Overall, the effect of this design is one of lightness, clarity, and restraint.
The design uses the Neo-Classical tripartite formula of base, shaft, and capital. The three-story base includes design references to the Italian and Spanish Renaissance, while the plainer upper section is set off with two-story pilasters and a wide cornice. The stone in the middle section is cut with little sense of depth, creating a nearly flat surface almost in the spirit of modernism.
The design of this limestone-clad building emphasizes the two street facades, leaving the other two unadorned.
The former First National Bank Building was named one of the 50 Most Significant Iowa Buildings of the 20th Century by the Iowa chapter of the American Institute of Architects.