Exhibit 12.1

BioMed Realty Trust, Inc.

Statement of Computation of Ratios

	6 Mo. Ended June 30,			Year Ended December 31,
	2012			2011			2010			2009			2008			2007
Earnings:
Add:
Income from continuing operations before noncontrolling interests and income/loss from unconsolidated joint ventures	$	2,088		$	44,729		$	39,256		$	60,798		$	62,563		$	72,528
Amortization of interest capitalized		2,560			4,613			4,456			3,009			1,308			112
Distributions from unconsolidated joint ventures		1,088			2,428			1,374			586			687			357
Fixed charges (see below)		50,494			96,749			91,515			77,095			83,008			85,927
Subtract:
Interest capitalized		(4,450	)		(7,568	)		(5,442	)		(12,405	)		(42,320	)		(58,132	)
Total earnings	$	51,780		$	140,951		$	131,159		$	129,083		$	105,246		$	100,792
Fixed charges:
Interest expensed, net		46,044			89,181			86,073			64,690			40,688			27,795
Interest capitalized		4,450			7,568			5,442			12,405			42,320			58,132
Total fixed charges	$	50,494		$	96,749		$	91,515		$	77,095		$	83,008		$	85,927
Ratio of earnings to fixed charges		1.0			1.5			1.4			1.7			1.3			1.2
Ratio of earnings to fixed charges and preferred stock dividends		0.9			1.2			1.2			1.4			1.1			1.0
Preferred stock dividends	$	7,301		$	16,033		$	16,963		$	16,963		$	16,963		$	16,868

BioMed Realty L.P.

Statement of Computation of Ratios

	6 Mo. Ended June 30,			Year Ended December 31,
	2012			2011			2010			2009			2008			2007
Earnings:
Add:
Income from continuing operations before noncontrolling interests and income/loss from unconsolidated joint ventures	$	2,088		$	44,729		$	39,256		$	60,798		$	62,563		$	72,528
Amortization of interest capitalized		2,560			4,613			4,456			3,009			1,308			112
Distributions from unconsolidated joint ventures		1,088			2,428			1,374			586			687			357
Fixed charges (see below)		50,494			96,749			91,515			77,095			83,008			85,927
Subtract:
Interest capitalized		(4,450	)		(7,568	)		(5,442	)		(12,405	)		(42,320	)		(58,132	)
Total earnings	$	51,780		$	140,951		$	131,159		$	129,083		$	105,246		$	100,792
Fixed charges:
Interest expensed, net		46,044			89,181			86,073			64,690			40,688			27,795
Interest capitalized		4,450			7,568			5,442			12,405			42,320			58,132
Total fixed charges	$	50,494		$	96,749		$	91,515		$	77,095		$	83,008		$	85,927
Ratio of earnings to fixed charges		1.0			1.5			1.4			1.7			1.3			1.2
Ratio of earnings to fixed charges and preferred unit distributions		0.9			1.2			1.2			1.4			1.1			1.0
Preferred unit distributions	$	7,301		$	16,033		$	16,963		$	16,963		$	16,963		$	16,868