Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
BIOMED REALTY TRUST, INC. [Member]
Net income available to common stockholders /unitholders and noncontrolling interests	$ 3,706	$ 4,294	$ 9,343	$ 8,715
Other comprehensive income:
Unrealized gain on derivative instruments, net	892	2,897	3,461	5,825
Amortization of deferred interest costs	1,760	1,781	3,525	3,567
Equity in other comprehensive income/(loss) of unconsolidated partnerships	8	4	36	(11)
Deferred settlement payments on interest rate swaps, net	(36)	(240)	(88)	(485)
Reclassification of unrealized loss on equity securities	825		825
Reclassification on sale of equity securities				(538)
Unrealized loss on equity securities	(1,375)		(3,692)
Total other comprehensive income	2,074	4,442	4,067	8,358
Comprehensive income	5,780	8,736	13,410	17,073
Comprehensive income attributable to noncontrolling interests	(114)	(206)	(265)	(440)
Comprehensive income attributable to common stockholders	5,666	8,530	13,145	16,633
BIOMED REALTY, L.P. [Member]
Net income available to common stockholders /unitholders and noncontrolling interests	3,706	4,294	9,343	8,715
Other comprehensive income:
Unrealized gain on derivative instruments, net	892	2,897	3,461	5,825
Amortization of deferred interest costs	1,760	1,781	3,525	3,567
Equity in other comprehensive income/(loss) of unconsolidated partnerships	8	4	36	(11)
Deferred settlement payments on interest rate swaps, net	(36)	(240)	(88)	(485)
Reclassification of unrealized loss on equity securities	825		825
Reclassification on sale of equity securities				(538)
Unrealized loss on equity securities	(1,375)		(3,692)
Total other comprehensive income	2,074	4,442	4,067	8,358
Comprehensive income	$ 5,780	$ 8,736	$ 13,410	$ 17,073