Retention planning permission has been refused for a range of antenna and transmission dishes at Kingston Road in Knocknacarra.
Cellnex Ireland Limited had sought permission to retain the development on the roof of Kingston Hall.
A number of submissions were lodged by local residents, who argued that the communications equipped was not included in permission for the development.
City planners have now refused retention permission for 9 antenna and 6 transmission dishes on support poles, and all associated equipment.
They held it's positioned in a significantly elevated location within public view, is out of character with the area, and would seriously injure residential amenities.
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