Kevin Young and his company, The Investors Club, announced that they have started proceedings in the Supreme Court of NSW.
They are seeking preliminary discovery from Neil Jenman and the Neil Jenman Group so they can decide whether a legal settlement deed from 2011 has been breached.
This marks the latest chapter in an ongoing battle between Mr Young and Mr Jenman.
In 2009, Mr Young and The Investors Club sued Mr Jenman for defamation, with the parties agreeing a settlement in 2011.
According to Mr Young’s representatives, Mr Jenman agreed not to publish any material about Mr Young or The Property Club without first giving them a chance to respond.
They claim that Mr Jenman breached this agreement in August and September 2014 by allegedly publishing information on Twitter about Mr Young and The Investors Club without first informing them.
Mr Young and The Investors Club now want the Supreme Court to order Mr Jenman to hand over various documents so they can decide whether the 2011 settlement has been breached.
Real Estate Business contacted Mr Jenman for comment, but he had not replied by publication deadline.
Mr Young founded The Property Club in 1995 and claims to have a personal fortune of more than $200 million.
The company claims that its Property Millionaries Club has more than 4,000 members.
According to a news.com.au report from September 2014, The Property Club is being investigated by the Queensland Office of Fair Trading, although Mr Young denies any wrongdoing.
[Related: Jenman slams property spruikers]