Within the field of Structural Restoration, there are a variety of design strategies aimed to the defence of architectural and historical heritage. Between them, one of the least common, yet undoubtedly efficient, is the design of variable trim resistant settings. This refers to designs that allow structures to adapt their configuration during construction or use stage, optimizing the material’s resistance to the stress regimes they will experience. This approach has been applied to the restoration of the masonry structures supporting the “Passeggiata del Belvedere” at “Palazzo Reale,” Naples, a charming 100-m-long eighteenth century, which was subjected to destructive bombings during World War II. It was rapidly reconstructed using heavy reinforced concrete walls and slabs. The progressive degradation of this material, over more 60 years, has required its replacement. Important problems related to functional factors of the artifact, recommended the re-proposition of the structures of the “Belvedere” according to the original matrix all in tuff masonry, a material of volcanic origin widespread throughout the Neapolitan area. In addition, new maintenance requirements have determined the need to adopt special wall partitions called “frenelli” (curbs) set on the masonry vaults below, to support the level of the planking. A double-strength scheme will be set on these elements, with an initial structural arrangement for overall loads. In addition, an other resisting structural scheme, modified from the previous one, will be obtained with just a few manufacturing. This will also make it possible to cope with the stresses induced by accidental overloads.