This 3BR/3.5BA unit in the Time Warner Center, the second most expensive building of 2013, was purchased in 2009 for $14.5 million and received a makeover from Joel Sanders, the architect behind, among other things, the suicide prevention screen at the Bobst Library at NYU. Sanders' redesign of this 3,491-square-foot TWC pad knocked out some walls, making the whole thing more open, and more sleek and modern-looking. As a result, the apartment is now back on the market asking $35 million ($10,025 per square foot). Highlights include "Norwegian wood walnut paneling and flooring in the kitchen area and custom white concrete floors in the living/dining areas" as well as "switchable glass in the 3 bathrooms that allows for translucency when privacy is required or transparency when the occupants want to take in the breathtaking views of the park." This is the second most expensive unit currently available in the building, with the first being a 54th-floor combo asking $50 million.