Welcome to 12346 Split Rein Drive, a beautifully upgraded home located in the highly sought-after Etiwanda area of Rancho Cucamonga. This well-maintained residence offers a perfect blend of comfort, functionality, and resort-style outdoor living. Inside, the home features a combination of tile flooring and carpet, complemented by fresh interior paint throughout. The kitchen is highlighted by granite countertops and flows effortlessly into the main living spaces. A whole-house fan enhances energy efficiency and comfort. Recent upgrades include two new AC units, a furnace, and thermostats installed in 2025, as well as all-new solar panels and an electrical box completed in 2024. MAIN floor bedroom and full bathroom. Large laundry room with storage! The expansive primary bedroom is a true retreat, offering exceptional space and versatility. Designed with comfort in mind, it features a large ensuite bathroom and ample room for a sitting area, home office, or workout space. The layout allows the primary suite to be easily converted into a fifth bedroom by adding a closet and door, providing flexible living options to suit a variety of needs. RV parking accommodates up to a 28-foot trailer, offering excellent flexibility for recreational vehicles. Step outside to a spectacular backyard designed for both relaxation and entertainment. Enjoy a fully remodeled pool with new Pebble Tec finish (2024), updated pool equipment, lighting, and app-controlled system. A dramatic rock formation with a slide adds a resort-like feel, while a dedicated golf putting area enhances the outdoor experience. The backyard also features a barbecue island complete with built-in BBQ and refrigerator. Conveniently located near top-rated schools, parks, shopping, dining, and freeway access, this home offers an exceptional opportunity to enjoy the best of Rancho Cucamonga living.