The county probably asseses the property at the time of completion. You bought it for less so if you go to the county assessor for Santa Clara County they should be able to help you. Their website is : http://www.sccassessor.org/portal/site/asr/
Congratualations on getting such a good deal.
The assessment was for 2008-2009 when the builder had a house but was being assessed as if it was an empty lot. My basis will be based on my purchase price.
For 2009-2010 prop taxes,
I paid based on an empty lot at the regular time.
After a year and some months, I'll get a supplemental bill based on the builder's assessment.
Some number of months after that I'll get a supplemental refund to account for my purchase price being less than the estimate based on the builder's assessment.
I was assured my 2010-2011 assessment will be purchase price + whatever prop 13 allows.
Seems backwards and a bit inefficient, but about right for gov't work.
Apparently I first pay 2009-2010 prop taxes at the regular time based on the incorrect value (just the land).
Then I pay based on the
Your question is confusing. If you think that the assessment is for the property with the new construction then and only then should you appeal.
Be prepared to show them comaparables that support the old assessment. If you cannot support the value then do not go through the process. The appeal process is fair and effective.