In the meantime, in May last year, the couple were told their property was liable for commercial rates. They say it should be exempt as it is mainly their family home for them and their two children.
Earlier this year, in a separate case against them by a Dublin City Council rate collector, the High Court found the couple were liable for a rates bill of €75,000 for 2013-17, despite their contention the property was not rateable.
The couple had separately brought judicial review proceedings seeking to quash the decision to revoke a previous decision making the premises exempt.
It was claimed the Valuations Office initially said it should be exempt, but a couple of months later a manager in that office decided that decision was a clerical error as a result of a misunderstanding.