For covered units, once a tenant has lived there 12+ months the landlord needs a legally recognized 'just cause' to end the tenancy — either 'at-fault' (e.g., nonpayment, lease violation) or 'no-fault' (e.g., owner move-in, withdrawal from rental market).
Civil Code §1946.2 requires just cause to terminate a tenancy after the tenant has occupied the unit for 12 months (or 24 months in some shared situations). 'At-fault' causes include failure to pay rent, material lease breach, nuisance, criminal activity, and refusal to sign a similar renewal. 'No-fault' causes include the owner or close family moving in, permanent removal of the unit from the market (Ellis Act), demolition/substantial remodel, or compliance with a government order. For no-fault terminations, the landlord must provide relocation assistance (see that article). Improper or retaliatory terminations are unlawful.
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