The Prudential Tower, also known as the Prudential Building or, colloquially, The Pru, is an International Style skyscraper in Boston, Massachusetts. The building, a part of the Prudential Center complex, currently stands as the 2nd-tallest building in Boston, behind the John Hancock Tower. The Prudential Tower was designed by Charles Luckman and Associates for Prudential Insurance. Completed in 1964, the building is 749 feet (228 m) tall, with 52 floors. It contains 1,200,000 sq ft (110,000 m²) of commercial and retail space. Including its radio mast, the tower stands as the tallest building in Boston and is tied with others as the 77th-tallest in the United States, rising to 907 feet (276 m) in height.