[1975 Code § 13-8.1]
If on February 14, 1972, any lot use or building is being lawfully used for a purpose which does not conform to the requirements of the particular zone where the lot or building is situated, the use may be continued, subject to other provisions contained in this section, and any change of title of possession shall not affect the continuance of such existing use. The existing use may be continued as aforesaid, provided that:
a. No nonconforming lot shall be further reduced in size.
b. No nonconforming building shall be enlarged, extended or increased.
c. No nonconforming use may be expanded.
d. No structural alterations or substantial major changes shall be made in any building containing a nonconforming use.
e. No structural alterations shall be made in a building containing a nonconforming use in order to change the use of such a building or structure to another or an additional nonconforming use.