Willis tower how many floors

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 Tower is fronted by a separate tourist entrance, the Skydeck Pavilion added in by Skidmore Owings and Merrill.

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In the building was renamed Willis Tower after the Willis Group Holdings, the global insurance broker who calls the Tower its Midwest home. In July , U. Equities Realty led the design and construction of a multi-million-dollar renovation of Skydeck Chicago. With the renovation of Skydeck came The Ledge, a series of windows that extend from the building offering views straight down over the city of Chicago.

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. It comprises a total of 57 elevators and 8 escalators. At a particular stage in the architectural and engineering process, the original Emaar programmers experienced financial problems, and required more money and financial funding. Sheikh Khalifa, the ruler of the United Arab Emirates, granted monetary aid and financing, hence resulting in the changing of the name to'Burj Khalifa'.

The concept of profitability derived from creating high density developments and malls around the landmark have proven effective. Its surrounding malls, hotels and condos in Downtown Dubai have generated the most revenue from the project as a whole, while the Burj Khalifa itself made little or no profit.

Critical reception to Burj Khalifa has been generally positive, and the building has received many awards. However, there were numerous complaints regarding migrant workers from South Asia who were the key building labor force.

These centered on low wages and the practice of confiscating passports until duties were complete. Several suicides were reported. Are you sure to delete your account? Delete account.