California Code, Civil Code - CIV § 798.70

(a) A homeowner, an heir, joint tenant, or personal representative of the estate who gains ownership of a mobilehome in the mobilehome park through the death of the owner of the mobilehome who was a homeowner at the time of his or her death, or the agent of any such person, may advertise the sale or exchange of his or her mobilehome, or, if not prohibited by the terms of an agreement with the management, may advertise the rental of his or her mobilehome, by displaying one sign in the window of the mobilehome, or by one sign posted on the side of the mobilehome facing the street, or by one sign in front of the mobilehome facing the street, stating that the mobilehome is for sale or exchange or, if not prohibited, for rent by the owner of the mobilehome or his or her agent.  Any such person also may display one sign conforming to these requirements indicating that the mobilehome is on display for an “open house,” if allowed by the park.  The park may allow open houses and may establish reasonable rules or regulations governing how an open house may be conducted, including rules regarding the number of houses allowed to be open at one time, hours, and parking.  The sign shall state the name, address, and telephone number of the owner of the mobilehome or his or her agent and the sign face shall not exceed 24 inches in width and 36 inches in height.  Signs posted in front of a mobilehome pursuant to this section may be of an H-frame, A-frame, L-frame, or generally accepted yard-arm type design with the sign face perpendicular to, but not extending into, the street.  Management may require the use of a step-in L-frame sign.  Homeowners may attach to the sign or their mobilehome tubes or holders for leaflets that provide information on the mobilehome for sale, exchange, or rent.

(b) This section shall become operative on July 1, 2016.