An insurance survey of 1950 listed the farm as having two tenant houses, the main house, a privy, chicken house, pump house, machinery shed and workshop, dairy barn and house, calf house, granary, corn crib, house barn, a second machinery and hay shop, a cow shed, and a hog shed. By 1953, the Willcoxon heirs had begun to sell off large parcels of the farm for development, and soon the original landholdings around Blenheim were reduced to twelve acres. Before her death in 1959 Marguerite (Daisy) had given the estate to her daughter, Barbara Duras, who moved into the house with her husband, William in 1962. Barbara died in 1987, followed by William in 1997. The City of Fairfax purchased the site in January 1999. The family cemetery, located next to the house, includes four generations of the Willcoxon family. Today  The Willcoxon family and their descendants never covered the inscriptions in the attic of their home. The attic space was probably used mostly for storage after the war. Many layers of wallpaper were added to the first and second levels of the home through the twentieth century, but the drawings on the walls were never destroyed. Today, the wallpaper on the two main floors has been removed and the inscriptions are visible throughout.
Before her death in 1959 Marguerite (Daisy) had given the estate to her child, Barbara Duras, who moved into the house with their husband, William in 1962.