A nonconforming use shall terminate upon abandonment at any time. In the case of discontinuance of any nonconforming open land use for a period of 12 consecutive months, the nonconforming open land use shall be presumed to be abandoned and any subsequent use of the land shall conform to the regulations for the district in which such land is located. In addition, when a nonconforming use of a structure, or structure and premises in combination is discontinued for a period of 24 consecutive months, the nonconforming use shall be presumed to be abandoned and the structure or structure and premises in combination, as the case may be, shall not thereafter be used except in conformance with the regulations of the district in which it is located.

An existing structure devoted to a use not permitted by this ordinance in the district structurally altered in any way except as may be required for normal maintenance or to prevent damage or injury. A preexisting, nonconforming use in a structure may be changed to a use permitted in the district in which it is located.

If no structural alterations are made, any nonconforming use of the structure, or structure and premises, may be changed to another nonconforming use subject to conditions imposed by the Zoning Board of Adjustment, provided that the Board, by making findings in a specific case, shall find that the proposed use, as conditioned, is equally appropriate or more appropriate to the neighborhood than the existing nonconforming use.

Any structure or structure and land in combination in or on which a nonconforming use is superseded by a permitted use shall thereafter conform to the regulations of the district in which said structure is located and the nonconforming structure or use shall not thereafter be reinstituted.

A structure which, by reason of restrictions on area, lot coverage, height, yards or other characteristics that could not be built under the terms of this ordinance: