Exhibit 12.1

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

	For the years ended December 31,
	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)	$	(34,943	)	$	1,270		$	(9,109	)	$	(110	)	$	(42,168	)
Distributed income of equity investees		657			1,557			7,639			6,900			2,150
Amortization of capitalized interest		3,527			3,166			2,801			2,170			1,508
Fixed charges — per below		148,500			152,126			170,589			185,308			182,012
Less:
Capitalized interest		(10,385	)		(8,893	)		(16,746	)		(17,885	)		(9,537	)
Preferred Distributions of consolidated subsidiaries					—			—			—			—
Earnings before fixed charges	$	107,356		$	149,226		$	155,174		$	176,383		$	133,965
Fixed charges and Preferred Distributions:
Interest expense from continuing operations (including amortization)	$	136,410		$	141,604		$	152,096		$	165,647		$	171,164
Capitalized interest		10,385			8,893			16,746			17,885			9,537
Ground leases and other		1,705			1,629			1,747			1,776			1,311
Distributions to preferred unitholders in Operating Partnership		—			—			—			—			—
Total Fixed Charges		148,500			152,126			170,589			185,308			182,012
Income allocated to preferred shareholders		7,992			7,992			7,992			7,992			7,992
Total Preferred Distributions		7,992			7,992			7,992			7,992			7,992
Total combined fixed charges and preferred distributions	$	156,492		$	160,118		$	178,581		$	193,300		$	190,004
Ratio of earnings to combined fixed charges and preferred distributions		(b	)		(b	)		(b	)		(b	)		(b	)

(a)

Amounts 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 $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 a coverage ratio of 1:1.