Buick City

The final phase of the integrated car assembly and metal stamping production at Buick Motor Division's former headquarters. Idled and tore down in 1999.

Or, alternatively, the entire production site that included axles, springs, motors, etc. (pretty much the entire car).

Also adopted by Flint, Michigan as a nickname because Buick and General Motors were created there.

To anyone outside of Flint, "Buick City" means Flint.
To anyone who lives in Flint, "Buick City" means the Buick site.
To anyone who works at "The Buick", "Buick City" meant the vehicle assembly and metal fabrication operations.