A week after a fire destroyed a warehouse storage facility in Brooklyn, a lawyer who says he lost files is suing the city for $20 million.

Robert Vilensky says he lost hundreds of boxes of files in the seven alarm fire. He also says the fire department failed to put out all the embers from the initial fire that broke out before they left the scene.

Firefighters had to return to the building to fight a second fire two hours later when documents inside the warehouse accelerated the flames.

The lawyer represented victims of the 2013 Metro-North Bronx derailment and last year's Harlem gas explosion. He says he lost the records of certain clients in the fire that he is required to keep for seven years.

It took nearly a week and hundreds of firefighters to put out the fire. The city says it will review Vilensky’s claim.

Sources tell NY1 the city will provide free credit monitoring for people whose records stored at the facility may have been affected.