Permit such variance such as the front yard, side yard, rear yard, lot width, lot depth, coverage, minimum setback standards, off-street parking, off-street loading regulations, lot area, maximum height, or building, where the literal enforcement of the provisions of this ordinance would result in an unnecessary hardship, or where such variance is necessary to permit a specific parcel of land which differs from other parcels of land in the same district by being of such area, shape or slope that it cannot be developed in a manner commensurate with the development permitted upon other parcels of land in the same district.