词条 | Willis Tower | ||||||||||||||
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|name = Willis Tower |former_names = Sears Tower (1973–2009) |status = completed |image = Sears Tower ss.jpg |caption = Seen in 1998 (as Sears Tower) |location = 233 S. Wacker Drive Chicago, Illinois 60606 United States |coordinates = {{coord|41.8789|-87.6358|region:US-IL|format=dms|display=inline,title}} |start_date = {{Start date and age|1970}} |completion_date = {{Start date and age|1973}} |architect = Skidmore, Owings and Merrill[1] Fazlur Rahman Khan Bruce Graham |owner = Blackstone Group[1] |floor_area = {{convert|416000|m2|sqft|-2|abbr=on}}[1] |top_floor = {{convert|412.7|m|ft|0|abbr=on}}[1] |floor_count = 110 (+3 basement floors)[5] |references = I. {{note|talleststatus}}{{Emporis |id=117064 |name=Willis Tower}} [1] |highest_prev = World Trade Center (1970) |highest_start = 1973 |highest_end = 1998 |highest_next = Petronas Twin Towers |map_type = Chicago#Illinois#USA |map_dot_label = Willis Tower |map_caption = Location in Chicago##Location in Illinois##Location in the United States |building_type = Office, observation, communication |architectural_style = International |current_tenants = United Airlines |architectural = {{convert|442.1|m|ft|0|abbr=on}}[2] |tip = {{convert|527|m|ft|0|abbr=on}}[2] |elevator_count = 104,[2] with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group |main_contractor = Morse Diesel International |namesake = Willis Group Sears (1973–2009) }} The Willis Tower, built as and still commonly referred to as the Sears Tower, is a 110-story,[3] {{convert|442.1|m|ft|order=flip|adj=on}} skyscraper in Chicago, Illinois.[4] At completion in 1973, it surpassed the World Trade Center in New York to become the tallest building in the world, a title it held for nearly 25 years; it remained the tallest building in the Western Hemisphere until the completion of a new building at the rebuilt World Trade Center site in 2014. The building is considered a seminal achievement for architect Fazlur Rahman Khan.[5] The Willis Tower is currently the second-tallest building in the United States and the Western hemisphere – and the 16th-tallest in the world. More than one million people visit its observation deck each year, making it one of Chicago's most popular tourist destinations. The structure was renamed in 2009 by the Willis Group as a term of its lease. {{As of|2018|04}}, the building's largest tenant is United Airlines, which moved its corporate headquarters from the United Building at 77 West Wacker Drive in 2012, occupying around 20 floors.[6][7][8] Other major tenants include the building's namesake Willis Group and law firms Schiff Hardin and Seyfarth Shaw.[8] Morgan Stanley plans to move to the building in 2019 and become its fourth-largest tenant by 2020.[8]HistoryPlanning and construction{{stack|}}In 1969, Sears, Roebuck & Co. was the largest retailer in the world, with about 350,000 employees.[9] Sears executives decided to consolidate the thousands of employees in offices distributed throughout the Chicago area into one building on the western edge of Chicago's 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: the Goose Island area northwest of downtown, 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. After selection of the latter site, permits to vacate Quincy Street were obtained.[10] Attorneys from the Arnstein firm, headed by Andrew Adsit, began buying the properties parcel by parcel.[11] Sears purchased 15 old buildings from 100 owners and paid $2.7 million to the City of Chicago for the portion of Quincy Street the project absorbed.[12] Sears, which needed {{convert|3000000|sqft|m2}} of office space for its planned consolidation and predicted growth, commissioned architects Skidmore, Owings & Merrill (SOM). 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 3×3 matrix forming a square base with {{convert|225|ft|m|adj=on}} sides.[13] All nine tubes would rise up to the 50th floor of the building, where the northwest and southeast tubes terminate. The northeast and southwest tubes reach the 66th floor; the north, east, and south tubes end at the 90th. The remaining west and center tubes reach 108 floors. The Sears Tower was the first building to use this innovative design. It was both structurally efficient and economic: at 1,450 feet, it provided more space and rose higher than the Empire State Building and cost much less per unit area.[14] The system would prove highly influential in skyscraper construction and has been used in most supertall buildings since, including the world's current tallest building, the Burj Khalifa.[15][16] To honor Khan's contributions, the Structural Engineers Association of Illinois commissioned a sculpture of him[17] for the lobby of the Willis Tower. Sears decided to focus their initial occupancy on housing their merchandise group, renting out the remaining space to other tenants until needed. The latter floor areas had to be designed to a smaller footprint with a high window-space to floor-space ratio to be attractive to prospective lessees. Smaller floorplates required a taller structure to yield sufficient square footage. Skidmore architects proposed a tower with large, {{convert|55000|sqft|m2|adj=on}} floors in the lower part of the building with gradually tapered floorplates in a series of setbacks, which would give the tower its distinctive look. As Sears continued to offer optimistic projections for growth, the tower's proposed floor count increased rapidly into the low hundreds, surpassing the height of New York's unfinished World Trade Center to become the world's 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 Sears. It was topped with two antennas for television and radio broadcasting. Sears and the City of Chicago approved the design and the first steel was put in place in April 1971. The structure was completed in May 1973. The construction cost about US$150 million,[18] equivalent to ${{Format price|{{Inflation|US|150|1973}}|-1}} million in {{CURRENTYEAR}} dollars.{{Inflation-fn|US}} By comparison, Taipei 101, built in 2004, cost the equivalent of US$2.21 billion in 2018 dollars.[19] Black bands appear on the tower around the 29th–32nd, 64th–65th, 88th–89th, and 104th–108th floors. These elements are louvres to ventilate the building's environmental support systems and obscure its belted trusses. Even though regulations did not require a fire sprinkler system, the building was equipped with one from the beginning. There are around 40,000 sprinkler heads in the building, installed at a cost of $4 million.[20] In February 1982, two television antennas were added to the structure, increasing its total height to {{convert|1707|ft|m|1}}. The western antenna was later extended, bringing the overall height to {{convert|1729|ft|m|0}}[2] on June 5, 2000, to improve reception of local NBC station WMAQ-TV. Suits filed to halt constructionAs the construction of the building neared the 50th floor, lawsuits for an injunction were filed seeking to stop the building from exceeding 67 floors. The suits alleged that above that point television reception would deteriorate and cause property values to plummet. The first suit was filed by the state attorney in neighboring Lake County on March 17, 1972. A second suit was filed on March 28 in Cook County Circuit Court by the villages of Skokie, Northbrook, and Deerfield, Illinois.[21] Sears filed motions to dismiss the Lake and Cook County lawsuits and on May 17, 1972, Judge LaVerne Dickson, Chief of the Lake County Circuit Court, dismissed the suit, saying, "I find nothing that gives television viewers the right to reception without interference. They will have to find some other means of ensuring reception such as taller antennas."[22] The Lake County state's attorney filed a notice of appeal to the Illinois Supreme Court, which ultimately decided in favor of Sears.[23] In his decision on June 12, Judge Charles R. Barrett contended the plaintiffs did not have a right to undistorted television reception.[24] Meanwhile, the Illinois Citizens' Committee for Broadcasting requested the Federal Communications Commission (FCC) halt construction so the building would not interfere with television reception. On May 26, 1972, the Commission declined to take action on the grounds it did not have jurisdiction. On June 30, 1972, the Illinois Supreme Court affirmed the previous rulings by Lake and Cook County Circuit Courts, by a letter order with a written opinion to follow.[25] On September 8, 1972, the United States Court of Appeals for the Seventh Circuit upheld the FCC decision.[26] The court's written opinion was filed on September 20, 1972. In affirming the lower court rulings, it held that "absent legislation to the contrary, defendant has a proprietary right to construct a building to its desired height and that completion of the project would not constitute a nuisance under the circumstances of this case." [27] Post-opening{{multiple image| align = right | direction = horizontal | header = | header_align = left/right/center | header_background = | footer = | footer_align = left/right/center | footer_background = | width = | image1 = Willis Tower night 2.jpg | width1 = 200 | alt1 = | caption1 = Willis Tower at dusk, seen from the Loop | image2 = Chicago Sears Tower.jpg | width2 = 163 | alt2 = | caption2 = Willis Tower from across the Chicago River }} Sears's optimistic growth projections were not met. Competition beyond its traditional rivals (like Montgomery Ward) arose from retailing giants including Kmart, Kohl's, and Walmart. Nor did the tower draw as many tenants as hoped. It stood half-vacant for a decade as a surplus of office space materialized in the 1980s. In 1990, the law firm of Keck, Mahin & Cate decided to move into a development that would become 77 West Wacker Drive, rebuffing Sears's attempts to entice the firm to stay.[28] Just two years later, Sears began moving its own offices out of the building.{{Citation needed|date=November 2009}} In 1994, the tower was sold to Boston-based AEW Capital Management with financing from MetLife. At that time it was one-third vacant. By 1995, Sears had completed its move to a new campus in Hoffman Estates, Illinois.[29] In 1997, Toronto-based TrizecHahn Corporation (then owner of the CN Tower) purchased the building for $110 million, assuming $4 million in liabilities and a $734 million mortgage.[30][31] In 2003, Trizec surrendered the building to lender MetLife.[32] In 2004, MetLife sold the building to a group of investors including New York-based Joseph Chetrit, Joseph Moinian; Lloyd Goldman; Joseph Cayre and Jeffrey Feil; and Skokie, Illinois-based American Landmark Properties.[33] The quoted price was $840 million, with $825 million held in a mortgage.[34] The building lost several major tenants in the early 2000s due in part to perceived terrorism risk following the September 11 attacks.[35] In June 2006, seven men were arrested by the FBI and charged with plotting to destroy the tower. Deputy FBI Director John Pistole described their plot as "more aspirational than operational".[36][37] The case went to court in October 2007;[38] after three trials, five of the suspects were convicted and two acquitted.[39] The alleged leader of the group, Narseal Batiste, was sentenced to 13½ years in prison.[40] Meanwhile the building's largest tenant at this time, Ernst & Young, moved to North Wacker Drive in early 2009.[41] In February 2009, the owners announced they were considering a plan to paint the structure silver; this plan was later dropped. The paint would have "rebranded" the building and highlighted its advances in energy efficiency for an estimated $50 million.[42] Since 2007, the owners considered building a hotel on the north side of Jackson, between Wacker and Franklin, near the entrance to the observation deck. The tower's parking garage is beneath the plaza. Building owners say the second building was considered in the original design. The plan was eventually cancelled as city zoning does not permit construction of such a tall tower there.[43] Although Sears's naming rights expired in 2003, the building continued to be called the Sears Tower for several years. In March 2009, London-based insurance broker Willis Group Holdings agreed to lease a portion of the building and obtained the naming rights.[44] On July 16, 2009, the building was officially renamed Willis Tower.[45] On August 13, 2012, United Airlines announced it would move its corporate headquarters from 77 West Wacker Drive to Willis Tower.[6] In 2015, the Blackstone Group completed purchase of the tower for a reported $1.3 billion, the highest price ever paid for a U.S. property outside New York City.[46] In 2017, Blackstone announced a $500 million "facelift" for the property to include a six-story commercial complex in the tower's plaza area.[47] =={{anchor|Skydeck|The Skydeck}}Skydeck== The Willis Tower observation deck, called the Skydeck, opened on June 22, 1974. Located on the 103rd floor at an elevation of {{convert|1353|ft|m|1}}, it is the highest observation deck in the United States and one of Chicago's most famous tourist attractions. Tourists can experience how the building sways in wind and see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan, and Wisconsin in clear conditions. Elevators reach the top in about 60 seconds, allowing occupants to feel the change in pressure as they ascend. The Skydeck competes with the John Hancock Center's observation floor a mile and a half away but reaching {{convert|323|ft|m|1}} lower. Some 1.7 million tourists visit annually. A second observation deck on the 99th floor serves as a backup. The tourist entrance can be found on the south side of the building along Jackson Boulevard. In January 2009, a major renovation of the Skydeck was begun, including the installation of retractable glass balconies which extend approximately {{convert|4|ft|m}} from the facade of the 103rd floor, overlooking South Wacker Drive. The all-glass boxes, informally dubbed "The Ledge", allow visitors to see the street below. The boxes, which can accommodate {{convert|5|ST|MT|abbr=off}}, opened to the public on July 2, 2009.[48][49] On May 29, 2014, the laminated glass flooring of one of the boxes shattered while visitors were inside but there were no injuries.[50] {{Clear}}{{multiple image| align = center | direction = horizontal | width = | header = | footer = | header_align = | footer_align = | header_background = | footer_background = | image1 = Willis Tower skyboxes.jpg | width1 = 250 | alt1 = | caption1 = Three glass bottom skyboxes (top right) on the west façade of Willis Tower at the 103rd floor | image2 = Chicago Skydeck (Unsplash).jpg | width2 = 230 | alt2 = | caption2 = View looking down from glass balcony | image3 = Willis Tower glass box.jpg | width3 = 115 | alt3 = | caption3 = Glass balcony at the skydeck }}{{Wide image|WillisTowerPanorama01.jpg|2300px|Panorama of Chicago skyline as seen from Willis Tower Skydeck||center|}}{{Panorama |image = File:SkyDeck Sunset.jpg |height = 350 |caption = Sunset on Chicago Skyline view from the Skydeck }} HeightThe Willis Tower remains the second tallest building in the Americas (after One World Trade Center) and the Western Hemisphere. With a pinnacle height of {{convert|1729|ft|m}}, it is the third-tallest freestanding structure in the Americas, {{convert|86|ft|m|1}} shorter than Toronto's CN Tower. It is the eighth-tallest freestanding structure in the world by pinnacle height. At {{convert|1482.6|ft|m|1}} tall, including decorative spires, the Petronas Twin Towers in Kuala Lumpur, Malaysia, controversially claimed to be the tallest building in the world in 1998. In the ensuing controversy, four categories of "tallest building" were created.[51] Of these, Petronas was the tallest in the category of height to the top of architectural elements, meaning spires but not antennas. Taipei 101 in Taiwan claimed the record in three of the four categories in 2004 to become recognized as the tallest building in the world. Taipei 101 surpassed the Petronas Twin Towers in spire height and the Sears Tower in roof height and highest occupied floor. The tower retained one record: its antenna exceeded Taipei 101's spire in height. In 2008, Shanghai World Financial Center claimed the records of tallest building by roof and highest occupied floor. On August 12, 2007, the Burj Khalifa in Dubai was reported by its developers to have surpassed the tower in all height categories.[52] Upon completion, One World Trade Center in New York City surpassed the Willis Tower through its structural and pinnacle heights, but not by roof, observation deck elevation, or highest occupied floor.[53] Until 2000 the tower did not hold the record for being the tallest building by pinnacle height. From 1969 to 1978, this record was held by John Hancock Center, whose antenna reached a height of {{convert|1500|ft|m|1}}, {{convert|49|ft|m|1}} taller than the Sears Tower's original height. One World Trade Center became taller by pinnacle height with the addition of a 359-foot (109.4-meter) antenna, bringing its total height to {{convert|1727|ft|m|1}}. In 1982, two antennas were installed which brought its total height to {{convert|1707|ft|m|1}}, making it taller than the John Hancock Center but not One World Trade Center. However, the extension of the tower's western antenna in June 2000 to {{convert|1729|ft|m}} allowed it to just barely claim the title of tallest building by pinnacle height. {{Clear}}Position in Chicago's skyline{{Chicago skyline}}ClimbingOn May 25, 1981, Dan Goodwin, wearing a homemade Spider-Man suit while using suction cups, camming devices, and sky hooks, and despite several attempts by the Chicago Fire Department to stop him, made the first successful outside ascent of the tower. Goodwin was arrested at the top after the seven-hour climb and was later charged with trespassing. Goodwin stated that the reason he made the climb was to call attention to shortcomings in high-rise rescue and firefighting techniques. After a lengthy interrogation by Chicago's District Attorney and Fire Commissioner, Goodwin was officially released from jail.[54][55][56] In August 1999, French urban climber Alain "Spiderman" Robert, using only his bare hands and bare feet, scaled the building's exterior glass and steel wall all the way to the top. A thick fog settled in near the end of his climb, making the last 20 stories of the building's glass and steel exterior slippery.[57] Naming rightsAlthough Sears sold the tower in 1994 and had completely vacated it by 1995, the company retained the naming rights to the building through 2003. The new owners were rebuffed in renaming deals with CDW Corp in 2005 and the U.S. Olympic Committee in 2008. London-based insurance broker Willis Group Holdings, Ltd. leased more than {{convert|140000|sqft|m2}} of space on three floors in 2009. A Willis spokesman said the naming rights were obtained as part of the negotiations at no cost to Willis[58][59][60] and the building was renamed Willis Tower on July 16, 2009.[61] The naming rights are valid for 15 years, so it is possible that the building's name could change again as soon as 2024.[62] The Chicago Tribune joked that the building's new name reminded them of the oft-repeated "What you talkin' 'bout, Willis?" catchphrase from the 1980s American television sitcom Diff'rent Strokes[61] and considered the name-change ill-advised in "a city with a deep appreciation of tradition and a healthy ego, where some Chicagoans still mourn the switch from Marshall Field's to Macy's".[63] This feeling was confirmed in a July 16, 2009 CNN article in which some Chicago area residents expressed reluctance to accept the Willis Tower name,[64] and in an article that appeared in the October 2010 issue of Chicago magazine that ranked the building among Chicago's 40 most important, the author pointedly refused to acknowledge the name change and referred to the building as the "Sears Tower".[65] Time magazine called the name change one of the top 10 worst corporate name changes and pointed to negative press coverage by local news outlets and online petitions from angry residents.[66] The naming rights issue continued into 2013, when Eric Zorn noted in the Chicago Tribute that "We're stubborn about such things. This month marked four years since the former Sears Tower was re-christened Willis Tower, and the new name has yet to stick."[67] Figures and statistics
BroadcastingMany broadcast station transmitters are located at the top of Willis Tower. Each list is ranked by height from the top down. Stations at the same height on the same mast indicate the use of a diplexer into the same shared antenna. Due to its extreme height, FM stations (all class B) are very limited in power output. Radio stations
NOAA Weather Radio station KWO39 transmits off the tower at 162.550 MHz. Programmed by the National Weather Service Weather Forecast Office in Chicago, it is equipped with Specific Area Message Encoding (SAME), which sets off a siren on specially-programmed weather radios to alert of an impending hazard. Television stations
Cultural depictionsFilm and televisionThe building has appeared in numerous films and television shows set in Chicago such as Ferris Bueller's Day Off, where Ferris and company visit the observation deck.[77] Late Night with Conan O'Brien introduced a character called The Sears Tower Dressed In Sears Clothing when the show visited Chicago in 2006.[78] The building is also featured in History Channel's Life After People, in which it and other human-made landmarks suffer from neglect without humans around, collapsing two hundred years after people are gone.[79] In an episode of the television series Monk, Adrian Monk tries to conquer his fear of heights by imagining that he is on top of the tower. In an episode of Kenan and Kel, Kenan Rockmore and Kel Kimble decide to climb to the top of the tower so Kenan can declare his love for a girl, but they end up getting stuck on a window washer's platform 110 stories up. The Chicago Franchise frequently features locations where the tower is visible in the distance. In the movie Day of Destruction, it is damaged by a tornado. In "1969", a Season 2 episode of the science-fiction series Stargate SG-1, the SG-1 team accidentally travels back in time to the titular year. At one point the team travels though Chicago and the tower is shown (erroneously, since construction did not begin on the tower until two years later in 1971). In the 2004 film I, Robot, the tower is shown updated in the year 2035 with new triangular antennas. It is portrayed as having surpassed the height of the fictional USR (United States Robotics) Building. In the 2008 film The Dark Knight, it is part of Gotham City. In the 2011 film Dark of the Moon, it is featured in a number of scenes. The most notable one is when the N.E.S.T team tries to enter the city using V-22 Osprey helicopters. They use Willis Tower for cover before using wing suits to descend into the city streets. In the 2013 film Man of Steel, the tower was the location of the offices of the Daily Planet.[80] In the 2014 film Divergent, it is shown abandoned and decayed in a future Chicago. In the 2015 film Jupiter Ascending, the tower is featured prominently as the place where Caine and Jupiter await a spaceship to lift them off the planet. In the 2018 film Rampage, the Energyne corporation is headquartered in the building and uses tower's antenna to broadcast an echolocation signal that would attract three mutated monsters. After the antenna is destroyed, the entire building topples to the ground. OtherOlder versions of Microsoft Flight Simulator would begin with the player on the runway of Meigs Field, facing a virtual version of the tower. In Sufjan Stevens' 2005 album Illinois, the tower is referenced in the track "Seer's Tower." Image gallerySee also{{Portal|Chicago|Illinois|Architecture}}{{div col|colwidth=50em}}
References1. ^{{cite news|last1=de la Merced|first1=Michael J.|title=Blackstone Group Purchases Landmark Willis Tower in Chicago|url=https://www.nytimes.com/2015/03/17/business/blackstone-group-purchases-landmark-chicago-tower.html|accessdate=August 11, 2015|work=The New York Times|date=March 16, 2014}} 2. ^1 2 3 4 5 6 7 {{cite web|title=Willis Tower – The Skyscraper Center|url=http://skyscrapercenter.com/building/willis-tower/169|work=Council on Tall Buildings and Urban Habitat|date=June 13, 2015|accessdate=June 13, 2015}} 3. ^1 {{cite web|url=http://www.willistower.com/history-and-facts|title=History and Facts - Willis Tower|work=willistower.com}} 4. ^The tower has 108 stories as counted by standard methods, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110. 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BBC News, June 23, 2006. 38. ^"Sears Tower 'plot trial' begins", BBC News, October 3, 2007. 39. ^"Five guilty in Chicago bomb plot", BBC News, May 12, 2009. 40. ^"Sears Tower bomb plot leader Narseal Batiste jailed", BBC News, November 20, 2009. 41. ^{{Cite web|url=http://www.thechicago77.com/2009/01/sears-tower-to-lose-largest-tenant/|title=Sears Tower to Lose Largest Tenant - The Chicago 77|website=www.thechicago77.com|access-date=2018-10-03}} 42. ^"Sears Tower in silver?", Chicago Sun-Times, February 25, 2009 {{webarchive |url=https://web.archive.org/web/20100217125635/http://www.suntimes.com/business/roeder/1448083,CST-FIN-roeder25.article |date=February 17, 2010 }} 43. ^[https://web.archive.org/web/20121102173519/http://www.highbeam.com/doc/1P2-8884264.html David Roeder. "Tall order for Tower?; Sears Tower owners to press city for zoning change, subsidy to add 2nd building as part of mega-million-dollar project next to landmark"], Chicago Sun-Times, October 12, 2007. Retrieved February 25, 2009 from HighBeam Research 44. ^"Sears Tower Being Renamed". Chicago Breaking News. March 12, 2009 45. ^{{cite press release|title=Tallest Building in Western Hemisphere is Renamed Willis Tower|url=http://www.willis.com/Media_Room/Press_Releases_(Browse_All)/2009/20090716_tower_unveiled/|publisher=Willis Group|date=July 16, 2009|accessdate=June 13, 2015}} 46. ^{{cite web|url=http://www.chicagobusiness.com/article/20150605/NEWS12/150609841/adding-on-to-the-willis-tower|title=Subscription Center|publisher=}} 47. ^{{Cite news|url=https://chicago.suntimes.com/business/willis-tower-in-line-for-500-million-facelift/|title=Willis Tower in line for a $500 million facelift|work=Chicago Sun-Times|access-date=2018-10-03|language=en}} 48. ^[https://www.usatoday.com/travel/destinations/2009-07-01-sears-tower-glass-balconies_N.htm "Sears Tower unveils 103rd floor glass balconies"], USA Today, July 1, 2009 49. ^{{cite web|url=http://www.som.com/content.cfm/sears_tower_observation_deck|title=The Ledge at Skydeck Chicago|access-date=May 15, 2011|archive-url=https://web.archive.org/web/20110608034757/http://www.som.com/content.cfm/sears_tower_observation_deck|archive-date=June 8, 2011|dead-url=yes|df=mdy-all}} SOM.com Project Page 50. ^{{cite web|author=BJ Lutz |url=http://www.nbcchicago.com/news/local/chicago-willis-tower-sky-deck-ledge-crack-261079001.html |title=Coating on Willis Tower Skydeck's Ledge Cracks Under Tourists |publisher=Nbcchicago.com |date=May 30, 2014 |accessdate=August 26, 2014}} 51. ^{{note label|talleststatus}}{{cite web |url=http://ctbuh.org/AboutCTBUH/History/MeasuringTall/tabid/1320/language/en-US/Default.aspx |title=Height: The History of Measuring Tall Buildings |work=Council on Tall Buildings and Urban Habitat |accessdate=May 1, 2012}} 52. ^{{cite web|url=http://www.visitdubai.info/news/burjdubai.htm |title=Burj Khalifa surpasses the height of Sears Tower in Chicago |publisher=Visitdubai.info |date=December 9, 2007 |accessdate=October 31, 2011}} 53. ^{{cite web|title=Freedom Tower ("World Trade Center 1")|url=http://www.nyc-tower.com/stats/|publisher=NYC Tower|accessdate=November 30, 2008|archive-url=https://web.archive.org/web/20081221032032/http://www.nyc-tower.com/stats/|archive-date=December 21, 2008|dead-url=yes|df=mdy-all}} 54. ^{{cite web |url=http://www.justonebadcentury.com/chicago_cubs_history_47.asp |title=Chicago Cubs History and News – Welcome to Just One Bad Century |publisher=Justonebadcentury.com |date= |accessdate=October 31, 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20120320062017/http://www.justonebadcentury.com/chicago_cubs_history_47.asp |archivedate=March 20, 2012 |df=mdy-all }} 55. ^{{cite news|author= |url=https://query.nytimes.com/gst/fullpage.html?res=9B03E2DD1538F935A15756C0A967948260 |title=Sears Tower in Chicago Is Scaled by Stunt Man |location=Chicago (Ill) |publisher=New York Times |date=May 26, 1981 |accessdate=October 31, 2011}} 56. ^{{cite web|url=https://www.youtube.com/watch?v=woD6DVOBNvU|title=Spiderman scales Sears Tower w/Stan Lee interview |work=YouTube |accessdate=January 13, 2009}} 57. ^{{cite news|url=http://www.cnn.com/US/9908/20/tower.climber/ |title='Spiderman' scales Sears Tower in Chicago – August 20, 1999 |publisher=CNN |accessdate=September 14, 2009}} 58. ^{{cite news|url=http://archives.chicagotribune.com/2009/mar/12/business/chi-biz-sears-tower-name-change-willis-march12 |title=Sears Tower name to change to Willis Tower |date=March 12, 2009 |work=Chicago Tribune |accessdate=May 1, 2009 |deadurl=yes |archiveurl=https://web.archive.org/web/20090419220724/http://archives.chicagotribune.com/2009/mar/12/business/chi-biz-sears-tower-name-change-willis-march12 |archivedate=April 19, 2009 }} 59. ^{{cite news|url=http://www.chicagotribune.com/business/chi-talk-willis-towerjul16,0,4222230.story|date=July 16, 2009|title=Sears Tower Now Willis|work=Chicago Tribune|accessdate=July 16, 2009}} 60. ^{{cite web|last=Corfman |first=Thomas A. |url=http://www.chicagorealestatedaily.com/cgi-bin/news.pl?id=33287 |title=Willis could get Sears Tower naming rights|publisher= Chicago Real Estate Daily |date=March 11, 2009 |accessdate=October 31, 2011}} 61. ^1 {{cite news|url=http://www.chicagotribune.com/business/chi-talk-willis-towerjul16,0,4222230.story|title=Sears Tower name change: Building today officially becomes Willis Tower|first=Mary Ellen|last=Podmolik |date=July 16, 2009| work=Chicago Tribune|accessdate=July 16, 2009}} 62. ^{{cite news|url=http://www.chicagotribune.com/business/chi-talk-willis-towerjul16,0,4222230.story|title=Burns on Business, Willis Wants to be Part of Chicago by Way of Jersey|first=Greg|last=Burns |date=July 16, 2009|work=Chicago Tribune|accessdate=July 16, 2009}} 63. ^{{cite journal |last1= Podmolik|first1= Mary Ellen|last2= |first2= |year= 2009 |title= Sears Tower name change has few Chicago fans – Willis Tower may have trouble winning over public|journal=Chicago Tribune|publisher=The Tribune Company|issue= March 13, 2009|url= http://www.chicagotribune.com/business/chi-fri-willis-tower-0313-mar13,0,1361480.story}} 64. ^{{cite news|url=http://www.cnn.com/2009/US/07/16/sears.tower.renamed/index.html|title=Sears Tower Now Named Willis Tower|date=July 16, 2009|publisher=CNN|accessdate=July 17, 2009}} 65. ^{{cite journal |last1= Johnson|first1= Geoffrey|last2= |first2= |year= 2010 |title= Top 40 Buildings in Chicago|journal=Chicago|publisher=The Tribune Company|issue= October 2010|url= http://www.chicagomag.com/Chicago-Magazine/October-2010/Top-40-Buildings-in-Chicago/index.php?cparticle=4&siarticle=3}} 66. ^{{cite news| url=http://www.time.com/time/specials/packages/article/0,28804,1914815_1914808_1914812,00.html| title=Top 10 Worst Corporate Name Changes: It's the Sears Tower|last=Suddath| first=Claire| work=TIME| date=February 8, 2010|accessdate=February 8, 2010}} 67. ^{{cite journal |last1= Zorn|first1=Eric|last2= |first2= |year= 2013 |title= Change of Subject – 'Thillens Stadium' is no more|journal=Chicago Tribune|publisher=The Tribune Company|issue= June 24, 2013|url= http://www.chicagotribune.com/news/local/ct-oped-0623-zorn-20130623,0,7213374.column}} 68. ^{{cite web|url=http://www.tallestbuildingintheworld.com/building_id_5_Sears+Tower.php |title=Sears Tower |publisher=Tallest Building in the World |date=September 2, 2007 |accessdate=September 14, 2009}} 69. ^{{cite web|url=http://www.whyguides.com/why-was-the-sears-tower-built.html |title=Why Was the Sears Tower Built? |publisher=Whyguides.com |date=June 5, 2000 |accessdate=October 31, 2011}} 70. ^The History Channel; Modern Marvels (series); episode: The Sears Tower 71. ^{{cite web|title=CrediFi|url=https://www.credifi.com/ui/freemium/propertydetails/property/554f6b39cbda71bac8b6d98a|website=Sears Tower|accessdate=September 19, 2016}} 72. ^{{cite web|title=100 Tallest Completed Buildings in the World|url=http://www.skyscrapercenter.com/buildings?list=tallest100-completed|website=Council on Tall Buildings & Urban Habitat|accessdate=4 October 2017}} 73. ^{{cite web|url=http://www.fcc.gov/fcc-bin/fmq?list=1&dist=.02&dlat2=41&mlat2=52&slat2=44&NS=N&dlon2=87&mlon2=38&slon2=8&EW=W&size=11 |title=FM Query Results – Audio Division (FCC) USA |publisher=Fcc.gov |date= |accessdate=September 7, 2016}} 74. ^{{cite web|url=http://www.fcc.gov/fcc-bin/fmq?list=1&dist=.02&dlat2=41&mlat2=52&slat2=44&NS=N&dlon2=87&mlon2=38&slon2=10&EW=W&size=11 |title=FM Query Results – Audio Division (FCC) USA |publisher=Fcc.gov |date= |accessdate=September 7, 2016}} 75. ^{{cite web|url=http://www.fcc.gov/fcc-bin/tvq?list=1&dist=.02&dlat2=41&mlat2=52&slat2=44&NS=N&dlon2=87&mlon2=38&slon2=8&EW=W&size=11 |title=TV Query Results – Video Division (FCC) USA |publisher=Fcc.gov |date= |accessdate=September 7, 2016}} 76. ^{{cite web|url=http://www.fcc.gov/fcc-bin/tvq?list=1&dist=.02&dlat2=41&mlat2=52&slat2=44&NS=N&dlon2=87&mlon2=38&slon2=10&EW=W&size=11 |title=TV Query Results – Video Division (FCC) USA |publisher=Fcc.gov |date= |accessdate=September 7, 2016}} 77. ^{{cite web|url=http://www.movie-locations.com/movies/f/ferris.html |title=Filming Locations for Ferris Bueller's Day Off |publisher=Movie-locations.com |accessdate=September 14, 2009}} 78. ^{{cite web|url=http://www.nbc5.com/video/9204958/index.html |title=The Sears Tower Dressed In Sears Clothing |publisher=Nbc5.com |date= |accessdate=October 31, 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20080302213015/http://www.nbc5.com/video/9204958/index.html |archivedate=March 2, 2008 }} 79. ^{{cite web|author=Keith Darcé |url=http://www.signonsandiego.com/uniontrib/20070131/news_1n31ads.html |title=Madison Avenue turns to Main Street | The San Diego Union-Tribune |publisher=Signonsandiego.com |date=January 31, 2007 |accessdate=September 14, 2009}} 80. ^{{cite web|url=http://www.chicagobusiness.com/article/20110907/NEWS07/110909951/willis-tower-cbot-building-star-in-superman-filming|title=Willis Tower, CBOT Building star in Superman filming|accessdate=July 26, 2013|date=September 7, 2011|publisher=ChicagoBusiness|author=Merrion, Paul}} External links{{Commons category|Willis Tower}}
442 m|years=1973–1998}}{{s-aft|rows=2|after=Petronas Towers}}{{s-break}}{{s-ttl|title=World's tallest building architectural element 442 m |years=1973–1998}}{{s-break}}{{s-ttl|title=Building with the most floors 108 floors|years=2001–2007}}{{s-aft|after=Burj Khalifa}}{{s-break}}{{s-ttl|title=World's tallest building rooftop 442 m|years=1973–2003}}{{s-aft|after=Taipei 101}}{{s-break}}{{s-ttl|title=Tallest building in the United States 442 m|years=1973–2013}}{{s-aft|after=One World Trade Center (2006)}}{{S-break}}{{s-bef|before=Aon Center}}{{s-ttl|title=Tallest building in Chicago 442 m|years=1973–present}}{{s-inc}}{{S-end}}{{Chicago}}{{Tallest Buildings by U.S. state|state=autocollapse}}{{Supertall skyscrapers | current}}{{Chicago skyscrapers}}{{United Airlines}}{{Buildings in Chicago timeline}} 13 : Airline company headquarters in the United States|Buildings and structures on U.S. Route 66|Central Chicago|Former world's tallest buildings|Landmarks in Chicago|Office buildings completed in 1973|Skyscraper office buildings in Chicago|Retail company headquarters in the United States|Skidmore, Owings & Merrill buildings|United Airlines|Tourist attractions along U.S. Route 66|Tourist attractions in Chicago|1973 establishments in Illinois |
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