Cal. Code of Civil Procedure § 715.020

To execute the writ of possession of real property: (a) The levying officer shall serve a copy of the writ of possession on one occupant of the property. Service on the occupant shall be made by leaving the copy of the writ with the occupant personally or, in the occupant’s absence, with a person of suitable age and discretion found upon the property when service is attempted who is either an employee or agent of the occupant or a member of the occupant’s household. (b) If unable to serve an occupant described in subdivision (a) at the time service is attempted, the levying officer shall execute the writ of possession by posting a copy of the writ in a conspicuous place on the property and serving a copy of the writ of possession on the judgment debtor. Service shall be made personally or by mail. If the judgment debtor’s address is not known, the copy of the writ may be served by mailing it to the address of the property. (c) If the judgment debtor, members of the judgment debtor’s household, and any other occupants holding under the judgment debtor do not vacate the property within five days from the date of service on an occupant pursuant to subdivision (a) or on the judgment debtor pursuant to subdivision (b), the levying officer shall remove the occupants from the property and place the judgment creditor in possession. The provisions of Section 684.120 extending time do not apply to the five-day period specified in this subdivision. (d) Notwithstanding subdivision (c), unless the person is named in the writ, the levying officer may not remove any person from the property who claims a right to possession of the property accruing prior to the commencement of the unlawful detainer action or who claims to have been in possession of the property on the date of the filing of the unlawful detainer action. However, if the summons, complaint, and prejudgment claim of right to possession were served upon the occupants in accordance with Section 415.46, no occupant of the premises, whether or not the occupant is named in the judgment for possession, may object to the enforcement of the judgment as prescribed in Section 1174.3.