Section 23-737 - Tower regulations
In R9 or R10 Districts, for buildings that do not meet the criteria set forth in paragraphs (b)(1) and (b)(2) of Section 23-441 , a tower may penetrate a sky exposure plane provided that such tower:
does not occupy more than 40 percent of the lot area of a zoning lot for zoning lots with a lot area greater than 20,000 square feet, or more than 50 percent of the lot area for all other zoning lots ; and is set back at least 10 feet from a street line along a wide street and at least 15 feet from a street line along a narrow street .
However, 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 .