Once a haven for student activities, the "Old Student Union Building" is a name that better describes the building's historic use. Today, though the name Old SUB stuck, this facility is home to the University Police Department and its Parking Services, the International Student Office and the Office of Education on Demand.
The north portion of the building is home to a weight room used by West Texas A&M University student athletes.
The West side of the building houses Panhandle AHEC, a USDA office, a Texas Parks and Wildlife Office, English as a Second Language office and the Texas Forestry Commission