Any nonconforming building, structure, fence, wall or sign which has been damaged by fire, windstorm, explosion, flood or other causes to the extent of 75% of its value may be repaired, rebuilt or replaced only for a use in conformity with the uses permitted for the district in which it is located. This provision shall apply to the building or structure in question, regardless of the value of other buildings on the same lot or making up part of the same complex of buildings or structures.