Maybe it is only a connection from building to another building to enlarge it, because there were not enough space for the whole building concept? I never saw this building in Berlin. ^^ Can you say where it is? I don´t think it is an hospital, or an old corridor between west and east berlin to smuggle food and cigarettes.
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funny but the answer is not correct. I found this while walking to the gleisdreickpark. its a new park in berlin