As used in this chapter the following words have the meanings indicated: “Authority” means any regional facility authority organized and existing pursuant to this chapter. “Board” means the board of directors of an authority. “Facility” means any structure or park, including real estate and improvements as applicable, for manufacturing, warehousing, distribution, office, or other industrial, residential, recreational or commercial purposes. A facility specifically includes structures or parks that are not owned by an authority or its member localities, but are subject to a cooperative arrangement pursuant to subdivision 13 of § 15.2-6405. “Governing bodies” means the boards of supervisors of counties and the councils of cities and towns which are members of an authority. “Member localities” means the counties, cities, and towns, or combination thereof, which are members of an authority. “Region” means the area within the boundaries of the member localities.