Main Tower is a 56-storey, 200 m skyscraper in the Innenstadt district of Frankfurt, Germany. It is named after the nearby Main river. The building is 240 m when its antenna spire is included. The tower has five underground floors and two public viewing platforms. It is the only skyscraper in Frankfurt with a public viewing observatory. It is the 4th tallest building in Frankfurt and the 4th tallest in Germany, tied with Tower 185.