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On 1 March 2007, the foundation stone was laid for a controversial project called Frankfurt Airrail Centre to be built on a slab over the station. Meanwhile, the nine-storey complex with more than eight hectares of office space, 550–700 hotel rooms, restaurants and shops, which had been built at a cost around €660 million,  was renamed the Squaire  (a portmanteau word derived from the English words "square" and "air"). The glass dome has been retained in the centre and on each side is the foyer of the hotel and the connection to the office wing. The opening was originally scheduled for autumn 2009,  but was delayed until early 2011. The complex will be completed in the spring of 2011.