The height of all buildings or other structures in Special Mixed Use Districts shall be measured from the base plane.

In Special Mixed Use Districts where the designated Residence District is an R3, R4 or R5 District, the provisions of Section 123-661 (Mixed use buildings in Special Mixed Use Districts with R3, R4 or R5 District designations) shall apply. On waterfront blocks, as defined in Section 62-11, where the designated Residence District is R3, R4 or R5, the height and setback regulations of Section 62-34, inclusive, shall apply to buildings and other structures, except that for mixed use buildings, the height and setback regulations set forth in Section 123-661 shall apply.

In Special Mixed Use Districts where the designated Residence District is an R6 through R10 District, the provisions of Section 123-662 (All buildings in Special Mixed Use Districts with R6, R7, R8, R9 and R10 District designations) shall apply. However, in certain zoning districts in certain Special Mixed Use Districts, such provisions are modified by the special rules of Section 123-663 (Special rules for certain districts in certain Special Mixed Use Districts).

For any zoning lot located in a Historic District designated by the Landmarks Preservation Commission, the minimum base height of a street wall may vary between the height of the street wall of an adjacent building before setback, if such height is lower than the minimum base height required, up to the minimum base height requirements of this Chapter.