California has a state law that decides property tax for properties within the state. When buying real estate the property tax is re-assessed at the time the property Title records. The new tax will be 1% of the purchase price as the base line tax. Add to this any additional local bond issues, assessments in place and any other misc. type expenditures. When I consult with my Buyer clients I use 0.25% as a good rule of thumb for estimating the new property tax to cover for these extra items. In total then use 1.25% as your guide.
When deciding what area to live in I recommend focusing on most other items other than property tax to influence your choices.
Feel free to contact me if you are not presently working with an agent/broker to help you with your search.