R1 R2 R3 R4 R5

In the districts indicated, for zoning lots that meet the criteria of paragraph (a) of this Section, the height and setback modifications set forth in paragraph (b) shall apply.

1. Eligible sites
   
   The provisions of this Section shall apply to large sites that are qualifying residential sites or zoning lots located in R3-2, R4, R5, R5B or R5D Districts. 
   
   However, for large sites with existing buildings, eligible portions of the zoning lot for developments or enlargements:
   1. shall not include open space with amenities used for recreational purposes, such as play equipment, court game facilities, ball fields or fixed tables and chairs, unless such space is replaced in kind and size on the same zoning lot; and 
   2. shall be located, partially or entirely, within 100 feet of a street line.
2. Modified height and setback provisions
   
   For eligible zoning lots, the maximum base height and maximum building heights set forth in Section 23-424 shall apply. However, where either the height at roof level of an existing building, or ornamental features in an existing non-residential building or other structure, meet or exceed the maximum heights set forth in such table, the maximum heights may be increased by 10 feet, or the height of such roof level or ornamental feature, whichever is lower.