Cal. Gov't Code § 50993

(a) Upon request by the local agency, each short-term rental facilitator shall report, in the form and manner prescribed by the local agency, the physical address, including nine-digit ZIP Code, of each short-term rental during the reporting period.
(b) If the information provided by the short-term rental facilitator pursuant to subdivision (a) is not sufficient for the local agency to identify a specific short-term rental at the provided address, the local agency may request the following:
1. (1) The assessor parcel number of each short-term rental.
2. (2) The URL associated with the specific short-term rental listing.
3. (3) Information exclusively related to the identification of an accessory dwelling unit, guest house, or single unit of a timeshare or multifamily housing project located at a single address, which is located at the address or assessor parcel number requested.
(c) Except as provided in subdivision (d), the reporting period in subdivision (a) may be no more frequently than in intervals of every 3 months within a 12-month period.
(d) The reporting period in subdivision (a) may be monthly if a local agency requires remittance of transient occupancy tax monthly.
(e) A local agency may make the failure of a short-term rental facilitator to report the information required by this section subject to an administrative fine or penalty pursuant to Section 53069.4.