Alternatively known as The Sydney High School, due to its being the first state high school, Sydney High School was established as two single-sex schools sharing a single building, with boys and girls on separate floors. The first day of instruction, for 46 boys, was October 1, 1883 and was at a building located in Castlereagh Street in the Sydney central business district, which was designed by Francis Greenway and constructed by convicts. From 1883 to 1892, Sydney Boys occupied the lower floor and entered from the Castlereagh Street side of the building, whereas Sydney Girls occupied the upper floor and entered from the Elizabeth Street side. In 1924, this building would be demolished and both schools would, in 1921, have relocated to Moore Park. Presently, this site is home to the Elizabeth Street store of David Jones.