Normal maintenance of a building, other structure or land containing a nonconforming use may be performed, including necessary nonstructural repairs and incidental alterations which do not extend or intensify the nonconforming use.
No structural alterations shall be made in such a building, other structure, or land containing a nonconforming use except as hereinafter provided or except in the following situations:
A. When the alteration is required by law.
B. When the alteration will actually result in eliminating the nonconforming use, i.e., the entire building, other structure or land shall thereafter be devoted to a conforming use, and will be in compliance with and conforming to all the regulations applicable to the district in which it is located.
C. The entire area of such structural alteration, enlargement, extension, or remodeling shall be in compliance with and conform to the requirements of the regulations applicable to the zoning district in which the building or other structure is located.
D. The building or other structure is remodeled structurally but without enlarging or extending the existing nonconforming building's exterior dimensions and without enlarging, extending, or increasing the degree of the nonconforming use in any manner. (1983 Code)