More documents and evidence will be required to be submitted to the commission by close of business Monday in order for the multi-million dollar development to progress.

In a letter to Cambria Green's lawyer Shaun McElwaine dated July 4, Tasmanian Planning Commission delegate Ann Cunningham highlighted concerns over information provided and potential deficiencies in consent letters.

"The Commission considers this information is necessary to determine whether it has jurisdiction to proceed with the matter," Ms Cunningham wrote.

Ms Cunningham said Ronald Hu's witness statement claimed Chinese businessman Keijing Liu was the sole director and the controller of each of the corporations listed in paragraph three of his statement, including Shenglong Hong Kong Investment Ltd.

However, the appended Company Registry extract for the company identified Lihua Li as the director and holder of 9000 shares of the company. Keijing Liu was a minority shareholder with just 1000 shares.

Ms Cunningham said this suggested Keijing Liu was not the only owner of the company.

The commission also remained concerned that consent from just one of two directors of Cambria Green Agriculture Development Pty Ltd was inadequate.

Just the consent of Keijing Liu was provided.

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Evidence that he was authorised to give consent on behalf of the company will need to be provided to the commission. This would include whether he was authorised to do so without joint consent by second director Xiaojun Hu, or whether there was only one director at the time consent was given.

Ms Cunningham said several representors also raised concerns over alleged breaches of the Corporations Act, with discrepancies in company names and title references.

"The Commission considers these discrepancies can be characterised as typographical in nature and do not go to the question of land owner consent," she wrote.

Profits from the $140 million dollar development would flow overseas, according to an economic analysis by SGS Economics.

However, the development would have major economic impacts for both the East Coast and the rest of the state.

The report said once fully operational, the development would increase visitor spending on the East Coast by up to $39 million.

The development at Dolphin Sands would include 139 villas and units at the Cambria Homestead Precinct, 161 units and villas along the river, an 80-unit health retreat, golf course, 20 accommodation units at the golf range, and a 150-room resort.

It would also include community meeting and entertainment facilities, crematoria and cemeteries, educational and occasional care, boating, sport and recreation facilities.

More information can be viewed on the iPlan website.