CA Civ Proc Code Section 1089.5

Where a petition for writ of mandate is filed in the trial court pursuant to Section 1088.5, and where a record of the proceedings to be reviewed has been filed with the petition or where no record of a proceeding is required, the respondent shall answer or otherwise respond within 30 days after service of the petition. However, where a record of the proceeding to be reviewed has been requested pursuant to Section 11523 of the Government Code, or otherwise, and has not been filed with the petition, the party upon whom the petition has been served, including any real party in interest, shall answer or otherwise respond within 30 days following receipt of a copy of the record.