2-family house: Border construction adjacent to neighbor's house about 70% more expensive!

So, I'm checking back in. After an intense conversation today, a lot was clarified within the family. It wasn't a big deal.

-The SE are taking their own loan for about 1/3 of the amount (there is a question whether we might get that more precisely from the company)

-The SE are owners of the land and the house. Then the OG and DG would have to belong to us notarized.

-At the moment the house is too expensive for us and we will have to make some compromises... otherwise we won't be able to finance it. Especially regarding the square meters, we want to reduce to 120-130 sqm in OG+DG.

Financing of our part: -I’m 27, she’s 26 with desire for children (2x) -monthly net income €4300 -equity €120,000 Within 15-20 years I would like to be finished with it. Assuming the house, after reductions, now including all additional costs and outdoor facilities, amounts to €600,000. We need a loan of €400,000 minus €100,000 equity = €300,000.

That would be €1500 monthly.

Is that even possible?

-The SE are the owners of the property and the house. The OG and DG would then have to belong to us notarized

Then get some advice to see if the bank will go along with it. This isn't a classic division according to WEG. I mean, without an entry in the land register, they won't give you any €. And if the property isn't divided according to WEG, your SE and you can only get bad conditions; etc.

And maybe also ask a professional what other disadvantages there might be.

Have you ever been to a bank?

We probably need to follow up on that!

We haven't been to a bank yet. We hesitated because we don't have an exact price yet. For a consultation/offer, we should probably really make an appointment there.
To know in advance exactly how this can be the "cheapest" for all parties.

Do it.

In principle, one can only hope that it somehow works. Not about the amount, but the bank and your SE find a construct with which both sides will be happy.

also go with several.

Oh dear..... I only see chaos and confusion there.

Please read up on the topics of Eigentumswohnungen, Teileigentum, Wohnungseigentümergemeinschaft, Gemeinschaftseigentum, Sondernutzungsrecht.

I believe that you all a) already know what you want, but b) have no idea how it can legally and structurally work at all.

I think that in the end it will come down to a classic WEG. So the land belongs to everyone, division according to value based on living space, the access path and the house are community property, SE gets WE1 and an SNR on the garden, you get WE2 and, if you like, an SNR for one or two parking spaces.

Please report on how it continues...

Oops... luckily, suitable advice on legal structuring was given here. And if you need a loan, the bank only grants it against land registry. So no private agreements.

As already indicated
1. Option: Multi-family house divided according to WEG. Which *imho* is the more expensive option, but offers better potential for utilization in the future
2. Land transfer and 100% financing through you. And rent one apartment to the SE. And in doing so, allocate 100% of the financing costs proportionally to the rented residential unit and then rent it to the SE at 70% (?) of the local comparable rent. As a tax saving model.
But that requires a bit of trust on both sides. Those were the days when blood was thicker than water.