The three-story solid stone building with a half-timbered upper floor, stone gables, and a high gable roof dates back to the 14th century. On the south side, there is a protruding octagonal stair tower with a coat-of-arms adorned portal. From 1527 to 1606, it served as the Markhof of the Lords of Nassau-Sporkenburg; since 1998, it has housed the Municipal Stage of Lahnstein, which quickly became a cultural center of the region. In the theater foyer, there are annually changing exhibitions of local and regional artists.

- accessible toilet available -