This is NOT a 1-room school, but it is of the same time period, being built in 1926. It is a high school, and looks like it had four rooms on the main floor, with a full basement. Looking in the window I could see a normal water pump coming out of the floor on the north side of that lower level!
On 520th St, at the NE corner of Derby Ave, about .75 mile west of Angle Road. Directly across the street from Washington #5. Now used by the Washington Township Optimist Club.
The first photo was taken looking at the west side of the building. Notice in the last photo, of the north side of the building, there is a place where a third set of windows used to be.