N.Y. Multiple Dwelling Law § 50: Entrance halls

§ 50. Entrance halls. Every entrance hall in every multiple dwelling

erected after April eighteenth, nineteen hundred twenty-nine, shall be

at least four feet in clear width from the entrance to the first stair,

and beyond that shall be at least three feet eight inches in clear

width. If such an entrance hall is the only entrance to more than one

flight of stairs, the required width of such hall shall be increased in

every part, for each such additional flight of stairs, by one-half the

width required for one flight of stairs.