Introducing a premier townhouse opportunity on Waterside Beacon Street complete with spectacular Charles River views, elevator access to all floors and garage parking for 3 cars. This historic mansion, designed by the firm Snell and Gregerson in 1864, seamlessly blends magnificent architectural detail with modern updates. Outstanding features include ornate moldings and decorative plasterwork throughout, seven fireplaces and soaring ceiling heights in the sun-filled rooms. Enter the main floor boasting a Great Room with access to an expansive deck overlooking the lagoon on the Charles, perfect for entertaining. One floor above is an eat-in kitchen and an adjacent dining room showcasing exquisite period detail. The third floor is dedicated to the primary suite complete with a luxurious, renovated bath. The lower level features a home gym with full bath, an au-pair/guest suite with kitchen and direct access to the garage. Exceptional location close to all that Back Bay has to offer.