No licensee or employee of a licensee shall enter any private building or portion thereof, excepting premises open to the public, without the consent of the owner or the person in legal possession thereof. A violation of this section may result in a fine of twenty-five dollars ($25) for the first violation and one hundred dollars ($100) for each subsequent violation.
Source:
Section 7599.45, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=7599.45..