Perth Historical on Wikimedia Commons The City Of Perth Oldest Building. (1836-37) This building was erected as a Court House between 1836-37. Was designed by Civil Engineer H.W. Reveley and stood close to the Original River Foreshore 28 Barrack Street , Perth, WA 12 Aug 1970 by WA Historical Society on 12 August 1970 Colour: marble Wikimedia: Flickr: Google Streetview OpenStreetMap