Wealthy investors who bought into a special fund holding Melbourne Airport marketed by Dexus have retained their own lawyers as they gear for a legal battle between the ASX-listed property group and its co-investors.

Dexus could be forced to sell a 27.3 per cent stake known as the Dexus Bloc in Australia’s second-biggest airport after its co-investors, which include IFM Investors and the Future Fund, claim it inappropriately used confidential information.