The Centennial Park and Moore Park Trust, set up in the early 1980s to maintain and protect eastern Sydney parklands, has been preparing new masterplans for the area.

It has courted controversy by increasingly hiring out land for private events. It has fought off a bid by the neighbouring Sydney Cricket and Sports Ground Trust to build a new stadium on its land.

And it has been doing all of this without a lawfully constituted board.

According to the Centennial Park and Moore Park Trust Act 1983, the Trust is to have seven trustees appointed by the Environment Minister, and an eighth appointed as a representative of community groups.

But for the past two years, the trust has had only five trustees. And the Trust does not seem to have been properly constituted since at least 2013.

The failure of the government to appoint a proper number of trustees was raised last year by Greens MP Mehreen Faruqi.

In response, the former environment minister, Mark Speakman, told Dr Faruqi at an estimates hearing in September that "If there is a statutory requirement to have more, then I will address that urgently".

In January, Mr Speakman wrote to Dr Faruqi to say the government was "currently working" to fill the vacancies.

"I agree with you about the importance of having a strong board and would be pleased to update you in due couse."

But four months on, the appointments have yet to be made, prompting accusations that the government does not want a properly constituted Board.

"One can only assume it suits the government not to have strong trustees who get in the way of their agenda," Dr Faruqi said.

"We have seen chaos at the Centennial Park and Moore Park Trust with the continued failure to defend public land and the environment, including the loss of trees for the light rail and the resumption of land for the white elephant, the Tibby Cotter Bridge," she said.

A spokesman for the current Environment Minister, Gabrielle Upton, said: "The Minister expects to finalise the appointments for the positions soon."

"The Trust can conduct its business with the existing appointed trustees."