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This study examines interorganizational relationship (IOR) in the run-up to the 2024 Olympic and Paralympic Games, focusing on the partnership between Paris and Seine-Saint-Denis. The objective is to analyze how individual and shared public policies are jointly developed to pursue legacy objectives. Using an IOR theoretical lens, we assess the extent to which the aligned goals and joint structures have shaped cooperation between these two territories. The analysis draws on twenty-three semi-structured interviews conducted between 2021 and 2023 with public and Olympic stakeholders, alongside eight policy documents covering individual and joint public policies. Findings reveal that the partnership is not merely symbolic: it reflects a strategically coordinated effort to leverage the Games for long-term impacts, such as urban and social legacy. Moreover, this collaboration demonstrates how mega-events can act as catalysts for integrated public policy development beyond the event itself.