Whenever a zoning lot is divided by a boundary between two or more districts and such zoning lot did not exist on December 15, 1961, or any applicable subsequent amendment thereto, 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. However, the provisions of paragraph (a) of Section 77-22 (Floor Area Ratio) and Section 77-40 (SUPPLEMENTAL REGULATIONS) shall apply to zoning lots created at any time where different bulk regulations apply to different portions of such zoning lot.