Whenever a zoning lot is divided by a boundary between two or more districts and such zoning lot existed on December 15, 1961, or any applicable subsequent amendment thereto, the provisions of this Resolution may be applied to such zoning lot as set forth in subsequent Sections of this Chapter. Except as specifically provided in this Chapter, each portion of such zoning lot shall be regulated by all the provisions applicable to the district in which such portion of the zoning lot is located.