Can a seller sell a house with owner financing with an existing mortgage let's say the house is worth $150,000 and they owe $80,000 on the mortgage however they will not sell it to you for less than $70,000 i.e their equity in the property. So the seller is willing to accept an owner financed offer on that $70,000 now how would you deal with existing mortgage of $80,000 because with the seller transferring the title and deed over to you wouldn't that trigger the due on sale clause?