The Independent Commission Against Corruption (ICAC) on Tuesday played intercepted phone calls between Mr Maguire and horse racing heir Louise Raedler-Waterhouse, about using the premier's private email address to avoid Freedom of Information requests.

During the call, Mr Maguire advised against mentioning his name in an email because "the fact is all that stuff is ICAC-able".

"What address do I send it to?" Mr Raedler-Waterhouse asked Mr Maguire in the call on November 14, 2017, which concerned a proposed letter to NSW Premier Gladys Berejiklian.

Mr Maguire gave her an email address that would "go directly" to the Premier concerning people who were "getting in your way".

"I don't want to be in Freedom of Information or whatever," Ms Raedler-Waterhouse replied.

Mr Maguire then said "just send it directly to her personal one". Ms Raedler-Waterhouse told ICAC on Tuesday "I don't know" when asked why she did not want her email to be subject to FOI.

Ms Raedler-Waterhouse said she viewed Mr Maguire's comments about ICAC as "silly talk" and "not impropriety". She said emailing the Premier was "a bit cheeky" and was "pleased to get direct access", but got no formal response.

ICAC is investigating allegations that Mr Maguire used his public office for personal gain between 2012 and 2018.

Ms Raedler-Waterhouse denied asking for Mr Maguire to be "looked after financially" from the land sale, but agreed she would have paid property agent William Luong at least $6.9 million in fees if he secured a $330 million price.

Mr Luong has told ICAC he would have paid Mr Maguire at least $690,000 if the deal had gone through, and better road access and zoning would have increased the land value.

Ms Raedler-Waterhouse said she considered the prospect of a successful sale to be "dead" by September 2017.

Ms Raedler-Waterhouse said "not to my recollection" when asked if she gave Mr Maguire any implication he would benefit from assisting her and that he told her he "liked helping people".

ICAC Assistant Commissioner Ruth McColl asked about Mr Maguire's suggestion that the NSW Premier would give a "tickle from the top" meant putting pressure on ministers.

Ms Raedler-Waterhouse said pressure was "a bit strong ... I was wanting to draw her attention" and she was also representing nearby landowners on the issue.