Magnificent 3+ bedroom penthouse duplex, with direct elevator access to both floors, features incredible private outdoor space, gleaming natural sunlight throughout 15 windows, and 1 outdoor parking space with EV charger. Enter the main floor to a welcoming foyer which leads to a wide open fantastic chef’s kitchen, complete with gas cooking and breakfast bar, coupled with the expansive family room, dining area, and gas fireplace. Custom built-ins offer plenty of storage. The gracious living room showcases a second fireplace and several sitting areas. Adjacent to the living room is the office with an oversized window overlooking picturesque Marlborough Street. A grand staircase, accented by a beautiful skylight, leads to 3 bedrooms beginning with the elegant primary bedroom featuring a spa-like bathroom and 2 large walk-in closets. Two additional guest bedrooms (plus a bath) offer lots of optionality. Enjoy the private roofdeck showcasing 3 sitting areas and panoramic views of Back Bay.