What is the standard of shared housing area?

Housing pool area refers to the abbreviation of shared public construction area, which together with the interior construction area constitutes the construction area of commercial housing. The shared public building area is: 1, lobby, hall, corridor, corridor, elevator (building) hall, stairwell, elevator shaft, elevator machine room, garbage chute, pipeline shaft, water pump room, fire escape, power supply and distribution room, guard room on duty, etc. And the public services of the whole building. 2. The partition walls and external walls (including gables) between each set and the public building space are half of the horizontal projection area of the wall area.