4. Leases

The components of CRA’s lease expenses, which are included in the condensed consolidated income statement, are as follows (in thousands):


	Year Ended
	December 28, 2019
	(52 weeks)
Operating lease cost	$	15,731
Short-term lease cost		511
Variable lease cost		4,461
Total lease cost	$	20,703

Base rent expense was approximately $13.2 million and $12.1 million in fiscal 2018 and fiscal 2017, respectively.

The following table presents summary information for CRA’s lease terms and discount rates for its operating leases:


	December 28, 2019
Weighted average remaining lease term—operating leases	9.6 years
Weighted average discount rate—operating leases	3.7	%

At December 28, 2019, CRA had the following maturities of lease liabilities related to office space and equipment, all of which are under non-cancellable operating leases (in thousands):


	Operating Lease
Fiscal Year	Commitments
2020	$	17,973
2021		19,866
2022		20,030
2023		20,258
2024		20,302
Thereafter		96,225
Total lease payments		194,654
Less: imputed interest		(35,256)
Total	$	159,398

As of December 28, 2019, CRA had an additional operating lease for office space that has not yet commenced that has minimum rental commitments of $2.8 million. This operating leases will commence in fiscal year 2020 and have a lease term of five years, subject to certain extension options.