Purchase "building plot" price negotiations

Where is north? Is the blue the building boundary?

You have oriented the map correctly. And yes, the blue line is the building boundary.

Then the development is approximately 60 m.

What is that where the contour lines have such a wave? It is very unusual?

Yep

Then the development is about 60 m.

that's how it is. Not really nice.

It should work more or less like this with a basement/ basement level.



Is 14*8m possibly also okay? Are terrain modifications allowed?

maybe 14*8m also possible

Great. Good sketch.
We are probably restricted to 10 x 11 m. But that would have to be clarified in detail with the building authority.
We would then try to plan with a basement and accommodate children's rooms and a small bathroom there. Having the garage downstairs will probably be too tight.

I have seen some elongated buildings.

Garage and basement at 170m ground floor then at 173m

The driveway to the garage then has a 10% incline.

Otherwise a great piece of land.