§ 63. Sub-curb uses. 1. When any living room is below the level of the
highest curb in front of any multiple dwelling erected after April
eighteenth, nineteen hundred twenty-nine, in accordance with the
provisions of paragraph f of subdivision one of section thirty-four, all
portions of such dwelling below such level shall be fireproof throughout
except that windows therein need not be fireproof but shall be of
incombustible material and may be glazed with plain glass.

2. Except in multiple dwellings which do not exceed eighty feet in
height measured from the lowest point of any curb on which any part of
the dwelling faces, at least one means of egress from any apartment or
suite of rooms below the level of the highest curb in front of such a
dwelling shall lead directly to the street in front of said dwelling and
at least one such means to the yard or street in the rear of said
dwelling. Every yard in the rear of every such multiple dwelling,
regardless of the height of such dwelling, shall at the lowest level of
such yard be provided with a fire passage in compliance with the
requirements for such a passage in paragraph f of subdivision five of
section twenty-six.

3. Notwithstanding any other provisions of this section the department
may require such additional means of egress from the said dwelling or
protection from fire as the department may deem necessary for the safety
of the occupants.