Floor plan for a two-family house as a semi-detached house with 160 sqm in Bavaria

Hello everyone,
it would be great if you could take a look at the floor plan and share your opinion.
Criticism is also welcome.
We want to build a new house with 160 sqm of usable space and an attic as a cellar replacement. However, this house should later have the option to be rented out (i.e., 2 separate apartments).
Currently, we need the space for the 2 children.
Thank you in advance for your comments.

Development plan/restrictions
Plot size: 580 sqm No. 13
Slope: no
Floor area ratio 0.4
Floor space index 0.6
Building window as soon as development is complete, building line and boundary
Number of parking spaces -> normal parking space regulation
Number of floors: 2 full floors
Roof shape: no restriction
Style
Orientation: south (10% deviation)
Maximum heights/limits: ridge height, here max. 10 meters above street level
Roof pitch min. 8%

Requirements of the builders
Style: modern, roof shape: butterfly roof, building type: two-family house
without cellar, 2.5 floors
Owner occupancy 4 persons, ages 31, 30, 10, 8
Rental house 4-6 persons,
Space requirement per full floor 80 sqm usable space, attic storage (cellar replacement)
Office: child's bedroom or home office?
open architecture
modern construction method
open kitchen, cooking island
Number of dining seats 6-8
no chimney
Balcony in attic, roof terrace on the garage
Double garage, parking spaces
Utility garden

House design
Who designed it: self-designed
What do you particularly like? Why?: Open, usable for the current purpose and later option for rental, modern construction, optimal use with as little wasted space as possible
What do you not like? Why? The corridor is partly somewhat narrow or angled
Price estimate according to architect/planner: 450K
Personal price limit for the house, incl. equipment: 500K
Preferred heating technology: air heat pump with photovoltaic

Why did the design become what it is now? The building must be usable both for owner occupancy and for later rental
What do you think is particularly good or bad? We are currently only looking at owner occupancy and the option for later rental -> realistic and sensible?

The - presumably south-facing - plot plan shows detached single house symbols. I also consider the plot size sufficient to build a detached house. Does the development plan give the option E/D, and is there already a partner for the other semi-detached half? - with the extravagant gable side, that one will not be easy to find. Someone who is only in their early 30s now is more likely to build again "after the children" than to separate the surplus space.

Good day 11ant, the partner has already been found. A duplex may be built and has already been added to the development guidelines. Yes, we will probably build again afterwards and then wanted to rent this house with 2 floors. Best regards Carina

the partner has already been found

That is very good. Then plan (and ideally also build) together with him. The same planner and preferably also the site manager, even with separate contracts. The critical points are the connection side – concerning both the house and the terrain modeling – and the question of basement construction. A mixture of building methods (i.e., one neighbor building with stone and the other with timber framing) is possible, but the gable profiles should ideally be congruent.

later the option for rental (i.e. 2 separate apartments)

In my opinion, a crazy idea, since single-family house floor plans and two-apartment floor plans almost never fit together without compromises. What is the bathroom in the attic for? has already addressed the legal issue: is it even possible to fit 2 residential units into the semi-detached house?

@11ant has already addressed the legal aspect: is it even possible to fit 2 residential units into the semi-detached house?

Where did I say that? - 2 residential units are regularly allowed in semi-detached houses as well.