An Bord Pleanála has refused planning permission for more than 500 homes in Raheny.
The project which was initially given the go-ahead in April earlier this year would have seen 432 apartments and 104 houses built on lands at St Paul's College.
Locals were concerned that the development would destroy the nearby park of St. Anne's.
Labour Senator Aodhán Ó Ríordáin says the news is a positive for the community:
"It was always a very inappropriate proposal its a beloved park in the north side of Dublin."
"I've been fighting this for the local residents for about three years finally I'm just delighted that An Bord Pleanála has seen sense to reject the proposal which was going to destroy the environmental integrity of the park."
"I'm glad that the football pitches and the community facilities at that location have been saved."