The 59-story, nearly 1.6 million gross square foot, Citicorp Center tower completed during 1977 in mid-town Manhattan was designed by the much-celebrated architect Hugh Stubbins of Cambridge, Massachusetts. The tower incorporated an array of notable technological features including doubledecker elevator cabs to reduce the number of elevator shafts and thereby increase the usable floor area, alternative energy source and reclamation systems, and low-brightness lighting that helped render the tower some 42% more energy efficient than comparable structures designed to conventional standards (http://www.loringengineers).