Biomed Realty Trust 8-K Entry into a Material Definitive Agreement

EXHIBIT 12.1

BIOMED REALTY TRUST, INC.

CALCULATION OF RATIOS OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS

															BioMed Realty Trust, Inc.
	BioMed Realty Trust, Inc.														Predecessor
															Historical
															Combined		Historical Combined
	Pro Forma Consolidated						Historical Consolidated Period								Period		Year Ended
										Year							December 31,
	Nine Months			Year			Nine Months			Ended
	Ended			Ended			Ended			December					January 1 -
	September 30,			December 31,			September 30,			31,			August 11 -		August 17,
	2006			2005			2006			2005			December 31, 2004		2004		2003		2002		2001
Earnings:
Add:
Income before minority interests in property partnerships, minority interest in Operating Partnership		23,521			18,053			23,521			18,053			5,051		1,001		2,334		1,660		1,058
Amortization of interest capitalized		32			20			32			20			6		11		17		17		13
Distributions from unconsolidated joint ventures		100			106			100			106			27		—		—		—		—
Fixed charges (less preferred dividends, see below)		21,842			12,494			31,667			23,934			1,180		1,760		2,901		3,154		2,966
Subtract:
Interest capitalized		(1,284	)		(708	)		(1,284	)		(708	)		—		—		—		—		(244	)
Total earnings		44,211			29,965			54,036			41,405			6,264		2,772		5,252		4,831		3,793
Fixed charges:
Interest expensed		20,558			11,786			30,383			23,226			1,180		1,760		2,901		3,154		2,722
Preferred dividends		11,063			14,750			—			—			—		—		—		—		—
Interest capitalized		1,284			708			1,284			708			—		—		—		—		244
Total fixed charges		32,905			27,244			31,667			23,934			1,180		1,760		2,901		3,154		2,966
Ratios of Earnings to Combined Fixed Charges and Preferred Dividends		1.3			1.1			1.7			1.7			5.3		1.6		1.8		1.5		1.3