The Cardozas made further improvements to the ranch containing Tolay Lake and retained ownership until 2005. During the Cardoza tenure, numerous road and fence additions were made as well as well crafted dry stone bridge and wall structures; these changes were introduced to facilitate the cattle grazing, pumpkin farming and other farming uses. In 2005 the Board of Supervisors of Sonoma County entered into an option purchase agreement of the entire property for somewhat below the appraised land value. The Cardozas retain ownership to the considerable collection of charmstones found prior to the date of this contract.