SIPTU has withdrawn its planning application for the redevelopment of Liberty Hall.
In a statement, the union said that it would be reapplying for planning permission within three months.
'We have decided to withdraw the current planning application due to detailed design issues,' said SIPTU General Secretary Joe O’Flynn.
'While the union, its professional advisors and Dublin City Council officials have worked hard to resolve these outstanding issues, time simply ran out on us.
'After detailed consideration, SIPTU has withdrawn the application to allow more time to resolve these matters and we intend to re-apply for planning permission within three months.'
Mr O’Flynn said that SIPTU remained fully committed to proceeding with the redevelopment and said the current building was no longer fit for purpose.