California Code, Business and Professions Code - BPC § 25503.22

(a) Nothing in this division shall prohibit the issuance, transfer, or renewal of any retail license to any person with respect to premises which are owned by, or operated by or on behalf of, the licensee, notwithstanding that a wholesaler licensed to sell alcoholic beverages in states other than California has an interest, directly or indirectly, in the premises, in the retail license or in the retail licensee, provided that each of the following conditions are met:

(b) The Legislature finds that it is necessary and proper to require a separation between manufacturing interests, wholesale interests, and retail interests in the production and distribution of alcoholic beverages in order to prevent suppliers from dominating local markets through vertical integration and to prevent excessive sales of alcoholic beverages produced by overly aggressive marketing techniques. The Legislature further finds that the exception established by this section to the general prohibition against tied interests must be limited to its expressed terms so as not to undermine the general prohibition, and intends that this section be construed accordingly.