The Sydney Morning Herald of Friday 22 Aug 1924 carried a brief report on the formal opening of the school of arts and memorial building the previous day in the small country NSW town of Culcairn.
The Soldiers' Memorial Hall bears the 1924 date above a trio of leadlight windows, an Australian WWI soldier portrayed on the centre panel.
While the portico on the corner, which I presume was added after WWII, carries the dates of that global conflict.
Reference:
1924 'MEMORIAL SCHOOL OF ARTS.', The Sydney Morning Herald (NSW : 1842 - 1954), 22 August, p. 10, viewed 4 April, 2014, http://nla.gov.au/nla.news-article16172717