Consolidated Statements of Income (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Expenses:
Equity in net loss of unconsolidated partnerships	$ (466)	$ (100)	$ (1,115)	$ (377)
Gain/(loss) on derivative instruments	383	(497)	(628)	(347)
Net income attributable to common stockholders/unitholders	3,638	4,199	9,168	8,499
Net income per share available to common stockholders/unitholders:
Basic and diluted earnings per share/unit	$ 0.03	$ 0.04	$ 0.07	$ 0.08
Weighted-average common shares/units outstanding:
Basic	129,858,098	109,707,274	129,815,154	104,000,339
Diluted	132,840,932	113,956,077	132,803,097	108,298,135
BIOMED REALTY TRUST, INC. [Member]
Revenues:
Rental	81,436	72,380	161,653	142,980
Tenant recoveries	24,821	20,273	49,402	41,099
Other income	541	259	1,288	1,589
Total revenues	106,798	92,912	212,343	185,668
Expenses:
Rental operations	21,162	17,077	41,678	34,928
Real estate taxes	10,338	8,703	21,020	17,424
Depreciation and amortization	35,788	26,469	69,625	55,385
General and administrative	7,519	6,449	14,940	12,718
Acquisition related expenses	334	1,819	653	1,968
Total expenses	75,141	60,517	147,916	122,423
Income from operations	31,657	32,395	64,427	63,245
Equity in net loss of unconsolidated partnerships	(466)	(100)	(1,115)	(377)
Interest income	79	51	204	71
Interest expense	(23,457)	(21,870)	(44,772)	(43,131)
Gain/(loss) on derivative instruments	383	(497)	(628)	(347)
Loss on extinguishment of debt	(249)	(1,444)	(292)	(2,265)
Net income	7,947	8,535	17,824	17,196
Net income/loss attributable to noncontrolling interests	(68)	(95)	(175)	(216)
Net income attributable to the Company/Operating Partnership	7,879	8,440	17,649	16,980
Preferred stock dividends/unit distributions	(4,241)	(4,241)	(8,481)	(8,481)
Net income attributable to common stockholders/unitholders	3,638	4,199	9,168	8,499
Net income per share available to common stockholders/unitholders:
Basic and diluted earnings per share/unit	$ 0.03	$ 0.04	$ 0.07	$ 0.08
Weighted-average common shares/units outstanding:
Basic	129,858,098	109,707,274	129,815,154	104,000,339
Diluted	132,840,932	113,956,077	132,803,097	108,298,135
BIOMED REALTY, L.P. [Member]
Revenues:
Rental	81,436	72,380	161,653	142,980
Tenant recoveries	24,821	20,273	49,402	41,099
Other income	541	259	1,288	1,589
Total revenues	106,798	92,912	212,343	185,668
Expenses:
Rental operations	21,162	17,077	41,678	34,928
Real estate taxes	10,338	8,703	21,020	17,424
Depreciation and amortization	35,788	26,469	69,625	55,385
General and administrative	7,519	6,449	14,940	12,718
Acquisition related expenses	334	1,819	653	1,968
Total expenses	75,141	60,517	147,916	122,423
Income from operations	31,657	32,395	64,427	63,245
Equity in net loss of unconsolidated partnerships	(466)	(100)	(1,115)	(377)
Interest income	79	51	204	71
Interest expense	(23,457)	(21,870)	(44,772)	(43,131)
Gain/(loss) on derivative instruments	383	(497)	(628)	(347)
Loss on extinguishment of debt	(249)	(1,444)	(292)	(2,265)
Net income	7,947	8,535	17,824	17,196
Net income/loss attributable to noncontrolling interests	14	14	32	21
Net income attributable to the Company/Operating Partnership	7,961	8,549	17,856	17,217
Preferred stock dividends/unit distributions	(4,241)	(4,241)	(8,481)	(8,481)
Net income attributable to common stockholders/unitholders	$ 3,720	$ 4,308	$ 9,375	$ 8,736
Net income per share available to common stockholders/unitholders:
Basic and diluted earnings per share/unit	$ 0.03	$ 0.04	$ 0.07	$ 0.08
Weighted-average common shares/units outstanding:
Basic	132,782,072	112,582,265	132,742,123	106,890,664
Diluted	132,782,072	113,956,077	132,742,123	108,298,135