Here is a modest, stripped down school building from 1969 in Garden City, NY. The building is completely abandoned, dating to the time when the entire St. Pauls complex closed in 1991. The building is a fine example of quiet contextualism (brick patterning, arched window surrounds that mimic the main school building, mansard roof).
But this hall really fades into the background when it is considered with the main core of the school, a high gothic masterpiece (seen below), that is sadly empty and threatened with demolition. More and better photos of St. Pauls can be found here and more about the fight can be found here. Hopefully the entire campus, including its mid-century additions (it also has a mundane gymnasium wing) can yet be saved.