Willis Tower (Simple English Wikipedia)

Vinocur, Barry (December 8, 1997). "A Look at the Finer Points of the Sears Tower Sale". Barron's. Archived from the original on April 30, 2021. Retrieved July 27, 2021.

bbc.co.uk

news.bbc.co.uk

"Seven charged over 'Chicago plot'". BBC News. June 23, 2006. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Sears Tower 'plot trial' begins". BBC News. October 3, 2007. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Five guilty in Chicago bomb plot". BBC News. May 12, 2009. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Sears Tower bomb plot leader Narseal Batiste jailed". BBC News. November 20, 2009. Archived from the original on July 27, 2021. Retrieved July 26, 2021.

bisnow.com

"The Forgotten History Of Chicago Supertalls: Everything You Need To Know About Willis Tower". Bisnow. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

books.google.com

National Academy of Engineering (1979). Memorial Tributes. National Academies. ISBN 9780309034821. NAP:14723. Archived from the original on 2021-07-27. Retrieved 2021-07-27.

britannica.com

"Willis Tower". Britannica. Archived from the original on July 31, 2020. Retrieved July 27, 2021.

casetext.com

"Illinois Citizens Committee for Broadcasting v. Federal Communications Commission". Case Text. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

cbsnews.com

"Willis Tower, One World Trade Center compete for bragging rights as America's tallest skyscraper". CBS News.com. Archived from the original on November 8, 2013. Retrieved November 9, 2013.
Sophie Lewis (June 12, 2019). "Protective layer of Willis Tower's SkyDeck cracks under visitors' feet". cbsnews. Archived from the original on June 13, 2019. Retrieved June 12, 2019.

chicagobreakingnews.com

"Sears Tower Being Renamed". Chicago Breaking News. March 12, 2009. Archived from the original on March 16, 2009. Retrieved July 26, 2021.

chicagobusiness.com

Ecker, Danny (2018-04-16). "Morgan Stanley moving second office to Willis Tower". Crain's Chicago Business. Archived from the original on 2018-10-04. Retrieved 2018-10-03.
"Subscription Center". 4 June 2015. Archived from the original on 2017-01-13. Retrieved 2021-07-27.

chicagomag.com

McClelland, Edward (2019-06-05). "Chicagoans Refuse to Call These Places by Their Real Names". Chicago Magazine. Chicago Magazine. Archived from the original on 2021-05-19. Retrieved 2021-05-19.
Johnson, Geoffrey (2010). "Top 40 Buildings in Chicago". Chicago (October 2010). Archived from the original on 2018-12-24. Retrieved 2021-07-27.

chicagotribune.com

"JAPANESE STEER CLEAR OF SEARS TOWER SALE". Chicago Tribune. June 29, 1989. Archived from the original on November 9, 2021. Retrieved July 27, 2021.
"Sears Tower: Tall Bill to Fill". Chicago Tribune. Archived from the original on 2021-11-09. Retrieved July 27, 2021.
"Sears Tower likely to go to its lender". Chicago Tribune. Archived from the original on 2021-07-12. Retrieved July 27, 2021.
"Merrill Lynch moving most of its offices out of Sears Tower". Chicago Tribune. Archived from the original on 2021-11-09. Retrieved July 27, 2021.
Burns, Greg (July 16, 2009). "Burns on Business, Willis Wants to be Part of Chicago by Way of Jersey". Chicago Tribune. Archived from the original on July 3, 2012. Retrieved July 16, 2009.
Podmolik, Mary Ellen (2009). "Sears Tower name change has few Chicago fans – Willis Tower may have trouble winning over public". Chicago Tribune (March 13, 2009). Archived from the original on March 14, 2014. Retrieved July 27, 2021.

cnn.com

"Sears Tower Now Named Willis Tower". CNN. July 16, 2009. Archived from the original on July 19, 2009. Retrieved July 17, 2009.
"'Spiderman' scales Sears Tower in Chicago – August 20, 1999". CNN. Archived from the original on July 1, 2009. Retrieved September 14, 2009.
"Willis Tower Fast Facts". CNN.com. November 14, 2013. Retrieved December 8, 2013.

constructionweekonline.com

"Top 10 world's tallest steel buildings". Constructionweekonline.com. Archived from the original on March 28, 2014. Retrieved February 25, 2014.

crankyflier.com

Snyder, Brett (December 16, 2013). "A Day with United Management: Elite Status, Mileage Devaluation, and Increasing Change Fees". The Cranky Flier. Archived from the original on December 19, 2013. Retrieved December 18, 2013.

curbed.com

chicago.curbed.com

"Willis Tower says goodbye to its 'lunchbox' entrance along Wacker Drive". Chicago Curbed. 6 April 2018. Archived from the original on 30 July 2021. Retrieved 30 July 2021.

emporis.com

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. Emporis.com Archived 2008-03-17 at the Wayback Machine Retrieved on June 7, 2008

enjoyillinois.com

"Skydeck Chicago - The Ledge". Enjoy Illinois. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

examiner.com

"One World Trade Center taller than Willis Tower". Examiner.com. Archived from the original on October 31, 2015. Retrieved November 12, 2013.

famousdaily.com

"Sears Tower is Completed". Famous Daily. Archived from the original on April 11, 2021. Retrieved July 27, 2021.

fireengineering.com

"The Chicago Tragedy". Fire Engineering. December 2003. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

globalconstructionreview.com

"SOM completes overhaul of Chicago tower, formerly tallest building in the world". Global Construction Review. 27 April 2021. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

highbeam.com

"77 W. Wacker ready to go". Chicago Sun-Times. March 12, 1990. Archived from the original on 2012-11-02. Retrieved July 26, 2021.
"BIZ BRIEFS". Chicago Sun-Times. May 1, 2004. Archived from the original on 2012-10-26. Retrieved July 26, 2021.
"MetLife to Complete Sale of Chicago's Sears Tower". Chicago Tribune. April 30, 2004. Archived from the original on 2012-10-26. Retrieved July 26, 2021.
"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. Archived from the original on 2012-11-02. Retrieved July 26, 2021.

independent.co.uk

"Five things you need to know about pioneering architect Fazlur Rahman Khan". The Independent. London. April 3, 2017. Archived from the original on April 4, 2020. Retrieved July 27, 2021.

justfunfacts.com

"Interesting Facts About the Sears Tower". JFF. 30 October 2016. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

justonebadcentury.com

"Chicago Cubs History and News – Welcome to Just One Bad Century". Justonebadcentury.com. Archived from the original on March 20, 2012. Retrieved October 31, 2011.

latimes.com

"Sears Tower's Price Tag Seen Topping $1 Billion". Los Angeles Times. November 1988. Archived from the original on 2021-07-27. Retrieved July 27, 2021.

mentalfloss.com

"14 Things You Might Not Know About the Sears/Willis Tower". Mental Floss. 25 August 2015. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

nbcchicago.com

BJ Lutz (May 30, 2014). "Coating on Willis Tower Skydeck's Ledge Cracks Under Tourists". Nbcchicago.com. Archived from the original on June 15, 2019. Retrieved August 26, 2014.

news-gazette.com

[1] Archived August 15, 2012, at the Wayback Machine

newspapers.com

"December 2, 1973: Chicago Tribune from Chicago, Illinois · Page 740". Newspapers. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

nytimes.com

de la Merced, Michael J. (March 16, 2014). "Blackstone Group Purchases Landmark Willis Tower in Chicago". The New York Times. Archived from the original on October 27, 2015. Retrieved August 11, 2015.
McGeehan, Patrick (12 November 2013). "One World Trade Center is Ruled Tallest Building in the U.S." The New York Times. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
Holusha, John (22 January 1995). "Technology; The Sears Tower Challenge". The New York Times. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"New Amenities for World's Tallest Building". The New York Times. 8 April 1984. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"FBI Killed Plot in Talking Stage". The New York Times. June 24, 2006. Archived from the original on July 27, 2021. Retrieved July 26, 2021.

query.nytimes.com

"Sears Tower in Chicago Is Scaled by Stunt Man". New York Times. May 26, 1981. Archived from the original on February 18, 2008. Retrieved October 31, 2011.

pbs.org

"Databank: Sears Tower". Wonders of the World. November 19, 2007. Archived from the original on November 6, 2011. Retrieved July 26, 2021.

pennlive.com

"Sears & Roebuck through the years: From watches to catalogs to Kmart to bankruptcy". Pennlive. 14 January 2019. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

robertfeder.com

"Flooding at Willis Tower knocks TV, radio signals off the air". May 20, 2020. Archived from the original on August 2, 2021. Retrieved August 2, 2021.

searstower.org

"Sears Tower may be for sale". Crains Chicago Business. October 31, 1997. Archived from the original on 2001-12-14. Retrieved July 26, 2021.
"Trizec to sell its last local asset". Crain's Chicago Business. September 27, 2006. Archived from the original on 2001-12-14. Retrieved July 26, 2021.

skyscrapercenter.com

"Willis Tower – The Skyscraper Center". Council on Tall Buildings and Urban Habitat. June 13, 2015. Archived from the original on December 23, 2019. Retrieved June 13, 2015.
"Willis Tower - The Skyscraper Center". www.skyscrapercenter.com. Archived from the original on 2021-01-28. Retrieved 2021-01-20.

som.com

"WILLIS TOWER (FORMERLY SEARS TOWER)". SOM. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

suntimes.com

"Sears Tower in silver?". Chicago Sun-Times. February 25, 2009. Archived from the original on February 17, 2010.

chicago.suntimes.com

"Willis Tower in line for a $500 million facelift". Chicago Sun-Times. Archived from the original on 2018-10-04. Retrieved 2018-10-03.

telegraph.co.uk

"Burj Dubai: The new pinnacle of vanity". Telegraph. Archived from the original on May 31, 2019. Retrieved February 25, 2014.

thechicago77.com

"Sears Tower to Lose Largest Tenant - The Chicago 77". www.thechicago77.com. 9 January 2009. Archived from the original on 2018-10-04. Retrieved 2018-10-03.

theskydeck.com

"CHICAGO NEIGHBORHOODS: WEST LOOP". The Skydeck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"DARE TO STAND OUT". Skydeck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Willis Tower Fun Facts | Fun Facts for Children". Skydeck Chicago. Archived from the original on 2020-10-23. Retrieved 2020-11-08.
"Directions to the Skydeck". The Sky Deck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"THE HOWS, WHATS AND WOWS OF THE WILLIS TOWER" (PDF). The Sky Deck. Archived (PDF) from the original on May 13, 2014. Retrieved July 27, 2021.
"THE ULTIMATE CHICAGO EVENT VENUE: WILLIS TOWER'S 99TH FLOOR". The Skydeck. Archived from the original on July 30, 2021. Retrieved July 30, 2021.

time.com

"The Tallest Skyscraper". Time. June 11, 1973. Archived from the original on 2008-03-08. Retrieved July 26, 2021.
Suddath, Claire (February 8, 2010). "Top 10 Worst Corporate Name Changes: It's the Sears Tower". TIME. Archived from the original on February 22, 2010. Retrieved February 8, 2010.

usatoday.com

"The world's tallest buildings aren't being built in the USA anymore". USA Today. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Sears Tower unveils 103rd floor glass balconies". USA Today. July 1, 2009. Archived from the original on July 24, 2012. Retrieved July 26, 2021.

valuewalk.com

"A CASE STUDY OF THE DEVELOPMENT, RE-FINANCINGS AND SALE OF NORTH AMERICA'S TALLEST BUILDING" (PDF). tribunedigital-chicagotribune. Archived from the original on 2021-11-09. Retrieved 2018-02-09.

web.archive.org

de la Merced, Michael J. (March 16, 2014). "Blackstone Group Purchases Landmark Willis Tower in Chicago". The New York Times. Archived from the original on October 27, 2015. Retrieved August 11, 2015.
"Willis Tower – The Skyscraper Center". Council on Tall Buildings and Urban Habitat. June 13, 2015. Archived from the original on December 23, 2019. Retrieved June 13, 2015.
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. Emporis.com Archived 2008-03-17 at the Wayback Machine Retrieved on June 7, 2008
"Willis Tower - The Skyscraper Center". www.skyscrapercenter.com. Archived from the original on 2021-01-28. Retrieved 2021-01-20.
"History and Facts - Willis Tower". willistower.com. Archived from the original on 2021-07-22. Retrieved 2021-07-27.
"Five things you need to know about pioneering architect Fazlur Rahman Khan". The Independent. London. April 3, 2017. Archived from the original on April 4, 2020. Retrieved July 27, 2021.
[1] Archived August 15, 2012, at the Wayback Machine
Snyder, Brett (December 16, 2013). "A Day with United Management: Elite Status, Mileage Devaluation, and Increasing Change Fees". The Cranky Flier. Archived from the original on December 19, 2013. Retrieved December 18, 2013.
Ecker, Danny (2018-04-16). "Morgan Stanley moving second office to Willis Tower". Crain's Chicago Business. Archived from the original on 2018-10-04. Retrieved 2018-10-03.
McClelland, Edward (2019-06-05). "Chicagoans Refuse to Call These Places by Their Real Names". Chicago Magazine. Chicago Magazine. Archived from the original on 2021-05-19. Retrieved 2021-05-19.
"Sears & Roebuck through the years: From watches to catalogs to Kmart to bankruptcy". Pennlive. 14 January 2019. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"CHICAGO NEIGHBORHOODS: WEST LOOP". The Skydeck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"14 Things You Might Not Know About the Sears/Willis Tower". Mental Floss. 25 August 2015. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Sears Tower is Completed". Famous Daily. Archived from the original on April 11, 2021. Retrieved July 27, 2021.
"WILLIS TOWER (FORMERLY SEARS TOWER)". SOM. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"JAPANESE STEER CLEAR OF SEARS TOWER SALE". Chicago Tribune. June 29, 1989. Archived from the original on November 9, 2021. Retrieved July 27, 2021.
"The Tallest Skyscraper". Time. June 11, 1973. Archived from the original on 2008-03-08. Retrieved July 26, 2021.
"Willis Tower". Architecture. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
National Academy of Engineering (1979). Memorial Tributes. National Academies. ISBN 9780309034821. NAP:14723. Archived from the original on 2021-07-27. Retrieved 2021-07-27.
"Burj Dubai: The new pinnacle of vanity". Telegraph. Archived from the original on May 31, 2019. Retrieved February 25, 2014.
"Top 10 world's tallest steel buildings". Constructionweekonline.com. Archived from the original on March 28, 2014. Retrieved February 25, 2014.
"AN AMERICAN ICON WITH A RICH HISTORY". Willis Tower. Archived from the original on July 22, 2021. Retrieved July 27, 2021.
McGeehan, Patrick (12 November 2013). "One World Trade Center is Ruled Tallest Building in the U.S." The New York Times. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"The world's tallest buildings aren't being built in the USA anymore". USA Today. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"A BEACON FOR THE WORLD TO SEE". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Databank: Sears Tower". Wonders of the World. November 19, 2007. Archived from the original on November 6, 2011. Retrieved July 26, 2021.
"Willis Tower". Britannica. Archived from the original on July 31, 2020. Retrieved July 27, 2021.
"The Chicago Tragedy". Fire Engineering. December 2003. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Sears Tower's Price Tag Seen Topping $1 Billion". Los Angeles Times. November 1988. Archived from the original on 2021-07-27. Retrieved July 27, 2021.
"The Forgotten History Of Chicago Supertalls: Everything You Need To Know About Willis Tower". Bisnow. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"December 2, 1973: Chicago Tribune from Chicago, Illinois · Page 740". Newspapers. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Illinois Citizens Committee for Broadcasting v. Federal Communications Commission". Case Text. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
Holusha, John (22 January 1995). "Technology; The Sears Tower Challenge". The New York Times. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Sears Tower: Tall Bill to Fill". Chicago Tribune. Archived from the original on 2021-11-09. Retrieved July 27, 2021.
"New Amenities for World's Tallest Building". The New York Times. 8 April 1984. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Willis Tower says goodbye to its 'lunchbox' entrance along Wacker Drive". Chicago Curbed. 6 April 2018. Archived from the original on 30 July 2021. Retrieved 30 July 2021.
"Sears Tower likely to go to its lender". Chicago Tribune. Archived from the original on 2021-07-12. Retrieved July 27, 2021.
"A CASE STUDY OF THE DEVELOPMENT, RE-FINANCINGS AND SALE OF NORTH AMERICA'S TALLEST BUILDING" (PDF). tribunedigital-chicagotribune. Archived from the original on 2021-11-09. Retrieved 2018-02-09.
"77 W. Wacker ready to go". Chicago Sun-Times. March 12, 1990. Archived from the original on 2012-11-02. Retrieved July 26, 2021.
Vinocur, Barry (December 8, 1997). "A Look at the Finer Points of the Sears Tower Sale". Barron's. Archived from the original on April 30, 2021. Retrieved July 27, 2021.
"Sears Tower may be for sale". Crains Chicago Business. October 31, 1997. Archived from the original on 2001-12-14. Retrieved July 26, 2021.
"Merrill Lynch moving most of its offices out of Sears Tower". Chicago Tribune. Archived from the original on 2021-11-09. Retrieved July 27, 2021.
"Trizec to sell its last local asset". Crain's Chicago Business. September 27, 2006. Archived from the original on 2001-12-14. Retrieved July 26, 2021.
"BIZ BRIEFS". Chicago Sun-Times. May 1, 2004. Archived from the original on 2012-10-26. Retrieved July 26, 2021.
"MetLife to Complete Sale of Chicago's Sears Tower". Chicago Tribune. April 30, 2004. Archived from the original on 2012-10-26. Retrieved July 26, 2021.
"FBI Killed Plot in Talking Stage". The New York Times. June 24, 2006. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Seven charged over 'Chicago plot'". BBC News. June 23, 2006. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Sears Tower 'plot trial' begins". BBC News. October 3, 2007. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Five guilty in Chicago bomb plot". BBC News. May 12, 2009. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Sears Tower bomb plot leader Narseal Batiste jailed". BBC News. November 20, 2009. Archived from the original on July 27, 2021. Retrieved July 26, 2021.
"Sears Tower to Lose Largest Tenant - The Chicago 77". www.thechicago77.com. 9 January 2009. Archived from the original on 2018-10-04. Retrieved 2018-10-03.
"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. Archived from the original on 2012-11-02. Retrieved July 26, 2021.
"Sears Tower in silver?". Chicago Sun-Times. February 25, 2009. Archived from the original on February 17, 2010.
"Subscription Center". 4 June 2015. Archived from the original on 2017-01-13. Retrieved 2021-07-27.
"Willis Tower in line for a $500 million facelift". Chicago Sun-Times. Archived from the original on 2018-10-04. Retrieved 2018-10-03.
"Flooding at Willis Tower knocks TV, radio signals off the air". May 20, 2020. Archived from the original on August 2, 2021. Retrieved August 2, 2021.
"Sears Tower Being Renamed". Chicago Breaking News. March 12, 2009. Archived from the original on March 16, 2009. Retrieved July 26, 2021.
"Tallest Building in Western Hemisphere is Renamed Willis Tower". Willis Group. July 16, 2009. Archived from the original on June 13, 2015. Retrieved June 13, 2015.
Podmolik, Mary Ellen (2009). "Sears Tower name change has few Chicago fans – Willis Tower may have trouble winning over public". Chicago Tribune (March 13, 2009). Archived from the original on March 14, 2014. Retrieved July 27, 2021.
"Sears Tower Now Named Willis Tower". CNN. July 16, 2009. Archived from the original on July 19, 2009. Retrieved July 17, 2009.
Johnson, Geoffrey (2010). "Top 40 Buildings in Chicago". Chicago (October 2010). Archived from the original on 2018-12-24. Retrieved 2021-07-27.
Suddath, Claire (February 8, 2010). "Top 10 Worst Corporate Name Changes: It's the Sears Tower". TIME. Archived from the original on February 22, 2010. Retrieved February 8, 2010.
"Sears Tower in Chicago Is Scaled by Stunt Man". New York Times. May 26, 1981. Archived from the original on February 18, 2008. Retrieved October 31, 2011.
"Chicago Cubs History and News – Welcome to Just One Bad Century". Justonebadcentury.com. Archived from the original on March 20, 2012. Retrieved October 31, 2011.
"Spiderman scales Sears Tower w/Stan Lee interview". YouTube. Archived from the original on April 2, 2014. Retrieved January 13, 2009.
"'Spiderman' scales Sears Tower in Chicago – August 20, 1999". CNN. Archived from the original on July 1, 2009. Retrieved September 14, 2009.
Pathieu, Diane (4 November 2019). "Hundreds of stair climbers reach new heights for annual SkyRise Chicago at Willis Tower". ABC 7 Chicago. Archived from the original on 5 November 2019. Retrieved 10 May 2020.
"Willis Tower". PBS. 21 October 2011. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Interesting Facts About the Sears Tower". JFF. 30 October 2016. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Elevator Modernization". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"SOM completes overhaul of Chicago tower, formerly tallest building in the world". Global Construction Review. 27 April 2021. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"DARE TO STAND OUT". Skydeck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Willis Tower, One World Trade Center compete for bragging rights as America's tallest skyscraper". CBS News.com. Archived from the original on November 8, 2013. Retrieved November 9, 2013.
"One World Trade Center taller than Willis Tower". Examiner.com. Archived from the original on October 31, 2015. Retrieved November 12, 2013.
"Willis Tower Fun Facts | Fun Facts for Children". Skydeck Chicago. Archived from the original on 2020-10-23. Retrieved 2020-11-08.
"Skydeck Chicago - The Ledge". Enjoy Illinois. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Directions to the Skydeck". The Sky Deck. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"THE HOWS, WHATS AND WOWS OF THE WILLIS TOWER" (PDF). The Sky Deck. Archived (PDF) from the original on May 13, 2014. Retrieved July 27, 2021.
"THE ULTIMATE CHICAGO EVENT VENUE: WILLIS TOWER'S 99TH FLOOR". The Skydeck. Archived from the original on July 30, 2021. Retrieved July 30, 2021.
"Sears Tower unveils 103rd floor glass balconies". USA Today. July 1, 2009. Archived from the original on July 24, 2012. Retrieved July 26, 2021.
BJ Lutz (May 30, 2014). "Coating on Willis Tower Skydeck's Ledge Cracks Under Tourists". Nbcchicago.com. Archived from the original on June 15, 2019. Retrieved August 26, 2014.
Sophie Lewis (June 12, 2019). "Protective layer of Willis Tower's SkyDeck cracks under visitors' feet". cbsnews. Archived from the original on June 13, 2019. Retrieved June 12, 2019.
"WILLIS TOWER EARNS EPA'S ENERGY STAR® CERTIFICATION FOR SUPERIOR ENERGY EFFICIENCY". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

willis.com

"Tallest Building in Western Hemisphere is Renamed Willis Tower". Willis Group. July 16, 2009. Archived from the original on June 13, 2015. Retrieved June 13, 2015.

willistower.com

"History and Facts - Willis Tower". willistower.com. Archived from the original on 2021-07-22. Retrieved 2021-07-27.
"AN AMERICAN ICON WITH A RICH HISTORY". Willis Tower. Archived from the original on July 22, 2021. Retrieved July 27, 2021.
"A BEACON FOR THE WORLD TO SEE". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"Elevator Modernization". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.
"WILLIS TOWER EARNS EPA'S ENERGY STAR® CERTIFICATION FOR SUPERIOR ENERGY EFFICIENCY". Willis Tower. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

wttw.com

interactive.wttw.com

"Willis Tower". PBS. 21 October 2011. Archived from the original on July 27, 2021. Retrieved July 27, 2021.

youtube.com

"Spiderman scales Sears Tower w/Stan Lee interview". YouTube. Archived from the original on April 2, 2014. Retrieved January 13, 2009.