The maximum number of dwelling units permitted shall be determined in accordance with the applicable district regulations pursuant to Section 23-50 (DENSITY REGULATIONS), inclusive. Any floor area in excess of the district regulations shall be included in the amount of floor area to be divided by the dwelling unit factor, where applicable.

For the conversion of non-residential floor area to residences, pursuant to Section 74-71 (Landmark Preservation), in C7, C8 and Manufacturing Districts, the maximum number of dwelling units shall be determined by applying the density regulations set forth in Section 23-50 in accordance with the applicable geography.

In addition, the following provisions shall apply:

Dwelling units may be distributed anywhere within a building provided that any portion of a dwelling unit located in a cellar shall also comply with the provisions of Section 15-112 (Light and air provisions).

Mezzanines constructed pursuant to Chapter 26 of the Administrative Code shall be allowed within individual dwelling units provided that the gross area of such mezzanine does not exceed 33 1/3 percent of the floor area contained within such dwelling unit. Such mezzanines are permitted only in buildings with an existing floor area ratio of 12 or less, and only between floors, or between a floor and a roof, existing on January 22, 1998, that are to remain. Such mezzanines shall not be included as floor area for the purpose of calculating the minimum required size of a dwelling unit or for calculating floor area devoted to dwelling units.

The density provisions of this Section may be replaced by the regulations of Section 15-024 (Special bulk regulations for certain pre-existing dwelling units and joint living-work quarters for artists) for dwelling units that are registered Interim Multiple Dwellings or are covered by the New York City Loft Board pursuant to Article 7C of the New York State Multiple Dwelling Law or that the Loft Board determines were occupied for residential use on September 1, 1980.