The AT&T corporate headquarters in New York City (now the Sony Building) was a striking departure from the "glass box" design of many high-rise office buildings at the time of its design and construction. Via use of an innovative structural steel framing system, a host of challenging architectural and engineering requirements were met for the 36 story project in midtown Manhattan. Architect Philip Johnson has called the AT&T building his "capolavoro - the culmination of my life's work."