A.
Except as hereinafter provided, no building or structure, or part thereof, and no lot or land, or part thereof, shall hereafter be used except in conformity with the use regulations herein prescribed. Any use that does not conform to the use regulations of this chapter shall be deemed a nonconforming use, except that uses granted by special use permit by the Planning Board and approved by the City Council pursuant to Article VII shall be deemed to be conforming uses. Any use of a parcel of land or lot, or use of a building or structure for which a use variance has been granted by the Zoning Board of Appeals pursuant to Article VIII shall be deemed to be a nonconforming use.
B.
Except as hereinafter provided, no building or structure or part thereof shall hereafter be erected, structurally altered, enlarged or rebuilt except in conformity with the dimensional regulations herein prescribed. Any building or structure that does not conform to the dimensional regulations of this chapter shall be deemed a nonconforming structure, irrespective of the use to which it is put. Buildings or structures for which area variances have been granted by the Zoning Board of Appeals pursuant to Article VIII shall be deemed to be nonconforming buildings or nonconforming structures.