I started my day exploring Central Park without any luck, then Washington Square without any luck and finally found two hawks in Union Square. For those unfamiliar with New York City Parks, Union Square is about eight blocks north of Washington Square and can be seen from that park's nest.
In Union Square, I first spotted Rosie, the adult female, between the W and U of the W Union Sq sign, at Park Avenue South and 17th Street. I then saw a young hawk hunting around the Square's main lawn. It was most likely Boo. It caught a small rodent. The hawk looked very healthy and has its mother's enthusiasm for hunting, making at least ten passes at squirrels.