Interesting link, thank you.
You see right there the problem with real estate and blockchain. You need to sign a paper contract and the asset is not tokenized but you are the one owning the property.
In my case the Genossenschaft owns the property and therefore they sign the deed.
As a tokenholder you don't own the property but a part of the organisation owning the property.
Additionally, the token gives you all the benefits of owning real estate (steady returns and a quite secure asset) without the hassle of buying and owning real estate.