The residences at Bilker Straße 7 and 9 have both rich history (including ownership by Prince von Sayn-Wittgenstein, which gave them the name), and are owned by the municipality. They were reconstructed in the 1970s with their historic façades preserved, but the interior was redeveloped to house cultural institutions. Today it is the home to the Marionetten-Theater, a chamber music hall and the Institut Francais