N.Y. Multiple Residence Law § 130: Entrance halls

§ 130. Entrance halls. Every entrance hall shall be at least three

feet eight inches in clear width from the entrance to the first stair.

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

stairs, the 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.