Consolidated Balance Sheets (USD $)	Jun. 30, 2011		Dec. 31, 2010
ASSETS
Investments in real estate, net	$ 3,584,259,000		$ 3,536,114,000
Investments in unconsolidated partnerships	55,313,000		57,265,000
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable, net	623,121,000		657,922,000
Exchangeable senior notes, net	199,706,000		199,522,000
Unsecured senior notes, net	645,246,000		247,571,000
Unsecured line of credit	121,200,000	[1]	392,450,000	[1]
BIOMED REALTY TRUST, INC. [Member]
ASSETS
Investments in real estate, net	3,584,259,000		3,536,114,000
Investments in unconsolidated partnerships	55,313,000		57,265,000
Cash and cash equivalents	12,033,000		21,467,000
Restricted cash	6,614,000		9,971,000
Accounts receivable, net	2,486,000		5,874,000
Accrued straight-line rents, net	116,896,000		106,905,000
Acquired above-market leases, net	26,340,000		30,566,000
Deferred leasing costs, net	123,299,000		125,060,000
Deferred loan costs, net	12,325,000		11,499,000
Other assets	53,285,000		55,033,000
Total assets	3,992,850,000		3,959,754,000
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable, net	623,121,000		657,922,000
Exchangeable senior notes, net	199,706,000		199,522,000
Unsecured senior notes, net	645,246,000		247,571,000
Unsecured line of credit	121,200,000		392,450,000
Security deposits	11,571,000		11,749,000
Dividends and distributions payable	31,089,000		27,029,000
Accounts payable, accrued expenses and other liabilities	79,274,000		98,826,000
Derivative instruments	580,000		3,826,000
Acquired below-market leases, net	7,201,000		7,963,000
Total liabilities	1,718,988,000		1,646,858,000
Stockholders' equity:/Partners' capital:
Preferred stock, $.01 par value, 15,000,000 shares authorized: 7.375% Series A cumulative redeemable preferred stock, $230,000,000 liquidation preference ($25.00 per share), 9,200,000 shares issued and outstanding at June 30, 2011 and December 31, 2010	222,413,000		222,413,000
Common stock, $.01 par value, 200,000,000 shares authorized, 131,259,602 and 131,046,509 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	1,313,000		1,310,000
Additional paid-in capital	2,371,762,000		2,371,488,000
Accumulated other comprehensive loss	(66,880,000)		(70,857,000)
Dividends in excess of earnings	(264,507,000)		(221,176,000)
Total stockholders' equity	2,264,101,000		2,303,178,000
Noncontrolling interests /Noncontrolling interests deficit	9,761,000		9,718,000
Total equity/capital	2,273,862,000		2,312,896,000
Total liabilities and equity/capital	3,992,850,000		3,959,754,000
BIOMED REALTY, L.P. [Member]
ASSETS
Investments in real estate, net	3,584,259,000		3,536,114,000
Investments in unconsolidated partnerships	55,313,000		57,265,000
Cash and cash equivalents	12,033,000		21,467,000
Restricted cash	6,614,000		9,971,000
Accounts receivable, net	2,486,000		5,874,000
Accrued straight-line rents, net	116,896,000		106,905,000
Acquired above-market leases, net	26,340,000		30,566,000
Deferred leasing costs, net	123,299,000		125,060,000
Deferred loan costs, net	12,325,000		11,499,000
Other assets	53,285,000		55,033,000
Total assets	3,992,850,000		3,959,754,000
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable, net	623,121,000		657,922,000
Exchangeable senior notes, net	199,706,000		199,522,000
Unsecured senior notes, net	645,246,000		247,571,000
Unsecured line of credit	121,200,000		392,450,000
Security deposits	11,571,000		11,749,000
Dividends and distributions payable	31,089,000		27,029,000
Accounts payable, accrued expenses and other liabilities	79,274,000		98,826,000
Derivative instruments	580,000		3,826,000
Acquired below-market leases, net	7,201,000		7,963,000
Total liabilities	1,718,988,000		1,646,858,000
Stockholders' equity:/Partners' capital:
Preferred units, 7.375% Series A cumulative redeemable preferred units, $230,000,000 liquidation preference ($25.00 per unit), 9,200,000 units issued and outstanding at June 30, 2011 and December 31, 2010	222,413,000		222,413,000
Limited partners' capital, 2,979,979 and 3,001,250 units issued and outstanding at June 30, 2011 and December 31, 2010, respectively	9,993,000		9,918,000
General partner's capital, 131,239,482 and 131,046,509 units issued and outstanding at June 30, 2011 and December 31, 2010, respectively	2,107,170,000		2,150,314,000
Accumulated other comprehensive loss	(65,482,000)		(69,549,000)
Total partners' capital	2,274,094,000		2,313,096,000
Noncontrolling interests /Noncontrolling interests deficit	(232,000)		(200,000)
Total equity/capital	2,273,862,000		2,312,896,000
Total liabilities and equity/capital	$ 3,992,850,000		$ 3,959,754,000

[1] At June 30, 2011, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $591.0 million (net of outstanding letters of credit issued by the Operating Partnership and drawable on the unsecured line of credit of approximately $7.8 million). On July 14, 2011, the Operating Partnership entered into a new $750.0 million unsecured line of credit, replacing its existing line of credit, as described below in this Note 5.