[PAR] [TLE] Willis Tower [SEP] 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. [PAR] [TLE] Jaros, Baum &amp; Bolles [SEP] 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.
[PAR] [TLE] Willis Tower [ SEP ] 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 . [PAR] [TLE] Jaros , Baum & amp ; Bolles [ SEP ] 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 .
What is the uncommon name for the Chicago tower for which Jaros, Baum, & Bolles is best known?
What is the uncommon name for the Chicago tower for which Jaros , Baum , & Bolles is best known ?
Willis Tower
Willis Tower