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The heritage protected "Dortmunder U" is a former industrial building of the no more existing "Dortmunder Union" brewery. As the first high-rise building in Dortmund, it was opened in 1927. On the roof is a four-fold since 1968, lit "U", which is nine meters high. The building itself is now on two floors, the 'Musuem Ostwall' for modern and contemporary art.