Just for a laugh, Just4alaugh, consider the following; the assertions above that the flag/s can sometimes be noisy, there are protocols which should be observed to do with flying the aussi flag and not everyone would agree that it’s OK under the Strata Titles Act and your building’s by-laws, or that it doesn't significantly changes the character of the building.
I suggest it probably needs to be approved by a Special Resolution at a general Meeting. Go for it and please DO keep us all informed.