When you first see Shigeru Ban’s latest project in New York, you might not know that he designed it. Unlike his strikingly modern Metal Shutter House there, Cast Iron House, a luxury condominium building at 67 Franklin Street in the Tribeca neighborhood, is, on the outside, exactly what its name implies: a cast-iron facade, designed by W. Wheeler Smith and completed in 1882. It is registered as a New York City Landmark facade and is on the National Registry of Historic Places. But behind this fully restored facade is essentially a new building that is as contemporary as you would expect from the Tokyo-based architect.