Dublin City Council has been granted a permanent injunction preventing a Westmeath businessman from using Dartmouth Square Park in South Dublin as a car park.
Noel O'Gara bought the park last year for less than 11,000 euro which is now the subject of a compulsory purchase order.
Mr O Gara had argued unsuccessfully that the planning laws being used by the council were unconstitutional.
Today in the High Court Mr Justice Michael Hanna gave the city council the injunction they required to stop him converting the space into a car park.
Mr O Gara has confirmed that he plans to appeal the decision to the Supreme Court