Section 4

Section 4. No room (other than basement-rooms, provision for which is made in section two of this amendment) in any tenement- house thereafter to be erected or constructed, or altered into a tenement-house, shall be leased or occupied for living purposes, unless it contains at least one window having a superficial area of not less than one-tenth of the floor area of the room, which window opens upon a street or alley, or upon a yard or court, having a sectional area of less than one hundred square feet; and no room shall be so leased or occupied in any now existing tenement-house, unless it contains a window of the foregoing dimensions, opening upon a street or alley or upon a yard or court having a sectional area of less than twenty-five square feet; or unless such room adjoins another room in the same apartment, which other room has such a window, opening upon such a street, alley, yard or court, and between which two adjoining rooms there is a sash-window having at least fifteen square feet of glazed surface, the upper half of which is made to open easily.