The Sisters of Charity of the Blessed Virgin Mary arrived in Dubuque and started teaching in the parish school in 1843. The building that became their parish convent was built as a girls' school sometime in the 1880s. It is a three-story, brick, Second Empire style structure built on a limestone foundation. It features a mansard roof, eaves, a simple cornice and stone trim. The five-bay main facade has a small porch over the main entrance. The windows on the first two floors are flattened arch windows, and the third floor round arch windows are placed in dormers. The building was converted into living space for the sisters after a new school building was constructed in 1904. The building has subsequently been sold by the parish and converted into senior housing.