How are you trying to remove it? If using a map editor I would try to drag it under the map. Rather than trying to delete it. You may be deleting only the Textures off of it.
Are these props or part of the map? If they are props you gonna need to delete it from the object, otherwise if it’s just a prop I don’t really know how to.
I have a remodeled / custom interior that i’m going to have for that building and it is going to be a DOT station but then i need to remove all the props inside of the fence so i can use it for a tow yard