Set on over four serene acres in the rolling hills of Fallbrook, this exceptional multi-unit estate offers a rare blend of privacy, versatility, and refined design. Tucked behind two private gates and surrounded by mature landscaping, the 4.08-acre property feels like a secluded retreat while still providing convenient access to nearby amenities. The main residence is a thoughtfully designed two-story home featuring 3 bedrooms and 3.5 bathrooms, including dual primary suites-one on each level-ideal for multi-generational living or hosting guests in comfort. The expansive floor plan is anchored by a large designer kitchen equipped for both everyday living and entertaining, with generous counter space, custom cabinetry, and seamless flow into the main living areas. Natural light pours in through oversized windows, while multiple access points lead out to sweeping decks on both levels, creating a true indoor-outdoor lifestyle. Under the home is an unfinished basement that can possibly add around 1000 extra sqft. Step outside to experience the home's standout features: expansive decks that overlook the tranquil grounds, perfect for relaxing or entertaining. The lower deck includes a private plunge pool, offering a refreshing escape with peaceful views of the surrounding landscape. Beyond the main home, the property includes two additional residential units, providing incredible flexibility and income potential. A detached casita offers 2 bedrooms and 1 bathroom, ideal for extended family, guests, or rental opportunities. Additionally, a spacious 2-bedroom, 1-bath apartment sits above an impressive 4,000-square-foot detached warehouse/workshop-perfect for business use, creative projects, car enthusiasts, or large-scale storage. The grounds are equally impressive, featuring a private basketball/tennis court with a waterfall feature, a tranquil zen garden for reflection and relaxation, a fenced garden with raised beds and cages, and wide open spaces that enhance the estate's sense of peace and seclusion. A private well can support the property with some infrastructure, while solar adds energy efficiency and long-term savings. Multiple private outdoor showers allows for connection to nature. With no HOA restrictions, abundant parking for multiple vehicles, RVs, or equipment, and a layout that supports both residential and professional needs, this property is truly one of a kind. Whether you're seeking a private family compound, an income-producing investment, or a