Real Estate Investments (Tables)

3 Months Ended

Mar. 31, 2012

Real Estate [Abstract]

Gross carrying value of the Company's Properties

	March 31, 2012		December 31, 2011
Land	$	666,152	$	677,891
Building and improvements	3,583,832		3,631,388
Tenant improvements	467,140		483,801
	$	4,717,124	$	4,793,080