The Weekend Herald revealed last month that the city's biggest real estate firm later made financial settlements to the two original vendors totaling about $150,000 and helped negotiate a $55,000 discount for an aggrieved investor.
Hughes and fellow Papatoetoe branch agent Kymm Hape were both given final warnings in late 2014, while their then manager Avind Lal was dismissed.
The REAA laid misconduct charges against Hughes and Lal, and a lesser charge of unsatisfactory conduct against Hape.
The trio admitted the charges at a Real Estate Agents Disciplinary Tribunal hearing in July and a penalty decision was issued by the tribunal today.
Hughes - who was dismissed by Barfoot earlier this year after the Weekend Herald revealed he had privately on-sold another property in Mt Wellington for a $725,000 profit - has now had his licence cancelled.
The tribunal said it had significant concerns about public safety and professional standards in relation to Hughes' conduct, which showed a serious breach of his obligations as an agent.
"He seems to have been more concerned with making a quick sale and two commissions than in discharging his fiduciary duty."
Hughes, who voluntarily surrendered his licence earlier this year, failed to market the properties, provide written appraisals or expose them to other Barfoot agents and potential buyers.
He did not ultimately receive commission money on either sale and his lawyer told the tribunal Hughes believed he was assisting the Fitzroy St vendors to avoid incurring marketing costs while obtaining a price they were happy with.
Hughes told the Herald tonight he never set out to be dishonest.
"There's huge regret around the way things have eventuated, but there was no intent to pull the wool over anyone's eyes."
Hughes said Lal had instigated the re-sale of Fitzroy St. He said he had no knowledge of the two Carlie St on-sales as he was overseas.
However, he understood how what happened could have caused distress and accepted the tribunal's decision.
The tribunal suspended Lal's licence for 10 months.
"He was actively involved in steps which maximised the profit for the agency but were contrary to the vendor's best interests. However, we consider that Mr Lal may be able to be rehabilitated and come back into the profession after the suspension."
Hape was censured, fined $3500 and ordered to undergo training for his role in the Carlie St transaction.
"This was a serious offence and given the original vendor was an elderly lady the potential for harm was very real."
The decision said Barfoot appeared to have done everything it could once issues with the Papatoetoe office emerged. This included replacing the manager to ensure proper supervision of agents, enforcing on-sale policies and liaising with the original vendors to "address the financial consequences of these transactions".
Barfoot director Peter Thompson told the Herald the penalties seemed appropriate.
"I would also point out the comments the REAA made in regard to our company, which was very pleasing, with the actions we took and compensation made to the affected parties."
71 Fitzroy St, Papatoetoe
Sold by Karlene and Mark Mager on July 21, 2014 for $660,000 to investor Gulab Singh Padam Singh Bisht.
On-sold on the same day by Bisht to investor Ramesh Rajini for $760,000.
14 Carlie St, Papatoetoe
Sold by David Hedge on behalf of his elderly widowed mother on September 11, 2014 for $630,000 to investor Gulab Singh Padam Singh Bisht.
On-sold privately by Bisht on September 15 or 16 for about $655,000 to WBP Ltd.
On-sold by WBP Ltd on September 22 for $725,000 to investor Anthony Bidesi, who later cancelled the deal.
