Gothic details—window bays, an entrance porch, pointed-arched windows decorated with tracery, and ornate roof cresting—seemingly are pasted on this crisp and clean, two-story cube with side wings. The low, hipped-roof house is in the Gothic style but retains the lingering classicism in its use of flanking entrance columns, in the manner of Maximilian Godefroy's use of classicizing elements in St. Mary's Chapel (1806) in Baltimore. The formal-style house was built for Mann, a promoter and stockholder of the Michigan and Southern Railroad, a promoter of the Monroe harbor and canal, a lawyer, and Monroe County treasurer. Nearby at 304 S. Monroe Street is the stone Gothic Revival Trinity Episcopal Church (1868–1869 with later additions) by John Addey.