Cal. Civ. Code § 910-2-2-4

Sec. 4. (a) It shall be unlawful:
(1) to restrict or attempt to restrict the choices of a person by word or conduct in connection with seeking, negotiating for, buying, or renting a dwelling so as to perpetuate, or tend to perpetuate, segregated housing patterns; or
(2) to discourage or obstruct choices in a community, neighborhood, or development;
because of race, color, religion, sex, handicap, familial status, or national origin.

(b) It shall be unlawful to engage in any conduct relating to the provision of housing or of services and facilities in connection therewith that otherwise makes unavailable or denies dwellings to any person because of race, color, religion, sex, handicap, familial status, or national origin.
(c) Prohibited actions under section 1 of this rule, which are generally referred to as unlawful steering practices, include, but are not limited to, the following:
(1) Discouraging any person from inspecting, purchasing, or renting a dwelling because of race, color, religion, sex, handicap, familial status, or national origin or because of the race, color, religion, sex, handicap, familial status, or national origin of any person in a community, neighborhood, or development.
(2) Discouraging the purchase or rental of a dwelling because of race, color, religion, sex, handicap, familial status, or national origin by exaggerating drawbacks or failing to inform any person of desirable features of a dwelling or of a community, neighborhood, or development.
(3) Communicating to any prospective purchaser that he or she would not be comfortable or compatible with existing residents of a community, neighborhood, or development because of race, color, religion, sex, handicap, familial status, or national origin.
(4) Assigning any person to a particular section of a community, neighborhood, or development, or to a particular floor of a building, because of race, color, religion, sex, handicap, familial status, or national origin.

(d) Prohibited activities relating to dwellings under section 2 of this rule include, but are not limited to, the following:
(1) Discharging or taking other adverse action against an employee, broker, or agent because he or she refused to participate in a discriminatory housing practice.
(2) Employing codes or other devices to segregate or reject applicants, purchasers, or renters:
(A) refusing to take or to show listings of dwellings in certain areas because of race, color, religion, sex, handicap, familial status, or national origin; or
(B) refusing to deal with certain brokers or agents because they or one (1) or more of their clients are of a particular race, color, religion, sex, handicap, familial status, or national origin.

(3) Denying or delaying processing an application made by a purchaser or renter or refusing to approve such a person for occupancy in a cooperative or condominium dwelling because of race, color, religion, sex, handicap, familial status, or national origin.
(4) Refusing to provide municipal services or property or hazard insurance for dwellings or providing such services or insurance differently because of race, color, religion, sex, handicap, familial status, or national origin.