(For the uninitiated, the government [and sponsored co-ops] owns almost half the housing in Vienna, and eligibility for social housing, which is seen as desirable, extends deep into the middle class.)
Many people also don't know that Vienna was isolated and divided for nearly 50 years during the cold war. A significant amount of the available housing is due to Vienna having a bad economy for almost a century.
I am also reminded of (former-?) rival Hong Kong, where the government either runs or subsidizes at least half the housing. (This in turn relies on other idiosyncrasies, like the government owning all the land, a massive sovereign-wealth fund, etc.)
In general, the Vienna model is very difficult to copy without being in extreme conditions: https://www.threads.com/@__smiz/post/Cxpz28CIkT6