The City Of Perth's Oldest Building. This Building was erected as a court house between 1836-37. Was deigned by the Civil Engineer H.W. Reveley and stood close to the original River Foreshore. 28 Barrack Street Perth, Perth 12 Aug 1970 by WA Historical Society on 12 August 1970 Colour: marble Wikimedia: Flickr: Google Streetview OpenStreetMap