The library resides in the glass building next to the tower building (Geomatikum).
Take the U2 / U3 to the stop "Schlump" and than walk to the Bundesstraße
Stop "Bundesstraße", e.g. with line 4
S-Bahn until stop "Sternschanze", change and take the subway U3 to "Schlump" (1 Station) and walk / take the bus