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In all districts, as indicated, except as otherwise provided in Section 24-652 (Minimum distance between required windows and certain walls), the minimum distance between any required windows and:
(a) any wall;
(b) a rear lot line, or vertical projection thereof; or
(c) a side lot line, or vertical projection thereof;
shall be 20 feet, measured in a horizontal plane at the sill level of, and perpendicular to, such window; provided, however, that a required window may open on any outer court meeting the requirements of Section 24-63 (Outer Court Regulations).