The Chair for Compiler Construction just moved to the new cfaed building. The group of Prof. Castrillon left the old address at Georg-Schumann-Str. 7A and is now to be found at 

Building Barkhausenbau 
Helmholtzstrasse 18
3rd floor, rooms BAR III50 – III82
01069 Dresden
Germany

Look at the contact page for detailed directions.