A Revere attorney and his two businesses have been ordered to pay more than $625,000 for targeting homeowners with deceptive advertisements and demanding thousands in illegal advance fees for mortgage modification and foreclosure relief services they failed to deliver, Attorney General Maura Healey announced Friday.

The court found that David Zak and his businesses, Zak Law Offices P.C. and Loan Modification Group Inc., preyed upon at-risk homeowners throughout the state and took unlawful advance fees based on deceptive guarantees that mortgage loans could be modified to prevent foreclosures.

“At a time when homeowners were struggling to afford their mortgages, this attorney abused his clients’ trust and deliberately exploited their financial circumstances by demanding exorbitant fees based on false promises, leaving these homeowners even more vulnerable,” Healey said in a statement. “This judgment puts an end to these deceptive and unfair practices and confirms that those who seek to capitalize on the foreclosure crisis will be held accountable.”

The court found the defendants targeted Spanish and Portuguese-speaking homeowners with misleading radio advertisements guaranteeing dramatic loan modifications and legal representation to avoid foreclosure. The defendants failed to disclose in the advertisements that there was no guarantee of success, when in fact they had failed to obtain the promised modifications for most of their clients.