qnli question: During what two decades were the Parliament House, Treasury Building, Victoria Barracks, State Library, and General Post Office commenced? sentence: The 1850s and 1860s saw the commencement of Parliament House, the Treasury Building, the Old Melbourne Gaol, Victoria Barracks, the State Library, University, General Post Office, Customs House, the Melbourne Town Hall, St Patrick's cathedral, though many remained uncompleted for decades, with some still not finished.