Question: What city does Jaros, Baum & Bolles and Willis Tower have in common?
Context: 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. Torre Cuscatlán ("Cuscatlán Tower" in English; formerly known as Torre Democracia or "Tower of Democracy") is one of the tallest buildings in San Salvador, El Salvador.  Finished in 1989, it is 79 meters high and has 19 floors.  Ricardo Jiménez Castillo, who is considered one of the most representative architects of El Salvador, was in charge of the building's design.  It is influenced by modern style, using a complete glass cladding for the exterior.  The main characteristic of its design are the 3 setbacks covered with plants that run along the height of the building.  The materials used to construct the tower were aluminum, reinforced concrete and glass.  Some people believe that the tower was inspired by Willis Tower in Chicago, United States, but there is no data to confirm this. The John Hancock Center is a 100-story, 1,128-foot (343.7 m) supertall skyscraper at 875 North Michigan Avenue, Chicago, Illinois, United States.  It was constructed under the supervision of Skidmore, Owings and Merrill, with chief designer Bruce Graham and structural engineer Fazlur Khan.  When the building topped out on May 6, 1968, it was the second tallest building in the world and the tallest outside of New York City.  It is currently the fourth-tallest building in Chicago and the eighth-tallest in the United States, after One World Trade Center, the Willis Tower, 432 Park Avenue, the Trump Tower Chicago, the Empire State Building, the Bank of America Tower, and the Aon Center.  When measured to the top of its antenna masts, it stands at 1500 ft .  The building is home to offices and restaurants, as well as about 700 condominiums, and contains the third highest residence in the world, after the Burj Khalifa in Dubai and the Trump Tower in Chicago.  The building was named for John Hancock Mutual Life Insurance Company, a developer and original tenant of the building. WLS-FM (94.7 FM) is a commercial FM radio station licensed to serve Chicago, Illinois.  The station is owned by Cumulus Media, through licensee Radio License Holdings, LLC, and broadcasts a classic hits format.  WLS-FM studios is located at the NBC Tower on North Columbus Drive in the city's Streeterville neighborhood, and the station broadcasts from a tower located atop the Willis Tower at ( ). Chicago, the third-largest city in the United States, is home to 1,315 completed high-rises, 44 of which stand taller than 600 ft .  The tallest building in the city is the 108–story Willis Tower (formerly the Sears Tower), which rises 1451 ft in the Chicago Loop and was completed in 1974.  Sears Tower was the tallest building in the world from its completion, and remained the tallest building in the United States until May 10, 2013 when it was overtaken by One World Trade Center in New York City.  The second-, third- and fourth-tallest buildings in Chicago are the Trump International Hotel & Tower, the Aon Center and the John Hancock Center, respectively.  Of the ten tallest buildings in the United States, four are located in Chicago.  s of 2013 , the entire city had 105 buildings at least 500 ft tall. The Newport Tower (also known as Newport Office Center II and 525 Washington Boulevard) in Newport, Jersey City, New Jersey is the fourth tallest building in Jersey City.  It has 37 floors, it is 531 ft (162 m) tall and is connected to a mall (called the Newport Centre Mall) within the complex.  The mall is one of the few enclosed, regional shopping facilities in Hudson County.  The building was developed by Melvin Simon & Associates in 1990.  The Newport Tower is next to the Hudson River and is almost exactly across the river from the World Financial Center in Manhattan.  The Newport Tower is a modern-style building.  Its bundled tube structure is similar to that of the world-famous Willis Tower, (formerly known as "Sears Tower") in Chicago, Illinois. Central Park Tower (also known as the Nordstrom Tower and 225 West 57th Street, its address) is a supertall mixed-use commercial/residential project being developed by the Extell Development Company and Shanghai Municipal Investment Group in Midtown Manhattan, New York City.  The building will rise 1,550 ft (472 m) to the roof.  Upon completion, Central Park Tower will become the second tallest skyscraper in the United States.  The building will also be the tallest by roof height in the United States, surpassing the Willis Tower.  The building is also notable for its former proposed architectural height of 1775 ft , one foot shorter than the symbolic 1776 ft height of One World Trade Center. 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. WMAQ-TV, virtual channel 5 (UHF digital channel 29), is an NBC owned-and-operated television station licensed to Chicago, Illinois, United States.  The station is owned by the NBCUniversal Owned Television Stations subsidiary of NBCUniversal, and is part of a duopoly with Telemundo owned-and-operated station WSNS-TV (channel 44); both networks are owned by NBCUniversal, a subsidiary of Comcast, which also owns regional sports network Comcast SportsNet Chicago.  WMAQ-TV maintains studio facilities and business offices at the NBC Tower on North Columbus Drive in the city's Streeterville neighborhood, and its transmitter is located atop the Willis Tower on South Wacker Drive in the Chicago Loop. Eaton's / John Maryon Tower was a proposed supertall 140-storey office skyscraper, to be built in Toronto, Ontario, Canada.  In 1971, Eaton's was to partner with a developer named John Maryon to build a 1,650 ft tower in the College Park area of Downtown Toronto.  With a 600 ft communication mast added to the roof of the triangular glass office tower, the total proposed height was 2,250 ft .  Plans for the tower were cancelled, because building a structure of this height was considered impossible at the time of its planning.  This skyscraper was planned two years before the Willis Tower was completed, and five years before the CN Tower was completed.  Had the tower been built, it would have been the world's tallest building until 2008, when the Burj Khalifa surpassed its planned height.
Answer: Chicago