Brandywine Operating Partnership 8-K Entry into a Material Definitive Agreement

Exhibit 12.1

Brandywine Realty Trust

Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Share Distributions

(in thousands)

	Nine-months ended			For the years ended December 31,
	30-Sep-12			2011			2010			2009			2008			2007
Earnings before fixed charges:
Add:
Income (loss) from continuing operations before non-controlling interest and equity in earnings from unconsolidated real estate ventures (a)	$	(4,796	)	$	(22,740	)	$	(42,629	)	$	(4,849	)	$	(15,199	)	$	(2,245	)
Distributed income of equity investees		357			2,600			657			1,557			7,639			6,900
Amortization of capitalized interest		3,531			3,564			3,527			3,166			2,801			2,170
Fixed charges — per below		107,004			140,356			148,500			152,126			170,589			185,308
Less:
Capitalized interest		(1,978	)		(1,997	)		(10,385	)		(8,893	)		(16,746	)		(17,885	)
Preferred Distributions of consolidated subsidiaries		—			—			—			—			—			—
Earnings before fixed charges	$	104,118		$	121,783		$	99,670		$	143,107		$	149,084		$	174,248
Fixed charges and Preferred Distributions:
Interest expense from continuing operations (including amortization)		103,535			136,396			136,410		$	141,604		$	152,096		$	165,647
Capitalized interest		1,978			1,997			10,385			8,893			16,746			17,885
Ground leases and other		1,491			1,963			1,705			1,629			1,747			1,776
Total Fixed Charges		107,004			140,356			148,500			152,126			170,589			185,308
Income allocated to preferred shareholders		7,832			7,992			7,992			7,992			7,992			7,992
Preferred share redemption charge		2,090			—			—			—			—			—
Total Preferred Distributions		9,922			7,992			7,992			7,992			7,992			7,992
Total combined fixed charges and preferred distributions	$	116,926		$	148,348		$	156,492		$	160,118		$	178,581		$	193,300
Ratio of earnings to combined fixed charges and preferred distributions		(b)			(b)			(b)			(b)			(b)			(b)

(a) Amounts for the years ended December 31, 2011, 2010, 2009, 2008, and 2007 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 $12,808 for the nine-months ended September 30, 2012, $26,565 for the year ended December 31, 2011, $56,822 for the year ended December 31, 2010, $17,011 for the year ended December 31, 2009, $29,497 for the year ended December 31, 2008, and $19,052 for the year ended December 31, 2007 to achieve a coverage ratio of 1:1.