Rarely does an opportunity like this come along in one of Marin’s most beloved towns. Ideally located along Mill Valley’s vibrant Miller Avenue corridor, this beautifully updated and fully vacant duplex offers a wonderful blend of flexibility, comfort, and convenience - perfect for owner-users, extended families, investors, or those looking for additional income potential.Just moments from downtown Mill Valley, Highway 101, the lumberyard, award-winning schools, shops, restaurants, cafés, and endless hiking and biking trails, the location offers the very best of connected Marin living.The upper residence features a light-filled 3-bedroom, 2-bathroom layout with open living spaces, updated finishes, and a warm, welcoming feel throughout. Off the upper residence, a private outdoor patio area and yard space create the perfect setting for entertaining and relaxing.The lower one-bedroom, one-bathroom unit is thoughtfully renovated and offers incredible versatility - ideal for rental income, guests, extended family, a private home office, or creative space.Both units have been extensively updated with remodeled kitchens and bathrooms, hardwood floors, updated appliances, quality cabinetry, and in-unit laundry. Additional improvements include a newer roof, redwood deck, retaining walls, seismic retrofit work, and fire sprinkler system. A spacious two-car garage adds valuable storage and utility space.Whether you choose to live in one unit and rent the other, create a multigenerational setup, or simply enjoy the flexibility of having two beautifully updated residences, 288–290 Miller Avenue offers a rare opportunity in one of Mill Valley’s most convenient and accessible neighborhoods.