Cal. CCP § 415.47

(a) Where the lessee has given the lessor written notice of the lessee’s intent not to abandon leased real property as provided in Section 1951.3 of the Civil Code, the summons in an action for unlawful detainer of the real property may be served on the lessee by certified mail, postage prepaid, addressed to the lessee at the address stated in the lessee’s notice of intent not to abandon if such summons is deposited in the mail within 60 days from the date the lessee’s notice of intent not to abandon is received by the lessor. Service in this manner is deemed completed on the 10th day after such mailing.

(b) Where the lessee has given the lessor written notice of the lessee’s intent not to abandon leased real property as provided in Section 1951.3 of the Civil Code, but failed to include in such notice an address at which the lessee may be served by certified mail in any action for unlawful detainer of the real property, the summons in an action for unlawful detainer of the real property may be served on the lessee by certified mail, postage prepaid, addressed to the lessee at (1) the same address or addresses to which the lessor’s notice of belief of abandonment was addressed if that notice was given by mail or (2) the address of the real property if the lessor’s notice of belief of abandonment was personally served on the lessee. Service may not be made pursuant to this subdivision unless the summons is deposited in the mail within 60 days from the date the lessee’s notice of intent not to abandon is received by the lessor. Service in the manner authorized by this subdivision is deemed completed on the 10th day after such mailing.

(c) This section provides an alternative method of service on the lessee and does not preclude service in any other manner authorized by this chapter.