This is a beautiful and ornate fire escape on the back lot of the Puck Building in SoHo (South of Houston Street). The building, or the front facade of it, is probably most famous as the place where Grace Adler of the tv-series, Will & Grace has her office.
The building got its name from the two gold statues of Puck, the Shakespeare character in "A Midsummer Night's Dream," at the front entrance. It is now home to the New York University's Wagner Graduate School of Public Service.