Cal. CIV § 799.1.5

A homeowner or resident, or an heir, joint tenant, or personal representative of the estate who gains ownership of a mobilehome through the death of the resident of the mobilehome who was a resident at the time of his or her death, or the agent of any of those persons, may advertise the sale or exchange of his or her mobilehome or, if not prohibited by the terms of an agreement with the management or ownership, may advertise the rental of his or her mobilehome by displaying a sign in the window of the mobilehome, or by a sign posted on the side of the mobilehome facing the street, or by a 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 a sign conforming to these requirements indicating that the mobilehome is on display for an “open house,” unless the park rules prohibit the display of an open house sign. The sign shall state the name, address, and telephone number of the owner of the mobilehome or his or her agent. The sign face may 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 or A-frame design with the sign face perpendicular to, but not extending into, the street. A homeowner or resident, or an heir, joint tenant, or personal representative of the estate who gains ownership of a mobilehome through the death of the resident of the mobilehome who was a resident at the time of his or her death, or the agent of any of those persons, may attach to the sign or their mobilehome tubes or holders for leaflets that provide information on the mobilehome for sale, exchange, or rent.