By 1892 it had run out of space and moved into the Poseck’sche Haus, now the Museum for the Prehistory and Early History of Thuringia, also set up by the society.

It also runs the German Bee Museum[2] and since 2006 the Kunsthalle "Harry Graf Kessler" at Goetheplatz 9b.

In the second phase the Weimar architect Johann Christian Heinrich Schlüter designed and built the middle range.

[4] In a letter to his friend Christian Gottfried Körner, Friedrich Schiller called the building the most beautiful one in the whole of Weimar,[5] as well as giving a detailled description of it, the garden behind it and its usage.

[6][7] Behind it were workshops forming a four-sided courtyard, used by figures such as Christiane Vulpius and demolished to built the Weimarhalle in 1928.