also dedicated to the development of the company Klepper, who was once the biggest employer in Rosenheim. Architecture The Mittertor (the sole survivor of five market gates) was the eastern gate of the market town before 1350, which was then protected with a double ditch. Since the 15th century, it separated the interior from the exterior of the market town and served as a customs office. Until the 19th century it also contained several municipal facilities such as the city clerk's office. After the great fire in 1641 the Rosenheim onion dome was built and later extended into a long building. At its core is the Mittertor, the oldest building in the city. On the façade facing the square is the emblem of Louis Rosenheim, with the white rose against a red background. The Bavarian crest can also be seen here. The street Münchener Strasse follows the Gillitzerblock, that is also called "small pedestrian zone." Immediately apparent are the magnificently restored Gründerzeit fronts. The name Gillitzerblock come from its builder Thomas Gillitzer. At the end of the 19th century he obtained a relatively large area of land for its day, and built 15 houses, including the Hotel Deutscher Kaiser. Since the 1960s, the once solely Gründerzeit ensemble has been altered with new construction and renovations. Only the façades in Münchener Strasse have been preserved and restored to the original. The Quest- was built from 1855 to 1916 in several phases as industrial complexes. Kunstmühle was at these times the name for technically advanced mills which were generally not powered by water or wind – German Kunst meaning art, therefore implying artificially powered in English (Steam, Diesel, etc.). The mill was renovated in the 1990s and now serves as a restaurant and office space. The Quest-Kunstmühle Power station is located on the Mangfallkanal. The former mill houses the exhibition halls of the Rosenheim arts club. The approximately upper floor holds exhibitions of contemporary artists, exchange exhibitions with other art associations and activities accompanying the exhibition. The Rosenheim ballroom was built in the former Rosenheim Hofbräus buildings. The hall with ballroom and vaulted cellar was built in 1878. It was renovated in 1994 and since 2001 has been used as an event space, with its many possible uses of the centre of the eastern city of Rosenheim. The city's landmark is the gothic spire () of the parish church St. Nikolaus ()