The object move over the roof line horizontally and vertically. At one point it descended out of our sight behind the rooftop of the building. I then moved to the top of the front stoop to gain height and re-spotted the object. I saw it move for a few seconds and then it descended further out of sight. At this point we all decided to run up to our building’s rooftop to get even higher off the ground in hope to capture it on video again. When we reached the top of our building we saw the object again. It was hovering in one spot and then it started to ascend. Then it moved to our right. Then it appeared to move in our direction slightly. That is when I saw a glare of pure white light with a tint of blue. I have seen something similar to to this glare on the HID lights of some cars. We observed the object move in a straight line to our right and then back to the left. It ascended and hovered and then descended behind the same building it was flying over. There were many things that helped distinguish this object over its surroundings. The clouds, lights on top of buildings, airplanes flying by, background city noise, even airplane engine noise. This thing made no sounds that we were able to pick up.