Question: What is the uncommon name for the Chicago tower for which Jaros, Baum, & Bolles is best known?

Context paragraphs:
Michael Baum (entrepreneur): Michael Baum (born May 28, 1962) is an American entrepreneur, investor and philanthropist.  He is best known as the Founder & CEO of Splunk a big data software technology used for understanding machine-generated data primarily for systems management, security forensics, compliance reporting and real-time operational intelligence.  Baum is the founder of six technology start-ups, five of which have been acquired and one (NASDAQ: SPLK) which went public.  He has also been a Venture Capital investor with Rembrandt Venture Partners, Advent International and Crosspoint Venture Partners.  Baum graduated with a computer science degree from Drexel University and an MBA from The Wharton School at the University of Pennsylvania.

Tom Baum: Thomas “Tom” Baum (born 1940 in New York) is an American playwright and screenwriter best known for writing "The Sender" and "Carny," both of which he wrote directly for the screen.  He lives in Los Angeles with his producer wife, Carol Baum.  He has two sons and three grandchildren.

Willis Tower: The Willis Tower, built as and still commonly referred to as the Sears Tower, is a 110-story, 442.1 m skyscraper in Chicago, Illinois, United States.  At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years and remained the tallest building in the Western Hemisphere until 2014 and the completion of a new building at the World Trade Center site.  The building is considered a seminal achievement for its architect Fazlur Rahman Khan.  The Willis Tower is the second-tallest building in the United States 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 part of its lease on a portion of the tower's space.

Jiří Baum: Jiří Baum (20 September 1900 – 1944, Warsaw) was a Czech zoologist, museum curator, explorer and writer.  He served as the director of the zoological department of the National Museum in Prague and is best known in his field for his 1933 book "Through the African Wilderness" and his 1935 zoological expedition in the Australian outback.  In Australia, Baum teamed with Walter Drowley Filmer due to his local expertise with spiders.

Frederic Chapin: Frederic Chapin (December 1, 1873 – December 27, 1947) was an American composer and writer best known for his work with L. Frank Baum on "The Woggle-Bug", a 1905 musical based on Baum's novel, "The Marvelous Land of Oz".  His popular work "The Storks" (1902) with Guy F. Steeley led to his work with Baum, as he was recommended by M. Witmark & Sons, the publisher.  He also wrote songs with lyricist Arthur Gillespie, two of which appeared, credited to Baum, in "The Woggle-Bug".

Prince Silverwings: Prince Silverwings and Other Stories is a 1902 children's book by Edith Ogden Harrison.  The book is best known because she collaborated with L. Frank Baum on an uncompleted stage adaptation of the book as a musical extravaganza.  Baum composed music for the play as well, and at least one of these songs, "Down Among the Marshes," survives and has been recorded by James Patrick Doyle on his 1999 album, "", and Baum scholar Michael O. Riley published a complete edition of their "Scenario and General Synopsis" for the play through the Pamami Press in 1982 in a limited run of 125 copies in white cloth bound in purple with illustrations by Dick Martin.  It is otherwise known only from a typescript in the Chicago Historical Society.

Nathaniel D. Mann: Nathaniel D. Mann was an American composer best known for his work with L. Frank Baum.  He composed at least two songs with Baum, "Different Ways of Making Love" and "It Happens Ev'ry Day," and another with John Slavin, "She Didn't Really Mind the Thing at All," for "The Wizard of Oz" stage musical in 1902, and in 1908, composed the first original film score (27 cues) for "The Fairylogue and Radio-Plays", one of the earliest feature-length fiction films (and the earliest film adaptations of the novels "The Wonderful Wizard of Oz", "The Marvelous Land of Oz", "Ozma of Oz", "John Dough and the Cherub", and "Dorothy and the Wizard in Oz", presented by Baum himself), which debuted September 24, 1908.  With Baum, he also composed the musical "The King of Gee-Whiz" (dated February 23, 1905), which went through various titles such as "Montezuma" (November 1902), "King Jonah XIII" (September 1903), and "The Son of the Sun" (1905).  This was collaboration with and based on a novel by Emerson Hough, which was never completed and the extant scenario published in 1969.

Jaros, Baum &amp; Bolles: Jaros, Baum & Bolles (JB&B) is an American MEP (Mechanical, electrical, and plumbing) and building systems engineering firm founded in 1915 by Alfred L. Jaros, Jr. and Albert L. Baum.  The firm is best known for high-rise projects, including One World Trade Center and Hudson Yards in New York City, the Sears Tower in Chicago and the Bank of China Tower in Hong Kong.

The Fate of a Crown: The Fate of a Crown is a 1905 adventure novel written by L. Frank Baum, the author best known for his Oz books.  It was published under the pen name "Schuyler Staunton", one of Baum's several pseudonyms.  (Baum arrived at the name by adding one letter to the name of his late maternal uncle Schuyler Stanton.)

Ryan Dowell Baum: Ryan Dowell Baum (born Ryan Sommers Baum; April 26, 1983) is an American former child actor, best known as J.B. Halliburton on the Disney Channel original series "The Famous Jett Jackson".  He is currently an ordained minister in the United Church of Christ, Iowa Conference, currently pastor at First Congregational United Church of Christ, Sioux City, Iowa.

Supporting paragraphs: Jaros, Baum &amp; Bolles Willis Tower
Answer: Willis Tower