Property powerhouse Charter Hall completed the deal with the backing of a large Canadian pension fund. : Property powerhouse Charter Hall has struck an $830 million deal to buy Telstra's Melbourne headquarters with the backing of a large Canadian pension fund, as it rides a wave of investor enthusiasm for commercial property. Charter Hall Group and its $5.4 billion Charter Hall Prime Office Fund will share ownership of the premium 47-storey office tower at 242 Exhibition Street with Canada's Public Sector Pension Investment Board.