California Code, Health and Safety Code - HSC § 18611

(a) Factory-built housing bearing an insignia of approval pursuant to Section 19980, manufactured homes as defined in Section 18007, mobilehomes as defined in Section 18008, or multiunit manufactured housing as defined in Section 18008.7 may be affixed to a foundation system within a mobilehome park, if the installation conforms to the rules of the mobilehome park, the installation is approved pursuant to Section 19992, or in the case of manufactured homes, mobilehomes, or multiunit manufactured housing the installation is in accordance with Section 18551, and no single structure exceeds two stories in height. Any factory-built housing, manufactured homes, mobilehomes, or multiunit manufactured housing included in a mobilehome park pursuant to this section shall be located on lots especially designated for that purpose in accordance with the rules of the mobilehome park.

(b) This section applies only to mobilehome parks (1) where the permit to construct the park is issued on or after January 1, 1982, and (2) that are additionally granted a zone designation or conditional use permit that authorizes permanent occupancies of the type and to the extent established pursuant to this section.

(c) Nothing in this section shall be construed to create an exemption from the requirements of Division 2 (commencing with Section 66410) of Title 7 of the Government Code.