CHICAGO (AP) — A law firm headed by one of Chicago’s most powerful Democrats has helped Republican presidential front runner Donald Trump and investors in his luxury downtown hotel receive nearly $12 million in property tax breaks.

A review of city tax records by the Chicago Sun-Times found that the law firm of Klafter & Burke helped the hotel and other occupants of the 92-story skyscraper earn a total of $11.7 million in tax reductions in six of seven years.

Alderman Edward M. Burke’s firm is now trying to get partial refunds of those taxes, filing appeals in court and to a state agency that the amounts paid were too high in some years.

Trump didn’t respond to questions about how his use of the property tax lawyer. Burke declined to comment.