Welcome to Mariposa at Santiago Estates, one of Temecula's premier luxury estate communities offering an exceptional blend of sophistication, privacy, and lifestyle with no HOA and low taxes. Tucked away on a peaceful cul-de-sac, this expansive 4,533 sq. ft. estate sits on 2.4 fully usable acres and captures panoramic sunset views and annual fireworks displays, creating a truly elevated living experience. Designed for both grand entertaining and everyday comfort, this stunning residence features 5 bedrooms and 4.5 bathrooms, including a highly desirable Next-Gen/In-Law suite with private entry and its own living area ideal for multigenerational living, guests, or flexible use. At the heart of the home, the chef's kitchen has been beautifully upgraded with granite countertops, a large prep island, designer lighting, and premium appliances, flowing seamlessly into the formal living and dining rooms and an expansive family room complete with fireplace and built-in bar, perfect for hosting and entertaining. The luxurious primary suite offers a private retreat with a sitting area, fireplace, and spa-inspired bath featuring dual sinks, quartz countertops, soaking tub, and walk-in shower. A versatile bonus flex room provides endless possibilities for a home gym, office, or creative studio. Step outside to your resort-style backyard oasis, where a saltwater pool (installed just over 5 years ago) is enhanced by new pool equipment and filter system (2026) and solar heating. Entertain effortlessly under the Alumawood patio cover, enjoy the built-in BBQ outdoor kitchen and dining area, or relax around the fire pit lounge. The grounds are thoughtfully designed for both leisure and sustainability, featuring mature fruit trees including oranges, lemons, limes, figs, avocados, olives, pomegranate, and grapevine, along with raised garden beds for farm-to-table living. A detached pool room/office adds additional flexibility for work or recreation. For equestrian enthusiasts or those seeking additional development potential, the lower portion of the property includes a horse barn and riding arena, offering true horse property amenities and potential for ADU conversion. This home has been extensively upgraded with major systems already completed, including: 56-panel paid-off solar system, 400-amp electrical service, Whole-house water filtration system, New HVAC system, Roof replaced in 2022, New luxury vinyl plank (LVP) flooring, New water heater, Septic tank and leach lines installed in 2024 and New insulation. Additional features include a 3-car garage and extended RV parking driveway, providing ample space for vehicles, toys, and storage. Ideally located just minutes from Old Town Temecula, Temecula Valley Wine Country, and Pechanga Resort Casino, as well as top-rated dining, shopping, and entertainment, this property delivers the ultimate Southern California lifestyle. A rare combination of luxury, land, upgrades, and location, this estate truly checks every box.