Squatters in Ft. Greene/Clinton Hill/Prospect Heights?

Can any of the readers out there let me know if they know of an abandoned or gutted house in the nearby area that has squatters/vagrants using it as their housing?

A friend lives close to one and has noticed that a plywood door leading to the inside is always open or shut, depending on whether the squatters are inside or not. One morning, they even saw a person come out of it in the morning.

They made two calls to 311 and 911 and the cops came once, but they never went into the house to see who was there.