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In all districts, as indicated, the minimum horizontal distance between a required window opening on an #inner court# and any wall opposite such window on the same #zoning lot# or between a required window and any wall of any other #building# opposite such window on the same #zoning lot#, shall not be less than 20 feet, nor shall any such wall be nearer to such window than a distance equal to one-third the total height of such wall above the sill level of such window. Such minimum distance need not exceed 40 feet.
Such minimum distance shall be measured in a horizontal plane at the sill level of, and perpendicular to, the required window for the full width of the rough window opening between such window and a projection of such wall onto such horizontal plane.
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 this Section.