(a)        On a zoning lot with a front lot line along Broadway or Columbus Avenue as indicated on the District Plan in Appendix A of this Chapter, the street wall location provisions of paragraph (a) of Section 35-631 shall apply and except that the street wall shall rise without setback to a height of 85 feet above curb level.

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.

(b)        On a zoning lot in Block 1, as indicated on the District Plan in Appendix A of this Chapter, the street wall location provisions of paragraph (a) of Section 35-631 shall apply, except that:

(1)        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 

(2)        the street wall 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.

(c)        On a zoning lot in Block 2, as indicated on the District Plan the street wall location provisions of paragraph (a) of Section 35-631 shall apply, except that:

(1)        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 

(2)        the street wall 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.

(d)        On a zoning lot in Block 3, as indicated on the District Plan, the street wall location provisions of paragraph (a) of Section 35-631 shall apply, except that for purposes of applying the base heights the street wall shall extend to the base heights outlined in an R10A District.

(e)        Recessed fenestration and special architectural expression lines in the street wall are required per articulation allowances of paragraph (d) of Section 23-431 or Section 35-631.

In addition, along the street lines of Broadway, West 63rd Street and West 66th Street within Blocks 1 and 2, the street wall shall provide, at a height of 20 feet above curb level, an architectural expression line consisting of a minimum six inch recess or projection, for a minimum height of one foot and maximum height of two feet.