Protestant Hall Office block Commercial building at 238-240 Castlereagh Street built in 1878 for the NSW Protestant Hall Company Ltd. In 1938 it became home to the Australian Workers Union, whose name still appears on the front of the building. Milestone Constructed 1878 {"name":"Constructed","target":"","target_text":null,"date":{"#markup":"<span class='date'>1878<\/span>"},"date_start":"1878","date_end":"1878"} Type Office block {"name":"Office block","target":"","target_text":null,"date":{"#markup":"<span class='date'><\/span>"},"date_start":null,"date_end":null}