All uses and buildings and other structures lawfully existing prior to the adoption or amendment of this chapter not conforming to the regulations of the district in which they are located at the time of the enactment of this chapter or amendment hereto shall be known and regarded as "nonconforming," and the following regulations shall apply to them.

A nonconforming building or use may be continued but may not be changed to another nonconforming use. No additions to or extensions of a nonconforming building or use may be made exceeding 50% of the existing nonconforming footprint of the existing building. Any expanded footprint pursuant to this section must comply with the minimum horizontal separation from adjoining buildings as provided by the New York State Building Code then in effect. Any such expanded footprint shall not increase any nonconformance with setback requirements adjacent to or along a public road. A second story may be added to any single-story building to be expanded pursuant to this section; provided, however, that all second-story expansion must comply with the New York State Building Code then in effect and shall be limited to the existing footprint or expanded footprint. Subsequent to such an extension, addition, or addition of a second story to a nonconforming building or use, there shall be no further additions or extensions except in accordance with the regulations of the district in which such building or use is located. Any nonconforming use conducted all or partially in the open may not be expanded by more than 50% of the service capacity of the use conducted all or partially in the open.

If a nonconforming building or use is subsequently changed to conform to the regulations of the district in which it is located, it shall not again be altered or used except in accordance with such regulations. If a nonconforming building is destroyed by any cause to the extent of 75% or more of its assessed value or its bulk, it shall not be rebuilt and reoccupied except in conformity with the regulations of the district in which it is located. No nonconforming sign or billboard, if blown down or otherwise demolished or taken down, shall be reconstructed or replaced. The vacation of a nonconforming building or use for a consecutive period of one year shall be deemed a permanent vacation, and thereafter the building shall not be reoccupied except in conformity with the regulations of the district in which it is located, and the use shall not be resumed.

The above limitations shall not apply to a building or other structure which is nonconforming only in respect to required yard space or area per dwelling unit, except that no such building or other structure shall be altered to or reconstructed to extend further into an already deficient yard space or to reduce an already deficient amount of land area per dwelling unit.

Notwithstanding the limitations imposed by any other provision of this chapter, any lot held in single and separate ownership prior to the adoption of this chapter and whose area or width is less than the specified minimum lot requirements of this chapter for the district may be considered as complying with such minimum lot requirements, and no variance shall be required for the issuance of a building permit, provided that:

Lots smaller than 6,000 square feet and/or with less than 60 feet of lot width may not be built upon.

No nonconforming use conducted entirely in the open may be changed to another nonconforming use.

Temporary permits may be authorized by the Planning Board, and issued by the Zoning Officer and Code Enforcement Officer, for a period not to exceed one year, for a nonconforming use incidental to a housing or construction project, including such structures or uses as storage of building materials and machinery, the processing of building materials and a real estate office located on a tract being offered for sale, provided that such a permit is issued upon written agreement by the owner to remove the structure or structures or the use upon expiration of the permit. Such a permit may be annually renewed for a total period not exceeding three years.