In the districts indicated without a letter suffix, except for Quality Housing buildings, and except as set forth in paragraph (c) of this Section, any portion or portions of buildings which in the aggregate occupy not more than 40 percent of the lot area of a zoning lot, or for zoning lots of less than 20,000 square feet, the percentage set forth in the table below, may penetrate an established sky exposure plane in accordance with the provisions of this Section. Such portions of buildings that penetrate a sky exposure plane are hereinafter referred to as towers.
LOT COVERAGE OF TOWERS ON SMALL ZONING LOTS
Area of Zoning Lot (in square feet)
Maximum Percent of Lot Coverage
10,500 or less
10,501 to 11,500
11,501 to 12,500
12,501 to 13,500
13,501 to 14,500
14,501 to 15,500
15,501 to 16,500
16,501 to 17,500
17,501 to 18,500
18,501 to 19,999
Buildings developed or enlarged with towers shall comply with either tower-on-a-base regulations or standard tower regulations, as follows:
(a) Applicability of tower-on-a-base regulations
The tower-on-a-base regulations of Section 23-651 shall apply to any such building that:
(1) contains more than 25 percent of its total floor area in residential use ; and
(2) is located on a zoning lot that fronts upon a wide street and is either within 125 feet from such wide street frontage along the short dimension of the block or within 100 feet from such wide street frontage along the long dimension of the block.
If a portion of such building is developed or enlarged with a tower the entire zoning lot shall be subject to the provisions of Section 23-651 (Tower-on-a-base).
(b) Applicability of standard tower regulations
The standard tower regulations of Section 23-652 shall apply to any such building that does not meet the location and floor area criteria of paragraph (a) of this Section.
(c) Inapplicability of tower regulations
The provisions of this Section shall not apply to any building located wholly or partly in a Residence District, that is within 100 feet of a public park with an area of one acre or more, or a street line opposite such a public park.