In observing my particular section of 5th Avenue and 13th Street, I noticed that this particular cross street had a lot of loungers; people that were just hanging out on corners having a cigarette, sitting on hydrants having their lunch break, in front of the mini-bodega sipping on coffee talking to their dogs, and most of all, passerby's that would stop and stoop in front of the school to either adjust their belongings or have a quick smoke. Also, sometimes there would be a cluster of people in front of the building on the sidewalks that would take up the entire area, preventing people that need to get by to continue on their way. I also noticed that a lot of the people walking by were definitely thinking about something because they just seemed so unaware or oblivious to things around them which showed through their facial expressions.
The only real "problem" that I noticed would probably be the cluster of people that would collect every now and then. Perhaps if along the other areas that are not a part of the school they had small benches or something that people could perch on for a bit, it would take people off of standing still in the middle of the sidewalk. Similar to the ledges below the windows of Parsons where a lot of students tend to gather, but closer to the side and out of the way on the sidewalk.