Welcome to 17 Williams St--a rare opportunity to own a well-built, energy-efficient duplex in Lewiston. Constructed with insulated concrete forms (ICF), this 3,300 sq ft home offers durability, quiet living & year-round comfort.Each level features 3 beds & 2 baths with in-floor heat, mini-split A/C systems, and vaulted ceilings. Both units include private laundry and a smart, functional floor plan. A newer roof adds to the home's value and peace of mind.Whether you're looking to live in one unit and rent the other, need space for extended family, or want a strong investment property--this home checks all the boxes. With its layout and structure, it also offers potential to be converted back into a spacious single-family home. Close to local schools & amenities--this is a rare find.