Welcome to 17 Williams Street—a rare opportunity to own a well-built, energy-efficient duplex in a peaceful Lewiston neighborhood. Constructed with insulated concrete forms (ICF), this 3,300 sq ft home offers exceptional durability, quiet living, and year-round comfort. Each level features 3 bedrooms and 2 bathrooms with in-floor heat, mini-split A/C systems, vaulted ceilings, and an open-concept layout. 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. Situated in a quiet, residential area close to local schools and amenities—this is a flexible and rare find in today’s market.