The capacity of the proposed International Convention Centre falls under the limits the founding study on the project said was needed to make it viable for a return to the economy.
"To improve economic growth New Zealand needs a centre that can accommodate an average of 3500 delegates in a plenary session," the report for Auckland Council and the Ministry for Tourism found in 2009.
Resource application documents filed with Auckland Council show the "Plenary Hall" has a maximum capacity of 3000 people - well short of an "average" 3500 delegates - and could drop further with talks of 10 per cent cuts to the centre.
Economic Development Minister Steven Joyce told the Herald this week that the ability to host fewer delegates in the main exhibition hall was not a major concern.