SMJK Sam Tet continued to progress rapidly under the leadership of Brother John Moh who succeeded Brother Marcel in 1959. He organised several donation drives to extend the premises and purchase sports equipment. His effort paid off with the construction of a new 3-storey building. The school hall was erected in 1970 with the cost of RM200,000. Other facilities such as the library, the staff room and the administration office were included above the hall. The hall was opened by the Yang Mulia Raja Di Hilir Perak Darul Ridzuan on 5 June 1971.