Cal. Gov't Code § 50995

(a) A local agency may conduct an audit or otherwise examine the records of the short-term rental facilitator documenting the receipt of the transient occupancy tax due and payable to the local agency if the short-term rental facilitator is responsible for collecting and remitting the transient occupancy tax to the local agency pursuant to a local ordinance or collection agreement.
(b) Any costs associated with an audit or examination shall be paid for by the local agency.