I would like to thank you again for the answers. Simply by participating in the thread, aspects are mentioned and discussed that precisely answer the questions I am asking myself.
The probability is 0%. The hurdles are extremely high, besides you "only" lose the land and house (regardless of the legal form) against payment of the market value. So no financial loss.
By the way, highways or train routes are not simply built through residential areas in cities and municipalities.
Of course, I am very grateful for this answer. However, I find your assessment of 0% somewhat unrealistic. Furthermore, in the following sentence you mention that then "only" land and house are lost.
Excuse me? What else do I have on my land with house, which doesn’t even include the treasure chest with gold coins Tassimat mentioned.
I would like to refer you to your last question
What do you actually want? Build, buy, satisfy curiosity
Referring to the first post here in the topic; the goal is long-term information acquisition so that a property purchase without leasehold with subsequent construction of a multi-family house is possible with as little risk as possible.
Solution approach: move 50 km away and buy
Thank you very much for the answer. I have also thought about that. I would even accept the extra travel time. However, from the posts I read I can immediately derive the following connection:
Further away and rather undeveloped = cheaper but higher risk regarding new development (and maybe even expropriation?)
Closer to the center = more expensive, but (supposedly) higher security against expropriation and new development.
Best regards
Alwayssearchin