The Independent Commission Against Corruption has previously heard that Mr Maguire would gain up to a $1 million fee if the same property was sold.

Former parliamentary liaison officer Jock Sowter told ICAC yesterday that he was instructed to meet Mr Maguire and Louise Raedler-Waterhouse "towards the end of 2017" after he asked to see then-Roads Minister Melinda Pavey.

Mr Sowter said Mr Maguire told him "This is Louise Waterhouse. She has a problem. Can you assist?".

Mr Sowter said she wanted to "move an intersection" so her "land would be developable" and he was handed a "large glossy brochure".

Mr Sowter said he got no indication Mr Maguire had a financial interest in the issue and Ms Raedler-Waterhouse introduced herself as the consul-general for Tonga.

He said he passed Ms Waterhouse's request on to Roads and Maritime Services for advice and was told the department would not facilitate her proposal.

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When Mr Sowter passed this information back to Mr Maguire, the former MP emailed him back and told him to go back and get different advice otherwise the land would be "undevelopable."

Mr Sowter told ICAC he was "perplexed" by the response.

"You never get a response like that," he said.

"He wanted us to do something that wasn't going to happen."