The Aetna Building is a 309 feet (94 metres), 22-floor highrise building in downtown Jacksonville, Florida. It is also known as Prudential Plaza I or One Prudential Plaza, and formerly as the Prudential Building. It is named for Aetna, which has presence in the building. Completed in 1955, it was the tallest building in the city for 13 years until surpassed by the Riverplace Tower. It was "The Tallest Office Building in the South" and the tallest in Florida until NASA's Vehicle Assembly Building was completed in 1965.