Cal. Penal Code § 26383

Paragraph (1) of subdivision (a) of Section 26350 does not apply to, or affect, the open carrying of an unloaded handgun by a person when done within a place of business, a place of residence, or on private property, if done with the permission of a person who, by virtue of subdivision (a) of Section 25605, may carry openly an unloaded handgun within that place of business, place of residence, or on that private property owned or lawfully possessed by that person.