If you want to charge such exorbitant prices for your flats, at least build them properly.
Check the flats (apartments) in Seoul and Tokyo. They are built to within earthquakes and weather changes from – 10°c to 40°c and some are still cheaper than subsidised 4 room flats when new.
How many of us paid so much of their life savings and end up getting trashy apartments that need repairs and maintenance shortly after getting keys?