Gov. Code, § 51946

Notwithstanding any provision to the contrary in Chapter 1.5 (commencing with Section 2161), Part 4, Division 1, of the Revenue and Taxation Code, the charter shall contain provisions either establishing a limitation on the combined ad valorem property tax rate and increases in such tax rate which may be levied by the city-county and reorganized local jurisdictions under said charter or establishing a method to limit such combined ad valorem property tax rate or increases in such tax rate, to the extent that the California Constitution or state law applicable to the city-county from time to time may require such a limitation on the ad valorem property tax rate and increases in such rate by the city-county.