California Code, Health and Safety Code - HSC § 18613.3

An application for a permit for initial installation of a manufactured home or mobilehome shall be accompanied by a dimensioned plot plan of the lot on which the manufactured home or mobilehome will be installed. The park owner or operator shall sign the plot plan to certify that the dimensions of the lot are correct if the manufactured home or mobilehome is to be located in a park. The applicant shall provide a copy of the plot plan to the manufactured home or mobilehome owner, if the applicant is a contractor, and to the park owner or operator, if the manufactured home or mobilehome is to be located in a park.