At 07:24hrs Truck 23 and Battalion 21 where dispatched to the construction site at 12450 S. Kirkwood. Upon arrival a male subject was found lying on the sidewalk after having fallen from a 3rd floor window of the hotel under construction. Immediately providing patient care, personnel requested Memorial Herman Life Flight to the scene bringing Engine 22 to assist with the LZ. Upon arrival of FBCEMS Medic #607 personnel continued to provide patient care until arrival of the aircraft. Following transfer of the patient, and the safe departure of the aircraft, all units returned to service.