Along Eighth Avenue, street walls shall be provided as follows:

(a)        A street wall shall be provided for the mandatory public space required pursuant to paragraph (a) of Section 93-74. Such street wall shall extend for at least 100 feet along the Eighth Avenue sidewalk widening line and rise without setback to a minimum height of 60 feet. No portion of such street wall shall exceed a height of 150 feet within 15 feet of the Eighth Avenue street line. However, such street wall may encroach upon the mandatory sidewalk widening provided the height of such street wall within the sidewalk widening does not exceed 90 feet.

(b)        In addition to the street wall required pursuant to paragraph (a) of this Section, street walls shall be provided along at least 35 percent of the Eighth Avenue frontage of the zoning lot. Such street walls shall be located within 10 feet of the Eighth Avenue street line and rise without setback to a minimum height of 90 feet and a maximum height of 150 feet, except that no setbacks shall be required where such street walls are located 10 feet from the Eighth Avenue street line.

(c)        No street walls shall be located further than 10 feet from the Eighth Avenue street line unless they front upon a public plaza provided pursuant to paragraph (c) of Section 93-74. Along West 31st and West 33rd Streets, any portion of a street wall that exceeds a height of 150 feet shall be set back at least 15 feet from the West 31st and West 33rd Street street lines, as applicable. As an alternative, if the entire building is set back at least 10 feet from the West 31st or West 33rd Street street line, such building may rise without setback along such street.