Note 15. Rental Revenues

Rental revenues for 2011, 2010 and 2009 are comprised of the following:


	2011		2010		2009
Base rents	$	97,437,000	$	93,493,000	$	98,216,000
Percentage rent		1,058,000		906,000		998,000
Straight-line rents		1,221,000		1,577,000		2,593,000
Amortization of intangible lease liabilities		5,736,000		6,094,000		11,234,000
	$	105,452,000	$	102,070,000	$	113,041,000

Annual future base rents due to be received under non-cancelable operating leases in effect at December 31, 2011 are approximately as follows (excluding those base rents applicable to properties treated as discontinued operations):


2012	$	98,863,000
2013		94,271,000
2014		84,973,000
2015		74,732,000
2016		62,253,000
Thereafter		319,301,000
	$	734,393,000

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 $28.0 million, $26.6 million and $28.3 million for 2011, 2010 and 2009, respectively. In addition, such amounts do not include amortization of intangible lease liabilities.