25 BIS is an intimate portrait of a masterpiece from the beginning of Auguste Perret’s career: the building located on 25 Bis, Rue Franklin in Paris. The film looks for the intangible and subjective element of the building’s history: the depth of its human print. The building appears as a sedimentation of life stories where each layer has left the trace of a passage. From the intimate nature of these stories, the film draws this fragile and undefined essence that could be called “the soul of the place”.