California Code, Civil Code - CIV § 798.45

(a) Notwithstanding Section 798.17, “new construction,” as defined in subdivision (a) of Section 798.7, shall be exempt from any ordinance, rule, regulation, or initiative measure adopted by any city, county, or city and county, that establishes a maximum amount that a landlord may charge a tenant for rent, for a period of 15 years from the date upon which the space is initially held out for rent, as defined in subdivision (a) of Section 798.7.

(b) Notwithstanding Section 798.17, “new mobilehome park construction,” as defined in subdivision (b) of Section 798.7, shall be exempt from any ordinance, rule, regulation, or initiative measure adopted by any city, county, or city and county, that establishes a maximum amount that a landlord may charge a tenant for rent for a period of 15 years from the date upon which 50 percent of the spaces in the new mobilehome park are initially held out for rent measured from the date of issuance of a permit or certificate of occupancy for that space by the enforcement agency in accordance with Section 18551 or 18613 of the Health and Safety Code.