Its connected to the latter via an underground tunnel.
The sinister-looking building was designed by the husband-and-wife duo of Gerd and Magdalena Hanska.
The German Architecture Museum in Frankfurt once called Mausebunker the most sinister building of German post-war modernism.
Photo:Gunnar Klack/Wikimedia Commons
The building was closed in 2010, and since then has been lying vacant.
The building will now be reviewed to explore reuse options.
