Every dwelling unit shall contain at least 150 square feet of habitable
area for one occupant, and 100 square feet for each additional person. The
floor area shall be calculated only on the basis of the total area of all
habitable rooms.
The ceiling height of any habitable room shall be at least six feet
six inches, except that in any habitable room with a sloping ceiling where
at least 1/2 of the floor area shall have a ceiling height of at least six
feet six inches. The floor area of that part of such a room where the ceiling
height is less than five feet shall not be considered as part of the floor
area in computing the total floor area of the room for the purpose of determining
the maximum permissible occupancy.