§ 151.18  MINIMUM SPACE, USE, AND LOCATION REQUIREMENTS.
   (A)   Every dwelling unit shall contain at least 150 feet of floor space for the first occupant, and at least 100 additional square feet of floor space for each additional occupant, the floor spaces to be calculated on the basis of the total allowable habitable floor area of the room.
   (B)   In every dwelling unit of two or more rooms, every room occupied for sleeping purposes by one occupant shall contain at least 70 square feet of floor space and every room occupied for sleeping purposes by more than one person shall contain at least 50 square feet of floor space for each occupant, except for children under the age of seven years sleeping rooms may contain 35 feet of floor space per child.
   (C)   No dwelling of dwelling unit containing two or more sleeping rooms shall have such room arrangements that access to a bathroom or water closet intended for use by occupants of both rooms is such that the occupants of one room must go through the other sleeping room.
   (D)   At least one-half of the floor area of every habitable room shall have a ceiling height of at least seven fee; and the floor area of that part of any room where the ceiling is less than five feet shall not be considered a part of the floor area in computing the total area of the room for the purposes of determining the maximum permissible occupancy thereof. 
   (E)   No basement or cellar shall be used as a habitable room or dwelling unit unless:  the floors and walls are impervious to leakage of underground and surface water runoff, and are insulated against dampness; the total window area in each room is equal to at least the minimum window area sizes as required in § 151.17 (A) of this chapter; the required minimum window area is located entirely above the grade of the ground adjoining the window area, and the total of openable window area of each room is equal to at least the minimum as required by § 151.17 (B) of this chapter except where there is supplied some other device affording adequate ventilation and approved by the Building Inspector; there are adequate exits as required by state and city laws and regulations.
('76 Code, § 210.11(E))  Penalty, see § 151.99