Dublin City Council is to probe An Bord Pleanala's decisions on housing developments in light of controversies around the board.
Fast-track housing projects, called Strategic Housing Developments, of more than a hundred units can bypass DCC and go straight to ABP for planning permission.
There have been countless SHDs across Dublin in recent years, many of which are build-to-rent developments which the council has been trying to clamp down on.
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Deputy Chair of ABP Paul Hyde has stepped down temporarily from his role as probes into decisions on the board continue.
Mr Hyde has denied all allegations of conflict of interest made against him.
Housing Minister Darragh O'Brien has appointed Senior Counsel Remy Farrell to carry out a report into the situation and ABP has commenced an internal review.
Last week, a DCC Subcommittee was given a presentation on a proposal for the largest ever Strategic Housing Development in Belcamp on the Malahide Road in North Dublin.
The development proposal includes 2,527 residential units which would make it the biggest ever under the fast-track scheme which allows it to bypass Dublin City Council.
Sinn Fein Councillor Micheal Mac Donncha told the meeting the controversies surrounding ABP means we have a "planning crisis".
He said: "This SHD application of course now goes to ABP and I want to welcome, Lord Mayor, your commitment on the basis of our emergency motion to write to ABP about all the planning implications for the city about what is going on in that body at the moment.
"As we all know, we have a housing crisis but I think now we have a planning crisis because effectively ABP is imploding."
In 2016, an independent review of the board was set up by then Environment Minister Alan Kelly which made 101 recommendations. Just 36 of these recommendations have been fully addressed, according to reports.
Cllr Micheal Mac Donncha said: "It's an unreformed body. There were recommendations made in 2016 that it should be reformed including the method of appointment of members nothing has been done in the interim by successive governments. So we have a very serious situation."
Lord Mayor Alison Gilliland confirmed she would "write to ABP outlining our concerns with regard to the impact of the conflict of interest issue and seek a full report on planning decisions and applications in Dublin city".
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