There is a 900-acre piece of land up above El Granada Blvd that is currently available. The views are amazing - from Mt. Diablo to the East to San Francisco to the North to Pigeon point to the South down the coast. The land borders the State Wildlife Refuge area that surrounds Crystal Springs reservoir. Wow! I'm glad to get you more details if this is the one you were thinking of.
Are you referring to the many acre 'estate' that was on the market about 5 years ago... If I recall correctly it had an interesting home that originated from a mobile home on it and a significant amount of acerage. If you are interested - I could find out. Please let me know.