After Ambitions came out, I started a fresh Sunset Valley and then lovingly and carefully moved around a few houses to make room for better placement of the Ambitions lots, which I incorporated into existing sidewalks, etc. Believing this to be the original Sunset Valley with only the Ambitions lots added, I saved this version of Sunset Valley to be my Ambitions template for all new SV games.
Just now, I was playing around there, to build a new house when I noticed that the Modernhaus was not in its original form, but in the improved-upon form that one of my sims in a different Sunset Valley had made. This makes me wonder whether this is a story-progressed town too, or what the heck is going on.
I would greatly appreciate an experienced view of what's happening here. I'm not acquainted enough with possibilities and impossibilities to draw any conclusions.
Many thanks!