R9 R10

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

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.