Detroit still has a few '20s parking garages. There's one currently being renovated at Cass and Lafayette and the former Fort Shelby garage that's now part of WDIV's building on Howard and First. There's also the garage in the First National Building, which I think was built in the '30s. The now-demolished garage at Clifford and Elizabeth was also built in the '20s.
Most older cities have a few remaining garages like these. I know there's at least one in downtown Youngstown and downtown Dayton, and plenty of other places.
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