Tettnang Castle, also known as the Tettnang New Palace, is one of three castles in the German town of Tettnang. The other ones are Tettnang Old Palace and Torschloss close to Bärenplatz.
Tettnang Castle is owned by Staatliche Schlösser und Gärten Baden-Württemberg.
Wikipedia https://en.wikipedia.org/wiki/Tettnang_Castle
Coordinates 47°40'11.519" N 9°35'5.443" E