Real Estate Intangibles (Tables)

12 Months Ended

Dec. 31, 2013

Real Estate Intangibles (Tables) [Abstract]

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

The following is a summary of our real estate intangibles, excluding those classified as held for sale, as of the dates indicated (dollars in thousands):

		December 31, 2013		December 31, 2012
Assets:
	In place lease intangibles	$	937,357	$	541,729
	Above market tenant leases		55,939		56,086
	Below market ground leases		59,165		61,450
	Lease commissions		18,293		14,419
	Gross historical cost		1,070,754		673,684
	Accumulated amortization		(571,008)		(257,242)
	Net book value	$	499,746	$	416,442
	Weighted-average amortization period in years		16.7		16.4
Liabilities:
	Below market tenant leases	$	76,381	$	77,036
	Above market ground leases		9,490		9,490
	Gross historical cost		85,871		86,526
	Accumulated amortization		(34,434)		(27,753)
	Net book value	$	51,437	$	58,773
	Weighted-average amortization period in years		14.3		14.3

Schedule of Real Estate Intangible Amortization

The following is a summary of real estate intangible amortization for the periods presented (in thousands):

	Year Ended December 31,
	2013		2012		2011
Rental income related to above/below market tenant leases, net	$	748	$	1,120	$	3,340
Property operating expenses related to above/below market ground leases, net		(1,208)		(1,285)		(1,161)
Depreciation and amortization related to in place lease intangibles and lease commissions		(246,938)		(103,044)		(98,856)

Schedule Of Future Intangible Amortization

The future estimated aggregate amortization of intangible assets and liabilities is as follows for the periods presented (in thousands):

		Assets		Liabilities
2014	$	217,179	$	6,623
2015		60,154		5,646
2016		27,400		5,232
2017		21,393		4,937
2018		18,532		4,610
Thereafter		155,088		24,389
Totals	$	499,746	$	51,437