MILLMUNNSEGUK Skoolaborato

I am running a project at my school to build a virtual school in skoolaborate. The group I am in does not own the land but we keep getting foreign builds that we really need to get rid. I have sent all the owners of the prims illegal property notices but no-one is responding. If there is no way to get rid of them, does anyone know how I could cover them without spoiling the view? Thanks.