Ficitonarchitect, do you have a copy of the Development Consent on your building? In our case it is quite clear that nothing such as this can be attached to windows:
“All external glazing in the development must be clear and untinted.”
Check that first. If you are in luck, ask the Strata Manager to write to the Owner seeking that their tenant complies with the DA on the property, or the matter could be referred to Council.