That's at Potsdamer Platz. That area was basically No Man's Land during the Cold War and was completely rebuilt after the end of that. It's mostly a mix of commercial space (there's 2 malls and 2 big movie theaters in the vicinity), office buildings, tourist landmarks (the Holocaust Memorial, Brandenburg Gate and Reichstag are nearby) and government buildings.
There's some restaurants in the area, mostly sit down though outside the mall food courts and the food stalls in the S-Bahn and U-Bahn stations. But I don't know where the closest "typical" Berlin late night food place would be. On memory I'd say in Wilhelmstrasse which is a 5 minute walk or so.