The Real Estates Agents licensing board has banned Ning Kun Yuan (Aken Yuan) from acting as a real estate agent for a year.
He worked at Barfoot & Thompson's New Lynn office.
The institute had sought his interim suspension and said he accepted liability but sought to be heard before the board.
Misconduct concerned his use of two documents: a listing agreement and a valuation.
He signed the agreement for the vendor but failed to explain he had the vendor's authority to do so, the institute said.