Arnolds Park/Okoboji Fire and Rescue crews are working with the State Fire Marshall's Office to determined the cause massive structure fire Monday afternoon.
Firefighters were dispatched at 3:05 p.m. to 184 Park Place just southwest of the Central Emporium. Flames were already coming through the roof of an attached garage at 184 Park Place in Arnolds Park by the time rescue crews arrived. The blaze was causing damage to second home, at 180 Park Place, as well.