Where the Board of Supervisors has approved development plans in the RRD Residential Revitalization District for a tract meeting the requirements stated herein, individual units, buildings, or parcels of land within the approved RRD Residential Revitalization District development may be subdivided, leased, purchased, sold, mortgaged, and developed as individual zero lot line units or as individual parcels containing multiple dwelling units without meeting the development standards of § 200-20; provided, however, that the development plan for the entire tract shall at all times remain compliant with the tract development standards applicable to the RRD Residential Revitalization District.