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Identified Intangible Assets and Liabilities

3 Months Ended

Mar. 31, 2013

Identified Intangible Assets and Liabilities [Abstract]

Identified Intangible Assets and Intangible Liabilities

10. Identified Intangible Assets and Liabilities

The following summarizes our identified intangible assets (primarily acquired in-place and above-market leases) and liabilities (primarily acquired below-market leases) as of March 31, 2013 and December 31, 2012.

	Balance as of
	March 31,		December 31,
(Amounts in thousands)	2013		2012
Identified intangible assets:
Gross amount	$	756,982	$	774,200
Accumulated amortization		(363,211)		(350,162)
Net	$	393,771	$	424,038
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	906,705	$	904,640
Accumulated amortization		(355,018)		(342,338)
Net	$	551,687	$	562,302

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $16,866,000 and $13,774,000 for the three months ended March 31, 2013 and 2012, 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, 2014 is as follows:

(Amounts in thousands)
2014	$	43,255
2015		40,188
2016		38,130
2017		32,777
2018		29,904

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $25,117,000 and $11,240,000 for the three months ended March 31, 2013 and 2012, 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, 2014 is as follows:

(Amounts in thousands)
2014	$	45,044
2015		39,467
2016		21,002
2017		17,659
2018		12,722

We are a tenant under ground leases for certain properties. Amortization of these acquired below-market leases, net of above-market leases resulted in an increase to rent expense of $1,198,000 and $344,000 for the three months ended March 31, 2013 and 2012, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2014 is as follows:

(Amounts in thousands)
2014	$	3,526
2015		3,526
2016		3,526
2017		3,526
2018		3,526

- 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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