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 zoning regulations would result in peculiar and exceptional practical difficulties to or exceptional and undue hardship upon the developer of such property, to grant, upon an application or an appeal relating to such property, a variance from such strict application of such regulation so as to relieve such difficulties or hardship, including a variance for conditional use; provided, however, that no variance shall be granted to allow a structure or use in a district restricted against such structure or use, and provided further that the proposed development does not require approval by the Planning Board of a subdivision site plan or conditional use in conjunction with which the Planning Board shall review a request pursuant to N.J.S.A. 40:55D-60a.