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Karl-Marx-Hof (English: Karl Marx Court) is a Gemeindebau (English: municipal housing complex) in Vienna, situated in Heiligenstadt, a neighbourhood of the 19th district of Vienna, Döbling.
At 1,100 metres (0.68 mi) in length and spanning four tram stops, Karl-Marx-Hof is one of the longest single residential buildings in the world.[citation needed]