The Columbus Post Office, designed by Roche Dinkeloo in 1970, was the first post office in the country designed by architects whose fees were privately funded. It is built of a salt-glazed tile, mirrored glass and COR-Ten steel. The tile was glazed reddish brown to match the color of the steel. Outer walls are mirrored to provide interesting reflections. From the interior, the walls are see-through. Inside, high ceilings provide a feel of spaciousness.