A new, environmentally friendly airport traffic control tower has opened at San Francisco International Airport (SFO) designed by Fentress Architects of Denver. With an iconic, sculptural profile, the new tower is 221 ft tall. The 650 sq ft controller work area gives air traffic controllers unobstructed 235-degree views of SFO's runways and taxiways. Its twisting facade is informed by the colour, massing and materials of the existing terminal.