The AZL Pension Fund Headquarters is an extension to an existing office building dating from the 1940s, in the center of Heerlen, the Netherlands. The old part of this building was constructed during a wealthy era of coal mining. The extension was completed in 1995 by Wiel Arets Architects, a local architect who operates world wide. WAA chose to use perforated steel plates, slabs of concrete and hints of black next to the old brick walls. On one side, a wide opening in the concrete boosts the buildings character.