California Code, Health and Safety Code - HSC § 50099.5

“Residential structure,” for the purpose of the California Housing Finance Agency, means any existing structure of one to four units or any work or undertaking of one to four dwelling units of new construction or rehabilitation for the provision of housing financed pursuant to the provisions of this division for the primary purpose of providing decent, safe, and sanitary housing for persons and families of low or moderate income. “Residential structure” may include any buildings, land, equipment, facilities, or other real or personal property which the agency determines to be necessary or convenient in connection with the provision of housing pursuant to this division, and including, but not limited to, streets, sewers, utilities, parks, site preparation, landscaping, and other nonhousing facilities including, but not limited to, administrative, community, health, recreational, educational, commercial, and child care facilities which the agency determines are an integral part of a residential neighborhood.