Boundary construction / boundary wall and property boundary

Hello,
regarding a property in the family, the question arose about the ownership of the cavity between two boundary walls. The walls are about 20 cm apart. In the plans known to me, this cavity is not marked; it is not obvious to which property this space belongs.

Who can provide binding information in such a case?
Is the Office for Land Management and Geoinformation responsible for this in Hesse?
No encumbrances are known – insofar as this is relevant here. What do you do if it ultimately cannot be clearly clarified?

Regards
Christoph

The space in between belongs to the one on whose land it stands - materially it consists of nothing, and no one has built it; ideally, the walls each stand on the land of one of the involved neighbors. In the worst case, both walls stand "over there," and you do not even own the space between your actual boundary and the wall supposedly yours.

Thank you for the response but sorry, I can't make sense of that. Maybe I expressed myself incorrectly. Of course, it's about the border line. It was logical to me that the ownership rights result from that.

So how do you determine the course of the border through such walls if it is not visually recognizable?

No, logically not everything in the mix of ownership, tolerance, and deadlines is clear – also, a wall "on the boundary" should be considered somewhat differently than a hedge in the same place. You can refer to cadastral maps, but maximum clarity is only provided by the surveyor (since boundary stones themselves can sometimes be misplaced). Wait for , then there will be clarification, as understandable as that can be in a matter that often only appears to be clear.

Who can provide binding information in such a case?

A publicly appointed surveyor (öffentlich bestellter Vermessungsingenieur) or

the Office for Land Management

There is also an address list of publicly appointed surveyors in Hesse. Without Corona, one could go to the responsible AfB office and have the survey map shown and explained, provided there is a qualified building survey for the buildings. If this does not exist, only the local surveying by a publicly appointed surveyor or AfB helps.

Thank you. Then I wasn’t wrong about AfB.

There is also an address list of publicly appointed surveyors in Hesse. Without Corona, one could go to the responsible AfB office and have the survey plan shown and explained, provided there is a qualified building survey for the buildings.

I will ask. However, I would be surprised if it was ever "qualified" surveyed, as there likely hasn’t been any reason to do so for 100 years.