Loan for the property

Hello All, I'm planning to purchase a property worth 60 lac, I will be applying a loan for this. But the issue here is the present owner is having the original document in bank as he is having a loan on the property. Once the loan amount is cleared, then only he can get the original document back. But the problem is my bank will not allow me to apply for a loan if the documents of the property is already in debt. In this case what I have to do, do I need to make any agreement with seller for something?? Regards, Thomas