To be privately owned
Harkorten Manor

In the Hagen district of Westerbauer, Haus Harkorten, an almost completely preserved estate, was once the ancestral seat of the patrician and entrepreneurial Harkort family. The complex is a protected monument.
History+
The current manor house was built in 1756/57. Johann Caspar Harkort III commissioned the Schwelmer Meisterschule to construct a new manor house in the Bergisch Rococo style, inspired by Louisa Catharina Harkort. In addition to the manor house, the complex includes an economic building from the 17th century and a granary built in 1707.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=862
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: 51.3472, 7.4055