Problems with neighbors due to slipped soil

I do not know the other two adjacent neighbors. Currently, it still belongs to the city, as the plots are only reserved. He said he knows the neighbors, one is even an acquaintance of his. That would be no problem at all. Hm. I am not so sure whether the neighbor in the back, even though he is an acquaintance, would want an approximately 4 - 5 meter concrete wall at the boundary to his garden. If I were to agree to that, I would tie it to a few conditions, such as the costs for the retaining wall being fully covered by him. After all, he wants it that high. But regardless, I want to be sure that, as mentioned, no disadvantages arise for our property because of that.

Have the right granted to you to decorate the wall with graffiti. There are some artists who can do this very beautifully... everything is nicer than a concrete wall.

That would be no problem at all.

So far, it reads as if the neighbor is a very simple-minded person.

But regardless of that, I want to be sure that, as said, no disadvantages arise for our property because of it.

There are terrain situations where unfortunately no other way is possible. On the other hand, although Tox's idea has something, I wouldn't be sure if I wanted to look at such a wall. How high will it actually be? The L-stones certainly don't shine through beauty, but a wall... even painted...? Hmm, I don't know. I can well imagine that the approval of the adjacent neighbor is necessary for a building encumbrance to be registered. On the other hand – and that’s indisputable – a building encumbrance also always means a depreciation of the property in the eyes of some buyers. If you come to the same conclusion, you can sit back because nothing will proceed without your/your consent; nothing at all. Rhenish greetings

Admittedly, this is getting off-topic now, but take a look at what the city of Mönchengladbach has done in the Bunter Garten:



Although I was thinking more along the lines of something like this:

Or plant with ivy

There are terrain situations where unfortunately there is no other way. On the other hand, although Tox's idea has something to it, I wouldn’t be sure if I would want to look at such a wall. How high will it actually be? The L-stones are already not known for their beauty, but a wall... even painted...? Hmm, I don’t know.

Rhineland regards

The boundary height is approx. 167 m above sea level at the lowest point at the very back where his garage ends. He wants to build at 169 m above sea level + 2.35 m garage height. That means at the lowest point there would be a retaining wall plus garage of approx. 4.35 m.

Ivy wouldn’t be so bad at all.