Eric, and the rest of my French friends, this is for you. This magnificent building, over 120 years old, houses the french embassy. The mansion has a very interesting history, you can read all about it in the embassy's webpage.
L’Ambassade de France à ATHENES (in french)
Το κτίριο της πρεσβείας (in greek)
Where is it on the map? (mouse over the yellow square)