If the agenda hasn’t already been issued, add another motion calling for the work to be done only after other specific works is done first.
If the agenda has been issued, propose an amendment at the AGM that the work should only be completed when all other essential repairs and maintenance work that benefits the whole scheme has been carried out. Even better, get specific about outstanding work that needs to be done.
Or extend the proposal to include all other areas around the building, calling for quotes on the work before a final decision is made on this.
Amendments can be proposed that don’t alter the general intent of the original motion, so if the motion says “do this work” you can add provisions to having that work done.
At least doing it that way is less personal and more procedural.