Minneapolis Thanksgiving Day fire

The Northwestern National Bank Building was built in 1930 by the architecture firm of Graham, Anderson, Probst & White.[3] The building was a 16-story, 264-foot (80 m) tall steel and concrete structure. The building had an open atrium through the upper floors, which acted as a chimney for the fire. Those upper 11-12 stories of the building were gutted by the fire. The bank vaults and safe deposit boxes, located in the basement and sub-basements, were undamaged in the fire, though they could not be reached and opened for several days.

Due to the severe damage to the structure resulting from the fire, it was imploded on March 11, 1984 to make way for the Norwest Center.

The JCPenney's and IDS Tower buildings on adjacent blocks were connected by skyways, but firefighters were able to contain the fire and prevent it from reaching these buildings. Smoke penetrated into them, and some windows burst from the heat, though they escaped serious damage.

Damages to the Donaldsons/Norwest block from the fire were estimated at $90 - $100 million, a jaw-dropping amount—about the same as the total of all fire damages in the city for the previous 15–20 years.[4] The City budget was stressed by the heavy costs for firefighters and police called to the fire, and later costs to repair the street around the block. At its peak, 85% of the Minneapolis Fire Department was battling this blaze, and fire crews from St. Paul and the Minneapolis–Saint Paul International Airport were called in to staff emptied fire stations around the city.

In 1949, Northwestern National Bank constructed a 157-foot (48 m) high weatherball atop the bank building.[5] The weatherball became such an icon that the bank even incorporated it into its advertising and logo for a time. After the Thanksgiving Day Fire and before the building was imploded, the weatherball was dismantled and stored at the Minnesota State Fairgrounds. The weatherball was never restored and, in 2000, it was scrapped.[6]