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In all districts, as indicated, the minimum distance between the portion of a building containing residences and any other building on the same zoning lot shall be as provided in this Section.

For the purpose of this Section, abutting buildings on a single zoning lot may be considered a single building. However, if two or more portions of a building are not connected or not abutting at a particular level, such separated portions shall comply with the applicable provisions of this Section. In applying such provisions, the height of such separated portions shall be measured from the roof of the connecting or abutting portion of such building, as applicable, instead of from the base plane.

1. Exceptions
   The provisions of this Section shall not apply to:
   1. buildings that are separated from each other by a rear yard equivalent; or
   2. space between a single-family, two-family, or three-family residence and a garage accessory thereto.
2. For single- and two-family residences
   
   For buildings with two or fewer dwelling units, the required minimum distance between any such residences and any other building with two or fewer dwelling units on the same zoning lot, or a non-residential building on the same zoning lot shall vary according to the height of such buildings. Such minimum distance shall be measured perpendicular to the building wall or window, as applicable. However, for buildings with two or fewer dwelling units, the required minimum distance between any such residences and an ancillary dwelling unit on the same zoning lot shall be 10 feet. 
   
   For buildings with two or fewer dwelling units, the required minimum distance between any such residences and a building with three or more dwelling units on the same zoning lot shall be subject to the provisions of paragraph (c) of this Section. 
   
    

   	Maximum Building Height above Base Plane or Curb Level, as Applicable (in feet)
   	35 or less	Between 35 and 50	Over 50
   Minimum distance	15	20	30

3. For buildings that contain three or more dwelling units
   
   The minimum distance between a building containing three or more dwelling units and any other building on the zoning lot shall be applied in accordance with the provisions of this Section. Where two or more portions of a building are separated completely from one another at a particular level above grade, such separated portions shall comply with paragraph (c)(1) of this Section. Where there are multiple buildings on a single zoning lot that do not connect at any level, such buildings shall comply with paragraph (c)(2) of this Section.
   1. For separated portions of a building
      
      The required minimum distance between any separated portion of a building containing dwelling units shall be as follows:
      1. where legally required windows face onto a separated portion of a building at or below a height of 75 feet, the minimum dimension between such separated portions shall not be less than 20 feet, and above a height of 75 feet, where permitted, the minimum dimension shall not be less than 30 feet; and
      2. where no legally required windows face onto a separated portion of a building at or below a height of 75 feet, the minimum dimension between such separated portions shall not be less than 10 feet, and above a height of 75 feet, where permitted, the minimum dimension shall not be less than 15 feet.
   2. Two or more buildings on a single zoning lot
      
      The minimum distance between two or more buildings on the same zoning lot that are not connected at any level shall be 40 feet, as measured between the closest points of such buildings, for portions of buildings lower than 125 feet, as measured from the base plane or curb level, as applicable.
      
      Portions of such buildings higher than 125 feet shall be at least 80 feet apart, as measured between the closest points of such buildings. However, such minimum distance need not exceed 40 feet if such portions of buildings above a height of 125 feet do not exceed, in aggregate, a lot coverage of 40 percent or, for lots of less than 20,000 square feet, the percentage set forth in the table below:
       

      AGGREGATED LOT COVERAGE OF PORTIONS OF BUILDINGS ON A SMALL ZONING LOT

      Area of Zoning Lot (in square feet)	Maximum Percent                                                                             of Coverage
      10,500 or less	50
      10,501 to 11,500	49
      11,501 to 12,500	48
      12,501 to 13,500	47
      13,501 to 14,500	46
      14,501 to 15,500	45
      15,501 to 16,500	44
      16,501 to 17,500	43
      17,501 to 18,500	42
      18,501 to 19,999	41

4. In addition, the following rules shall apply to:
   1. any portion of a building that qualifies as a building segment may be treated as a separate building for the purposes of determining the minimum distance required between such building segment and another building or building segment;
   2. where buildings of different heights face each other, the average of the heights of such buildings shall determine the minimum distance required between them;
   3. projections having a maximum height of 25 feet above adjoining grade, a maximum depth of five feet, and an aggregate width not exceeding 25 percent of the building wall from which they project, may penetrate the minimum spacing requirements. However, such projections shall not be permitted in open spaces provided pursuant to paragraph (c)(2) of this Section; and
   4. the obstructions permitted in Section 23-311 shall be permitted in such minimum distance.