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Next to the Australian Museum on William Street is this old building.
The heritage register says:
The former William Street National School is historically significant as one of only two surviving examples in central Sydney of the forty-four national schools established between 1848 and 1851. The school served as a model for other schools in New South Wales, and is physical evidence of the change from church schools to state controlled schools.
Designer/Maker: attributed to Henry Robertson
Builder/Maker: Unknown
Construction Years: 1851 - 1851