Legal analysis: You can negotiate with the buyers to pay back the mortgage with the down payment of the buyers, or give a little advance fee to let the third-party financial company help pay back the mortgage.

Legal basis: Article 2 17 of the Civil Code of People's Republic of China (PRC) stipulates that the obligee enjoys the real right of immovable property. The items recorded in the certificate of real estate ownership shall be consistent with the real estate register; If the records are inconsistent, unless there is evidence to prove that the real estate register is indeed wrong, the real estate register shall prevail.