Special resolutions can be overturned but they require 75 percent of those voting in person or by proxy AT THE MEETING.
However, if you can muster 25 percent of votes at the meeting to reject the motion, then you can stop it in its tracks (much easier to do at this stage because of the figures involved).
Not sure why they need a special resolution for a paint job – may be worth further investigation before you become Sydney’s second ‘rainbow’ building.