The only real high building on the KNSM-island is that of Wiel Arets, and with 60m it is not even that high. It was one of the last additions to the new housing district of the island and appears to be four towers in one since the block has been ‘cut’. The different apartment types have simply been stacked and each stacked tower is ‘fixed’ to the other with balconies. The facades are not of stone, but anthracite colored concrete that was cast into rubber elements of 2 by 2 meter. The same façade-system was used in apartment-tower De Hoge Heren in Rotterdam.