Hello, first of all, thank you very much for all the answers.
So the property is being sold by BBF (Berlin Brandenburg Land Development) and mediated through a real estate company (without commission).
What we were told mainly concerns payment regulations that are vague or interpreted to the advantage of the seller, up to a power of attorney for the notary for up to 60 days after the transfer of ownership.
Furthermore, liability for material defects is directly excluded and reference is made to possibly old foundations, cables, and lines that might still lie there.
After the initial shock has passed, we will simply address the main issues with the notary and see if an agreement can be reached. As always, the seller naturally holds the stronger position, and after all, we want to purchase the property.
With the current construction boom, there are many lining up who say, "I’ll sign immediately, give me the property...."
Maybe we just reacted a bit too shocked.... thinking it over for a few days and then gaining clarity again to approach everything objectively is our current plan..