For all developments or enlargements involving ground floor level construction on a zoning lot that is wholly or partially located within a Transit Easement Zone, as shown on Map 3 (Special Inwood District – Transit Easement Zones) in the Appendix to this Chapter, a transit easement volume may be needed on such zoning lot for public access between the street and the adjacent above- or below-grade subway station, pursuant to the provisions of Section 66-20 (SPECIAL PROVISIONS FOR PRIMARY TRANSIT-ADJACENT SITES). Such zoning lots that are wholly or partially within a Transit Easement Zone shall be considered a primary transit-adjacent site, as defined in Section 66-11 (Definitions).