Exhibit 12.1

Brandywine Realty Trust
Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Share Distributions
(in thousands)

	Three-months ended March 31,						For the years ended December 31,
	2011			2010			2010			2009			2008			2007			2006
Earnings before fixed charges:
Add:
Income (loss) from continuing operations before non-controlling interest and equity in earnings from unconsolidated real estate ventures (a)	$	(1,616	)	$	(8,309	)	$	(34,943	)	$	1,270		$	(9,109	)	$	(110	)	$	(42,168	)
Distributed income of equity investees		403			182			657			1,557			7,639			6,900			2,150
Amortization of capitalized interest		949			1,383			3,527			3,166			2,801			2,170			1,508
Fixed charges — per below		34,039			36,071			148,007			151,723			170,083			184,757			181,784
Less:
Capitalized interest		(380	)		(3,245	)		(10,385	)		(8,893	)		(16,746	)		(17,885	)		(9,537	)
Earnings before fixed charges	$	33,395		$	26,082		$	106,863		$	148,823		$	154,668		$	175,832		$	133,737
Fixed charges and Preferred Distributions:
Interest expense from continuing operations (including amortization)	$	33,321		$	32,535		$	136,410		$	141,604		$	152,096		$	165,647		$	171,164
Capitalized interest		380			3,245			10,385			8,893			16,746			17,885			9,537
Ground leases and other		338			291			1,212			1,226			1,241			1,225			1,083
Total Fixed Charges		34,039			36,071			148,007			151,723			170,083			184,757			181,784
Income allocated to preferred shareholders		1,998			1,998			7,992			7,992			7,992			7,992			7,992
Total Preferred Distributions		1,998			1,998			7,992			7,992			7,992			7,992			7,992
Total combined fixed charges and preferred distributions	$	36,037		$	38,069		$	155,999		$	159,715		$	178,075		$	192,749		$	189,776
Ratio of earnings to combined fixed charges and preferred distributions		(b	)		(b	)		(b	)		(b	)		(b	)		(b	)		(b	)

(a)

Amounts for the three-months ended March 31, 2011 and 2010 and for the years ended December 31, 2010, 2009, 2008, 2007 and 2006 have been reclassified to present properties sold. As a result, operations have been reclassified to discontinued operations from continuing operations for all periods presented.

(b)

Due to the registrant’s loss in the period, the coverage ratio was less than 1:1. The registrant must generate additional earnings of $2,642 and $11,987 for the three-months ended March 31, 2011 and 2010, respectively, to achieve a coverage ratio of 1:1. The registrant must also generate additional earnings of $49,136 for the year ended December 31, 2010, $10,892 for the year ended December 31, 2009, $23,407 for the year ended December 31, 2008, $16,917 for the year ended December 31, 2007 and $56,039 for the year ended December 31, 2006 to achieve the aforementioned coverage ratio.