Rare, sprawling, open floor plan multi-generational option living w over 5,100 sq ft across four finished levels provides everyone their own space. This luxurious home has giant kitchen with upscale appliances, leading to indoor and outdoor dining areas, grand LR, 1st-fr bedroom & full bath. Second floor has 4 big beds and two full baths.  Gigantic 3rd-floor has primary suite with spa bath (steam shower/jetted tub), office, sitting area, and skyline sunrises. The walk-out lower level w/ private entrance, huge LR, full bath, kitchenette, gym and laundry is ideal for in-laws, an adult child, live-in help, hosting company, or even rental income. An entertainer's paradise with 2 ovens, 2 dishwashers, and 2 washer/dryer sets, the home can run as two households at once. 2 car garage, 4 car pkg. High on hill quiet dead-end street, with picture windows framing Cambridge and the Boston skyline. Top Belmont schools nearby; easy access to public trans, food, shopping and the city of Cambridge.