The land was subsequently divided by an allied commission and the League of Nations, leaving the Katowice region on the Polish side.

Designed by architect Ludwik Wojtyczko [Wikidata], the Silesian Parliament was built in 1925–1929 in the Stripped Classicist style.

The Polish architect Adolf Szysko-Bohusz announced a competition for the design of the new Silesian Parliament in 1925, who wished the building to espouse the local Polish cultural identity of the region, instead of the more customary German/ Prussian style.

When the building was inaugurated in May 1929, Michal Grazynski, President of the Province of Upper silesia, called the building a "material symbol of Polish culture and power".

[2] The building is one of Poland's official national Historic Monuments (Pomnik historii), as designated on October 22, 2012 and tracked by the National Heritage Board of Poland.