Our headquarters are located at 121 Seaport Boulevard, Boston, Massachusetts (the Boston lease). The Boston lease is for approximately 250,000 square feet and runs from January 1, 2019 through June 30, 2037. Base rent for the first year of the lease is $11.0 million and will increase by $1 per square foot per year thereafter ($0.3 million per year). Base rent first became payable on July 1, 2020. In addition to the base rent, we are required to pay our pro rata portions of building operating costs and real estate taxes (together, “Additional Rent”). Annual Additional Rent is estimated to be approximately $7.1 million. The lease provides for $25 million in landlord funding for leasehold improvements ($100 per square foot). The leasehold improvement funding provision was fully utilized by us and was reflected as a derecognition adjustment to the right-of-use asset.

The components of lease cost reflected in the Consolidated Statement of Operations for the year ended September 30, 2020 were as follows:

(in thousands)	Year ended September 30, 2020
Operating lease cost	$	38,687
Short-term lease cost		4,430
Variable lease cost		5,247
Sublease income		(4,267	)
Total lease cost	$	44,097

Supplemental cash flow and right-of use assets information for the year ended September 30, 2020 was as follows:

(in thousands)	Year ended September 30, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	38,553
Right-of-use assets obtained in exchange for new operating lease liabilities	$	7,632
Right-of-use assets obtained in exchange for new financing lease liabilities	$	1,500

Supplemental balance sheet information related to the leases as of September 30, 2020 was as follows:

	As of September 30, 2020
Weighted-average remaining lease term - operating leases	12.41 years
Weighted-average remaining lease term - financing leases	5 years
Weighted-average discount rate - operating leases		5.5	%
Weighted-average discount rate - financing leases		3.0	%

(in thousands)	Operating Leases
2021	$	44,710
2022		30,993
2023		22,326
2024		19,686
2025		17,051
Thereafter		170,303
Total future lease payments		305,069
Less: imputed interest		(90,046	)
Total	$	215,023

Under the prior lease standard (ASC 840), as of September 30, 2019 future minimum lease payments under non-cancellable operating leases were as follows:

(in thousands)	Operating Leases
2020	$	31,868
2021		33,094
2022		25,624
2023		19,279
2024		16,909
Thereafter		186,037
Total minimum lease payments	$	312,811

As of September 30, 2020, we have net liabilities of $11.3 million related to excess facilities (compared to $16.5 million at September 30, 2019), representing $3.2 million of right-of-use assets and $14.5 million of lease obligations, of which $9.7 million is classified as short term and $4.8 million is classified as long term.

In determining the amount of right-of-use assets for restructured facilities, we are required to estimate such factors as future vacancy rates, the time required to sublet properties, and sublease rates. Updates to these estimates may result in revisions to the value of right-of-use assets recorded. The amounts recorded are based on the net present value of estimated sublease income. As of September 30, 2020, the right-of-use assets for exited facilities reflect discounted committed sublease income of approximately $2.8 million and uncommitted sublease income of approximately $0.4 million. As a result of changes in our sublease income assumptions and an incremental obligation to exit a portion of our former headquarters facility early, in the year ended September 30, 2020, we recorded a facility impairment charge of $4.4 million. In addition, in the year ended September 30, 2020, we exited the former Onshape headquarters lease and recorded a related $1.2 million impairment charge.

In the year ended September 30, 2020, we made payments of $10.5 million related to lease costs for exited facilities.