After Henderson died on November 16, 1983, the Colorado mountain property, including the underground home, was put up for sale for $1.5 million dollars. It was purchased for $1.17 million by the Sacred Mountain Ashram on June 9, 1988 from a mysterious reclusive millionaire who was "terrified...of being caught in a nuclear holocaust." After the sale, the exterior walls of the underground house were dug free of dirt, windows were built to allow sunlight to come into the home.