(a)        On a zoning lot with a front lot line coincident with any of the following street lines, a street wall shall be located on such street line for the entire frontage of the zoning lot on that street and shall rise without setback to a height of 85 feet above curb level:

(1)        the east side of Broadway between West 61st Street and West 65th Street;

(2)        the east side of Columbus Avenue between West 65th Street and West 66th Street;

(3)        the east side of Broadway between West 67th Street and West 68th Street;

(4)        the west side of Broadway between West 66th Street and West 68th Street; and

(5)        the west side of Broadway between West 60th Street and West 62nd Street.

Such street wall shall extend on a narrow street to a distance of not less than 50 feet from its intersection with the street line of Broadway or Columbus Avenue and shall include a 20 foot setback at a height of 85 feet above curb level as required in Section 33-432 (In other Commercial Districts).

(b)        On a zoning lot in Block 1, as indicated on the District Plan in Appendix A of this Chapter, with a front lot line coincident with any of the following street lines, a street wall shall be located on such street lines for the entire frontage of the zoning lot on that street:

(1)        the west side of Broadway between West 62nd Street and West 63rd Street;

(2)        the south side of West 63rd Street between Broadway and Columbus Avenue; and

(3)        the east side of Columbus Avenue between West 62nd Street and West 63rd Street.

The street wall located on the south side of West 63rd Street shall rise vertically without setback to the full height of the building except for the top four floors or 40 feet, whichever is less, and shall extend along Columbus Avenue and/or Broadway for no more than one-half of the length of the total block front. The street wall located on the remaining block front on Broadway shall rise to a height of 85 feet above curb level and then set back 20 feet as required in Section 33-432.

(c)        On a zoning lot in Block 2, as indicated on the District Plan, with a front lot line coincident with any of the following street lines, a street wall shall be located on such street line for the entire frontage of the zoning lot on that street:

(1)        the east side of Broadway between West 67th Street and West 66th Street;

(2)        the north side of West 66th Street between Broadway and Columbus Avenue; and

(3)        the west side of Columbus Avenue between West 66th Street and West 67th Street.

The street wall located on the north side of West 66th Street shall rise vertically without setback to the full height of the building except for the top four floors or 40 feet, whichever is less, and shall extend on Broadway and/or Columbus Avenue for no more than one-half of the length of the total block front. The street wall located on the remaining block front on Broadway shall rise to a height of 85 feet above curb level and then set back 20 feet as required in Section 33-432.

(d)        On a zoning lot in Block 3, as indicated on the District Plan, with a front lot line coincident with the street line of Central Park West, the street wall shall be located on such street line for the entire frontage of the zoning lot on that street.

The street wall fronting on Central Park West shall rise vertically without setback to a height of at least 125 feet but not greater than 150 feet and shall extend along the street line of West 61st Street and along the street line of West 62nd Street to a distance of not less than 50 feet but not more than 100 feet from their intersection with the west street line of Central Park West. Above that height, no building or other structure shall penetrate a sky exposure plane that starts at the street line and rises over the zoning lot at a ratio of 2.5 : 1.