In C6-2M, C6-4M, M1-5M and M1-6M Districts, the conversion of floor area to residences in existing buildings, or portions thereof is permitted subject to the certification by the Chairperson of the City Planning Commission that floor area has been preserved for commercial or manufacturing uses in accordance with the provisions of this Section. For the purposes of this Section only, the following mixed-use areas are defined:

Southeast Chelsea — All C6-2M, C6-4M, M1-5M and M1-6M Districts between 13th Street and 23rd Street, and between Park Avenue and Eighth Avenue.

Garment Center East — The C6-4M District located between West 34th Street and West 35th Street, and between Seventh Avenue and Eighth Avenue.