California Code, Civil Code - CIV § 51.5

(a) No business establishment of any kind whatsoever shall discriminate against, boycott or blacklist, or refuse to buy from, contract with, sell to, or trade with any person in this state on account of any characteristic listed or defined in subdivision (b) or (e) of Section 51, or of the person's partners, members, stockholders, directors, officers, managers, superintendents, agents, employees, business associates, suppliers, or customers, because the person is perceived to have one or more of those characteristics, or because the person is associated with a person who has, or is perceived to have, any of those characteristics.

(b) As used in this section, “person” includes any person, firm, association, organization, partnership, business trust, corporation, limited liability company, or company.

(c) This section shall not be construed to require any construction, alteration, repair, structural or otherwise, or modification of any sort whatsoever, beyond that construction, alteration, repair, or modification that is otherwise required by other provisions of law, to any new or existing establishment, facility, building, improvement, or any other structure, nor shall this section be construed to augment, restrict, or alter in any way the authority of the State Architect to require construction, alteration, repair, or modifications that the State Architect otherwise possesses pursuant to other laws.