Maintower is a 200 metre (656 foot) skyscraper in Frankfurt am Main, Germany. It is named after the river Main. A 40 metre (131 foot) communications tower is mounted atop the building. It features five underground floors, as well as two public viewing platforms. The tower currently remains the only skyscraper in Frankfurt with a public viewing observatory. It is currently the 4th tallest building in Frankfurt.
Maintower was built between 1996 and 1999 and contains the Landesbank of Hesse and Thuringia (Helaba), the German Office of Merrill Lynch and a television studio of the Hessischer Rundfunk, among other enterprises. The first tenants moved in on 5 November 1999, and the official inauguration was 28 January 2000. During weather reports by the television station, the weather reporter stands on the top of the building.