Rarely available Back Bay 3-unit condominium building on premier Riverside Beacon Street, just 3.5 blocks from the Boston Public Garden.This 6-story building offers stunning Charles River views, exceptional light with both south and north exposures, & timeless appeal with original architectural detail inc. bay windows, 9 fireplaces, high ceilings, and hardwood floors. Tastefully renovated kitchens and baths throughout. Multiple outdoor spaces include a roof deck and rear decks overlooking the river and Boston skyline—perfect for entertaining. Property consists of 3 units: a garden-level floor-through 1+ bedroom, a 3-bedroom duplex spanning the first and second floors, and a penthouse triplex on the third and fourth & fifth floors with private roof deck, water feature & grill. Rare 5–7 car parking. Steps to the Esplanade, close proximity to Newbury Street shops & dining, MGH, and the Financial District. Ideal opportunity for owner-occupants seeking rental income or long-term investment.