A research data commons can provide researchers with the data and resources necessary to conduct world class research. More than this, a research data commons can be transformational in facilitating change in the way research is conducted, in terms of both research culture and the availability of research data and analytical tools. This paper describes frameworks needed to build a transformational data commons, through examination of the development of the Australian Research Data Commons (ARDC) ARDC was formed in 2018 as part of a 20-year vision to transform Australia's research culture by enabling access to the digital data and eResearch platforms that can significantly enhance research capacity. ARDC is located within both national and international eResearch ecosystems, and its unique positioning must be understood, alongside the achievements of its three predecessor organisations, to understand the niche from which ARDC aims to provide maximum value and impact. Consideration is given to the challenges inherent in both the current Australian ecosystem and beyond, to articulate ARDC's focus going forward. The paper concludes with consideration of the international dimension, drawing on discussions around the development of a global data commons.