Perth Lord Mayor Lisa Scaffidi has been disqualified from holding office for 18 months for failing to disclose gifts and travel but her lawyer will seek to put a hold on the penalty.
The State Administrative Tribunal in May found Ms Scaffidi had breached the Local Government Act 45 times by not disclosing accommodation and travel gifts, including a BHP Billiton-funded $US36,000 package to the Beijing Olympics, which was one of five breaches she admitted.
Ms Scaffidi did not appear at the SAT on Monday when the penalty was handed down but in May she lodged documents with the WA Court of Appeal against the tribunal's findings.
Her lawyer Steven Penglis told reporters outside the tribunal that he had instructions to apply for a stay of the penalty decision.
"That application will be filed today or tomorrow, and hopefully heard by the Court of Appeal before Thursday," he said.
"This is a unique situation, it's one without precedent really, but we'll wait and see what the Court of Appeal has to say."
Action was taken in the SAT after omissions in Ms Scaffidi's 2008-09 annual return were deemed serious misconduct by the Corruption and Crime Commission in 2015.
The tribunal also examined her 2013-14 return at a hearing in February, where she admitted five breaches of the Local Government Act.
Premier Mark McGowan has repeatedly called for Ms Scaffidi to resign, while opposition leader Mike Nahan has also said her position is untenable.