Land speculator Henry J. Miller purchased the western, corner lot in 1871.

Throughout the years, the Union Block has housed a variety of commercial stores on the ground floor and offices on the second.

[2] The Union Block is a two-story, six-bay, rectangular red brick Italianate commercial building.

Three rectangular windows topped by brick hoodmolds and keystones are in each of the west two bays, while two rectangular windows topped by brick hoodmolds without keystones are in each of the east four bays.

[2] The western facade, along Ann Arbor Street, contains a fire escape, more windows, and entrances on both stories.