The 1901 neobaroque Neuer Marstall by Ernst von Ihne once sheltered royal horses and carriages. In 1918 revolutionaries hatched plans to topple the Prussian monarchy here; a GDR-era bronze relief on the (north) facade facing Schlossplatz shows Karl Liebknecht proclaiming a German socialist republic from the Berlin City Palace that same year. The building now hosts concerts of the Hochschule für Musik Hanns Eisler, a prestigious music academy.