We lease office, retail and storage space to tenants, primarily under non-cancellable operating leases, which have terms generally ranging from five to fifteen years. Most of our leases provide tenants with extension options at either fixed or market rates and few of our leases provide tenants with options to early terminate, but such options generally impose an economic penalty on the tenant upon exercising. Our leases provide for (i) fixed payments of cash rents, which represents revenue each tenant pays in accordance with the terms of its respective lease and that is recognized on a straight-line basis over the non-cancellable term of the lease, and includes the effects of rent steps and rent abatements under the leases and (ii) variable payments of tenant reimbursements, which are recoveries of all or a portion of the operating expenses and real estate taxes of the property and is recognized in the same period as the expenses are incurred.

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
(Amounts in thousands)	2020			2019		2020			2019
Rental revenues:
Fixed	$	153,065	⁽¹⁾	$	163,123	$	467,609	⁽¹⁾	$	484,587
Variable		12,355			17,992		37,225			45,913
Total rental revenues	$	165,420		$	181,115	$	504,834		$	530,500

The following table is a schedule of future undiscounted cash flows under non-cancelable operating leases in effect as of September 30, 2020, for the three-month period from October 1, 2020 through December 31, 2020 and each of the five succeeding years commencing January 1, 2021.

(Amounts in thousands)
2020	$	158,252
2021		638,462
2022		627,424
2023		603,824
2024		576,766
2025		516,604
Thereafter		2,352,959
Total	$	5,474,291