Wash. Rev. Code § 53.04.120
Property may be acquired and owned by any port district, at least one boundary of which property is contiguous to or within one-quarter air mile of such port district and is also located in an adjacent port district, and such property may be transferred to the owning port district upon unanimous resolution of the boards of commissioners of both port districts authorizing the same. The resolution of the port district within which such property is located shall be a resolution to permit the acquisition and to make the transfer, while the resolution of the port district which owns the property shall be a resolution to acquire and own the property and to accept the transferred property. Upon the filing of both official resolutions with the legislative authority and the auditor of the county or counties within which such port districts lie, together with maps showing in reasonable detail the boundary changes made, such acquisition and ownership shall be lawful and such transfer shall be effective and the commissioners of the port district acquiring, owning and receiving such property shall have jurisdiction over the whole of said enlarged port district to the same extent, and with like power and authority, as though the additional territory had been owned by and originally embraced within the boundaries of the port district.
RCW 53.04.120
Validity-Ratification-1979 c 72: "Any purchase or other acquisition of such property by any port district which occurred prior to the enactment of this 1979 amendatory act is hereby confirmed and ratified and shall not be deemed to have been ultra vires." [ 1979 c 72 s 2.]
Severability-1979 c 72: "If any provision of this 1979 amendatory act or its application to any person or circumstance is held invalid, the remainder of the act or the application of the provision to other persons or circumstances is not affected." [ 1979 c 72 s 4.]