You may have a seriously flawed appraisal in my humble opinion, if this is a standing building with a roof, etc. I would most likely not accept an appraisal like that as the appraiser failed to do their job. No building depreciates to $0, as there is always a salvage value to consider unless the removal of the building would cost more. A more thorough analysis of the actual building that you are talking about would be necessary. It is hard to just make a general statement without all of the facts.
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