We lease office, retail and storage space to tenants, primarily under non-cancellable operating leases which generally have terms 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. Rental revenue is recognized in accordance with ASC Topic 842, Leases, and includes (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, (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, (iii) amortization of acquired above and below-market leases, net and (iv) lease termination income.


	For the Three Months Ended March 31,
(Amounts in thousands)	2022		2021
Rental revenue:
Fixed	$	154,777	$	160,629
Variable		15,145		12,517
Total rental revenue	$	169,922	$	173,146

The following table is a schedule of future undiscounted cash flows under non-cancellable operating leases in effect as of March 31, 2022, for the nine-month period from April 1, 2022 through December 31, 2022, and each of the five succeeding years and thereafter commencing January 1, 2023.

(Amounts in thousands)
2022	$	477,510
2023		628,122
2024		621,054
2025		566,419
2026		470,246
2027		402,583
Thereafter		1,957,941
Total	$	5,123,875