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In the districts indicated, when mapped within an R7-2, R8, R9 or R10 District, the provisions set forth in Section 33-451 (In certain specified Commercial Districts) shall apply to any community facility building. If a building is used for both community facility and commercial uses, no portion of such building occupied by commercial use shall penetrate the sky exposure plane as set forth in Sections 33-43 (Maximum Height of Walls and Required Setbacks) or 33-44 (Alternate Front Setbacks).