My WPA book refers to it as ‘modern architecture’ — the US Post Office and Courthouse in downtown Chattanooga:
Art Deco, yes…
The Section arranged for this sculpture of cast aluminum, ‘The Mail Carrier’ by Leopold Scholz. It was installed in 1938.
Scholz’ wife, Belle Kinney of Nashville, was herself a famous sculptor, and they worked on many projects together, namely the pediment sculptures of the Parthenon in Nashville, ‘Lady of Victory‘ the WWI Bronx County war monument in NY, the bust of President Polk in the Nashville State Capitol, and the busts of John Sevier and Andrew Jackson at the US Capitol. 
The building, designed by architect Reuben Harrison Hunt, was built between 1933-34, and in 1937 its plans were “selected by the American Institute of Architects as one of the 100 distinguished and representative buildings in the United States erected since 1918.” It’s on the National Register.
