Many shopping malls are expanding. Two near me are Eastland at Ringwood and Knox City at Wantirna.
I used to work new Eastland and it was a nice little mall about 30 years ago. Today it is a jungle. I've only had to go there three or four times in the last year, and I have no idea where things are. I have to take my daughter as a guide. Knox City is pretty much the same.
My regular mall is Forest Hill Chase, and it is still fairly small. But there are about a dozen shops or more closed for renovations at any one time. They move around to renovated shops so you've got to hunt for what you want, but it's still only three levels. There is no indication of any extensions. One of the travelators has been under repair, promised "soon", since last Christmas.
Some stores, like the butcher, and JB Hi-Fi have left the mall and a few retail chains have gone into liquidation here and elsewhere (eg Rivers clothing and footwear). But new stores are moving in. KFC are about to open in the food mall, 20 metres from McDonalds, and a fourth audiologist/hearing aid shop is opening. There's a Coles, Woolworths, Aldi, and two Asian supermarkets.