Cal. Gov. Code § 65852.7

A mobilehome park, as defined in Section 18214 of the Health and Safety Code, shall be deemed a permitted land use on all land planned and zoned for residential land use as designated by the applicable general plan; provided, however, that a city, county, or a city and county may require a use permit. For purposes of this section, “mobilehome park” also means a mobilehome development constructed according to the requirements of Part 2.1 (commencing with Section 18200) of Division 13 of the Health and Safety Code, and intended for use and sale as a mobilehome condominium or cooperative park, or as a mobilehome planned unit development. The provisions of this section shall apply to a city, including a charter city, a county, or a city and county.