The Pynchon School was built in 1891, and was situated right around where East Columbus Avenue runs today. The 1910 city atlas suggests that it was used as a temporary municipal office building while the Municipal Group was under construction following the fire at the old city hall. In 1946 it was listed as an annex of the Homer Street School.

Update: Here is a picture of the school as it was being used as a municipal office building.