Macadam was able to secure funding to expand the physical plant of the Institute by acquiring the freeholds of 6 Duke of York Street, then called York Street, (largely through the generosity of Waldorf Astor, John Power and others) and later 9 St James's Square, then the Portland Club, in 1943 (through a donation to cover its purchase by Henry Price), and connect these adjoining properties to the original freehold property of Chatham House at 10, St James Square (with the cost of these connections covered by Astor's sons, William, David and John). Power also donated his leasehold property in Chesham Place to the Institute in 1938. These additional properties provided much needed additional space for the Institute's activities.