The Rathauspassagen behind Alexanderplatz became East Berlin's socialist showpiece in the 1970s. What was unique at the time was the combination of housing for over 900 people with social facilities and exclusive shops to promote a humanistic community. Straße Nummer Eins lets old, new, and former tenants tell their stories, searching for the ideal of community in a totalitarian system and its fate in German society after the end of the communist empire.