Since the 18th century, they've enjoyed the luxury of a first-class country palace reminiscent of Versailles.
The palace was built in the 13th century and destroyed utterly in the 16th century. 
mnli hypothesis: The palace was built in the 13th century and destroyed utterly in the 16th century.  premise: Since the 18th century, they've enjoyed the luxury of a first-class country palace reminiscent of Versailles.