Back to the original post-
The amount that the tax records show as value is how the taxing district uses to tax.
The fair market value (FMV) is what houses are selling at and it is the buyers that determine what that value is.
When lenders hire appraisers to assess value they have a very complex matrix of determining value and the value on the tax records has nothing to do with it.
This is what you want to know:
Find 3 house with 1.5 miles of the house you want that are 1.within 200 sq. feet in size 2. within 2 years of age and has the same number of bedrooms and baths and in similar condition. Find 3 active houses like it and 3 pending houses like it and 3 sold houses (within 6 months) like it. Those would be the comps to your house in broad terms. The CMA will show what the average price per sq foot.
Your realtor will do this for you. That will give you an idea of the FMV.
I hope this makes sense.