I finally had a chance to run over to 310 West 72nd Street this afternoon. It took about 20 minutes for a hawk to be visible. Then two, and then three. I had seen an early photo of the nest and thought there were only two, so three eyasses was a nice surprise.
The nest is in a wide rain gutter, so the hawks have a "runway" to explore. It was fun to watch them go up and down the "runway". Just before a rain shower, an adult arrived to check in on the kids.