For me 45, but probably not classified as building land (Boris-BW, current status)
For me it looks like this, I think it really depends on where you are on the map. It fluctuates a lot.
From yesterday to today it has also changed to 170:
Edit: In view of the BRW, I would also reject the private offer at €450.
Unless there is a compelling reason to pay that price?
I know that a few years ago it was common to buy land prices far above the standard land value.
Given the current interest and construction cost situation, I would think carefully about that.