Rental revenues for the three and six months ended June 30, 2020 and 2019, respectively, comprise the following:

	Three months ended June 30,					Six months ended June 30,
	2020			2019		2020			2019
Base rents	$	22,781,000		$	26,352,000	$	48,543,000		$	52,753,000
Expense recoveries		6,328,000			7,950,000		14,883,000			17,144,000
Percentage rent		33,000			265,000		329,000			447,000
Straight-line rents		(988,000	)		111,000		(945,000	)		335,000
Amortization of intangible lease liabilities, net		307,000			631,000		766,000			1,222,000
Total rents	$	28,461,000		$	35,309,000	$	63,576,000		$	71,901,000

The Company reviews the collectability of charges under its tenant operating leases on a regular basis, taking into consideration changes in factors such as the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the area where the property is located. During 2020, the Company’s assessment has specifically included the impact of the COVID-19 pandemic, which represents a material risk to collectability. In the event that collectability with respect to any tenant changes the Company recognizes an adjustment to rental income. The Company’s review of collectability of charges under its operating leases includes any accrued rental revenues related to the straight-line method of reporting rental revenue. During the quarter ended June 30, 2020, the Company identified various tenants where collection was no longer considered probable. The determination to record revenue on a cash basis and write off any outstanding straight-line receivable from these various tenants reduced net income $1.2 million and $1.2 million for the three and six months ended June 30, 2020, respectively. In addition, during the three months ended June 30, 2020, $4.0 million of billed charges, consisting of rent and tenant reimbursements, were unpaid, and based on the Company’s determination to record revenue on a cash basis for these tenants, the $4.0 million was not recorded as revenue for the three months ended June 30, 2020.