It isn’t often that such an extraordinary condominium, in a highly coveted elevator building on the Charles River, is offered. Perched on the 8th floor, this penthouse boasts superlative river views expanding from Boston to Belmont. Every room has an extraordinary view - the unit’s southern exposure is all window, with access to the largest balcony on the Charles River - over 70 feet long. Professional mgt. 24-hour concierge service. Assigned parking space.