Mdewaikar, The precise tax rates is difficult to pine point because it can vary depending on the specific location, community, how new the development is as well as any other assessments. To get specific/precise tax details for a home in Contra Costa County and Alameda county, you can go to their tax assessors website:
For Contra Costa county, you can go to: http://www.cctax.us
For Alameda County, you can go to: https://www.acgov.org/propertytax/index.htm
Go to Account lookup or Lookup Taxes. You will find the actual tax bill which breaks down what is being charged and for what reason.
Good luck, Al Pacheco
Real Estate Broker/Property Manager