Ariel West updates the concept of luxury living from the 19th-century ideal of larger spaces and lavish details to include amenities such as a fitness center, community garden and private terraces. These family apartments also boast expansive views toward both Central Park and the Hudson River. Where the building meets the street, its scale is in keeping with the existing street fronts. Set back over 40 feet, the slender glass tower was designed to be as transparent as possible, allowing it to represent a new stage in the residential development of the Upper West Side.