenced on January 1, 2012 (in the case of the March 1, 2012 awards), January 1, 2011 (in the case of the March 2, 2011 awards), and January 1, 2010 (in the case of the March 4, 2010 awards) and that ends on the earlier of December 31, 2014, December 31, 2013 or December 31, 2012 (as applicable) or the date of a change of control. In the case of the awards made on March 1, 2012, our 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 our proxy peer group over such period. In the case of the awards made on March 2, 2011 and March 4, 2010, our performance is compared to the total shareholder return of REITs within an index over such respective periods. The awards are also 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” more performance units for the account of the unit holder at the price per common share ending on the dividend payment date. If earned, awards will be settled in common shares in an amount that reflects both the number of performance units 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 return of the REIT within the index or peer group, as applicable.

If the total shareholder return during the measurement period places the Company at or above a certain percentile as compared to the REITs within the index or peer group, as applicable, then at the end of the measurement period the number of shares that will be delivered shall equal a certain percentage (not to exceed 200%) of the participant's base units.

On the date of each grant, the awards were valued using a Monte Carlo simulation. The fair value of the 2012 award on the grant date was $4.2 million, while the fair values of the 2011 and 2010 awards were $2.0 million, respectively. The fair values of each award are being amortized over the three year cliff vesting period. In the case of the 2012 and 2011 awards, the vesting of the RPSUs is also subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled, terminated without cause or retire in a qualifying retirement prior to the vesting date. Qualifying retirement for RPSUs granted on March 1, 2012 and March 1, 2011 as provided under the 1997 Plan means the recipient’s voluntary termination of employment after reaching age 57 and accumulating at least 15 years of service with the Company. As of June 30, 2012, none of the Company’s executives has met conditions to elect a qualifying retirement.

For the three and six-month periods ended June 30, 2012, the Company recognized total compensation expense for the 2012, 2011, and 2010 awards of $0.7 million and $1.3 million, of which $0.2 million and $0.4 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the three and six-month periods ended June 30, 2011, the Company recognized total compensation expense for the 2011 and 2010 awards of $0.5 million and $0.8 million, of which $0.1 million and $0.2 million, respectively, were capitalized.

In the case of the Company's previous April 1, 2009 award, a total of 372,102 shares were delivered to award recipients on March 1, 2012. These shares, which all vested on December 31, 2011 (the end of its three-year measurement period), were also paid cash dividends on January 19, 2012.

Employee Share Purchase Plan

On May 9, 2007, the Parent Company’s shareholders approved the 2007 Non-Qualified Employee Share Purchase Plan (the “ESPP”). The ESPP 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 2012 plan year is limited to the lesser of 20% of compensation or $50,000. The number of shares initially reserved for issuance under the ESPP is 1.25 million. During the three and six-month periods ended June 30, 2012, employees made purchases under the ESPP of $0.1 million and $0.2 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and six-month periods ended June 30, 2012. During the three and six-month periods ended June 30, 2011, employees made purchases under the ESPP of $0.1 million and $0.2 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and six-month periods ended June 30, 2011. 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. For the six-month periods ended June 30, 2012 and June 30, 2011, the Company recorded net increases in compensation costs of $0.6 million and $0.4 million, respectively, in connection with the Plan due to the change in the market value of the participant investments in the Plan.

The deferred compensation obligations are unfunded, but the Company has purchased company-owned life insurance policies and 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 each of the six-month periods ended June 30, 2012 and June 30, 2011, the Company recorded net decreases in compensation costs of $0.4 million in connection with the 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 share 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 each of June 30, 2012 and 2011, 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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Discontinued Operations

6 Months Ended

Jun. 30, 2012

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS

For the three and six-month periods ended June 30, 2012, income from discontinued operations relates to the three properties that the Company sold during 2012, as well as 11 properties that were designated as held-for-sale as of June 30, 2012. The Company determined that 11 of its flex/office properties located in Exton, Pennsylvania met the criteria for assets held-for-sale pursuant to the related requirements provided for the classification as held for sale under the accounting standard for long lived assets. Accordingly, at June 30, 2012, these properties are required to be measured at the lower of their carrying value or the estimated fair value less costs to sell. No provision for impairment was recognized at June 30, 2012 as the estimated fair value of the properties less costs to sell were higher than their carrying value. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and six-month periods ended June 30, 2012 (in thousands):

	Three-month period ended June 30, 2012		Six-month period ended June 30, 2012
Revenue:
Rents	$	2,003	$	6,113
Tenant reimbursements	343		758
Termination fees	—		7
Other	86		89
Total revenue	2,432		6,967
Expenses:
Property operating expenses	594		1,701
Real estate taxes	217		726
Depreciation and amortization	840		2,744
Total operating expenses	1,651		5,171
Other income (expense):
Interest income	2		2
Income from discontinued operations before gain on sale of interests in real estate	783		1,798
Net gain on disposition of discontinued operations	10,166		24,834
Income from discontinued operations	$	10,949	$	26,632

The following table summarizes the balance sheet information for the 11 properties identified as held-for-sale at June 30, 2012 (in thousands):

	June 30,
	2012
Real Estate Investments:
Operating properties	$	52,990
Accumulated depreciation	(14,385		)
	38,605
Construction-in-progress	36
	38,641
Receivables	1,374
Deferred costs, net	1,137
Other assets	298
Total assets held for sale	$	41,450
Liabilities held for sale	$	878

For the three and six-month periods ended June 30, 2011, income from discontinued operations relates to the seven properties that the Company sold from January 1, 2011 through June 30, 2012, as well as the 11 flex/office properties identified as held-for-sale at June 30, 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and six-month periods ended June 30, 2011 (in thousands):

	Three-month period ended June 30, 2011		Six-month period ended June 30, 2011
Revenue:
Rents	$	5,620	$	11,292
Tenant reimbursements	750		1,931
Other	5		2
Total revenue	6,375		13,225
Expenses:
Property operating expenses	1,581		3,639
Real estate taxes	707		1,446
Depreciation and amortization	2,344		4,561
Total operating expenses	4,632		9,646
Income from discontinued operations before gain on sale of interests in real estate	1,743		3,579
Net gain on disposition of discontinued operations	3,836		3,836
Income from discontinued operations	$	5,579	$	7,415

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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Intangible Assets

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

As of June 30, 2012 and December 31, 2011, the Company’s intangible assets were comprised of the following (in thousands):

	June 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	82,861	$	(54,017	)	$	28,844
Tenant relationship value	67,414		(44,560		)	22,854
Above market leases acquired	8,729		(2,500		)	6,229
Total	$	159,004	$	(101,077	)	$	57,927
Below market leases acquired	$	74,100	$	(42,574	)	$	31,526

	December 31, 2011
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	91,426	$	(55,498	)	$	35,928
Tenant relationship value	72,813		(45,114		)	27,699
Above market leases acquired	12,744		(5,856		)	6,888
Total	$	176,983	$	(106,468	)	$	70,515
Below market leases acquired	$	75,685	$	(40,579	)	$	35,106

As of June 30, 2012, the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no early lease terminations):

	Assets		Liabilities
2012 (six months remaining)	$	8,083	$	3,321
2013	12,358		6,308
2014	9,549		4,741
2015	7,159		2,597
2016	4,526		1,704
Thereafter	16,252		12,855
Total	$	57,927	$	31,526

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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	Jun. 30, 2012	Dec. 31, 2011
Summary of debt repurchases
2012	$ 6,444
2013	66,924
2014	250,612
2015	467,272
2016	596,609
Thereafter	1,127,730
Total principal payments	2,515,591
Net unamortized premiums/(discounts)	(5,750)
Total Debt Obligations	$ 2,509,841	$ 2,393,995

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Investment in Unconsolidated Ventures

6 Months Ended

Jun. 30, 2012

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED VENTURES

INVESTMENT IN UNCONSOLIDATED VENTURES

As of June 30, 2012, the Company had an aggregate investment of approximately $133.3 million in 18 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 properties. As of June 30, 2012, 15 of the Real Estate Ventures owned 51 office buildings that contain an aggregate of approximately 6.5 million net rentable square feet; two Real Estate Ventures owned four acres of undeveloped parcels of land; 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 following is a summary of the financial position of the Real Estate Ventures as of June 30, 2012 and December 31, 2011 (in thousands):

	June 30, 2012		December 31, 2011
Net property	$	840,292	$	846,643
Other assets	113,449		110,520
Other liabilities	46,225		48,798
Debt	679,026		745,830
Equity	228,490		162,535
Company’s share of equity (Company’s basis)	133,292		115,807

The following is a summary of results of operations of the Real Estate Ventures for the three and six-month periods ended June 30, 2012 and 2011 (in thousands):

	Three-month periods ended June 30,				Six-month periods ended June 30,
	2012		2011		2012		2011
Revenue	$	39,008	$	32,722	$	77,601	$	72,398
Operating expenses	11,000		14,370		27,815		30,544
Interest expense, net	9,840		9,550		21,089		21,673
Depreciation and amortization	13,887		8,487		25,358		18,968
Net income (loss)	4,281		315		3,339		1,213
Company’s share of income (Company’s basis)	838		1,088		882		2,321

As of June 30, 2012, the Company had guaranteed repayment of approximately $0.7 million of loans on behalf of a Real Estate Venture. The Company, from time to time, also provides customary environmental indemnities in connection with construction and permanent financing both for its own account and on behalf of its Real Estate Ventures.

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Deferred Costs

6 Months Ended

Jun. 30, 2012

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

DEFERRED COSTS

DEFERRED COSTS

As of June 30, 2012 and December 31, 2011, the Company’s deferred costs were comprised of the following (in thousands):

	June 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	136,451	$	(53,224	)	$	83,227
Financing Costs	40,800		(9,107		)	31,693
Total	$	177,251	$	(62,331	)	$	114,920

	December 31, 2011
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	140,772	$	(50,990	)	$	89,782
Financing Costs	38,929		(13,349		)	25,580
Total	$	179,701	$	(64,339	)	$	115,362

During the three and six-month periods ended June 30, 2012, the Company capitalized internal direct leasing costs of $1.4 million and $2.7 million, respectively, and $1.7 million and $3.2 million during the three and six-month periods ended June 30, 2011, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

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Debt Obligations

6 Months Ended

Jun. 30, 2012

Debt Disclosure [Abstract]

DEBT OBLIGATIONS

DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at June 30, 2012 and December 31, 2011 (in thousands):

MORTGAGE DEBT:

Property / Location	June 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,713		$	56,538		7.25	%		May-13
Southpoint III	1,511			1,887			7.75	%		Apr-14
Tysons Corner	94,045			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,687			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	200,051			202,905			7.00	%		Sep-30
Cira South Garage	43,356			44,379			7.12	%		Sep-30
Principal balance outstanding	506,363			512,391
Plus: fair market value premiums (discounts), net	(1,149		)	(1,330		)
Total mortgage indebtedness	$	505,214		$	511,061
UNSECURED DEBT:
Former Term Loan	—			37,500			LIBOR + 0.80%		(b)	Feb-12
Former Revolving Credit Facility	—			275,500			LIBOR + 0.725%		(b)	Feb-12
New Revolving Credit Facility	—			—			LIBOR + 1.50%		(b)	Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			—			2.60	%	(b)	Feb-15
Four-Year Term Loan - Swapped to fixed	150,000			—			2.88	%	(b)	Feb-16
Four-Year Term Loan - Variable	100,000			—			LIBOR + 1.75%		(b)	Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			—			3.62	%	(b)	Feb-19
$300.0M 5.750% Guaranteed Notes due 2012	—			151,491			5.73	%	(c)	Apr-12
$250.0M 5.400% Guaranteed Notes due 2014	238,379			242,681			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	217,239			227,329			7.77	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	250,000			250,000			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.75	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.14	%		Apr-18
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	2,009,228			1,888,111
plus: original issue premium (discount), net	(4,601		)	(5,177		)
Total unsecured indebtedness	$	2,004,627		$	1,882,934
Total Debt Obligations	$	2,509,841		$	2,393,995

(a) This loan was assumed upon acquisition of the related property. The interest rate reflects the market rate at the time of acquisition.

(b) On February 1, 2012, the Company closed on a new $600.0 million four-year unsecured credit facility and three unsecured term loans totaling $600.0 million which consist of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. The Company used a portion of the net proceeds from the term loans to repay all balances outstanding under its Former Revolving Credit Facility and its former $183.0 million Bank Term Loan which were then retired prior to their scheduled June 29, 2012 maturity.

(c) Notes matured on April 1, 2012.

During the six-month periods ended June 30, 2012 and June 30, 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 6.72% and 6.59%, respectively.

During the six-months ended June 30, 2012, the Company repurchased $14.7 million of its outstanding unsecured Notes in a series of transactions that are summarized in the following table (in thousands):

Notes	Repurchase Amount		Principal		Loss			Deferred Financing Amortization
2012 5.750% Notes	$	309	$	301	$	(2	)	$	—
2014 5.400% Notes	4,630		4,302		(264		)	7
2015 7.500% Notes	11,537		10,090		(1,233		)	9
	$	16,476	$	14,693	$	(1,499	)	$	16

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 Company utilizes its unsecured new revolving credit facility (the "New Credit Facility") for potential borrowings and for general business purposes, including the acquisition, development and redevelopment of properties and the repayment of other debt. The maturity date of the New Credit Facility in place at June 30, 2012 is February 1, 2016. The per annum variable interest rate on any related outstanding balances, for which there were none at June 30, 2012, 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. As of June 30, 2012, the Company had no related borrowings, with $3.2 million in letters of credit outstanding, leaving $596.8 million of unused availability under the New Credit Facility. During the six-months ended June 30, 2011, the weighted-average interest rate on Former Credit Facility borrowings was 1.01%. As of June 30, 2011, the weighted average interest rate on the Former Credit Facility was 0.99%. There were no comparable rates as of June 30, 2012 due to the fact that the Company had no borrowings on its New Credit Facility during the current period.

The Company has the option to increase the amounts available to be advanced under the New Credit Facility, the $150.0 million three-year term loan, and the $250.0 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 New Credit Facility, the $150.0 million three-year term loan and the $250.0 million four-year term loan by one year, subject to payment of an extension fee and other customary conditions and limitations. The $150.0 million three-year term and the $250.0 million four-year term loans can be prepaid by the Company at any time without penalty. The $200.0 million seven-year term loan is subject to a declining prepayment penalty ranging from 3.00% a year after closing, 2.00% after two years, 1.00% after three years and without penalty thereafter.

The spread to LIBOR for LIBOR-based loans under the New Credit Facility and New Term Loans will depend 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, 175, 175 and 190 basis points under the New Credit Facility, the $150.0 million three-year term loan, the $250.0 million four-year term loan and the $200.0 million seven-year term loan, respectively. At the Company's option, loans 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 New 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, the rate on $300.0 million of notional principal for the other loans at rates in a range of 2.470% to 2.910% for periods of three to five years. All hedges commenced on February 1, 2012 and the rates are inclusive of the LIBOR spread based on the current investment grade rating. See Note 9 for details of the interest rate swaps entered into as of June 30, 2012.

The New Credit Facility and New Term Loans contain financial and operating covenants and restrictions. The Company was in compliance with all such restrictions and financial covenants as of June 30, 2012.

As of June 30, 2012, the Company’s aggregate scheduled principal payments of debt obligations, excluding amortization of discounts and premiums, were as follows (in thousands):

2012	$	6,444
2013	66,924
2014	250,612
2015	467,272
2016	596,609
Thereafter	1,127,730
Total principal payments	2,515,591
Net unamortized premiums/(discounts)	(5,750		)
Outstanding indebtedness	$	2,509,841

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Fair Value of Financial Instruments (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Properties	Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average Fair Value Interest Rate on Debt		3.237%
Fair Value of Financial Instruments (Textuals) [Abstract]
Gross deferred gain on sale of properties	$ 12.9
Number of properties sold (in properties)	2

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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012 Properties	Jun. 30, 2011	Jun. 30, 2012 Properties	Jun. 30, 2011	Dec. 31, 2011 Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
properties held for sale	11		11
Liabilities of Assets Held-for-sale	$ 878		$ 878		$ 0
Revenue:
Rents	115,032	114,995	229,271	230,328
Tenant Reimbursements	18,605	18,237	37,613	40,177
Gain (Loss) on Contract Termination	101	1,948	1,591	2,516
Other	966	1,336	2,498	2,359
Total revenue	137,576	139,249	276,987	280,866
Expenses:
Property operating expenses	37,906	39,115	77,363	83,235
Real estate taxes	14,134	13,786	28,228	27,495
Depreciation and amortization	49,331	55,710	98,880	105,214
Total operating expenses	108,714	116,007	219,114	231,094
Investment Income, Interest	1,841	421	2,324	862
Income from discontinued operations before gain on sale of interests in real estate	783	1,743	1,798	3,579
Net gain on disposition of discontinued operations	10,166	3,836	24,834	3,836
Income from discontinued operations	10,949	5,579	26,632	7,415
Number of properties sold (in properties)					2
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held-for-sale, Long Lived	52,990		52,990
Real Estate Investment Property, Accumulated Depreciation	(14,385)		(14,385)
Operating Real Estate Investment Properties Held for Sale, Net	38,605		38,605
Development in Process	36		36
Real Estate Investment Property, Net	38,641		38,641
Accounts Receivable, Net	1,374		1,374
Deferred Costs Related to Properties Held-for-Sale	1,137		1,137
Other Assets Related to Assets Held-for-Sale	298		298
Assets Held-for-sale, Current	41,450		41,450
Liabilities of Assets Held-for-sale	878		878
Discontinued Operations [Member]
Revenue:
Rents	2,003	5,620	6,113	11,292
Tenant Reimbursements	343	750	758	1,931
Gain (Loss) on Contract Termination	0		7
Other	86	5	89	2
Total revenue	2,432	6,375	6,967	13,225
Expenses:
Property operating expenses	594	1,581	1,701	3,639
Real estate taxes	217	707	726	1,446
Depreciation and amortization	840	2,344	2,744	4,561
Total operating expenses	1,651	4,632	5,171	9,646
Investment Income, Interest	2		2
Income from discontinued operations before gain on sale of interests in real estate	783	1,743	1,798	3,579
Net gain on disposition of discontinued operations	10,166	3,836	24,834	3,836
Income from discontinued operations	$ 10,949	$ 5,579	$ 26,632	$ 7,415
Number of properties sold (in properties)			3	7

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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Company's estimates of fair value differ from the carrying amounts
Mortgage notes payable, net of discounts, Carrying Amount	$ 506,363		$ 512,391
Mortgage notes payable, net of discounts, Fair Value	553,976		545,784
Unsecured notes payable, net of discounts, Carrying Amount	1,330,618		1,496,501
Unsecured notes payable, net of discounts, Fair Value	1,411,533		1,555,633
Variable rate debt instruments, Carrying Amount	678,610		391,610
Variable rate debt instruments, Fair Value	676,693		380,786
Notes receivable, Carrying Amount	7,226	[1]	31,157	[1]
Notes receivable, Fair Value	$ 8,785		$ 32,756

[1] For purposes of this disclosure, one of the notes is presented gross of the deferred gain of $12.9 million arising from the sale of two properties in 2009 accounted for under the accounting standard for installment sales.

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Debt Obligations (Tables)

6 Months Ended

Jun. 30, 2012

Debt Disclosure [Abstract]

Consolidated debt obligations

Property / Location	June 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,713		$	56,538		7.25	%		May-13
Southpoint III	1,511			1,887			7.75	%		Apr-14
Tysons Corner	94,045			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,687			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	200,051			202,905			7.00	%		Sep-30
Cira South Garage	43,356			44,379			7.12	%		Sep-30
Principal balance outstanding	506,363			512,391
Plus: fair market value premiums (discounts), net	(1,149		)	(1,330		)
Total mortgage indebtedness	$	505,214		$	511,061
UNSECURED DEBT:
Former Term Loan	—			37,500			LIBOR + 0.80%		(b)	Feb-12
Former Revolving Credit Facility	—			275,500			LIBOR + 0.725%		(b)	Feb-12
New Revolving Credit Facility	—			—			LIBOR + 1.50%		(b)	Feb-16
Three-Year Term Loan - Swapped to fixed	150,000			—			2.60	%	(b)	Feb-15
Four-Year Term Loan - Swapped to fixed	150,000			—			2.88	%	(b)	Feb-16
Four-Year Term Loan - Variable	100,000			—			LIBOR + 1.75%		(b)	Feb-16
Seven-Year Term Loan - Swapped to fixed	200,000			—			3.62	%	(b)	Feb-19
$300.0M 5.750% Guaranteed Notes due 2012	—			151,491			5.73	%	(c)	Apr-12
$250.0M 5.400% Guaranteed Notes due 2014	238,379			242,681			5.53	%		Nov-14
$250.0M 7.500% Guaranteed Notes due 2015	217,239			227,329			7.77	%		May-15
$250.0M 6.000% Guaranteed Notes due 2016	250,000			250,000			5.95	%		Apr-16
$300.0M 5.700% Guaranteed Notes due 2017	300,000			300,000			5.75	%		May-17
$325.0M 4.950% Guaranteed Notes due 2018	325,000			325,000			5.14	%		Apr-18
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	2,009,228			1,888,111
plus: original issue premium (discount), net	(4,601		)	(5,177		)
Total unsecured indebtedness	$	2,004,627		$	1,882,934
Total Debt Obligations	$	2,509,841		$	2,393,995

Summary of debt repurchases

Notes	Repurchase Amount		Principal		Loss			Deferred Financing Amortization
2012 5.750% Notes	$	309	$	301	$	(2	)	$	—
2014 5.400% Notes	4,630		4,302		(264		)	7
2015 7.500% Notes	11,537		10,090		(1,233		)	9
	$	16,476	$	14,693	$	(1,499	)	$	16

Schedule of principal payments of debt obligations

2012	$	6,444
2013	66,924
2014	250,612
2015	467,272
2016	596,609
Thereafter	1,127,730
Total principal payments	2,515,591
Net unamortized premiums/(discounts)	(5,750		)
Outstanding indebtedness	$	2,509,841

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Investment in Unconsolidated Ventures (Narrative) (Details)	6 Months Ended
	Jun. 30, 2012 Properties Room Real_Estate_Ventures Buildings sqft A
Investment in Unconsolidated Ventures (Textuals) [Abstract]
Number of unconsolidated Real Estate Ventures	18
Number of real estate ventures that owns 51 office buildings	15
Number of office buildings owned by 15 Real Estate Ventures	51
Net rentable square feet of 51 office buildings owned the 15 Real Estate Ventures	6,500,000
Number of real estate ventures that owns undeveloped land	2
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	4
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%

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Beneficiaries Equity of the Parent Company

6 Months Ended

Jun. 30, 2012

Equity [Abstract]

BENEFICIARIES' EQUITY OF THE PARENT COMPANY

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following table details 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):

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Net income from continuing operations attributable to non-controlling interests	169			169			276			276
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(9,212		)	(9,212		)	(13,656		)	(13,656		)
Income from discontinued operations	10,949			10,949			5,579			5,579
Discontinued operations attributable to non-controlling interests	(200		)	(200		)	(111		)	(111		)
Discontinued operations attributable to common shareholders	10,749			10,749			5,468			5,468
Net income (loss) attributable to common shareholders	$	1,537		$	1,537		$	(8,188	)	$	(8,188	)
Denominator
Weighted-average shares outstanding	143,300,637			143,300,637			135,342,538			135,342,538
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.07	)	$	(0.07	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common shareholders	0.08			0.08			0.04			0.04
Net income (loss) attributable to common shareholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Net income (loss) from continuing operations attributable to non-controlling interests	322			322			364			364
Amount allocable to unvested restricted shareholders	(191		)	(191		)	(263		)	(263		)
Preferred share dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(17,500		)	(17,500		)	(18,034		)	(18,034		)
Income from discontinued operations	26,632			26,632			7,415			7,415
Discontinued operations attributable to non-controlling interests	(487		)	(487		)	(148		)	(148		)
Discontinued operations attributable to common shareholders	26,145			26,145			7,267			7,267
Net income (loss) attributable to common shareholders	$	8,645		$	8,645		$	(10,767	)	$	(10,767	)
Denominator
Weighted-average shares outstanding	143,060,796			143,060,796			134,962,093			134,962,093
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common shareholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common shareholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

Redeemable common limited partnership units totaling 2,657,721 and 9,809,759 as of June 30, 2012 and 2011, respectively, were excluded from the diluted earnings per share computations because their effect would have been anti-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 six months ended June 30, 2012 and 2011, earnings representing nonforfeitable dividends as noted in the table above 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 April 11, 2012, the Parent Company closed a registered public offering of 4,000,000 shares of its 6.90% Series E Cumulative Redeemable Preferred Shares at a price to the public of $25.00 per share. Dividends on the 6.90% Series E Cumulative Redeemable Preferred Shares will be paid quarterly in arrears on or about the 15th day of each January, April, July, and October, commencing July 15, 2012, at a rate per annum of 6.90% of the liquidation value of $25.00 per share (equivalent to $1.725 per share per annum). Net proceeds from the offering totaled approximately $96.3 million, after deducting the underwriting discount and our estimated expenses.

On May 3, 2012, the Parent Company used a portion of the net proceeds from the aforementioned offering of Series E Cumulative Redeemable Preferred Shares to redeem all 2,000,000 shares of its previously outstanding 7.50% Series C Cumulative Redeemable Preferred Shares at a redemption price of $50.0 million plus $0.2 million of accrued dividends through the redemption date. The Company used the remaining proceeds from the aforementioned offering for corporate purposes. In accordance with GAAP, the Company also recognized $2.1 million of redemption costs as a reduction in net earnings to arrive at net income applicable to common shares for the three and six-month periods ended June 30, 2012. These costs are listed above and shown within the Company's consolidated statements of operations as "Preferred share redemption charge". There were no comparable charges for the three and six-month periods ended June 30, 2011.

On May 31, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which was paid on July 19, 2012 to shareholders of record as of July 5, 2012. On May 31, 2012, the Parent Company declared distributions on its Series D Preferred Shares and Series E Preferred Shares to holders of record as of June 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on July 16, 2012 to holders of Series D Preferred Shares and Series E Preferred Shares totaled $1.1 million and $1.8 million, respectively.

In March 2010, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which the Parent Company may sell up to an aggregate amount of 15,000,000 common shares until March 10, 2013. The 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 as determined by the Company, including market conditions, the trading price of its common shares 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. During the six-month period ended June 30, 2012, the Parent Company did not sell any shares under the Offering Program. During the six-month period ended June 30, 2011, the Parent Company sold 679,285 shares under this program at an average sales price of $12.18 per share resulting in net proceeds of $8.0 million. The Parent Company contributed the net proceeds from the sale of its shares to the Operating Partnership in exchange for the issuance of 679,285 common partnership units to the Parent Company. The Operating Partnership used the net proceeds from the sales contributed by the Parent Company to repay balances on its Credit Facility and for general corporate purposes. From the inception of the Offering Program in March 2010 through June 30, 2012, the Parent Company had sold 6,421,553 shares under this program at an average sales price of $12.50 per share, resulting in 8,578,447 remaining shares available for sale.

Common Share Repurchases

The Parent Company maintains a share repurchase program pursuant to which the Parent Company is authorized to repurchase its common shares from time to time. The Parent Company’s Board of Trustees initially authorized this program in 1998 and has periodically replenished capacity under the program. On May 2, 2006 the Board of Trustees restored capacity to 3.5 million common shares.

The Parent Company did not repurchase any shares under the share repurchase program during the six-month period ended June 30, 2012. As of June 30, 2012, the Parent Company may purchase an additional 0.5 million 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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Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

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 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.

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 17 to 91 years. Minimum future rental payments on non-cancelable leases at June 30, 2012 are as follows (in thousands):

2012 (six months remaining)	$	909
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,983

One of the land leases for a property provides for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the property 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.

The Company acquired ground tenancy rights under a long term ground lease agreement related to its acquisition of an office building in Philadelphia, Pennsylvania on August 12, 2011. The annual rental payments under this ground lease is equal to a percentage of the NOI generated by the property. The Company has not included the amounts in the table above since such amounts are not fixed or determinable.

The Company also acquired ground tenancy rights under a long term ground lease agreement through its acquisition of Three Logan Square on August 5, 2010. The annual rental payment under this ground lease is ten dollars through August 2022 which is when the initial term of the ground lease is scheduled to end. After the initial term, the Company has the option to renew the lease until 2091. The Company also has the option to purchase the land at fair market value after providing a written notice to the owner. The annual rental payment after 2022 will be adjusted at the lower of $3.0 million or the prevailing market rent at that time until 2030. Subsequent to 2030, the annual rental payment will be adjusted at the lower of $4.0 million or the prevailing market rent at the time until 2042 and at fair market value until 2091. The Company believes that based on conditions as of the date the Company acquired its rights under the lease (August 5, 2010), the lease will reset to market after the initial term. Using the estimated fair market rent as of the date of the acquisition over the extended term of the ground lease (assuming the purchase option is not exercised), the future payments will aggregate to $27.4 million. The Company has not included the amounts in the table above since such amounts are not fixed or determinable.

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 June 30, 2012, the Company had a balance of $1.4 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 expects to enter into a settlement agreement with the IRS which will not result in a material tax liability for the Company. Assuming that the settlement agreement is finalized as expected, the contributor of partnership interests in the 2004 transaction has agreed not to assert a claim against the Company under the tax protection agreement entered into as part of the transaction.

As part of the Company’s 2006 merger with Prentiss Properties Trust, 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 for periods up to 15 years from the date of the TRC acquisition as follows at June 30, 2012: 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.

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 will be required to provide the prior owner an opportunity to guaranty a qualifying replacement debt. These debt maintenance agreements may limit the Company’s ability to refinance indebtedness on terms that will be favorable to the Company.

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.

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 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 remaining compliance periods for its tax credit arrangements runs 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.

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Real Estate Investments (Gross Carrying Value of Company's Properties) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Gross carrying value of rental properties
Land	$ 649,690	$ 677,891
Building and improvements	3,522,597	3,631,388
Tenant improvements	466,760	483,801
Rental properties	$ 4,639,047	$ 4,793,080

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Segment information

	Pennsylvania Suburbs		Philadelphia CBD		Metropolitan, D.C.		New Jersey/Delaware		Richmond, Virginia		Austin, Texas		California		Corporate			Total
As of June 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,167,390	$	955,563	$	1,182,895	$	545,241	$	307,932	$	258,924	$	221,102	$	—		$	4,639,047
Construction-in-progress															57,420			57,420
Land inventory															109,564			109,564
As of December 31, 2011:
Real estate investments, at cost:
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
For the three-months ended June 30, 2012:
Total revenue	$	36,934	$	31,911	$	26,967	$	20,287	$	8,902	$	8,188	$	4,831	$	(444	)	$	137,576
Property operating expenses, real estate taxes and third party management expenses	12,711		11,965		10,454		8,932		3,471		3,612		2,488		(329		)	53,304
Net operating income	$	24,223	$	19,946	$	16,513	$	11,355	$	5,431	$	4,576	$	2,343	$	(115	)	$	84,272
For the three-months ended June 30, 2011:
Total revenue	$	37,159	$	30,573	$	30,309	$	19,832	$	9,278	$	7,637	$	4,781	$	(320	)	$	139,249
Property operating expenses, real estate taxes and third party management expenses	12,825		11,203		11,486		9,516		3,614		3,412		2,563		(212		)	54,407
Net operating income	$	24,334	$	19,370	$	18,823	$	10,316	$	5,664	$	4,225	$	2,218	$	(108	)	$	84,842
For the six-months ended June 30, 2012:
Total revenue	$	75,039	$	65,061	$	53,403	$	40,889	$	17,937	$	15,681	$	9,800	$	(823	)	$	276,987
Property operating expenses, real estate taxes and third party management expenses	26,055		24,650		20,520		18,668		7,113		7,009		4,858		(768		)	108,105
Net operating income	$	48,984	$	40,411	$	32,883	$	22,221	$	10,824	$	8,672	$	4,942	$	(55	)	$	168,882
For the six-months ended June 30, 2011:
Total revenue	$	75,136	$	62,423	$	60,640	$	39,811	$	18,076	$	15,749	$	9,584	$	(553	)	$	280,866
Property operating expenses, real estate taxes and third party management expenses	28,617		23,423		23,135		20,603		7,003		6,506		5,004		(545		)	113,746
Net operating income	$	46,519	$	39,000	$	37,505	$	19,208	$	11,073	$	9,243	$	4,580	$	(8	)	$	167,120

Reconciliation of consolidated net operating income

	Three-month periods ended June 30,						Six-month periods ended June 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,272		$	84,842		$	168,882		$	167,120
Less:
Interest expense	(32,981		)	(34,738		)	(67,125		)	(67,131		)
Deferred financing costs	(1,261		)	(1,070		)	(2,572		)	(1,998		)
Depreciation and amortization	(49,331		)	(55,710		)	(98,880		)	(105,214		)
Administrative expenses	(6,079		)	(5,890		)	(12,129		)	(12,134		)
Plus:
Interest income	1,841			421			2,324			862
Interest expense - financing obligation	(196		)	—			(378		)	—
Equity in income of real estate ventures	838			1,088			882			2,321
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on early extinguishment of debt	(1,250		)	(756		)	(1,498		)	(756		)
Loss from continuing operations	(4,147		)	(11,813		)	(10,494		)	(14,139		)
Income from discontinued operations	10,949			5,579			26,632			7,415
Net income (loss)	$	6,802		$	(6,234	)	$	16,138		$	(6,724	)

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income (loss)	$ 6,802	$ (6,234)	$ 16,138	$ (6,724)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	(10,650)	0	(10,623)	(613)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76	51	124	74
Unrealized loss on available-for-sale securities	(65)	0	(65)	0
Total comprehensive income (loss)	(10,639)	51	(10,564)	(539)
Comprehensive income (loss)	(3,837)	(6,183)	5,574	(7,263)
Comprehensive (income) loss attributable to non-controlling interest	163	164	29	226
Comprehensive income (loss) attributable to Brandywine Realty Trust	(3,674)	(6,019)	5,603	(7,037)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)	6,802	(6,234)	16,138	(6,724)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	(10,650)	0	(10,623)	(613)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76	51	124	74
Unrealized loss on available-for-sale securities	(65)	0	(65)	0
Total comprehensive income (loss)	(10,639)	51	(10,564)	(539)
Comprehensive income (loss) attributable to Brandywine Realty Trust	$ (3,837)	$ (6,183)	$ 5,574	$ (7,263)

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Organization of The Parent Company and The Operating Partnership

6 Months Ended

Jun. 30, 2012

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 June 30, 2012, owned a 98.2% 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 June 30, 2012, the Company owned 230 properties, consisting of 204 office properties, 20 industrial facilities, five mixed-use properties and one development property (collectively, the “Properties”) containing an aggregate of approximately 24.9 million net rentable square feet. In addition, as of June 30, 2012, the Company owned economic interests in 18 unconsolidated real estate ventures that contain approximately 6.5 million net rentable square feet (collectively, the “Real Estate Ventures”). As of June 30, 2012, the Company also owned 444 acres of undeveloped land, and held options to purchase approximately 52 additional acres of undeveloped land. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern and Central New Jersey; Richmond, Virginia; Wilmington, Delaware; Austin, Texas and Oakland, Concord, Carlsbad and Rancho Bernardo, California.

The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of June 30, 2012, the management company subsidiaries were managing properties containing an aggregate of approximately 32.3 million net rentable square feet, of which approximately 24.9 million net rentable square feet related to Properties owned by the Company and approximately 7.4 million net rentable square feet related to properties owned by third parties and Real Estate Ventures.

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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Consolidated debt obligations
Plus: premiums/(discounts), net	$ (5,750)
Total mortgage indebtedness	505,214		511,061
Total Debt Obligations	2,509,841		2,393,995
Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	506,363		512,391
Plus: premiums/(discounts), net	(1,149)		(1,330)
Total mortgage indebtedness	505,214		511,061
Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	2,009,228		1,888,111
Plus: premiums/(discounts), net	(4,601)		(5,177)
Total unsecured indebtedness	2,004,627		1,882,934
Bank Term Loan [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	0		37,500
Effective interest rate	LIBOR + 0.80%	[1]
Debt Instrument Maturity Dates	Feb-12
Debt instrument, basis spread on variable rate	0.80%
Former Revolving Credit Facility [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	0		275,500
Effective interest rate	LIBOR + 0.725%	[1]
Debt Instrument Maturity Dates	Feb-12
Debt instrument, basis spread on variable rate	0.725%
New Revolving Credit Facility [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	0		0
Effective interest rate	LIBOR + 1.50%	[1]
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		0
Effective interest rate	2.60%	[1]
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
Four Year Term Loan [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Debt instrument, basis spread on variable rate	1.75%
Debt Instrument, Term	4 years
Option to extend Term Loan	1 year
Four-Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	150,000		0
Effective interest rate	2.88%	[1]
Debt Instrument Maturity Dates	Feb-16
Four-Year Term Loan - Variable [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	100,000		0
Effective interest rate	LIBOR + 1.75%	[1]
Debt Instrument Maturity Dates	Feb-16
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	200,000		0
Effective interest rate	3.62%	[1]
Debt Instrument Maturity Dates	Feb-19
Debt instrument, basis spread on variable rate	1.90%
Debt Instrument, Term	7 years
$300.0M 5.750% Guaranteed Notes due 2012 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	0		151,491
Effective interest rate	5.73%
Debt Instrument Maturity Dates	Apr-12
Debt instrument stated interest rate	5.75%
$250.0M 5.400% Guaranteed Notes due 2014 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	238,379		242,681
Effective interest rate	5.53%
Debt Instrument Maturity Dates	Nov-14
Debt instrument stated interest rate	5.40%
$250.0M 7.500% Guaranteed Notes due 2015 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	217,239		227,329
Effective interest rate	7.77%
Debt Instrument Maturity Dates	May-15
Debt instrument stated interest rate	7.50%
$250.0M 6.000% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	250,000		250,000
Effective interest rate	5.95%
Debt Instrument Maturity Dates	Apr-16
Debt instrument stated interest rate	6.00%
$300.0M 5.700% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	300,000		300,000
Effective interest rate	5.75%
Debt Instrument Maturity Dates	May-17
Debt instrument stated interest rate	5.70%
$325.0M 4.950% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	325,000		325,000
Effective interest rate	5.14%
Debt Instrument Maturity Dates	Apr-18
Debt instrument stated interest rate	4.95%
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	27,062		27,062
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		25,774
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		25,774
Effective interest rate	3.09%
Debt Instrument Maturity Dates	Jul-35
Newtown Square/Berwyn Park/Libertyview [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	55,713		56,538
Effective interest rate	7.25%
Debt Instrument Maturity Dates	May-13
Southpoint III [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	1,511		1,887
Effective interest rate	7.75%
Debt Instrument Maturity Dates	Apr-14
Tysons Corner [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	94,045		94,882
Effective interest rate	5.36%	[2]
Debt Instrument Maturity Dates	Aug-15
Two Logan Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	89,687		89,800
Effective interest rate	7.57%
Debt Instrument Maturity Dates	Apr-16
Fairview Eleven Tower [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	22,000		22,000
Effective interest rate	4.25%
Debt Instrument Maturity Dates	Jan-17
IRS Philadelphia Campus [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	200,051		202,905
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	$ 43,356		$ 44,379
Effective interest rate	7.12%
Debt Instrument Maturity Dates	Sep-30

[1] On February 1, 2012, the Company closed on a new $600.0 million four-year unsecured credit facility and three unsecured term loans totaling $600.0 million which consist of a $150.0 million three-year loan, a $250.0 million four-year loan and a $200.0 million seven-year loan. The Company used a portion of the net proceeds from the term loans to repay all balances outstanding under its Former Revolving Credit Facility and its former $183.0 million Bank Term Loan which were then retired prior to their scheduled June 29, 2012 maturity.

[2] This loan was assumed upon acquisition of the related property. The interest rate reflects the market rate at the time of acquisition.

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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended			6 Months Ended		28 Months Ended	0 Months Ended	6 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	May 02, 2006	May 03, 2012 7.50% Series C Preferred Shares	Jun. 30, 2012 7.50% Series C Preferred Shares	Jul. 16, 2012 7.375% Series D Preferred Shares	Jun. 30, 2012 7.375% Series D Preferred Shares	Jul. 19, 2012 7.375% Series D Preferred Shares Dividend Paid	Jul. 05, 2012 7.375% Series D Preferred Shares Dividend Paid	Jun. 30, 2012 Offering Program [Member]	Jun. 30, 2011 Offering Program [Member]	Jun. 30, 2012 Offering Program [Member]	Jul. 16, 2012 6.90% Series E Preferred Stock [Member]	Jun. 30, 2012 6.90% Series E Preferred Stock [Member]	Apr. 11, 2012 6.90% Series E Preferred Stock [Member]	Jun. 30, 2012 6.90% Series E Preferred Stock [Member]	Jun. 30, 2012 Subsidiaries [Member]	Jun. 30, 2011 Subsidiaries [Member]	Jun. 30, 2012 Subsidiaries [Member]	Jun. 30, 2011 Subsidiaries [Member]	Dec. 31, 2011 Subsidiaries [Member]	Jul. 19, 2012 Subsidiaries [Member]	Jul. 05, 2012 Subsidiaries [Member]	Jun. 30, 2012 Subsidiaries [Member] 7.50% Series C Preferred Shares	Jun. 30, 2012 Subsidiaries [Member] 6.90% Series E Preferred Stock [Member]	Dec. 31, 2011 Subsidiaries [Member] 6.90% Series E Preferred Stock [Member]
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value			$ (47,910,000)			$ 50,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock			96,240,000	0												96,300,000					96,240,000	0
Stock Redeemed or Called During Period, Shares						2,000,000
Percentage of Preferential return									7.375%							6.90%		6.90%			6.90%		0.00%				7.375%	7.375%
Dividends paid for preferred shares			5,047,000	3,996,000			200,000	1,100,000							1,800,000
Redemption Premium	2,090,000	0	2,090,000	0															2,090,000	0	2,090,000	0				(2,100,000)
Beneficiaries Equity of The Parent Company (Textuals) [Abstract]
Antidilutive securities excluded from computation of earnings per share			2,657,721	9,809,759
Preferred Stock, Shares Issued																	4,000,000	4,000,000	4,000,000		4,000,000		0				2,300,000	2,300,000
Distribution Declared per common partnership unit										$ 0.15														$ 0.15
Shares authorized for Equity Offering Program												15,000,000
Maximum percentage of Gross sale price per share, compensation to sales agents												2.00%
Issuance of Common Shares of Beneficial Interest, shares													679,285
Average sales price per share													$ 12.18	$ 12.50
Issuance of Common Shares of Beneficial Interest				8,272,000									8,000,000
Common partnership units issued to the parent company related to redemption													679,285
Number of shares sold by the company												6,421,553
Remaining shares available for sales												8,578,447
Common shares capacity restored					3,500,000
Additional shares Expected to be purchased under program	500,000		500,000
Preferred Stock, Liquidation Preference Per Share																$ 25	$ 25
Preferred Stock, per share per annum																$ 1.725
Dividends Payable, Amount											$ 21,600,000														$ 21,600,000

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Subsequent Events

6 Months Ended

Jun. 30, 2012

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

On July 18, 2012, the Company sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, for a sales price of $52.7 million. These properties, collectively known as the Oaklands Corporate Center, have been classified as held-for-sale within the Company's consolidated financial statements. Please see Note 10 for further discussion.

The Company has evaluated subsequent events through the date the financial statements were issued.

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Share Based and Deferred Compensation (Details Textuals) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Stock Option [Member]	Jun. 30, 2011 Stock Option [Member]	Jun. 30, 2012 Stock Option [Member] Y	Jun. 30, 2011 Stock Option [Member]	Jun. 30, 2012 Restricted Share Awards [Member]	Jun. 30, 2011 Restricted Share Awards [Member]	Jun. 30, 2012 Restricted Share Awards [Member] Age Y	Jun. 30, 2011 Restricted Share Awards [Member]	Jun. 30, 2012 Restricted Performance Share Units Plan [Member]	Jun. 30, 2011 Restricted Performance Share Units Plan [Member]	Jun. 30, 2012 Restricted Performance Share Units Plan [Member]	Jun. 30, 2011 Restricted Performance Share Units Plan [Member]	Apr. 02, 2009 Restricted Performance Share Units Plan [Member]	Jun. 30, 2012 Employee Share Purchase Plan [Member]	Jun. 30, 2011 Employee Share Purchase Plan [Member]	Jun. 30, 2012 Employee Share Purchase Plan [Member]	Jun. 30, 2011 Employee Share Purchase Plan [Member]	Jun. 30, 2012 Deferred Compensation Plan [Member]	Jun. 30, 2011 Deferred Compensation Plan [Member]	Mar. 01, 2012 Executive Officer [Member] Restricted Share Awards [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]	Mar. 04, 2010 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	3,483,537		3,483,537		3,599,672	3,483,537		3,483,537
Unvested options						671,783		671,783
Unrecognized compensation expenses						$ 1,600,000		$ 1,600,000		$ 4,700,000		$ 4,700,000
Weighted average period over which options will be recognized								1.3				2.6
Stock-based compensation expense, capitalized	500,000	400,000	900,000	700,000		400,000	400,000	700,000	700,000	200,000	100,000	300,000	300,000	200,000	100,000	400,000	200,000
Recognized compensation expense awards nominal amounts capitalized						100,000	100,000	200,000	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												three to seven years from the initial grant date				3 years
Compensation expense recognized	1,900,000	1,600,000	3,600,000	3,300,000						800,000	800,000	1,500,000	1,600,000	700,000	500,000	1,300,000	800,000				100,000	100,000
Vesting Period, Minimum												3 Years
Vesting Period, Maximum												7 Years
Aggregate share-based awards awarded to executives																			1,250,000		1,250,000				194,858	262,713	123,107	119,766
Measurement period index percentage, minimum																										50.00%
Measurement period index percentage remaining amount compared to total shareholder return of Real Estate Investment Trusts within proxy peer group																										50.00%
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
Accumulated Service Period For Voluntary Termination												15 years				15 years
Maximum number of shares to be delivered at the end of the measurement period relative to the total shareholder return																equal a certain percentage (not to exceed 200%) of the participant's base units
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Delivered																		372,102
Maximum percentage of the participant's base units																200.00%
Fair value of awards on the grant date																4,200,000	2,000,000
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
Purchase price of shares purchased under ESPP																			$ 100,000	$ 100,000	$ 200,000	$ 200,000
Deferred Compensation Arrangement With Individual Increase In Compensation Expense																							600,000	400,000
Deferred Compensation Arrangement With Individual Decrease In Compensation Expense																							$ 400,000	$ 400,000
Number of shares to be issued under deferred compensation plan included in total shares outstanding																							300,000	300,000

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Beneficiaries Equity of The Parent Company (Tables)

6 Months Ended

Jun. 30, 2012

Equity [Abstract]

Earnings per Share (EPS)

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following table details 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):

	Three-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(4,147	)	$	(4,147	)	$	(11,813	)	$	(11,813	)
Net income from continuing operations attributable to non-controlling interests	169			169			276			276
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(3,049		)	(3,049		)	(1,998		)	(1,998		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(9,212		)	(9,212		)	(13,656		)	(13,656		)
Income from discontinued operations	10,949			10,949			5,579			5,579
Discontinued operations attributable to non-controlling interests	(200		)	(200		)	(111		)	(111		)
Discontinued operations attributable to common shareholders	10,749			10,749			5,468			5,468
Net income (loss) attributable to common shareholders	$	1,537		$	1,537		$	(8,188	)	$	(8,188	)
Denominator
Weighted-average shares outstanding	143,300,637			143,300,637			135,342,538			135,342,538
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.07	)	$	(0.07	)	$	(0.10	)	$	(0.10	)
Discontinued operations attributable to common shareholders	0.08			0.08			0.04			0.04
Net income (loss) attributable to common shareholders	$	0.01		$	0.01		$	(0.06	)	$	(0.06	)

	Six-month periods ended June 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(10,494	)	$	(10,494	)	$	(14,139	)	$	(14,139	)
Net income (loss) from continuing operations attributable to non-controlling interests	322			322			364			364
Amount allocable to unvested restricted shareholders	(191		)	(191		)	(263		)	(263		)
Preferred share dividends	(5,047		)	(5,047		)	(3,996		)	(3,996		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(17,500		)	(17,500		)	(18,034		)	(18,034		)
Income from discontinued operations	26,632			26,632			7,415			7,415
Discontinued operations attributable to non-controlling interests	(487		)	(487		)	(148		)	(148		)
Discontinued operations attributable to common shareholders	26,145			26,145			7,267			7,267
Net income (loss) attributable to common shareholders	$	8,645		$	8,645		$	(10,767	)	$	(10,767	)
Denominator
Weighted-average shares outstanding	143,060,796			143,060,796			134,962,093			134,962,093
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.12	)	$	(0.12	)	$	(0.13	)	$	(0.13	)
Discontinued operations attributable to common shareholders	0.18			0.18			0.05			0.05
Net income (loss) attributable to common shareholders	$	0.06		$	0.06		$	(0.08	)	$	(0.08	)

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Non Controlling Interests in The Parent Company

6 Months Ended

Jun. 30, 2012

Noncontrolling Interest [Abstract]

NON-CONTROLLING INTERESTS IN THE PARENT COMPANY

NON-CONTROLLING INTERESTS IN THE PARENT COMPANY

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.

As of June 30, 2012 and December 31, 2011, the aggregate book value of the non-controlling interests associated with the redeemable common limited partnership interests in the accompanying consolidated balance sheet of the Parent Company was $31.6 million and $33.1 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 $32.8 million and $25.6 million, respectively.