I know that the stores around the perimeter are rented by Blackstone and that the little flower areas around the perimeter are cared for by STPCV workers, so the response makes some sense.
However, I must warn that this issue of who owns what on the perimeter is not resolved by me, nor should it be resolved by anyone else. Is PS or Blackstone responsible for the ice cream truck that stands and stinks with constant exhaust the "service road" at the corner of 14 and First Ave.? That is a for instance, and there are a few others.
Now, according to Sabatino, the club cars must obey certain rules, such as not going against traffic. I see these club cars going against traffic frequently, even on Blackstone's loops, but this is the problem: In order for PS to do anything a resident must report this and the time so the monitors, which take pictures, can be checked. Okay, okay, I see you rolling your eyes, but that's what is said. I'm just reporting at this point.
We now know what the official stance is.
Update: You may want to watch this and pay attention to who owns the curb: