Abstract: A staircase area at which a staircase is installed across a first floor and a second floor is provided in a building. A part of the staircase area is a non-installation space in which a staircase is not installed, and a lifting space through which a transport robot moves up and down between the first floor and the second floor is provided using the non-installation space. The lifting space and a staircase hall having a spandrel wall there between are adjacent to each other the second floor. An opening through which the transport robot moves between the lifting space and the staircase hall is provided in the spandrel wall.