To be privately owned
Meseberg Castle

Meseberg Palace, a Baroque palace in Brandenburg, serves as the guesthouse for the German federal government. It is situated on Lake Huwenow.
History+
After the original manor house in Meseberg was destroyed by fire in March 1721, Count Hermann von Wartensleben began constructing the current palace in 1736. The estate came into the family's possession through his marriage in 1723, having belonged to the von der Groeben family since the second half of the 16th century. Construction of the house began in 1737 and was completed in 1739. The architect remains unknown but is believed to be associated with Philipp Gerlach, Berlin's chief building director. The terraced Baroque garden was designed by an artist named Münther. After Wartensleben's death, Prince Henry of Prussia acquired the estate in 1774 and gifted it in 1775 to his favorite, Christian Ludwig von Kaphengst, who expanded the complex with additional buildings such as the stables. Later, the palace came into the possession of Carl Robert Lessing, who purchased it for his son Gotthold Ephraim Lessing the Younger.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 52.9725, 13.1013