What's the responsibility for the elevator often breaking down the property?

There are three situations: first, the elevator is inferior or eliminated and does not meet the national standards, and the development company should bear the responsibility; Second, the property management is not good, and the use of the passenger elevator as a cargo elevator causes damage, and the property is responsible; Three, in the use of normal failure, the maintenance unit is responsible for the warranty period, extended by the owner to enable the public * * * maintenance fund is responsible for maintenance.