All it takes is one glance at this head-turner to see that it’s pretty special. The 11,000-square-foot duplex features glass floors, floor-to-ceiling windows offering 360 degree views of the Hudson River and the city, and 5,200 square feet of outdoor space in the form of several terraces. The stunning penthouse has had a time of it on the market, first popping up in 2012 with an $80,000 a month price tag, and then reappearing in October 2014 asking $95,000 a month. Now it’s trying its hand at the sales market for $39.8 million.

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