In 1961 he sold his remaining properties at Herrenhausen Gardens, including the site of Herrenhausen Palace which had been destroyed by a British bombing raid in 1943. He kept however the "Princely House", a small palace built in 1720 by George I of Great Britain for his daughter Anna Louise. Ernest Augustus converted Marienburg Castle into a museum in 1954, after having moved to nearby Calenberg Demesne, which caused a row with his mother, who was forced to move out. He also sold the family's exile seat, "Cumberland Castle" at Gmunden, Austria, to the state of Upper Austria in 1979, but his family foundation based in Liechtenstein kept vast forests, a game park, a hunting lodge, "The Queen's Villa" and other property at Gmunden. The family property is now managed by his grandson Ernst August.