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The skyline of Des Moines changed during the 1970s and 1980s as several new skyscrapers were built. Before then, the 19-story Equitable Building, from 1924, was the tallest building in the city and the tallest building in Iowa. The 25-story Financial Center was completed in 1973 and the 36-story Ruan Center was completed in 1974. They were later joined by the 33-story Des Moines Marriott Hotel (1981), the 25-story HUB Tower and 25-story Plaza Building (1985), Iowa's tallest building, Principal Financial Group's 45-story tower at 801 Grand (1991), and the 19-story EMC Insurance Building (1997).