The Green House is mentioned in records from as early as the 15th century as a venue for County Parliament and Municipal Council meetings. It has seen many events and uses. Originally it was an inn selling wine, in the 17th century the trials of anti-Habsburg conspirators were held here.
Later, in the 18th century, the rear of the building was rebuilt as a theatre where the town's citizens saw plays by Moliere and Shakespeare for the first time.
Actors also performed in the Green house for Empress Maria Theresa and her family. The house became a local landmark because of its painted green facade and rooms. The building was decorated with green ornaments of plants and figures, a style which was in vogue during the late Gothic period.
On the top cornice is a Biblical stone relief showing Joshua and Caleb carrying bunches of grapes from Canaan.