If it's a new charge for something that wasn't previously considered part of the rent then I think there'd be no comeback?
That would appear to be the factual position - look at the letter reproduced in this article:-
http://www.thejournal.ie/robin-hill-3380861-May2017/
I don't see any breach of the new rent control rules in this case.
Incidentally, the fact that the landlord has to terminate the remaining tenancies on a phased basis (as a result of the "Tyrrelstown amendment" introduced last year), in order to secure vacant possession of the block, is actually keeping much needed properties off the rental market.
Another good example of the unintended consequences of Government interference in the market.