Today, I after a good deal of searching I was able to find the fledgling and the adults. My first sighting was a parent going west off of the student center towards Washington Square West. Then after about ten minutes both adults were on top of an apartment building on the NW corner of the park. It's unusual to see them together at this spot, so I hoped the fledgling was nearby. One of the parents kept flying to a building on the SW corner of the park, so I guessed the fledgling was on one of the western buildings. But I couldn't find it, but could hear Blue Jays from the park. So I went out to Sixth Avenue and from in front of the IFC movie theater could see the fledgling on a railing of the SW building on the park. It was foggy, so the photographs aren't great. But I felt like I had been a great detective to find the fledgling!