The owner of the premises shall maintain the structures and exterior property in compliance with these requirements, except as otherwise provided for in this Code. A person shall not occupy as owner-occupant or permit another person to occupy premises which are not in a sanitary and safe condition, and which do not comply with the requirements of this Chapter. Occupants of a dwelling unit, rooming unit or housekeeping unit are responsible for keeping in a clean, sanitary and safe condition that part of the dwelling unit, rooming unit, housekeeping unit or premises which they occupy and control. (301.2)