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 (10) days after written notification from the Zoning Administrator, and, upon failure to comply with such notice within the time specified in such order, the Zoning Administrator is authorized to cause removal of such sign, and any expenses incident thereto shall be paid by the owner of the building or structure to which such sign is attached, pursuant to the same procedure set out in Section 20.150.