64-313

Special height and setback regulations for all buildings

The regulations for permitted obstructions to applicable height and setback regulations shall be modified in accordance with the provisions of this Section.

(a)        Bulkheads and mechanical equipment in low-density Residence Districts

In R3-2, R4, and R5 Districts, except R4-1, R4A, R4B and R5A Districts, for buildings other than single- and two-family residences, the underlying permitted obstructions regulations governing elevator or stair bulkheads (including shafts, and vestibules not larger than 60 square feet in area providing access to a roof), roof water tanks, and accessory mechanical equipment, other than solar or wind energy systems, may be modified as follows:

(1)        In R3-2 and R4 Districts, for buildings, or portions thereof, subject to the provisions of Article II, Chapter 3, the provisions of Section 23-621 (Permitted obstructions in certain districts) shall be modified to permit such obstructions, provided that:

(i)        such obstructions shall be located not less than 10 feet from the street wall of a building ;

(ii)        all mechanical equipment shall be screened on all sides;

(iii)        the lot coverage of all such obstructions and such screening shall not exceed 250 square feet or 10 percent of the lot coverage of the building, whichever is greater; and

(iv)        such obstructions are limited to a height of 15 feet above the maximum height of perimeter walls;

(2)        In R3-2 and R4 Districts, for buildings, or portions thereof, subject to the provisions of Article II, Chapter 4, the provisions of paragraph (f) of Section 24-51 (Permitted Obstructions) shall apply, except that the maximum lot coverage may be increased from 20 percent to 30 percent of the lot coverage of the building, provided that such obstructions are limited to a maximum height of 25 feet;

(3)        In R5 Districts, the provisions of paragraph (g) of Section 23-62 (Permitted Obstructions), and paragraph (f) of Section 24-51 shall apply, as applicable, except that the maximum lot coverage may be increased from 20 percent to 30 percent of the lot coverage of the building, provided that such obstructions are limited to a maximum height of 25 feet.

(b)        Bulkheads and mechanical equipment in medium- and high-density Residence Districts, and Commercial and Manufacturing Districts

In R6 through R10 Districts, and in all Commercial and Manufacturing Districts, the underlying permitted obstructions regulations of paragraph (g) of Section 23-62, paragraph (f) of Section 24-51, paragraph (f) of Section 33-42, or paragraph (e) of Section 43-42, as applicable, governing elevator or stair bulkheads (including shafts, and vestibules not larger than 60 square feet in area providing access to a roof), roof water tanks, and accessory mechanical equipment, other than solar or wind energy systems, may be modified as follows:

(1)        where the maximum permitted height of a building, or portion thereof is less than 120 feet:

(i)        the maximum lot coverage may be increased from 20 percent to 30 percent of the lot coverage of the building, provided that such obstructions are limited to a maximum height of 25 feet; or

(ii)        the maximum permitted height of such volume may be increased from 25 feet to 33 feet, provided that the lot coverage of all such obstructions does not exceed 20 percent of the lot coverage of the building;

(2)        where the maximum permitted height of a building, or portion thereof is 120 feet or greater:

(i)        the maximum lot coverage may be increased from 20 percent to a maximum lot coverage of 30 percent of the lot coverage of the building, provided that such obstructions are limited to a maximum height of 40 feet; or

(ii)        the maximum permitted height of such volume may be increased from 40 feet to 55 feet, provided that the lot coverage of all such obstructions does not exceed 20 percent of the lot coverage of the building.

(c)        Dormers

For Quality Housing buildings, or portions thereof, as an alternative to the provisions of paragraph (c) of Section 23-621, dormers may be a permitted obstruction within a required front setback distance above a maximum base height, provided that the aggregate width of all dormers at the maximum base height does not exceed 40 percent of the width of the street wall of the highest story entirely below the maximum base height. Such dormers need not decrease in width as the height above the maximum base height increases.

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