The city of Barcelona has initially approved the conversion of the former Comedy Cinema into a museum Dedicated to Modernism (Casas, Rusiñol, Mir, and Nonell) and haute couture gowns, at the initiative of an investment fund and the Carmen Thyssen collection. I write this sentence with care, the subject of which is "the city of Barcelona." The urban planning document has been made public, allowing for a detailed analysis of what Barcelona City Council proposes regarding the ever-more controversial assumptions of urban planning law: the community's participation in capital gains generated by urban development and the principle of the social function of the right to property.