The building was the district switchboard for the dutch phone company (PTT) The cellar was build like a bombshelter, housing the phoneswitchboard for the dutch government. The room was completely covered with copper plating (to prevent damage due to an EMP pulse).
The building now is closed and the bunker will be closed off indefinate. Below when you click on the image you will be diverted to a virtual tour of the bombshelter, with additional information (in dutch).
