Property purchase & broker behavior: Is this normal?

What still worries me is the question of what dangers exist for us in a mixed-use area? Regarding noise & co.

Since you are not allowed to copy longer texts from other sites unchanged here (I recently received a warning for that ;-) ), I recommend you to google what is allowed in mixed-use areas. There are very detailed regulations, including specifications on noise levels etc. What I can say is that the businesses located in a mixed-use area must not significantly disturb the residential living. That would personally reassure me. In fact, I find mixed-use areas even more pleasant than purely residential areas because there can also be small shops, bakeries (no huge factories for baked goods) etc.

Addendum: Shops selling magazines, hairdressers, podiatry, physiotherapy, etc. are also possible in a mixed-use area.

I also think it's good. But it's just a village street that the commuters use. Everything has its pros and cons. For example, a bakery also has the annoying noise of engines starting in the morning when everyone is still picking up their bread roll on the way to work.

We have now, after extensive research, found old real estate listings for the mentioned property. Apparently, it was already offered for sale in spring 2020 and was probably sold then (we were told that the heir sold it and the person who bought it changed their mind). The listed price ("back then"), the focus of the old listing was not solely on the plot but on the house including the plot. The selling price was €323,000. This would imply an increase in value of €100,000 for the property or both. With the €323,000, we are also significantly closer to the standard land value. That is indeed very business-minded. Should such information be included in the price negotiation? If yes, how? Really mention that you are aware of these listings? We think the plot is great, and now for the first time have seen pictures in the listing in sunlight (that really makes a difference when not everything is gray and bare :D) - but €100,000 (or maybe even more, who really knows if it actually went for €323,000) more than in April... that's quite steep!

We have now, after extensive research, found old real estate ads for the mentioned plot of land.

You did well.

The selling price was €323,000.
This is supposed to mean that the plot of land or both have increased in value by €100,000.

If you want to increase the probability of a sale, you can create the impression through a high price that it is worth more (than it was after a previous sale). Not that I could quote a Bible verse on this, but I am quite sure that Methuselah's grandpa already knew this trick ;-)

You are probably right

Those sly devils!