Nestled on a quiet cul-de-sac in Marlborough’s sought-after West Side, 20 Federal Street is a beautifully updated Colonial offering over 3,100 sq ft of refined living. The flexible layout includes a luxurious main-level suite with spa bath and walk-in closet, plus a second ensuite upstairs—ideal for guests or extended living. The spacious kitchen opens to a sunlit breakfast nook, formal dining, and two inviting living areas with fireplaces and custom trim. Recent updates include roof (2022), windows (2017/24), HVAC (2022), tankless hot water (2022), floors, fixtures, and solar panels (2022) for energy efficiency. Set on just over half an acre with a deck(2021) and stone patio, this home offers both privacy and proximity to AMSA, the Lake Williams Boardwalk, APEX Center, Rail Trail, Ghiloni Park, and commuter routes (Rt 9/495). A rare blend of space, sophistication, and location—this one stands out.