Is the exterior wall of an existing property correctly executed?

I'm speaking frankly!?

No, you have every _rough_ detail of the house pulled out of you slice by slice in salami technique.
You don't give any information; instead, one has to question you about every detail. The question then arises who actually needs information here.

The listing is on Kleinanzeigen and doesn't provide more information either.

At least you seem to know the street of the location (which I now know). If all this is enough for you here (you don't have any questions either), then I won't ask for another slice of salami.

No, you make yourself give every _major_ detail of the house bit by bit in salamitechnique. You give no information, instead one has to question you about every detail. Then the question arises who needs the info here. At least you seem to know the street in addition to the place (which is now known to me). If all this is enough for you (you also have no questions), then I won’t ask for another slice of salami.

Someone must have had a bad day. I just asked normally if an experienced person could point out any peculiarities that I might overlook as a layman. Why anyone has to get so pretentious and upset is absolutely beyond me.

Why one has to get so artificial about it,

I am not getting artificially upset, but justifiably so, namely about your demanded time from nice people who want to answer questions and ask further questions so that the question can be answered at all and somehow - whether one then calls these answers from the OP, that is from you, cheeky, naive, or brazen - I'll just say good luck with the house purchase.

I am not annoyed for no reason, but justifiably, namely about your demanded time from nice people who want to answer questions and ask further in order to even somehow be able to answer the question – whether you then call it cheeky, naive, or brazen, these answers from the OP, that is from you – I’ll just say good luck with the house purchase.

You are upset because I cannot ask good questions on a topic that is completely unfamiliar to me, even though I have mentioned this several times. One could also approach the whole subject with understanding, but instead you attack me without reason. Do you think I ask things here just to waste your time? The conversation was friendly and respectful except for your intervention and I thanked everyone for the help.

I would talk to the 6m neighbor, was a house planned there and why wasn't it built, was a house built there and why is it gone, what damages or defects were covered by the insulation, is construction expected in the gap.

I would talk to the 6m neighbor, was a house planned there and why was it not built, was a house built there and why is it gone,

No. I would try to speak to the owner of the empty plot. The only sensible contact person.

what damages or defects were covered by the insulation,

None at all. That is common when an interior wall suddenly becomes a bone-cold exterior wall. It is the only sensible (interim) solution.

Is construction to be expected in the gap.

Ask the owner of the plot. And then forget the answer again, because if in doubt, it has a half-life of 60 seconds and already tomorrow the current owner can build themselves or sell the plot to third parties, who will then immediately start construction.