Addendum... unless it’s the Parkstraße or the Liebentaler Weg, I wouldn’t see a reason to pay 50 euros/sqm in Liebental. Maybe if it’s immediately around the two city lakes, otherwise the land value per sqm ranges from 6! (no typo) to a maximum of 38 euros. I find a more than 20% surcharge already significant.
The problem could really be that you live in the middle of nowhere.
But I am fascinated how the OP says only 40 minutes to Berlin... it’s probably only to the Berlin city limits. And I’m surprised how cheap it is there. Within a 50km radius of Cologne or Düsseldorf you can’t get anything for that price at all.
But on Google there is a scientific paper about "Modell regionaler Lageeinflüsse auf den Wert von Grund und Boden", published in 2005 but still with DM data, coincidentally this district north of Berlin with Liebenwalde. Then you can understand it well.
But I stick to my point: Somehow the argument doesn’t hold, as land value is right pocket, left pocket, unless overpriced.