§ 150.20  SPACE, USE AND LOCATION.
   No person shall occupy or let to another for occupancy any dwelling or dwelling unit, for the purpose of living therein, which does not comply with the following requirements.
   (A)   Required space in dwelling units.
      (1)   Every dwelling unit shall contain a minimum gross floor area of not less than 150 square feet for the first occupant and 100 square feet for each additional occupant.
      (2)   The living or principal room shall contain not less than 150 square feet; the first bedroom shall contain not less than 100 square feet; and all other bedrooms, if any, shall contain not less than 70 square feet each. The above floor areas shall be calculated only for habitable rooms.
   (B)   Height of ceiling. At least one-half of the floor area of every habitable room shall have a ceiling height of at least seven and one-half feet; and the floor area of that part of any 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 thereof.
   (C)   Access to bath and bedrooms. No dwelling or dwelling unit constructed after adoption of this chapter, containing two or more sleeping rooms, shall have the room arrangements that access to bathroom or water closet compartment intended for use by occupant of more than one sleeping room can be had only by going through another sleeping room; nor shall room arrangements be such that access to a sleeping room can be had only by going through another sleeping room or a bathroom or water closet compartment.
   (D)   Cellars. No cellar space shall be used as a habitable room or dwelling unit, except as noted in § 150.18(A).
   (E)   Basement. No basement space shall be used as a habitable room or dwelling unit, unless:
      (1)   The floor and walls are impervious to leakage of underground and surface runoff water;
      (2)   The total of window area in each room is equal to at least the minimum window area sizes in § 150.18(A), except as provided in division (E)(5) below;
      (3)   The required minimum window area is located entirely above the grade of the ground adjoining the window area;
      (4)   The total of openable window area in each room is equal to at least the minimum as required under § 150.18(B), except where there is supplied some other device affording adequate ventilation and approved by the Building Inspector; and
      (5)   Recreation rooms, utility rooms and workshops need not have the required window area if they are properly lighted by electricity and ventilated by mechanical or other means approved by the Building Inspector.
   (F)   Access limitation of dwelling units to commercial uses. No habitable room, bathroom or water closet compartment which is accessory to a dwelling unit shall open directly into or shall be used in conjunction with a food store, barber or beauty shop, doctor’s or dentist’s examination or treatment room, or similar room used for public purposes.
(1973 Code, § K-5)