Who should deal with the damage of stairs in residential buildings?

Public facilities construction is a part of the price cost of commercial housing. The public parts of residential areas mainly include foundations, load-bearing walls, columns, beams, floors, roofs, outdoor walls, hallways, staircases, corridors and so on.

Public facilities and equipment mainly include elevators, antennas, lighting, fire-fighting facilities, green spaces, roads and so on. During the warranty period, the development and construction unit shall be responsible for maintenance.