The strategy for the intervention was to utilize the underground levels for the expansion of the museum. This strategy allows for heritage/historical buildings in dense urban plots to be renovated without altering their original character. Thus, 1300 square meters of exhibition space, warehouses, conservation laboratories and visitor services areas were added in two underground levels beneath the northern and southern courtyards of the Museum. 300 square meters were also added to the northern patio on the ground floor in order to incorporate more access points for pedestrians.