What do you mean by legal changes? How they would do it is up to Fdev. No reason why that as soon as changes occur they get update online straight away. Other commanders in the instanced area would see the station get updated. It may even have a building animation.Until you want to change something, this being an online-game, the server would have to check for "legal" changes. I think these would only happen during the weekly downtime (at least at that point, nobody could get synchronisation issues).