Par. 1. - In every tenement house hereafter erected covering a superficial area of more than seventeen hundred and fifty square feet, the aggregate area of windows to light or ventilate stair halls on each floor shall be at least fifteen square feet: provided, however, that when therless. shall be, within the space enclosed by the stairway its landings, from the second story upward, an open for light and ventilation whose least horizontal dimeja shall be equal to the width of the stairs, but in no case less than three feet, then the windows required in sections sixty-five and sixty-six may be omitted.

[1921, c. 289, sect. 16.]

Skylight over Stair Well

Par. 2. - There shall be in the roof, directly over each stair well, in all tenement houses hereafter erected, without windows as above provided, a ventilating skylight provided with ridge ventilators, having a minimum opening of forty square inches, or else such skylights shall be provided with fixed or movable louvres. The glazed roof of the skylight shall not be less than twenty square feet in area.

Section 67. Privacy

Water-closets

Par. 1. - In every apartment of four or more rooms in a tenement house hereafter erected, at least one water-closet compartment shall be accessible without passing through any bedroom.