The St. Mary School Building, designed by the local Fond du Lac architectural firm of Frank Stepnoski and Sons and built in 1948-1949, is a distinctive and exemplary early modern school building designed in the Contemporary architectural style. Before World War II, Fond du Lac school buildings, whether public or private, elaborate or simple, were designed in historical styles.

The St. Mary School Building is an early post-war example of modernism used for a school building in the city. Its rectilinear form, flat roof, horizontal bands of windows, and use of non-historic, abstracted decoration, as well as modern interior elements, exemplify modern schools being built after World War II. Within the local context of Fond du Lac, the St. Mary School Building is the earliest of this wave of modern educational construction. The building retains excellent exterior and interior historic integrity.

The building retains historic integrity and clearly conveys its historic appearance as a school. Overall the building is largely intact and appears as it did historically when occupied by St. Mary’s Parish and operated as the St. Mary School.

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