I think Singapore and Hong Kong deserve the first places as contrary to other countries, public housing plays a far greater role and encompasses the middle class, whereas in most countries public housing is only for the poor and lower class.
Generally I'd say Singapore, however, there are a few "public housing" type schemes in Sweden where the government builds them and lets them out on sub-market rates. The government company in Stockholm is called "Svenska Bostäder". You can see some of the stuff under construction right here. A new part of the Swedish ethos is to rather than ghettoise this kind of property, is to mix it with others. That is why there are very attractive SB properties in the middle of exclusive areas like Annedal or even Hammarby sjöstad where they even built student accommodation.
In many ways, this follows HDB where SB doesn't want to just be for poor people, but also to be more attractive for everyone too by building in good areas as well.
In last 30 years in Italy they did something similar. Instead of building public housing directly they gave authorization to private builders to build keeping part (or the whole) of the new buildings to sell at controlled prices or to let for public housing.
But substantially since '80s there were no more massive public housing interventions as in past decades.
Nowadys there is a new need for a massive public housing plan (since a decade at least) because of immigration. But nothing has happened still on national scale.
The tendence, anyway, is to build, unlike the past, public housing in a social mix context. With relatively little interventions and not whole boroughs as in the past
^^ I think where there is a difference here is that in Stockholm, the city council completely owns SB and builds properties directly as well as controlling the shops, facilities and all surroundings of the SB apartments. They mingle in with private apartments too, but the city is still very much in control.
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