By car:

Public parking can be found at Sohnstrasse across the street.

By public transportation:

From Düsseldorf main train station (bus stop and tram stop are in front of the main entrance to the main train station)
– tram: line 709 to tram stop Engerstrasse
– bus: line 834 to bus stop Engerstrasse

The entrance A is in the back of the two buildings. You find entrance A passing the BMW car dealer and the barrier.
Entrance A is at the right side from the parking ramp.