A rental unit must be fit to live in; that is, it must be habitable. In legal terms, "habitable" means that the rental unit is fit for occupation by human beings and that it substantially complies with state and local building and health codes that materially affect tenants' health and safety.
California law makes landlords and tenants each responsible for certain kinds of repairs, although landlords ultimately are legally responsible for assuring that their rental units are habitable.
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