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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, shall not be considered obstructions when located within 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:

(a)        Energy infrastructure equipment and accessory mechanical equipment, subject to the requirements set forth in Section 23-442;

(b)        Fences;

(c)        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 courts;

Fire escapes in outer court recesses, not more than five feet in depth;

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;

(d)        Recreational or yard drying equipment;

(e)        Steps.

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 24-51 (Permitted Obstructions), shall be permitted.