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Intangible Assets
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
At December 31, 2016 and 2015, intangible assets included the following (in thousands):
 
 
2016
 
2015
In-place leases, net of accumulated amortization of $46,899 and $88,035 in 2016 and 2015, respectively
 
$
185,251

 
$
112,937

Above-market tenant leases, net of accumulated amortization of $6,515 and $15,423 in 2016 and 2015, respectively
 
40,260

 
8,031

Below-market ground lease, net of accumulated amortization of $69 in 2016
 
18,344

 
—

Goodwill
 
1,674

 
3,647

 
 
$
245,529

 
$
124,615


Intangible assets, other than goodwill, mainly relate to the acquisitions in 2016, 2015, and 2014 (see note 3). Aggregate net amortization expense related to intangible assets and liabilities was $24.0 million, $23.7 million, and $32.7 million for the years ended December 31, 2016, 2015, and 2014, respectively. Over the next five years and thereafter, aggregate amortization of these intangible assets and liabilities is anticipated to be as follows (in thousands):
 
Below Market
Rents
 
Above Market
Ground Lease
 
Below Market Ground Lease
 
Above Market
Rents
 
In Place Leases
 
Total
2017
$
(15,591
)
 
$
(46
)
 
$
487

 
$
9,169

 
$
47,877

 
$
41,896

2018
(14,460
)
 
(46
)
 
470

 
8,225

 
36,574

 
30,763

2019
(12,754
)
 
(46
)
 
454

 
6,316

 
27,993

 
21,963

2020
(11,532
)
 
(46
)
 
439

 
5,043

 
22,000

 
15,904

2021
(9,634
)
 
(46
)
 
425

 
3,805

 
16,879

 
11,429

Thereafter
(23,999
)
 
(1,581
)
 
16,069

 
7,702

 
33,928

 
32,119

 
$
(87,970
)
 
$
(1,811
)
 
$
18,344

 
$
40,260

 
$
185,251

 
$
154,074

Weighted average remaining lease term
7 years

 
39 years

 
67 years

 
6 years

 
6 years

 
10 years


Goodwill relates entirely to the Company's office assets. As office assets are sold, either by the Company or by joint ventures in which the Company has an interest, goodwill is allocated to the cost of each sale. The following is a summary of goodwill activity for the years ended December 31, 2016 and 2015 (in thousands):
 
2016
 
2015
Beginning Balance
$
3,647

 
$
3,867

Allocated to property sales and Spin-Off
(1,973
)
 
(220
)
Ending Balance
$
1,674

 
$
3,647