C5-3 C5-5 C6-6 C6-7 C6-9

In the districts indicated, if a zoning lot is bounded by at least two street lines, a tower may occupy the percent of the lot area of a zoning lot set forth in this Section, provided that, except as otherwise set forth in Section 33-457 (Tower setbacks on narrow blocks), all portions of any building or buildings on such zoning lot, including such tower, are set back from street lines as required in this Section.

(a)        The maximum percent of lot area that may be occupied by such tower, shall be the sum of 40 percent plus one-half of one percent for every .10 by which the floor area ratio of such zoning lot is less than the floor area ratio permitted under the provisions of Sections 33-12 (Maximum Floor Area Ratio), 33-13 (Floor Area Bonus for a Public Plaza) or 33-14 (Floor Area Bonus for Arcades). The maximum lot coverage for any tower built under the provisions of this Section or for any building or buildings on any zoning lot occupied by such tower shall be 55 percent of the lot area of such zoning lot.

(b)        At all levels, including ground level, such building shall be set back from the street line as follows:

(1)        On narrow streets, by a distance equal to at least the fraction of the aggregate width of street walls of the tower, the numerator of which fraction is one and the denominator of which fraction is the sum of 3.0 plus .0667 for every .10 by which the floor area ratio of such building is less than the floor area ratio permitted under the provisions of Sections 33-12, 33-13 or 33-14, provided that such fraction shall be no less than one-fifth, and provided further that such setback need not exceed 45 feet.

(2)        On wide streets, by a distance equal to at least the fraction of the aggregate width of street walls of the tower, the numerator of which fraction is one and the denominator of which fraction is the sum of 4.0 plus .10 for every .10 by which the floor area ratio of such building is less than the floor area ratio permitted under the provisions of Sections 33-12, 33-13 or 33-14, provided that such fraction shall be no less than one-seventh, and provided further that such setback need not exceed 35 feet.

(c)        If a zoning lot occupies an entire block, the maximum setback, set forth in paragraph (b) of this Section, of 45 feet on each narrow street bounding the zoning lot may be reduced by one foot for every six feet of setback provided on a wide street bounding the zoning lot in addition to the setbacks otherwise required for wide streets as set forth in such paragraph, provided that no setback on a narrow street resulting from such reduction shall be less than 35 feet or one-tenth the aggregate width of street walls of the tower, whichever shall require the greater setback.

(d)        The additional setbacks on wide streets set forth in paragraph (c) of this Section may be provided entirely on one wide street or divided in any proportion among any two wide streets bounding the zoning lot.

(e)        Notwithstanding any other provision set forth in this Section, no building or portion of a building built under the provisions of this Section shall be set back less than 25 feet from the street line on narrow streets or less than 15 feet from the street line on wide streets.