I saw a black triangular object in the sky when I left work on 11/19/2012 at 7:58 pm. I walked out the side door of my office building. I had just walked up some stairs onto the outdoor plaza between two 4 story buildings and I saw a black triangular shaped aircraft flying very slowing above me between the two buildings. The aircraft had blinking white lights on the three corners and gave off a glow around the edges. The aircraft came from the southeast and flew very slowly to the northwest. I heard no noise. There were no other people in the plaza at the time. The situation felt surreal and calming at the same time.