Cal. Bus. & Prof. Code § 5272.1
(b) This section applies to advertising displays only if the multimodal transit facility meets the following requirements:
(c) To advertise any products, goods, or services on an advertising display pursuant to this section, all of the following shall apply:
(d) Any advertising display erected pursuant to this section shall be lawful only if authorized by, or in accordance with, an ordinance, including, but not limited to, a specific plan or sign district, adopted by the city, county, or city and county, as applicable, that regulates advertising displays by either identifying the specific displays or by establishing regulations that include, at a minimum, all of the following: