The open space ratio requirements of Section 23-15 (Open Space and Floor Area Regulations in R6 Through R10 Districts) and the lot coverage requirements of Sections 23-15 and 24-11 (Maximum Floor Area Ratio and Percentage of Lot Coverage) shall not apply. In lieu thereof, the aggregate lot coverage for all buildings shall comply with the following requirements:

(a)        The maximum lot coverage from the base plane to a height that is 20 feet above the base plane shall be 70 percent.

(b)        The maximum lot coverage from a height that is more than 20 feet above the base plane to a height that is 60 feet above the base plane shall be 60 percent.

(c)        The maximum lot coverage from a height that is more than 60 feet above the base plane to a height that is 180 feet above the base plane shall be 45 percent.

(d)        The maximum lot coverage above a height of 180 feet above the base plane shall be 25 percent.

The City Planning Commission may authorize an increase in the maximum lot coverage as set forth in paragraph (c) of this Section to up to 55 percent, upon finding that such increase is necessary to achieve the programmatic requirements of the development, and will not unduly restrict access of light and air to publicly accessible areas and streets.