320 full luxury palaces on elevated ground in a city of 86260 people, built on a custom map. It is stable without intervention for over 20 years. Its design (from kicking ideas around onward) and construction are described in the Caesar III: Game Help forum thread "Century of Palaces Club" starting around reply #169.
Non-food goods use just-in-time inventory. In the save, the 4 warehouses contain a total of 4 pottery, 6 furniture, 6 oil, 6 wine, and 16 marble.
In each 1/16 month, 2 raw material cart pushers, 2 workshop cart pushers, either 12 or 16 school children, at most 2 market traders, and at most 1 lion or gladiator appear. The raw material and workshop cart pushers which appear at the same time are in the same non-food goods supply area. (The appearance of other walkers, especially food cart pushers, varies considerably.)