I'm going to say that since the library is old and used more as a refuge from the cold than as an actual library for years now, most windows are probably broken and boarded up. But for the few windows that are still intact, yes, most likely tempered glass used in NYC.<br/><br/><strong>Edit:</strong>Had to share some cuteness (http://sorisomail.com/email/74298/como-se-danca-o-merengue.html)<br/>