R1 R2 R3 R4 R5 R6 R7 R8 R9 R10

In all districts, as indicated, except as otherwise provided in Section 23-862 (Minimum distance between legally required windows and lot lines on small corner lots in R9 or R10 Districts) or Section 23-863 (Minimum distance between legally required windows and any wall in an inner court), the minimum distance between a legally required window and:

1. any wall;
2. a rear lot line, or vertical projection thereof; or
3. a side lot line, or vertical projection thereof;

shall be 30 feet, measured in a horizontal plane at the sill level of, and perpendicular to, such window for the full width of the rough window opening; provided, however, that a legally required window may open on any outer court meeting the requirements of Section 23-84 (Outer Court Regulations), except for small outer courts in R6 through R10 Districts, the provisions for which are set forth in paragraph (b) of Section 23-841 (Narrow outer courts).

The obstructions permitted for any yard set forth in paragraph (a) of Section 23-441 (General permitted obstruction allowances), shall be permitted in such minimum distance.

However, for shallow interior lots in R6 through R10 Districts, the minimum distance between a legally required window and a rear lot line, or vertical projection thereof, may be reduced to equal the rear yard depth required pursuant to the provisions of Section 23-52 (Special Provisions for Shallow Interior Lots). However, in no event shall such minimum distance between a legally required window and a rear lot line, or vertical projection thereof, be less than 20 feet.

In R3, R4 and R5 Districts, the minimum dimension between a legally required window and a side lot line shall be 15 feet. Such 15 foot dimension shall be measured in a horizontal plane perpendicular to the side lot line or vertical projection thereof. Furthermore, such area with a 15 foot dimension shall be open to the sky from ground level up for the entire length of the side lot line. Only accessory mechanical equipment limited in depth to 18 inches from an exterior wall, chimneys, downspouts, eaves, gutters, open accessory off-street parking spaces, qualifying exterior wall thickness, ramps for access by the handicapped, and steps shall be permitted obstructions in such open area, subject to the conditions set forth in of Section 23-44 (Permitted Obstructions in Required Yards or Rear Yard Equivalents), provided that such obstructions, not including qualifying exterior wall thickness and accessory mechanical equipment, will not reduce the minimum width of the open area by more than three feet.