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 September 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

1

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 143,443,501 Common Shares of Beneficial Interest, par value $0.01 per share of Brandywine Realty Trust, were outstanding as of October 26, 2012.

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EXPLANATORY NOTE

This report combines the quarterly reports on Form 10-Q for the period ended September 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 September 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

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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 September 30, 2012 and December 31, 2011	7
Consolidated Statements of Operations for the three and nine- month periods ended September 30, 2012 and 2011	8
Consolidated Statements of Comprehensive Income for the three and nine- month periods ended September 30, 2012 and 2011	9
Consolidated Statements of Equity for the nine-month periods ended September 30, 2012 and 2011	10
Consolidated Statements of Cash Flows for the nine-month periods ended September 30, 2012 and 2011	12
Brandywine Operating Partnership, L.P.
Financial Statements of Brandywine Operating Partnership, L.P. (unaudited)
Consolidated Balance Sheets as of September 30, 2012 and December 31, 2011	13
Consolidated Statements of Operations for the three and nine- month periods ended September 30, 2012 and 2011	14
Consolidated Statements of Comprehensive Income for the three and nine- month periods ended September 30, 2012 and 2011	15
Consolidated Statements of Cash Flows for the nine-month periods ended September 30, 2012 and 2011	16
Notes to Unaudited Consolidated Financial Statements	17
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	47
Item 3. Quantitative and Qualitative Disclosures about Market Risk	68
Item 4. Controls and Procedures	68
PART II — OTHER INFORMATION
Item 1. Legal Proceedings	69
Item 1A. Risk Factors	69
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	69
Item 3. Defaults Upon Senior Securities	69
Item 4. Mine Safety Disclosures	69
Item 5. Other Information	70
Item 6. Exhibits	70
Signatures	71
Exhibit 10.1
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

5

 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.

6

PART I — FINANCIAL INFORMATION

Item 1. — Financial Statements

BRANDYWINE REALTY TRUST

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share information)

	September 30, 2012			December 31, 2011
	(unaudited)
ASSETS
Real estate investments:
Rental properties	$	4,660,289		$	4,793,080
Accumulated depreciation	(925,342		)	(865,710		)
Operating real estate investments, net	3,734,947			3,927,370
Construction-in-progress	43,449			25,083
Land inventory	95,500			109,008
Total real estate investments, net	3,873,896			4,061,461
Cash and cash equivalents	241,616			410
Accounts receivable, net	13,394			14,718
Accrued rent receivable, net	117,306			108,101
Investment in real estate ventures, at equity	179,037			115,807
Deferred costs, net	119,182			115,362
Intangible assets, net	52,575			70,515
Notes receivable	7,226			18,186
Other assets	62,494			53,158
Total assets	$	4,666,726		$	4,557,718
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	$	502,123		$	511,061
Unsecured credit facility	—			275,500
Unsecured term loans	600,000			37,500
Unsecured senior notes, net of discounts	1,404,466			1,569,934
Accounts payable and accrued expenses	80,554			69,929
Distributions payable	24,820			23,895
Deferred income, gains and rent	80,748			99,569
Acquired lease intangibles, net	29,824			35,106
Other liabilities	59,982			45,528
Total liabilities	2,782,517			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; 143,438,501 and 142,690,755 issued and outstanding in 2012 and 2011, respectively	1,432			1,424
Additional paid-in capital	2,828,722			2,776,197
Deferred compensation payable in common shares	5,352			5,631
Common shares in grantor trust, 290,745 in 2012 and 292,646 in 2011	(5,352		)	(5,631		)
Cumulative earnings	510,093			477,338
Accumulated other comprehensive loss	(20,456		)	(6,079		)
Cumulative distributions	(1,467,058		)	(1,392,332		)
Total Brandywine Realty Trust’s equity	1,852,796			1,856,591
Non-controlling interests	31,413			33,105
Total equity	1,884,209			1,889,696
Total liabilities and equity	$	4,666,726		$	4,557,718

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

7

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF OPERATIONS

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

	For the three-month periods ended						For the nine-month periods ended
	September 30,						September 30,
	2012			2011			2012			2011
Revenue:
Rents	$	113,989		$	116,251		$	343,260		$	346,579
Tenant reimbursements	20,695			19,010			58,308			59,187
Termination fees	931			157			2,522			2,673
Third party management fees, labor reimbursement and leasing	3,007			3,028			9,021			8,514
Other	1,761			955			4,259			3,314
Total revenue	140,383			139,401			417,370			420,267
Operating Expenses:
Property operating expenses	40,705			40,788			118,068			124,023
Real estate taxes	14,064			13,204			42,292			40,699
Third party management expenses	1,298			1,379			3,812			4,395
Depreciation and amortization	48,738			51,943			147,618			157,157
General and administrative expenses	6,080			6,177			18,209			18,311
Total operating expenses	110,885			113,491			329,999			344,585
Operating income	29,498			25,910			87,371			75,682
Other Income (Expense):
Interest income	311			523			2,635			1,385
Historic tax credit transaction income	11,840			12,026			11,840			12,026
Interest expense	(32,620		)	(32,346		)	(99,745		)	(99,477		)
Interest expense — amortization of deferred financing costs	(1,218		)	(1,846		)	(3,790		)	(3,844		)
Interest expense — financing obligation	(230		)	—			(608		)	—
Equity in income of real estate ventures	500			418			1,382			2,739
Net gain on sale of interests in real estate	—			—			—			2,791
Loss on real estate venture formation	(950		)	—			(950		)	—
Gain (loss) on early extinguishment of debt	(51		)	176			(1,549		)	(580		)
Income (loss) from continuing operations	7,080			4,861			(3,414		)	(9,278		)
Discontinued operations:
Income from discontinued operations	69			1,750			1,867			5,329
Net gain on disposition of discontinued operations	9,940			—			34,774			3,836
Total discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	17,089			6,611			33,227			(113		)
Net (income) loss from discontinued operations attributable to non-controlling interests — LP units	(182		)	(86		)	(669		)	(234		)
Net (income) loss attributable to non-controlling interests — LP units	(78		)	(276		)	244			88
Net (income) loss attributable to non-controlling interests	(260		)	(362		)	(425		)	(146		)
Net income (loss) attributable to Brandywine Realty Trust	16,829			6,249			32,802			(259		)
Distribution to Preferred Shares	(2,785		)	(1,998		)	(7,832		)	(5,994		)
Preferred share redemption charge	—			—			(2,090		)	—
Amount allocated to unvested restricted shareholders	(95		)	(121		)	(286		)	(384		)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$	13,949		$	4,130		$	22,594		$	(6,637	)
Basic income (loss) per Common Share:
Continuing operations	$	0.03		$	0.02		$	(0.09	)	$	(0.12	)
Discontinued operations	0.07			0.01			0.25			0.07
	$	0.10		$	0.03		$	0.16		$	(0.05	)
Diluted income (loss) per Common Share:
Continuing operations	$	0.03		$	0.02		$	(0.09	)	$	(0.12	)
Discontinued operations	0.07			0.01			0.25			0.07
	$	0.10		$	0.03		$	0.16		$	(0.05	)
Basic weighted average shares outstanding	143,424,485			135,562,487			143,182,911			135,164,424
Diluted weighted average shares outstanding	144,128,010			136,841,451			143,182,911			135,164,424
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	$	7,002		$	4,585		$	(3,170	)	$	(9,190	)
Income from discontinued operations	9,827			1,664			35,972			8,931
Net income (loss)	$	16,829		$	6,249		$	32,802		$	(259	)

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

8

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited, in thousands)

	For the three-month periods ended						For the nine-month periods ended
	September 30,						September 30,
	2012			2011			2012			2011
Net income (loss)	$	17,089		$	6,611		$	33,227		$	(113	)
Comprehensive income (loss):
Unrealized loss on derivative financial instruments	(4,222		)	—			(14,780		)	(613		)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76			53			200			126
Unrealized gain on available-for-sale securities	65			—			—			—
Total comprehensive income (loss)	(4,081		)	53			(14,580		)	(487		)
Comprehensive income (loss)	13,008			6,664			18,647			(600		)
Comprehensive (income) loss attributable to non-controlling interest	(186		)	(365		)	(158		)	(139		)
Comprehensive income (loss) attributable to Brandywine Realty Trust	$	12,822		$	6,299		$	18,489		$	(739	)

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

9

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY

For the Nine-Month Periods Ended September 30, 2012 and 2011

(unaudited, in thousands, except number of shares)

September 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																								32,804									423			33,227
Comprehensive loss																											(14,377		)				(203		)	(14,580		)
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					1		149											(49		)							(332		)	(231		)
Bonus Share Issuance						35,703							387																							387
Vesting of Restricted Shares						280,851			9,036		3		(1,294		)																					(1,291		)
Restricted Share Amortization													2,138																							2,138
Vesting of Restricted Performance Units						249,797					2		(1,331		)																					(1,329		)
Restricted Performance Units Amortization													1,926																							1,926
Exercise of Share Options						165,159					2		746																							748
Share Option Amortization													1,121																							1,121
Share Issuance from/to Deferred Compensation Plan						(5,564	)		(10,937	)								(279		)	279															—
Trustee Fees Paid in Shares						1,336					—		15																							15
Adjustment to Non-controlling Interest													358																				(347		)	11
Preferred Share distributions																														(7,832		)				(7,832		)
Preferred Share redemption charges																														(2,090		)				(2,090		)
Distributions declared ($0.45 per share)																														(64,804		)	(1,233		)	(66,037		)
BALANCE, September 30, 2012	6,300,000		$	63		143,438,501		—	290,745		$	1,432	$	2,828,722		$	—	$	5,352		$	(5,352	)	$	510,093		$	(20,456	)	$	(1,467,058	)	$	31,413		$	1,884,209

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September 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																								(259		)							146			(113		)
Comprehensive loss																											(479		)				(8		)	(487		)
Issuance of Common Shares of Beneficial Interest				679,285						7		8,265																								8,272
Equity Issuance Costs												(308		)																			(30		)	(338		)
Conversion of LP Units to Common Shares				92,992						1		1,098																					(1,099		)	—
Bonus Share Issuance						(463	)	463							12			6			(6		)	(6		)										6
Vesting of Restricted Shares				85,248		(116,216	)	9,043		1		(1,818		)	3,062									(1,597		)										(352		)
Restricted Share Amortization												2,228																								2,228
Restricted Performance Units Amortization												1,229																								1,229
Exercise of Share Options				120,179						1		658																								659
Share Option Amortization												1,105																								1,105
Outperformance Plan Amortization												128																								128
Share Issuance from/to Deferred Compensation Plan				(845	)			(8,141	)			(16		)				(149		)	149															(16		)
Share Choice Plan Issuance				(1,684	)							(55		)																						(55		)
Trustees Fees Paid in Shares				2,672								32																								32
Adjustment to Non-controlling Interest												3,037																					(3,037		)	—
Preferred Share distributions																														(5,994		)				(5,994		)
Distributions declared ($0.45 per share)																														(61,294		)	(1,890		)	(63,184		)
BALANCE, September 30, 2011	4,300,000	$	43	135,579,643		—		292,646		$	1,353	$	2,686,800		$	—		$	5,631		$	(5,631	)	$	481,577		$	(2,424	)	$	(1,368,809	)	$	122,354		$	1,920,894

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

11

BRANDYWINE REALTY TRUST

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands)

	Nine-month periods ended
	September 30,
	2012			2011
Cash flows from operating activities:
Net income (loss)	$	33,227		$	(113	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	150,362			164,014
Amortization of deferred financing costs	3,790			3,844
Amortization of debt discount/(premium), net	1,095			1,028
Amortization of stock compensation costs	3,740			4,201
Shares used for employee taxes upon vesting of share awards	(2,232		)	(1,012		)
Straight-line rent income	(17,792		)	(14,925		)
Amortization of acquired above (below) market leases to rental revenue, net	(4,468		)	(4,011		)
Straight-line ground rent expense	1,423			1,450
Provision for doubtful accounts	1,363			1,190
Real estate venture income in excess of distributions	(1,024		)	(1,020		)
Net gain on sale of interests in real estate	(34,773		)	(6,627		)
Loss on real estate formation	950			—
Loss on early extinguishment of debt	1,549			580
Historic tax credit transaction income	(11,840		)	(12,026		)
Changes in assets and liabilities:
Accounts receivable	1,580			2,130
Other assets	(7,200		)	(5,000		)
Accounts payable and accrued expenses	9,565			21,382
Deferred income, gains and rent	(4,681		)	(4,376		)
Deferred financing obligation	(1,314		)	—
Other liabilities	(1,175		)	5,284
Net cash from operating activities	122,145			155,993
Cash flows from investing activities:
Acquisition of properties	(9,226		)	(40,674		)
Investments in available-for-sale securities	(98,250		)	—
Proceeds from the sale of available-for-sale securities	98,250			—
Sales of properties, net	170,918			5,639
Proceeds from repayment of mortgage notes receivable	23,930			—
Capital expenditures	(73,649		)	(97,557		)
Advances for purchase of tenant assets, net of repayments	(13		)	(1,552		)
Loan provided to an unconsolidated Real Estate Venture partner	—			(1,045		)
Investment in unconsolidated Real Estate Ventures	(49,763		)	(2,259		)
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	2,779			3,432
Leasing costs	(22,111		)	(28,460		)
Net cash from (used in) investing activities	42,865			(162,476		)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000			—
Proceeds from Credit Facility	21,500			407,502
Repayments of Credit Facility borrowings	(297,000		)	(424,502		)
Repayments of mortgage notes payable	(9,209		)	(218,959		)
Proceeds from unsecured notes	—			321,498
Deferred financing obligation non-cash interest expense	701			—
Net proceeds from issuance of common shares	—			7,966
Net proceeds from issuance of preferred shares	96,240			—
Redemption of preferred shares	(50,188		)	—
Repayments of unsecured notes	(167,841		)	(25,366		)
Repayments of unsecured term loan	(37,500		)	—
Net settlement of hedge transactions	(74		)	(613		)
Debt financing costs	(8,462		)	(4,199		)
Exercise of stock options	748			659
Distributions paid to shareholders	(71,523		)	(67,119		)
Distributions to noncontrolling interest	(1,196		)	(1,243		)
Net cash from (used in) financing activities	76,196			(4,376		)
Increase (decrease) in cash and cash equivalents	241,206			(10,859		)
Cash and cash equivalents at beginning of period	410			16,565
Cash and cash equivalents at end of period	$	241,616		$	5,706
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2012 and 2011 of $1,978 and $1,450, respectively	$	83,618		$	78,091
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,270		)	(2,114		)
Change in capital expenditures financed through retention payable at period end	284			(5,863		)
Change in unfunded tenant allowance	(1,411		)	(442		)
Distributions payable	24,820			23,505

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

12

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED BALANCE SHEETS

(in thousands, except unit and per unit information)

	September 30, 2012			December 31, 2011
	(unaudited)
ASSETS
Real estate investments:
Operating properties	$	4,660,289		$	4,793,080
Accumulated depreciation	(925,342		)	(865,710		)
Operating real estate investments, net	3,734,947			3,927,370
Construction-in-progress	43,449			25,083
Land inventory	95,500			109,008
Total real estate investments, net	3,873,896			4,061,461
Cash and cash equivalents	241,616			410
Accounts receivable, net	13,394			14,718
Accrued rent receivable, net	117,306			108,101
Investment in real estate ventures, at equity	179,037			115,807
Deferred costs, net	119,182			115,362
Intangible assets, net	52,575			70,515
Notes receivable	7,226			18,186
Other assets	62,494			53,158
Total assets	$	4,666,726		$	4,557,718
LIABILITIES AND EQUITY
Mortgage notes payable	$	502,123		$	511,061
Unsecured credit facility	—			275,500
Unsecured term loans	600,000			37,500
Unsecured senior notes, net of discounts	1,404,466			1,569,934
Accounts payable and accrued expenses	80,554			69,929
Distributions payable	24,820			23,895
Deferred income, gains and rent	80,748			99,569
Acquired lease intangibles, net	29,824			35,106
Other liabilities	59,982			45,528
Total liabilities	2,782,517			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	40,509			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, 143,438,501 and 142,690,755 units issued and outstanding in 2012 and 2011, respectively	1,711,926			1,754,302
Accumulated other comprehensive loss	(20,614		)	(6,426		)
Total Brandywine Operating Partnership, L.P.’s equity	1,843,700			1,851,326
Total liabilities and partners’ equity	$	4,666,726		$	4,557,718

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

13

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 nine-month periods ended
	September 30,						September 30,
	2012			2011			2012			2011
Revenue:
Rents	$	113,989		$	116,251		$	343,260		$	346,579
Tenant reimbursements	20,695			19,010			58,308			59,187
Termination fees	931			157			2,522			2,673
Third party management fees, labor reimbursement and leasing	3,007			3,028			9,021			8,514
Other	1,761			955			4,259			3,314
Total revenue	140,383			139,401			417,370			420,267
Operating Expenses:
Property operating expenses	40,705			40,788			118,068			124,023
Real estate taxes	14,064			13,204			42,292			40,699
Third party management expenses	1,298			1,379			3,812			4,395
Depreciation and amortization	48,738			51,943			147,618			157,157
General & administrative expenses	6,080			6,177			18,209			18,311
Total operating expenses	110,885			113,491			329,999			344,585
Operating income	29,498			25,910			87,371			75,682
Other Income (Expense):
Interest income	311			523			2,635			1,385
Historic tax credit transaction income	11,840			12,026			11,840			12,026
Interest expense	(32,620		)	(32,346		)	(99,745		)	(99,477		)
Interest expense — amortization of deferred financing costs	(1,218		)	(1,846		)	(3,790		)	(3,844		)
Interest expense — financing obligation	(230		)	—			(608		)	—
Equity in income of real estate ventures	500			418			1,382			2,739
Net gain on sale of interests in real estate	—			—			—			2,791
Loss on real estate venture formation	(950		)	—			(950		)	—
Gain (loss) on early extinguishment of debt	(51		)	176			(1,549		)	(580		)
Income (loss) from continuing operations	7,080			4,861			(3,414		)	(9,278		)
Discontinued operations:
Income from discontinued operations	69			1,750			1,867			5,329
Net gain on disposition of discontinued operations	9,940			—			34,774			3,836
Total discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	17,089			6,611			33,227			(113		)
Distribution to Preferred Units	(2,785		)	(1,998		)	(7,832		)	(5,994		)
Preferred unit redemption charge	—			—			(2,090		)	—
Amount allocated to unvested restricted unitholders	(95		)	(121		)	(286		)	(384		)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$	14,209		$	4,492		$	23,019		$	(6,491	)
Basic income (loss) per Common Partnership Unit:
Continuing operations	$	0.03		$	0.02		$	(0.09	)	$	(0.11	)
Discontinued operations	0.07			0.01			0.25			0.06
	$	0.10		$	0.03		$	0.16		$	(0.05	)
Diluted income (loss) per Common Partnership Unit:
Continuing operations	$	0.03		$	0.02		$	(0.09	)	$	(0.11	)
Discontinued operations	0.07			0.01			0.25			0.06
	$	0.10		$	0.03		$	0.16		$	(0.05	)
Basic weighted average common partnership units outstanding	146,082,206			145,372,247			145,842,872			145,027,663
Diluted weighted average common partnership units outstanding	146,785,731			146,651,211			145,842,872			145,027,663
Net income (loss) attributable to Brandywine Operating Partnership, L.P.
Income (loss) from continuing operations	$	7,080		$	4,861		$	(3,414	)	$	(9,278	)
Income from discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	$	17,089		$	6,611		$	33,227		$	(113	)

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

14

BRANDYWINE OPERATING PARTNERSHIP, L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited, in thousands)

	For the three-month periods ended					For the nine-month periods ended
	September 30,					September 30,
	2012			2011		2012			2011
Net income (loss)	$	17,089		$	6,611	$	33,227		$	(113	)
Comprehensive income (loss):
Unrealized loss on derivative financial instruments	(4,222		)	—		(14,780		)	(613		)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76			53		200			126
Unrealized gain on available-for-sale securities	65			—		—			—
Total comprehensive income (loss)	(4,081		)	53		(14,580		)	(487		)
Comprehensive income (loss) attributable to Brandywine Operating Partnership, L.P.	$	13,008		$	6,664	$	18,647		$	(600	)

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

15

BRANDYWINE OPERATING PARTNERSHIP L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands)

	Nine-month periods ended
	September 30,
	2012			2011
Cash flows from operating activities:
Net income (loss)	$	33,227		$	(113	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	150,362			164,014
Amortization of deferred financing costs	3,790			3,844
Amortization of debt discount/(premium), net	1,095			1,028
Amortization of stock compensation costs	3,740			4,201
Shares used for employee taxes upon vesting of share awards	(2,232		)	(1,012		)
Straight-line rent income	(17,792		)	(14,925		)
Amortization of acquired above (below) market leases, net	(4,468		)	(4,011		)
Straight-line ground rent expense	1,423			1,450
Provision for doubtful accounts	1,363			1,190
Real estate venture income in excess of distributions	(1,024		)	(1,020		)
Net gain on sale of interests in real estate	(34,773		)	(6,627		)
Loss on real estate venture formation	950			—
Loss on early extinguishment of debt	1,549			580
Historic tax credit transaction income	(11,840		)	(12,026		)
Changes in assets and liabilities:
Accounts receivable	1,580			2,130
Other assets	(7,200		)	(5,000		)
Accounts payable and accrued expenses	9,565			21,382
Deferred income, gains and rent	(4,681		)	(4,376		)
Deferred financing obligation	(1,314		)	—
Other liabilities	(1,175		)	5,284
Net cash from operating activities	122,145			155,993
Cash flows from investing activities:
Acquisition of properties	(9,226		)	(40,674		)
Investments in available-for-sale securities	(98,250		)	—
Proceeds from sale of available-for-sale securities	98,250			—
Sales of properties, net	170,918			5,639
Proceeds from repayment of mortgage notes receivable	23,930			—
Capital expenditures	(73,649		)	(97,557		)
Advances for purchase of tenant assets, net of repayments	(13		)	(1,552		)
Loan provided to unconsolidated real estate venture partner	—			(1,045		)
Investment in unconsolidated Real Estate Ventures	(49,763		)	(2,259		)
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	2,779			3,432
Leasing costs	(22,111		)	(28,460		)
Net cash from (used in) investing activities	42,865			(162,476		)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000			—
Proceeds from Credit Facility borrowings	21,500			407,502
Repayments of Credit Facility borrowings	(297,000		)	(424,502		)
Repayments of mortgage notes payable	(9,209		)	(218,959		)
Proceeds from unsecured notes	—			321,498
Deferred financing obligation non-cash interest expense	701			—
Net proceeds from issuance of common units	—			7,966
Net proceeds from issuance of preferred units	96,240			—
Redemption of preferred units	(50,188		)	—
Repayments of unsecured notes	(167,841		)	(25,366		)
Repayments of unsecured term loan	(37,500		)	—
Net settlement of hedge transactions	(74		)	(613		)
Debt financing costs	(8,462		)	(4,199		)
Exercise of stock options	748			659
Distributions paid to preferred and common partnership unitholders	(72,719		)	(68,362		)
Net cash from (used in) financing activities	76,196			(4,376		)
Increase (decrease) in cash and cash equivalents	241,206			(10,859		)
Cash and cash equivalents at beginning of period	410			16,565
Cash and cash equivalents at end of period	$	241,616		$	5,706
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2012 and 2011 of $1,978 and $1,450, respectively	$	83,618		$	78,091
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,270		)	(2,114		)
Change in capital expenditures financed through retention payable at period end	284			(5,863		)
Change in unfunded tenant allowance	(1,411		)	(442		)
Distributions payable	24,820			23,505

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

16

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

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

September 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 September 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 September 30, 2012, the Company owned 219 properties, consisting of 194 office properties, 19 industrial facilities, five mixed-use properties and one development property (collectively, the “Properties”) containing an aggregate of approximately 24.5 million net rentable square feet. In addition, as of September 30, 2012, the Company owned economic interests in 19 unconsolidated real estate ventures that contain approximately 7.0 million net rentable square feet (collectively, the “Real Estate Ventures”). As of September 30, 2012, the Company also owned 424 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 September 30, 2012, the management company subsidiaries were managing properties containing an aggregate of approximately 31.9 million net rentable square feet, of which approximately 24.5 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 September 30, 2012, the results of its operations for the three and nine-month periods ended September 30, 2012 and 2011 and its cash flows for the nine-month periods ended September 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

17

approximately $0.6 million at September 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

18

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 nine-month periods ended September 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 $9.0 million as of September 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 Company is currently in negotiations to extend the development agreements related to these land parcels to December 31, 2015, and believes that an extension of these agreements is probable.

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 fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

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 $4.3 million and $16.0 million for the three and nine-month periods ended September 30, 2012, and approximately $4.9 million and $13.2 million for the three and nine-month periods ended September 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 $1.8 million for the three and nine-month periods ended September 30, 2012, and by $0.6 million and $1.7 million for the three and nine-month periods ended September 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 $0.6 million for the three and nine-month periods ended September 30, 2012, and by $0.4 million and $1.0 million for the three and nine-month periods ended September 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 September 30, 2012, 5,290,717 common shares remained available for future awards under the 1997 Plan (including 4,030,218 shares available solely for options and share appreciation rights). Through September 30, 2012, all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $1.8 million and $5.5 million during the three and nine-month periods ended September 30, 2012, of which $0.5 million and $1.4 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 $4.8 million during the three and nine-month periods ended September 30, 2011, of which $0.4 million and $1.1 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 derivatives and available-for-sale securities 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 September 30, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	September 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	18,741	$	—	$	18,741	$	—

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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 nine months ended September 30, 2012.

Available-for-sale securities

During the third quarter of 2012, the Company sold its entire remaining portfolio of available-for-sale securities, totaling $42.1 million, recognizing a $0.1 million loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Company's best interest.

The following table sets forth the details of the remaining available-for-sale securities sold during the third quarter of 2012 (in thousands):

	Available-for-sale Securities Sold
	Cash Received		Principal Amount		Gain (loss)
Available-for-sale securities	$	42,030	$	42,105	$	(75	)

The Company did not hold any available-for-sale securities as of September 30, 2012 or December 31, 2011.

Notes Receivable

As of September 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.

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

During the second quarter of 2012, 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 2014. In December of 2011, 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 have 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 September 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 September 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

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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.

3. REAL ESTATE INVESTMENTS

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

	September 30, 2012		December 31, 2011
Land	$	649,689	$	677,891
Building and improvements	3,530,214		3,631,388
Tenant improvements	480,386		483,801
	$	4,660,289	$	4,793,080

Brandywine/Toll Brothers Venture

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

Based on the facts and circumstances at Venture formation, the Company has determined that the Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the voting interest model under the accounting standard for consolidation to determine if it will consolidate the Venture. Based on the provisions within the joint venture agreement, the Company and Toll Brothers have significant participating rights and the Company does not have exclusive

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control over the development or construction phases of the project. Since each partner has significant participating rights, the land parcel contributed to the Venture was deconsolidated by the Company and is accounted for under the equity method of accounting. As of September 30, 2012, the carrying amount of the Company's equity investment in this Venture amounted to $15.2 million, with an associated $0.3 million permanent basis adjustment accounting for the difference between the fair value and carrying amount of the said land parcel. This basis adjustment will remain unamortized until the property is sold to a third party or the Venture is dissolved, in accordance with the accounting standard for equity method investments.

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 recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet, in accordance with guidance on asset acquisitions.

Dispositions

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, were 81.6% occupied as of the date of sale.

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

4. INVESTMENT IN UNCONSOLIDATED VENTURES

As of September 30, 2012, the Company had an aggregate investment of approximately $179.0 million in 19 unconsolidated Real Estate Ventures. The Company formed or acquired interests in these ventures with unaffiliated third parties to develop or manage office properties or to acquire land in anticipation of possible development of office or residential properties. As of September 30, 2012, 15 of the Real Estate Ventures owned 54 office buildings that contain an aggregate of approximately 7.0 million net rentable square feet; three Real Estate Ventures owned 24 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.

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The following is a summary of the financial position of the Real Estate Ventures as of September 30, 2012 and December 31, 2011 (in thousands):

	September 30, 2012		December 31, 2011
Net property	$	925,227	$	846,643
Other assets	180,957		110,520
Other liabilities	55,592		48,798
Debt	740,885		745,830
Equity	309,707		162,535
Company’s share of equity (Company’s basis)	179,037		115,807

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

	Three-month periods ended September 30,				Nine-month periods ended September 30,
	2012		2011		2012		2011
Revenue	$	42,772	$	36,345	$	120,644	$	108,743
Operating expenses	18,753		15,863		51,819		46,407
Interest expense, net	10,233		10,326		31,100		31,999
Depreciation and amortization	12,947		9,869		36,067		28,836
Net income (loss)	839		287		1,658		1,501
Company’s share of income (Company’s basis)	500		418		1,382		2,739

As of September 30, 2012, the Company had guaranteed repayment of approximately $0.6 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.

On September 19, 2012, the Company settled and was released from a previous agreement with a third party service provider ("the provider") who provided services related to Brandywine AI Ventures ("the venture"). The agreement between the two parties required that the Company pay the provider certain commissions and fees related to real estate acquisitions to be executed by the venture in the future. The Company paid a one-time termination fee of approximately $1.0 million to the provider in order to terminate and discharge any future obligations of commissions and fees associated with acquisitions by the venture. This fee is shown within the Company's consolidated statements of operations as "Loss on real estate venture formation" as the fee is associated with a contract entered into at the time of the formation of the venture. There were no comparable charges for the prior period.

5. DEFERRED COSTS

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

	September 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	145,212	$	(56,536	)	$	88,676
Financing Costs	40,828		(10,322		)	30,506
Total	$	186,040	$	(66,858	)	$	119,182

	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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During the three and nine-month periods ended September 30, 2012, the Company capitalized internal direct leasing costs of $1.3 million and $4.0 million, respectively, and $1.4 million and $4.7 million during the three and nine-month periods ended September 30, 2011, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

6. INTANGIBLE ASSETS

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

	September 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	72,099	$	(45,704	)	$	26,395
Tenant relationship value	58,811		(38,716		)	20,095
Above market leases acquired	7,840		(1,755		)	6,085
Total	$	138,750	$	(86,175	)	$	52,575
Below market leases acquired	$	73,342	$	(43,518	)	$	29,824

	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 September 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 (three months remaining)	$	3,603	$	1,642
2013	12,076		6,284
2014	9,299		4,741
2015	6,909		2,597
2016	4,436		1,704
Thereafter	16,252		12,856
Total	$	52,575	$	29,824

7. DEBT OBLIGATIONS

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

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MORTGAGE DEBT:

Property / Location	September 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,289		$	56,538		7.25	%		May-13
Southpoint III	1,317			1,887			7.75	%		Apr-14
Tysons Corner	93,625			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,524			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	198,592			202,905			7.00	%		Sep-30
Cira South Garage	42,834			44,379			7.12	%		Sep-30
Principal balance outstanding	503,181			512,391
Plus: fair market value premiums (discounts), net	(1,058		)	(1,330		)
Total mortgage indebtedness	$	502,123		$	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 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	216,819			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	2,008,808			1,888,111
plus: original issue premium (discount), net	(4,342		)	(5,177		)
Total unsecured indebtedness	$	2,004,466		$	1,882,934
Total Debt Obligations	$	2,506,589		$	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 (the "New 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, and were repaid using a portion of the proceeds from the term loans.

During the nine-month periods ended September 30, 2012 and September 30, 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 6.72% and 6.83%, respectively.

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During the nine-months ended September 30, 2012, the Company repurchased $15.1 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		(263		)	8
2015 7.500% Notes	12,011		10,510		(1,284		)	10
	$	16,950	$	15,113	$	(1,549	)	$	18

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 September 30, 2012 is February 1, 2016. The per annum variable interest rate on any related outstanding balances, for which there were none at September 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 September 30, 2012, the Company had no related borrowings, with $2.8 million in letters of credit outstanding, leaving $597.2 million of unused availability under the New Credit Facility. During the nine-months ended September 30, 2011, the weighted-average interest rate on the Former Credit Facility borrowings was 0.98%. As of September 30, 2011, the weighted average interest rate on the Former Credit Facility was 0.95%. There were no comparable rates as of September 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, and 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 September 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 September 30, 2012.

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

2012	$	3,262
2013	66,924
2014	250,612
2015	466,853
2016	596,608
Thereafter	1,127,730
Total principal payments	2,511,989
Net unamortized premiums/(discounts)	(5,400		)
Outstanding indebtedness	$	2,506,589

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 September 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 September 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):

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable	$	503,181	$	548,413	$	512,391		$	545,784
Unsecured notes payable	$	1,330,198	$	1,458,187	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	9,790	$	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 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 September 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 September 30, 2012 was 3.222%. An increase in the discount rate used in the discounted cash flow model would result in a decrease to the fair value of the Company's long-term debt. Conversely, a decrease in the discount rate used in the discounted cash flow model would result in an increase to the fair value of the Company's long-term debt.

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Disclosure about the fair value of financial instruments is based upon pertinent information available to management as of September 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 September 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 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 its unsecured public debt securities (Note 7) contain restrictions, requirements and other limitations on the ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt which it must maintain. The ability to borrow under the 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 any borrowings under the New Credit Facility would become unavailable. If the Company is unable to obtain a waiver, this would have a material adverse effect on the Company’s financial position and results of operations.

The Company was in compliance with all financial covenants as of September 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

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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 September 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
				9/30/2012		12/31/2011						9/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	9,523	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	2,385		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	509		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	271		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	993		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,408		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	1,095		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	1,327		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	1,230		—
				$	578,610	$	452,836					$	18,741	$	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 nine-month periods ended September 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

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the Company could be adversely affected if such tenants go into default under their leases.

10. DISCONTINUED OPERATIONS

For the three and nine-month periods ended September 30, 2012, income from discontinued operations relates to the 14 properties that the Company sold during 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and nine-month periods ended September 30, 2012 (in thousands):

	Three-month period ended September 30, 2012			Nine-month period ended September 30, 2012
Revenue:
Rents	$	271		$	6,384
Tenant reimbursements	(16		)	742
Termination fees	4			11
Other	(1		)	88
Total revenue	258			7,225
Expenses:
Property operating expenses	154			1,855
Real estate taxes	29			755
Depreciation and amortization	6			2,750
Total operating expenses	189			5,360
Other income (expense):
Interest income	—			2
Income from discontinued operations before gain on sale of interests in real estate	69			1,867
Net gain on disposition of discontinued operations	9,940			34,774
Income from discontinued operations	$	10,009		$	36,641

For the three and nine-month periods ended September 30, 2011, income from discontinued operations relates to the 18 properties that the Company sold from January 1, 2011 through September 30, 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and nine-month periods ended September 30, 2011 (in thousands):

	Three-month period ended September 30, 2011			Nine-month period ended September 30, 2011
Revenue:
Rents	$	5,450		$	16,742
Tenant reimbursements	797			2,728
Termination fees	33			33
Other	(2		)	—
Total revenue	6,278			19,503
Expenses:
Property operating expenses	1,573			5,212
Real estate taxes	659			2,105
Depreciation and amortization	2,296			6,857
Total operating expenses	4,528			14,174
Income from discontinued operations before gain on sale of interests in real estate	1,750			5,329
Net gain on disposition of discontinued operations	—			3,836
Income from discontinued operations	$	1,750		$	9,165

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.

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As of September 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 $31.4 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 $32.4 million and $25.6 million, respectively.

12. BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Net income from continuing operations attributable to non-controlling interests	(78		)	(78		)	(276		)	(276		)
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common shareholders	4,122			4,122			2,466			2,466
Income from discontinued operations	10,009			10,009			1,750			1,750
Discontinued operations attributable to non-controlling interests	(182		)	(182		)	(86		)	(86		)
Discontinued operations attributable to common shareholders	9,827			9,827			1,664			1,664
Net income attributable to common shareholders	$	13,949		$	13,949		$	4,130		$	4,130
Denominator
Weighted-average shares outstanding	143,424,485			143,424,485			135,562,487			135,562,487
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average shares outstanding	143,424,485			144,128,010			135,562,487			136,841,451
Earnings per Common Share:
Income from continuing operations attributable to common shareholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common shareholders	0.07			0.07			0.01			0.01
Net income attributable to common shareholders	$	0.10		$	0.10		$	0.03		$	0.03

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	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Net loss from continuing operations attributable to non-controlling interests	244			244			88			88
Amount allocable to unvested restricted shareholders	(286		)	(286		)	(384		)	(384		)
Preferred share dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(13,378		)	(13,378		)	(15,568		)	(15,568		)
Income from discontinued operations	36,641			36,641			9,165			9,165
Discontinued operations attributable to non-controlling interests	(669		)	(669		)	(234		)	(234		)
Discontinued operations attributable to common shareholders	35,972			35,972			8,931			8,931
Net income (loss) attributable to common shareholders	$	22,594		$	22,594		$	(6,637	)	$	(6,637	)
Denominator
Weighted-average shares outstanding	143,182,911			143,182,911			135,164,424			135,164,424
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.09	)	$	(0.09	)	$	(0.12	)	$	(0.12	)
Discontinued operations attributable to common shareholders	0.25			0.25			0.07			0.07
Net income (loss) attributable to common shareholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

Redeemable common limited partnership units totaling 2,657,721 and 9,809,759 as of September 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 nine months ended September 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 on 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 related 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

35

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. 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 prior year.

On September 11, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which was paid on October 19, 2012 to shareholders of record as of October 5, 2012. On September 11, 2012, the Parent Company declared distributions on its Series D Preferred Shares and Series E Preferred Shares to holders of record as of September 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares under the Offering Program. During the nine-month period ended September 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 September 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 nine-month period ended September 30, 2012. As of September 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 tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

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	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common unitholders	4,200			4,200			2,742			2,742
Discontinued operations attributable to common unitholders	10,009			10,009			1,750			1,750
Net income attributable to common unitholders	$	14,209		$	14,209		$	4,492		$	4,492
Denominator
Weighted-average units outstanding	146,082,206			146,082,206			145,372,247			145,372,247
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average units outstanding	146,082,206			146,785,731			145,372,247			146,651,211
Earnings per Common Partnership Unit:
Income from continuing operations attributable to common unitholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common unitholders	0.07			0.07			0.01			0.01
Net income attributable to common unitholders	$	0.10		$	0.10		$	0.03		$	0.03

	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Amount allocable to unvested restricted unitholders	(286		)	(286		)	(384		)	(384		)
Preferred unit dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(13,622		)	(13,622		)	(15,656		)	(15,656		)
Discontinued operations attributable to common unitholders	36,641			36,641			9,165			9,165
Net income (loss) attributable to common unitholders	$	23,019		$	23,019		$	(6,491	)	$	(6,491	)
Denominator
Weighted-average units outstanding	145,842,872			145,842,872			145,027,663			145,027,663
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.09	)	$	(0.09	)	$	(0.11	)	$	(0.11	)
Discontinued operations attributable to common unitholders	0.25			0.25			0.06			0.06
Net income (loss) attributable to common unitholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

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

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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. 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 prior year.

On September 11, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on October 19, 2012 to unitholders of record as of October 5, 2012.

On September 11, 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 September 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares related to the Offering Program, and accordingly, during the nine-month period ended September 30, 2012, the Operating Partnership did not issue any common partnership units in connection with the Parent Company's 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 nine-month period ended September 30, 2012 and accordingly, during the nine-month period ended September 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 September 30, 2012, the Parent Company had 3,402,684 options outstanding under its shareholder approved equity incentive plan. There were 666,918 options unvested as of September 30, 2012 and $1.3 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 1.1 years. During the three and nine-month periods ended September 30, 2012 the Company recognized compensation expense related to unvested options of $0.4 million and $1.1 million, of which $0.1 million and a $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. During the three and nine-month periods ended September 30, 2011, the Company recognized compensation expense related to unvested options of $0.4 million and $1.1 million, of which $0.1 million and $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization.

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Option activity as of September 30, 2012 and changes during the nine-months ended September 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	(165,159	)	$	4.53	—	—
Canceled	(31,829	)	$	14.33
Outstanding at September 30, 2012	3,402,684		$	14.64	6.20	$	(9,559,637	)
Vested/Exercisable at September 30, 2012	2,735,766		$	15.80	6.09	$	(9,857,702	)

Restricted Share Awards

As of September 30, 2012, 631,854 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 September 30, 2012 was approximately $4.0 million. That expense is expected to be recognized over a weighted average remaining vesting period of 2.2 years. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $2.3 million during the three and nine-month periods ended September 30, 2012, of which $0.2 million and $0.5 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 $2.4 million during the three and nine-month periods ended September 30, 2011, of which $0.2 million and $0.5 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 nine-months ended September 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	(10,238	)	11.49
Non-vested at September 30, 2012	631,854		$	12.61

On March 1, 2012, the Compensation Committee of the Company’s Board of Trustees awarded 193,270 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 September 30, 2012, one 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 260,571, 122,119, and 118,751 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

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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 September 30, 2012, one of the Company’s executives has met conditions to elect a qualifying retirement.

For the three and nine-month periods ended September 30, 2012, the Company recognized total compensation expense for the 2012, 2011, and 2010 awards of $0.7 million and $2.1 million, of which $0.2 million and $0.6 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the three and nine-month periods ended September 30, 2011, the Company recognized total compensation expense for the 2011 and 2010 awards of $0.5 million and $1.2 million, of which $0.1 million and $0.3 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 nine-month periods ended September 30, 2012, employees made purchases under the ESPP of $0.1 million and $0.3 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and nine-month periods ended September 30, 2012. During the three and nine-month periods ended September 30, 2011, employees made purchases under the ESPP of $0.1 million and $0.3 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and nine-month periods ended September 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 nine-month periods ended September 30, 2012 and September 30, 2011, the Company recorded a net increase in compensation costs of $0.5 million and a net decrease in compensation costs of $0.8 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

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have no interest in any assets set aside by the Company to meet its obligations under the Plan. For the nine-month periods ended September 30, 2012 and September 30, 2011, the Company recorded a net decrease in compensation costs of $0.5 million and a net increase in compensation costs of $0.8 million, respectively, 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 September 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.

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 $39.1 million and $51.6 million as of September 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 September 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. For the nine months ended September 30, 2012, the Company recognized $11.8 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. 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 September 30, 2012 and December 31, 2011 is $1.6 million and $2.1 million, respectively 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 $1.0 million for the three and nine-month periods ended September 30, 2012, respectively, and $0.3 million and $1.0 million for the three and nine-month periods ended September 30, 2011, respectively.

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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 September 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 September 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 September 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.

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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 September 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,174,597	$	962,235	$	1,189,014	$	545,104	$	308,371	$	259,304	$	221,664	$	—		$	4,660,289
Construction-in-progress															43,449			43,449
Land inventory															95,500			95,500
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 September 30, 2012:
Total revenue	$	38,526	$	33,025	$	26,516	$	20,553	$	8,826	$	8,275	$	5,141	$	(479	)	$	140,383
Property operating expenses, real estate taxes and third party management expenses	13,588		12,431		10,637		10,030		3,762		3,484		2,639		(504		)	56,067
Net operating income	$	24,938	$	20,594	$	15,879	$	10,523	$	5,064	$	4,791	$	2,502	$	25		$	84,316
For the three-months ended September 30, 2011:
Total revenue	$	36,812	$	31,097	$	29,296	$	20,743	$	9,334	$	7,453	$	4,968	$	(302	)	$	139,401
Property operating expenses, real estate taxes and third party management expenses	13,493		11,539		10,868		10,008		3,664		3,233		3,009		(443		)	55,371
Net operating income	$	23,319	$	19,558	$	18,428	$	10,735	$	5,670	$	4,220	$	1,959	$	141		$	84,030
For the nine-months ended September 30, 2012:
Total revenue	$	113,565	$	98,086	$	79,919	$	61,442	$	26,762	$	23,959	$	14,942	$	(1,305	)	$	417,370
Property operating expenses, real estate taxes and third party management expenses	39,643		37,082		31,158		28,697		10,875		10,497		7,498		(1,278		)	164,172
Net operating income	$	73,922	$	61,004	$	48,761	$	32,745	$	15,887	$	13,462	$	7,444	$	(27	)	$	253,198
For the nine-months ended September 30, 2011:
Total revenue	$	111,949	$	93,520	$	89,936	$	60,554	$	27,409	$	23,203	$	14,551	$	(855	)	$	420,267
Property operating expenses, real estate taxes and third party management expenses	42,112		34,962		34,002		30,611		10,666		9,740		8,015		(991		)	169,117
Net operating income	$	69,837	$	58,558	$	55,934	$	29,943	$	16,743	$	13,463	$	6,536	$	136		$	251,150

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

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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 September 30,						Nine-month periods ended September 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,316		$	84,030		$	253,198		$	251,150
Less:
Interest expense	(32,620		)	(32,346		)	(99,745		)	(99,477		)
Deferred financing costs	(1,218		)	(1,846		)	(3,790		)	(3,844		)
Depreciation and amortization	(48,738		)	(51,943		)	(147,618		)	(157,157		)
Administrative expenses	(6,080		)	(6,177		)	(18,209		)	(18,311		)
Plus:
Interest income	311			523			2,635			1,385
Historic tax credit transaction income	11,840			12,026			11,840			12,026
Interest expense - financing obligation	(230		)	—			(608		)	—
Equity in income of real estate ventures	500			418			1,382			2,739
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on real estate venture formation	(950		)	—			(950		)	—
Gain (loss) on early extinguishment of debt	(51		)	176			(1,549		)	(580		)
Income (loss) from continuing operations	7,080			4,861			(3,414		)	(9,278		)
Income from discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	$	17,089		$	6,611		$	33,227		$	(113	)

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 September 30, 2012 are as follows (in thousands):

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2012 (three months remaining)	$	455
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,754

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 September 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 September 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

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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.

18. SUBSEQUENT EVENTS

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 September 30, 2012 and December 31, 2011 and for the three and nine-months ended September 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 September 30, 2012, our 219 property portfolio consisted of 194 office properties, 19 industrial facilities, five mixed-use properties and one development property that contain an aggregate of approximately 24.5 million net rentable square feet. These 219 properties compose our core portfolio. As of September 30, 2012, we also held economic interests in 19 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 7.0 million net rentable square feet.

As of September 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

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increases in past due accounts, tenant defaults, lower occupancy and reduced effective rents. These conditions would negatively affect our future net income and cash flows and could have a material adverse effect on our financial condition. We believe that the quality of our assets and our strong balance sheet will enable us to raise debt capital, if necessary, in various forms and from different sources, including traditional term or secured loans from banks, pension funds and life insurance companies. However, there can be no assurance that we will be able to borrow funds on terms that are economically attractive or at all.

We seek revenue growth throughout our portfolio by increasing occupancy and rental rates. Occupancy at our wholly owned properties at September 30, 2012 was 86.3%.

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

	Three-month period ended			Nine-month period ended
	September 30, 2012			September 30, 2012
Leasing Activity:
Total net rentable square feet owned (1)	24,327,765			24,327,765
Occupancy percentage (end of period)	86.3		%	86.3		%
Average occupancy percentage	86.5		%	86.5		%
New leases and expansions commenced (square feet)	510,718			1,326,839
Leases renewed (square feet)	701,961			1,468,579
Net absorption (square feet) (2)	(129,364		)	(32,860		)
Percentage change in rental rates per square feet (3):
New and expansion rental rates	8.0		%	2.9		%
Renewal rental rates	3.6		%	1.5		%
Combined rental rates	4.3		%	1.8		%
Capital Costs Committed (4):
Leasing commissions (per square feet)	$	4.20		$	4.96
Tenant Improvements (per square feet)	$	7.03		$	14.06

(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 0.7% of our aggregate final annualized base rents as of September 30, 2012 (representing approximately 0.8% 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 nine months ended September 30, 2012, we achieved a 65.0% 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 $16.0 million or 10.9% of total receivables (including accrued rent receivables) as of September 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 September 30, 2012, we owned approximately 424 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 $9.0 million as of September 30, 2012, would have to be written-off in the period that it is determined that the development would not be commenced. We are currently in negotiations to extend the development agreements related to these land parcels to December 31, 2015, and believe that an extension of these agreements is probable.

RECENT PROPERTY TRANSACTIONS

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

Based on the facts and circumstances at Venture formation, we have determined that the Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, we used the voting interest model under the accounting standard for consolidation to determine if it will consolidate the Venture. Based on the provisions within the joint venture agreement, we, along with Toll Brothers, have significant participating rights, and we do not have exclusive control over the development or construction phases of the project. Since each partner has significant participating rights, we deconsolidated the land parcel contributed to the Venture, which is accounted for under the equity method of accounting. As of September 30, 2012, the carrying amount of our equity investment in this Venture amounted to $15.2 million, with an associated $0.3 million permanent basis adjustment accounting for the difference between the fair value and carrying amount of the said land parcel. This basis adjustment will remain unamortized until the property is sold to a third party or the Venture is dissolved, in accordance with the accounting standard for equity method investments.

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, were 81.6% occupied as of the date of sale.

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, since repaid with available corporate funds. We also recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet, in accordance with guidance on asset acquisitions.

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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 unaudited consolidated financial statements for the three and nine-month periods ended September 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 nine-month periods ended September 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 property operating expenses, real estate taxes and third party management expenses. Property operating expenses that are included in determining NOI consist of costs that are necessary and allocable to our operating properties such as utilities, property-level salaries, repairs and maintenance, property insurance, management fees and bad debt expense. General and administrative expenses that are not reflected in NOI primarily consist of corporate-level salaries, amortization of share awards and professional fees that are incurred as part of corporate office management. NOI is a non-GAAP financial measure that we use internally to evaluate the operating performance of our real estate assets by segment, as presented in Note 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 September 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 216 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 September 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 September 30, 2012. The Total Portfolio includes the effects of other properties that were either placed into service, acquired or redeveloped after July 1, 2011 or disposed prior to September 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 September 30, 2012 and 2011) by providing information for the properties which were acquired, placed into service, under development or redevelopment

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and administrative/elimination information for the three-month periods ended September 30, 2012 and 2011 (in thousands).

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

Comparison of three-months ended September 30, 2012 to the three-months ended September 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	$	107,667		$	106,953		$	714		$	573		$	332		$	—		$	—	$	(741	)	$	2,295		$	107,499		$	109,580		$	(2,081	)
Straight-line rents	4,420			5,045			(625		)	185			39			303			—		—			201			4,908			5,285			(377		)
Above/below market rent amortization	1,429			1,247			182			153			102			—			—		—			37			1,582			1,386			196
Total rents	113,516			113,245			271			911			473			303			—		(741		)	2,533			113,989			116,251			(2,262		)
Tenant reimbursements	20,345			18,857			1,488			219			6			19			—		112			147			20,695			19,010			1,685
Termination fees	931			157			774			—			—			—			—		—			—			931			157			774
Third party management fees, labor reimbursement and leasing	—			—			—			—			—			—			—		3,007			3,028			3,007			3,028			(21		)
Other	1,773			755			1,018			—			—			—			—		(12		)	200			1,761			955			806
Total revenue	136,565			133,014			3,551			1,130			479			322			—		2,366			5,908			140,383			139,401			982
Property operating expenses	42,705			42,260			445			416			196			95			—		(2,511		)	(1,668		)	40,705			40,788			(83		)
Real estate taxes	13,875			12,751			1,124			18			12			(11		)	—		182			441			14,064			13,204			860
Third party management expenses	—			—			—			—			—			—			—		1,298			1,379			1,298			1,379			(81		)
Net operating income	79,985			78,003			1,982			696			271			238			—		3,397			5,756			84,316			84,030			286
General & administrative expenses	—			—			—			—			390			—			—		6,080			5,787			6,080			6,177			(97		)
Depreciation and amortization	48,091			50,089			(1,998		)	537			305			42			—		68			1,549			48,738			51,943			(3,205		)
Operating income (loss)	$	31,894		$	27,914		$	3,980		$	159		$	(424	)	$	196		$	—	$	(2,751	)	$	(1,580	)	$	29,498		$	25,910		$	3,588
Number of properties	216			216						2						1					—						219
Square feet	24,086			24,086						242						154					—						24,482
Occupancy %	86.5		%	85.5		%				66.0		%				38.2		%									86.0		%
Other Income (Expense):
Interest income																											311			523			(212		)
Historic tax credit interest income																											11,840			12,026			(186		)
Interest expense																											(32,620		)	(32,346		)	(274		)
Deferred financing costs																											(1,218		)	(1,846		)	628
Interest expense — Deferred financing costs																											(230		)	—			(230		)
Equity in income of real estate ventures																											500			418			82
Loss on real estate venture formation																											(950		)	—			(950		)
Gain (loss) on early extinguishment of debt																											(51		)	176			(227		)
Income from continuing operations																											7,080			4,861			2,219
Income from discontinued operations																											10,009			1,750			8,259
Net income																											$	17,089		$	6,611		$	10,478
Income per common share																											$	0.10		$	0.03		$	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.

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Total Revenue

Cash rents from the Total Portfolio decreased by $2.1 million from the third quarter of 2011 to the third quarter of 2012 primarily reflecting a decrease of $3.0 million of rental income as a result of contributing two properties to one of our unconsolidated joint ventures during the fourth quarter of 2011.

This decrease was offset by:

• an increase of $0.7 million due to an increase in same store occupancy of 100 basis points from the third quarter of 2011 to the third quarter of 2012;

• an increase of $0.2 million related to the placement into service of the Juniper Street Garage and 660 Allendale Road during the third quarter of 2011, and the acquisition of 3020 Market Street during the third quarter of 2011, and;

• a 550 basis point increase in renewal cash rental rates from the third quarter of 2011 to the third quarter of 2012.

Straight-line rents decreased by $0.4 million due to leases with free rent periods that commenced subsequent to the third quarter of 2011 at our same store properties. These decreases were offset by a $0.3 million increase related to a tenant taking occupancy of a portion of a redevelopment property, 660 Germantown Pike, during the third quarter of 2012.

Tenant reimbursement revenue increased$1.7 million within our same store portfolio consistent with the increase in operating expense.

Termination fees at our Total Portfolio increased by $0.8 million due to timing and volume of tenant move-outs during the third quarter of 2012 when compared to the third quarter of 2011.

Other income at our Total Portfolio increased by $0.8 million during the third quarter of 2012 compared to the third quarter of 2011 as a result of real estate tax refunds received related to prior years tax assessment appeals.

Real Estate Taxes

Real estate taxes at our same store portfolio increased by $0.9 million as a result of an increase in real estate tax rates across our portfolio during third quarter of 2012 compared to the third quarter of 2011. The increase was offset by a $0.3 million decrease in real estate tax expenses for the two properties contributed to an unconsolidated real estate venture in 2011.

Depreciation and Amortization

Depreciation and amortization expense decreased by $3.2 million mainly due to a decrease in the amount of assets written-off related to early terminations of leases during the third quarter of 2012 as compared to the third quarter of 2011. In addition, during the third quarter of 2012 the depreciation of intangible assets related to the Three Logan Square acquisition were fully amortized because a majority of the tenants had a two year lease term on the acquisition date of the property.

Deferred Financing Costs

Deferred financing costs decreased $0.6 million during the third quarter of 2012 compared to the third quarter of 2011 mainly due to the recognition of $0.8 million of financing costs related to the early extinguishment of the mortgage indebtedness encumbering One Logan Square during the third quarter of 2011.

Loss on Real Estate Venture Formation

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

Discontinued Operations

During the three months ended September 30, 2012, we sold 11 flex/office properties located in Exton, Pennsylvania. Through the date of sale during the third quarter, the properties had total revenues of $0.3 million, property operating expenses of $0.2 million and a nominal amount of depreciation and amortization expense. We recognized a net gain on sale related to this transaction of $9.9 million.

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The September 30, 2011 amounts are reclassified to include the operations of the properties sold through the third 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 third quarter of 2011 includes total revenue of $6.3 million, operating expense of $2.2 million, and depreciation and amortization of $2.3 million.

Net income

Net income increased by $10.5 million during the three months ended September 30, 2012 compared to the three months ended September 30, 2011 as a result of the factors described above. Net income is significantly impacted by depreciation of operating properties and amortization of acquired intangibles. These non-cash charges do not directly affect our ability to pay dividends. Amortization of acquired intangibles will continue over the related lease terms or estimated duration of the tenant relationships.

Income per Common Share

Income per share was $0.10 during the three months ended September 30, 2012 as compared to income per share of $0.03 during the three months ended September 30, 2011 as a result of the factors described above.

Comparison of the Nine-Month Periods Ended September 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 nine-month periods ended September 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 September 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 September 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 nine-month periods ended September 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 nine-month periods ended September 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 nine-months ended September 30, 2012 to the nine-months ended September 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	$	319,624		$	319,760		$	(136	)	$	3,806		$	1,704		$	—		$	—	$	(2,215	)	$	6,829		$	321,215		$	328,293		$	(7,078	)
Straight-line rents	16,432			13,754			2,678			774			105			303			—		—			381			17,509			14,240			3,269
Above/below market rent amortization	4,172			3,904			268			364			36			—			—		—			106			4,536			4,046			490
Total rents	340,228			337,418			2,810			4,944			1,845			303			—		(2,215		)	7,316			343,260			346,579			(3,319		)
Tenant reimbursements	57,463			58,647			(1,184		)	499			63			19			—		327			477			58,308			59,187			(879		)
Termination fees	2,522			2,673			(151		)	—			—			—			—		—			—			2,522			2,673			(151		)
Third party management fees, labor reimbursement and leasing	—			—			—			—			—			—			—		9,021			8,514			9,021			8,514			507
Other	4,092			2,757			1,335			24			—			—			—		143			557			4,259			3,314			945
Total revenue	404,305			401,495			2,810			5,467			1,908			322			—		7,276			16,864			417,370			420,267			(2,897		)
Property operating expenses	123,065			128,842			(5,777		)	2,206			831			58			—		(7,261		)	(5,650		)	118,068			124,023			(5,955		)
Real estate taxes	41,508			39,294			2,214			192			148			26			—		566			1,257			42,292			40,699			1,593
Third party management expenses	—			—			—			—			—			—			—		3,812			4,395			3,812			4,395			(583		)
Net Operating Income	239,732			233,359			6,373			3,069			929			238			—		10,159			16,862			253,198			251,150			2,048
General & administrative expenses	(19		)	4			(23		)	13			425			—			—		18,215			17,882			18,209			18,311			(102		)
Depreciation and amortization	144,441			150,864			(6,423		)	2,817			1,023			43			—		317			5,270			147,618			157,157			(9,539		)
Operating Income (loss)	$	95,310		$	82,491		$	12,819		$	239		$	(519	)	$	195		$	—	$	(8,373	)	$	(6,290	)	$	87,371		$	75,682		$	11,689
Number of properties	213			213						5						1					—						219
Square feet	23,960			23,960						368						154					—						24,482
Occupancy %	86.4		%	85.4		%				77.7		%				38.2		%									86.0		%
Other Income (Expense):
Interest income																											2,635			1,385			1,250
Historic tax credit interest income																											11,840			12,026			(186		)
Interest expense																											(99,745		)	(99,477		)	(268		)
Deferred financing costs																											(3,790		)	(3,844		)	54
Interest expense — Deferred financing costs																											(608		)	—			(608		)
Equity in income of real estate ventures																											1,382			2,739			(1,357		)
Net gain on sale of interests in real estate																											—			2,791			(2,791		)
Loss on real estate venture formation																											(950		)	—			(950		)
Loss on early extinguishment of debt																											(1,549		)	(580		)	(969		)
Loss from continuing operations																											$	(3,414	)	$	(9,278	)	$	5,864
Income from discontinued operations																											36,641			9,165			27,476
Net income (loss)																											$	33,227		$	(113	)	$	33,340
Income (loss) per common share																											$	0.16		$	(0.05	)	$	0.21

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 $7.1 million from the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011 primarily reflecting:

• a decrease of $9.1 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 $0.1 million at our same store portfolio which is consistent with the 20 basis points decrease in cash rent growth during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011.

These decreases were offset by an increase of $2.1 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 $3.3 million during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011 due to leases with free rent periods that commenced subsequent to the third quarter of 2011 at our same store properties. In addition, there was a $0.6 million increase related to the acquisitions mentioned above. There was also a $0.3 million increase related to a tenant taking occupancy of a portion of a redevelopment property, 660 Germantown Pike, during the third quarter of 2012. These increases were offset by a decrease of $0.3 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 $0.9 million during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011 as a direct result of the $4.4 million decrease in operating expenses over the same period. Please see the Property Operating Expenses explanations below and note that certain costs, such as snow removal costs, have a higher tenant reimbursement percentage.

Other income at our Total Portfolio increased by $0.9 million during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011 as a result of real estate tax refunds received related to prior years tax assessment appeals.

Property Operating Expenses

Property operating expenses decreased by $6.0 million mainly due to: (i) a $3.1 million decrease related to snow removal costs, (ii) a $2.4 million decrease related to two properties contributed into one of our unconsolidated joint ventures during the fourth quarter of 2011, (iii) a decrease of $0.2 million in contract janitorial and landscaping expenses, (iv) a $1.0 million decrease in utility costs, and (v) a $1.0 million decrease in repairs and maintenance expenses during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 30, 2011. These decreases were offset by an increase of $0.3 million in state and local taxes and a $1.4 million increase in property operating expenses for the five assets acquired/placed into service during the nine-month period ended September 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 nine months ended September 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 nine months ended September 30, 2012.

Real Estate Taxes

Real estate taxes increased by $1.6 million as a result of an increase in real estate tax rates across our same store portfolio during the nine-month period ended September 30, 2012 as compared to the nine-month period ended September 30, 2011. The increase was offset by a $0.7 million decrease in real estate tax expenses for the two properties contributed to an unconsolidated real estate venture in 2011.

Depreciation and Amortization

Depreciation and amortization expense decreased by $9.5 million mainly due to a decrease of $5.0 million during the nine-month period ended September 30, 2012 as compared to the nine-month period ended September 30, 2011 as a result of contributing two properties into an unconsolidated real estate venture during the fourth quarter of 2011. During the nine-month period ended September 30, 2011, we also recorded $4.7 million of out-of-period depreciation and amortization expense adjustments relating to intangible assets representing tenant relationships and in-place leases that should have been written-off in prior periods.

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Interest Income

Interest income increased by $1.3 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 nine-month period ended September 30, 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 nine-month period ended September 30, 2012 upon receipt of payment from the borrower. See "Discontinued Operations" section below.

Interest Expense - Financing obligation

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, and therefore increased by $0.6 million during the nine-month period ended September 30, 2012 as compared to the nine-month period ended September 30, 2011 . The interest primarily represents our partner's 50% share of the net operating income of the property.

Equity in Income of Real Estate Ventures

The decrease in equity in income of real estate ventures of $1.4 million is primarily due to lower net income at the real estate venture properties during thenine-month period ended September 30, 2012 as compared to the nine-month period ended September 30, 2011. We recognized $0.7 million of net losses (inclusive of depreciation and amortization) related to the BDN AI Venture which was formed subsequent to the third quarter of 2011 of which $0.2 million related to acquisition costs incurred to acquire three properties during the nine-month period ended September 30, 2012.

Net Gain on Sales of Interest In Real Estate

During the nine-month period ended September 30, 2011, we recognized a $2.8 million net gain upon the sale of the remaining 11% ownership interest in three properties that we partially sold to one of our unconsolidated Real Estate Ventures in December 2007. We had retained an 11% equity interest in these properties subject to a put/call at fixed prices for a period of three years from the time of the sale. In January 2011, we exercised the put/call which then transferred full ownership in the three properties to the Real Estate Venture. Accordingly, our direct continuing involvement through our 11% interest in the properties ceased as a result of the transfer of the ownership interest.

Loss on Real Estate Venture Formation

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

Loss on Early Extinguishment of Debt

During the nine months ended September 30, 2012, we repurchased (i) $12.0 million of our 7.500% Guaranteed Notes due 2015, (ii) $4.6 million of our 5.400% Guaranteed Notes due 2014, and (iii) $0.3 million of our 5.750% Guaranteed Notes due 2012, which resulted in a net loss on early extinguishment of debt of $1.5 million.

During the nine months ended September 30, 2011, we repurchased (i) $22.9 million of our 5.750% Guaranteed Notes due 2012, and (ii) $1.4 million of our 7.500% Guaranteed Notes due 2015, which resulted in a net loss on early extinguishment of debt of $1.1 million. The loss was offset by the write-off of the unamortized fixed-rate debt premium of $0.5 million related to the prepayment of two of our mortgage loans during the nine months ended September 30, 2011.

Discontinued Operations

During the nine months ended September 30, 2012, we sold one property located in Moorestown, New Jersey, one property located in Herndon, Virginia, one property located in Carlsbad, California and 11 properties located in Exton, Pennsylvania. These properties had total revenues of $7.2 million, property operating expenses of $2.6 million, and depreciation and amortization expense of $2.8 million through their respective dates of sale. In addition, we recognized a deferred gain related to two properties located in Trenton, New Jersey that were sold during the fourth quarter of 2009. The gain was deferred as a result of a note receivable that we held from the buyer in the amount of $22.5 million. The note receivable and accrued interest was paid in full during the second quarter of 2012, prior to its maturity date of October 2016. We recognized a net gain on sale related to these transactions of $34.8 million during the nine months ended September 30, 2012.

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The September 30, 2011 amounts are reclassified to include the operations of the properties sold through the first nine months of 2012 and all properties that were sold through the year ended December 31, 2011. Therefore, the discontinued operations amount for the nine months ended September 30, 2011 includes total revenue of $19.5 million, operating expenses of $7.3 million, and depreciation and amortization expense of $6.9 million.

Net income (loss)

Net income (loss) increased by $33.3 million during the nine-month period ended September 30, 2012 compared to the nine-month period ended September 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 $0.16 during the nine-month period ended September 30, 2012 as compared to a loss per share of $0.05 during the nine-month period ended September 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 September 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares related to the Offering Program. From inception of the Offering Program through September 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 on 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

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underwriting discount and our related 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. 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 prior year.

On September 11, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which it paid on October 19, 2012 to its shareholders of record as of October 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 September 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 September 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 September 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 September 30, 2012, amounted to $503.2 million and $2,008.8 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 September 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,

• 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

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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, and the availability of borrowings under the Credit Facility.

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 borrowings under 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 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.

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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 September 30, 2012 and December 31, 2011, the Operating Partnership maintained cash and cash equivalents of $241.6 million and $0.4 million, respectively. The following are the changes in cash flow from its activities for the nine-month periods ended September 30 (in thousands):

Activity	2012		2011
Operating	$	122,145	$	155,993
Investing	42,865		(162,476		)
Financing	76,196		(4,376		)
Net cash flows	$	241,206	$	(10,859	)

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 $33.8 million in cash from operating activities of the Operating Partnership during the nine months ended September 30, 2012 compared to the nine months ended September 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 17 properties subsequent to September 30, 2011.

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

The net increase of $205.3 million in cash from investing activities of the Operating Partnership during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011 is primarily attributable to the following:

• an increase of $165.3 million of net proceeds from 14 property sales during the first nine months of 2012. There was one property sale during the first nine months of 2011 (see Note 3 to the consolidated financial statements for details);

• a decrease of $31.5 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 in capital expenditures for tenant and building improvements and leasing commissions by $30.3 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011. The decrease in capital expenditures during the first nine 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;

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

• a decrease in advances made for purchase of tenant assets, net of repayments of $1.5 million during the nine months ended September 30, 2012 when compared to the nine months ended September 30, 2011, and;

• 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.

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

• an increase of $47.5 million of investments in unconsolidated Real Estate Ventures during the first nine 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 $0.7 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011.

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The net increase of $80.6 million in cash from financing activities of the Operating Partnership during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011 is mainly due to the following:

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

• a decrease in repayments of the Credit Facility and mortgage notes payable of $337.3 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011;

• an increase in net proceeds received from the issuance of common and preferred shares of the Parent Company of $88.3 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011;

• deferred financing obligations of $0.7 million during the nine months ended September 30, 2012, with no comparable amount during the nine months ended September 30, 2011, and;

• an increase of the net settlement of hedge transactions amounting to $0.6 million during the nine months ended September 30, 2012 compared to the nine months ended September 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 $707.5 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011;

• an increase in the repayment of unsecured notes of $142.4 million during the nine months ended 2012 compared to the nine months ended 2011;

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

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

• an increase in debt financing costs of $4.3 million during the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011;

• a increase in the exercise of stock options of $0.1 million for the nine months ended September 30, 2012 compared to the nine months ended September 30, 2011, and;

• an increase in distributions paid by the Parent Company to its shareholders and on non-controlling interests from $68.4 million during the nine months ended September 30, 2011 to $72.7 million during the nine months ended September 30, 2012.

Capitalization

Indebtedness

During the nine-months ended September 30, 2012, we repurchased $15.1 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		(263		)	8
2015 7.500% Notes	12,011		10,510		(1,284		)	10
	$	16,950	$	15,113	$	(1,549	)	$	18

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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 September 30, 2012 and December 31, 2011:

	September 30, 2012			December 31, 2011
	(dollars in thousands)
Balance:
Fixed rate	$	2,411,989		$	2,061,728
Variable rate — unhedged	100,000			338,774
Total	$	2,511,989		$	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 September 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 September 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 September 30, 2012, the Operating Partnership had guaranteed repayment of approximately $0.6 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. These costs are shown within the Operating Partnership's consolidated statements of operations as "Preferred unit redemption charge". There were no comparable charges for the prior year.

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On September 11, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on October 19, 2012 to unitholders of record as of October 5, 2012.

On September 11, 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 September 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares under the Offering Program, and accordingly, the Operating Partnership did not issue any common partnership units in connection with the Parent Company's Offering Program. During the nine-month period ended September 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 September 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 September 30, 2012, the Operating Partnership had $2,008.8 million of total unsecured debt and $503.2 million of mortgage debt with $3.3 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.

During the third quarter of 2012, the Operating Partnership sold its entire remaining portfolio of available-for-sale securities, totaling $42.1 million, recognizing a $0.1 million loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Operating Partnership's best interest.

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 Operating Partnership believes that inflationary increases in expenses will be partially offset by expense reimbursement and contractual rent increases.

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Commitments and Contingencies

The following table outlines the timing of payment requirements related to the Operating Partnership’s contractual commitments as of September 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)	$	503,181	$	67,087	$	112,791	$	126,984	$	196,319
Unsecured term loan	600,000		—		150,000		250,000		200,000
Unsecured debt (a)	1,408,808		—		455,198		875,000		78,610
Ground leases (b)	296,663		455		5,545		5,727		284,936
Development contracts (c)	408		408		—		—		—
Interest expense (d)	512,667		107,738		189,070		108,772		107,087
Other liabilities (e)	12,388		—		—		—		12,388
	$	3,334,115	$	175,688	$	912,604	$	1,366,483	$	879,340

(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 September 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 September 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 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

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Partnership recorded a liability of $0.7 million and this amount will accrete up to $2.9 million through September 2019. As of September 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 September 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 $9.0 million as of September 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 is currently in negotiations to extend the development agreements related to these land parcels to December 31, 2015, and believes that an extension of these agreements is probable.

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 September 30, 2012, its consolidated debt consisted of $503.2 million of mortgage loans and $1,330.2 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 $27.2 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 $29.9 million.

As of September 30, 2012, based on prevailing interest rates and credit spreads, the fair value of the Operating Partnership’s $1,330.2 million of unsecured notes was $1,458.2 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 September 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 September 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 September 30, 2012 and December 31, 2011, respectively. For sensitivity purposes, 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 September 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 September 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 September 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 September 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

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performance, FFO should be compared with its reported net income/(loss) attributable to common unit holders and considered in addition to cash flows in accordance with GAAP, as presented in our consolidated financial statements.

The following table presents a reconciliation of net income (loss) attributable to common unit holders to FFO for the three and nine-month periods ended September 30, 2012 and 2011:

	Three-month periods ended						Nine-month periods ended
	September 30,						September 30,
	2012			2011			2012			2011
	(amounts in thousands, except share information)
Net income (loss) attributable to common unitholders	$	14,209		$	4,492		$	23,019		$	(6,491	)
Add (deduct):
Amount allocated to unvested restricted unitholders	95			121			286			384
Net gain on sale of interests in real estate	—			—			—			(2,791		)
Loss on real estate venture formation	950			—			950			—
Net gain on disposition of discontinued operations	(9,940		)	—			(34,774		)	(3,836		)
Depreciation and amortization:
Real property — continuing operations	39,628			39,275			117,253			119,619
Leasing costs including acquired intangibles — continuing operations	9,067			12,378			30,164			36,698
Real property — discontinued operations	—			2,230			2,459			6,664
Leasing costs including acquired intangibles — discontinued operations	6			66			291			193
Company’s share of unconsolidated real estate ventures	3,971			2,128			10,528			6,553
Funds from operations	$	57,986		$	60,690		$	150,176		$	156,993
Funds from operations allocable to unvested restricted shareholders	(254		)	(359		)	(769		)	(983		)
Funds from operations available to common share and unit holders (FFO)	$	57,732		$	60,331		$	149,407		$	156,010
Weighted-average shares/units outstanding — fully diluted	146,785,731			146,651,211			146,408,921			146,341,612

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.

68

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 nine-month period ended September 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
July	—	—		—	539,200
August	—	—		—	539,200
September	—	—		—	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.

69

Item 5. Other Information

None.

Item 6. Exhibits

(a) Exhibits

10.1	Summary of Trustee Compensation*
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 September 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.

* Management contract or compensatory plan or arrangement.

70

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:	November 2, 2012	By:	/s/ Gerard H. Sweeney
			Gerard H. Sweeney, President and Chief Executive Officer
			(Principal Executive Officer)
Date:	November 2, 2012	By:	/s/ Howard M. Sipzner
			Howard M. Sipzner, Executive Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	November 2, 2012	By:	/s/ Gabriel J. Mainardi
			Gabriel J. Mainardi, Vice President and Chief Accounting Officer
			(Principal Accounting Officer)

71

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:	November 2, 2012	By:	/s/ Gerard H. Sweeney
			Gerard H. Sweeney, President and Chief Executive Officer
			(Principal Executive Officer)
Date:	November 2, 2012	By:	/s/ Howard M. Sipzner
			Howard M. Sipzner, Executive Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	November 2, 2012	By:	/s/ Gabriel J. Mainardi
			Gabriel J. Mainardi, Vice President and Chief Accounting Officer
			(Principal Accounting Officer)

72

Index to Exhibits

10.1	Summary of Trustee Compensation*
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 September 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.

* Management contract or compensatory plan or arrangement

73

EX-10.1

Exhibit 10.1

SCHEDULE I

Trustee Compensation

1.Annual Fee:

a.$45,000.

b.payable at annual meeting of shareholders.

c. payable in cash or common shares (valued at closing price on date of annual meeting of shareholders), at the election of each Trustee.

d.cash portion is eligible for deferral into the Deferred Compensation Plan.

2.Annual Equity Award:

a.$60,000 in “restricted” common share rights.

b. number of common share rights computed based on closing price of the common shares on date of annual meeting of shareholders.

c. common share rights vest in three equal annual installments, commencing on the first anniversary of the award date, subject to accelerated vesting upon a change of control or termination of service on account of death, disability or retirement. Upon vesting, a number of common shares are delivered equal to the number of shares rights that vested.

d.unvested common share rights are entitled to dividend equivalents.

e.common share rights are not eligible for deferral into the Deferred Compensation Plan.

3.Per Board Meeting Fee:

a.$1,500.

b.payable in cash.

c.eligible for deferral into the Deferred Compensation Plan.

4.Per Committee Meeting Fee:

a.$1,000.

b.payable in cash.

c.not eligible for deferral into the Deferred Compensation Plan.

5.Per Informal Board Informational Meeting Fee:

a.$1,500.

b.payable in cash.

c.not eligible for deferral into the Deferred Compensation Plan.

6.Chair Fees:

a.Board Chair - $45,000 per year, payable in cash, at annual meeting of shareholders.

b.Audit Committee Chair - $15,000 per year, payable in cash, at annual meeting of shareholders.

c. Compensation Committee Chair - $10,000 per year, payable in cash, at annual meeting of shareholders.

d. Corporate Governance Committee Chair - $10,000 per year, payable in cash, at annual meeting of shareholders.

e.Chair fees are not eligible for deferral into the Deferred Compensation Plan.

7.Miscellaneous: Fees are payable for meeting attendance, whether in person or by phone.

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:	November 2, 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:	November 2, 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:	November 2, 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:	November 2, 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 September 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:	November 2, 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 September 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:	November 2, 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 September 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:	November 2, 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 September 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:	November 2, 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)

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

Earnings per Common Partnership Unit

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common unitholders	4,200			4,200			2,742			2,742
Discontinued operations attributable to common unitholders	10,009			10,009			1,750			1,750
Net income attributable to common unitholders	$	14,209		$	14,209		$	4,492		$	4,492
Denominator
Weighted-average units outstanding	146,082,206			146,082,206			145,372,247			145,372,247
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average units outstanding	146,082,206			146,785,731			145,372,247			146,651,211
Earnings per Common Partnership Unit:
Income from continuing operations attributable to common unitholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common unitholders	0.07			0.07			0.01			0.01
Net income attributable to common unitholders	$	0.10		$	0.10		$	0.03		$	0.03

	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Amount allocable to unvested restricted unitholders	(286		)	(286		)	(384		)	(384		)
Preferred unit dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(13,622		)	(13,622		)	(15,656		)	(15,656		)
Discontinued operations attributable to common unitholders	36,641			36,641			9,165			9,165
Net income (loss) attributable to common unitholders	$	23,019		$	23,019		$	(6,491	)	$	(6,491	)
Denominator
Weighted-average units outstanding	145,842,872			145,842,872			145,027,663			145,027,663
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.09	)	$	(0.09	)	$	(0.11	)	$	(0.11	)
Discontinued operations attributable to common unitholders	0.25			0.25			0.06			0.06
Net income (loss) attributable to common unitholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

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Deferred Costs (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Deferred Costs (Textuals) [Abstract]
Capitalized internal direct leasing costs	$ 1.3	$ 1.4	$ 4.0	$ 4.7

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Real Estate Investments (Gross Carrying Value of Company's Properties) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Gross carrying value of rental properties
Land	$ 649,689	$ 677,891
Building and improvements	3,530,214	3,631,388
Tenant improvements	480,386	483,801
Rental properties	$ 4,660,289	$ 4,793,080

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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $)	9 Months Ended			9 Months Ended		12 Months Ended				0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Series C Preferred Stock [Member]	Sep. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Oct. 19, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Oct. 05, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Sep. 30, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P.	Oct. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares	Sep. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares	Oct. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member]	Sep. 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	$ 24,820,000	$ 23,505,000	$ 23,895,000		$ 24,820,000	$ 23,895,000		$ 21,600,000	$ 23,505,000
Percentage of Preferential return					6.90%	0.00%					7.375%		6.90%
Dividends, Preferred Stock, Cash	7,832,000	5,994,000		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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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Intangible assets
Total Cost	$ 138,750	$ 176,983
Accumulated Amortization	(86,175)	(106,468)
Intangible Assets, net	52,575	70,515
In-place lease value [Member]
Intangible assets
Total Cost	72,099	91,426
Accumulated Amortization	(45,704)	(55,498)
Intangible Assets, net	26,395	35,928
Tenant relationship value [Member]
Intangible assets
Total Cost	58,811	72,813
Accumulated Amortization	(38,716)	(45,114)
Intangible Assets, net	20,095	27,699
Above market leases acquired [Member]
Intangible assets
Total Cost	7,840	12,744
Accumulated Amortization	(1,755)	(5,856)
Intangible Assets, net	6,085	6,888
Below market leases acquired [Member]
Intangible assets
Total Cost	73,342	75,685
Accumulated Amortization	(43,518)	(40,579)
Intangible Assets, net	$ 29,824	$ 35,106

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Commitments and Contingencies (Ground Rent) (Details) (Ground Rent [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Ground Rent [Member]
Minimum future rental payments on non-cancelable leases
2012 (three months remaining)	$ 455
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	$ 288,754

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Summary of Significant Accounting Policies (Held-to-Maturity Securities) (Details) (Banco Santander Bonds [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012
Banco Santander Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash Received for Held-to-Maturity Securities Sold	$ 42,030
Principal Amount of Held-to-maturity Securities Sold	42,105
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	$ (75)

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Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

	September 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	72,099	$	(45,704	)	$	26,395
Tenant relationship value	58,811		(38,716		)	20,095
Above market leases acquired	7,840		(1,755		)	6,085
Total	$	138,750	$	(86,175	)	$	52,575
Below market leases acquired	$	73,342	$	(43,518	)	$	29,824

	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 (three months remaining)	$	3,603	$	1,642
2013	12,076		6,284
2014	9,299		4,741
2015	6,909		2,597
2016	4,436		1,704
Thereafter	16,252		12,856
Total	$	52,575	$	29,824

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Share Based and Deferred Compensation (Details Textuals) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2011 Stock Option [Member]	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2011 Stock Option [Member]	Sep. 30, 2012 Restricted Share Awards [Member]	Sep. 30, 2011 Restricted Share Awards [Member]	Sep. 30, 2012 Restricted Share Awards [Member] Age	Sep. 30, 2011 Restricted Share Awards [Member]	Sep. 30, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2011 Restricted Performance Share Units Plan [Member]	Sep. 30, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2011 Restricted Performance Share Units Plan [Member]	Apr. 02, 2009 Restricted Performance Share Units Plan [Member]	Sep. 30, 2012 Employee Share Purchase Plan [Member]	Sep. 30, 2011 Employee Share Purchase Plan [Member]	Sep. 30, 2012 Employee Share Purchase Plan [Member]	Sep. 30, 2011 Employee Share Purchase Plan [Member]	Sep. 30, 2012 Deferred Compensation Plan [Member]	Sep. 30, 2011 Deferred Compensation Plan [Member]	Sep. 30, 2012 Executive Officer [Member] Restricted Share Awards [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 Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term, maximum			10 years									7 Years
Share Based and Deferred Compensation (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,402,684		3,402,684		3,599,672	3,402,684		3,402,684
Unvested options						666,918		666,918
Unrecognized compensation expenses						$ 1,300,000		$ 1,300,000		$ 4,000,000		$ 4,000,000
Weighted average period over which options will be recognized								1 year 1 month 6 days				2 years 2 months 12 days
Stock-based compensation expense, capitalized	500,000	400,000	1,400,000	1,100,000		400,000	400,000	1,100,000	1,100,000	200,000	200,000	500,000	500,000	200,000	100,000	600,000	300,000
Recognized compensation expense awards nominal amounts capitalized						100,000	100,000	300,000	300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												three to seven years from the initial grant date
Compensation expense recognized	1,800,000	1,600,000	5,500,000	4,800,000						800,000	800,000	2,300,000	2,400,000	700,000	500,000	2,100,000	1,200,000				100,000	100,000
Vesting Period, Minimum																3 years
Aggregate share-based awards awarded to executives																			1,250,000		1,250,000					193,270	260,571	122,119	118,751
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
Number of employees eligible for qualifying retirement														1		1
Number of employees eligible for qualifying retirement																									1
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	$ 300,000	$ 300,000
Deferred Compensation Arrangement With Individual Increase In Compensation Expense																							500,000	800,000
Deferred Compensation Arrangement With Individual Decrease In Compensation Expense																							500,000
Deferred compensation arrangement with individual increase in compensation expense.																								$ 800,000
Number of shares to be issued under deferred compensation plan included in total shares outstanding																							300,000	300,000
Award vesting term, minimum			1 year									3 Years

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Debt Obligations (Consolidated Debt Obligations Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Consolidated debt obligations
Plus: premiums/(discounts), net	$ (5,400)
Total mortgage indebtedness	502,123		511,061
Total Debt Obligations	2,506,589		2,393,995
Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	503,181		512,391
Plus: premiums/(discounts), net	(1,058)		(1,330)
Total mortgage indebtedness	502,123		511,061
Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	2,008,808		1,888,111
Plus: premiums/(discounts), net	(4,342)		(5,177)
Total unsecured indebtedness	2,004,466		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
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	216,819		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
Revolving Credit Facility [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Debt instrument, basis spread on variable rate	0.725%
Newtown Square/Berwyn Park/Libertyview [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	55,289		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	1,317		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	93,625		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	89,524		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	198,592		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	$ 42,834		$ 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 (the "New 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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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of consolidated net operating income
Consolidated net operating income	$ 84,316	$ 84,030	$ 253,198	$ 251,150
Less:
Interest expense	(32,620)	(32,346)	(99,745)	(99,477)
Deferred financing costs	(1,218)	(1,846)	(3,790)	(3,844)
Depreciation and amortization	(48,738)	(51,943)	(147,618)	(157,157)
Administrative expenses	(6,080)	(6,177)	(18,209)	(18,311)
Plus:
Interest income	311	523	2,635	1,385
Historic tax credit transaction income	11,840	12,026	11,840	12,026
Interest expense — financing obligation	(230)	0	(608)	0
Equity in income of real estate ventures	500	418	1,382	2,739
Net gain on sales of interests in real estate ventures	0	0	0	2,791
Loss on real estate venture formation	(950)	0	(950)	0
Gain (loss) on early extinguishment of debt	(51)	176	(1,549)	(580)
Income (loss) from continuing operations	7,080	4,861	(3,414)	(9,278)
Income from discontinued operations	10,009	1,750	36,641	9,165
Net income (loss)	$ 17,089	$ 6,611	$ 33,227	$ (113)

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Commitments and Contingencies (Details) (USD $)	9 Months Ended
	Sep. 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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Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 Y
Option activity
Outstanding at beginning of year, shares	3,599,672
Granted, shares	0
Exercised, shares	(165,159)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(31,829)
Outstanding at end of year, shares	3,402,684
Vested/Exercisable, shares	2,735,766
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.50
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 4.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 14.33
Outstanding at end of year, Weighted Average Exercise Price	$ 14.64
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.80
Outstanding at beginning of year, Weighted Average Remaining Contractual Term (in years)	7.20
Outstanding at end of year, Weighted Average Remaining Contractual Term (in years)	6.20
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	6 years 1 month 2 days
Outstanding at beginning of year, Aggregate Intrinsic Value	$ (18,015,060)
Outstanding at end of year, Aggregate Intrinsic Value	(9,559,637)
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ (9,857,702)

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Segment Information

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

As of September 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 September 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,174,597	$	962,235	$	1,189,014	$	545,104	$	308,371	$	259,304	$	221,664	$	—		$	4,660,289
Construction-in-progress															43,449			43,449
Land inventory															95,500			95,500
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 September 30, 2012:
Total revenue	$	38,526	$	33,025	$	26,516	$	20,553	$	8,826	$	8,275	$	5,141	$	(479	)	$	140,383
Property operating expenses, real estate taxes and third party management expenses	13,588		12,431		10,637		10,030		3,762		3,484		2,639		(504		)	56,067
Net operating income	$	24,938	$	20,594	$	15,879	$	10,523	$	5,064	$	4,791	$	2,502	$	25		$	84,316
For the three-months ended September 30, 2011:
Total revenue	$	36,812	$	31,097	$	29,296	$	20,743	$	9,334	$	7,453	$	4,968	$	(302	)	$	139,401
Property operating expenses, real estate taxes and third party management expenses	13,493		11,539		10,868		10,008		3,664		3,233		3,009		(443		)	55,371
Net operating income	$	23,319	$	19,558	$	18,428	$	10,735	$	5,670	$	4,220	$	1,959	$	141		$	84,030
For the nine-months ended September 30, 2012:
Total revenue	$	113,565	$	98,086	$	79,919	$	61,442	$	26,762	$	23,959	$	14,942	$	(1,305	)	$	417,370
Property operating expenses, real estate taxes and third party management expenses	39,643		37,082		31,158		28,697		10,875		10,497		7,498		(1,278		)	164,172
Net operating income	$	73,922	$	61,004	$	48,761	$	32,745	$	15,887	$	13,462	$	7,444	$	(27	)	$	253,198
For the nine-months ended September 30, 2011:
Total revenue	$	111,949	$	93,520	$	89,936	$	60,554	$	27,409	$	23,203	$	14,551	$	(855	)	$	420,267
Property operating expenses, real estate taxes and third party management expenses	42,112		34,962		34,002		30,611		10,666		9,740		8,015		(991		)	169,117
Net operating income	$	69,837	$	58,558	$	55,934	$	29,943	$	16,743	$	13,463	$	6,536	$	136		$	251,150

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 September 30,						Nine-month periods ended September 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,316		$	84,030		$	253,198		$	251,150
Less:
Interest expense	(32,620		)	(32,346		)	(99,745		)	(99,477		)
Deferred financing costs	(1,218		)	(1,846		)	(3,790		)	(3,844		)
Depreciation and amortization	(48,738		)	(51,943		)	(147,618		)	(157,157		)
Administrative expenses	(6,080		)	(6,177		)	(18,209		)	(18,311		)
Plus:
Interest income	311			523			2,635			1,385
Historic tax credit transaction income	11,840			12,026			11,840			12,026
Interest expense - financing obligation	(230		)	—			(608		)	—
Equity in income of real estate ventures	500			418			1,382			2,739
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on real estate venture formation	(950		)	—			(950		)	—
Gain (loss) on early extinguishment of debt	(51		)	176			(1,549		)	(580		)
Income (loss) from continuing operations	7,080			4,861			(3,414		)	(9,278		)
Income from discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	$	17,089		$	6,611		$	33,227		$	(113	)

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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 A Properties Room sqft Real_Estate_Ventures Buildings	Dec. 31, 2011
Investment in Unconsolidated Ventures (Textuals) [Abstract]
Company's share of equity (Company's basis)	$ 179,037	$ 115,807
Number of unconsolidated Real Estate Ventures	19
Number of real estate ventures that owns 51 office buildings	15
Number of office buildings owned by 15 Real Estate Ventures	54
Net rentable square feet of 51 office buildings owned the 15 Real Estate Ventures	7,000,000
Number of real estate ventures that owns undeveloped land	3
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	24
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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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Operating Leases Future Minimum Payments Due

2012 (three months remaining)	$	455
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,754

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Reportable_Segments	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments			7
Real estate investments, at cost:
Operating properties	$ 4,660,289		$ 4,660,289		$ 4,793,080
Construction-in-progress	43,449		43,449		25,083
Land inventory	95,500		95,500		109,008
Total revenue	140,383	139,401	417,370	420,267
Property operating expenses, real estate taxes and third party management expenses	56,067	55,371	164,172	169,117
Net operating income	84,316	84,030	253,198	251,150
Pennsylvania Suburbs [Member]
Real estate investments, at cost:
Operating properties	1,174,597		1,174,597		1,218,071
Total revenue	38,526	36,812	113,565	111,949
Property operating expenses, real estate taxes and third party management expenses	13,588	13,493	39,643	42,112
Net operating income	24,938	23,319	73,922	69,837
Philadelphia CBD [Member]
Real estate investments, at cost:
Operating properties	962,235		962,235		953,870
Total revenue	33,025	31,097	98,086	93,520
Property operating expenses, real estate taxes and third party management expenses	12,431	11,539	37,082	34,962
Net operating income	20,594	19,558	61,004	58,558
Metropolitan, D.C. [Member]
Real estate investments, at cost:
Operating properties	1,189,014		1,189,014		1,255,803
Total revenue	26,516	29,296	79,919	89,936
Property operating expenses, real estate taxes and third party management expenses	10,637	10,868	31,158	34,002
Net operating income	15,879	18,428	48,761	55,934
New Jersey/ Delaware [Member]
Real estate investments, at cost:
Operating properties	545,104		545,104		545,657
Total revenue	20,553	20,743	61,442	60,554
Property operating expenses, real estate taxes and third party management expenses	10,030	10,008	28,697	30,611
Net operating income	10,523	10,735	32,745	29,943
Richmond, Virginia [Member]
Real estate investments, at cost:
Operating properties	308,371		308,371		307,698
Total revenue	8,826	9,334	26,762	27,409
Property operating expenses, real estate taxes and third party management expenses	3,762	3,664	10,875	10,666
Net operating income	5,064	5,670	15,887	16,743
Austin, Texas [Member]
Real estate investments, at cost:
Operating properties	259,304		259,304		257,694
Total revenue	8,275	7,453	23,959	23,203
Property operating expenses, real estate taxes and third party management expenses	3,484	3,233	10,497	9,740
Net operating income	4,791	4,220	13,462	13,463
California [Member]
Real estate investments, at cost:
Operating properties	221,664		221,664		254,287
Total revenue	5,141	4,968	14,942	14,551
Property operating expenses, real estate taxes and third party management expenses	2,639	3,009	7,498	8,015
Net operating income	2,502	1,959	7,444	6,536
Corporate [Member]
Real estate investments, at cost:
Operating properties	0		0		0
Construction-in-progress	43,449		43,449		25,083
Land inventory	95,500		95,500		109,008
Total revenue	(479)	(302)	(1,305)	(855)
Property operating expenses, real estate taxes and third party management expenses	(504)	(443)	(1,278)	(991)
Net operating income	25	141	(27)	136
Subsidiaries [Member]
Real estate investments, at cost:
Operating properties	4,660,289		4,660,289		4,793,080
Construction-in-progress	43,449		43,449		25,083
Land inventory	95,500		95,500		109,008
Total revenue	$ 140,383	$ 139,401	$ 417,370	$ 420,267

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Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2012

Discontinued Operations and Disposal Groups [Abstract]

Revenue and expenses information for the property classified as discontinued operations

	Three-month period ended September 30, 2011			Nine-month period ended September 30, 2011
Revenue:
Rents	$	5,450		$	16,742
Tenant reimbursements	797			2,728
Termination fees	33			33
Other	(2		)	—
Total revenue	6,278			19,503
Expenses:
Property operating expenses	1,573			5,212
Real estate taxes	659			2,105
Depreciation and amortization	2,296			6,857
Total operating expenses	4,528			14,174
Income from discontinued operations before gain on sale of interests in real estate	1,750			5,329
Net gain on disposition of discontinued operations	—			3,836
Income from discontinued operations	$	1,750		$	9,165

	Three-month period ended September 30, 2012			Nine-month period ended September 30, 2012
Revenue:
Rents	$	271		$	6,384
Tenant reimbursements	(16		)	742
Termination fees	4			11
Other	(1		)	88
Total revenue	258			7,225
Expenses:
Property operating expenses	154			1,855
Real estate taxes	29			755
Depreciation and amortization	6			2,750
Total operating expenses	189			5,360
Other income (expense):
Interest income	—			2
Income from discontinued operations before gain on sale of interests in real estate	69			1,867
Net gain on disposition of discontinued operations	9,940			34,774
Income from discontinued operations	$	10,009		$	36,641

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

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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of results of operations of Real Estate Ventures
Company's share of income (Company's basis)	$ 500,000	$ 418,000	$ 1,382,000	$ 2,739,000
Loss on real estate venture formation	(950,000)	0	(950,000)	0
Unconsolidated real estate ventures [Member]
Summary of results of operations of Real Estate Ventures
Revenue	42,772,000	36,345,000	120,644,000	108,743,000
Operating expenses	18,753,000	15,863,000	51,819,000	46,407,000
Interest expense, net	10,233,000	10,326,000	31,100,000	31,999,000
Depreciation and amortization	12,947,000	9,869,000	36,067,000	28,836,000
Net income	839,000	287,000	1,658,000	1,501,000
Guaranteed repayment of loans on behalf of a certain Real Estate Venture	$ 600,000		$ 600,000

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Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator
Income (loss) from continuing operations, Basic	$ 7,080	$ 4,861	$ (3,414)	$ (9,278)
Income (loss) from continuing operations, Diluted	7,080	4,861	(3,414)	(9,278)
Net income (loss) from continuing operations attributable to non-controlling interests, Basic	(78)	(276)	244	88
Net income (loss) from continuing operations attributable to non-controlling interests, Diluted	(78)	(276)	244	88
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(286)	(384)
Amount allocable to unvested restricted shareholders, Diluted	(95)	(121)	(286)	(384)
Preferred share/unit dividends, Basic	(2,785)	(1,998)	(7,832)	(5,994)
Preferred share/unit dividends, Diluted	(2,785)	(1,998)	(7,832)	(5,994)
Redemption Premium, Basic	0	0	(2,090)	0
Redemption Premium, Diluted			(2,090)	0
Income (loss) from continuing operations available to common shareholders/unitholders, Basic	4,122	2,466	(13,378)	(15,568)
Income (loss) from continuing operations available to common shareholders/unitholders, Diluted	4,122	2,466	(13,378)	(15,568)
Income from discontinued operations	10,009	1,750	36,641	9,165
Income (loss) from discontinued operations, Diluted	10,009	1,750	36,641	9,165
Discontinued operations attributable to non-controlling interests - LP units	(182)	(86)	(669)	(234)
Discontinued operations attributable to non-controlling interests, diluted	(182)	(86)	(669)	(234)
Discontinued operations attributable to common shareholders, Basic	9,827	1,664	35,972	8,931
Discontinued operations attributable to common shareholders, Diluted	9,827	1,664	35,972	8,931
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	13,949	4,130	22,594	(6,637)
Net income (loss) available to common shareholders/unitholders, Diluted	$ 13,949	$ 4,130	$ 22,594	$ (6,637)
Denominator
Weighted-average units outstanding, Basic	143,424,485	135,562,487	143,182,911	135,164,424
Contingent securities/Stock based compensation	703,525	1,278,964
Weighted-average shares/units outstanding, Diluted	144,128,010	136,841,451	143,182,911	135,164,424
Earnings per Common Share:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Discontinued operations attributable to common shareholders/unitholders, Basic	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Discontinued operations attributable to common shareholders, Diluted	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.10	$ 0.03	$ 0.16	$ (0.05)

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Debt Obligations (Details Textuals 2) (USD $) In Millions, unless otherwise specified		3 Months Ended	9 Months Ended
	Sep. 30, 2012 Bank Term Loan And The Credit Facility [Member] Federal Funds Rate [Member]	Sep. 30, 2011 Unsecured Debt [Member]	Sep. 30, 2012 Unsecured Debt [Member] Seven Year Term Loan [Member]	Sep. 30, 2012 Unsecured Debt [Member] Three and Four Year Term Loan [Member]	Sep. 30, 2012 Secured Debt [Member]	Sep. 30, 2011 Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate		0.98%			6.72%	6.83%
Line of Credit Facility, Interest Rate During Period		0.95%
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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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011 Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 7,226,000		$ 7,226,000		$ 18,186,000
Number of properties sold					2
Gross deferred gain on sale of properties					12,900,000
Investment Income, Interest	311,000	523,000	2,635,000	1,385,000
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		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		12,900,000
Investment Income, Interest			$ 1,000,000

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental disclosure:
Capitalized interest	$ 1,978	$ 1,450
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Supplemental disclosure:
Capitalized interest	$ 1,978	$ 1,450

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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Company's estimates of fair value differ from the carrying amounts
Mortgage notes payable, Carrying Amount	$ 503,181		$ 512,391
Mortgage notes payable, Fair Value	548,413		545,784
Unsecured notes payable, Carrying Amount	1,330,198		1,496,501
Unsecured notes payable, Fair Value	1,458,187		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	$ 9,790		$ 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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Organization of The Parent Company and The Operating Partnership (Details)	Sep. 30, 2012 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	24
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	24,500,000
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture	424
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	19
Net rentable square feet	7,000,000
Wholly-owned management company subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Net rentable square feet	31,900,000
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
Total Properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	219
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	194
Industrial facilities [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	19
Mixed-use properties [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	5
Development Property [Member]
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract]
Number of properties with ownership interest	1

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

Fair value of liabilities on recurring basis

	Fair Value Measurements at Reporting Date Using:
	September 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	18,741	$	—	$	18,741	$	—

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

The following table sets forth the details of the remaining available-for-sale securities sold during the third quarter of 2012 (in thousands):

	Available-for-sale Securities Sold
	Cash Received		Principal Amount		Gain (loss)
Available-for-sale securities	$	42,030	$	42,105	$	(75	)

The Company did not hold any available-for-sale securities as of September 30, 2012 or December 31, 2011.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 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 fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

Revenue Recognition

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.

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

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.

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.

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

The Company estimates the fair value of its derivatives and available-for-sale securities 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.

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.

Securities held-to-maturity

Available-for-sale securities

During the third quarter of 2012, the Company sold its entire remaining portfolio of available-for-sale securities, totaling $42.1 million, recognizing a $0.1 million loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Company's best interest.

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 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Annual amortization of intangible assets and liabilities
Total	$ 52,575	$ 70,515
Assets [Member]
Annual amortization of intangible assets and liabilities
2012 (three months remaining)	3,603
2013	12,076
2014	9,299
2015	6,909
2016	4,436
Thereafter	16,252
Total	52,575
Liabilities [Member]
Annual amortization of intangible assets and liabilities
2012 (three months remaining)	1,642
2013	6,284
2014	4,741
2015	2,597
2016	1,704
Thereafter	12,856
Total	$ 29,824

XML

Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 02, 2010
Summary Of Significant Accounting Policies (Textuals) [Abstract]
Development costs for land	$ 9,000,000		$ 9,000,000
Revenue increased by straight-line rent adjustment	4,300,000	4,900,000	16,000,000	13,200,000
Increased revenue due to amortization of deferred rent	600,000	600,000	1,800,000	1,700,000
Decrease in revenue due to amortization of lease incentives	100,000	400,000	600,000	1,000,000
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	4,030,218		4,030,218		3,600,000
Common shares available for future awards	5,290,717		5,290,717
Options awarded, term			one to ten-year
Award vesting term, minimum			1 year
Award vesting term, maximum			10 years
Stock-based compensation expense	1,800,000	1,600,000	5,500,000	4,800,000
Stock-based compensation expense, capitalized	500,000	400,000	1,400,000	1,100,000
Distributable income minimum percentage	90.00%
PJP VII [Member]
Variable Interest Entity [Line Items]
Guarantor Obligations, Current Carrying Value	600,000		600,000
Banco Santander Bonds [Member]
Variable Interest Entity [Line Items]
Principal Amount of Held-to-maturity Securities Sold	42,105,000
Summary Of Significant Accounting Policies (Textuals) [Abstract]
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	$ (75,000)

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Real Estate Investments (Tables)

9 Months Ended

Sep. 30, 2012

Real Estate [Abstract]

Gross carrying value of the Company's Properties

	September 30, 2012		December 31, 2011
Land	$	649,689	$	677,891
Building and improvements	3,530,214		3,631,388
Tenant improvements	480,386		483,801
	$	4,660,289	$	4,793,080

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Investment in Unconsolidated Ventures (Tables)

9 Months Ended

Sep. 30, 2012

Equity Method Investments and Joint Ventures [Abstract]

Financial position of unconsolidated Real Estate Ventures

	September 30, 2012		December 31, 2011
Net property	$	925,227	$	846,643
Other assets	180,957		110,520
Other liabilities	55,592		48,798
Debt	740,885		745,830
Equity	309,707		162,535
Company’s share of equity (Company’s basis)	179,037		115,807

Summary of results of operations of unconsolidated Real Estate Ventures

	Three-month periods ended September 30,				Nine-month periods ended September 30,
	2012		2011		2012		2011
Revenue	$	42,772	$	36,345	$	120,644	$	108,743
Operating expenses	18,753		15,863		51,819		46,407
Interest expense, net	10,233		10,326		31,100		31,999
Depreciation and amortization	12,947		9,869		36,067		28,836
Net income (loss)	839		287		1,658		1,501
Company’s share of income (Company’s basis)	500		418		1,382		2,739

XML

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ 33,227	$ (113)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	150,362	164,014
Amortization of deferred financing costs	3,790	3,844
Amortization of debt discount/(premium), net	1,095	1,028
Amortization of stock compensation costs	3,740	4,201
Shares used for employee taxes upon vesting of share awards	(2,232)	(1,012)
Straight-line rent income	(17,792)	(14,925)
Amortization of above (below) Market Leases, Net	(4,468)	(4,011)
Straight-line ground rent expense	1,423	1,450
Provision for doubtful accounts	1,363	1,190
Real estate venture income in excess of distributions	(1,024)	(1,020)
Net gain on sale of interests in real estate	(34,773)	(6,627)
Loss on real estate venture formation	950	0
Loss on early extinguishment of debt	1,549	580
Historic tax credit transaction income	(11,840)	(12,026)
Changes in assets and liabilities:
Accounts receivable	1,580	2,130
Other assets	(7,200)	(5,000)
Accounts payable and accrued expenses	9,565	21,382
Deferred income, gains and rent	(4,681)	(4,376)
Deferred financing obligation	(1,314)	0
Other liabilities	(1,175)	5,284
Net cash from operating activities	122,145	155,993
Cash flows from investing activities:
Acquisition of properties	(9,226)	(40,674)
Investments in Available-for-sale Securities, Debt	(98,250)	0
Proceeds from the sale of available-for-sale securities	98,250	0
Sales of properties, net	170,918	5,639
Proceeds from repayment of mortgage notes receivable	23,930	0
Capital expenditures	(73,649)	(97,557)
Advances for purchase of tenant assets, net of repayments	(13)	(1,552)
Loan provided to unconsolidated Real Estate Venture partner	0	(1,045)
Investment in unconsolidated Real Estate Ventures	(49,763)	(2,259)
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	2,779	3,432
Leasing costs	(22,111)	(28,460)
Net cash from (used in) investing activities	42,865	(162,476)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	407,502
Repayments of Credit Facility	(297,000)	(424,502)
Repayments of mortgage notes payable	(9,209)	(218,959)
Proceeds from unsecured notes	0	321,498
Deferred financing obligation non-cash interest expense	701	0
Net Proceeds from Issuance of Common Stock	0	7,966
Net Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Redemption of preferred units	(50,188)	0
Repayments from unsecured notes	(167,841)	(25,366)
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,462)	(4,199)
Exercise of stock options	748	659
Distributions paid to shareholders/unitholders	(71,523)	(67,119)
Distributions to noncontrolling interest	(1,196)	(1,243)
Net cash from (used in) financing activities	76,196	(4,376)
Increase (decrease) in cash and cash equivalents	241,206	(10,859)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	241,616	5,706
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2012 and 2011 of $1,978 and $1,450, respectively	83,618	78,091
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,270)	(2,114)
Change in capital expenditures financed through retention payable at period end	284	(5,863)
Change in unfunded tenant allowance	(1,411)	(442)
Distributions payable	24,820	23,505
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income (loss)	33,227	(113)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	150,362	164,014
Amortization of deferred financing costs	3,790	3,844
Amortization of debt discount/(premium), net	1,095	1,028
Amortization of stock compensation costs	3,740	4,201
Shares used for employee taxes upon vesting of share awards	(2,232)	(1,012)
Straight-line rent income	(17,792)	(14,925)
Amortization of above (below) Market Leases, Net	(4,468)	(4,011)
Straight-line ground rent expense	1,423	1,450
Provision for doubtful accounts	1,363	1,190
Real estate venture income in excess of distributions	(1,024)	(1,020)
Net gain on sale of interests in real estate	(34,773)	(6,627)
Loss on real estate venture formation	950	0
Loss on early extinguishment of debt	1,549	580
Historic tax credit transaction income	(11,840)	(12,026)
Changes in assets and liabilities:
Accounts receivable	1,580	2,130
Other assets	(7,200)	(5,000)
Accounts payable and accrued expenses	9,565	21,382
Deferred income, gains and rent	(4,681)	(4,376)
Deferred financing obligation	(1,314)	0
Other liabilities	(1,175)	5,284
Net cash from operating activities	122,145	155,993
Cash flows from investing activities:
Acquisition of properties	(9,226)	(40,674)
Investments in Available-for-sale Securities, Debt	(98,250)	0
Proceeds from the sale of available-for-sale securities	98,250	0
Sales of properties, net	170,918	5,639
Proceeds from repayment of mortgage notes receivable	23,930	0
Capital expenditures	(73,649)	(97,557)
Advances for purchase of tenant assets, net of repayments	(13)	(1,552)
Loan provided to unconsolidated Real Estate Venture partner	0	(1,045)
Investment in unconsolidated Real Estate Ventures	(49,763)	(2,259)
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	2,779	3,432
Leasing costs	(22,111)	(28,460)
Net cash from (used in) investing activities	42,865	(162,476)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	407,502
Repayments of Credit Facility	(297,000)	(424,502)
Repayments of mortgage notes payable	(9,209)	(218,959)
Proceeds from unsecured notes		321,498
Deferred financing obligation non-cash interest expense	701	0
Net Proceeds from Issuance of Common Stock	0	7,966
Net Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Redemption of preferred units	(50,188)	0
Repayments from unsecured notes	(167,841)	(25,366)
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,462)	(4,199)
Exercise of stock options	748	659
Distributions paid to shareholders/unitholders	(72,719)	(68,362)
Net cash from (used in) financing activities	76,196	(4,376)
Increase (decrease) in cash and cash equivalents	241,206	(10,859)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	241,616	5,706
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2012 and 2011 of $1,978 and $1,450, respectively	83,618	78,091
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(1,270)	(2,114)
Change in capital expenditures financed through retention payable at period end	284	(5,863)
Change in unfunded tenant allowance	(1,411)	(442)
Distributions payable	$ 24,820	$ 23,505

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Deferred Costs (Tables)

9 Months Ended

Sep. 30, 2012

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

Deferred Costs

	September 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	145,212	$	(56,536	)	$	88,676
Financing Costs	40,828		(10,322		)	30,506
Total	$	186,040	$	(66,858	)	$	119,182

	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)

9 Months Ended

Sep. 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	(165,159	)	$	4.53	—	—
Canceled	(31,829	)	$	14.33
Outstanding at September 30, 2012	3,402,684		$	14.64	6.20	$	(9,559,637	)
Vested/Exercisable at September 30, 2012	2,735,766		$	15.80	6.09	$	(9,857,702	)

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	(10,238	)	11.49
Non-vested at September 30, 2012	631,854		$	12.61

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Deferred Costs (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Components of Deferred Costs Net [Abstract]
Leasing Costs, Total Cost	$ 145,212	$ 140,772
Financing Costs, Total Cost	40,828	38,929
Total Cost	186,040	179,701
Leasing Costs, Accumulated Amortization	(56,536)	(50,990)
Financing Costs, Accumulated Amortization	(10,322)	(13,349)
Total, Accumulated Amortization	(66,858)	(64,339)
Leasing Costs, Deferred Costs, net	88,676	89,782
Financing Costs, Deferred Costs, net	30,506	25,580
Deferred Costs	$ 119,182	$ 115,362

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Share Based and Deferred Compensation (Restricted Share Activity) (Details) (Restricted Share Awards [Member], USD $)	9 Months Ended
	Sep. 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	(10,238)
Forfeited, Weighted Average Grant Date Fair Value	$ 11.49
Non-vested at June 30, 2012, shares	631,854
Non-vested at June 30, 2012, Weighted Average Grant Date Fair value	$ 12.61

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Real estate investments:
Rental properties	$ 4,660,289	$ 4,793,080
Accumulated depreciation	(925,342)	(865,710)
Operating real estate investments, net	3,734,947	3,927,370
Construction-in-progress	43,449	25,083
Land inventory	95,500	109,008
Total real estate investments, net	3,873,896	4,061,461
Cash and cash equivalents	241,616	410
Accounts receivable, net	13,394	14,718
Accrued rent receivable, net	117,306	108,101
Investment in real estate ventures, at equity	179,037	115,807
Deferred costs, net	119,182	115,362
Intangible Assets, net	52,575	70,515
Notes receivable	7,226	18,186
Other assets	62,494	53,158
Total assets	4,666,726	4,557,718
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	502,123	511,061
Unsecured credit facility	0	275,500
Unsecured term loans	600,000	37,500
Unsecured senior notes, net of discounts	1,404,466	1,569,934
Accounts payable and accrued expenses	80,554	69,929
Distributions payable	24,820	23,895
Deferred income, gains and rent	80,748	99,569
Acquired lease intangibles, net	29,824	35,106
Other liabilities	59,982	45,528
Total liabilities	2,782,517	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; 143,438,501 and 142,690,755 issued and outstanding in 2012 and 2011, respectively	1,432	1,424
Additional paid-in capital	2,828,722	2,776,197
Deferred compensation payable in common shares	5,352	5,631
Common shares in grantor trust, 290,745 in 2012 and 292,646 in 2011	(5,352)	(5,631)
Cumulative earnings	510,093	477,338
Accumulated other comprehensive loss	(20,456)	(6,079)
Cumulative distributions	(1,467,058)	(1,392,332)
Total Brandywine Realty Trust's equity	1,852,796	1,856,591
Non-controlling interests	31,413	33,105
Total equity	1,884,209	1,889,696
Total liabilities and equity	4,666,726	4,557,718
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Rental properties	4,660,289	4,793,080
Accumulated depreciation	(925,342)	(865,710)
Operating real estate investments, net	3,734,947	3,927,370
Construction-in-progress	43,449	25,083
Land inventory	95,500	109,008
Total real estate investments, net	3,873,896	4,061,461
Cash and cash equivalents	241,616	410
Accounts receivable, net	13,394	14,718
Accrued rent receivable, net	117,306	108,101
Investment in real estate ventures, at equity	179,037	115,807
Deferred costs, net	119,182	115,362
Intangible Assets, net	52,575	70,515
Notes receivable	7,226	18,186
Other assets	62,494	53,158
Total assets	4,666,726	4,557,718
LIABILITIES AND BENEFICIARIES' EQUITY
Mortgage notes payable	502,123	511,061
Unsecured credit facility	0	275,500
Unsecured term loans	600,000	37,500
Unsecured senior notes, net of discounts	1,404,466	1,569,934
Accounts payable and accrued expenses	80,554	69,929
Distributions payable	24,820	23,895
Deferred income, gains and rent	80,748	99,569
Acquired lease intangibles, net	29,824	35,106
Other liabilities	59,982	45,528
Total liabilities	2,782,517	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	40,509	38,370
Brandywine Realty Trust's equity:
General Partnership Capital, 143,438,501 and 142,690,755 units issued and outstanding in 2012 and 2011, respectively	1,711,926	1,754,302
Accumulated other comprehensive loss	(20,614)	(6,426)
Total Brandywine Realty Trust's equity	1,843,700	1,851,326
Total liabilities and equity	4,666,726	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	$ 0

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Summary of Significant Accounting Policies (Fair Value Measurements) (Details) (Interest Rate Swap [Member], Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Liabilities:
Interest Rate Swaps	$ 18,741	$ 3,886
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Liabilities:
Interest Rate Swaps	0	0
Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Interest Rate Swaps	18,741	3,886
Unobservable Inputs (Level 3) [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)	(113)									(259)			146
Comprehensive income (loss)	(487)										(479)		(8)
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	338								(308)				30
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	6	(6)		(6)
Bonus Share Issuance, shares						(463)	463
Vesting of Restricted Shares	(352)				1	3,062			(1,818)	(1,597)
Vesting of Restricted Shares, shares					85,248	(116,216)	9,043
Restricted Share Amortization	2,228								2,228
Restricted Performance Units Amortization	1,229								1,229
Exercise of Stock Options	659				1				658
Exercise of Stock Options, shares					120,179
Share Option Amortization	1,105								1,105
Outperformance Plan Amortization	128								128
Outperformance Plan Amortization, shares
Share Issuance from/to Deferred Compensation Plan	(16)						(149)	149	(16)
Share Issuance from/to Deferred Compensation Plan, shares					(845)		(8,141)
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								3,037				(3,037)
Preferred Share distributions	(5,994)											(5,994)
Preferred share redemption charge	0
Distributions declared ($0.45), and ($0.45) per share in September 30, 2012 and September 30, 2011, respectively	(63,184)											(61,294)	(1,890)
Ending Balance at Sep. 30, 2011	1,920,894	43			1,353	0	5,631	(5,631)	2,686,800	481,577	(2,424)	(1,368,809)	122,354
Ending Balance, shares at Sep. 30, 2011		4,300,000			135,579,643	0	292,646
Beginning Balance at Dec. 31, 2011		43				0				477,338			33,105
Beginning Balance, shares at Dec. 31, 2011		4,300,000				0
Net income (loss)										32,804			423
Ending Balance at Jun. 30, 2012
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)	33,227
Comprehensive income (loss)	(14,580)										(14,377)		(203)
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	(231)				1				149	(49)			(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	(1,291)				3				(1,294)
Vesting of Restricted Shares, shares					280,851		9,036
Restricted Share Amortization	2,138								2,138
Vesting of Restricted Performance Units	(1,329)				2				(1,331)
Vesting of Restricted Performance Units, shares					249,797
Restricted Performance Units Amortization	1,926								1,926
Exercise of Stock Options	748				2				746
Exercise of Stock Options, shares	165,159				165,159
Share Option Amortization	1,121								1,121
Share Issuance from/to Deferred Compensation Plan	0						(279)	279
Share Issuance from/to Deferred Compensation Plan, shares					(5,564)		10,937
Stock Issued During Period, Value, Other	15								15
Stock Issued During Period, Shares, Other					1,336
Adjustment to Non-controlling Interest	11								358				(347)
Preferred Share distributions	(7,832)											(7,832)
Preferred share redemption charge	(2,090)											(2,090)
Distributions declared ($0.45), and ($0.45) per share in September 30, 2012 and September 30, 2011, respectively	(66,037)											(64,804)	(1,233)
Ending Balance at Sep. 30, 2012	1,884,209	63			1,432	0	5,352	(5,352)	2,828,722	510,093	(20,456)	(1,467,058)	31,413
Ending Balance, shares at Sep. 30, 2012		6,300,000			143,438,501	0	290,745
Beginning Balance at Jun. 30, 2012
Net income (loss)	17,089
Comprehensive income (loss)	(4,081)
Preferred Stock, Shares Issued		2,300,000		4,000,000
Preferred Stock, Value, Issued	96,850	23		40
Preferred share redemption charge	0
Ending Balance at Sep. 30, 2012	$ 1,884,209	$ 63				$ 0
Ending Balance, shares at Sep. 30, 2012		6,300,000				0

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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	Sep. 30, 2012	Dec. 31, 2011
Summary of debt repurchases
2012	$ 3,262
2013	66,924
2014	250,612
2015	466,853
2016	596,608
Thereafter	1,127,730
Total principal payments	2,511,989
Net unamortized premiums/(discounts)	(5,400)
Total Debt Obligations	$ 2,506,589	$ 2,393,995

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Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

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

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable	$	503,181	$	548,413	$	512,391		$	545,784
Unsecured notes payable	$	1,330,198	$	1,458,187	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	9,790	$	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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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011 Properties	Sep. 30, 2012 Discontinued Operations [Member]	Sep. 30, 2011 Discontinued Operations [Member]	Sep. 30, 2012 Discontinued Operations [Member] Properties	Sep. 30, 2011 Discontinued Operations [Member]	Sep. 30, 2012 Discontinued Operations [Member] Properties
Revenue:
Rents	$ 113,989	$ 116,251	$ 343,260	$ 346,579		$ 271	$ 5,450	$ 6,384	$ 16,742
Tenant Reimbursements	20,695	19,010	58,308	59,187		(16)	797	742	2,728
Gain (Loss) on Contract Termination	931	157	2,522	2,673		4	33	11	33
Other	1,761	955	4,259	3,314		(1)	(2)	88	0
Total revenue	140,383	139,401	417,370	420,267		258	6,278	7,225	19,503
Expenses:
Property operating expenses	40,705	40,788	118,068	124,023		154	1,573	1,855	5,212
Real estate taxes	14,064	13,204	42,292	40,699		29	659	755	2,105
Depreciation and amortization	48,738	51,943	147,618	157,157		6	2,296	2,750	6,857
Total operating expenses	110,885	113,491	329,999	344,585		189	4,528	5,360	14,174
Investment Income, Interest	311	523	2,635	1,385		0		2
Income from discontinued operations before gain on sale of interests in real estate	69	1,750	1,867	5,329		69	1,750	1,867	5,329
Net gain on disposition of discontinued operations	9,940	0	34,774	3,836		9,940	0	34,774	3,836
Income from discontinued operations	$ 10,009	$ 1,750	$ 36,641	$ 9,165		$ 10,009	$ 1,750	$ 36,641	$ 9,165
Number of properties sold (in properties)					2			14		18

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Partners Equity of The Operating Partnership

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

PARTNERS' EQUITY OF THE OPERATING PARTNERSHIP

PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Amount allocable to unvested restricted unitholders	(95		)	(95		)	(121		)	(121		)
Preferred unit dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common unitholders	4,200			4,200			2,742			2,742
Discontinued operations attributable to common unitholders	10,009			10,009			1,750			1,750
Net income attributable to common unitholders	$	14,209		$	14,209		$	4,492		$	4,492
Denominator
Weighted-average units outstanding	146,082,206			146,082,206			145,372,247			145,372,247
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average units outstanding	146,082,206			146,785,731			145,372,247			146,651,211
Earnings per Common Partnership Unit:
Income from continuing operations attributable to common unitholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common unitholders	0.07			0.07			0.01			0.01
Net income attributable to common unitholders	$	0.10		$	0.10		$	0.03		$	0.03

	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Amount allocable to unvested restricted unitholders	(286		)	(286		)	(384		)	(384		)
Preferred unit dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred unit redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common unitholders	(13,622		)	(13,622		)	(15,656		)	(15,656		)
Discontinued operations attributable to common unitholders	36,641			36,641			9,165			9,165
Net income (loss) attributable to common unitholders	$	23,019		$	23,019		$	(6,491	)	$	(6,491	)
Denominator
Weighted-average units outstanding	145,842,872			145,842,872			145,027,663			145,027,663
Earnings per Common Partnership Unit:
Loss from continuing operations attributable to common unitholders	$	(0.09	)	$	(0.09	)	$	(0.11	)	$	(0.11	)
Discontinued operations attributable to common unitholders	0.25			0.25			0.06			0.06
Net income (loss) attributable to common unitholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

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 nine-months ended September 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. 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 prior year.

On September 11, 2012, the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $21.6 million, which was paid on October 19, 2012 to unitholders of record as of October 5, 2012.

On September 11, 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 September 30, 2012. These units are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares related to the Offering Program, and accordingly, during the nine-month period ended September 30, 2012, the Operating Partnership did not issue any common partnership units in connection with the Parent Company's 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 nine-month period ended September 30, 2012 and accordingly, during the nine-month period ended September 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)

9 Months Ended

Sep. 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
				9/30/2012		12/31/2011						9/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	9,523	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	2,385		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	509		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	271		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	993		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,408		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	1,095		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	1,327		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	1,230		—
				$	578,610	$	452,836					$	18,741	$	3,886

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Tax Credit Transactions

9 Months Ended

Sep. 30, 2011

Income Tax Disclosure [Abstract]

TAX CREDIT TRANSACTIONS

TAX CREDIT TRANSACTIONS

Historic Tax Credit Transaction

On November 17, 2008, the Company closed a transaction with US Bancorp (“USB”) related to the historic rehabilitation of the IRS Philadelphia Campus, a 862,692 square foot office building that is 100% leased to the IRS. On August 27, 2010, the Company completed the development of the IRS Philadelphia Campus and the IRS lease commenced. 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 $39.1 million and $51.6 million as of September 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 September 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. For the nine months ended September 30, 2012, the Company recognized $11.8 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. 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 September 30, 2012 and December 31, 2011 is $1.6 million and $2.1 million, respectively 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 $1.0 million for the three and nine-month periods ended September 30, 2012, respectively, and $0.3 million and $1.0 million for the three and nine-month periods ended September 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 September 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 September 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 (DetailsTextuals) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended				0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended			9 Months Ended		0 Months Ended	9 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended			0 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	May 02, 2006	May 03, 2012 7.50% Series C Preferred Shares	Sep. 30, 2012 7.50% Series C Preferred Shares	Oct. 16, 2012 7.375% Series D Preferred Shares	Sep. 30, 2012 7.375% Series D Preferred Shares	Oct. 19, 2012 7.375% Series D Preferred Shares Dividend Paid	Oct. 05, 2012 7.375% Series D Preferred Shares Dividend Paid	Sep. 30, 2012 Offering Program [Member]	Sep. 30, 2011 Offering Program [Member]	Oct. 16, 2012 6.90% Series E Preferred Stock [Member]	Sep. 30, 2012 6.90% Series E Preferred Stock [Member]	Apr. 11, 2012 6.90% Series E Preferred Stock [Member]	Sep. 30, 2012 6.90% Series E Preferred Stock [Member]	Sep. 30, 2012 Subsidiaries [Member]	Sep. 30, 2011 Subsidiaries [Member]	Sep. 30, 2012 Subsidiaries [Member]	Sep. 30, 2011 Subsidiaries [Member]	Dec. 31, 2011 Subsidiaries [Member]	Oct. 19, 2012 Subsidiaries [Member]	Oct. 05, 2012 Subsidiaries [Member]	May 03, 2012 Subsidiaries [Member] 7.50% Series C Preferred Shares	Sep. 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)				$ 50,000
Net Proceeds from Issuance of Preferred Stock and Preference Stock			96,240	0												96,300					96,240	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			7,832	5,994				200	1,100						1,800
Redemption Premium	0	0	2,090	0															0	0	2,090	0				(2,100)
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													$ 12.50	$ 12.18
Issuance of Common Shares of Beneficial Interest				8,272										8,000
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	$ 24,820	$ 23,505	$ 24,820	$ 23,505	$ 23,895							$ 21,600							$ 24,820	$ 23,505	$ 24,820	$ 23,505	$ 23,895		$ 21,600

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Consolidated Statements of Beneficiaries' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cumulative Distributions
Distributions declared, per share	$ 0.45	$ 0.45
Non-Controlling Interests
Distributions declared, per share	$ 0.45	$ 0.45

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 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	143,438,501	142,690,755
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding	143,438,501	142,690,755
Common shares in grantor trust	290,745	292,646
BRANDYWINE OPERATING PARTNERSHIP, L.P.
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	143,438,501	142,690,755
General Partners' Capital account, units outstanding	143,438,501	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

9 Months Ended

Sep. 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 September 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 September 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):

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount			Fair Value
Mortgage notes payable	$	503,181	$	548,413	$	512,391		$	545,784
Unsecured notes payable	$	1,330,198	$	1,458,187	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610	$	676,693	$	391,610		$	380,786
Notes receivable	$	7,226	$	9,790	$	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 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 September 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 September 30, 2012 was 3.222%. 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 September 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 September 30, 2012, and current estimates of fair value may differ from the amounts presented herein.

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Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Oct. 26, 2012
Entity Registrant Name	BRANDYWINE REALTY TRUST
Entity Central Index Key	0000790816
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
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		143,443,501
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	Sep. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer

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Risk Management and Use of Financial Instruments

9 Months Ended

Sep. 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 its unsecured public debt securities (Note 7) contain restrictions, requirements and other limitations on the ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt which it must maintain. The ability to borrow under the 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 any borrowings under the New Credit Facility would become unavailable. If the Company is unable to obtain a waiver, this would have a material adverse effect on the Company’s financial position and results of operations.

The Company was in compliance with all financial covenants as of September 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 September 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
				9/30/2012		12/31/2011						9/30/2012		12/31/2011
Swap	Interest Rate	Cash Flow	(a)	$	200,000	$	200,000	3.623	%	December 6-13, 2011	February 1, 2019	$	9,523	$	2,820
Swap	Interest Rate	Cash Flow	(a)	127,000		127,000		2.702	%	December 9-13, 2011	February 1, 2016	2,385		340
Swap	Interest Rate	Cash Flow	(a)	50,000		50,000		2.470	%	December 13, 2011	February 1, 2015	509		65
Swap	Interest Rate	Cash Flow	(a)	23,000		23,000		2.513	%	December 7-12, 2012	May 1, 2015	271		27
Swap	Interest Rate	Cash Flow	(a)	27,062		27,062		2.750	%	December 21, 2011	September 30, 2017	993		244
Swap	Interest Rate	Cash Flow	(a)	25,774		25,774		3.300	%	December 22, 2011	January 30, 2021	1,408		390
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.780	%	January 6, 2012	August 1, 2016	1,095		—
Swap	Interest Rate	Cash Flow	(a)	50,000		—		2.910	%	January 6, 2012	February 1, 2017	1,327		—
Swap	Interest Rate	Cash Flow	(a)	25,774		—		3.090	%	January 6, 2012	October 30, 2019	1,230		—
				$	578,610	$	452,836					$	18,741	$	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 nine-month periods ended September 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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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Rents	$ 113,989	$ 116,251	$ 343,260	$ 346,579
Tenant reimbursements	20,695	19,010	58,308	59,187
Termination fees	931	157	2,522	2,673
Third party management fees, labor reimbursement and leasing	3,007	3,028	9,021	8,514
Other	1,761	955	4,259	3,314
Total revenue	140,383	139,401	417,370	420,267
Operating Expenses:
Property operating expenses	40,705	40,788	118,068	124,023
Real estate taxes	14,064	13,204	42,292	40,699
Third party management expenses	1,298	1,379	3,812	4,395
Depreciation and amortization	48,738	51,943	147,618	157,157
General and administrative expenses	6,080	6,177	18,209	18,311
Total operating expenses	110,885	113,491	329,999	344,585
Operating income	29,498	25,910	87,371	75,682
Other Income (Expense):
Investment Income, Interest	311	523	2,635	1,385
Historic tax credit transaction income	11,840	12,026	11,840	12,026
Interest expense	(32,620)	(32,346)	(99,745)	(99,477)
Interest expense - amortization of deferred financing costs	(1,218)	(1,846)	(3,790)	(3,844)
Interest expense — financing obligation	(230)	0	(608)	0
Equity in income of real estate ventures	500	418	1,382	2,739
Net gain on sale of interests in real estate	0	0	0	2,791
Loss on real estate venture formation	(950)	0	(950)	0
Gain (loss) on early extinguishment of debt	(51)	176	(1,549)	(580)
Income (loss) from continuing operations	7,080	4,861	(3,414)	(9,278)
Discontinued operations:
Income from discontinued operations	69	1,750	1,867	5,329
Net gain (loss) on disposition of discontinued operations	9,940	0	34,774	3,836
Total discontinued operations	10,009	1,750	36,641	9,165
Net income (loss)	17,089	6,611	33,227	(113)
Net income from discontinued operations attributable to non-controlling interests - LP units	(182)	(86)	(669)	(234)
Net (income) loss attributable to non-controlling interests - LP units	(78)	(276)	244	88
Net (income) loss attributable to non-controlling interests	(260)	(362)	(425)	(146)
Net income (loss) attributable to Brandywine Realty Trust	16,829	6,249	32,802	(259)
Distribution to Preferred Shares	(2,785)	(1,998)	(7,832)	(5,994)
Preferred share redemption charge	0	0	(2,090)	0
Amount allocated to unvested restricted shareholders	(95)	(121)	(286)	(384)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	13,949	4,130	22,594	(6,637)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Basic income (loss) per Common Share (in dollars per share)	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Diluted income (loss) per Common Share (in dollars per share)	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Basic weighted average shares outstanding (in shares)	143,424,485	135,562,487	143,182,911	135,164,424
Diluted weighted average shares outstanding (in shares)	144,128,010	136,841,451	143,182,911	135,164,424
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	7,002	4,585	(3,170)	(9,190)
Income (loss) from discontinued operations	9,827	1,664	35,972	8,931
Net income (loss)	16,829	6,249	32,802	(259)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue:
Rents	113,989	116,251	343,260	346,579
Tenant reimbursements	20,695	19,010	58,308	59,187
Termination fees	931	157	2,522	2,673
Third party management fees, labor reimbursement and leasing	3,007	3,028	9,021	8,514
Other	1,761	955	4,259	3,314
Total revenue	140,383	139,401	417,370	420,267
Operating Expenses:
Property operating expenses	40,705	40,788	118,068	124,023
Real estate taxes	14,064	13,204	42,292	40,699
Third party management expenses	1,298	1,379	3,812	4,395
Depreciation and amortization	48,738	51,943	147,618	157,157
General and administrative expenses	6,080	6,177	18,209	18,311
Total operating expenses	110,885	113,491	329,999	344,585
Operating income	29,498	25,910	87,371	75,682
Other Income (Expense):
Investment Income, Interest	311	523	2,635	1,385
Historic tax credit transaction income	11,840	12,026	11,840	12,026
Interest expense	(32,620)	(32,346)	(99,745)	(99,477)
Interest expense - amortization of deferred financing costs	(1,218)	(1,846)	(3,790)	(3,844)
Interest expense — financing obligation	(230)	0	(608)	0
Equity in income of real estate ventures	500	418	1,382	2,739
Net gain on sale of interests in real estate	0	0	0	2,791
Loss on real estate venture formation	(950)	0	(950)	0
Gain (loss) on early extinguishment of debt	(51)	176	(1,549)	(580)
Income (loss) from continuing operations	7,080	4,861	(3,414)	(9,278)
Discontinued operations:
Income from discontinued operations	69	1,750	1,867	5,329
Net gain (loss) on disposition of discontinued operations	9,940	0	34,774	3,836
Total discontinued operations	10,009	1,750	36,641	9,165
Net income (loss)	17,089	6,611	33,227	(113)
Net income (loss) attributable to Brandywine Realty Trust	17,089	6,611	33,227	(113)
Distribution to Preferred Shares	(2,785)	(1,998)	(7,832)	(5,994)
Preferred share redemption charge	0	0	(2,090)	0
Amount allocated to unvested restricted shareholders	(95)	(121)	(286)	(384)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	14,209	4,492	23,019	(6,491)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ 0.03	$ 0.02	$ (0.09)	$ (0.11)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.01	$ 0.25	$ 0.06
Basic income (loss) per Common Share (in dollars per share)	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ 0.03	$ 0.02	$ (0.09)	$ (0.11)
Discontinued operations (in dollars per share)	$ 0.07	$ 0.01	$ 0.25	$ 0.06
Diluted income (loss) per Common Share (in dollars per share)	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Basic weighted average shares outstanding (in shares)	146,082,206	145,372,247	145,842,872	145,027,663
Diluted weighted average shares outstanding (in shares)	146,785,731	146,651,211	145,842,872	145,027,663
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	7,080	4,861	(3,414)	(9,278)
Income (loss) from discontinued operations	10,009	1,750	36,641	9,165
Net income (loss)	$ 17,089	$ 6,611	$ 33,227	$ (113)

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Real Estate Investments

9 Months Ended

Sep. 30, 2012

Real Estate [Abstract]

REAL ESTATE INVESTMENTS

REAL ESTATE INVESTMENTS

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

	September 30, 2012		December 31, 2011
Land	$	649,689	$	677,891
Building and improvements	3,530,214		3,631,388
Tenant improvements	480,386		483,801
	$	4,660,289	$	4,793,080

Brandywine/Toll Brothers Venture

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

Based on the facts and circumstances at Venture formation, the Company has determined that the Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the voting interest model under the accounting standard for consolidation to determine if it will consolidate the Venture. Based on the provisions within the joint venture agreement, the Company and Toll Brothers have significant participating rights and the Company does not have exclusive control over the development or construction phases of the project. Since each partner has significant participating rights, the land parcel contributed to the Venture was deconsolidated by the Company and is accounted for under the equity method of accounting. As of September 30, 2012, the carrying amount of the Company's equity investment in this Venture amounted to $15.2 million, with an associated $0.3 million permanent basis adjustment accounting for the difference between the fair value and carrying amount of the said land parcel. This basis adjustment will remain unamortized until the property is sold to a third party or the Venture is dissolved, in accordance with the accounting standard for equity method investments.

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 recognized $0.1 million of acquisition related costs that have been capitalized on our consolidated balance sheet, in accordance with guidance on asset acquisitions.

Dispositions

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, were 81.6% occupied as of the date of sale.

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

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 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 September 30, 2012, the results of its operations for the three and nine-month periods ended September 30, 2012 and 2011 and its cash flows for the nine-month periods ended September 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 $0.6 million at September 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 nine-month periods ended September 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 $9.0 million as of September 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 Company is currently in negotiations to extend the development agreements related to these land parcels to December 31, 2015, and believes that an extension of these agreements is probable.

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 fair value of the investment, as estimated by management. The determination as to whether an impairment exists requires significant management judgment about the fair value of its ownership interest. Fair value is determined through various valuation techniques, including but not limited to, discounted cash flow models, quoted market values and third party appraisals.

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 $4.3 million and $16.0 million for the three and nine-month periods ended September 30, 2012, and approximately $4.9 million and $13.2 million for the three and nine-month periods ended September 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 $1.8 million for the three and nine-month periods ended September 30, 2012, and by $0.6 million and $1.7 million for the three and nine-month periods ended September 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 $0.6 million for the three and nine-month periods ended September 30, 2012, and by $0.4 million and $1.0 million for the three and nine-month periods ended September 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 September 30, 2012, 5,290,717 common shares remained available for future awards under the 1997 Plan (including 4,030,218 shares available solely for options and share appreciation rights). Through September 30, 2012, all options awarded under the 1997 Plan had a one to ten-year term.

The Company incurred stock-based compensation expense of $1.8 million and $5.5 million during the three and nine-month periods ended September 30, 2012, of which $0.5 million and $1.4 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 $4.8 million during the three and nine-month periods ended September 30, 2011, of which $0.4 million and $1.1 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 derivatives and available-for-sale securities 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 September 30, 2012 (in thousands):

	Fair Value Measurements at Reporting Date Using:
	September 30,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Recurring
Liabilities:
Interest Rate Swaps	$	18,741	$	—	$	18,741	$	—

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 nine months ended September 30, 2012.

Available-for-sale securities

During the third quarter of 2012, the Company sold its entire remaining portfolio of available-for-sale securities, totaling $42.1 million, recognizing a $0.1 million loss associated with the sale. This transaction was completed after determining that a strategy of liquidation was in the Company's best interest.

The following table sets forth the details of the remaining available-for-sale securities sold during the third quarter of 2012 (in thousands):

	Available-for-sale Securities Sold
	Cash Received		Principal Amount		Gain (loss)
Available-for-sale securities	$	42,030	$	42,105	$	(75	)

The Company did not hold any available-for-sale securities as of September 30, 2012 or December 31, 2011.

Notes Receivable

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

During the second quarter of 2012, 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 2014. In December of 2011, 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 have 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 September 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 September 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

9 Months Ended

Sep. 30, 2012

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

SHARE BASED AND DEFERRED COMPENSATION

SHARE BASED AND DEFERRED COMPENSATION

Stock Options

At September 30, 2012, the Parent Company had 3,402,684 options outstanding under its shareholder approved equity incentive plan. There were 666,918 options unvested as of September 30, 2012 and $1.3 million of unrecognized compensation expense associated with these options to be recognized over a weighted average of 1.1 years. During the three and nine-month periods ended September 30, 2012 the Company recognized compensation expense related to unvested options of $0.4 million and $1.1 million, of which $0.1 million and a $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. During the three and nine-month periods ended September 30, 2011, the Company recognized compensation expense related to unvested options of $0.4 million and $1.1 million, of which $0.1 million and $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization.

Option activity as of September 30, 2012 and changes during the nine-months ended September 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	(165,159	)	$	4.53	—	—
Canceled	(31,829	)	$	14.33
Outstanding at September 30, 2012	3,402,684		$	14.64	6.20	$	(9,559,637	)
Vested/Exercisable at September 30, 2012	2,735,766		$	15.80	6.09	$	(9,857,702	)

Restricted Share Awards

As of September 30, 2012, 631,854 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 September 30, 2012 was approximately $4.0 million. That expense is expected to be recognized over a weighted average remaining vesting period of 2.2 years. The Company recognized compensation expense related to outstanding restricted shares of $0.8 million and $2.3 million during the three and nine-month periods ended September 30, 2012, of which $0.2 million and $0.5 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 $2.4 million during the three and nine-month periods ended September 30, 2011, of which $0.2 million and $0.5 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 nine-months ended September 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	(10,238	)	11.49
Non-vested at September 30, 2012	631,854		$	12.61

On March 1, 2012, the Compensation Committee of the Company’s Board of Trustees awarded 193,270 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 September 30, 2012, one 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 260,571, 122,119, and 118,751 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 September 30, 2012, one of the Company’s executives has met conditions to elect a qualifying retirement.

For the three and nine-month periods ended September 30, 2012, the Company recognized total compensation expense for the 2012, 2011, and 2010 awards of $0.7 million and $2.1 million, of which $0.2 million and $0.6 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization. For the three and nine-month periods ended September 30, 2011, the Company recognized total compensation expense for the 2011 and 2010 awards of $0.5 million and $1.2 million, of which $0.1 million and $0.3 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 nine-month periods ended September 30, 2012, employees made purchases under the ESPP of $0.1 million and $0.3 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and nine-month periods ended September 30, 2012. During the three and nine-month periods ended September 30, 2011, employees made purchases under the ESPP of $0.1 million and $0.3 million, respectively. The Company recognized a nominal amount and $0.1 million compensation expense related to the ESPP during the three and nine-month periods ended September 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 nine-month periods ended September 30, 2012 and September 30, 2011, the Company recorded a net increase in compensation costs of $0.5 million and a net decrease in compensation costs of $0.8 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 the nine-month periods ended September 30, 2012 and September 30, 2011, the Company recorded a net decrease in compensation costs of $0.5 million and a net increase in compensation costs of $0.8 million, respectively, 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 September 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

9 Months Ended

Sep. 30, 2012

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS

For the three and nine-month periods ended September 30, 2012, income from discontinued operations relates to the 14 properties that the Company sold during 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and nine-month periods ended September 30, 2012 (in thousands):

	Three-month period ended September 30, 2012			Nine-month period ended September 30, 2012
Revenue:
Rents	$	271		$	6,384
Tenant reimbursements	(16		)	742
Termination fees	4			11
Other	(1		)	88
Total revenue	258			7,225
Expenses:
Property operating expenses	154			1,855
Real estate taxes	29			755
Depreciation and amortization	6			2,750
Total operating expenses	189			5,360
Other income (expense):
Interest income	—			2
Income from discontinued operations before gain on sale of interests in real estate	69			1,867
Net gain on disposition of discontinued operations	9,940			34,774
Income from discontinued operations	$	10,009		$	36,641

For the three and nine-month periods ended September 30, 2011, income from discontinued operations relates to the 18 properties that the Company sold from January 1, 2011 through September 30, 2012. The following table summarizes the revenue and expense information for properties classified as discontinued operations for the three and nine-month periods ended September 30, 2011 (in thousands):

	Three-month period ended September 30, 2011			Nine-month period ended September 30, 2011
Revenue:
Rents	$	5,450		$	16,742
Tenant reimbursements	797			2,728
Termination fees	33			33
Other	(2		)	—
Total revenue	6,278			19,503
Expenses:
Property operating expenses	1,573			5,212
Real estate taxes	659			2,105
Depreciation and amortization	2,296			6,857
Total operating expenses	4,528			14,174
Income from discontinued operations before gain on sale of interests in real estate	1,750			5,329
Net gain on disposition of discontinued operations	—			3,836
Income from discontinued operations	$	1,750		$	9,165

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

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

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

	September 30, 2012
	Total Cost		Accumulated Amortization			Intangible Assets, net
In-place lease value	$	72,099	$	(45,704	)	$	26,395
Tenant relationship value	58,811		(38,716		)	20,095
Above market leases acquired	7,840		(1,755		)	6,085
Total	$	138,750	$	(86,175	)	$	52,575
Below market leases acquired	$	73,342	$	(43,518	)	$	29,824

	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 September 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 (three months remaining)	$	3,603	$	1,642
2013	12,076		6,284
2014	9,299		4,741
2015	6,909		2,597
2016	4,436		1,704
Thereafter	16,252		12,856
Total	$	52,575	$	29,824

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Debt Obligations (Details Textuals) (USD $)	9 Months Ended						9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Feb. 01, 2012 Unsecured Debt [Member]	Sep. 30, 2012 Letter of Credit [Member] Unsecured Debt [Member]	Sep. 30, 2012 New Revolving Credit Facility [Member] Unsecured Debt [Member]	Dec. 15, 2011 New Revolving Credit Facility [Member] Unsecured Debt [Member]	Sep. 30, 2012 Bank Term Loan and the Credit Facility [Member] Unsecured Debt [Member]	Sep. 30, 2012 $300.0M 5.750% Guaranteed Notes due 2012 [Member] Unsecured Debt [Member]	Sep. 30, 2012 $250.0M 5.400% Guaranteed Notes due 2014 [Member] Unsecured Debt [Member]	Sep. 30, 2012 $250.0M 7.500% Guaranteed Notes due 2015 [Member] Unsecured Debt [Member]	Sep. 30, 2012 $250.0M 6.000% Guaranteed Notes due 2016 [Member] Unsecured Debt [Member]	Sep. 30, 2012 $300.0M 5.700% Guaranteed Notes due 2017 [Member] Unsecured Debt [Member]	Sep. 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				2,800,000
Option for additional borrowings subject to customary conditions and limitations						200,000,000
Unused availability under the Credit Facility					$ 597,200,000

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Investment in Unconsolidated Ventures

9 Months Ended

Sep. 30, 2012

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED VENTURES

INVESTMENT IN UNCONSOLIDATED VENTURES

As of September 30, 2012, the Company had an aggregate investment of approximately $179.0 million in 19 unconsolidated Real Estate Ventures. The Company formed or acquired interests in these ventures with unaffiliated third parties to develop or manage office properties or to acquire land in anticipation of possible development of office or residential properties. As of September 30, 2012, 15 of the Real Estate Ventures owned 54 office buildings that contain an aggregate of approximately 7.0 million net rentable square feet; three Real Estate Ventures owned 24 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 September 30, 2012 and December 31, 2011 (in thousands):

	September 30, 2012		December 31, 2011
Net property	$	925,227	$	846,643
Other assets	180,957		110,520
Other liabilities	55,592		48,798
Debt	740,885		745,830
Equity	309,707		162,535
Company’s share of equity (Company’s basis)	179,037		115,807

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

	Three-month periods ended September 30,				Nine-month periods ended September 30,
	2012		2011		2012		2011
Revenue	$	42,772	$	36,345	$	120,644	$	108,743
Operating expenses	18,753		15,863		51,819		46,407
Interest expense, net	10,233		10,326		31,100		31,999
Depreciation and amortization	12,947		9,869		36,067		28,836
Net income (loss)	839		287		1,658		1,501
Company’s share of income (Company’s basis)	500		418		1,382		2,739

As of September 30, 2012, the Company had guaranteed repayment of approximately $0.6 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.

On September 19, 2012, the Company settled and was released from a previous agreement with a third party service provider ("the provider") who provided services related to Brandywine AI Ventures ("the venture"). The agreement between the two parties required that the Company pay the provider certain commissions and fees related to real estate acquisitions to be executed by the venture in the future. The Company paid a one-time termination fee of approximately $1.0 million to the provider in order to terminate and discharge any future obligations of commissions and fees associated with acquisitions by the venture. This fee is shown within the Company's consolidated statements of operations as "Loss on real estate venture formation" as the fee is associated with a contract entered into at the time of the formation of the venture. There were no comparable charges for the prior period.

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Deferred Costs

9 Months Ended

Sep. 30, 2012

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

DEFERRED COSTS

DEFERRED COSTS

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

	September 30, 2012
	Total Cost		Accumulated Amortization			Deferred Costs, net
Leasing Costs	$	145,212	$	(56,536	)	$	88,676
Financing Costs	40,828		(10,322		)	30,506
Total	$	186,040	$	(66,858	)	$	119,182

	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 nine-month periods ended September 30, 2012, the Company capitalized internal direct leasing costs of $1.3 million and $4.0 million, respectively, and $1.4 million and $4.7 million during the three and nine-month periods ended September 30, 2011, respectively, in accordance with the accounting standard for the capitalization of leasing costs.

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Debt Obligations

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

DEBT OBLIGATIONS

DEBT OBLIGATIONS

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

MORTGAGE DEBT:

Property / Location	September 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,289		$	56,538		7.25	%		May-13
Southpoint III	1,317			1,887			7.75	%		Apr-14
Tysons Corner	93,625			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,524			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	198,592			202,905			7.00	%		Sep-30
Cira South Garage	42,834			44,379			7.12	%		Sep-30
Principal balance outstanding	503,181			512,391
Plus: fair market value premiums (discounts), net	(1,058		)	(1,330		)
Total mortgage indebtedness	$	502,123		$	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 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	216,819			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	2,008,808			1,888,111
plus: original issue premium (discount), net	(4,342		)	(5,177		)
Total unsecured indebtedness	$	2,004,466		$	1,882,934
Total Debt Obligations	$	2,506,589		$	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 (the "New 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, and were repaid using a portion of the proceeds from the term loans.

During the nine-month periods ended September 30, 2012 and September 30, 2011, the Company’s weighted-average effective interest rate on its mortgage notes payable was 6.72% and 6.83%, respectively.

During the nine-months ended September 30, 2012, the Company repurchased $15.1 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		(263		)	8
2015 7.500% Notes	12,011		10,510		(1,284		)	10
	$	16,950	$	15,113	$	(1,549	)	$	18

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 September 30, 2012 is February 1, 2016. The per annum variable interest rate on any related outstanding balances, for which there were none at September 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 September 30, 2012, the Company had no related borrowings, with $2.8 million in letters of credit outstanding, leaving $597.2 million of unused availability under the New Credit Facility. During the nine-months ended September 30, 2011, the weighted-average interest rate on the Former Credit Facility borrowings was 0.98%. As of September 30, 2011, the weighted average interest rate on the Former Credit Facility was 0.95%. There were no comparable rates as of September 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, and 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 September 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 September 30, 2012.

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

2012	$	3,262
2013	66,924
2014	250,612
2015	466,853
2016	596,608
Thereafter	1,127,730
Total principal payments	2,511,989
Net unamortized premiums/(discounts)	(5,400		)
Outstanding indebtedness	$	2,506,589

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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Notional Amount	$ 578,610		$ 452,836
Fair value	18,741		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]
Derivative, Fixed Interest Rate	3.623%	[1]
Fair value	9,523	[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]
Derivative, Fixed Interest Rate	2.702%	[1]
Fair value	2,385	[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]
Derivative, Fixed Interest Rate	2.47%	[1]
Fair value	509	[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]
Derivative, Fixed Interest Rate	2.513%	[1]
Fair value	271	[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]
Derivative, Fixed Interest Rate	2.75%	[1]
Fair value	993	[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]
Derivative, Fixed Interest Rate	3.30%	[1]
Fair value	1,408	[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]
Derivative, Fixed Interest Rate	2.78%	[1]
Fair value	1,095	[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]
Derivative, Fixed Interest Rate	2.91%	[1]
Fair value	1,327	[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]
Derivative, Fixed Interest Rate	3.09%	[1]
Fair value	$ 1,230	[1]	$ 0	[1]

[1] Hedging unsecured variable rate debt.

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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	Sep. 30, 2012	Dec. 31, 2011
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 31.4	$ 33.1
Settlement value of non controlling interest in operating partnership	$ 32.4	$ 25.6

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Fair Value of Financial Instruments (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Properties	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average Fair Value Interest Rate on Debt		3.222%
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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Debt Obligations (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Consolidated debt obligations

Property / Location	September 30, 2012			December 31, 2011			Effective Interest Rate			Maturity Date
Newtown Square/Berwyn Park/Libertyview	$	55,289		$	56,538		7.25	%		May-13
Southpoint III	1,317			1,887			7.75	%		Apr-14
Tysons Corner	93,625			94,882			5.36	%	(a)	Aug-15
Two Logan Square	89,524			89,800			7.57	%		Apr-16
Fairview Eleven Tower	22,000			22,000			4.25	%		Jan-17
IRS Philadelphia Campus	198,592			202,905			7.00	%		Sep-30
Cira South Garage	42,834			44,379			7.12	%		Sep-30
Principal balance outstanding	503,181			512,391
Plus: fair market value premiums (discounts), net	(1,058		)	(1,330		)
Total mortgage indebtedness	$	502,123		$	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 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	216,819			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	2,008,808			1,888,111
plus: original issue premium (discount), net	(4,342		)	(5,177		)
Total unsecured indebtedness	$	2,004,466		$	1,882,934
Total Debt Obligations	$	2,506,589		$	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		(263		)	8
2015 7.500% Notes	12,011		10,510		(1,284		)	10
	$	16,950	$	15,113	$	(1,549	)	$	18

Schedule of principal payments of debt obligations

2012	$	3,262
2013	66,924
2014	250,612
2015	466,853
2016	596,608
Thereafter	1,127,730
Total principal payments	2,511,989
Net unamortized premiums/(discounts)	(5,400		)
Outstanding indebtedness	$	2,506,589

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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Loss on real estate venture formation	$ 950	$ 0	$ 950	$ 0
Financial position of the Real Estate Ventures
Company's share of equity (Company's basis)	179,037		179,037		115,807
Unconsolidated real estate ventures [Member]
Financial position of the Real Estate Ventures
Net property	925,227		925,227		846,643
Other Assets	180,957		180,957		110,520
Other Liabilities	55,592		55,592		48,798
Debt	740,885		740,885		745,830
Equity	309,707		309,707		162,535
Company's share of equity (Company's basis)	$ 179,037		$ 179,037		$ 115,807

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Beneficiaries Equity of the Parent Company

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

BENEFICIARIES' EQUITY OF THE PARENT COMPANY

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Net income from continuing operations attributable to non-controlling interests	(78		)	(78		)	(276		)	(276		)
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common shareholders	4,122			4,122			2,466			2,466
Income from discontinued operations	10,009			10,009			1,750			1,750
Discontinued operations attributable to non-controlling interests	(182		)	(182		)	(86		)	(86		)
Discontinued operations attributable to common shareholders	9,827			9,827			1,664			1,664
Net income attributable to common shareholders	$	13,949		$	13,949		$	4,130		$	4,130
Denominator
Weighted-average shares outstanding	143,424,485			143,424,485			135,562,487			135,562,487
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average shares outstanding	143,424,485			144,128,010			135,562,487			136,841,451
Earnings per Common Share:
Income from continuing operations attributable to common shareholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common shareholders	0.07			0.07			0.01			0.01
Net income attributable to common shareholders	$	0.10		$	0.10		$	0.03		$	0.03

	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Net loss from continuing operations attributable to non-controlling interests	244			244			88			88
Amount allocable to unvested restricted shareholders	(286		)	(286		)	(384		)	(384		)
Preferred share dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(13,378		)	(13,378		)	(15,568		)	(15,568		)
Income from discontinued operations	36,641			36,641			9,165			9,165
Discontinued operations attributable to non-controlling interests	(669		)	(669		)	(234		)	(234		)
Discontinued operations attributable to common shareholders	35,972			35,972			8,931			8,931
Net income (loss) attributable to common shareholders	$	22,594		$	22,594		$	(6,637	)	$	(6,637	)
Denominator
Weighted-average shares outstanding	143,182,911			143,182,911			135,164,424			135,164,424
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.09	)	$	(0.09	)	$	(0.12	)	$	(0.12	)
Discontinued operations attributable to common shareholders	0.25			0.25			0.07			0.07
Net income (loss) attributable to common shareholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

Redeemable common limited partnership units totaling 2,657,721 and 9,809,759 as of September 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 nine months ended September 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 on 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 related 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. 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 prior year.

On September 11, 2012, the Parent Company declared a distribution of $0.15 per common share, totaling $21.6 million, which was paid on October 19, 2012 to shareholders of record as of October 5, 2012. On September 11, 2012, the Parent Company declared distributions on its Series D Preferred Shares and Series E Preferred Shares to holders of record as of September 30, 2012. These shares are entitled to a preferential return of 7.375% and 6.90%, respectively. Distributions paid on October 15, 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 nine-month period ended September 30, 2012, the Parent Company did not sell any shares under the Offering Program. During the nine-month period ended September 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 September 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 nine-month period ended September 30, 2012. As of September 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

9 Months Ended

Sep. 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 September 30, 2012 are as follows (in thousands):

2012 (three months remaining)	$	455
2013	1,818
2014	1,818
2015	1,909
2016	1,909
Thereafter	288,754

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 September 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 September 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 (Acquisitions and Dispositions) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 A	Sep. 30, 2012 TB-BDN Plymouth Apartments [Member]	Sep. 05, 2012 TB-BDN Plymouth Apartments [Member] A	Jan. 06, 2012 Plymouth Meeting, Pennsylvania [Member] sqft	Jul. 18, 2012 Oaklands Corporate Center [Member]	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]
Equity Method Investment, Ownership Percentage			50.00%
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land	24		20
Other Ownership Interests, Contributed Capital			$ 15.5
Number of Units in Real Estate Property			398
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures		15.2
Permanent Basis Adjustment Between Carrying Value And Fair Value		0.3
Net rentable space of property acquired				154,392
Acquired real estate, cost of property				9.1
Acquisition related costs				0.1
Number of real estate properties sold					11
Net rentable square feet of properties sold					466,719	121,381	268,240	32,978
Sales price of properties sold					$ 52.7	$ 29.0	$ 91.1	$ 3.0
Lease percentage of sold property					81.60%	83.70%	100.00%	90.10%

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Segment Information (Tables)

9 Months Ended

Sep. 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 September 30, 2012:
Real estate investments, at cost:
Operating properties	$	1,174,597	$	962,235	$	1,189,014	$	545,104	$	308,371	$	259,304	$	221,664	$	—		$	4,660,289
Construction-in-progress															43,449			43,449
Land inventory															95,500			95,500
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 September 30, 2012:
Total revenue	$	38,526	$	33,025	$	26,516	$	20,553	$	8,826	$	8,275	$	5,141	$	(479	)	$	140,383
Property operating expenses, real estate taxes and third party management expenses	13,588		12,431		10,637		10,030		3,762		3,484		2,639		(504		)	56,067
Net operating income	$	24,938	$	20,594	$	15,879	$	10,523	$	5,064	$	4,791	$	2,502	$	25		$	84,316
For the three-months ended September 30, 2011:
Total revenue	$	36,812	$	31,097	$	29,296	$	20,743	$	9,334	$	7,453	$	4,968	$	(302	)	$	139,401
Property operating expenses, real estate taxes and third party management expenses	13,493		11,539		10,868		10,008		3,664		3,233		3,009		(443		)	55,371
Net operating income	$	23,319	$	19,558	$	18,428	$	10,735	$	5,670	$	4,220	$	1,959	$	141		$	84,030
For the nine-months ended September 30, 2012:
Total revenue	$	113,565	$	98,086	$	79,919	$	61,442	$	26,762	$	23,959	$	14,942	$	(1,305	)	$	417,370
Property operating expenses, real estate taxes and third party management expenses	39,643		37,082		31,158		28,697		10,875		10,497		7,498		(1,278		)	164,172
Net operating income	$	73,922	$	61,004	$	48,761	$	32,745	$	15,887	$	13,462	$	7,444	$	(27	)	$	253,198
For the nine-months ended September 30, 2011:
Total revenue	$	111,949	$	93,520	$	89,936	$	60,554	$	27,409	$	23,203	$	14,551	$	(855	)	$	420,267
Property operating expenses, real estate taxes and third party management expenses	42,112		34,962		34,002		30,611		10,666		9,740		8,015		(991		)	169,117
Net operating income	$	69,837	$	58,558	$	55,934	$	29,943	$	16,743	$	13,463	$	6,536	$	136		$	251,150

Reconciliation of consolidated net operating income

	Three-month periods ended September 30,						Nine-month periods ended September 30,
	2012			2011			2012			2011
	(amounts in thousands)						(amounts in thousands)
Consolidated net operating income	$	84,316		$	84,030		$	253,198		$	251,150
Less:
Interest expense	(32,620		)	(32,346		)	(99,745		)	(99,477		)
Deferred financing costs	(1,218		)	(1,846		)	(3,790		)	(3,844		)
Depreciation and amortization	(48,738		)	(51,943		)	(147,618		)	(157,157		)
Administrative expenses	(6,080		)	(6,177		)	(18,209		)	(18,311		)
Plus:
Interest income	311			523			2,635			1,385
Historic tax credit transaction income	11,840			12,026			11,840			12,026
Interest expense - financing obligation	(230		)	—			(608		)	—
Equity in income of real estate ventures	500			418			1,382			2,739
Net gain on sales of interests in real estate	—			—			—			2,791
Loss on real estate venture formation	(950		)	—			(950		)	—
Gain (loss) on early extinguishment of debt	(51		)	176			(1,549		)	(580		)
Income (loss) from continuing operations	7,080			4,861			(3,414		)	(9,278		)
Income from discontinued operations	10,009			1,750			36,641			9,165
Net income (loss)	$	17,089		$	6,611		$	33,227		$	(113	)

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 17,089	$ 6,611	$ 33,227	$ (113)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	(4,222)	0	(14,780)	(613)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76	53	200	126
Unrealized loss on available-for-sale securities	65	0	0	0
Total comprehensive income (loss)	(4,081)	53	(14,580)	(487)
Comprehensive income (loss)	13,008	6,664	18,647	(600)
Comprehensive (income) loss attributable to non-controlling interest	(186)	(365)	(158)	(139)
Comprehensive income (loss) attributable to Brandywine Realty Trust	12,822	6,299	18,489	(739)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)	17,089	6,611	33,227	(113)
Comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments	(4,222)	0	(14,780)	(613)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	76	53	200	126
Unrealized loss on available-for-sale securities	65	0	0	0
Total comprehensive income (loss)	(4,081)	53	(14,580)	(487)
Comprehensive income (loss) attributable to Brandywine Realty Trust	$ 13,008	$ 6,664	$ 18,647	$ (600)

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Organization of The Parent Company and The Operating Partnership

9 Months Ended

Sep. 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 September 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 September 30, 2012, the Company owned 219 properties, consisting of 194 office properties, 19 industrial facilities, five mixed-use properties and one development property (collectively, the “Properties”) containing an aggregate of approximately 24.5 million net rentable square feet. In addition, as of September 30, 2012, the Company owned economic interests in 19 unconsolidated real estate ventures that contain approximately 7.0 million net rentable square feet (collectively, the “Real Estate Ventures”). As of September 30, 2012, the Company also owned 424 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 September 30, 2012, the management company subsidiaries were managing properties containing an aggregate of approximately 31.9 million net rentable square feet, of which approximately 24.5 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 (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Schedule of principal payments of debt obligations
Repurchase Amount	$ 16,950
Principal	15,113
Loss	(1,549)
Deferred Financing Amortization	18
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	(263)
Deferred Financing Amortization	8
Debt instrument stated interest rate	5.40%
2015 7.500% Notes [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	12,011
Principal	10,510
Loss	(1,284)
Deferred Financing Amortization	$ 10
Debt instrument stated interest rate	7.50%

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Partners Equity of The Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator
Income (loss) from continuing operations, Basic	$ 7,080	$ 4,861	$ (3,414)	$ (9,278)
Income (loss) from continuing operations, Diluted	7,080	4,861	(3,414)	(9,278)
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(286)	(384)
Amount allocable to unvested restricted unitholders, Diluted	(95)	(121)	(286)	(384)
Preferred share/unit dividends, Basic	(2,785)	(1,998)	(7,832)	(5,994)
Preferred share/unit dividends, Diluted	(2,785)	(1,998)	(7,832)	(5,994)
Redemption Premium, Basic	0	0	(2,090)	0
Redemption Premium, Diluted			(2,090)	0
Discontinued operations attributable to common unitholders	10,009	1,750	36,641	9,165
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	13,949	4,130	22,594	(6,637)
Net income (loss) available to common shareholders/unitholders, Diluted	13,949	4,130	22,594	(6,637)
Denominator
Weighted-average units outstanding, Basic	143,424,485	135,562,487	143,182,911	135,164,424
Incremental Common Shares Attributable to Share-based Payment Arrangements	703,525	1,278,964
Weighted-average shares/units outstanding, Diluted	144,128,010	136,841,451	143,182,911	135,164,424
Income per Common Partnership Unit:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted	$ 0.03	$ 0.02	$ (0.09)	$ (0.12)
Discontinued operations attributable to common shareholders/unitholders, Basic	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Discontinued operations attributable to common shareholders, Diluted	$ 0.07	$ 0.01	$ 0.25	$ 0.07
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Income (Loss) From Discontinued Operations Diluted	10,009	1,750	36,641	9,165
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income (loss) from continuing operations, Basic	7,080	4,861	(3,414)	(9,278)
Income (loss) from continuing operations, Diluted	7,080	4,861	(3,414)	(9,278)
Amount allocated to unvested restricted shareholders/unitholders, Basic	(95)	(121)	(286)	(384)
Amount allocable to unvested restricted unitholders, Diluted	(95)	(121)	(286)	(384)
Preferred share/unit dividends, Basic	(2,785)	(1,998)	(7,832)	(5,994)
Preferred share/unit dividends, Diluted	(2,785)	(1,998)	(7,832)	(5,994)
Redemption Premium, Basic	0	0	(2,090)	0
Redemption Premium, Diluted			(2,090)	0
Income (loss) from continuing operations available to common unitholders, Basic	4,200	2,742	(13,622)	(15,656)
Income (loss) from continuing operations available to common unit holders, Diluted	4,200	2,742	(13,622)	(15,656)
Discontinued operations attributable to common unitholders	10,009	1,750	36,641	9,165
Discontinued operations attributable to common unitholders, Diluted	10,009	1,750	36,641	9,165
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	14,209	4,492	23,019	(6,491)
Net income (loss) available to common shareholders/unitholders, Diluted	$ 14,209	$ 4,492	$ 23,019	$ (6,491)
Denominator
Weighted-average units outstanding, Basic	146,082,206	145,372,247	145,842,872	145,027,663
Incremental Common Shares Attributable to Share-based Payment Arrangements	703,525	1,278,964
Weighted-average shares/units outstanding, Diluted	146,785,731	146,651,211	145,842,872	145,027,663
Income per Common Partnership Unit:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic	$ 0.03	$ 0.02	$ (0.09)	$ (0.11)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted	$ 0.03	$ 0.02	$ (0.09)	$ (0.11)
Discontinued operations attributable to common shareholders/unitholders, Basic	$ 0.07	$ 0.01	$ 0.25	$ 0.06
Discontinued operations attributable to common shareholders, Diluted	$ 0.07	$ 0.01	$ 0.25	$ 0.06
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.10	$ 0.03	$ 0.16	$ (0.05)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.10	$ 0.03	$ 0.16	$ (0.05)

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Subsequent Events

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

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

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Tax Credit Transactions (Details) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended	0 Months Ended	1 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Historic Tax Credit Transaction [Member]	Sep. 30, 2011 Historic Tax Credit Transaction [Member]	Sep. 30, 2012 Historic Tax Credit Transaction [Member]	Sep. 30, 2011 Historic Tax Credit Transaction [Member]	Dec. 31, 2011 Historic Tax Credit Transaction [Member]	Nov. 17, 2008 Historic Tax Credit Transaction [Member] sqft	Sep. 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]	Sep. 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]	Sep. 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					39,100,000	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					11,800,000		12,000,000
Allocated expenses within other income (expense)					500,000		500,000
Deferred transaction costs	119,182,000	115,362,000	1,600,000		1,600,000		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	1,000,000	1,000,000
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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Beneficiaries Equity of The Parent Company (Tables)

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

Earnings per Share (EPS)

BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Three-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	7,080		$	7,080		$	4,861		$	4,861
Net income from continuing operations attributable to non-controlling interests	(78		)	(78		)	(276		)	(276		)
Amount allocable to unvested restricted shareholders	(95		)	(95		)	(121		)	(121		)
Preferred share dividends	(2,785		)	(2,785		)	(1,998		)	(1,998		)
Income from continuing operations available to common shareholders	4,122			4,122			2,466			2,466
Income from discontinued operations	10,009			10,009			1,750			1,750
Discontinued operations attributable to non-controlling interests	(182		)	(182		)	(86		)	(86		)
Discontinued operations attributable to common shareholders	9,827			9,827			1,664			1,664
Net income attributable to common shareholders	$	13,949		$	13,949		$	4,130		$	4,130
Denominator
Weighted-average shares outstanding	143,424,485			143,424,485			135,562,487			135,562,487
Contingent securities/Share based compensation	—			703,525			—			1,278,964
Total weighted-average shares outstanding	143,424,485			144,128,010			135,562,487			136,841,451
Earnings per Common Share:
Income from continuing operations attributable to common shareholders	$	0.03		$	0.03		$	0.02		$	0.02
Discontinued operations attributable to common shareholders	0.07			0.07			0.01			0.01
Net income attributable to common shareholders	$	0.10		$	0.10		$	0.03		$	0.03

	Nine-month periods ended September 30,
	2012						2011
	Basic			Diluted			Basic			Diluted
Numerator
Loss from continuing operations	$	(3,414	)	$	(3,414	)	$	(9,278	)	$	(9,278	)
Net loss from continuing operations attributable to non-controlling interests	244			244			88			88
Amount allocable to unvested restricted shareholders	(286		)	(286		)	(384		)	(384		)
Preferred share dividends	(7,832		)	(7,832		)	(5,994		)	(5,994		)
Preferred share redemption charge	(2,090		)	(2,090		)	—			—
Loss from continuing operations available to common shareholders	(13,378		)	(13,378		)	(15,568		)	(15,568		)
Income from discontinued operations	36,641			36,641			9,165			9,165
Discontinued operations attributable to non-controlling interests	(669		)	(669		)	(234		)	(234		)
Discontinued operations attributable to common shareholders	35,972			35,972			8,931			8,931
Net income (loss) attributable to common shareholders	$	22,594		$	22,594		$	(6,637	)	$	(6,637	)
Denominator
Weighted-average shares outstanding	143,182,911			143,182,911			135,164,424			135,164,424
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders	$	(0.09	)	$	(0.09	)	$	(0.12	)	$	(0.12	)
Discontinued operations attributable to common shareholders	0.25			0.25			0.07			0.07
Net income (loss) attributable to common shareholders	$	0.16		$	0.16		$	(0.05	)	$	(0.05	)

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Non Controlling Interests in The Parent Company

9 Months Ended

Sep. 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 September 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 $31.4 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 $32.4 million and $25.6 million, respectively.