An Bord Pleanála is giving the go-ahead for the construction of a massive development on the grounds of Dun Laoghaire golf club.
The scheme includes more than 800 apartments and houses, office buildings, shops, public parks and new roads.
Local residents had lodged objections with An Bord Pleanála, but their case has been rejected by the appeals body.
It has, however, attached a number of conditions to the development, which is due to be completed on a phased basis over the next 10 years.