When I close or demolish an upgrade, any ploppable unlocked by that addon is automatically closed as well. Will the same thing happen to other cities in the region? I don't want to accidentally troll other cities if I decided to shut down upgrades I don't need anymore.
SimCity 2013 – Effects of Demolishing City Hall Upgrades and HQs
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It may still be a server issue, even my private game with no external players is not syncing instantly like it should. Townhall addons when placed apply to the region automatically same goes for the HQ for specializations (usually), there is nothing more that you need to do
1) First of all there's no sewage return, I know that for sure. Second, the numbers of "regional resources" are slow to update (maybe once a month?) so snap testing is hard to do. I did turn off my water supply to see what would happen. I am sure Power works in the exact same way as Water as far as the Arcology is concerned, but I did not test Power independently. Also, note it seems the Arcology caps out at 1,000 power and 1,000 water in Regional Resources (meaning it only 'sees' up to that point).
The water or power required to run the Arcology MUST be "available to trade" and not in use. It isn't "sent" (or listed anywhere) to the Arcology but the region has have atleast 120 kgal/hr "available to trade" in order to keep Arcology running.
2) I know in order to get the Arcology "activated" and fully built I had to visit each city in my region, so they obviously have some sort of internal clock whether it's built or not AND whether it's functioning. However, switching between all my cities the "Regional Resources" of the Arcology remained the same.
Basically, while you are playing each city its that city's knowledge of available regional resources when its turned "on" and when its got enough resources to function.
As you can see my water producing city doesn't show any water being sent to the Great Work, but it has more than enough "available for sale".
Hope this cleared some stuff up for you!
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OK, since nobody has an answer, I tried it out myself in a private region.
Turning off addons did not affect the other city in the region, although it could be due to the region propagation delay. I'll check again tomorrow and see if anything's changed. I would imagine it's by design so one city shutting down or bulldozing everything doesn't wreak havoc on the region.
Also, only some buildings are shut down when I turn off the prereq. For the Dept of Safety, the Hospital will stay open while Fire and Police stations shut down.
For Dept of Tourism, Landmarks were still unlocked but big parks were not.
Looks like all the specialization unlocks stay after you close the HQs too.
Don't know if these are bugs or not, but right now you can save some $ per hour while keeping the bonus services.
Also, unlocks do not go across the entire region in the 16-city maps. They only go as far as the 4-city subregion.
Wish I could test this from sandbox mode, but everything is unlocked there from the get go.