Castle Dounie was replaced by a small square building costing £300 in which the Royal Commissioner resided until 1774, when some of the forfeited Lovat estates were granted by an Act of Parliament to his son, Simon Fraser, Master of Lovat (1726–1782), by then a major general, in recognition of his military service to the Crown and the payment of some £20,000. Later, two modest wings were added. On the death of General Fraser's younger half-brother, Colonel Archibald Campbell Fraser of Lovat (1736–1815), without legitimate surviving male issue, the Lovat estates were transferred, by entail, to Thomas Alexander Fraser of Strichen (1802–1875), a distant cousin who was descended from Thomas Fraser of Knockie & Strichen (1548–1612), second son of Alexander Fraser, 4th Lord Lovat (1527–1557). Knockie was sold about 1727 to Hugh Fraser of Balnain (1702–1735).