Built in 1747-1752, the Osteiner Hof (Court of Ostein) is one of several Baroque-era palatial mansions along Schillerplatz (Schiller Square).
It was built by architect-soldier Johann Valentin Thomann for Franz Wolfgang Damian von Ostein, brother of prince-bishop of Mainz Johann Friedrich Karl von Ostein.
Like most of the historical architecture, Osteiner Hof went through numerous changes over centuries and now it's a service apartments building.
The Osteiner Hof plays an important part in the local carnival traditions. Every year, on 11/11 at 11:11, the start of the carnival season is proclaimed from the balcony of the mansion.