Renovated top to bottom with the precision of new construction, this five-bedroom Nonantum townhouse opens with nearly 47 feet of sunlit, hardwood-lined living, running from a bay-windowed living room to a kitchen designed to be the center of the house. White shaker cabinetry with brushed-gold hardware, a pearlescent tile backsplash, floating shelves, and a waterfall island seating three beneath a trio of glass pendants set the tone, while a stainless gas range, wine refrigerator, microwave drawer, and French-door refrigerator do the work. A powder room and built-in mudroom bench handle the everyday comings and goings. Upstairs, the main suite rises under a vaulted ceiling to a spa-caliber bath of marble-look tile, a frameless glass shower, and a fluted wood double vanity, joined by two more bedrooms and a second full bath. The third floor adds a fourth bedroom and a lounge made for a media room, studio, or office, and the finished lower level brings a fifth bedroom with its own exterior access, a 33-foot bonus room, and in-unit laundry. Every system is new, and the home earned a HERS Index Score of 56, with an estimated $2,666 a year in energy savings over an average U.S. home: roof, windows, four-zone heat pump heating and central air, closed- and open-cell spray-foam insulation, LED lighting throughout, plumbing, and 200-amp electrical service. A covered front porch, an exclusive paved driveway for three cars, and a fenced side yard finish the package, with Boyd Park, the Charles River, Newton Corner, and the Mass Pike all a short distance away.