Final answer:
Franco Purini's counter-proposal in the 1970s is titled 'Les Halles.' Les Halles was an alternative vision to the Pompidou Center, which was designed by Renzo Piano, Richard Rogers, and Gianfranco Franchini and has become a cultural landmark.
Step-by-step explanation:
The title of the counter-proposal by Franco Purini in the 1970s is Les Halles. In the context of architectural developments during that era, Les Halles was an influential project as it aimed to re-envision the urban landscape of Paris. The project that ultimately came to fruition in that area was the Pompidou Center, designed by architects Renzo Piano, Richard Rogers, and Gianfranco Franchini, commissioned in 1971.
While Franco Purini's proposal was a counterpoint, the Pompidou Center itself represents a significant shift in architectural style and has served as a cultural landmark in Paris since its completion.
The project is often celebrated for its high-tech architecture style, which was revolutionary at the time. Insight into the design process and the impact of the Pompidou Center can be explored through various resources, such as the video on Vimeo, titled Pompidou Center, Paris, 1971-11.