One way to find out Select everything inside the building, copy it, load your map, and paste it. I would imagine if you did copy it, you would need to apply all the textures to the walls and floors etc.
What you can do is the next, on the right side of the screen you have the Buildings in the "Lines-Only" window.
Try selecting the building there and copy it from that place.
Then Paste it in your map > Now everything you'll see are just lines > Go to the Top and go to BUILD then click on BUILD all and the building should build.
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