More money is needed to proceed with a New Plymouth gallery dedicated to showing the works of kinetic artist Len Lye.
In 2012, the New Plymouth District Council announced it had raised the $10 million needed to build the gallery from grants and scholarships.
The council now says it has a building tender price from Clelands Construction, but there may be a shortfall of $750,000.
Council members will decide at an extraordinary meeting at 4.30pm on Thursday whether to approve the tender and underwrite the extra money.
Lye was an internationally renowned artist known for his kinetic sculptures and films, many which were bequeathed to the city.
But critics have called the proposal a waste of money that will burden ratepayers.