Willis Tower Wikipedia. SearsWillis Tower. The Willis Tower, then known as the Sears Tower, in 1. Location within Chicago. Former names. Sears Tower 1. Record height. Tallest in the world from 1. IPreceded by. World Trade Center 1. Surpassed by. Petronas Twin Towers. General information. Status. Complete. Type. Office, observation, communication. Architectural style. R0isH8D5Lcs/hqdefault.jpg' alt='Watch The Night Flier Hindi Full Movie' title='Watch The Night Flier Hindi Full Movie' />International. Location. S. Wacker Drive. Chicago, Illinois 6. United States. Coordinates. N8. 73. 80. 9W 4. N 8. 7. 6. 35. 8W 4. Coordinates 4. 15. N8. 73. 80. 9W 4. N 8. 7. 6. 35. 8W 4. Current tenants. United Airlines. Named for. Willis Group. Sears 1. 97. 3 2. Construction started. Completed. 19. 73 4. Owner. Blackstone Group1Height. Architectural. 44. Tip. 52. 7 m 1,7. Top floor. 41. 2. Technical details. Floor count. 10. 83 3 basement floors, 1. Floor area. 41. 6,0. Liftselevators. 10. Westinghouse, modernized by Schindler Group. Design and construction. Architect. Skidmore, Owings and Merrill2Fazlur Rahman Khan. Bruce Graham. Main contractor. Morse Diesel International. References. I. Willis Tower at Emporis2The Willis Tower, built as and still commonly referred to as the Sears Tower, is a 1. Chicago, Illinois, United States. At completion in 1. World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 2. Western Hemisphere until 2. World Trade Center site. The building is considered a seminal achievement for its architect Fazlur Rahman Khan. Watch Nintendo Quest Online Iflix here. The Willis Tower is the second tallest building in the United States and the 1. More than one million people visit its observation deck each year, making it one of Chicagos most popular tourist destinations. The structure was renamed in 2. Willis Group as part of its lease on a portion of the towers space. As of December 2. United Airlines, which moved its corporate headquarters from the United Building at 7. West Wacker Drive in 2. The buildings official address is 2. South Wacker Drive, Chicago, Illinois 6. History. Planning and construction. In 1. 96. 9, Sears, Roebuck Co. Sears executives decided to consolidate the thousands of employees in offices distributed throughout the Chicago area into one building on the western edge of Chicagos Loop. Sears asked its outside counsel, Arnstein, Gluck, Weitzenfeld Minow now known as Arnstein Lehr, LLP to suggest a location. The firm consulted with local and federal authorities and the applicable law, then offered Sears two options an area known as Goose Island and a two block area bounded by Franklin Street on the east, Jackson Boulevard on the south, Wacker Drive on the west and Adams Street on the north, with Quincy Street running through the middle from east to west. This latter site was decided upon, and preliminary inquiries determined that the necessary permits could be obtained and Quincy Street vacated. The next step was to acquire the property a team of attorneys from the Arnstein law firm, headed by Andrew Adsit, began buying the property parcel by parcel. Sears purchased 1. City of Chicago for the portion of Quincy Street that divided the property. Sears, which needed 3,0. Skidmore, Owings Merrill SOM to produce a structure to be one of the largest office buildings in the world. Their team of architect Bruce Graham and structural engineer Fazlur Rahman Khan designed the building as nine square tubes each essentially a separate building, clustered in a 33 matrix forming a square base with 2. All nine tubes would rise up to the 5. At the 5. 0th floor, the northwest and southeast tubes end, and the remaining seven continue up. At the 6. 6th floor, the northeast and the southwest tubes end. At the 9. 0th floor, the north, east, and south tubes end. Im sorry, theres no heartbeat, my doctor said to me. She didnt sound very sorry, leaving the room so quicklyostensibly so I could pull up my. Gmail is email thats intuitive, efficient, and useful. GB of storage, less spam, and mobile access. The remaining west and center tubes continue up to the 1. The Sears Tower during its construction, in 1. The Willis Tower was the first building to use Khans bundled tube structure. This innovative design was structurally efficient and economic at 1,4. Empire State Building, yet cost much less per unit area. This structural system would prove highly influential in skyscraper construction. It has been used in most supertall buildings since then, including the worlds tallest building, the Burj Khalifa. To honor Khans contributions, the Structural Engineers Association of Illinois commissioned a sculpture of him1. Willis Tower. Sears executives decided that the space they would immediately occupy should be efficiently designed to house their Merchandise Group, and that floor space for future growth would be rented out to smaller firms and businesses until Sears could retake it. The latter floor areas had to be designed to a smaller plate, with a high window space to floor space ratio, to be attractive and marketable to prospective lessees. Smaller floorplates required a taller structure to yield sufficient square footage. Skidmore architects proposed a tower with large 5. Sears Tower its distinctive look. Watch The Night Flier Hindi Full Movie' title='Watch The Night Flier Hindi Full Movie' />As Sears continued to offer optimistic projections for growth, the towers proposed floor count rapidly increased into the low hundreds, surpassing the height of New Yorks unfinished World Trade Center to become the worlds tallest building. The height was restricted by a limit imposed by the Federal Aviation Administration FAA to protect air traffic. The financing of the tower was provided by the Sears company. It was topped with two antennas to permit local television and radio broadcasts. Sears and the City of Chicago approved the design, and the first steel was put in place in April 1. The structure was completed in May 1. The construction cost about US1. By comparison, Taipei 1. Taiwan, cost around the equivalent of US2. Black bands appear on the tower around the 2. These are louvres that allow ventilation for service equipment and obscure the structures belt trusses. Even though regulations did not require a fire sprinkler system, the building was equipped with one from the beginning. There are around 4. In February 1. 98. The western antenna was later extended, bringing the overall height to 1,7. June 5, 2. 00. 0 to improve reception of local NBC station WMAQ TV. Suits filed to halt construction. As the construction of the building neared the 5. The suits alleged that above that point television reception would deteriorate and cause property values to plummet. The first suit was filed by the States Attorney in neighboring Lake County on March 1. A second suit was filed on March 2.