Gulls have been a huge prob along the Yarra river, even on the helipads.
MCC mulls gulls as avian invasion mars AFL finals | MCG seasgull
There are enough river islands nearby for the bird's nests to be free from predators. Someone up north could bring in a few freshwater crocodiles to throw in the river, it'll even make the nearby rowing club row faster
.
There's always the nearby Governer General's back yard if things get serious, you may even get a cup of tea, so long as they are not sunbaking naked
(is it still notam'd off limits?).