Chicago Many other architects have left their impression on the Chicago skyline such as Daniel Burnham, Louis Sullivan, Charles B. Atwood, John Root, and Helmut Jahn. The Merchandise Mart, once first on the list of largest buildings in the world, currently listed as 44th-largest (), had its own zip code until 2008, and stands near the junction of the North and South branches of the Chicago River. Presently, the four tallest buildings in the city are Willis Tower (formerly the Sears Tower, also a building with its own zip code), Trump International Hotel and Tower, the Aon Center (previously the Standard
Chase Tower (Chicago) Chase Tower (Chicago) Chase Tower, located in the Chicago Loop area of Chicago, in the U.S. state of Illinois at 10 South Dearborn Street, is a 60-story skyscraper completed in 1969. At 869 feet (259 m) tall, it is the eleventh-tallest building in Chicago, the tallest building inside the Chicago 'L' Loop elevated tracks, and the 40th-tallest in the United States. Chase Bank has its U.S. and Canada commercial and retail banking headquarters here. The building is also the headquarters of Exelon. The building and its plaza (known as Exelon Plaza) occupy the entire block bounded by Clark, Dearborn, Madison,