Valuation of farmland for development into building land

And he then sells the land for at least €380/m². Of course I want to have a share of that. When you see land to the right and left is sold for €300-600/m². Then it's not unreasonable to throw €280/m² into the room.

Yes, it is. He buys 10,000 sqm at €280 = €2.8 million. Then he invests another €2 million for development. Afterwards, he can sell 6,000 sqm as building land – the rest goes to the city as roads, etc. Great business: He spends €4.8 million to then get, let's say, €500/sqm on average. So €3 million. Thus, €1.8 million loss for three years of work. Yes, it is unreasonable. If he calculates with €50/sqm, a profit of €500,000 remains. That is 20% on his total costs. Not generous for three years of work and the risk that it turns out differently in the end.

I agree with you. But if he doesn’t own the property, I don’t think he would get a building permit. He can’t just build around my property. Then he wouldn’t get a permit.

And both parties lose a lot of money...

And he then sells the land for at least €380/m².

Yes, because, as already mentioned, e.g. €200/m² must be invested by the investor so that farmland can become building land.

And if he doesn't rely on it now, he has already made a loss deal. What he pays the others is... I have the smallest piece of land of all and everyone wants to make capital out of it.
If that is the case, I won't give it up.
A farmer has the largest piece of land, he can offset mine with his.

If that's the case, I won't give it up.

Stubborn. You can make real money, but you just let others do it.

I understand that, as I already wrote above. He is allowed to earn something, it just has to be distributed fairly.