Cal. Civ. Code § 7-218

(a) (1) A designated household may terminate an extended lease at any time by giving written notice to the landlord:

(i) at least 1 month in advance, if less than 12 months remain on the lease; or

(ii) at least 3 months in advance, if 12 months or more remain on the lease.

(2) An extended lease for a designated household under this subtitle shall include the termination provisions of this section.

(b) The extended tenancy of a designated household ends:

(1) 90 days after the last member of the assisted household who lived in the unit on the date of the notice of intent dies or moves from the unit;

(2) on eviction for failure to pay rent or for violation of another material term of the extended lease; or

(3) on voluntary termination by the designated household under subsection (a) of this section.