Real Estate Intangibles (Tables)

3 Months Ended

Mar. 31, 2013

Real Estate Intangibles (Tables) [Abstract]

Summary of real estate intangibles excluding those classified as held for sale

		March 31, 2013		December 31, 2012
Assets:
	In place lease intangibles	$	678,368	$	541,729
	Above market tenant leases		56,024		56,086
	Below market ground leases		61,461		61,450
	Lease commissions		15,642		14,419
	Gross historical cost		811,495		673,684
	Accumulated amortization		(315,229)		(257,242)
	Net book value	$	496,266	$	416,442
	Weighted-average amortization period in years		13.7		16.4
Liabilities:
	Below market tenant leases	$	77,058	$	77,036
	Above market ground leases		9,490		9,490
	Gross historical cost		86,548		86,526
	Accumulated amortization		(29,652)		(27,753)
	Net book value	$	56,896	$	58,773
	Weighted-average amortization period in years		14.2		14.3

Schedule of Real Estate Intangible Amortization

	Three Months Ended
	March 31,
	2013		2012
Rental income related to above/below market tenant leases, net	$	148	$	552
Property operating expenses related to above/below market ground leases, net		(320)		(300)
Depreciation and amortization related to in place lease intangibles and lease commissions		(50,576)		(27,605)

		Assets		Liabilities
2013	$	162,891	$	5,296
2014		91,723		6,608
2015		29,373		5,604
2016		23,039		5,220
2017		23,504		4,899
Thereafter		165,736		29,269
Totals	$	496,266	$	56,896