Open up the doors to a world of modern luxury and unprecedented privacy with this one-of a-kind completely custom 4 bedroom, 4.5 bathroom penthouse on Rittenhouse Square! Spanning over 5,000 square feet, this contemporary custom home features separate elevator access, direct freight elevator access in-unit, and is surrounded by 6 non-party walls for total privacy. Custom designed from raw space, this modern, luxurious 4 bedroom home features a rare and spacious open layout with pristine hardwood floors, 10.5' ceilings, ample recessed lighting, windows in every room for incredible natural light, 3-zone Nest smart thermostat, and beautiful custom gallery lighting throughout. This bright and open home features a chef's kitchen with dramatic one-of-a-kind marble island, soft-close custom lit cabinetry, large double windows, Wolf double oven with 2 warming drawers, Wolf induction cooktop with built-in grill and steamer, extra deep stainless steel sink with instant hot water, Grohe fixtures, Asko dishwasher, Sub-Zero French door refrigerator and freezer, and full-size Sub-Zero wine refrigerator. The grand entryway features 2 coat closets with built-in storage. A spacious dining area with ample seating and large double windows extends into an open entertainment space off of the kitchen. Off of the home's open foyer is a large living area and den separated by a stunning built-in marble top bar with built-in glass shelving. Both rooms offer oversized windows and generous natural light. The den features built-in shelving, a 12' Da-Lite projection screen, Sony projection system, and Yamaha 5.1 surround sound. 2 of 3 guest bedrooms are situated off of the main entryway. Both feature walk-in closets, large windows, and ensuite bath with modern finishes. A separate laundry room contains a Whirlpool Cabrio Platinum large capacity washer and dryer, tile floor with built-in drain, and built-in custom shelving and cabinetry. The third bedroom (currently being used as a home office) features double windows with William Penn views, walk-in utility closet with built-in shelving, and ensuite bath. A spacious master features oversized windows, custom walk-in closets, Royal brand sauna, and custom ensuite bath with groutless stone tiled rain shower, Air Jet soaking tub, Duravit ceramic sink, oversized double vanity, custom wood cabinetry, and commode.