Continuance. Except as otherwise provided in this section, the lawful use of any sign existing at the date of the adoption of this chapter, which is not a portable or temporary sign as defined in subsection 22-610.1 above, may be continued although such sign does not conform to this chapter, provided that no nonconforming signs shall be enlarged, extended, increased or changed in material, character, location, illumination or message. Signs of a portable or temporary nature existing as of the date of the adoption of this chapter shall be subject to the provisions of this chapter and as such same shall be removed upon this chapter becoming law.

Abandonment. A nonconforming sign shall be presumed to be abandoned when there occurs a cessation of any use or activity to which the sign is accessory pursuant to subsection 22-610.8, paragraph f.

Restoration. In the event any nonconforming sign shall be partially destroyed by reason of windstorm, fire, explosion, or act of God, such sign may be restored or repaired, provided there is no change in size or location. In the event a nonconforming sign shall be totally destroyed by reason of any of the above elements, said sign shall not be rebuilt or reconstructed except in conformance with the provisions of this chapter. Totally destroyed for purposes of this paragraph shall be defined as a sign which is more than 50% destroyed.

Reversion. No nonconforming sign shall, once it has become a conforming sign, be changed or altered in any manner so that it again becomes a nonconforming sign.