Eldon B. Mahon United States Courthouse, Federal courthouse in downtown Fort Worth, US.

The Eldon B. Mahon United States Courthouse is a five-story steel and concrete building faced with limestone in downtown Fort Worth. Its Art Moderne design includes classical symmetry, with the first three floors forming a rectangular block and the upper floors E-shaped around two light wells. Eleven sets of three-story windows angle outward to a central mullion, creating a zigzag pattern across the facade.

Congress appropriated $1.215 million in June 1930 for a new federal courthouse, and the building was completed in 1934 during the Great Depression under New Deal-era federal construction programs. It was listed on the National Register of Historic Places in 2001 and renamed in 2003 for Judge Eldon Brooks Mahon, who oversaw the 19-year racial integration of the Fort Worth School District.

Three oil paintings by Frank Albert Mechau from 1940 hang on the fourth floor and represent the only New Deal art commission in Fort Worth. These works show how artists were asked to contribute during that era.

The interior is open to visitors but plan for security screenings required at all federal buildings. Visiting during regular weekday business hours offers the best access to public areas and viewing spaces.

The north lobby keeps its original terrazzo floor of multicolored marble in a zigzag pattern, edged with pink Lepanto marble. Over each pair of bronze and glass doors on West Tenth Street sit aluminum grilles carved with Mayan ziggurat, Plains Indian arrow and Egyptian lotus motifs.