House prices have risen just as much, if not even more, than stocks. Thanks to falling interest rates. Every run-down property has increased in value; you couldn't go wrong. Tips like buying an entry-level property ("Zwischenhaus") and later building a bigger one worked as well. That won't work in the coming years.
The thing is, if I amortize over 30 years, I do have forced savings, but there is no interest on it. You are only subject to the general real estate market development. It can increase in value or fall. It's a gamble like stocks. If you don't invest, you just let a house deteriorate.