7 South Dearborn in Chicago, Illinois by SOM
The following text and images are by Skidmore Owings & Merrill (SOM) for their proposed tower at 7 South Dearborn in Chicago, Illinois.
Slated for completion in 2004, 7 South
Dearborn will be a 108-story, 1,550-foot tower, which will
be the world's tallest building. When topped by two digital
broadcast antennas, 7 South Dearborn will achieve a total
height of 2,000 feet. The mixed-use complex will include
commercial office, residential, retail and parking.
The 1.9 million sf building will include 360 residential units on 40
floors, 765,000 sf of office space on 32 floors and 800 parking spaces.
In addition, 90,600 sf on the top 13 floors will be dedicated to
communications facilities. The 75,000 sf of retail will include
restaurants, shops and amenities such as food delivery service, a
private fitness club, laundry/cleaner and drugstore. The tower will
continue the successful transformation of Chicago's Central Business
District into a community enlivened by a full range of residential,
retail and commercial activity 24 hours a day, seven days a week.
The stainless steel and aluminum exterior facade will be accented by
light green, lightly-tinted low e coated double glazing. Six distinct
groups of floors will be visible. The lower two groupings will be
separated by standard setbacks, while the upper four groupings will be
divided by distinctive notches that underscore the building's role as a
transmission tower and reveal the cantilevered character of its
7 South Dearborn represents a major advancement in the engineering of
tall buildings. Although taller than the Sears Tower, the building's
floor plates are substantially smaller. This is a result of its stayed
mast structural system, formed from a series of spaces that evolve from a
reinforced concrete core. A limited number of widely spaced columns dot
the perimeter of the office component, and the interior is column-free.
The cantilevering of the upper 57 residential floors from a concrete
core makes columns unnecessary on the exterior walls and provides
11-foot uninterrupted views in all directions.
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