IPE Real Assets understands that Charter Hall is due to announce the acquisition. : Australian property group Charter Hall has agreed to buy an office tower in Melbourne for around A$800m (€496.4m) from Oxford Properties and an unlisted Investa fund. IPE Real Assets understands that Charter Hall is due to announce the acquisition of Telstra Tower as early as Wednesday. The A$5.3bn wholesale Charter Hall Prime Office Fund (CPOF) is expected to be a part owner of the asset.