In lieu of personal delivery of a copy of the summons and of the complaint to the person to be served as specified in Section 416.10, 416.20, 416. 30, 416.40, or 416.50, a summons may be served by leaving a copy of the summons and of the complaint during usual office hours in his or her office with the person who is apparently in charge thereof, and by thereafter mailing a copy of the summons and of the complaint (by first-class mail, postage prepaid) to the person to be served at the place where a copy of the summons and of the complaint were left. Service of a summons in this manner is deemed complete on the 10th day after such mailing.
If a copy of the summons and of the complaint cannot with reasonable diligence be personally delivered to the person to be served as specified in Section 416.60, 416.70, 416.80, or 416.90, a summons may be served by leaving a copy of the summons and of the complaint at such persons dwelling house, usual place of abode, usual place of business, or usual mailing address other than a United States Postal Service post office box, in the presence of a competent member of the household or a person apparently in charge of his or her office, place of business, or usual mailing address other than a United States Postal Service post office box, at least 18 years of age, who shall be informed of the contents thereof, and by thereafter mailing a copy of the summons and of the complaint (by first-class mail, postage prepaid) to the person to be served at the place where a copy of the summons and of the complaint were left. Service of a summons in this manner is deemed complete on the 10th day after the mailing. (Amended by Stats. 1989, Ch. 1416, Sec. 15.)