A one-of-a-kind designer townhouse boasting custom finishes and a prime Upper East Side location, this gut-renovated 5-bedroom, 5.5-bathroom home is a paragon of contemporary Manhattan luxury. Features of this 19.6' x 70', 5100sq. ft. masterpiece include Grade-A white oak flooring, a trio of wood-burning fireplaces, a remote-controlled Emtek electric lockset system, a private backyard and terrace, restored original details that include the staircase and all fireplace mantels, a Fujitsu Thermostat, a Ring alarm system with integrated cameras, a laundry room with Caesarstone quartz countertops, a side-by-side washer/dryer, and a utility sink, and a forward-thinking design that allows for easy elevator installation and rooftop development with plumbing/electric already completed. In addition, the house comes with air rights fully intact. The garden level of the home contains a guest bedroom with a Carrara marble en-suite bathroom, a pristine powder room with Nemo Tile marble and Restoration Hardware fixtures, a formal dining room, and a sublime eat-in kitchen. The dining room has a double height ceiling with a wall of windows overlooking the backyard, while the kitchen is equipped with a huge waterfall island, sleek Caesarstone quartz countertops, incredible imported marble Panda Marble backsplashes, and a suite of fully-integrated high-end appliances from Kitchenaid, Sub-Zero, and Miele. The parlor floor contains a pair of formal living spaces and a full wet bar with Turtle granite surfaces, ample wine storage, and an under-cabinet fridge. The remaining four bedrooms sit on the third and fourth floors of the house. The master bedroom boasts four custom reach-in closets, a private terrace overlooking the backyard, and a chic en-suite bathroom with a custom double vanity, marble mosaic floors, a Victoria & Albert walk-in shower, and a free-standing soaking tub. Each of the remaining three bedrooms have custom closets and marble en-suite bathrooms. All bedrooms have motorized window treatments. 505 East 84th is situated less than a block from Carl Schurz Park and the East River. It is just steps from restaurants, bars, cafes, and shops, and is close to several schools. Nearby subway lines include the 4/5/6/N/Q.