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Identified Intangible Assets and Liabilities
9 Months Ended
Sep. 30, 2013
Identified Intangible Assets and Liabilities [Abstract]  
Identified Intangible Assets and Liabilities

9. 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 September 30, 2013 and December 31, 2012.

 

   Balance as of 
  September 30, December 31, 
 (Amounts in thousands)2013 2012 
 Identified intangible assets:      
 Gross amount$ 572,641 $ 752,922 
 Accumulated amortization  (297,391)   (346,613) 
 Net$ 275,250 $ 406,309 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 811,917 $ 902,525 
 Accumulated amortization  (372,329)   (341,536) 
 Net$ 439,588 $ 560,989 

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $11,820,000 and $13,256,000 for the three months ended September 30, 2013 and 2012, respectively, and $40,326,000 and $39,569,000 for the nine months ended September 30, 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$ 41,069 
 2015  38,263 
 2016  36,321 
 2017  30,936 
 2018  29,171 

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $11,257,000 and $11,415,000 for the three months ended September 30, 2013 and 2012, respectively, and $53,339,000 and $35,519,000 for the nine months ended September 30, 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$ 26,708 
 2015  21,543 
 2016  18,363 
 2017  15,203 
 2018  11,005 

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 $981,000 and $312,000 for the three months ended September 30, 2013 and 2012, respectively, and $3,704,000 and $894,000 for the nine months ended September 30, 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$ 3,921 
 2015  3,921 
 2016  3,921 
 2017  3,921 
 2018  3,921