Any development or enlargement within the Grand Central Core Area, as shown on Map 2 (East Midtown Subdistrict and Subareas) in Appendix A of this Chapter, shall be subject to the provisions of Sections 81-45 (Pedestrian Circulation Space), 81-46 (Off-street Relocation or Renovation of a Subway Stair) and 81-48 (Off-street Improvement of Access to Rail Mass Transit Facility), except that:

(a)        no arcade shall be allowed;

(b)        a sidewalk widening may be provided only for a building occupying an Avenue frontage, provided that such sidewalk widening extends for the length of the full block front; and

(c)        for developments or enlargements on zoning lots located within the Vanderbilt Corridor Subarea, as shown on Map 2, up to a maximum of 3,000 square feet of on-site improvements to the public realm provided in accordance with a special permit pursuant to Section 81-632 (Special permit for transfer of developments rights from landmarks to the Vanderbilt Corridor Subarea) or Section 81-633 (Special permit for Grand Central public realm improvements) may be applied toward the pedestrian circulation space requirement.