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Home Valuation in a Dodgy neighborhood
I wouldn't personally spend any money on an appraisal.  Spend some time yourself looking at Zillow.com and maybe Realtor.com and other sites to review recent sales in your specific area.  Not the houses a mile away.  Try to find comparables to yours.  The key factor is dollars per square foot.  See if the trend over the last couple of years is upwards or downwards in dollars per square foot of living area.  If it's downwards, I wouldn't invest for sure.