New York Stock Exchange Founded: 1817 Owner: Intercontinental Exchange Address: 11 Wall Street, Lower Manhattan, New York City Market capitalisation: $16.61 trillion The neo-classical architecture of the building, by George B Post, was selected from among eight entries in a competition to design the exchange in 1901. The building was completed in 1903, for $4 million, after many overruns and delays. It rises 10 storeys, with six Corinthian columns and a flat-arched doorway. The trading floor was one of the largest rooms of its times—109 feet long, 140 feet wide and 72 feet high. The front of the building is one giant window, 96 feet long and 50 feet high. The Exchange was also one of the earliest buildings in New York to use air-conditioning. In 1978, the NYSE building was declared a National Historic Landmark