Exempts the following from the definition of "sale" with regard to real estate excise taxes: A qualified transfer or residential property by a legal representative of a person with developmental disabilities to a nonprofit organization that provides residential supported living for persons with developmental disabilities subject to certain conditions.

Requires the Washington state developmental disabilities council to develop and make available model transfer agreements that legally transfer a residential property from a parent or guardian of a developmentally disabled person to a nonprofit or foundation that provides residential supported living services to persons with developmental disabilities.

Includes the following as an activity that is eligible for assistance from the housing trust fund and other legislative appropriations: Remodeling and improvements as required to meet building code, licensing requirements, or functionality to residential properties owned and operated by a nonprofit or foundation that was transferred by the parent of a child with developmental disabilities.