Variance of area or yard requirements. Where, by reason of exceptional narrowness, shallowness or shape of a specific piece of property; by reason of exceptional topographic conditions or physical features uniquely affecting a specific piece of property; or by reason of other extraordinary and exceptional situation or condition of such piece of property or the structures thereon, the strict application of any regulation of this chapter would result in peculiar and exceptional practical difficulties or in 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 any difficulties or hardships; and where, in an application or appeal relating to a specific piece of property, the purposes of this chapter would be advanced by a deviation from the chapter's requirements and the benefits of the deviation would substantially outweigh any detriment, to grant a variance to allow departure from the zoning regulations.