Film production crews?
Here in sleepy Kensington?
Go back to Park Slope
Film crews show up in adjacent neighborhoods all the time, turning the Victorian mansions of Ditmas Park into the Hamptons or having the brownstones of Park Slope stand in for a Manhattan that doesn't actually exist. But at the corner of Albemarle and East 5th? Either they're working on a reality show about elderly Russians or they took a wrong turn.
Also, if you're like me and you love this kind of thing, check out this great map. Props to the 11218 for its diversity.