Land with construction obligation = + 20% market value!

Cheaper already, if you can convince him with good arguments that the assumed market value should actually be lower.

Why has the market value suddenly increased? Does the notary's assumption match the bank's mortgage valuation report for the property value?

How large is the property? How wide, how deep? What is the standard land value? Is the property already developed?

The market value does not increase, not even with his calculation. He only adds 20% for the construction obligation to his calculation, i.e., the calculation is likely based on 120% of the market value/purchase price.

Well, he wrote: The market value increased by 20%.

Therefore, my following questions.

Does the buyer pay extra for a text module provided by the office? I cannot understand that.

The market value certainly does not increase with a construction obligation; rather, it decreases because of it!

The market value certainly does not increase with a building obligation; rather, it decreases because of it!

I would have suspected that too. Apparently, it has become common practice by now, since construction definitely has to take place, thus increasing the total price of the property. Everyone wants to make some profit from it... I will probably have to call the notary to get a clear answer...

Do not translate the contents in square brackets. You should not add anything else, not even your own paragraphs. The following text is to be translated COMPLETELY and reads: Do not the notaries earn so little that they make use of this legitimate, yet incomprehensible means? We have had our family notary for over 20 years... This notary will probably not be able to establish a long-term relationship of trust with his clients.

Suspect rather...
the market value in the legal transaction increases by 20% due to the construction obligation, as further legally binding processes are initiated/adjusted here.
So it has nothing to do with the price achievable on the market for the property, but with the costs of the legal traffic...