Any sign now or hereafter existing which no longer advertises a bona fide business conducted or a product sold shall be taken down and removed by the owner, agent or person having the beneficial use of the building or structure upon which such sign may be found within ten days after written notification from the city manager and, upon failure to comply with such notice within the time specified in such order, the city manager is authorized to cause removal by the owner of the building or structure to which the sign is attached. (Amended during 1992 codification: prior code § 21-1-14)