The Rancho Potrero Open Space area is located in Newbury Park off of Lynn Road, just east of the intersection with Rancho Dos Vientos. The area includes an equestrian center where Rocking K Horse Rentals is located and is adjacent to the Rancho Sierra Vista/Satwiwa area in the Santa Monica Mountains National Recreation Area.
On the west end of the space is a a property that used to be called Olympia Farms, which was owned by Greek immigrant, textile businessman and Arabian horse breeder George Patarias Huck. (Huck was tragically shot and killed in front of his home in Mt. Olympus in August 1984 at age 46.)
Huck's 640 property was sold to the Mountains Recreation and Conservancy, City of Thousand Oaks, Conejo Recreation and Park District and National Park Service for $4.2 million in 1993. 312 acres were carved out as an addition to Rancho Sierra Vista. The remainder is part of Rancho Potrero, which is maintained by the Conejo Open Space Conservation Agency (COSCA).
You can explore the Olympia Farms area when hiking in the area, to find large piles of old ranch buildings.
These old ranch buildings are actually a Ventura County historical point of interest that was designated as such in May 1986. According to the City of Thousand Oaks, there were two large barns built in 1930 on the Dos Vientos Ranch. Joseph Lewis, business partner of City of Camarillo namesake Adolfo Camarillo, farmed 8,000 acres of land in this area. The barns were dismantled to make room for home development in Dos Vientos and the lumber currently resides here. The Conejo Recreation & Park District is working with the Conejo Valley Historical Society in finding other appropriate uses for these materials, such as displays at the Stagecoach Inn Museum in Newbury Park.