Known as the 'Year 5 Block' to some and the 'Year 4 & 5 Block' to others it is the last block of Classrooms that was constructed at Prep School and was completed just prior to the retirement of Mr. J. S. L. Fernando as the Headmaster. It was one of the buildings that was badly damaged by the gale force winds that wreaked havoc on the School in November 2017 and was temporarily repaired as the plan at the time was to eventually bring down the building to make a larger playing area for the students. However, time and tide have taken a toll on the building and the Headmaster commenced repairing it on an urgent basis. The cost was met by a donation for the Old Boys' Union (OBU) and the Old Thomians' Association in the United Kingdom (OTAUK).