1. To change the buyer and the room number, you need to go through the contract cancellation registration and filing, and to change other contents of the contract, you need to go through the contract change registration and filing.
2. Where it is necessary to handle the cancellation and change registration of the commercial housing sales contract, an application form shall be filled in, and the reasons for cancellation and change of the application form shall be filled in by the buyer, and both parties must sign and seal it.