Front wall recesses for architectural or decorative purposes are permitted, except in an arcade required in Section 84-134 (Mandatory arcades), provided that below the level of the second story ceiling the depth of such recess does not exceed 20 feet. At any story above the level of the second story ceiling, recesses to the amount of 25 percent of the aggregate area of the wall at each story are permitted, provided the depth of any such recess does not exceed 10 feet. All recesses shall be subject to the applicable provisions of Section 23-84 (Outer Court Regulations).