This study analyzes control rights over pusako tinggi under Minangkabau custom, its legal status when no successor to customary authority remains, and its transformation into public waqf. The legal research applies normative juridical and conceptual approaches, supported by statutory analysis and a socio-legal inquiry in Jorong Marambung, Nagari Baringin, Palembayan District, Agam Regency. Data were obtained through literature review, in-depth interviews, and documentation, then analyzed through reduction, narrative display, conclusion drawing, and verification. The findings show that pusako tinggi remains the collective property of the clan, while the mamak kepala waris holds a managerial trust. The absence of a successor does not automatically convert it into individual property while the clan continues to exist. Formally, pusako tinggi is not family waqf because it was not established by a founder, intention, and waqf declaration, although its features resemble a quasi-family endowment. Transformation into public waqf is possible when management fails, deliberation secures approval from the clan, customary leaders, and Nagari Customary Council, and a waqf pledge and nazir appointment follow. This model preserves the asset and connects customary with Islamic law.
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