The provisions of this Article shall apply to all nonconforming uses or bulk legally existing on the effective date of this chapter and to uses or bulk that become nonconforming by reason of any amendment thereof and to buildings or other structures housing such uses.

Any lawful use of any land or building existing at the time of the enactment of this chapter may be continued indefinitely except as hereinafter provided in this Article.

A nonconforming use may be changed to a conforming use at any time, but shall not thereafter be changed back to a nonconforming use. No nonconforming use shall be changed to a different nonconforming use.

A nonconforming use shall not be enlarged or extended or relocated to a different position on the lot which it occupies. However, an application to the Zoning Board of Appeals may be made and a special permit granted by them for good reason for extending a lawful nonconforming use to another portion of the same building existing at the time of the adoption of this chapter, but no nonconforming use shall be extended to displace a conforming use.

A nonconforming use is hereby required to be maintained in such condition as will not constitute a danger to the safety, health or general welfare of the public. Customary maintenance of a building or other structure containing a nonconforming use is permitted, including nonstructural repairs and minor alterations so long as they do not increase or expand the nonconforming use.

No lot shall be reduced in area so that it creates a nonconforming bulk or use in violation of any regulations contained in this chapter.

If a nonconforming use or a building or other structure of nonconforming bulk sustains an amount of damage or destruction by any cause which in amount is appraised by a New York State certified appraiser to be 50% or more of its true value, the building, other structure or tract of land shall thereafter be only eligible for, and only occupied by, a conforming use. The damaged portions of the building or other structure shall, if rebuilt or reconstructed, conform to pertinent use and bulk regulations for the zoning district in which it is located. Where damage or destruction is appraised at less than 50% of the true value of the property, the property may be repaired or rebuilt for the same, but not a different, nonconforming use.

When a nonconforming use has been discontinued or abandoned for a period in excess one year, it shall not therefore be reestablished, and the future use shall be in conformity with the provisions of this chapter.

If any building in which any nonconforming use is conducted is terminated for a period of more than one year, the subsequent use of the land on which such building was located and the subsequent use of any building erected thereon shall conform with the regulations of the district.

Any building for which a permit has been lawfully granted and on which the construction has been started and diligently prosecuted before the effective date of this chapter may be completed.