You would have to Hire a Realtor or an Attorney. Just paying off the amount, is what a short Sale is all about. Your Mortgage co. usually pay your Attorney Fees, Title and Deed Cost your taxes, Realtor commissions, transfer stamps, city of Chicago stamps, Property certification, and other cost. Again, start with a C.M.A. or an appraisal to determine the Market value, that will tell you the direction you should go in. Remember, usually there is a relocation fee to help you get moved.