Gap in building / Access for surrounding properties / §34 Neighbor development

Good day everyone,
after reading along for a long time, the opportunity has arisen at short notice to buy a building gap.
However, some questions still arise here. Maybe you can help me.

Plot:
513 sqm, well shaped, south-facing, near Scharbeutz (5 minutes drive)
positive building certificate for the current owner to find out if it is building land (for a large single-family house)
see pictures

Access:
on the west side is the access road for the two surrounding plots with house numbers 56 and 58
according to the owners, these belong to the offered plot, the maintenance is then shared by all 3 parties
due to the division, the 3m distance to house number 56 is not given. According to the building authority, no problem if I keep the 6 m distance to the house (as drawn)

Buildability:
Since there is no development plan, buildability is based on § 34 neighboring buildings.
I have uploaded the neighborhood. In my opinion, only 1 full floor is allowed here. However, the houses in the neighborhood are partly extremely tall (very steep gable roofs with large and converted attics).
We are planning about 120-140 sqm of living space.

Now my questions:

1) How can I find out more about the soil condition? The owner supposedly knows nothing about the soil. The building authority could not give me any information.
So I only have the paid option of a soil sample?

2) Do you see the possibility to build a single-family house with 2 full floors and a 15 degree gable roof after all? If not, we do have an alternative (visible under attachment idea), but this would be significantly more expensive.

3) The access road worries me. We simply do not need it and would have to be involved in 1/3 of the maintenance. Furthermore, it is relatively dusty and stirs up a lot of dirt. How would it be if we said, for example, that we want it paved. Can we force the other parties to participate in the costs with 1/3 each?
My absolute wish would be if we do not purchase the access road and one of the other parties gets it. We then pull our fence and that would be that.

4) How close can the house be built to the street side? We are not fans of front gardens and would rather enjoy more garden with a south-facing location.

Since I would like an overall overview of the topic, I have summarized all questions in one thread, even if not every question fits thematically to this area. I hope this is not a problem.

I look forward to your suggestions.

In my opinion, only 1 full storey is permitted here. [...] We are planning with approximately 120-140 sqm of living space. [...] 2) Do you see the possibility of building a single-family house with 2 full storeys and a 15 degree pitched roof? If not, we do have an alternative (visible under attachment idea),

What would Plan A look like for this stylish (but probably significantly exceeding 120 to 140 sqm) Plan B? I clearly see a. definitely not a two-storey building, b. definitely not such a princely eaves height, and c. something around 30° roof pitch.

1) How can I find out more about the soil conditions?

Disconnect the neighboring houses and ask if they still have documents.

2) Do you see the possibility of building a single-family house with 2 full floors and a 15-degree gable roof after all?

Are there such buildings outside the photos in the neighborhood? Otherwise, just ask the city directly.

3) The access road worries me. We simply don’t need it and would have to deal with a third of the maintenance. Furthermore, it is relatively dusty and raises a lot of dirt. How about if we say, for example, that we want it paved. Can we force the other parties to each contribute a third of the costs?
My absolute wish would be not to acquire the access road and that one of the other parties gets it. We would then move our fence and that would be the end of the topic.

That now strongly depends on how it is regulated in the land register and the conditions on site. Is a right of way registered for the neighbors? Can the neighbors also reach their property without the access road? Of course, you can also buy the piece and still put up a fence. That might be more advantageous because of distance regulations, but I’m not really familiar with that. You can’t impose costs on anyone if they don’t want to pay.

4) How close can the house stand to the street side?

If in doubt, like the neighborhood. Or ask the city.

I am too stupid to quote properly. Therefore, I will try it this way:

What would plan A look like for this nice (but probably significantly exceeding 120 to 140 sqm) plan B?
I definitely see a. no two-story building at all, b. definitely not such a princely eaves height, and c. something around 30° roof pitch.

Solution A is relatively simple. See photo. So basically plan B without the extension. Plan B wouldn’t even be our house, that was just a solution I found where someone turned 2 full floors into 1.
After we know what we are allowed to build, we would intensify the planning.

Tassimat:
1) Good idea. I will do that, since the left neighbor from the street (gray house) must have built relatively recently.
2) No, unfortunately not. But opposite are very tall single-family houses, roughly 12 m high. But with very steep gable roofs. So I assume those are also 1.5 stories.
3) Thanks for the tip. I will request a land register excerpt.
4) The city says they only regulate the depth. Therefore, I assume we would also be allowed to build directly on the street. The guy was unfortunately not very talkative.

Through the division

Is one planned?

Do you see the possibility of building a single-family house with 2 full floors and a 15-degree pitched roof?

No.

Can we force the other parties to each contribute 1/3 to the costs?

That depends on whether there are agreements regarding this and, if so, whether these also apply to a purchaser.

My absolute wish would be that we do not acquire the access road and that one of the other parties gets it.

If that option exists, that would also be my advice.

where someone changed from 2 full floors to 1

Number of floors is irrelevant according to §34. What matters is the eaves height, and this is the same in both variants and IMO not enforceable.

Therefore, I assume that we could also build directly on the street.

I don’t. Your cadastral excerpt is somewhat sparse but in the photos I clearly see factual building boundaries.

Uff, I think here wish and reality diverge quite far apart

The two buildings shown are never and never only 120-140sqm in size.
The glazing is also illogical given the surroundings.
The building line will be dictated by the neighboring house, one will not move up to the street.
Building too high etc.