A building or structure, the use of which does not conform to the use regulations for the zone in which it is situated, shall not be enlarged, or extended unless such building or structure, including such enlargement or extension, is made to conform to all regulations, including use, for the zone in which it is situated.

Such nonconforming building shall not be structurally altered, except in conformity to this section; provided, however, that such maintenance and repair work as is required to keep a nonconforming building or structure in sound condition shall be permitted; and provided further that any such nonconforming use may be extended throughout any existing parts of the building which were manifestly arranged or designed for such use at the time of the adoption of these Regulations. Regarding condominiums, cooperative housing developments or similar uses, minor additions, including decks, sheds or similar structures that do not add additional units, shall be exempt from requiring a variance for expansion of a nonconforming use and structure if the Planning and Zoning Office determines the proposed work does not substantially alter the intended approved use, provided the owner received approval from the subject condominium association in writing.

If no structural alterations are made, a nonconforming use of a building may be changed to another nonconforming use which under the special permit procedure of Section 7.3.4, the Zoning Commission finds to be of the same or of a more restricted nature, except that a nonconforming use in a residence, business or light industrial zone shall not be changed to a use permitted only in a heavy industrial zone or excluded from a heavy industrial zone, and except that a nonconforming use in a heavy industrial zone may not be changed to a use excluded from such zone.

If any building in or on which any nonconforming use is conducted or maintained is hereafter removed, the subsequent use of the land on which such building was located, and the subsequent use of any building thereon shall be in conformity with the regulations for the zone in which such land or building is located.

A nonconforming use, building, or structure shall not be deemed abandoned unless the property owner voluntarily discontinues such use, building, or structure and accompanies such discontinuance by a written statement establishing their intent to not reestablish such use, building, or structure. Demolition of a nonconforming use, building, or structure shall not, by itself, be evidence of such property owner's intent to not reestablish such use, building, or structure.

Nothing in these Regulations shall prevent the reconstruction of a building damaged by fire, explosion, accident, the act of God or of the public enemy to its condition and size prior to such damage or prevent the restoration of a wall or structural member.

Any building for which a permit has been duly granted, and the construction of which shall have been started before the effective date of these Regulations and which building these Regulations make nonconforming, may be completed in accordance with plans on file with the Building Inspector, provided that such construction is diligently prosecuted, and such is completed within one year of the date of these Regulations.

Any nonconforming use of buildings lawfully existing at the effective date of these Regulations or of any pertinent amendment thereto, may be continued and any building so existing which was designed, arranged, intended for or devoted to a nonconforming use may be reconstructed and structurally altered and the nonconforming use therein changed, all subject to the provisions of this section.