...It may qualify as the most blandly corporate space Mr. Gehry has created.

Compare this with the service stairwell at the back of the building. Made of rough exposed concrete, the 10-story staircase is pulled back from the glass facade, creating a narrow, vertigo-inducing slot that allows you to peer down into an outdoor courtyard. The staircase overlooks a romantic, perfectly framed view of the Empire State Building, but the clash of raw concrete, glass and aluminum has more in sympathy with the surrounding rooftops: a clear indication of where Mr. Gehry’s heart lies. It may be the most gorgeous service staircase anywhere in New York. (It has now been painted various shades of yellow, however, dulling the effect.)