Here's what we know, so far:
The interior of the main building at the former McLouth Steel is being used for a television production for ESPN's Saturday Night Football, according to Trenton City Administrator Jim Wagner.
The reader said he was driving to work at about 9:30 p.m. Wednesday and "noticed in the south end of the old McLouth Steel building there were concert lights on inside."
Wagner said Havana Productions of Tampa, FL was filming a promotional commercial for ESPN.
We aren't sure why the lights inside the building appeared to be concert lights, but we have placed a call out to Havana Avenue in Tampa, FL to find out more information.
A representative of Havana Avenue said the production company was not working on a production in Michigan Thursday night.
Look to Trenton-Grosse Ile Patch for more on this story.
*This article was updated at 5:35 p.m. Thursday, Sept. 5.