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Go downstairs at Düsseldorf main station and use subway U79 (stops at track No. 2) towards "Universität Ost/Botanischer Garten". Get off at the terminal stop "Universität Ost/Botanischer Garten" (~10 minutes). Walk about 200m, we are in the first building (26.13, it has a greenhouse on the roof) on level 01.
Approaching Düsseldorf on the Autobahn A46 from Wuppertal, take exit 24 "D-Universität", after 500 metres turn left into Universitätsstrasse, follow Universitätsstrasse for ~1 km, park at P1 or P2 (on your left). Walk the last 400 m to building 26.13. We are on level 01.
If coming from the A57 (Neuss), take exit 23 "D-Bilk" (just after crossing the Rhine), turn right towards "Universität", and follow the signs towards "Universität", park at P1 or P2 (on your right), and walk the last 400 m to building 26.13. We are on level 01.
Take a taxi to Universität/Christophstrasse. Get off at the end of Christophstrasse (dead end). Pass the red and white barrier. We are in building 26.13 on your left.