Constructed or altered on behalf of the United States means acquired by the United States through lease-purchase arrangement, constructed or altered for purchase by the United States, or constructed or altered for the use of the United States.
Primarily for use by able-bodied military personnel means expected to be occupied, used, or visited principally by military service personnel. Examples of buildings so intended are barracks, officers' quarters, and closed messes.
Privately owned residential structure means a single or multi-family dwelling not owned by a unit or subunit of Federal, state, or local government.
36 C.F.R. §1150.2