The Public Trust Office Building is an office building in central Wellington,completed in 1908. It is the only (surviving) building "made of a true New Zealand granite – from Tonga Bay in north-west Nelson."It is also believed to be New Zealand's first steel-framed office building.In 1894, Government Architect John Campbell was asked to start drafting plans for the building.It was eventually opened by Prime Minister Sir Joseph Ward on 9 June 1909.The Minister in charge of the Public Trust, Āpirana Ngata, invited a number of Members of Parliament and Wellingtonians to the opening event. The event included a lunchtime banquet, concert, and dance in the evening.