To be privately owned
Rommeljans Manor

Haus Rommeljans in Ratingen-Schwarzbach is a manor and estate house that once served as a fortified knight's seat. Its history dates back to the early 16th century.
History+
Haus Rommeljans was first documented in 1517 in a register of income for the Ratingen sacristy. Between 1551 and 1555, the Lords of Buer transformed it into a fortified knight's seat, taking the form of a moated castle with a tower. In 1555, Haus Rommeljans was officially registered as a knight's seat and subsequently managed as a manorial estate eligible to attend the regional assembly. The Buer family owned the property until 1758. It then passed to the Staël von Holstein family (1758-1763), followed by the Lauterbach (1763-1784) and Spieker (1784-1823) families.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=583
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: 51.2917, 6.8854