How the mighty have fallen.

Former National Arts Club head Aldon James says he’s been stripped of his key to Gramercy Park.

James — who was in court yesterday trying to fend off a disciplinary procedure that could see him booted from the storied park — shook his head “no” when Justice Carol Edmead asked him if he still had his key.

The eccentric ex-Arts Club president is facing bigger problems — his handling of the organization’s finances is under inves-tigation by the Manhattan District Attorney’s Office and the state Attorney General’s Office.

James declined comment after leaving court.