(a) No person who is the owner, user or custodian of any kind of sign shall permit such sign or its supports to be suspended over public sidewalks or public property longer than thirty days after the discontinuance of the business at such location, or of such purpose which the sign had advertised.
(b) If the owner, user or custodian of a sign suspended over public sidewalks or public property fails to remove such sign within the allotted thirty days after such business or purpose has been discontinued, then the owner of the building or lessee of that part of the building or property, to which such sign is attached, shall immediately remove such sign.
(1964 Code §701.24)