Over fifty years after completion, the John Hancock Center, designed by American architecture firm Skidmore Owings & Merrill, has established itself as one of the world’s most recognized skyscrapers and an iconic example of late 20th century Chicago design, construction, and engineering. The building’s structural, programmatic, and architectural innovations combine to create a design that has become a symbol of the city.
John Hancock Center Technical Information
- Architects1: Skidmore Owings & Merrill
- Location: 875 North Michigan Avenue, Chicago, Illinois, USA
- Owner/Developer: Jerry Wolman Associates
- Topics: Mixed Use, Skyscrapers, Steel Structure
- Site Area: 104,000 ft2
- Project Area: 2,800,000 ft2
- Height: 344 m (1,128 ft), Height to tip: 457 m (1,499 ft)
- Stories: 100
- Project Year: 1970
- Photographs: © Dave Burk, Flickr Users: © Kim Eriksson, © Ben Schumin, © Scutter Hohn
The John Hancock Center is gutsy, masculine, and industrial; reflecting the tradition of Chicago, where structure is of the essence.
– Bruce Graham, Skidmore, Owings and Merrill
John Hancock Center Photographs
Text by the Architects
875 North Michigan Avenue, formerly known as John Hancock Center, the world’s first mixed-use tower, is an architectural icon representing the close collaboration between architect Bruce Graham and structural engineer Fazlur Khan. The building remains an archetype for the collaborative ideal that continues to make SOM a leader in a wide spectrum of design disciplines.
Known locally as “Big John,” the tower is situated on North Michigan Avenue in a prestigious district with expensive apartments, shops, offices, hotels, restaurants, and art galleries. The wish to continue this mixture initially gave rise to the idea of building a 70-story apartment tower and a 45-story office tower. But the two towers would have occupied most of the site and would have impaired each other’s privacy and daylight conditions. Moreover, the lower-level apartments would have suffered from noise nuisance from the street. Therefore, it was decided to construct a single tower where the offices would be on the lower floors and the apartments on the higher levels.
The tower’s tapered shape was chosen to match the different floor space requirements that decrease from bottom to top — from the entrance and commercial zones at the base to the clusters of small apartments at medium height and finally to the large apartments on top, where relatively less space is needed for ancillary rooms with artificial lighting.
Structurally, the steel frame’s exterior members represent a tube where the necessary stiffness is provided by diagonal members and those structural floors that coincide with the diagonals’ intersections and the corner columns. In keeping with the functional organization, this tubular body has its largest cross-section where the stresses caused by wind forces are greatest. Steel consumption, amounting to about 30-pounds-per-square-foot of floor space, was no greater than for a 50-story conventional tower.
John Hancock Center Plans
John Hancock Center Image Gallery
Skidmore, Owings & Merrill (SOM) is a global architectural, urban planning, and engineering firm. It was founded in Chicago in 1936 by Louis Skidmore and Nathaniel Owings. In 1939, they were joined by engineer John O. Merrill. The firm opened its second office, in New York City, in 1937 and has since expanded all over the world.
Works from SOM
- Structural Engineer: Skidmore Owings & Merrill
- Contractor: Tishman Construction