It is understood that at the time of the sale Wallace was suspended from working as a real estate agent. According to court documents, that suspension only lapsed on June 18.
Wallace, who lives at her mother's Pokeno farm, was released on police bail after she was charged on Wednesday, and ordered to appear in the Pukekohe District Court next week. She refused to speak about the charges yesterday.
Police allege Wallace defrauded multiple victims "while acting as a real estate agent".
"In one of the cases, an overseas couple paid a large sum of money on a Clevedon property that was not for sale," Detective Senior Sergeant Aaron Proctor said.
The Germans were aware of the arrest but did not want to speak publicly about the case while it was ongoing.
The charges are a new chapter in a series of legal problems for Wallace. In February, she was declared bankrupt in the High Court at Auckland.
In December, the Real Estate Agents Disciplinary Tribunal suspended her for 18 months after finding her guilty on misconduct charges - unlicensed trading, putting undue pressure on vendors over a commission agreement and selling a carpark she did not own at Princes Wharf.
Describing Wallace's conduct as "seriously incompetent or negligent", the tribunal considered banning her permanently by cancelling her licence, but instead decided on the suspension.
"We observed that she is very distressed by these charges having been proved and does not seem to accept guilt," its decision stated.
"Indeed, she maintains that she always acted in good faith one way or another and that she was always giving of her very best efforts to the customers involved in each charge and often at quite some personal inconvenience to herself."