Buildings used or occupied for residential use, as defined and
classified in this Part 1, shall conform to the use, occupancy, size,
light, ventilation, vertical travel, exit and egress requirements,
to provide for a safe and healthful environment.
Buildings, for the purpose of this Part 1, shall be classified
in respect to their uses or occupancies as follows:
A. One-and two-family dwellings.
B. Multiple dwellings:
(1) Apartment houses and apartment hotels.
(2) Hotels, motels and boatels.
(3) Lodging houses, rooming houses and boardinghouses.
(4) Clubs, dormitories and fraternity and sorority houses.
C. Mixed-occupancy buildings.
(1) Residential and accessory use parts shall be classified as multiple
dwellings.
(2) Nonresidential parts shall be classified in accordance with their
occupancy and use under the Uniform Code. Components of such parts,
including, but not limited to, structural elements, mechanical and
electrical service equipment, and fire-protection equipment, shall
be subject to applicable provisions of this Part 1 and generally accepted
standards of engineering and fire-protection practice, so as to ensure
the health, safety, and welfare of the residential occupants of the
building.
Elevators and escalators shall be maintained in good and safe
operating condition and adequately lighted at all times.