The lawful use of any building or land existing at the time of the enactment of this chapter may be continued although such use does not conform to the provisions of this chapter. Normal maintenance, repairs and alterations incidental to a building or other structure containing a nonconforming use are permitted, provided that they do not extend the area or volume of space occupied by the nonconforming use

When any presently nonconforming use of land or buildings has been discontinued for two years, the land and buildings shall thereafter be used only in conformity with this chapter.

Once changed to a conforming use, no building or land shall be permitted to revert to a nonconforming use. A nonconforming use may be altered to a conforming use.

Notwithstanding any other provisions of this chapter, a nonconforming automobile wrecking yard or junkyard in existence at the date of enactment of this chapter shall, at the expiration of three years from such date, become a prohibited and unlawful use and shall be discontinued, except that a motor vehicle and machinery junkyard may continue as a nonconforming use if within that period it is maintained in accordance with the standards set and enforced by the State of New York and those required by the Town Board and herein indicated within this chapter.

Any building damaged by fire or other causes may be repaired or rebuilt for the same, but not a different, nonconforming use, provided that said construction is initiated within one year and is completed within two years from the date of damage and does not exceed its original dimensions.

Mobile homes existing at the time of enactment of this chapter may be replaced by another mobile home which shall conform to Article VIII, § 129-43, or a one-family dwelling which shall be in conformance with the provisions of this chapter.