No person shall maintain or permit to be maintained on any premises owned or controlled by him any sign which has been abandoned. Any such sign shall promptly be abated by the owner or such other person. Any sign which is located on property which becomes vacant and unoccupied for a period of three months or more, and any sign which was erected for an occupant or business unrelated to the present occupant or his business, and any sign which pertains to a time, event or purpose which no longer pertains, shall be presumed to have been abandoned.
(Ord. 3559 § 1 (part), 1984)