The mechanized shutters have horizontal perforated slats that allow the resident to see out when closed but block out the city's prying eyes. When the shutter rolls up it reveals a terrace which is separated from double-height living rooms by windows that can also be raised to create one large indoor/outdoor space.The units range from three-bedroom, 1,950-square-foot duplexes with terraces to four-bedroom, 2,700-square-foot duplexes with terraces and one four-bedroom duplex penthouse which has 3,319 square feet and 1,963 square feet of outdoor space including private roof deck. The units start at $3.6 million and the penthouse, shown above, is listed at $10.5 million.