Legal basis: Article 3 of the Measures for the Administration of Urban Real Estate Mortgage The term "real estate mortgage" as mentioned in these Measures refers to the act that the mortgagor provides the mortgagee with debt performance guarantee with his legal real estate without transferring possession. When the debtor fails to perform the debt, the creditor has the right to be paid in priority with the proceeds from the auction of mortgaged real estate according to law. The term "mortgagor" as mentioned in these Measures refers to a citizen, legal person or other organization that provides legally acquired real estate to the mortgagee as a debt guarantee for himself or a third party. The term "mortgagee" as mentioned in these Measures refers to the citizens, legal persons or other organizations that accept real estate mortgage as the debtor's debt guarantee. The term "pre-purchased commercial housing loan mortgage" as mentioned in these Measures refers to the behavior that after the purchaser pays the down payment, the loan bank pays the remaining house payment and mortgages the purchased commercial housing to the loan bank as a loan repayment guarantee. The term "mortgage of construction in progress" as mentioned in these Measures refers to the act that the mortgagor, in order to obtain the construction loan of construction in progress, mortgages the legally obtained land use right together with the investment assets of construction in progress to the loan bank as a loan repayment guarantee without transferring possession.