For sale: $29,992,000. This elegant 4,871 square foot, 4 bedroom, 4.5 bath home has expansive windows and boasts the grandest proportions of any unit at Walker Tower. 18A is the only residence in the building with 2 south-facing terraces, each with breathtaking views of downtown and the harbor, as well as a separate dining room. The sprawling living room and dining room extend to the oversized, eat-in-kitchen which features custom Smallbone cabinetry, marble and limestone countertops and Dornbracht fixtures. The appliance package includes wine cooler and both a refrigerator and under-counter refrigerator/freezer drawers by Sub-Zero; an induction cooktop, wall oven and warming drawer by Viking; speed oven and built-in coffee maker by Miele and a Franke Water Filtration System. The first-floor master bedroom suite has double exposures and terrace access, a windowed en suite bathroom with a freestanding cast iron bathtub, heated towel rack and a steam shower with fixtures all by Waterworks. The other 3 bedrooms also have en suite custom marble bathrooms, some of which are windowed. This home includes radiant floor heating, ebonized French herringbone oak flooring, a Crestron Home Automation System and Nanz hardware, throughout. Custom-designed features include large tilt and turn windows, millwork and lighting. Additionally, this duplex residence has a fully pre-wired sound system and includes a built-in humidification system, a central air conditioning system, as well as a dedicated ventilation system. This apartment features upstairs and downstairs laundry rooms, and ample storage. The comprehensive amenities package includes a 24-hour doorman, concierge, library lounge with pantry and bar, refrigerated storage for deliveries, children's playroom, bike storage room, fitness center with yoga room, sauna and landscaped common roof deck with dining area, sun lawn, observation area and covered cabana room.