The Klauthmonos square, indispensably related with the very history of the 19th century Greece, still preserves a few impressive buildings from that period. One of them houses today an administrative service of the Navy. The exterior of the edifice still retains all the architectural features of its style and time, which add an air of European grand-bourgeois character to appearance, while the interior had greatly suffered by various, multiple uses. Recently, during our military service, we have worked for the restoration of the interior decoration of the building: the painting embellishments of the ceiling and walls that were thus revealed, being in accordance with the appearance of the exterior, restor the lost, passed glamour of the mansion and enrich the cultural heritage of Athens.