Where by reason of exceptional narrowness, shallowness, or shape of a specific piece of property, or by reason of exceptional topographic conditions or physical features uniquely affecting a specific piece of property, or by reason of an extraordinary and exceptional situation uniquely affecting a specific piece of property or the structures lawfully existing thereon, the strict application of any regulation pursuant to any zoning regulations of this chapter would result in peculiar and exceptional practical difficulties to, or exceptional and undue hardship upon, the developer of such property, grant, upon an application or an appeal relating to such property a variance for such strict application of such regulation so as to relieve such difficulties or hardship;