1.   Authority to Continue. Any building, structure or use lawfully established and existing on the effective date of this chapter which does not conform to all of the regulations of the district in which it is located may be continued, subject to the provisions of this chapter on the effective date thereof, but which does not conform to any subsequent amendment thereof, may also be continued thereafter subject to the provisions of this chapter.

   2.   Repairs and Alterations. Repairs and alterations may be made to a nonconforming building, provided that no structural alterations shall be made in or to a building, all or substantially all of which is designed or intended for a use not permitted in the district in which it is located, except that structural alterations may be made if they are required by law or are necessary to make the building and use thereof conform to the regulations of the district.

   3.   Additions and Expansions. A nonconforming building which is nonconforming as to size, height or setbacks, or all or substantially all of which is designed or intended for a use not permitted in the district in which it is located, shall not be added to, expanded or enlarged unless such addition, expansion or enlargement conforms to all the regulations of the district in which it is located and unless the entire building thereafter conforms to all of the regulations of the district as to size. A nonconforming use of land shall not be expanded or extended beyond the area it occupies which would make it more nonconforming at the date of the adoption of this chapter.

   4.   Discontinuation. A building, all or substantially all of which is designed or intended for a use which is not permitted in the district in which it is located which is or hereafter becomes vacant and remains unoccupied or is not used for a period of one year, shall not thereafter be occupied or used except in a manner which conforms to the use regulations of the district in which it is located. If a nonconforming use of land is discontinued for a period of six months, such use shall not thereafter be renewed and any subsequent use of the land shall conform to the regulations of the district in which it is located.

   5.   Restoration of a Damaged Nonconforming Building. A building, designed or intended for a use which is not permitted in the district in which it is located, which is destroyed or damaged by fire or other casualty or act of God to the extent that the cost of restoration shall exceed 60 percent of the cost of replacement of the entire building, shall not be restored unless such building and use thereof shall conform to all the regulations of the district in which it is located. If the cost of restoration of such damaged building does not exceed 60 percent of the cost of replacement of the entire building, repairs or reconstruction shall be commenced within one year from the date of the fire or other casualty or act of God and diligently pursued until completion.

   6.   Uses Under “Special Permit Uses.” Any use for which a special exception is permitted as provided in this chapter shall not be deemed a nonconforming use but shall, without further action, be deemed a conforming use by special permit.