California Code, Business and Professions Code - BPC § 5491

Notwithstanding any provision of Chapter 2 (commencing with Section 5200), except as provided in this chapter, no on-premises advertising display which is used for any of the purposes set forth and conforming to Section 5490 shall be compelled to be removed or abated, and its customary maintenance, use, or repair shall not be limited, whether or not removal or limitation is required because of any ordinance or regulation of any city or county, without the payment of fair and just compensation.