§ 151. Spaces under stairs. 1. It shall be unlawful to have a closet
of any kind under any public stair.

2. The space beneath every stair from the foot of the stair to a point
where the soffit is four feet or more above the floor shall be entirely
enclosed with unpierced fire-retarded partitions. Such enclosure beneath
a flight of public stairs leading from the entrance story to the story
next above shall be fireproof.

3. Any unenclosed portion of the space beneath a flight of public
stairs leading from the entrance story to the story next above shall be
left entirely open and kept clear and free from encumbrance.