A. 
Continuation. Any lawful use of a building or land existing at the effective date of this chapter or authorized by a building permit issued prior thereto may be continued although such use does not conform to the provisions of this chapter.
B. 
Extension. A nonconforming use may be extended upon the lot occupied by such use and held in single and separate ownership at the effective date of this chapter when authorized as a special exception, provided that any extension or enlargement shall conform to the area and height regulations of the district in which it is situated.
C. 
Changes. A nonconforming use of a building or land may be changed to a nonconforming use of the same or more restricted classification if no structural alterations are made therein, provided that such change may include structural alterations when authorized as a special exception. Whenever a nonconforming use of a building or land has been changed to a use of a more restricted classification or to a conforming use, such use shall not thereafter be changed to a use of a less restricted classification.
D. 
Restoration. A nonconforming building which has been damaged or destroyed by fire, explosion, casualty or act of God or a nonconforming building which has been legally condemned may be reconstructed and used for the same nonconforming use, provided that the reconstructed building shall not exceed in height, area and volume the building destroyed or condemned, and the building reconstruction shall be commenced within one year from the date the building was destroyed or condemned and shall be carried on without interruption.
E. 
Abandonment. If a nonconforming use of a building ceases for a continuous period of one year or more or if a nonconforming use of land ceases for any length of time for any reason, subsequent use of such building or land shall be in conformity with the provisions of this chapter.
F. 
Nonconforming uses. Where a structure is proposed to be expanded on a nonconforming lot and where the expansion will not encroach further into the front, side or rear yard setback, then such expansion will be reviewed by the Zoning Hearing Board as a special exception.