Detroit has quite a group of early 20th century office buildings, that didn't get destroyed in the 60s. And a few very modern ones like Renaissance Plaza and the Compuware building.

In partcular go into the lobby of the Guardian Building, 500 Griswold Ave.

Very helpful to appreciate them was a walking tour by the non-profit Preservation Wayne:

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(It's Wayne County, named after Revolutionary War General "Mad" Anthony Wayne.)