Manni at the customs control 

Location: Junction of Westhafenstrasse and Beusselstrasse

There is only one distinctive building within this scene and that’s the ‘Air Traffic Control Observation’ lookout structure in the background. Having searched Berlin’s Air Traffic Control towers, I ruled out this location as an possible airport.

Westerhafenstrasse leads down to the dock area. The guard’s building and road barrier looked real enough, so, this location would had been a secured entry to the docks, though, I suspect the non-German sign in this scene was a prop for the film. No idea when the building and barrier were demolished. 

Big thank you and credit goes to Gisburn for letting me know this location, thank you.