You can't create/import a residential building larger than 4x4.
Any buildings that need more than 4x4 tiles must be imported as "unique building".
Then to make the building act as residential ingame, you need the mod Ploppable RICO.

Originally posted by Alexgazz:

You can't create/import a residential building larger than 4x4.
Any buildings that need more than 4x4 tiles must be imported as "unique building".
Then to make the building act as residential ingame, you need the mod Ploppable RICO.

Can I get more details? Rico does not load in the editor. How do I set up and save the object after?

In the editor just save your building as "unique building" and thats it, nothing more to do here.
Then enable Ploppable RICO in the content manager, restart the game and launch a map or savegame.
Now you will see a new icon
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188737896

Click it, then "settings"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738015

Here search for your building
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738155

Click "Add local"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738287

Edit the settings as you want then click "Save and apply changes"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188751412

Now your building will act as Residential
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738412

Originally posted by Alexgazz:

In the editor just save your building as "unique building" and thats it, nothing more to do here.
Then enable Ploppable RICO in the content manager, restart the game and launch a map or savegame.
Now you will see a new icon
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188737896

Click it, then "settings"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738015

Here search for your building
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738155

Click "Add local"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738287

Edit the settings as you want and Save
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188751412

Now your building will act as Residential
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3188738412

This is understandable. Will the file with the object itself be already with the rico settings that I created when exporting to steam?
I saw that some of them have rico settings in the folder with the crp file. Are they automatically created there?

The PloppableRICOdefinition.xml must be added manually where the .crp is.
Here a guide to learn more about RICO and to publish on the workshop
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=628080291