What questions should be asked to the building authority?

Then go alone. Read up a bit via Google. Keyword: building without a development plan.

The note about [Paragraph 34] was very helpful though. I just looked it up. Many arguments came to my mind about it as well. But basically, I am dependent on their mercy, right?

Yes. 34 is so vague, it is always negotiation-heavy. That’s why it’s the architect or BU who has known Willy at the office for years and is on a first-name basis with him.

But there are already development plans. However, they are very vague. Or rather, the neighboring development does not correspond to them. Which raises the question of how exactly they are applied.

Tihihi the Willi at the office. How do I find him?

There is even a building permit from 2001 that was approved. Why it was not built, we do not know. But I have located the architect. Should I call him sometime...?