R1 R2 R3 R4 R5

In the districts indicated for any zoning lot, the minimum required open space or open space ratio shall not be less than set forth in this Section, and the maximum lot coverage shall not exceed the lot coverage as set forth in this Section. Any given lot area or area of open space shall be counted only once in determining the floor area ratio, the amount of open space or the open space ratio.

In R1 and R2 Districts without a letter suffix, the floor area and open space provisions of Section 23-141 shall apply. In R1 and R2 Districts with a letter suffix, and R3, R4 and R5 Districts, the provisions of Section 23-142 shall apply.

In R4 and R5 Districts without a letter suffix, the provisions of Section 23-143 shall apply to buildings utilizing the optional provisions for a predominantly built-up area. In R3-2, R4 and R5 Districts without a letter suffix, the provisions of Section 23-144 shall apply to affordable independent residences for seniors.  

For zoning lots with buildings containing multiple uses or multiple buildings with different uses, the maximum floor area ratio for each use shall be as set forth in the applicable provisions of this Section, inclusive, or Section 24-10 (FLOOR AREA AND LOT COVERAGE REGULATIONS), inclusive, provided the total of all such floor area ratios does not exceed the greatest floor area ratio permitted for any such use on the zoning lot. However, for zoning lots providing affordable independent residences for seniors and other residential uses, the sum of all floor area allocated to uses other than affordable independent residences for seniors on the zoning lot shall not exceed the maximum floor area ratio permitted for residential uses set forth in Sections 23-142 or 23-143, as applicable.

Where floor area in a building is shared by multiple uses, the floor area for such shared portion shall be attributed to each use proportionately, based on the percentage each use occupies of the total floor area of the zoning lot, less any shared floor area.

In addition to complying with the provisions of this Section, all zoning lots shall be subject to the provisions set forth in Section 23-22 (Maximum Number of Dwelling Units) as well as all other applicable bulk regulations as set forth in this Chapter.