Wash. Rev. Code § 79.24.650
The state capitol committee shall provide for the construction, remodeling, and furnishing of capitol office buildings, parking facilities, governor's mansion, and such other buildings and facilities as are determined by the state capitol committee to be necessary to provide space for the legislature by way of offices, committee rooms, hearing rooms, and work rooms, and to provide executive office space and housing for the governor, and to provide executive office space for other elective officials and such other state agencies as may be necessary, and to pay for all costs and expenses in issuing the bonds and to pay interest thereon during construction of the facilities for which the bonds were issued and six months thereafter.
RCW 79.24.650