No nonconforming use shall, if once changed into a conforming
use, be changed back again to a nonconforming use.
Unless a use variance has been granted by the Board of Appeals,
a nonconforming use shall not be reconstructed or structurally altered
to an extent which would enlarge or expand its square footage and
increase gross density greater than was occupied at the time this
chapter, or any amendment hereto, becomes effective.
Whenever the boundaries of a district shall be changed so as
to transfer an area from one zoning district to another of a different
classification, the foregoing provisions shall also apply to any nonconforming
uses existing therein or created thereby.
Except as may be otherwise stated in this Article
IV, nothing herein contained shall require any changes in plans, construction or designated use of a building structure or sign for which a permit has been duly issued and the construction of which shall have been diligently prosecuted within three months of the date of such permit, and the ground story framework of which, including the second tier of beams, shall have been completed within six months of the date of the permit.
Existing mobile home parks. Other provisions of this Article
IV, to the contrary notwithstanding, existing mobile home parks which are not in compliance with the provisions of this chapter may be continued only in accordance with the provisions of §
308-46B(12)(g) herein.