I got to see Bobby by sheer luck this morning. I was facing NYU's Silver Center from the opposite side of the park when I caught sight of Bobby flying from one section of Silver's roof to a flag pole railing:
He had a pretty full crop:
He flew off his perch after four minutes, right out of the park (heading northeast). I looked for him at the Broadway-facing side of the terraced building in the photo above but didn't find him there.
A friend and I looked for him (and Rosie) throughout the park for a little over an hour but it began to rain and we were forced to leave the park.