Plot ratio after actual division of the property for a semi-detached house

Hello everyone,

my brother and I recently purchased a plot of land of about 596 m2. We are from Blaubeuren (Baden-Württemberg). Our wish is to build a semi-detached house. Both halves should be as equal in size as possible. Since the plot is "trapezoidal" and we used the blue building boundary as a basis (for a real division), one half is smaller - about 246 m2.

A floor area ratio of 0.4 is specified here. My architect says that the smaller half will cause problems after a real division because the floor area ratio will be exceeded (floor plan: see attachment). It would also be important to ask whether exceeding the 0.4 by garages, driveways, etc. (floor area ratio 2) is not allowed? We are forced to build a transition path here (see attachment).

I hope you can help me with this. Looking forward to suggestions.

If the total floor area ratio is correct (I didn't double-check), I would submit the application and see what the building authority says. If you are unsure, you can also clarify the situation by submitting a preliminary inquiry. If they say no, the division will have to be different or one half smaller.

If it is exceeded, it is exceeded and will probably not be approved. Simply sharing ideationally should not pose a problem.

If it is exceeded, it is exceeded and will probably not be approved. Simply share ideationally, should not be a problem.

And how? Hand over the transition path to the smaller property?

And how? Transfer the transitional path to the smaller property?

Or just enough of it so that it is sufficient.

And how? Transfer the access path to the smaller property?

No, regulate the entire property only ideally with special uses. Also the path.