It is planned that Adamstown, which is near Lucan in West Dublin, could become home to 20,000 people.
The arguments for and against the development made at the Gresham Hotel over the past week and a half will now be considered by the Inspector Des Johnson.
His report and recommendations will be sent to An Bord Pleanála for decision.
Objectors claimed South Dublin County Council did not provide them with the required information about the potential impact of traffic on the area.
They also argue that an Environmental Impact Statement is required for such a project, which is the first to be fast-tracked under the Government's new planning laws.
Developers felt the requirement for schools to be built in the area should not be included in the plans but left with the Department of the Environment.
The South Dublin County Council maintains the Adamstown plan is the most detailed ever, that its high-density will end urban sprawl and that concerns over traffic are simply misplaced.
