This dissertation deals with the application of the methodology of preservation on historic concrete constructions. The early concrete structure will be analysed from several points of view: artistic or architectonic value, construction history, structural behaviour, procedures historically followed for the design, on-site and laboratory testing of constitutive materials, modelling and seismic analyses. The past industrial building in Marghera is taken as a case study here. It was built in the 50s and is going through the conversion into the commercial and business complex.