ᐅ Floor plan design of an urban villa with a recessed upper floor on a hillside

Plot size 670 sqm (7200 sq ft)
Slope: approximately 3 m (10 ft) downward from west to east away from the street
Floor area ratio? 0.4
Floor space index?
Building envelope, building line and boundary? 3 m (10 ft) to the street, 5 m (16 ft) at the garage
Perimeter development?
Number of parking spaces 2
Number of floors 1.5
Roof type hipped roof
Style modern city villa
Orientation main entrance facing north towards the street
Maximum height/restrictions (eaves height 7 m (23 ft) and ridge height 9 m (30 ft))
Other requirements? water protection area

Client Requirements
Style, roof type, building type
modern city villa
Basement, floors: 1.5 floors without basement
Number of occupants: 2 adults and 2 children
open kitchen, kitchen island
number of dining seats 6-8
double garage

House Design
Who designed the plan?
-Architect from a construction company, based on our specifications

What do you particularly like? Why?
Large open living-dining area, integrated garage with access to the utility room, utility room directly connected to the kitchen, and a large roof terrace with a nice view

What do you not like? Why?
The house should be 170-180 sqm (1830-1940 sq ft), now it is 206 sqm (2215 sq ft). Only one corner of the upper floor was set back.

Why did the design end up like it is?
Our wishes were partially implemented by the architect

What do you think makes it particularly good or bad?
Good: large living area
Bad: living space increased by 30%

If you had to give up something, which details/expansions
-could you do without: separate heating room
-could you not do without: open architecture and roof terrace

What is the most important/basic question about the floor plan summarized in 130 characters?

• Where can further optimizations be made?
• What do you find problematic/would do differently?
• Is there another way to access the terrace without the awkward setback of the corner?
• TV wall in the living room? Best location?
• What do you think about the floor plans and overall design?
I am open to ideas and suggestions

Haus am Hang schrieb:

30% more living space achieved

But 30 percent of 180 is not 26.
The cut-off corner on the upper floor is probably due to the single-story design. Overall, the floor plan seems very "open," so a reduction appears feasible at first. Did you commission the architect with this?

What kind of slope anyway? - I see it mentioned in the post title, but neither in the floor plans nor in the elevations...

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Could you add some dimensions to the floor plan?

Where is the slope?

How is the basement going to be used?

So where is the slope then? Either the architect is a magician or he lost it somewhere along the way.

Thank you for the quick responses,
The plot slopes down from the street (west-north side) towards the southeast by about 3 meters (10 feet). So, the street slopes toward the north by about 1.5 meters (5 feet) and then further toward the southeast by another 1.5 meters (5 feet). However, the builder said it is also possible to build without a basement. The slope must be supported with a retaining wall, and the house will be positioned lower than the street level.
I look forward to your feedback.
Thank you