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

(a)        Pedestrian access to uses

No access from the Fifth Avenue street line or within 50 feet of the Fifth Avenue street line shall be permitted to lobbies for office, residential or hotel uses or to any new use not listed in Use Group F, except when the zoning lot is inaccessible from any other street, in which case the total amount of frontage occupied by lobby space or entrance space for such uses shall not exceed 40 feet or 25 percent of the building's total street frontage, whichever is less.

No public plaza, or any part thereof, shall be permitted on or within 50 feet of the Fifth Avenue street line.

(b)        Off-street parking regulations

No off-street parking facilities are permitted within the Fifth Avenue Subdistrict.

(c)        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.