(

a) In lieu of personal delivery of a copy of the summons and 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 complaint during usual office hours in the person’s office or, if no physical address is known, at the person’s usual mailing address, other than a United States Postal Service post office box, with the person who is apparently in charge thereof, and by thereafter mailing a copy of the summons and complaint by first-class mail, postage prepaid to the person to be served at the place where a copy of the summons and complaint were left.

When service is effected by leaving a copy of the summons and complaint at a mailing address, it shall be left with a person at least years of age, who shall be informed of the contents thereof. Service of a summons in this manner is deemed complete on the 10th day after the mailing. (

b) If a copy of the summons and 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 complaint at the person’s 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 their office, place of business, or usual mailing address other than a United States Postal Service post office box, at least 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 complaint were left.

Service of a summons in this manner is deemed complete on the 10th day after the mailing. (

c) Notwithstanding subdivision (b), if the only address reasonably known for the person to be served is a private mailbox obtained through a commercial mail receiving agency, service of process may be effected on the first delivery attempt by leaving a copy of the summons and complaint with the commercial mail receiving agency in the manner described in subdivision (

d) of

Section 17538.5 of the Business and Professions Code. (

d) This

section shall remain in effect only until January 1, 2027, and as of that date is repealed.