CAL. CIV. CODE § 1983 : California Code - Section 1983

(a) Where personal property remains on the premises after a tenancy has terminated and the premises have been vacated by the tenant, the landlord shall give written notice to the tenant and to any other person the landlord reasonably believes to be the owner of the property. If the property consists of records, the tenant shall be presumed to be the owner of the records for the purposes of this chapter.

(b) The notice shall describe the property in a manner reasonably adequate to permit the owner of the property to identify it. The notice may describe all or a portion of the property, but the limitation of liability provided by Section 1989 does not protect the landlord from any liability arising from the disposition of property not described in the notice except that a trunk, valise, box, or other container which is locked, fastened, or tied in a manner which deters immediate access to its contents may be described as such without describing its contents. The notice shall advise the person to be notified that reasonable costs of storage 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, if mailed, not less than 18 days after the notice is deposited in the mail.

(c) The notice shall be personally delivered to the person to be notified or sent by first-class mail, postage prepaid, to the person to be notified at his or her last known address and, if there is reason to believe that the notice sent to that address will not be received by that person, also to any other address known to the landlord where the person may reasonably be expected to receive the notice. If the notice is sent by mail to the former tenant, one copy shall be sent to the premises vacated by the tenant. If the former tenant provided the landlord with the tenant's email address, the landlord may also send the notice by email.