Restoration. Any nonconforming building or structure damaged less than 50% of its then existing floor area may be restored, reconstructed, or used as before, provided that the volume of such use, building, or structure shall not exceed the volume of which existed prior to such damages by more than 25%, or as provided under § 27-804 hereof, and that it be completed within one year of such happening, and provided that such, restorations shall be in conformity with the requirements of this Chapter.