The structural study includes a building made of reinforced concrete which consists of a ground floor and an underground tank of two apartments. The total area of the main building is approximately 45 sq.m. The structural system of the building consists of basement with perimetric reinforced concrete walls (reservoir walls). The ground floor level consists of reinforced concrete beam-column frames. The foundation of the building is formed as a mat foundation system of 50 cm slab thickness. Furthermore, an open tank of small depth (50cm), structurally independent from the main building, with an area of approximately 21 m², was studied. The analysis was carried out with the Fespa 22 v.8.3.0.16 software.