23-732 - Floor area ratio and open space ratio in R6 through R9 Districts LAST AMENDED 12/5/2024 R6 R7 R8 R9 In the districts indicated without a letter suffix, for #sky exposure plane buildings#, the minimum required #open space ratio# and the maximum #floor area ratio# for any #zoning lot# shall be determined by the #height factor# of such #zoning lot# as set forth in this Section. Where elected, such #floor area ratio# shall supersede the #floor area ratio# provisions of Section 23-22, and apply to all #residences#, including #qualifying affordable housing# or #qualifying senior housing#. The minimum #open space# required through the application of a minimum #open space ratio# shall be applied in conjunction with the applicable regulations of Section 23-30 (YARDS, COURTS AND OTHER OPEN AREA REGULATIONS). The obstructions set forth in Section 23-311 shall per permitted in required #open space#. MINIMUM REQUIRED OPEN SPACE RATIO AND MAXIMUM FLOOR AREA RATIO R6 through R9 Districts In R6 Districts In R7 Districts In R8 Districts In R9 Districts Min. Max. Min. Max. Min. Max. Min. Max. For Req. #Floor Req. #Floor Req. #Floor Req. #Floor #zoning #Open Area #Open Area #Open Area #Open Area lots# Space Ratio# Space Ratio# Space Ratio# Space Ratio# with a Ratio# Ratio# Ratio# Ratio# #height factor# of 1 27.5 0.78 15.5 0.87 5.9 0.94 1.0 0.99 2 28.0 1.28 16.0 1.52 6.2 1.78 1.4 1.95 3 28.5 1.62 16.5 2.01 6.5 2.51 1.8 2.85 4 29.0 1.85 17.0 2.38 6.8 3.14 2.2 3.68 5 29.5 2.02 17.5 2.67 7.1 3.69 2.6 4.42 6 30.0 2.14 18.0 2.88 7.4 4.15 3.0 5.08 7 30.5 2.23 18.5 3.05 7.7 4.55 3.4 5.65 8 31.0 2.30 19.0 3.17 8.0 4.88 3.8 6.13 9 31.5 2.35 19.5 3.27 8.3 5.15 4.2 6.54 10 32.0 2.38 20.0 3.33 8.6 5.38 4.6 6.85 11 32.5 2.40 20.5 3.38 8.9 5.56 5.0 7.09 12 33.0 2.42 21.0 3.41 9.2 5.71 5.4 7.30 13 33.5 2.43 21.5 3.42 9.5 5.81 5.8 7.41 14 34.0 2.43 22.0 3.44 9.8 5.92 6.2 7.52 15 34.5 2.43 22.5 3.42 10.1 5.95 6.6 7.52 16 35.0 2.42 23.0 3.41 10.4 5.99 7.0 7.52 17 35.5 2.42 23.5 3.40 10.7 6.02 7.4 7.52 18 36.0 2.40 24.0 3.38 11.0 6.02 7.8 7.46 19 36.5 2.39 24.5 3.36 11.3 6.02 8.2 7.41 20 37.0 2.38 25.0 3.33 11.6 6.02 8.6 7.35 21 37.5 2.36 25.5 3.30 11.9 5.99 9.0 7.25 For #zoning lots# with #height factors# greater than 21, the minimum required #open space ratio# shall be as set forth in the following table: OPEN SPACE RATIO FOR HIGH BUILDINGS District Minimum Required Additional Required #Open Space Ratio# #Open Space Ratio# at #Height Factor# of for each Additional 21 #Height Factor# R6 37.5 0.5 R7 25.5 0.5 R8 11.9 0.3 R9 9.0 0.4 For these #zoning lots#, the maximum #floor area ratio# shall be such as can be attained at the required #open space ratio# for the #height factor#.* * The #floor area ratio# attainable at a given #height factor# and a given #open space ratio# may be computed from the following formula: