Welcome to this beautifully updated, sun-filled duplex in the heart of South Arlington, offering the rare combination of modern upgrades, flexible living space, and exceptional walkability. Featuring three bedrooms on the upper level - an uncommon find among Arlington duplexes - plus a fully equipped lower-level au pair suite, this home offers outstanding versatility for guests, multigenerational living, or rental income potential with no HOA. The bright, south-facing interior is filled with natural light throughout, highlighted by a stunning bay window in the living room and a skylight upstairs. Solid hardwood floors create a warm, move-in-ready feel across the main and upper levels. The beautifully renovated kitchen showcases soft-close white cabinetry, elegant Taj Crema quartz countertops, and brand-new stainless steel appliances, including an induction cooktop and convection oven with built-in air fryer and pizza stone. Step directly from the kitchen onto the rear deck for seamless indoor-outdoor living overlooking the fully fenced backyard. Downstairs, the spacious lower level features a private fourth bedroom with a full bath, its own kitchen, abundant storage, and a laundry room conveniently positioned between the lower-level living space and the stairwell leading to the main living areas. Outside, the fully powered oversized shed offers an ideal space for a home office, gym, studio, or creative retreat, while two additional exterior storage areas provide even more functionality. Major upgrades include the kitchen renovation (2026), gutters (2026), a stone retaining wall in the front yard (2025), electric panel (2022), upstairs bathroom renovation (2021), water heater (2019), roof coping (2019), and custom Elfa closet system in second bedroom (2025). The home is also fully wired with Cat6 Ethernet cabling, supporting modern work-from-home professionals with reliable, lower-latency connectivity. With driveway parking for two cars, abundant storage, and thoughtful upgrades throughout, this home offers both comfort and convenience in one of Arlington's most connected locations. All of this is ideally situated just moments from the restaurants, shops, and entertainment along Columbia Pike, including the beloved Arlington Cinema & Drafthouse. Enjoy quick access to major commuter routes including I-395, I-495, and the George Washington Parkway, while remaining approximately 10 minutes from the National Mall.