The use of any building, structure, or land which is made nonconforming by reason of the enactment of this Part 1, or which shall be made nonconforming by reason of a subsequent amendment, may be continued, subject to the following provisions:
A.
Repairs and alterations. A nonconforming building or structure may be repaired, altered, improved, or reconstructed, provided that the number of square feet of floor area devoted to the nonconforming use is not increased, except as provided hereinafter in this section.
B.
Rebuilding. A nonconforming building or structure damaged or destroyed by fire, explosion, or act of God may be rebuilt, provided that the rebuilding is begun within one year of the disaster, and provided that the number of square feet of floor area devoted to the nonconforming use is not increased, except as provided hereinafter in this section.
C.
Extension of use. A nonconforming use of a building or structure shall not be extended, nor shall a nonconforming use of a part of a building or structure be extended to other parts of the building or structure, unless those parts were manifestly arranged or designed for such use prior to the enactment of this section or of any amendment making such use nonconforming, except as provided hereinafter in this section. A nonconforming open use of land may not be extended to any part of the remainder of the lot.
D.
Enlargement. The Board of Appeals may grant permission for the enlargement of any use made legally nonconforming by the district provisions of this Part 1. In reviewing all such applications for enlargement or replacement, the Board of Appeals shall use the criteria established herein for the consideration of special exceptions.
E.
Change in use. A nonconforming use of a building, structure, or land may be changed to another nonconforming use only when, in the opinion of the Board of Appeals, the new use is not more objectionable or detrimental to adjacent properties than the former use.