The three alarm fire that destroyed four Greenwood businesses and damaged two others was set by an unknown suspect in the Green Bean Coffee House, according to the Seattle Fire Department.

Seattle Fire Investigators completed the investigation Oct. 29 into the Oct. 23 fire and have ruled it arson, according to the Fire Department.

According to the department, damage is estimated at $2 million, which includes damage to the building and the contents of the four businesses - Pho Tic Tac, the Green Bean Coffee House, C.C.Teriyaki Wok and Szechuan Bistro - housed within it.

The neighboring Taproot Theatre and Greenwood Academy of Hair received mostly smoke and water damage.

About 100 firefighters battled the blaze for nearly 2.5 hours, said Fire Department spokesperson Dana Vander Houwen. The blaze was so intense that the firefighters had to fight it "defensively" outside of the buildings, she said.

Donations to the Greenwood businesses may be made through the Greenwood Fire Relief Fund at Chase Bank at North 85th Street and Greenwood Avenue.