The Loop is Chicago's main business district and central downtown core, getting its name from the elevated "L"
train tracks that have surrounded the area since 1897. The area underwent major redevelopment and emerged as Chicago's
commercial and business center after the Great Chicago Fire 1871, and continues to evolve, blending historic buildings with
modern high-rise and now becoming the city’s economic and cultural core. As such, The Loop has become a hub for retail, theater,
finance and office space for rent.
Famous offices in The Loop include the world's first skyscrapers like the Rookery Building (209 S. LaSalle St.) and the
Monadnock Building (53 W. Jackson Blvd.),
which was the world's largest office building when it opened in 1891. Other historic buildings, such as the
Willis Tower (233 S. Wacker Dr.),
formerly the tallest building in the world, and the Chicago Board of Trade Building (141 W. Jackson Blvd.), a symbol of the
city's financial power, are located in The Loop.