The buildings of the Capuchin monastery, built in 1639-1650 on Strohgasse and dissolved in 1813, were home to the Linz (Pro-)Gymnasium, founded as early as 1706, from 1817 onwards. Until then, classes had been held in two rooms of the town hall. The monastery buildings were demolished except for the church in 1891 and a new school building was erected on the site in 1892/93, which was extended again in 1908. Badly damaged by bombing in 1945, the building was rebuilt in a modified form by 1950. In 1967, the grammar school moved to a new building in Bondorf. Today, the old school serves as the town's multi-purpose building. The former monastery and later grammar school church, a single-nave Baroque hall church with a choir and large round-arched windows, became the property of the town in 1971, was converted into a town hall and a modern extension was added. A Madonna on the crescent moon from the time the church was built is preserved in a niche above the portal.