Trades Hall Office block Established by the developing trade union movement in 1888 and now owned by Unions NSW representing over 60 unions covering all fields of work. image Locate -33.877477198164, 151.2040868327 Milestone Constructed 1888 - 1917 {"name":"Constructed","target":"","target_text":null,"date":{"#markup":"<span class='date'>1888<\/span><span class='separator'> - <\/span><span class='date'>1917<\/span>"},"date_start":"1888","date_end":"1917"} Name Commemorated by Royal Australian Historical Society Green Plaque 30. Sydney Trades Hall {"name":"Commemorated by","target":"Royal Australian Historical Society Green Plaque 30. Sydney Trades Hall","target_text":null,"date":{"#markup":"<span class='date'><\/span>"},"date_start":null,"date_end":null} Position Architect Smedley, John 1888 {"name":"Architect","target":"Smedley, John","target_text":null,"date":{"#markup":"<span class='date'>1888<\/span>"},"date_start":"1888","date_end":"1888"} Type Office block {"name":"Office block","target":"","target_text":null,"date":{"#markup":"<span class='date'><\/span>"},"date_start":null,"date_end":null} image image