Subdivision of land parcel resulting building regulations / costs

I have blacked out the plan once and attached it.

Good.

Unfortunately, we have now encountered a "problem" that has kept me from sleeping peacefully for a few days.

You can sleep peacefully again. I see no problem. The building envelope is very large, the existing floor area ratio is far from exhausted, the minimum distance areas in BW are the smallest nationwide. So the boundary can be "moved" a good deal to the north. Well, the upper floor cannot become a full floor, 30° roof pitch is not generous, the eaves height also somewhat limits the imagination. If the architect is not a beginner, the wishes should be feasible, provided there are no severe restrictions in the textual regulations.

The separated parcel does not necessarily have to be merged with the other parcel. It is also permissible to own 2 adjacent plots and you do not have to put up a fence between them ;-) . This could potentially save land registry and notary fees, since a merger is not necessary. A merger would only be required if new buildings are to be constructed on these plots and the floor area ratio or setback distances are to be fully utilized.

The consolidation would only be necessary if new construction is to take place on these plots and the floor area ratio or distance areas are to be fully utilized.

I suspect that is the motive behind this reallocation of the "lands".

I understand it more like the border is supposed to be moved south.
So 222 should get more and something should be taken away from 219!?

I would have thought 222/3 wants to keep a bit more garden and therefore 219/2 should be reduced. If of course 222/3 is also newly developed, a merger of 219/2/Rest and 222/3 will rather be necessary.

I understand it more as the border is supposed to be moved south.

I would have thought 222/3 wants to keep a bit more garden.

You are completely right. I read it and the information was incorrectly put together in my head. Depending on how much of 219/2 is to be nibbled off, it could still get tight with the floor area ratio on the remaining piece.