Consolidated Balance Sheets (Parenthetical) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
BIOMED REALTY TRUST, INC. [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock/units, liquidation preference, total	$ 230,000,000	$ 230,000,000
Preferred stock/units, liquidation preference per share	$ 25	$ 25
Preferred stock, shares issued	9,200,000	9,200,000
Preferred stock, shares outstanding	9,200,000	9,200,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	131,259,602	131,046,509
Common stock, shares outstanding	131,259,602	131,046,509
BIOMED REALTY, L.P. [Member]
Limited partners' capital account, units issued	2,979,979	3,001,250
Limited partners' capital account, units outstanding	2,979,979	3,001,250
General partners' capital account, units issued	131,259,602	131,046,509
General partners' capital account, units outstanding	131,259,602	131,046,509