On January 10, 2018, Tocagen Inc. entered into a lease with AP3-SD1 Campus Point LLC (Landlord) for the lease of approximately 38,849 square feet of rentable area of the building located at 4242 Campus Point Court, San Diego, California (the premises). The commencement date of the lease will be the earlier of (a) June 1, 2018, or (b) substantial completion of tenant improvements, or (c) the date the company begins conducting business operations in all or any portion of the premises. The company expects to use the premises as its new principal executive offices and for general office, research and development, lab and pilot manufacturing uses. The term of the lease (the initial term) is eight years and the company has one option to extend the lease for a period of five additional years. The aggregate base rent due over the initial term under the terms of the lease is approximately $16.7 million (without giving effect to certain rent abatement terms). The company will also be responsible for the payment of additional rent to cover the company's share of the annual operating expenses of the building, the annual tax expenses of the building and the annual utilities costs for the building. The company expects that the additional rent during the initial term will be approximately $3.4 million. The company also expects to pay for leasehold improvements in excess of the tenant improvement allowance.