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The Clark Adams Building, also known as the Bankers Building, is a skyscraper located at 105 West Adams Street in Chicago, Illinois. The building was designed by the Burnham Brothers who designed other buildings in Chicago such as the Carbide and Carbon Building. The building stands at 476 feet tall and has 41 floors. Construction of the Clark Adams Building began in 1926 and was completed in 1927.

The Field Building, also known as the LaSalle National Bank Building and Bank of America Building is an art deco office building at 135 South LaSalle Street in the Loop community area of Chicago, Illinois in the United States. The building was designated a Chicago Landmark February 9, 1994.

The Grand Pacific Hotel was one of the first two prominent hotels built in Chicago, Illinois, after the Great Chicago Fire. The hotel, designed by William W. Boyington and managed for more than 20 years by John Drake, was located on the block bounded by Clark Street, LaSalle, Quincy and Jackson. It was a replacement for the Paficic Hotel, which had been built in 1871 (also designed by Boyington), only to burn in the fire later that year.Drake hosted "Great Game Dinners" featuring exotic cuisines at this hotel. These dinners were a Chicago social institution for more than 50 years. Newspapers devoted 4 inches to its menu and guests.Along with contemporary Chicago luxury hotels such as the Palmer House, Tremont House, and Sherman House, it was built in the palazzo architectural style of the day. The hotel also accommodated wealthy permanent residents in addition to transient guests who enjoyed the palace hotel.Many notable celebrities stayed here, including Oscar Wilde on his first visit to Chicago as part of his 1882 lecture tour of America. James A. Garfield stayed at the hotel during the 1880 Republican National Convention, during which time he was nominated on the 34th ballot to represent the party in the election for President of the United States. The hotel was the site where Standard time was adopted on October 11, 1883.The western half of the 1873 structure was demolished in 1895 in order to make way for the Illinois Trust and Savings Bank building. The remaining eastern half was remodeled by the architectural firm Jenney and Mundie. It reopened March 12, 1898, with 188 rooms, and remained open until 1921. In 1921, it was demolished to make way for the Continental Illinois Bank building.

Area code 312 is the telephone area code for downtown Chicago, which includes the Chicago Loop and its immediate environs. The plan area is completely surrounded by area code 773, which serves the rest of Chicago. Both area codes are overlaid with area code 872. 312 is an enclave area code, similar to area code 514 in Montreal and area code 210 in San Antonio. It is roughly bounded by North Avenue on the north, Western Avenue on the west, and 35th Street on the south, with Lake Michigan to the east. In terms of geographic area covered, 312 is one of the smallest area codes in the nation, encompassing only a few square miles.

Area code 773 serves Chicago, Illinois, outside the Loop and the innermost neighborhoods. Originally, all of Chicago and its suburbs were in area code 312. Then, in 1989, area code 708 was created for the suburbs, leaving the city itself in area code 312. By the mid-1990s, Chicago's continued growth and the proliferation of cell phones and pagers made it apparent that the city needed a new area code. It was decided to split off all of the city outside the downtown area as 773. The new area code went into effect on October 12, 1996. Permissive dialing of 312 continued across Chicago until January 11, 1997. On August 10, 2007, the Illinois Commerce Commission announced that area code 872 would overlay area codes 312 and 773; it went into service on November 7, 2009. The Illinois side of the Chicago area–312/773/872, 708, 847/224, 630/331 and portions of 815/779–is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied from one portion of the metro area to another.

Area code 872 is a North American Numbering Plan overlay of telephone area codes 312 and 773 in Chicago, Illinois, and entered service on November 7, 2009. Its overlay status means it is assigned only to new numbers in the area and not to existing numbers using the 312 and 773 area codes. It is the third overlay area code in the region and the tenth area code to serve northeast Illinois.As early as 1998, Neustar, which administers the North American Numbering Plan, had recommended a third area code for Chicago, estimating that 312 and 773 would both exhaust by 2001. However, the Illinois Commerce Commission implemented a series of conservation measures that staved off the need for a new area code. By 2008, a combination of population growth and a large growth in cell phone usage forced the implementation of 872.With the implementation of 872, all local calls in Chicago must be dialed with the full 11-digit phone number (10 digits from cell phones).The Illinois side of the Chicago area–312/773/872, 708/464, 847/224, 630/331 and portions of 815/779–is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied from one portion of the metro area to another.

The Home Insurance Building was a skyscraper that stood in Chicago from 1885 to 1931. Originally ten stories and 138 ft (42.1 m) tall, it was designed by William Le Baron Jenney in 1884 and completed the next year. Two floors were added in 1891, bringing its now finished height to 180 feet (54.9 meters). It was the first tall building to be supported both inside and outside by a fireproof structural steel frame, though it also included reinforced concrete. It is considered the world's first skyscraper. The building opened in 1885 and was demolished 46 years later in 1931.

The Federal Reserve Bank of Chicago (informally the Chicago Fed) is one of twelve regional Reserve Banks that, along with the Federal Reserve Board of Governors, make up the United States' central bank. The Chicago Reserve Bank serves the Seventh Federal Reserve District, which encompasses the northern portions of Illinois and Indiana, southern Wisconsin, the Lower Peninsula of Michigan, and the state of Iowa. In addition to participation in the formulation of monetary policy, each Reserve Bank supervises member banks and bank holding companies, provides financial services to depository institutions and the U.S. government, and monitors economic conditions in its District.

The Rookery Building is a historic office building located at 209 South LaSalle Street in the Chicago Loop. Completed by architects Daniel Burnham and John Wellborn Root of Burnham and Root in 1888, it is considered one of their masterpiece buildings, and was once the location of their offices. The building is 181 feet (55 m) in height, twelve stories tall, and is considered the oldest standing high-rise in Chicago. It has a unique construction style featuring exterior load-bearing walls and an interior steel frame, providing a transition between accepted and new building techniques. The lobby was remodeled in 1905 by Frank Lloyd Wright. From 1989 to 1992, the lobby was restored to Wright's design. The building was designated a Chicago Landmark on July 5, 1972, and was added to the National Register of Historic Places on April 17, 1970 and listed as a National Historic Landmark on May 15, 1975.

The Continental and Commercial National Bank is a historic office building located at 208 S. LaSalle Street in Chicago's Loop. The 21-story building was built in 1911-14 for the Continental and Commercial National Bank, at the time one of the largest banks in the nation. Architect Daniel Burnham designed the building in the Classical Revival style; Burnham, who was perhaps best known for his 1909 plan of Chicago, was a proponent of the style and used it in office buildings in multiple cities. The building's main entrance features a three-story colonnade with eight Doric columns; the eighteenth through the twentieth floors feature a matching colonnade, which forms the building's capital. A frieze and belt course separate the fourth and seventeenth floors from the shaft of the building, giving the building a small amount of horizontal emphasis. An open court occupies the center of the building, allowing natural light to reach its interior offices.The building was added to the National Register of Historic Places on February 14, 2007.Prior to merging with the Continental National Bank to form the Continental and Commercial Nation Bank, the Commercial National Bank was previously located in the now landmark Commercial National Bank Building.

The Marquette Building, completed in 1895, is a Chicago landmark that was built by the George A. Fuller Company and designed by architects Holabird & Roche. The building is currently owned by the John D. and Catherine T. MacArthur Foundation. It is located in the community area known as the "Loop" in Cook County, Illinois, United States. The building was one of the early steel frame skyscrapers of its day, and is considered one of the best examples of the Chicago School of architecture. The building originally had a reddish, terra cotta exterior that, prior to restoration, was somewhat blackened due to decades of Loop soot. It is noted both for its then cutting edge frame and its ornate interior. Since construction, the building has received numerous awards and honors. It was designated a Chicago Landmark on June 9, 1975, and is considered an architectural masterpiece. It was added to the National Register of Historic Places on August 17, 1973 and named a National Historic Landmark on January 7, 1976. The building's preservation has been a major focus of the Landmarks Preservation Council of Illinois. The John D. and Catherine T. MacArthur Foundation completed an extensive four-year restoration in 2006.

LaSalle Street is a major north-south street in Chicago named for Robert de La Salle, a 17th century French explorer of the Illinois Country. The portion that runs through the Chicago Loop is considered to be Chicago's financial district.