At present, it should be called special maintenance funds. This fund is used for the maintenance, updating and transformation of common parts of the property, public facilities and equipment after the property warranty expires. Once paid, it cannot be returned to the owner. After the property rights are transferred, the new owner will also have to pay special maintenance funds on a monthly basis. However, since the implementation details of the national "Property Management Regulations" have not been released, various places may have different practices, but they are certainly irreversible.