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In all districts, as indicated, legally required windows in portions of buildings used for residential use shall be subject to the provisions set forth in Section 23-86 (Minimum Distance Between Legally Required Windows and Walls or Lot Lines). The provisions of Section 23-863 (Minimum distance between legally required windows and any wall in an inner court) shall also apply to a legally required window opposite a wall of any other building on the same zoning lot.

For the purposes of this Section, at any level at which two portions of a single building are not connected one to the other, such portions shall be deemed to be two separate buildings and shall be subject to the provisions of Section 23-863.