Attention: Due to roadworks in front of the office building please do not use the way from Ostkreuz because this will not work. There is no way to the testing center. You need to come from Warschauer Strasse.  (see below)

This is the official information for all the buildings at the site. We are in Haus 16:

Please mind the following situation:
old way

  Here is how to reach us:
  Transportation to the testing center is best by train.
  Exit S-Bahn or U-Bahn at Warschauer Strasse. Should you arrive with S-Bahn please go to U-Bahn station.
Use U-Bahn exit to Rudolfstrasse.
When you get down the stairs you will find yourself at the start of Rudolfstrasse.

Follow Rudolfstrasse (about 550 m) till you reach Modersohnstrasse.
At Modersonstrasse turn left ...

and follow it for 50 m and then turn right into a street Markgrafendamm - but there is no street sign for it.

This is what you see when you turn into the street.

Follow it for another 100 m and turn right again.

You are almost there:
After 222 m ...

... you will find Haus 16 - you need to pass Haus 18.

Enter Hause 16, climb up to level 3 where you will find the test center at Room 301.
Thanks that you are here.

Here the entire route in one picture ...
... and what google says: