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In all districts, as indicated, at any level at which two portions of a single building or abutting buildings on a single zoning lot are not connected one to the other, such portions shall be deemed to be two separate buildings, and the provisions set forth in Section 23-71 (Minimum Distance Between Buildings on a Single Zoning Lot) shall apply. In applying such provisions, the height of the two portions shall be measured from the roof of the connecting portion of such building instead of from the base plane or curb level, as applicable.