Wash. Rev. Code § 27.34.200
The legislature hereby finds that the promotion, enhancement, perpetuation, and use of structures, sites, districts, buildings, and objects of historic, archaeological, architectural, and cultural significance is desirable in the interest of the public pride and general welfare of the people of the state; and the legislature further finds that the economic, cultural, and aesthetic standing of the state can be maintained and enhanced by protecting the heritage of the state and by preventing the destruction or defacement of these assets; therefore, it is hereby declared by the legislature to be the public policy and in the public interest of the state to designate, preserve, protect, enhance, and perpetuate those structures, sites, districts, buildings, and objects which reflect outstanding elements of the state's historic, archaeological, architectural, or cultural heritage, for the inspiration and enrichment of the citizens of the state.
RCW 27.34.200