§ 156.06 MAINTENANCE OF INTERIOR OF STRUCTURES.
   (A)    Access and egress.
      (1)    Stairways, escalators, elevators, passageways, and similar means of access between rooms and floors of nonresidential buildings shall be maintained in a safe and sound condition free of obstructions, and capable of providing for the traffic load for proper ingress and egress. They shall be provided in sufficient number and location as to meet the maximum travel distance, fire protection standards, and other provisions of Chapter 150.
      (2)    There shall be at least two continuous flights of stairs extending from the entrance floor to the upper floors. Any door which is used in connection with such means of access and egress shall be provided with a lock which can be opened from the inside without the use of a key.
      (3)    Each occupiable unit shall have available the means of access and egress required by this section without passing through any other unit. When more than one tenant occupies any one floor of a structure, each tenant shall be provided with separate direct means of access and egress to approved exitways.
      (4)    All stairways and entrances which may give access to the structure for employees or for business shall be kept in a good state of repair and structurally sound and properly lighted.
      (5)    Any exterior stairway or entrance used by employees or for business shall be protected from the elements and against decay and rust by periodic application of a weather-coating material or other protective treatment.
   (B)    Structural members. All supporting structural members of all nonresidential buildings shall be kept structurally sound, free of deterioration, and maintained capable of safely bearing the dead and live loads imposed upon them in accordance with Chapter 150.
   (C)    Floors. Floors shall be maintained structurally sound and capable of supporting the imposed loads without undue deflection. They shall be maintained at all times in a condition so as to be smooth, level, clean and free of breaks, cracks, or other unsafe condition.
   (D)    Walls and ceilings. The interior walls and ceilings of all nonresidential structures shall be kept structurally sound, capable of safely supporting the imposed loads upon them, free of cracks and breaks, loose plaster or covering and maintained in a clean, safe, and sanitary manner.
   (E)    Windows, doors, and entrances. All windows, exposed to public view shall be kept clean and in a state of good repair. No storage of materials, stock, or inventory shall be permitted in window display areas or other areas ordinarily exposed to public view unless the areas are first screened from the public view by drapes, venetian blinds, or other permanent rendering of the windows opaque to the public view. All screening of interiors shall be maintained in a clean and in good state of repair.
   (F)    Basements and basement rooms. All basements and basement rooms shall be maintained damp-proof and dry. Floors shall be of concrete and proper drainage provided to prevent back-flooding. Such spaces or rooms where used for the employment of persons shall be provided with sufficient light, ventilation, and sanitation so as not to endanger health and safety.
   (G)    Toilets and lavatories.
      (1)    Every nonresidential building regularly used or occupied by persons shall be provided with toilet and lavatory facilities as further provided in this section, except that small buildings not over 150 square feet in floor area used for shelter in connection with the operation of parking lots, storage lots, kiosk, watchman stations, or similar uses shall not be required to have such facilities if such facilities are otherwise conveniently available to workers using such buildings and are so used at all times.
      (2)    Toilet and lavatory facilities shall be provided according to the requirements of Chapter 150, except that separate facilities for the sexes may not be required in establishments occupied by five or less persons of both sexes taken together and where the facilities are not used by the public. Such facilities shall be located in a space completely enclosed by partitions and self-closing doors separating them from any other room or space. Such toilet rooms shall be provided with adequate light and ventilation.
      (3)    All toilet facilities and toilet rooms shall be kept neat and clean at all times. The toilet room walls and ceilings shall be provided with a smooth surface and where paint is used as the surface coating it must be maintained and painted as is necessary for cleanliness.
      (4)    Floors in such rooms must be of nonabsorbent material such as concrete, brick-tile, vinyl or asphalt tile, or similar surface material.
   (H)    Storage of flammable liquids. All paints, varnish, and other flammable liquids in unsealed cans when kept within the building shall be stored in a safe manner according to the requirements of Chapter 150.
   (I)    Aisle space and exits.
      (1)    In all nonresidential structures used for retail or wholesale business displaying wares to the public on fixtures, counters, tables, or similar means, the minimum aisle space between such display devices shall be not less than 44 inches and shall meet requirements of Chapter 150.
      (2)    In all nonresidential structures there shall be provided proper means of exit from each floor, or occupancy. The number and width of such exits shall meet the requirements of Chapter 150.