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Deferred Revenue, Intangibles, Net and Other Liabilities
12 Months Ended
Dec. 31, 2017
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue, Intangibles, Net and Other Liabilities
Deferred Revenue, Intangibles, Net and Other Liabilities 
 
Deferred revenue and other liabilities consist of the unamortized fair value of below market lease liabilities recorded in connection with purchase accounting, retainage payables for development and redevelopment projects, and tenant rent payments received in advance of the month in which they are due.  The amortization of below market lease liabilities is recognized as revenue over the remaining life of the leases (including option periods for leases with below market renewal options) through 2046.  Tenant rent payments received in advance are recognized as revenue in the period to which they apply, which is typically the month following their receipt.
 
At December 31, 2017 and 2016, deferred revenue, intangibles, net and other liabilities consisted of the following:
 
($ in thousands)
 
2017
 
2016
Unamortized in-place lease liabilities
 
$
83,117

 
$
95,360

Retainages payable and other
 
3,954

 
5,437

Tenant rents received in advance
 
9,493

 
11,405

Total
 
$
96,564

 
$
112,202


 
The amortization of below market lease intangibles is included as a component of minimum rent in the accompanying consolidated statements and was $7.7 million, $13.5 million and $10.2 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The estimated net amounts of amortization of in-place lease liabilities and the increasing effect on minimum rent for each of the next five years and thereafter is as follows:  
($ in thousands)
 
2018
$
6,304

2019
4,953

2020
4,454

2021
4,132

2022
3,957

Thereafter
59,317

Total
$
83,117