Legal analysis: because the Housing Authority and the bank are cooperative, they register with the Housing Authority to handle all kinds of house sales, so the mortgage is handled in the Housing Authority and the money is taken from the bank. When mortgaging movable and immovable property, it is necessary to apply to the local government registration authority for mortgage, register the property mortgage, and obtain approval before mortgage loan can be made.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 400 To establish a mortgage, the parties shall conclude a mortgage contract in writing. A mortgage contract generally includes the following clauses: (1) the type and amount of secured creditor's rights; (2) The time limit for the debtor to perform the debt; (3) The name and quantity of the mortgaged property; (4) the scope of the guarantee.

Article 402 Where the property specified in Items 1 to 3 of the first paragraph of Article 395 of this Law or the building under construction specified in Item 5 is mortgaged, the mortgage registration shall be handled. The mortgage is established at the time of registration.