This paper focuses on the context of the Autonomous Province of Trento in Northern Italy, which has hosted common regime institutions that manage collective mountain properties daily since the 13th century. These institutions operate in the most significant part of the territory and adapt their routines to emerging challenges. From different scientific perspectives (economic, anthropological, and architectural), we analyzed how this method has been actualized as the most effective management of local resources, generating opportunities for commoners, new citizens, and external users. This includes the exposure of the communities to novel economic activities, adaptation of the internal normative and planning systems, and reflection on how to combine natural resources with local needs and global scenarios.