In Special Mixed Use Districts where the Residence District designation is an R3, R4 or R5 District, the maximum base height and maximum building height for qualifying residential sites shall be as set forth in the following table. For all qualifying residential sites in the Greater Transit Zone, the height and setback provisions applicable to an R5 District shall apply.

For building street walls fronting a street where either a Commercial District or a Special Mixed Use District is mapped along the entire block frontage, for the portion of such street wall that exceeds the maximum base height, a setback shall be provided in accordance with the provisions of Section 23-423. Such setback shall be provided at a height not lower than a minimum base height of 20 feet and not higher than the maximum base height set forth in the following table. 

MAXIMUM BASE HEIGHT AND MAXIMUM BUILDING HEIGHTS

Permitted obstructions shall be permitted pursuant to Sections 23-41, 24-51 or 43-42. In addition, for all buildings or other structures, a dormer may be provided in accordance with the provisions of paragraph (b)(1) of Section 23-413 (Permitted obstructions in certain districts).

However, for M1 Districts with an A suffix paired with a Residence District, the applicable height and setback regulations shall be whichever regulations permit the tallest overall heights between the applicable Manufacturing District regulations set forth in Section 43-46, or the applicable Residence District regulations set forth in this Section, depending on the particular M1 District and Residence District pairing.

Additional height and setback provisions are set forth in Section 123-66, inclusive.

The height of all buildings or other structures shall be measured from the base plane. For the purposes of this Section, where base planes of different elevations apply to different portions of a building or other structure, each such portion of the building may be considered to be a separate building.