Beforehand, I would speak with the municipality or building authority to see how the buildability looks. Whether there might be any restrictions.
Would you do that once I have the documents from the gentleman, or already before?
Everything about buildability has actually been said.
Regarding financing: The plot of land also counts as equity. However, if you lack possible reserves due to the cash purchase, finance the plot through a variable interest loan (terminable at any time). When you then do the house financing, increase the requirement by the outstanding balance of the variable loan. You can then repay it with that. This way, the financing bank could take first position.
Do everything beforehand.
The gentleman could be wrong too
Maybe someone remembers we had written here once before and had a bad experience with searching for a plot of land, and thanks to you we were quickly able to pinpoint what we need to pay attention to.
Do you know where the reason lies? Which postal code is that? In Bavaria, for example, you can look something like that up online.
Yes, very worth reading: