Duluth, MN (NNCNOW.com) --- The fire at a historic Duluth building is a result of arson, according to the Duluth fire and police departments.
The Duluth Fire Department responded to the Oliver. G Traphagen House on East Superior Street just before 1 a.m. Monday.
It caused an estimated $150,000 dollars in damage.
Firefighters say the fire spread to the second floor, but they were able to contain it before it spread to the third floor.
Meanwhile, authorities say an apparent Molotov cocktail was found in the building across the street from the mansion on Monday morning.
When Frank Messina, owner of Real Living Messina & Associates walked into work, he said he found the device surrounded by broken glass on the basement floor.
He described the device as a beer bottle with solvent and a wick.
He said he believed the wick failed to ignite when the person threw it through the window.
It’s unclear if there is a connection between the two cases, according to authorities on Tuesday.
Anyone with any information is asked to call 1-800-723-2020.
Tips can also be left with Duluth Police Officer Gregg McCullough 730-5472.
Rewards are being offered for any information leading to an arrest.
The Oliver. G Traphagen House is named after an American Architect who designed a number of buildings during the 19th century.
The redstone is home to HTK Marketing.
No one was in the building when the blaze broke out.