California Code, Business and Professions Code - BPC § 21712.3

(a)(1) The owner shall give written notice to the occupant prior to the termination or nonrenewal of the rental agreement.

(2) The notice shall include a statement that the occupant may minimize the costs of storage by claiming any property remaining at the self-service storage facility within two days after the end of the rental agreement, and that the property may be sold, kept, destroyed, or disposed of if it is not claimed within the time period described in paragraph (2) of subdivision (b).

(b)(1) Where personal property remains at the self-service storage facility after the rental agreement has ended, the owner shall give written notice to the former occupant.

(2) The notice shall describe the property in a manner reasonably adequate to permit the former occupant to identify it.  The notice shall advise the former occupant that rent may be charged before the property is returned, where the property may be claimed, and the date before which the claim must be made.  The date specified in the notice shall be a date not less than 15 days after the notice is personally delivered or emailed, or, if mailed, not less than 18 days after the notice is deposited in the mail.

(3) The notice shall be personally delivered to the former occupant or sent by first-class mail, postage prepaid, to the last known address of the former occupant and to the alternative address specified in subdivision (b) of Section 21712, or by email pursuant to subdivision (c) of Section 21712.