The high school building was listed on the National Register of Historic Places in 1974.

It features a large central bell tower that is flanked by two projecting pavilions that are capped by a stepped-gable roof, and turrets at the corners.

The final expansion was the brick annex that was built to the south of the main building.

The Castle on the Hill Association acquired the building from the local school district for $1 in 1976.

NuStyle Development Corporation of Woodbine, Iowa converted the building into apartments.