Wash. Rev. Code § 70.265.110
Any public hospital capital facility area may contract or join with any public hospital district, publicly owned hospital, nonprofit hospital, legal entity, or individual to acquire, own, operate, manage, or provide any hospital or other health care facilities or hospital services or other health care services to be used by individuals, districts, hospitals, or others, including providing health maintenance services. If a public hospital capital facility area chooses to contract or join with another party or parties pursuant to the provisions of this chapter, it may do so through establishing a nonprofit corporation, partnership, limited liability company, or other legal entity of its choosing in which the public hospital capital facility area and the other party or parties participate. The governing body of the legal entity must include representatives of the public hospital capital facility area, which representatives may include members of the public hospital district's board of commissioners. A public hospital capital facility area contracting or joining with another party pursuant to the provisions of this chapter may appropriate funds and may sell, lease, or otherwise provide property, personnel, and services to the legal entity established to carry out the contract or joint activity.
RCW 70.265.110