Westfield is apparently looking to build up to 1500 apartments on top of Warringah Mall (near Manly): https://www.youtube.com/watch?v=GWBiF7YJvYA #auspol #nswpol #urbanism
Westfield also wants to put apartments above its shopping centres at Parramatta, Hornsby, and Eastgardens.
Personally, I think as long as there's proper noise proofing, apartments above shopping centres makes a lot of sense.
For residents, it's convenient to just go downstairs to pick something up from Woolies, Kmart, or the food court.
For the broader community, it saves a lot of car trips and reduces traffic, because the folks who live above shopping centres probably aren't driving there.
And at least in Sydney, many shopping centres are in central locations close to public transport.
Westfield Parramatta in particular is in an ideal spot for more apartments. And Hornsby's CBD is rapidly densifying too.
The only issue with Warringah Mall, other than the lack of trains, is the infamous NIMBYism of the locals.
But in general, I think it's a fantastic idea.