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In the districts indicated, for a residential portion of a mixed building, the required residential rear yard shall be provided at the floor level of the lowest story used for dwelling units or rooming units, where any window of such dwelling units or rooming units faces onto such rear yard. If the level of such yard is at or higher than the first story, decks, parapet walls, roof thickness, solar energy systems up to four feet high, vegetated roofs, and weirs, shall be permitted, pursuant to Section 23-62 (Permitted Obstructions).