I went up to Highbridge Park to see if the eggs had hatched after visiting Inwood Hill Park. (At Inwood, I saw both parents, but couldn't tell if the chicks had hatched yet.)
After a long wait, the female got up and started feeding. The eyasses are still small, and I couldn't get an accurate count. There is only a hint of down in one of the pictures, but the videos clearly show the feeding.