Investment in Unconsolidated Partnerships (Summary of Selected Income Statement information) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total revenues	$ 9,609	$ 9,286	$ 18,964	$ 17,014
Rental operations expenses and real estate taxes	5,186	4,863	10,955	9,278
Depreciation and amortization	4,710	3,460	9,306	6,765
Professional fees	139	148	367	552
Interest expense, net of interest income	3,285	2,533	6,720	5,014
Total expenses	13,320	11,004	27,348	21,609
Net loss	(3,711)	(1,718)	(8,384)	(4,595)
Company's equity in net loss of unconsolidated partnerships	(466)	(100)	(1,115)	(377)
BIOMED REALTY TRUST, INC. [Member]
Company's equity in net loss of unconsolidated partnerships	$ (466)	$ (100)	$ (1,115)	$ (377)