Johnstone Castle

Built in 1560, the castle has been owned by the Houston Lairds of Johnstone, the Cochrane Earls of Dundonald and the Archbishop of Glasgow.
In 1848 Chopin, the composer, was invited to stay by Laird Ludovic while he performed at Glasgow’s Merchant Hall.
More details on the castle here
Now a private home. 
Category B listed building.
Some more views and information here