§ 1009.20 EXTERIOR PROPERTY AREAS.
   (1)   Compliance. No person shall occupy as owner-occupant or let to another for occupancy any dwelling unit, multiple dwelling, rooming house, rooming unit or portion thereof for the purpose of living, sleeping, cooking or eating therein which does not comply with the provisions of this division.
   (2)   Sanitation. All exterior property areas shall be maintained in a clean and sanitary condition free from any accumulation of rubbish or garbage.
   (3)   Grading and drainage. All premises shall be graded and maintained to prevent the accumulation of stagnant water on the premises or within any building or structure located thereon.
   (4)   Noxious weeds. All exterior property areas shall be kept free from species of weeds or plant growth that are noxious or detrimental to the public health.
   (5)    Insect and rodent harborage.
      (a)   Every owner and occupant of a structure containing two or more dwelling units shall be responsible for the extermination of insects, rodents, vermin or other pests in all exterior areas of the premises. The owner shall be responsible for extermination when infestation exists in the shared or public parts of the premises.
      (b)   In the case of a single-family structure, the occupant shall be responsible for the extermination of insects, rodents and vermin in all exterior property areas.
   (6)   Accessory structures. All accessory structures including detached garages shall be maintained, structurally sound and in good repair.
   (7)   Unoccupied structure. The owner of every unoccupied dwelling or multiple dwelling shall be responsible for the maintenance of exterior property areas required under this division.