Generally, a staircase has several units and three households.

Three households and one staircase are generally one unit. There are three households in one staircase, that is, there are three households on this floor, and * * * uses the equipped elevator. For a unit with two elevators and one staircase, it is regarded as two elevators and three households. For buildings with elevators, the number of elevators and the number of households are determined according to the number of elevators rather than the number of stairs. Because there is an elevator in the building, the stairs are generally designed in the style of safe passage and are hidden.