European Quarter of Brussels, is the unofficial name of the area corresponding to the approximate triangle between Brussels Park, Cinquantenaire Park and Leopold Park. The area, a portion of which was known as the Leopold Quarter for much of its history, was historically residential, an aspect which was rapidly lost as the EU institutions moved in. In Brussels, there are 3.5 million square meters of occupied office space; half of this is taken up by the EU institutions alone. The quarter itself is an administrative ghetto isolated from the rest of the city. 46% of the population of Brussels are from outside Belgium. About 3/5 of European Civil Servants live in the Brussels Capital Region with 63% in the communes around the European district.