Cal. Civ. Code § 66.1011

66.1011 Local equal opportunities.
(1) Declaration of policy. The right of all persons to have equal opportunities for housing regardless of their sex, race, color, disability, as defined in s. 106.50 (1m) (g), sexual orientation, as defined in s. 111.32 (13m), religion, national origin, marital status, family status, as defined in s. 106.50 (1m) (k), status as a victim of domestic abuse, sexual assault, or stalking, as defined in s. 106.50 (1m) (u), lawful source of income, age, or ancestry is a matter both of statewide concern under ss. 101.132 and 106.50 and also of local interest under this section and s. 66.0125. The enactment of ss. 101.132 and 106.50 by the legislature does not preempt the subject matter of equal opportunities in housing from consideration by political subdivisions, and does not exempt political subdivisions from their duty, nor deprive them of their right, to enact ordinances that prohibit discrimination in any type of housing solely on the basis of an individual being a member of a protected class.
(1m) Definitions. In this section:
(a) “Aggrieved person” has the meaning given in s. 106.50 (1m) (b).
(b) “Complainant” has the meaning given in s. 106.50 (1m) (c).
(c) “Discriminate” has the meaning given in s. 106.50 (1m) (h).
(d) “Member of a protected class” has the meaning given in s. 106.50 (1m) (nm).
(e) “Political subdivision” means a city, village, town or county.
(2) Antidiscrimination housing ordinances. Political subdivisions may enact ordinances prohibiting discrimination in housing within their respective boundaries solely on the basis of an individual being a member of a protected class. An ordinance may be similar to ss. 101.132 and 106.50 or may be more inclusive in its terms or in respect to the different types of housing subject to its provisions. An ordinance establishing a forfeiture as a penalty for violation may not be for an amount that is less than the statutory forfeitures under s. 106.50 (6) (h). An ordinance may permit a complainant, aggrieved person or respondent to elect to remove the action to circuit court after a finding has been made that there is reasonable cause to believe that a violation of the ordinance has occurred. An ordinance may authorize the political subdivision, at any time after a complaint has been filed alleging an ordinance violation, to file a complaint in circuit court seeking a temporary injunction or restraining order pending final disposition of the complaint.
(3) Contingency restriction. No political subdivision may enact an ordinance under sub. (2) that contains a provision making its effective date or the operation of any of its provisions contingent on the enactment of an ordinance on the same or similar subject matter by one or more other political subdivisions.