sentences:  Una's grandson, former Hawaii Attorney General Michael A. Lilly and his wife Cindy Walter were the last members of the Walker family to live on the estate.In 1989, two years after Una's death, the house and its grounds were sold by the Walker heirs to Masao Nangaku of Minami Group (USA) Inc. for $8.5 million.His intention was to restore the original house to be used as a corporate retreat.