This paper describes the design and development of a new robotic system in which the autonomous floor cleaning robot cooperates with the elevator to clean multiple floors in the high-rise office building without human intervention. The autonomous floor cleaning robot, which was reported in our previous paper, was modified and equipped with an optical transmitter to communicate with the elevator. The elevator accepts requests from the robot, opens the door and moves to the designated floor carrying the robot. The robot cleans specified area of the floor automatically and calls the elevator to move to the next floor when finished the cleaning task. We successfully introduced this system to a site of three office buildings. With only one human operator and seven robots, approximately 153, 600 [m2] in 80 floors can be cleaned in about 5 [h] and 30 [min] .
