Except as otherwise provided in this article, the lawful use of land or buildings existing at the date of the adoption of this chapter (June 12, 1978) 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. However, no nonconforming building shall be enlarged, expanded, extended or increased so as to extend a greater distance into the minimum yards required for the zone in which it is located, unless the total minimum yard distance requirements of this chapter are maintained and all other requirements of this chapter relating to the zone in which said nonconforming building is located are complied with. Nothing herein contained shall be construed as permitting the extending or expanding of any nonconforming use or the reestablishing of any nonconforming use after its abandonment.

A nonconforming use shall be adjudged and deemed abandoned when there occurs a cessation of any such use or activity by an apparent act or failure to act on the part of the tenant or owner to reinstate such use within a period of one year from the date of cession or discontinuance.

No nonconforming use shall, if once changed into a conforming use, be changed back again into a nonconforming use.