The only Arts and Crafts houses in the Crown Heights North Historic District
Vacated in 2003. The Housing Authority has plans to demolish the three remaining towers, but that obviously has not happened yet. Take a look around in Street View.
The Catskill Aqueduct is one of three aqueduct systems that supply water to NYC. I would guess that "blow-off" refers to a valve that allows water to escape the pipeline if the pressure in the system exceeds a certain threshold.
One of the leaders in the NYPD's controversial stop-and-frisk campaign
Here's a much better photo taken by someone else.
Shuttered in 2005. The hospital once looked like this.