This steel tower replaced Ernest Flagg's former Singer Building and City Investing Building.Designed in the International Style and completed in 1973. It is 743 ft (226 m) tall and has 54 floors. At 2.3 million sq ft, each floor offers almost 1 acre of office space, making it one of the largest office buildings in New York by usable interior space. Its facade is black, consisting of a structural steel frame. South of the building is Zuccotti Park, formerly called Liberty Plaza Park. One Liberty Plaza was originally commissioned by U.S. Steel, and also housed the headquarters of Merrill Lynch. As of 2016, it was the 656th tallest building in the world.