Well, I would double check with the county assessor's office to be certain, but as long as you didn't sign and record a grant deed when you did the refi, then your assessed value should be $1. By foreclosing on a second trust deed it would make you the owner. However, if the first went through a trustee sale, then you might have been left with nothing. I would double and triple check the paperwork from the refi for a grant deed, and if you do find one, it will have the "sale" price in it, and that would be your new assessed value for the property taxes. If you can't find it, and if this property is in OC, I can easily check for a grant deed. Depending on the location, I can also check other counties too. Just PM me, or let Trooper know, and I can help you out on that.
You also might want to check out <a href="http://www.foreclosureforum.com/mb/index.html">foreclosure forum</a> to see if the question has been asked there. If not, they might have a more confident answer for you if you post the question there. I have posted there before, and every time I have received a quick response.