In April 2019, the Company entered into a lease for its corporate headquarters in Pasadena, California. The 91 month office building lease between the Company and 177 Colorado Owner, LLC is for approximately 24,000 square feet of office space located at 177 E. Colorado Blvd, Pasadena, California. The increased capacity of this new office space compared to the Company’s prior corporate headquarters will accommodate increased personnel as the Company’s pipeline of drug candidates expands and moves

closer to market. Lease payments began on September 30, 2019 and are estimated to total approximately $8.7 million over the term. The lease expires on April 30, 2027. The Company has paid approximately $3.5 million for leasehold improvements, net of tenant improvement allowances. The lease contains an option to renew for one term of five years. The exercise of this option was not determined to be reasonably certain and thus was not included in lease liabilities on the Company’s Consolidated Balance Sheet at September 30, 2021. On October 23, 2020, the Company entered into a lease expansion to add an additional approximately 24,000 square feet of office space at the same location for its corporate headquarters. Lease payments for the expansion began in July 2021 and the lease for the expansion expires in April 2027. The lease payments for the expansion are expected to total $6.9 million. The Company has paid approximately $4.0 million of leasehold improvements, net of tenant improvement allowances, for the lease expansion. The increased capacity of this additional office space compared to the Company’s current corporate headquarters is intended to accommodate increased personnel as the Company’s pipeline of drug candidates continues to expand and move closer to market.

In January 2016, the Company entered into a lease for its research facility in Madison, Wisconsin. The lease was for approximately 60,000 square feet of office and laboratory space and had an expiration date of September 30, 2026. The lease was amended in January 2019 and May 2020 to expand the rentable square feet by an additional 40,000 square feet and to extend the lease expiration date to September 30, 2031. Lease payments are estimated to total approximately $26.2 million for the term. The Company incurred approximately $11.0 million of leasehold improvements for the additional 40,000 square feet, net of tenant improvement allowances. The lease contains two options to renew for two terms of five years. The exercise of these options were not determined to be reasonably certain and thus was not included in lease liabilities on the Company’s Consolidated Balance Sheet at September 30, 2021. In November 2020 and December 2020, the Company entered into amendments to expand the rentable square space by an additional 10,743 square feet and these amendments added a total of approximately $1.2 million of lease payments for the remainder of the term.

In March 2020, the Company entered into a sublease agreement (the “Sublease”) with Halozyme, Inc. for additional research and development facility space in San Diego, California. The Sublease provides additional space needed to accommodate the recent growth of the Company’s personnel and discovery efforts. The sublease is for approximately 21,000 rentable square feet. The term of the Sublease commenced on April 1, 2020 and will end on January 14, 2023. Sublease payments are estimated to total approximately $2.0 million over the term.

Operating lease cost during the years ended September 30, 2021, 2020 and 2019 was $5.1 million, $2.4 million and $1.3 million respectively. Variable lease costs during the year ended September 30, 2021, 2020, and 2019 were $0.8 million, $0.8 million and $0.5 million respectively. There was no short-term lease cost during the years ended September 30, 2021, 2020 and 2019.

The following table presents maturities of operating lease liabilities on an undiscounted basis as of September 30, 2021:

	(in thousands)
2022		4,708
2023		4,786
2024		4,621
2025		4,749
2026		5,050
2027 and thereafter		13,200
Total	$	37,114
Less imputed interest	$	(11,569	)
Total operating lease liabilities (includes current portion)	$	25,545

Cash paid for the amounts included in the measurement of the operating lease liabilities on the Company’s Consolidated Balance Sheet and included in Other changes in operating assets and liabilities within cash flows from operating activities on the Company’s Consolidated Statements of Cash Flow for the years ended September 30, 2021, 2020 and 2019 were $3.1 million, $1.8 million and $1.3 million, respectively. The weighted-average remaining lease term and weighted-average discount rate for all leases as of September 30, 2021 was 8 years and 8.5%, respectively.