Any person who owns or leases a sign shall remove the sign within 30 days after notification by the Zoning Administrator when either the business it advertises has discontinued business in the City, or the business it advertises is no longer conducted in or upon the premises on which the sign is located. If the person who owns or leases the sign fails to remove it as provided in this section, the Zoning Administrator shall give the owner of the building, structure or premises on which the sign is located, 30 days' written notice to remove it. If the owner of the building, structure or premises on which the sign is located fails to remove the sign within 30 days after receipt of written notice from the Zoning Administrator, the Zoning Administrator may remove the sign or cause it to be removed. The following signs need not be removed in accordance with this section:
A. Billboards, where a person has merely leased or contracted advertising space thereon.
B. Signs which the successor to a person's business location or business agrees to maintain, as provided in this Part.