To be privately owned
Weil Castle

The listed building, in the classical style of Italian country houses, is currently owned by a company that wishes to remain anonymous. In the years 1819 and 1820, the magnificent building was constructed by the Württemberg court architect Giovanni Salucci on behalf of King Wilhelm I. The monarch used the small palace as a country residence near his stud farm, where proud Arabians and English half-breeds were once bred. In the 1890s, the noble horses were allowed to demonstrate their skills at the then-famous Weiler horse racing track. In addition, the monarch operated a silkworm farm on the area, which was once used for agriculture.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Esslingen_am_Neckar_Weil_Koeniglicher_Pavillon.jpg
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: 48.7388, 9.2730