Exquisite and highly upgraded custom home in sought-after River Run of Oswego near Washington Park! This meticulously maintained & updated home features over 3,800 sq. ft. with 5 bedrooms + main-floor den & home office, 3.5 baths, a 3-car garage, 9' ceilings on all 3 levels, and a fully-finished WALK-OUT lower level perfect for entertaining! The first floor features a large den, formal living, and dining room that leads to an upgraded Chef's kitchen with prep island, new quartz counters over crisp white shaker-style cabinets & SS appliances. The kitchen opens to a huge family room with cathedral ceilings & wood-burning fireplace and also opens to a large multi-level maintenance-free deck that overlooks a professionally landscaped yard with many mature trees, plus a large mud room w/ laundry adjacent to the 3-car garage. The 2nd level features 4 full bedrooms with a newly upgraded hall bath and a huge primary suite featuring cathedral ceilings, a walk-in closet, a separate cozy sitting room, and a new luxury primary bath featuring classic subway tile, quartz counters, new shaker-style cabinets, large walk-in shower & separate soaking tub, double-vanity & flat-black hardware. The fully-finished walk-out basement features an additional bedroom, home office, a full bathroom, an impressive wet bar, and tons of space & natural light from the large windows and sliding glass doors that all open to a professionally landscaped patio and rear yard with fire-pit & BBQ areas. Prime lot with a rear yard back gate that opens to the water park! New updates feature all-new windows, sliding doors, front door & side lights, primary & hall bathrooms, furnace & A/C, ejector pump, water-softener, flooring, and newly painted throughout...even a brand-new mailbox! The River Run is an idyllic neighborhood walking distance to top-rated schools, 9-acre Washington Park (features, playground, soccer fields, baseball back, walking trail with benches & pergola) beautiful downtown Main Street Oswego, the Fox River, the expansive 20+ mile Fox River trail, and perfect for commuters near I88, the Aurora Metra stops & proposed Oswego station, as well as all the area shopping, dining & more!