Beautiful single level custom home and detached rooms totaling approximately 3,742 square feet with 5 bedrooms plus home office/gym and 4 bathrooms. The main home (3,262sf) has 4 bedrooms, 3 bathrooms plus the home office and a bonus office alcove. Gorgeous Chef's Kitchen with granite counter tops and huge center island. Many additional features including arched passageways, coffered ceilings, abundant natural light, two gas fireplaces, two HVAC systems, 3-car garage. Newer detached 1 bedroom, 1 bathroom (480 sf) plus workshop. Great for au-pair, in-laws, pool house/outdoor restroom, teenager hang-out. Sparkling pool, waterfall, spa gazebo and spacious entertainment area. Private gated Stonecastle Estates - it's amazing how quiet it is compared to other nearby neighborhoods that are farther away from 680 and/or are at higher elevations. Easy stroll/bike ride along the Ironhorse path to either quaint Alamo or the renowned downtown of Walnut Creek.