如果你的房子降了很多。。。

你可以去county要求一个新的估价：

填一个表格（Application for Changed Assessment, form #BOE-305-AH (S1) Rev. 6 (2-06)）
It is a single page application that asks you to provide the filed values on the tax roll and asks you for your opinion of current value for land and structures. This form's purpose is to file for an assessment appeal. 填好寄给county后，你会收到一个post card 上面会给你一个application number.

The County Tax Assessor's office has been inundated with appeal applications.

但是要注意的是，一旦你要求county来重新估价你的房子，（re-assess）， 你就自动的从一个Prop 13的保护下出来了。 这个Prop 13的意思是fixes your property taxes (with minimal increases) to the value of our home at the time of purchase. 这样一来，以后每2年county都会来重新估价。 That's fine as long as the value of our homes continues to decline; 但是如果房子上涨的话那可能就不那么合算了。你可能反而会多交税了。 但是从现在的房市看，可能还是重新估价一下比较好。

自己再多做做研究。 看看怎么会合适你。

http://arcc.co.san-diego.ca.us/docs/calrev.pdf