Where by reason of exceptional narrowness, shallowness or slope of a specific piece of property or by reason of exceptional topographic conditions or by reason of other extraordinary and exceptional situation or condition of such piece of property, the strict application of any regulation in this chapter would result in peculiar and exceptional practical difficulties to or exceptional and undue hardship upon the owner of such property, grant, upon an application or an appeal relating to such property, a variance from such strict application so as to relieve such difficulties or hardship, including a variance for a conditional use, provided however, that no variance shall be granted under this subsection to allow a structure or use in a district restricted against such structure or use, and further provided that the proposed development does not require approval by the Planning Board of subdivision, site plan or conditional use in conjunction with which the Planning Board shall review a request for a variance pursuant to this chapter.