No existing use, building or premises devoted to a nonconforming use shall be enlarged, extended, reconstructed, substituted or structurally altered, except when changed to a conforming use or when required to do so by law and as follows:
A. Restoration. Any nonconforming structure damaged to less than 80% of its previous existing area may be restored, reconstructed or used as before, provided that the area of such use, building or structure shall not exceed the area which existed prior to such damage. The Board of Adjustment shall determine the time period in which complete restoration shall take place.
B. Repairs. Normal maintenance and repair of a structure containing a nonconforming use is permitted, provided that it does not extend the area or volume of space occupied by the nonconforming use, does not increase the number of dwelling units, and does not increase the floor area ratio, where so regulated.
C. Nothing in this chapter shall prevent the strengthening or restoring to a safe or lawful condition any part of any building or structure declared unsafe or unlawful by the Construction Code Official or other authorized state or Village official.
D. Change of title or ownership does not discontinue a nonconforming use.