Entire floor penthouse residence with a magnificent 2,144 square foot terrace overlooking Rittenhouse Square! Enter the home, designed by the renowned Joanne Hudson, through a grand foyer that leads into an expansive great room basking in natural light from a wall of floor-to-ceiling windows. The great room provides access to the terrace and opens up to a cozy media room/den. Adjacent to the great room is a chef's kitchen with breakfast room. The kitchen features a four-person island and high-end stainless steel appliances including a Sub-Zero 36" fully integrated refrigerator and freezer, Wolf 36" stainless steel gas cooktop, Gaggenau 48" stainless steel hood, Miele fully integrated dishwasher, and Franke 23 sink. The breakfast room features a modern wall-mounted electric fireplace and overlooks 18th Street. The spacious primary suite has his and hers walk-in closets and his and hers marble appointed bathrooms. The second and third bedrooms each have ensuite marble appointed bathrooms and spacious walk-in closets. The one-of-a-kind terrace atop Rittenhouse Square features a hot tub, fire pit, and built-in outdoor kitchen that is perfect for entertaining. There is a mudroom off of the foyer that has excellent storage space and provides another access point to the terrace. Additional highlights include a powder room, washer/dryer and hardwood floors throughout. Residents of the Alison enjoy the security of a 24-hour doorman and can use some of the amenities of 10 Rittenhouse for an additional fee.