15-23 Light and Air Provisions
(a) Every dwelling unit shall meet the light and air requirements of Section 277 of the Multiple Dwelling Law.
(b) Mezzanines shall be lit and ventilated in accordance with the provisions of Section 27-732 (Natural light requirements) and Article 6 (Standard of Natural Ventilation) of the New York City Building Code.
(c) Width to depth ratio
Where there is more than one dwelling unit per story, the average width of each dwelling unit shall be at least one-fourth of the depth. Depth is the farthest point within the dwelling unit from the exterior building wall containing windows used to meet the requirements of paragraph (a) of this Section, measured perpendicular to such building wall. Width is the distance between exterior dwelling unit walls measured perpendicular to the depth.