The Bizarre Bazaar by bullseye8841, Inverurie by Neil Manke, Ghost Town by Roger Staines, City 2000 by Perro Seco, and QuakeCity by NCMark are other good city maps.
If you're willing to go beyond vanilla Quake, Ter Shibboleth Part 2 by ORL has a couple of huge city maps.
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I am using only vanilla: dos quake, winquake and glquake.
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