New South Wales
they do it at the same time.
Looking what others are doing isn't such a big deal to me.
I was asking because in my 2 player game my wife had the Immunity to event room. If I know this is the done she will build for free, I might want to build for free my room that lets me pay less resources to fight events... Since in a 2 player game, I'll be the only one fighting the events...
I guess we'll play that you can't look at people drew for rooms and which one they'll build for free...