Should I Do a Short Sale?

Hi,

I have a distressed homeowner that is willing to work with me. His house has a retail value of about $250,000.00 & he owes $200,000.00. Dwan says that the rehabber will buy the property at 65% of the retail value which comes out to $162,500.00. The mortgage balance is $37,500.00 more than the 65% of what the rehabber would be willing to pay. How should I handle this? Should I do a short sale? Thank you. ???
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I would ask the seller if he/she is willing to carry the balance at a reasonable interest rate. Going short sale would be great but the bank has to approve it and the process may take longer.