Obsidian House, a new development inside New York City's second-oldest cast iron building, is so called for its dark facade and a "unusual extruded roofline" that was added by WORKac to "resemble jagged forms of volcanic rock." The three-story, five-bedroom penthouse with a rooftop shower spa tub is now on the market for $7.45 million, in addition to three two-bedroom loft-style units, one of which is on the market for $2.95 million. The property is developed by Knighstbridge, who is also behind Shigeru Ban's lauded Cast Iron House.
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