Basically, you call up the new place, say hey I've got a shitty loan, can you beat it? They say yes or no. If it's yes, they basically pay off the old loan, and you pay them now, hopefully with a better interest rate. Might cost a fee, but if you can't sell it right now, then this will at least save you money in interest and lower your monthly payment. You could still pay it down enough to sell it, but it's up to you. Doesn't hurt to call.