Built in 1885, the former Public School 79, "a rare example of High Victorian Gothic school design in Manhattan", has been converted into an apartment building. The name of the school is still faintly legible above the main entrance.
Here's a bird's-eye view of the old school, which extends much deeper into the block than is apparent from the street. And here's a photo from 1920, shot from approximately the same angle as the one at the top of this post.
(I took these pictures down in the East Village after finishing my official walk uptown.)