	Years ended December 31,
	2018		2017		2016
Base rents	$	107,630,000	$	108,998,000	$	114,655,000
Percentage rent		725,000		896,000		654,000
Straight-line rents		1,142,000		864,000		38,000
Amortization of intangible lease liabilities, net		4,361,000		2,518,000		2,751,000
Total rents	$	113,858,000	$	113,276,000	$	118,098,000

In April 2018, the Company accepted a cash payment of $4.3 million in consideration for permitting a dark anchor tenant to terminate its lease prior to the contractual expiration. As a result of this termination, revenues for the nine months ended September 30, 2018 includes $5.4 million, consisting of (1) $3.8 million of other income (the $4.3 million cash payment reduced by $0.5 million straight-line rent receivable) and (2) $1.5 million accelerated intangible lease liability amortization. The Company recognizes lease termination income when the following conditions are met: (1) the lease termination agreement has been executed, (2) the lease termination fee is determinable, (3) all the Company’s landlord services pursuant to the terminated lease have been rendered, and (4) collectability of the lease termination fee is assured.

Annual future base rents due to be received under non-cancelable operating leases in effect at December 31, 2018 are approximately as follows (excluding those base rents applicable to properties classified as real estate held for sale):

2019	$	101,244,000
2020		89,291,000
2021		75,240,000
2022		63,577,000
2023		56,443,000
Thereafter		204,677,000
	$	590,472,000

Total future minimum rents do not include expense recoveries for real estate taxes and operating costs, or percentage rents based upon tenants’ sales volume. Such additional revenue amounts aggregated approximately $34.1 million, $32.1 million and $32.7 million for 2018, 2017 and 2016, respectively. Such amounts do not include amortization of intangible lease liabilities.