It is currently part of Arizona State University's Downtown Phoenix Campus, where it houses student organizations, counseling services, administrative offices and the ASU Police Department.

A good example of federal architecture adapted to a regional tradition, in this case the Spanish Colonial Revival, the building was erected during the years 1932 to 1936.

[2] A site was chosen in 1931 and Phoenix architects Lescher and Mahoney were commissioned to design a six-story building that was intended to house all of the federal services in the city.

For a variety of reasons, including the unexpectedly high cost of land acquisition, the design for a three-story rather than a six-story building was submitted to the Treasury Department for review.

The only federal building from the period remaining in the city, the Post Office possesses substantial architectural merit as an example of Spanish Colonial Revival design.

[2] In 1938, the Fine Arts Section of the Treasury Department commissioned artists La Verne Black and Oscar E. Berninghaus to paint two murals each to embellish the public space of the office.

Trim is primarily cast stone and concentrated around the entries on the east and west and the end bays on the north, each of which is distinguished by ornate, Classical treatments.

As the main public level, the first floor contains the most architecturally detailed space, the post office lobby which runs the width of the building.

Light courts fill in the open spaces of the "F."[2] Architectural integrity of the Federal Building-Post Office is generally quite high on the exterior but somewhat impaired on the interior.