Welcome to this exceptional Arlington Heights estate in Riverside, offering a rare combination of space, versatility, and resort-style living. Perfectly suited for multi-generational living, this property features a beautifully appointed main residence along with a fully equipped detached casita. Designed for both comfort and functionality, the main home features two fireplaces, a spacious living room, family room, formal dining room, and a charming breakfast nook. The main level includes a junior suite with its own private ¾ bath, as well as an additional full bathroom for guests. Upstairs, the primary suite offers a luxurious bath complete with both a soaking tub and separate shower. Dual A/C units for upstairs and downstairs ensure year-round comfort. Additional highlights include plantation wood shutters, a spacious laundry area with abundant storage (ideal as a super pantry), and shade awnings that help reduce energy costs. A true standout feature, the casita is fully equipped with a suite of appliances including a refrigerator, dual sink, microwave, induction range, and ample cabinetry. It offers generous closet/storage space, a stacked washer and dryer, and a private full bathroom with a custom shower and vanity. Enjoy your own covered patio with ceiling fan, a cozy gas fire pit, and a second-floor vantage point with views of the cul-de-sac-perfect for guests, extended family, or rental potential. The expansive backyard is an entertainer's dream with a lush rolling grass lawn, decorative rock accents, and a large concrete slab ready for sports or recreation. The main house patio features a covered structure with two ceiling fans, a built-in BBQ island with gas flat grill, bar area, refrigerator, under-counter storage, and a festive tiki-style palapa with party lighting. Enjoy your private pool and spa complete with a heater, side suction port for easy maintenance, and a programmable pump designed for energy efficiency and optimal water quality. A separate covered poolside patio with ceiling fan provides the perfect place to relax. Additional features include a Tuff Shed on its own concrete pad for extra storage, a spacious front driveway, and a side driveway with RV potential. This is a rare opportunity to own a truly versatile and amenity-rich property in one of Riverside's most sought-after neighborhoods!