If a nonconforming use or structure is partially destroyed by any cause whatsoever to an extent of fifty (50%) percent or more of the appraised value, it shall only be reestablished as a conforming use in the zone in which it is located. A nonconforming structure may only be rebuilt to the same size on the same footprint, provided however, that the structure may be modified to conform with the requirements of Chapter 26, Flood Damage Prevention.