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Abstract:  Valco San Paolo, in the loop of the Tiber, although originally a publicly owned urban area laid out by the 1931 Urban Development Plan (its indications were partially carried out between the 1940s and 1960s before the General Urban Development Plan was approved in 1965), nowadays appears residual, incomplete and fragmentary for its urban design, land use and built environment. This depended much on how the prescriptions from the original 1931 plan were modified by the two subsequent executive plans dating from 1943 and 1949. The 1931 Urban Development Plan outlined a precise picture of the proposed urban structure of the area including blocks, “new alignments” and building typologies expressive of their use (“industrial buildings”, “flats”, “public parks”) as well as the main elements of the public space. The modified executive plan approved in 1949, that replaced the first one approved in 1943, outlined a different and less defined urban structure compared to that of the original document: the layout of the urban plan, the regulations and the building types had all been modified. While the original plan provided a clear design based on alignments and especially blocks and industrial buildings, the new one applied a zoning principle, with a prevalence of residential blocks without going into the specific subdivision of the land for building purposes. In addition, a clear principle guiding the transfer of the land to private owners for construction objectives had not been defined nor was it possible to deduce provisions for urban public space and formal results from the contracts. The change from an industrial to a residential destination for many areas in the executive plan, marked the new direction taken by the administration which intended to reduce the industrial weight of Rome and concentrate the production zones to the east of the city. A brief analysis of the events and documents confirms the preceding conclusions.