A developer has offered to lease close to 500 apartments in Coolock to the state for social homes.
Planning permission was granted two months ago for 471 flats, in blocks up to nine stories high, at the old Chivers jam factory.
The developer had looked for permission to have 495 apartments in blocks up to ten stories.
Councillors have described the development as a 'monolithic monstrosity' and warned that it could become a new Ballymun.
Independent councillor John Lyons has called for the original proposal, involving 350 apartments as high as five stories, to be built instead.
He says increasing the density of the site was greedy;
"If built it will seriously injure the local community in Coolock.
The infrastructure locally, the roads, the public transport and the visual amenity, the visual character of the community will be destroyed, it will be an eyesore."
The city council says it would consider using 30 percent of the development for social housing.
