Rarely available 4-bedroom, 4.5-bathroom Penthouse triplex residence on picturesque Marlborough St with 2 tandem garage parking and direct elevator access to all floors. The magnificent front facing living and dining room is complete with high ceilings, a gas fireplace, large skylight and an elegant bay window with beautiful views overlooking tree-lined Marlborough St. The chef's kitchen is equipped with custom cabinetry, stainless appliances, a large island and opens to the bright and sunny great room featuring another large skylight. The primary suite has a tall bay window overlooking Marlborough St, fireplace, 2 large walk-in closets and a luxurious five-piece marble ensuite bath. There are also 2 additional guest bedrooms and baths on this floor. A separate bedroom with ensuite bath is located on the lower level and could function as in-law/au pair suite, media room or home office. Boutique building of only 2 units with an outstanding location steps from all Back Bay has to offer.