into the eight-story National City Bank Building. 14 Wall Street, a 32-story skyscraper with a 7-story stepped pyramid, built in 1910–1912 with an expansion in 1931–1933. It was originally the Bankers Trust Company Building. 23 Wall Street, a four-story headquarters built in 1914, was known as the "House of Morgan" and served for decades as the J.P. Morgan & Co. bank's headquarters and, by some accounts, was considered an important address in American finance. Cosmetic damage from the 1920 Wall Street bombing is still visible on the Wall Street side of this building. 48 Wall Street, a 32-story skyscraper built in 1927–1929 as the Bank of New York & Trust Company Building. 40 Wall Street, a 71-story skyscraper built in 1929–1930 as the Bank of Manhattan Company Building; it later became the Trump Building. 1 Wall Street, a 50-story skyscraper built in 1929–1931 with an expansion in 1963–1965. It was previously known as the Irving Trust Company Building and the Bank of New York Building. 75 Wall Street, built in 1987. It was built to be the U.S. headquarters of Barclays although several firms leased space in the building after it opened. It was converted in 2006–2009 into a mixed-use building with condominiums and a hotel. 60 Wall Street, built in 1988. It was formerly the J.P. Morgan & Co. headquarters before becoming the U.S. headquarters of Deutsche Bank. It is the last remaining major investment bank headquarters on Wall Street. Another key anchor for the area is the New York Stock Exchange Building at the corner of Broad Street. It houses the New York Stock Exchange, which is by far the world's largest stock exchange per market capitalization of its listed companies, at US$28.5 trillion as of June 30, 2018. City authorities realize its importance, and believed that it has "outgrown its neoclassical temple at the corner of Wall and Broad streets", and in 1998, offered substantial tax incentives to try to keep it in the Financial District. Plans to rebuild it were delayed by the September 11 attacks. The exchange still occupies the same site. The exchange is the locus for a large amount of technology and data. For example, to accommodate the three thousand people who work directly on the exchange floor requires 3,500 kilowatts of electricity, along with 8,000 phone circuits on the trading floor alone, and of fiber-optic cable below ground. Importance As an economic