the structure, built in 1911, was designed by architect james knox taylor, who served as supervising architect for the u.s. department of treasury at the time. the building operated as the central headquarters for the post office in bradley county until 1985. since then it has housed the downtown postal station, with po boxes and zip code 37364, and additional offices of the county government, which is why it is known as the courthouse annex. it was listed on the nrhp on june 30, 1983, and was still known as the u.s. post office at the time. the building was renovated and restored in 2000.