R6 R7 R8 R9 R10

In the districts indicated without a letter suffix, for sky exposure plane buildings, the height and setback regulations shall be as set forth in this Section, inclusive. 

Buildings may elect to utilize the front setback provisions of paragraph (a) of this Section, or the alternate front setback provisions of paragraph (b) of this Section. Where elected, such provisions shall supersede the provisions of Section 23-43, inclusive. 

In R9 or R10 Districts, towers may penetrate a sky exposure plane pursuant to Section 23-737 (Tower regulations). 

Notwithstanding the foregoing, for narrow buildings, the provisions of Section 23-738 shall apply. 

1. Front setbacks
   
   If the front wall or other portion of a building or other structure is located at the street line or within the initial setback distance set forth in the following table, the height of such front wall or other portion of a building or other structure shall not exceed the maximum height above the street line set forth in the table. Above such specified maximum height and beyond the initial setback distance, the building or other structure shall not penetrate the sky exposure plane set forth in the table, except as otherwise provided in Sections 23-41 (Permitted Obstructions) or 23-737 (Tower regulations).
    

   MAXIMUM HEIGHT OF FRONT WALL AND REQUIRED FRONT SETBACKS

   Initial Setback Distance (in feet)		Maximum Height of a Front Wall or other portion of a Building or Other Structure within the Initial Setback Distance	Sky Exposure Plane
   			Height above Street Line (in feet)	Slope over Zoning Lot (expressed as a ratio of vertical distance to horizontal distance)
   				On Narrow Street		On Wide Street
   On Narrow Street	On Wide Street			Vertical Distance	Horizontal Distance	Vertical Distance	Horizontal Distance
   R6 or R7 Districts
   20	15	60 feet or six stories, whichever is less	60	2.7	to 1	5.6	to 1
   R8 R9 or R10 Districts
   20	15	85 feet or nine stories, whichever is less	85	2.7	to 1	5.6	to 1

    

   

2. Alternate front setbacks
   
   If an open area is provided along the entire length of the front lot line with the minimum depth set forth in the table in this Section, the provisions of this Section may apply in lieu of the provisions of paragraph (a) of this Section. The building or other structure shall not penetrate the sky exposure plane set forth in the table, except as otherwise provided in Sections 23-41 (Permitted Obstructions) or 23-737 (Tower regulations).
   
   In R9 or R10 Districts, the provisions of this paragraph shall be inapplicable to any development or enlargement with more than 25 percent of the total floor area of the building in residential use.

    

   ALTERNATE REQUIRED FRONT SETBACKS

   Depth of Optional Front Open Area (in feet, measured perpendicular to street line)		Alternate Sky Exposure Plane
   		Height above Street Line (in feet)	Slope over Zoning Lot (expressed as a ratio of vertical distance to horizontal distance)
   			On Narrow Street		On Wide Street
   On Narrow Street	On Wide Street		Vertical Distance	Horizontal Distance	Vertical Distance	Horizontal Distance
   R6 or R7 Districts
   15	10	60	3.7	to 1	7.6	to 1
   R8 R9 or R10 Districts
   15	10	85	3.7	to 1	7.6	to 1