Sorry, misunderstanding - I didn't mean to doubt either calculation or eyesight
Unfortunately, I can't provide the pure house price at all, as it is a complete offer. But that is probably already the first important point, as we should probably ask about that...
Or he writes me the plot size and address, then I'll calculate... although the construction expert or the OP can also do that... take a look at Boris.Nrw
Not really - Boris is a retrospective and generally a benchmark for municipalities; the free market works differently.