The paper presents an analysis of collaborative processes in delivering mixed-use housing developments, with a focus on the adoption and roles of digital collaboration to address complex challenges. Extending the collaborative practice (CP) model, the research utilises a qualitative approach and an instrumental case study involving nine semi-structured interviews with key stakeholders from an award-winning mixed-use housing development in Australia. The study identifies key collaboration elements, such as early project establishment, a well-defined brief, and an adaptive integrated digital plan relevant to the interdisciplinary team. The scarcity of successful “extreme” mixed-use cases globally highlights the need for a core conceptual model for collaboration in complex housing developments, focused on digital collaboration, to support future projects in the sector. The research emphasises social innovation in mixed-use housing developments and highlights the importance of effective digital collaboration for addressing environmental, economic, and social sustainability needs. Contributions to the field extend both theoretical and empirical aspects of the CP model, critically exploring the potential of digital collaboration in mixed-use housing projects. The findings reveal critical elements for establishing a digital collaboration plan, leveraging technology to enhance stakeholder experiences and project delivery. The research is especially relevant in the post-COVID era, where digital collaboration gains significance for the industry.