In C1-8, C1-9, C2-7 or C2-8 Districts or in C1 or C2 Districts mapped within R9 or R10 Districts, for buildings that do not meet the criteria set forth in paragraphs (b)(1) and (b)(2) of Section 23-441 (Special tower provisions), and in other Commercial Districts mapped within, or with a residential equivalent of R9 or R10 Districts, when a mixed building is subject to tower regulations, the following shall apply:

1. where not more than two stories of a mixed building are occupied by non-residential uses, the tower regulations of Section 23-737 shall apply; and
2. for other mixed buildings, the tower regulations of Section 33-45 shall apply.