 Around 1840, John Bligh Monck made some changes to Coley House, including a new staircase and, probably, adding the third floor that is now to be seen.The Monck family would continue to own the estate until 1937, when it was sold to John Bucknell.The Bucknells continued to own the site until the mid-1950s when the estate was sold to a number of purchasers.