Welcome to unparalleled waterfront living at 99 Sumner St, Unit 321 in East Boston''s premier building, The Mark. This sun-drenched 2-bed, 2-bath plus den home offers stunning Boston Harbor and skyline views from all principal rooms, your private balcony and oversized windows. Enjoy an open-concept layout, elegant high-end finishes, custom automatic blinds, TWO GARAGE PARKING SPACES and TWO storage units. Full-service amenities include a 24-hour concierge, fitness center, terrace lounge with fire pits, golf simulator, conference room, pet spa, and more. With the MBTA Blue Line and ferry steps away, luxury and convenience await! Pets possible. Available 9/1 or 9/15.