@Jon Holdman @Jay Hinrichs @Jeff S.
Thank you all for the advice and they really helped me get a better grip of this deal. I am trying to work with the borrower through a deed-in-lieu to another flipper but the numbers don't look great, so even if it works I may have to take a hair cut. The borrower is also trying to get a refi but not sure if he will be qualified since he's late on payment for the previous loan. This guy has a good track record and has flipped 45 homes in the last two years, so I doubt he's willing to give up everything over a couple of unsuccessful deals.
On the other hand, my friend recommended me some debt collection company. Does any of you have experience with such service? They claim they don't charge anything unless debt is collected and their fee is quite reasonable at 15%. If they fail, they have an in-house law firm which will handle the case at the same rate. If that still isn't successful, they will hand over to litigation/lawsuits who charges about 30% only if debt is collected. They claim they have a 85% success rate which is quite impressive. Is there any drawback if I hand this over to a debt collector now?