The first designs were for a boxy structure exclusively for Sears, but the architects and real estate advisors pressed for a taller tower with upper floors for tenants. The building slowly stretched to 4. As designed by architect Bruce Graham and engineer Fazlur Khan of the Chicago office of Skidmore Owings and Merrill SOM , the structure was a "bundled tube" system of nine squares with sides of 75 feet for an overall x ft , sheathed in a curtain wall of dark tinted glass.
Above the fiftieth floor, some squares dropped away as the tower rose to create smaller floor plates and a distinctive stepped silhouette. The ledge is 1, feet and stories up. Skydeck is the highest observation deck in the United States. The Ledge is made of three layers of half-inch thick glass laminated into one seamless unit. The Ledge is built to withstand four tons of pressure and can hold 10, lbs. The boxes retract into the building for easy cleaning and maintenance.
On a clear day, views can span 50 miles and four states: Illinois, Indiana, Wisconsin and Michigan. The tower is home to more than businesses including law, insurance, transportation, financial companies and more. Willis Tower contains approximately 4. Willis Tower has a rentable area of 3. The redevelopment consists of more than , square feet of new retail, dining and entertainment space at the base of the tower, , square feet of new tenant amenity spaces, and a 30, square-foot outdoor deck and garden.
Gensler is the architectural partner of record for the Willis Tower redevelopment. From street to sky the building will provide inviting hospitality and memorable experiences on a scale unmatched by any other destination. The mission of the redevelopment is to create an all-season, urban destination that brings the surrounding community together and creates a true neighborhood that is the heart of downtown Chicago.
The new Willis Tower will dissolve the borders between work and life and fostering a collaborative, inviting atmosphere.
The hanging sculpture is nearly feet tall and feet wide creating a cloud built from nearly 7,, nine-inch individual kite-like disks. It will feature expansive lounges, a bar and patio. Structure in General Building type. Building status. Structural system. Structural material.
Foundation system. Facade material. Facade system. Facade color. Architectural style. Roof system. Usages Main Usage. Side Usage. Until Taipei was topped out in , the Sears Tower held title to the world's highest roof and highest occupied floor. This has been the tallest building in Chicago since For a timeline of Chicago's tallest building through history, start with Holy Name Cathedral. The structure is formed from nine bundled square tubes, each 75 feet wide with no columns between the core and perimeter.
Two of the tubes are 50 floors high, two are 66 floors, three are 90, and two are The design was actually inspired by a pack of cigarettes. Architect Bruce Graham used a pack of cigarettes to visualize his idea of using a series of bundled cylinders at different heights to create the tower.
Sears executives chose to build a single tall headquarters building over an alternative proposal for twin towers at half the existing tower's height. The two antennae on the roof give the tower one of the highest "tip heights" of any skyscraper in the world.
In , four high-definition television antennas were lifted to the roof by helicopter. In the company moved to a low-rise complex in the northwest Chicago suburb of Hoffman Estates. The lobby floor is decorated with metal tiles in a stylized design based on the bundled tube structure. The height was listed in many sources for years as 1, feet.
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