Wash. Rev. Code § 59.20 § 59.20.325

(1) An owner shall give written notice of an opportunity to compete to purchase indicating the owner's interest in selling the manufactured/mobile home community before the owner markets the manufactured/mobile home community for sale or includes the sale of the manufactured/mobile home community in a multiple listing, and when the owner receives an offer to purchase that the owner intends to consider.
(2) The owner shall give the notice in subsection (1) of this section to:
(a) Each tenant of the manufactured/mobile home community;
(b) The officers of any known qualified tenant organization;
(c) The department of commerce;
(d) The local government within whose jurisdiction all or part of the manufactured/mobile home community exists;
(e) Any housing authority within whose jurisdiction all or part of the manufactured/mobile home community exists; and
(f) The Washington state housing finance commission.
(3) The notice required in subsection (1) of this section must include:
(a) The date that the notice was served per RCW 59.20.150 to all tenants referenced in subsection (2)(a) of this section and distributed to all recipients set forth in subsection (2)(b) through (f) of this section;
(b) A statement that the owner is considering selling the manufactured/mobile home community or the property on which it sits;
(c) A statement that the tenants, through a qualified tenant organization representing a majority of the tenants in the community, based on home sites, or an eligible organization, have an opportunity to compete to purchase the manufactured/mobile home community;
(d) A statement that in order to compete to purchase the manufactured/mobile home community, within 70 days after the certified mailing or personal delivery date stated in accordance with (a) of this subsection of the notice of the owner's interest in selling the manufactured/mobile home community, the tenants must form or identify a single qualified tenant organization for the purpose of purchasing the manufactured/mobile home community and notify the owner in writing of:
(i) The tenants' interest in competing to purchase the manufactured/mobile home community; and
(ii) The name and contact information of the representative or representatives of the qualified tenant organization with whom the owner may communicate about the purchase; and
(e) A statement that information about purchasing a manufactured/mobile home community is available from the department of commerce.
(4) The representative or representatives of the tenants committee will be able to request park operating expenses from the owner within a 20-day information period following delivery of the qualified tenant organization's notice to the owner indicating interest in competing to purchase the manufactured/mobile home community.
(5) An eligible organization may also compete to purchase and is subject to the same time constraints and applicable conditions as a qualified tenant organization.
(6) Electronic delivery of the notice of opportunity to compete to purchase is acceptable to:
(a) The department of commerce;
(b) The local government within whose jurisdiction all or part of the manufactured/mobile home community exists;
(c) Any housing authority within whose jurisdiction all or part of the manufactured/mobile home community exists; and
(d) The Washington state housing finance commission.
(7) Delivery of the notice of opportunity to compete to purchase to the department of commerce must include one copy of the notice as sent to each tenant of the manufactured/mobile home community.
(8) Notices sent under subsection (2)(c) through (f) of this section must be sent within 10 days of notices sent under subsection (2)(a) and (b) of this section.