Additions to the museum since 1970 include the establishment of the National Ranching Heritage Center (1976), the construction of facilities at the Lubbock Lake Landmark (1990), the building of the Diamond M Wing to house the Diamond M Fine Art Collection (1995), the addition of the Helen Jones Auditorium and Sculpture Court Wing (2001), the building of the 18000 sqft NSRL Addition (2004), and the construction of an educational space addition to the Nash Interpretive Center at the Landmark (2007).