This landmark building was designed by the
Office of the Supervising Architect of the U.S. Treasury Department under
James Knox Taylor. The building was constructed in 1912 in the
Beaux Arts Classicism style. This style of architecture was commonly used for important public buildings from the end of the 19th century until the early years of the 20th century. The building's symmetry, monumental form,
balustrade, and
pilasters (attached columns) are characteristic of Beaux Arts Classicism. The original portion of the building is three stories tall and faced with
limestone.
Pediments, arched openings, and shallow balconies are other notable components of the facade. The roof is covered with red tiles. The original building was enlarged on two separate occasions. In 1919, an addition that doubled the building size was constructed on the west side of the original building. The Office of the Supervising Architect was once again responsible for the design, which was executed in the Beaux Arts Classicism style to blend with the original portion of the building. The facility was enlarged again in 1932 when another addition was completed. Both additions were carried out by the Office of the Supervising Architect under
James A. Wetmore. This second addition, located on the western end of the 1919 portion, once again respected the Beaux Arts Classicism of the earlier portions. As part of the 1932 expansion, a centrally placed tower was added over the 1919 addition. The tower features stylized decorative motifs that are characteristic of
Art Deco architecture, which emphasizes the verticality of the design and incorporates Classical forms while minimizing ornate elements. File:OK-OKC-USPO-courthouse-southwest.JPG|Southwest corner File:OK-OKC-USPO-courthouse-northwest.JPG|Northwest corner File:OK-OKC-USPO-courthouse-southface.JPG|South entrance File:OK-OKC-USPO-courthouse-nrhp.JPG|National Register of Historic Places plaque The interior is as impressive as the exterior. In 1992, the U.S. General Services Administration restored major public spaces to their original splendor. The lobby, which runs the length of the building, contains a barrel-vaulted ceiling with arched openings that contain geometric, metal grilles. Also in the lobby, the patterned tile floor, green-and-gold starburst ceiling stencils, brass chandeliers, and bronze elevator doors were restored. Elaborate ceilings in the courtrooms, some of which contain skylights with grilles, were refurbished. An ornamental painted ceiling was added to the ninth-floor courtroom. Although the ceiling was shown as part of the architect's original design, it was not executed during construction in 1932. Two murals near the main entrance were painted in 1935 as part of the
Works Progress Administration program. Covered up during modernization work, the murals have since been restored. One depicts a Postal Service
Pony Express rider seal, and the other is an image of the
Great Seal of the United States. The first floor lobby contains two paintings by
James D. Butler that were installed in 1993. "
Sunset Near the Chisholm Trail" symbolizes the cowboy heritage and agricultural significance of Oklahoma. "
A View Near Tahlequah, Cherokee County" symbolizes the state's Native American legacy and natural beauty. ==Significant events==