This thesis delves into the soul of Iganzio Gardella’s church, a lost legacy nestled in the complex of Teresio Borsalino Rehabilitation Center (previously called as the Sanatorium of Anti Tuberculosis Vittorio Emmanuele III) in Alessandria. More than an architectural artifact, the church embodies the confluence of modernist ideals and therapeutic intent, while remaining a place of great historical and cultural value for people of Alessandria. A key example of Rationalism, the church is analyzed through the lens of historical exploration, advanced survey methods, digital documentation, restoration analysis, and concludes into envisioning a new life for this structure. As a beacon of Rationalist architecture, the church becomes a lens to reflect on the evolution of design, the narrative of decay, and the profound role of architecture in healing and community connection.