Preliminary lien and Lien Notices via email in California

If any part of the rent or other charges due from an
occupant remain unpaid for 14 consecutive days, an owner may
terminate the right of the occupant to the use of the storage space
at a self-service storage facility by sending a notice to the
occupant's last known address and to the alternative address
specified in subdivision (b) of Section 21712.  The notice shall be
sent by certified mail, postage prepaid, or by regular first-class
mail if the owner obtains a certificate of mailing indicating the
date the notice was mailed.