Ferlito and Faticanti founded Nabito in 2007 and have since won several European awards for young architects.
CNN: High-rise living with a twist
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Ferlito, 37, said the concept for the Stairscraper came to them while looking at a spiral staircase in Istanbul and trying to imagine it as a building.
CNN: High-rise living with a twist
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"We were in Istanbul for the opening night of a building we recently built and while we were speaking we've been astonished by a spiral stair hanging from a building in front of us, " said Ferlito.