Subject to the provisions of § 188-35 and except as otherwise provided in this chapter, the lawful use of land or buildings existing at the date of the adoption of this chapter may be continued, although such use or building does not conform to the regulations specified by this chapter for the zone in which such land or building is located: provided, however, that:
A.
No nonconforming lot shall be further reduced in size.
B.
No nonconforming structure or lot shall be enlarged, extended or increased, unless such enlargement would tend to reduce the degree of nonconformance.
C.
No nonconforming use may be expanded.