SIOUX CITY, Iowa (AP) – The owners of a historic Sioux City building that dates to the 1930s are trying to determine how much can be salvaged after a weekend fire. The Sioux City Journal reports  the distinctive Normandy building sustained significant damage Saturday.

Fire officials haven’t been able to determine what caused the fire partly because it hasn’t been safe for inspectors to enter the building. Sioux City Fire Marshal Mark Aesoph says the roof will have to be removed before investigators can enter.

The white building with cone-shaped turrets was the longtime home of the Normandy Restaurant. It has also housed other businesses and in recent years, several art studios.