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In all districts, as indicated, the obstructions permitted for any yard set forth in paragraph (a) of Section 23-441 (General permitted obstruction allowances), as well as the following obstructions shall be permitted within the minimum area and dimensions needed to satisfy the requirements for a court . For the purposes of applying such allowances to courts, all percentage calculations shall be applied to the area of the court instead of the yard:

1. Fences
2. Fire escapes in outer courts;
   
   Fire escapes in outer court recesses not more than five feet in depth;
   
   Fire escapes in inner courts where such fire escapes are required as a result of alterations in buildings existing before December 15, 1961;
   
   Fire escapes in outer court recesses more than five feet in depth where such fire escapes are required as a result of alterations in buildings existing before December 15, 1961;
3. Energy infrastructure equipment and accessory mechanical equipment, subject to the requirements set forth in Section 23-442;
4. Recreational or drying yard equipment;

In addition, for courts at a level higher than the first story, decks, skylights, parapet walls, roof thickness, solar energy systems up to four feet high, vegetated roofs, and weirs, as set forth in Section 23-62 (Permitted Obstructions), shall be permitted.