A Blackhawk estate on a prominent .51-acre corner lot offers an exceptional two-level floorplan, ultra-private backyard sanctuary bordering open space, and proximity to the acclaimed Lakeside championship golf course and clubhouse, all within the gated and prestigious East Bay country club. 5819+/-SF of thoughtfully-designed living space with a grand double-door entry. Soaring ceilings. Polished oak hardwood floors. New plush carpet. A contemporary palette of fresh wall paint. New stylish light fixtures. Recessed lights. Fresh exterior paint. Energy-cost saving pool solar. Sweeping staircase. 5 bedrooms. 4.5 bathrooms include a main-level primary suite and guest suite with a walk-in closet and an all-new en-suite with tile flooring, vanity, and shower.  Elegant formal living room with a gas fireplace, crown molding, and front-facing bay window. Formal dining room, slider to private patio. A chef's eat-in kitchen. Tile counters/backsplashes. Island. Peninsula island/breakfast bar. Garden window. GE dual ovens and dishwasher. Jenn-Air cooktop. Casual dining area. Wine-Cellar. Expansive family room. Vaulted ceiling. Gas fireplace, stone surround. Walk-around wet bar. Backyard access. Executive office behind glass French doors. Oak paneling, built-ins. Bonus room with vaulted ceiling, wet bar, private balcony, and en-suite. 2 upstairs bedrooms feature walk-in closets, built-in window seats, and share a Jack-and-Jill bathroom. Primary suite with a dual-sided gas fireplace. Large walk-in closet with two entries plus a secured reach-in closet. Coffered ceiling, crown molding, and a glass slider to the backyard. En-suite with dual vanities, jetted tub, shower, updated fixtures. Backyard borders open space. Patio. Pool and spa. Mature shade trees, redwoods. Lush foliage, garden beds, lawn. The level yard offers space for potential additions such as a pool house, cabana, outdoor kitchen, and play structure. Additional features: Updated dual HVAC, two two-car garages with finished walls. Large laundry room with quartz counters, cabinetry, and a stainless-steel sink. A main-level powder room. A large storage room off the upstairs bonus room. Near 2 par-72 golf courses, tennis/pickleball courts, Fitness and Wellness Center, and Sports Complex. Nearby top-rated SRVUSD schools, Mt. Diablo, downtown, freeways, equestrian centers, and Livermore Valley Wine Country.