The landlord and a maintenance person for the Cicero building that burned down last month, killing seven, are being question by authorities, according to sources.
The assistant state's attorney and police investigators are questioning both men, but no charges have been filed, sources say.
The landlord and maintenance worker are the latest of several people questioned in the fire.
The lack of 911 calls from the building, and the fire's rapid spread, has lead investigators to question whether the fire had been smoldering for hours or an intentionally set blaze.
Whatever the fire's origin, investigators say there are definitely fire code violations in the building because so many who died were allowed to live and sleep in the attic with only one way out.
"I know there's a file about three inches thick, so we're checking it out today with the town attorneys," village president Larry Dominick said. "I'm hoping that if the same problem exists anywhere else, people would call up and say,'Hey, there's 20 people living here, or 30 people,' so we don't have the same tragedy again."