Cal. Civil Code § 3080.05

(a) If a defendant desires to oppose the issuance of an order authorizing sale the defendant shall file and serve upon the lienholder a notice of opposition no later than three days prior to the date set for hearing. The notice shall: (1) State the grounds upon which the defendant opposes the order; (2) Be accompanied by an affidavit or affidavits supporting any factual issues raised; (3) State whether the defendant is prepared to file an undertaking as provided in Section 3080.11; and (4) If the defendant is prepared to file an undertaking, include an estimate of the amount of such undertaking as set forth in Section 3080.09 and the defendant’s basis for the estimate. (b) Except when the lienholder has made an ex parte application for an order as set forth in Section 3080.15, or for good cause shown, a defendant shall not be permitted to oppose the issuance of an order if it has failed to file a notice of opposition within the time prescribed.