Where one parcel of property is divided into two or more portions by reason of different zoning district classifications, each of these portions shall be used independently of the others in its respective zoning classification, and for the purpose of applying the regulations of the Zoning Ordinance, each portion shall be considered as if in separate and different ownership. If there is uncertainty that all portions of the parcel independently meet the regulations for their respective districts, including applicable setbacks for existing structures, the Zoning Administrator shall require a Plat of Survey or Plat of Subdivision, as appropriate, to divide the parcel along all proposed zoning district boundary lines in order to demonstrate all requirements are met.