There is no property company or developer in the house. Who should be responsible for the maintenance? Does the building miss all the expenses?

How can there be no property management company? How many years have you bought a house? Look at the house sales contract. There will be instructions about waterproofing. Moreover, one of the conditions for developers to obtain a housing sales license is that they have signed a preliminary property service contract with the property company. Therefore, it is impossible for commercial housing to have no property company. It is necessary to distinguish the cause of water leakage. If it is the responsibility of the neighbors upstairs, it is necessary to discuss it with the upstairs. )