This 3BR/3.5BA duplex in the Annabelle Selldorf-designed Sky Garage was listed in 2007 for $6.2 million but couldn't find a buyer until 2011, when it finally sold for $4.52 million. A year later, it was flipped for $6.87 million, and today, a year after that, it's back on the market for an even $9 million. How quickly times change. The layout hasn't been altered in the past six years, but the apartment has been updated with automated sound and security systems and electronic shades, so there's that. There are also the 23-foot ceilings in the living room as well as, of course, the en suite car elevator. This is one of two active listings in the building, the other being the completely redone $23 million penthouse.