When
Deutsche Bahn announced plans to build a fast rail link between
Cologne and Frankfurt (
Cologne–Frankfurt high-speed rail line), it planned for a second train station at Frankfurt Airport, because it was clear that the existing train station would not be able to handle the predicted traffic. Construction work for a new train station close to the airport grounds started in 1995 and was finished in 1999. With a glass dome on top, it was designed to allow the later construction of an office building. In November 2006, preparatory construction work on the office building started based on a design by the Frankfurt based architecture firm
JSK. The main investor of the project is the
IVG Immobilien AG in Bonn. In 2006, after plans were delayed several years due to lack of potential tenants, the construction of the building, then called
Airrail Center Frankfurt, began with an announced opening day in 2010. The foundation stone was laid on 1 March 2007. Planned construction costs were 660 million
Euro. Trouble with the construction company and the use of bad construction steel imported from China, which had to be replaced, pushed the costs up to 1 billion Euro. In June 2010, the name was changed to
The Squaire. From April to December 2011, the move-in of the main tenants took place in sections. == Tenants ==