Duration of Permit. If the work authorized under a sign permit has not been completed within six months after the date of issuance, the permit shall become null and void and a new application for a sign permit shall be required.
b.
Maintenance of Signs.
1.
All visible portions of a sign and its supporting structure shall be maintained in a safe condition, and neat appearance according to the following:
(a)
If the sign is lighted, all lights shall be maintained in working order and functioning in a safe manner.
(b)
If the sign is painted, the painted surface shall be kept in good condition.
(c)
Every sign shall be kept in such manner as to constitute a complete or whole sign.
2.
Lawfully erected nonconforming signs may suffer only ordinary and customary repairs and maintenance. As provided in § 30-8.12, a lawfully-erected nonconforming sign shall not be structurally altered except in full conformance with this section.