Cal. Gov't Code § 65915.3
(a) As used in this section, the following terms have the following meanings:
(2) “Monitoring fee” means a fee charged by a city, county, or city and county on a recurring basis to oversee and ensure the continued affordability of a housing development pursuant to either of the following:
(b) Except as provided in subdivision (d), a city, county, or city and county shall not charge a monitoring fee on a housing development if all of the following conditions are met:
(d) Notwithstanding subdivisions (b) and (c), a city, county, or city and county may charge a monitoring fee on a housing development that meets the criteria of subparagraph (G) of paragraph (1) of subdivision (b) of Section 65915 if any of the following conditions are met: