Your best bet would be to check on the individual property at the county tax assessors office.
If you want an agent to see you can call your favorite agent Harold @ 951-821-8211 and i can only let you know last years taxes. Taxes do change. Taxes also change upon the sale of a property as well.
Harold Sharpe - Broker
So Cal Homes
California Department of Real Estate Broker License # 01312992
If you are purchasing in this market with values at 50% the value of homes purchased 3-5 years ago your home would be re assesd to current market values