Perhaps the cats need to be fed as there are no more Ibis. Once the cats are gone someone will need to feed the rats. Once the rats are gone you will have a splendid batch of cockroaches….
Sometimes you just need to take responsibility yourself if no one else will. Call those organisations today if you won’t or can’t catch the stray cats yourself to bring them yourself. Otherwise and unfortunately you may well have a dozen kittens to deal with also by the next GM. In 2 years you will have 50 feral cats irrespective of said resident feeding them or not.
A radical idea is to get the current ones neutered and then adopted by residents of the building. After all it’s not the cats fault.