Have received similar request also for Central Darling Shire. The request states Indigenous Business Australia (IBA), is a Commonwealth statutory corporation established by section 145 of the Aboriginal and Torres Strait Islander Act 2005 (Cth) and S188 of that legislation states that Indigenous Business Australia is not subject to taxation under any law of the Commonwealth or of a State or Territory.
I think it is a given that it is not rateable similar to any other property owned by the Fed Govt – but interested in other views.