Property the Second - Please Assess

So does that mean you have to keep a distance or model the terrain step by step?

No, I didn't read carefully. It's an "or" connection. Only if you exceed the 2.5m height does the 25m² limitation apply.
Maybe the wish was that it is forbidden, father of my thoughts, since I don't approve of such terrain alterations at all. I just imagine sitting as your neighbor in my garden looking at a 22m long, 2m high L-stone wall.
What I also hadn't read yet is point 6 of the textual provisions:
Excavations and fillings of terrain are permitted outside the buildable
property area up to 1.50m, measured from the existing terrain.
So talk the project over with your architect. He gets paid for reading and therefore shouldn't overlook anything.

No, I didn’t read it properly. It’s an "or" connection. Only when you exceed the 2.5m height does the 25m² limitation apply. Maybe the wish was that it is forbidden, father of my thoughts, since I don’t hold anything of such terrain alterations. I’m just imagining sitting as your neighbor in my garden looking at a 22m long, 2m high L-stone wall. But what I hadn’t read yet is point 6 of the textual provisions: Excavations and fillings of terrain are also permitted outside the buildable plot area up to 1.50m, measured from the existing terrain. So discuss the project with your architect. He gets paid for reading and should therefore not overlook anything.

Thank you, we have in fact consulted an architect. Let’s see what the professional thinks. I have to admit that unfortunately I also hadn’t noticed the last passage in the textual provisions until now. That changes everything again. Meanwhile, we also have elevation plan data from the development plans. The plot is clearly sloped, with a diagonal elevation difference of 3.5m (!) from the lower left to the upper right corner. The municipality’s passage would practically exclude obtaining at least a partly level plot here through terrain modeling, wouldn’t it? We don’t necessarily have to pile up as high as possible along the boundary. But as far as I understand, even a terracing over the plot wouldn’t be possible with that addition?

It is obvious that one levels a limited area of their property for a terrace, a pool, or a table tennis table. But a hillside property is not suitable for playing tennis and should not be adapted accordingly either. The restrictions imposed by the development plan here, which I consider quite generous by the way, are IMHO completely legitimate. Hillside properties have their own charm with skillful adaptation to the natural terrain. Those who do not recognize or like that should invest more time in searching for a more pleasing property.

It is obvious that one levels a limited area of their property for a terrace, a pool, or a table tennis table. But a hillside property is not suitable for playing tennis and should not be made suitable for that either. The restrictions imposed by the development plan here, which I consider quite generous by the way, are IMHO completely legitimate. Hillside properties have their own charm when cleverly adapted to the natural terrain. Those who do not recognize or do not like that should invest more time in searching for a more pleasing property.

Thank you for your opinion on this. Under certain circumstances, it may have been somewhat naive of me to believe that the terrain could be modeled so extensively. However, this was not an unconditional prerequisite for me to purchase the property. I am trying to explore the possibilities before doing something like that (including the extremes).

Be that as it may, we visited the architect and have now designed a possible solution that we like very much. The advantage of the property is that even with a generous single-family house, we are still very flexible within the building window. Therefore, the possible design provides for placing the house so that the main terrace will be located at the right corner on the (south)eastern side above the house. The advantage here is that there is no construction on that side, and it is set back from the row development. The street in front of the house is relatively narrow and designed only as a resident access road. This still leaves 7-8 meters for the terrace. The terrain will essentially be left as is and will also be "integrated" through the house with a garden living floor. This means that in the dining room there is an open space with a gallery where the living area for TV, couch, etc., is located at the basement level. This, in turn, connects to a second garden terrace, which is to be screened by planting, a pergola, and/or a small wall. Otherwise, the terrain offers the possibility to move around the garden all around the house. On the direct border to the neighbor below, an attempt will be made, taking into account the setback areas and planting requirements, to provide screening through medium and taller planting. We have also considered the sun positions on the west side for the "worst-case" variant on the equinox days. It turned out that we will usually not have low-lying evening sun in the garden below, but otherwise, we can expect surprisingly long periods of sunshine. In the upper floors, the view is naturally significantly better due to the difference in height.

Therefore, we intend to commit as soon as we have final approval from the bank. However, I view this as unproblematic because last year we already received the green light for a larger project (due to a more expensive property).

Another question: We have engaged the architect on an hourly basis for this. The likelihood that we will also sign an architectural contract with him is high. May I post the designs here in the forum, or should I refrain from doing so?

Sounds very reasonable. I'll keep my fingers crossed that the purchase works out!

Thank you. I will definitely report back and hopefully be allowed to start a new planning thread soon.