Spokesperson for Dublin, Senator Kevin Humphreys, made the announcement after the application to An Bord Pleanála means there is no certainty that the proposals will proceed.
Senator Humphreys said: "The decision to make an application to An Bord Pleanála for the long expected plans for a civic plaza at College Green introduces huge uncertainty as to whether the plans will go ahead.
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"This will also add further delays to the project, meaning it will be over two years before the work is done, should it get permission.
"Dublin City Council could have pursed a Part 8 planning application which has been used for many major projects in the past.
"Instead, the earliest likely date for a decision by An Bord Pleanála is October, with the work then expected to take 18 months to complete, bringing us to April 2019."
(CD/LM)
