Welcome to 17 Williams Street — a well-built, energy-efficient duplex in Lewiston. Constructed with insulated concrete forms (ICF), this 3,300 sq ft home offers exceptional durability & quiet living.Each level features 3 bedrooms, 2 bathrooms, in-floor heat, mini-split A/C, vaulted ceilings, and an open-concept layout. Both units include private laundry and a smart, functional floor plan, plus a newer roof for added value and peace of mind.Live in one unit & rent the other to cover more than half your mortgage, making ownership affordable even with taxes. Ideal for an owner-occupant, multi-generational living, or as a strong investment property — with the flexibility to convert back into a single-family home. Located close to schools and amenities, this is a smart buy and a rare find.