Bank preapproved us at 250k for a home loan. We signed to buy a house for 171500. House property tax appraisal 2008 was 169800. Seller refinanced last year with appraisal of 178000. Original appraisal came back at 171000. Seller agreed to sell at this. Underwriting at bank disagrees with comps, has reviewed. Review comes back at 159000. Unless we pay 12k, which we cannot, will not loan. We are looking at other banks. But we must be out of our duplex end of month as rented out. What recourse might I have with the bank due to their inabilities?