Reconstruction of nonconforming use, building or structure. In the event that any nonconforming building or structure is destroyed to a degree of less than 50% by fire, explosion or other causes, such nonconforming use, building or structure may be reconstructed and the nonconforming use thereof continued if such reconstruction is commenced within six months of the date of the destruction or damage thereto and is pursued diligently to completion; provided, however, that in such reconstruction the said building or structure shall not exceed the size of the nonconforming building or structure destroyed or damaged, and shall be placed in the same location on the ground as the nonconforming use, building or structure destroyed or damaged, and the nonconforming use thereof shall not differ from that existing prior to such damage or destruction. If reconstruction does not commence within six months after the occurrence of the damage or destruction, or is not thereafter diligently completed, then any further use, buildings or structures on the lot shall be in conformity with the provisions of this chapter. If the destruction exceeds 50%, the right to the nonconformity shall expire and the remains shall be removed from the premises within six months.