It was started in 1769 .
It was finished in 1771 on a plot between another Adam house to the west , and the garden wall of Foley House to the east , on land which was part of the Duke of Portland 's estate .
It was started in 1769 and finished in 1771 on a plot between another Adam house to the west , and the garden wall of Foley House to the east , on land which was part of the Duke of Portland 's estate .