CA Gov't Code Section 13995.108

(a)

The county may require assessed businesses to maintain books and records that reflect their income or sales as reflected in the assessment, and to furnish the county treasurer/tax collector with any information that may, from time to time, be requested by the treasurer/tax collector, and to permit the inspection by the treasurer/tax collector of portions of books and records that relate to the amount of assessment.

(b)

Information pertaining to assessed businesses obtained by the county treasurer/tax collector pursuant to this chapter shall be confidential and shall not be disclosed except to a person with authority to obtain the information, any attorney hired by the county treasurer/tax collector who is employed to give legal advice upon that information, or by court order.

(c)

Information obtained by the county treasurer/tax collector in order to determine the assessment level for an assessed business shall be exempt from the California Public Records Act (Chapter 3.5 (commencing with Section 6250) of Division 7 of Title 1).