Wait what? There's a lot there, tell us more. Why do they rebuild every 30 years?
In Japan, the real estate system is designed to ensure affordability of homes.
In Australia, the real estate system is designed to encourage and maximise real estate investment as a no-effort wealth multiplier for (literal) rent-seekers. See for example the policy of "negative gearing" where the tax system subsidises those buying investment properties. Those that took advantage are such a powerful block that no politician of any stripe has the gumption to sunset this policy.