Introducing Penthouse 9 at Gracie Green - A full-floor showstopper with nearly 1,000 square feet of private outdoor space. Perched atop this boutique Upper East Side condominium, Penthouse 9 delivers the rare kind of outdoor living New Yorkers dream about: two sprawling terraces totaling over 900 square feet, including a 720-square-foot private terrace that spans the full width of the building...