The building will be used to house music and mathematics.
The third floor of the main development has also been restored to accommodate the history department.
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The £3.3million project was delivered from the School Enhancement Programme.
Education Minister, Peter Weir, said: "I have been very impressed by these excellent new facilities. I am sure that the £3.3million investment at the school will have a positive impact on pupils, teachers and school staff now and for generations to come. Investment under the School Enhancement Programme is having tangible benefits on our schools creating a better place where pupils can learn and flourish."
(CD)
