Commanding Charles River views, private garage, an additional off-street parking space, and more than 3900+ square feet distinguish this exceptional waterside Beacon Street residence. This exceptional two-level residence offers sweeping Charles River views, gracious proportions, and the convenience of two-car parking, including your own private garage directly into your home. Expansive picture windows flood the grand living room and dining room with natural light, while soaring ceilings, three fireplaces, and elegant architectural details capture the timeless character and scale of Back Bay. The main level is designed for both sophisticated entertaining and comfortable everyday living. A richly appointed cherry wood kitchen with Sub-Zero fridge, Wolf induction cooktop, double Wolf ovens, built-in microwave and compactor. Kitchen opens to generous living and dining spaces, all thoughtfully positioned to showcase spectacular river views. An expansive office/den with custom built-ins including wet bar provides a refined and versatile retreat for working from home, reading, or relaxing. The bedroom level features three spacious sleeping rooms and beautiful new marble spa-inspired bathrooms, including the primary bath with a soaking tub, double vanity, and separate shower. A second entertainer's kitchen adds exceptional convenience for hosting guests, while a sun-filled atrium and adjoining bonus room offer flexible space for a potential fourth sleeping room, game room, media room, or additional lounge. Combining remarkable views, flexible living spaces, two-car parking, and a coveted waterside Beacon Street address, this distinctive home presents a rare opportunity to enjoy classic Back Bay elegance with modern comfort and exceptional versatility.