	Years ended December 31,
	2020			2019		2018
Base rents	$	95,987,000		$	105,041,000	$	107,630,000
Expense recoveries		29,241,000			33,475,000		33,378,000
Percentage rent		1,778,000			971,000		725,000
Straight-line rents		(1,208,000	)		405,000		1,142,000
Amortization of intangible lease liabilities, net		1,373,000			2,827,000		4,361,000
Total rents	$	127,171,000		$	142,719,000	$	147,236,000

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. On January 31, 2020, the Company agreed to a cash payment in consideration for permitting a dark anchor tenant to terminate its lease prior to the contractual expiration at Metro Square. As a result of this termination, revenues for 2020, included approximately $7.1 million of other income. 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 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.

Annual future base rents due to be received under non-cancelable operating leases in effect at December 31, 2020 are approximately as follows (excluding those base rents applicable to properties classified as real estate held for sale):

2021	$	93,213,000
2022		85,973,000
2023		85,650,000
2024		75,194,000
2025		62,652,000
Thereafter		334,634,000
	$	737,316,000

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 $31.1 million, $34.4 million and $34.1 million for 2020, 2019 and 2018, respectively. Such amounts do not include amortization of intangible lease liabilities.