Hi,

How to remove these things ? ( Those buildings are not on a lot).

If they are caused by CC, removing that CC and clearing caches should get rid of them.
If they were not caused by CC, I think you would probably need to use CAW and get the world files for that world to get rid of them.

I think that this is actually a sign for already missing CC. My guess is the castle set from the Store.

But are you sure that these towers are not on a lot? I am not aware that one can build outside a lot, even in CAW. It may be a hidden lot (or hidden los) that can be made visible by typing "enablelotlocking on" into the cheat console after enabling testingcheats.

I have the castle set. I removed those cupboards of the towers placed on a lot ( the castle, the windmill, the soldiers barrack ).

Is that Praaven? Looks like you have some CC missing- there is a list here of what you need:
http://modthesims.info/showthread.php?t=488232
Make sure you have all of that CC installed and then start a new game in that world.

If you want to remove those items from an existing game you'd have to see if you can shift click on them in debug mode and choose object>Delete it.

If you want to edit the world to remove the CC, you'd need to open the world file in CAW:
http://modthesims.info/showthread.php?t=469942

Thanks it worked.

Yes, it's Praaven.. I have the castle set ( interior and exterior ) but some parts are still replaced by other stuff, like the big castle door, instead I have that bright red door, at least I can change them in building mode, because the big castle door is listed ( with the few other medieval doors ).

If you have the required items and they still get replaced by the game, then the only reason that I can think of why this is happening is that either you or the creator uses decrapified versions of these.

The doors are included in Praaven. I have also a package version of them.