In early December 1918, the building housed the District Assembly, i.e. a Parliament representing the Polish residents of Prussian-owned land. At the time, it was still uncertain whether Wielkopolska would end up in a Polish or German state. The members of parliament were elected by modern democratic rules. For the first time in Polish history, the right to vote for MPs was extended to women. Although the chamber only deliberated for 3 days, it succeeded in issuing a call to incorporate Prussian-partitioned land into a newly-restored Poland.