We also have special assessments here, which can make a huge impact on the total tax bill. That does not go by assessed value. The general rule of thumb for special assessments is "the older the home, the lower the special assessments". Special assessments can vary pretty drastically, something to keep an eye on if you are considering purchasing a home.
Please let me know if I can help any further. Have a great day!!
Property tax is calculated on the assessed value of the property, not on it's age. So, if the value goes up, the property taxes will go up and if the value goes down, the property taxes will go down.
Shanna has covered this succinctly; nothing to add here with the exception of the post below:
"Estimating Property Taxes in CA"