This former post office rises over Duke Street like a Renaissance bell tower on a Venice canal. The post office was completed in 1892 with designs by Architect Will A. Freret. He had been the federal government’s supervising architect from 1887 to 1889.
Architect James H. Windrim followed Will Freret as the U. S. government’s supervising architect. Windrim modified Freret's original plans for the post office and received final approval for Freret's designs.
Architect C. Emlen Urban was the project’s on-site supervising architect. He worked closely with James Windrim on the construction. C. Emlen Urban later redesigned the building's interior when the city converted the post office to the municipal building in 1931. The building serves as City Hall today.
The building is constructed of Indiana limestone in a Venetian Renaissance style. It has an arcaded first floor, and a bell tower having a copper-clad dome and belvedere.