The diagrid forming the outer shell of the new 42 storey Hearst Corporation building in uptown Manhattan is rising quickly out of the ground while glazing work is already under way on the lower storeys. Structural engineers Cantor Seinuk worked with UK architect Foster Associates to develop the highly redundant triangulated steel outer structure which is repeated every four storeys. The steel diagrid acts with the concrete core located at the rear of the building to maximise stiffness while using 20% less steel than a conventional frame.
The tower rises from the preserved faþade of the original listed Hearst building which was built in 1928. Its lower levels are supported on inclined steel mega columns.