text: I have been there once. There is a larger administrative building that hosts a number of public services. One of them is the data protection authority for Berlin. They have one or two floors as far as I remember:
  
  Berliner Beauftragte für Datenschutz und Informationsfreiheit
  Friedrichstr. 219
  Besuchereingang: Puttkamerstr. 16 – 18 (5. Etage)
  10969 Berlin
  
  source: https://www.datenschutz-berlin.de/ueber-uns/kontakt/