A fellow Hawk-watcher and I had been looking for the Washington Square Park Hawks for nearly an hour and a half with no sightings until another friend alerted us to a Hawk a few blocks north of the park.
The Hawk was Sadie, sitting atop the same building the Hawk-watcher saw her and a fledgling on two days ago (the 19 story Cardozo Law School). The Hawks tend to gravitate to this building year after year. It is not surprising though since it is quite tall and provides a clear view down 5th Avenue so the Hawks can keep an eye on Washington Square Park and the surrounding area.
We watched her perch and get harassed by a Mockingbird for 17 minutes before she flew eastward:
The Google Maps screen shots below display where the Law School building is in relation to the park:
Lost and found: