This.
Change the game. We can't let our city dwellings become financial assets for investors at the cost of urgently needed housing for local workers/residence. Short term - get these poor people emergency/temp accommodation, long-term - look at Gov schemes that utilise empty 'cash cow'...
Good idea. Just worried about those tax dollars not going towards social housing. Maybe a combo of the two options for investors, and not just foreign investors.
Change the rules on foreign/domestic investment on non-residential properties. If you want a sitting investment in the best city on the planet that has serious housing problems then you will abide by those rules. One way would be for non-habited investment properties to be "looked after" by...