@David Piqueira say you own a note with Unpaid Balance (UPB) of $50,000 on a house worth $90,000. The final step in the foreclosure process is the house HAS TO BE PUT UP FOR AUCTION. The only reason that wouldn't happen is if the borrower gives you a Deed in Lieu of foreclosure - essentially signs the house over to you. You set the minimum bid at the auction and it consists of your UPB + Legal expenses to foreclose + sheriff's fees/costs to auction + any other money you advanced on borrower's behalf like taxes and insurance. These expenses become part of your UPB. So maybe all that totals $65,000. The minimum bid is $65,000 but the house is still worth $90,000 so it could very well sell for $65K or $70K or 80K. IF it sells for $80K, you get your $65 and the borrower gets $15 minus any costs he's responsible for.
@Clint Galliano, you might want the house, but can you see how it's only fair to the borrower that he gets anything above what's owed to you? That's equity that belongs to him. If you really want to end up with a property, only buy notes where the UPB is close to or more than the value of the house.