This 4,200 square foot condo duplex in the heart of Tribeca, New York is an amazing work of art. The centrepiece of the duplex is a cast-iron and mahogany staircase that was welded together inside the home. The master bedroom has walls covered in cotton-satin panels with hand-embroidered silk to resemble a Japanese bamboo garden. There is also a spa-like master bathroom. The living room is connected to a 900-square foot patio.