Floors 10 and 11 of the as-yet unfinished building known simply as 16w21 are a generous duplex for sale with elegant contents installed by Posen over the last seven months. "My own apartment came with history and age," says Posen. "Here it was about creating warmth, something that had a sense of glamour to it . . . a lifestyle."
The two floors are connected by stairs with a velvet railing. "Like a box at the Metropolitan Opera," says Posen, cautious not to tread on the train of night-life guru Amy Sacco, just steps ahead. The coffered modernist paneling of the central hallway on 10 is painted robin's egg blue. In a bedroom to the left, pink fabric button-tufts a rococo carved bed frame. Red velvet drapes line the walls. Across the hall, the kitchen has been finished in dark teal. "That was the most fun to design," says Posen. "I had visited the Menil home in Houston, and I loved the Philip Johnson design. So I created surfaces that look as if they would wipe right off."