On Thursday afternoon July 19th, a F3 tornado struck Lennox International, severely damaging the Marshalltown, Iowa factory. This clip shows the office portion of the factory on the west side of the property. I'm told these offices were constructed in the 1920s and in later decades. You can see the damage to the offices as well as some of the factory collapse.
As of July 30th Lennox has pledged to rebuild the factory and donate $500,000 to the city of Marshalltown for cleanup and restoration efforts.