The following requirements listed in this Section shall apply to all developments, enlargements, extensions or changes of use within the Subdistrict:

1. Plaza location
   
   No public plaza, or any part thereof, shall be permitted on or within 50 feet of the Fifth Avenue street line.
2. Off-street parking regulations
   
   No off-street parking facilities are permitted within the Fifth Avenue Subdistrict.
3. Off-street loading regulations
   
   In no event shall access to accessory off-street loading berths be permitted on or within 50 feet of the Fifth Avenue street line. Beyond 50 feet from the Fifth Avenue street line, where three or more accessory loading berths are required, such berths shall be located below street grade. Access to such berths, however, shall be permitted at street grade.
   
   Interior lots with a frontage only on Fifth Avenue or only on a wide street shall not contain loading berths.