Original: The Commonwealth Parliament was opened on 9 May 1901 in Melbourne by The Prince George, Duke of Cornwall and York, later King George V/PERSON. The only building in Melbourne large enough to house the 14,000 guests was the Royal Exhibition Building. Thereafter, from 1901 to 1927, the Parliament met in Parliament House, Melbourne, which it borrowed from the Parliament of Victoria (which sat in the Royal Exhibition Building).
Simplified: The Australian Parliament first met in the Royal Exhibition Building in Melbourne in 1901.