Restoration. Except as in subsection B of this section, any nonconforming use or structure damaged by fire, casualty or act of God may be repaired, restored, reconstructed or used as before, provided that the area of such use or structure shall not exceed the area which existed prior to the damage. All repairs shall be commenced within one year after damage occurs and shall be completed within two years of such date, or such use shall not be rebuilt except as a conforming use.