Thanks to this upgrade, directed by its new owner, EQ Office and executed by the design firm Gensler, its services improved substantially.Īmong other measures, a new automation system was installed in the building together with high-efficiency lighting systems with improved controls and plumbing and heating systems and air conditioning, which increased the energy efficiency and reduced its environmental footprint. In 2021, the Willis Tower underwent its largest restoration and transformation in its 43-year history, which included new stores and restaurants on the podium. They are grouped together like a closed square until the first 50 floors and then they end at different heights to create the tower's characteristic shape incorporating various floor plans. The basic structure, the first of its kind to use a bundled-tube construction method, consists of nine square tubes measuring 23 meters by 23 meters without columns at their base, forming a framework of cellular tubes.Įach of these nine tubes is rigid and does not need internal supports, with it resting on reinforced concrete caissons. Its projects can be found mainly in Chicago, Dubai and China.įor the Willis Tower, the iconic setback design of the structure was the result of the client's spatial needs, requiring a building to incorporate not only large areas for its own operations, but also a variety of smaller floors for the tenants that did not require so much space. firm established over eighty years ago is living history of skyscrapers. Skidmore, Owings & Merrill (SOM), the kings of the skyscrapers
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