Octagan craft with lights over a hundred feet wide seen upclose

It was an autmn sunny afternoon there were 3 of us having a conversation in the corner.  It sounded like and felt like a helicopter was coming towards us from north new york headed south towards an international airport just a mile away from our location.  I knew it wasnt a plane because it was way to low.I looked up to see what kind of helicopter was coming,but what i seen was no helicopter.  It was about a hundred feet in the air moving very slowly.  I was right under it.  It was like an octagon shape with lights surronding it.  It must have been over a hundred feet wide.  I compared it to the building it was flying over.  It continued to move slow until it passed us across the street from the corner we were on.  It started to hover over a tree on the other corner across the street.  Then all of a sudden it just beemed straight up into the sky and vanished.I ve never seen anything move so fast it must have been faster than a blink.  I looked at my friend and I knew he seen it too by the paleness and open mouth, because I had that same look.  The other guy is looking at us funny and says whats wrong with you guys, you look like you seen a ghost!  We both shouted at the same time did you not see that?  The tree is now dead I think.  But I wish there was a way to get this tree examined before it is cut & discarded.
Witness elects to remain totally anonymous; provides no contact information.  PD