Wash. Rev. Code § 53.08.160
All port districts organized under the provisions of this act shall be, and they are hereby, authorized and empowered to initiate and carry on the necessary studies, investigations and surveys required for the proper development, improvement and utilization of all port properties, utilities and facilities, and for industrial development within the district when such agricultural and industrial development is carried out by a public agency, institution, or body for a public purpose, and to assemble and analyze the data thus obtained and to cooperate with the state of Washington, other port districts and other operators of terminal and transportation facilities for these purposes, and to make such expenditures as are necessary for said purposes, and for the proper promotion, advertising, improvement and development of such port properties, utilities and facilities: PROVIDED HOWEVER, That nothing in this section shall authorize a port district to develop its properties as an agricultural or dairy farm.
RCW 53.08.160