Good game all.
The State Property benefit was really just because we had a north south world wrap and the distance upkeep costs were treating it as a cylindrical map, right?
So the AI could receive the same bonus if need be, and if our benefit from State Property was so great it was probably only because our capital was so far north and our first several conquests were on the south edge of the map, most of the AIs weren't as badly hurt by it as we were. If Moscow didn't have silver and gems to compensate we couldn't have pulled it off.
Or is there something else you mean by the state property benefit? I don't think we abused the food bonuses from that civic, even though I did, for example, turn a fur camp in Cuzco into a watermill post electricity and communism.