Survey says possibly and/or that they launched a stapler through the thing. From the mailbag:
Did someone lose their sh*t at 375 Park this morning? Heard a window was blown out (as in from the inside), on one of the upper floors. By the time I got there, looks like they had it patched up (guy was still on a lift though). Two people told me there was quite the crowd there this morning. Caution tape everywhere and tourists taking pictures.