What document verifies the amount of unpaid balance during a mortgage assignment?

The estoppel certification serves as a crucial document in verifying the amount of the unpaid balance during a mortgage assignment. It is a written statement provided by a borrower, typically to a lender, that confirms the current status of the mortgage loan, including the remaining balance owed. This certification helps ensure all parties have a clear understanding of the financial obligations associated with the property and facilitates a smoother transfer of mortgage interest if the loan is being assigned.

The other options do not serve this specific purpose. A mortgage satisfaction letter indicates that a mortgage has been paid off and is typically issued once the loan is fully repaid. An affidavit of title is used to declare the ownership of a property and the status of its title but does not detail the unpaid mortgage balance. A lease agreement pertains to rental arrangements and does not relate to mortgage balances or assignments. Thus, the estoppel certification is the most relevant document for confirming the unpaid balance associated with a mortgage assignment.