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Identified Intangible Assets and Liabilities
9 Months Ended
Sep. 30, 2014
Identified Intangible Assets and Liabilities [Abstract]  
Identified Intangible Assets and 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 September 30, 2014 and December 31, 2013.

 

   Balance as of 
  September 30, December 31, 
 (Amounts in thousands)2014 2013 
 Identified intangible assets:      
 Gross amount$ 503,993 $ 589,961 
 Accumulated amortization  (223,786)   (277,998) 
 Net$ 280,207 $ 311,963 
 Identified intangible liabilities (included in deferred revenue):      
 Gross amount$ 843,941 $ 856,933 
 Accumulated amortization  (385,824)   (360,398) 
 Net$ 458,117 $ 496,535 

Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental income of $10,039,000 and $11,145,000 for the three months ended September 30, 2014 and 2013, respectively, and $32,201,000 and $38,322,000 for the nine months ended September 30, 2014 and 2013, 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, 2015 is as follows:

 (Amounts in thousands)   
 2015$ 40,071 
 2016  38,455 
 2017  34,890 
 2018  33,381 
 2019  30,105 

Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $6,296,000 and $10,686,000 for the three months ended September 30, 2014 and 2013, respectively, and $22,996,000 and $52,997,000 for the nine months ended September 30, 2014 and 2013, 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, 2015 is as follows:

 (Amounts in thousands)   
 2015$ 23,160 
 2016  20,195 
 2017  16,813 
 2018  12,446 
 2019  11,539 

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 $858,000 and $981,000 for the three months ended September 30, 2014 and 2013, respectively, and $2,572,000 and $3,704,000 for the nine months ended September 30, 2014 and 2013, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2015 is as follows:

 

 (Amounts in thousands)   
 2015$ 3,430 
 2016  3,430 
 2017  3,430 
 2018  3,430 
 2019  3,430