Situated in coveted Huntington Harbour, this beautifully renovated Mid-Century Modern residence offers style, flexibility, and indoor-outdoor living. The tri-level plan features three bedrooms upstairs plus a private lower-level suite - currently a den/media room - that easily serves as a fourth bedroom, guest suite, office, gym, or second family room. It has its own full bath, heated floors, direct backyard access, and excellent separation from the main living areas. The home lives beautifully as a three-bedroom residence while offering the flexibility of a fourth bedroom whenever desired. The main level is bright and open, with 10-foot open-beam ceilings, floor-to-ceiling dual-pane windows, a wood-burning gas fireplace, and hardwood floors through the living and dining areas. The European-style kitchen overlooks the backyard and features heated tile floors, custom cabinetry, quartz counters, tiled backsplash, LED lighting, an Italian cooktop, Swedish double oven/microwave combo, and newer refrigerator. Large sliders open to a pergola-covered entertaining area with string lighting and a built-in BBQ island. The completely private backyard is a resort-style retreat with a rockscaped saltwater pool and spa, fire pit, lush palms, and multiple areas for dining and lounging. Upstairs, the spacious primary suite offers an oversized walk-in closet with custom California Closets built-ins and a spa-inspired bath with dual vanities and walk-in shower. Two additional bedrooms and a beautifully appointed guest bath complete the level. Upgrades include a fully paid-off 12.68 kW Tesla solar system, whole-house water softening, dedicated kitchen water filtration, app-controlled Ecobee smart thermostat, Ring security system, and a dedicated laundry room. The finished two-car garage adds custom cabinetry, utility sink, refrigerator, and a wall-mounted Level 2 EV charger compatible with Tesla and other vehicles. Within walking distance of the beach, Baby Beach, parks, dining, and shopping, this Huntington Harbour home pairs sophisticated Mid-Century Modern design with an unusually versatile floor plan and a private resort-style backyard. No HOA fees.