To authorize a variance of the front yard, side yard, rear yard, lot width, lot depth, coverage, setback standards, off-street parking, or off-street loading regulations where the literal enforcement of the provisions of this GDC would result in an unnecessary hardship, and where the variance is necessary to permit the use of a specific parcel of land which differs from other parcels of land in the same district by being of such a restricted 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. A modification of the standards established by this GDC may not be granted to relieve a self-created or personal hardship, or for mere financial hardship. Further, a variance may not be granted to permit a person a privilege in developing a parcel of land not permitted by this GDC, or not permitted on other parcels of land in the district. No variance may be granted if the granting of the variance will create an unnecessary hardship as herein defined on another parcel of property.