621 17th Street

621 17th Street, formerly known as the First Interstate Tower South, is a high-rise building in Denver, Colorado, United States. The building was completed in 1957, and rises 28 floors and 385 feet (117 m) in height. The building stands as the 20th-tallest building in Denver and Colorado. It also stood as the tallest building in the city at the time of its 1957 completion, and held that distinction for eleven years until it was surpassed by the 420-foot (128 m) Brooks Towers in 1968. 621 17th Street is considered to be one of the earliest modern skyscrapers in Denver.