Windermere Diablo Realty Windermere Diablo Realty Share: Real Estate - Residential Windermere Diablo Realty Visit Website Request Info 975 Ygnacio Valley Rd. Walnut Creek, CA 94596 (925) 933-9300 (925) 906-1434 (fax) About Map About Like Mt. Diablo rises from the earth...Diablo Realty rises up above the competition to provide a higher standard of real estate excellence. What's Nearby? Distance: 5 10 15 20 25 50 mi.