A mosque which was originally only a storey high, Masjid Kassim or Kassim Mosque is built on a piece of wakaf land which currently stands at Changi Road and has been around since the early 1920s. Back then, the mosque could only accomodate around 700 worshippers. 

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Wakaf Kassim consists of its mosque, the surrounding residential areas and a burial ground in Siglap Road.  It was developed for the maintenance of the Kassim Mosque and to ensure that the burial grounds at Siglap were well-kept. 

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The land was given by Ahna Mohamed Kassim Bin Ally Mohamed back in 1921 and given to 4 trustees when he passed on 31st July 1935.