Further extension of the building to accommodate the exhibition of the major donation by Eleni Stathatou in the basement (architect: Emmanuel Vourekas).
Conversion of the building from a residence into a museum, and to ensure that it would meet the specifications for a Museum, an additional wing was added beside the ballroom (architect: Anastasios Metaxas).
The building is enlarged with the addition of a ballroom and some necessary auxiliary areas (architect: Anastasios Metaxas, who had designed the restoration of the Panathenaic Stadium).