Business and Professions Code § 10018.08

“Single-family residential property” or “Single-family residential real property” means: (a) real property improved with one to four dwelling units, including any leasehold exceeding one year’s duration of such, (b) a unit in a residential stock cooperative, condominium, or planned unit development, or (c) a mobilehome or manufactured home when offered for sale or sold through a real estate broker pursuant to Section 10131.6.