§ 103. Lighting and ventilation of rooms. 1. Except as in this section and in sections one hundred five, one hundred seventy-one and articles three and four otherwise expressly provided, every living room shall have at least one window opening directly upon a street, yard or court upon the same lot as that occupied by the dwelling in which such room is situated.

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2. Nothing in this section shall be construed as prohibiting the windows of any room from opening on a partially-enclosed terrace provided such terrace opens directly to a street, yard or court and the area of the front of the terrace which is open to the outer air is at least equal to seventy-five per centum of the floor surface area of the terrace.

3. No required window shall open upon any offset or recess less than six feet in width except a window of a water-closet compartment, bathroom, or stair or of a kitchenette.

4. The total window area in every living room shall be at least one-tenth of the floor surface area of such room.