I tried experimenting in singleplayer and couldn't figure this out.
here's an example of what i'm talking about
The little buildings on that baseplate were built by a player, and the terrain underneath is loaded as public. The issue is, if i was to save this, and reload it, i can only do it two ways. Load all the bricks as public, or load them with ownership, which makes the public bricks mine.
How do i load it so the public bricks stay public, but the player's bricks stay as his bricks?