|The William and Phebe C. Dunn House is locally significant under Criterion C for the architectural significance of this well preserved pioneer-era brick dwelling. Built in 1866, this Italianate-influenced dwelling was built of locally made brick and regionally obtained limestone. It was constructed by local masons, carpenters, and other craftsman then working in Marion, which was the first county seat of Linn County. The Dunn House is important for its association with the pioneer era of Marion's development, its vernacular expression of a nationally popular architectural style (Italianate ), and its association with a row of similar brick buildings built around the same along a two-block section of 10th Street extending from 5th A venue to just north of 6th Avenue. The other buildings in this section of 10th Street are contributing buildings to the already-listed Marion Commercial Historic District, with the Dunn House just outside of the district but certainly complementary to the historic look and feel of the district and its environs. The period of significance and significant date is 1866, the year the house was built.