Code Civ. Proc., § 1174.25

(a) (1) Except as provided in paragraph (2), an occupant who is served with a prejudgment claim of right to possession in accordance with Section 415.46 may file a claim as prescribed in Section 415.46, with the court within 10 days of the date of service of the prejudgment claim of right to possession as shown on the return of service, which period shall include Saturday and Sunday but exclude all other judicial holidays. If the last day for filing the claim falls on a Saturday or Sunday, the filing period shall be extended to and including the next court day. Filing the prejudgment claim of right to possession shall constitute a general appearance for which a fee shall be collected as provided in Section 70614 of the Government Code. Section 68511.3 of the Government Code applies to the prejudgment claim of right to possession.

(2) In an action as described in paragraph (2) of subdivision (e) of Section 415.46, an occupant may file a prejudgment claim of right to possession at any time before judgment is entered.

(b) At the time of filing, the claimant shall be added as a defendant in the action for unlawful detainer and the clerk shall notify the plaintiff that the claimant has been added as a defendant in the action by mailing a copy of the claim filed with the court to the plaintiff with a notation so indicating. The claimant shall answer or otherwise respond to the summons and complaint within five days, including Saturdays and Sundays, but excluding all other judicial holidays, after filing the prejudgment claim of possession. Thereafter, the name of the claimant shall be added to any pleading, filing or form filed in the action for unlawful detainer.