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In all districts, as indicated, the minimum horizontal distance between a legally required window opening on an inner court and any wall opposite such window on the same zoning lot shall not be less than 30 feet. However, such provisions shall not apply to small inner courts, the provisions for which are set forth in paragraph (b) of Section 23-851 (Minimum dimensions of inner courts).

Such minimum distance shall be measured in a horizontal plane at the sill level of, and perpendicular to, the legally required window for the full width of the rough window opening, between such window and a projection of such wall onto such horizontal plane.