Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Tables)

9 Months Ended

Sep. 30, 2012

Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards

Summary of the entity's investment in real estate assets, excluding assets held for sale

	As of September 30,
	2012	2011
Commercial real estate:
Number of properties	37	35
Rentable square feet	7,439,195	6,929,891