Wash. Rev. Code § 79.24.410
The state capitol committee may accept such grant on behalf of the state. Upon receipt from the city of Olympia of the conveyance authorized by RCW 79.24.400, the state capitol committee may lease the premises thereby conveyed, to any person, firm, or corporation for the purpose of constructing, operating and maintaining a garage and parking facility underneath the surface of said property.
The lease shall be for a term of not to exceed twenty-five years and by its terms shall require the lessee to restore and maintain the condition of the surface of the property so as to be available and suitable for use as a public park. The lease shall further provide that all improvements to the property shall become the property of the state upon termination of the lease, and may provide such further terms as the capitol committee may deem to be advantageous.
RCW 79.24.410