I spent the better part of the day trying to make an Inn that I could then prefab and quickly copy paste in any new adventure I would make.

This in an effort to find ways to decrease a GM workload in creating an environment.

However when I prefab my entire inn I get an amount of warning where I altered objects and these wouldn't be taken into the prefab. Fair enough, but then to my surprise the wall itself of the building wasn't in the prefab either.

So ... prefab is not the way to go. What is the best way to make a "library" of buildings that we can quickly copy paste in new levels ? My ultimate goal is making some kind of community library with structures in it , a jail, an inn, a barn, etc... Anything that will decrease adventure preparation for a GM