Rental and Other Revenues; Rental Property and Other Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Rental and Other Revenues; Rental Property And Other Expenses [Abstract]

Schedule of Rental and Other Revenues

Our real estate assets are leased to customers under operating leases. The minimum rental amounts under the leases are generally subject to scheduled fixed increases. Generally, the leases also require that the customers reimburse us for increases in certain costs above the base-year costs. The following table sets forth rental and other revenues from continuing operations:

	Year Ended December 31,
	2011			2010			2009
Contractual rents, net	$	420,285		$	398,224		$	392,360
Straight-line rental income, net	12,828			11,349			3,644
Amortization of lease incentives	(1,371		)	(1,239		)	(1,100		)
Property operating expense recoveries, net	36,105			41,736			44,462
Lease termination fees	2,443			2,992			1,813
Fee income	5,571			5,466			5,155
Other miscellaneous operating revenues	6,991			2,598			1,684
	$	482,852		$	461,126		$	448,018

Schedule of Future Minimum Rental Payments for Operating Leases

The following table sets forth scheduled future minimum base rents to be received from customers for leases in effect at December 31, 2011 for the Wholly Owned Properties:

2012	$	448,420
2013	409,453
2014	352,743
2015	297,859
2016	247,283
Thereafter	809,042
	$	2,564,800

Operating Costs and Other Expenses [Table Text Block]

The following table sets forth rental property and other expenses from continuing operations:

	Year Ended December 31,
	2011		2010		2009
Utilities, insurance and real estate taxes	$	97,156	$	90,838	$	91,173
Maintenance, cleaning and general building	61,700		56,877		55,840
Property management and administrative expenses	11,624		11,203		11,702
Other miscellaneous operating expenses	5,668		4,720		3,310
	$	176,148	$	163,638	$	162,025