Treasury Holdings has been given permission by the High Court to pursue its legal challenge against the National Asset Management Agency.
Treasury wanted permission to challenge NAMA's decision to call in its loans and appoint receivers to some of Treasury's assets.
Ms Justice Mary Finlay Geoghegan ruled that Treasury had raised substantial issues for the court's determination and granted the group permission to proceed with its case.
She also ruled that NAMA can bring an application to have Treasury provide security for costs and an undertaking in relation to damages if it wishes.
The case will be back before the court on Tuesday.
Treasury Holdings says NAMA's decisions to call in loans of around €1bn and to appoint receivers to certain property assets in January were irrational, disproportionate and an unfair exercise of the agency's powers.
The company's lawyers argued there had been an absence of fair procedures and Treasury had had a right to be heard before the decisions were made.
NAMA claimed Treasury was insolvent, past the point of rescue and had no viable business left without money from the agency: money it was not obliged to give.
It said a lengthy process was undertaken before receivers were appointed and Treasury had had every opportunity to say why the agency should not have acted in the way it did.