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Identified Intangible Assets and Liabilities

12 Months Ended

Dec. 31, 2012

Identified Intangible Assets and Liabilities [Abstract]

Identified Intangible Assets and Intangible Liabilities

9. Identified Intangible Assets and Liabilities

The following summarizes our identified intangible assets (primarily acquired above-market leases) and liabilities (primarily acquired below-market leases) as of December 31, 2012 and 2011.

	Balance as of
	December 31,		December 31,
(Amounts in thousands)	2012		2011
Identified intangible assets:
Gross amount	$	726,981	$	631,162
Accumulated amortization		(356,379)		(343,318)
Net	$	370,602	$	287,844
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	805,811	$	838,103
Accumulated amortization		(342,379)		(371,360)
Net	$	463,432	$	466,743

Amortization of acquired below-market leases, net of acquired above-market leases resulted in an increase to rental income of $54,193,000, $62,105,000 and $65,373,000 for the years ended December 31, 2012, 2011 and 2010, respectively. Estimated annual amortization of acquired below-market leases, net of acquired above-market leases for each of the five succeeding years commencing January 1, 2013 is as follows:

(Amounts in thousands)
2013	$	45,098
2014		39,304
2015		36,533
2016		34,088
2017		28,610

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $51,244,000, $54,126,000 and $56,949,000 for the years ended December 31, 2012, 2011 and 2010, respectively. Estimated annual amortization of all other identified intangible assets including acquired in-place leases, customer relationships, and third party contracts for each of the five succeeding years commencing January 1, 2013 is as follows:

(Amounts in thousands)
2013	$	47,959
2014		29,785
2015		24,812
2016		22,300
2017		19,735

We are a tenant under ground leases at certain properties. Amortization of these acquired below-market leases, net of above-market leases resulted in an increase to rent expense of $1,712,000, $1,377,000 and $2,157,000 for the years ended December 31, 2012, 2011 and 2010, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2013 is as follows:

(Amounts in thousands)
2013	$	2,933
2014		2,918
2015		2,918
2016		2,918
2017		2,918

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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