What about prefabricated houses in post-communist countries? You definitely can't accuse them of using highest quality materials nor spending loads of money on maintenance, but I haven't heard about major failures and there are probably millions of such blocks of flats out there, built mostly between '60-'80 using a couple of different variations of the technology (some involving pre fabricated pieces of reinforced concrete connected with steel joints). I think they were estimated to last 50 years or so, but there is still large proportion of the population living in such houses in some countries nowadays.

Sorry, I only got curious and started looking into it after the condo collapse in Florida. Every reference I can find on the subject says 100 years is the max life span of reinforced concrete. Not being a structural engineer I took it at face value.