ᐅ Development plan eave height – maximum visible wall height

Good evening, we are planning to purchase a plot of land and since it is on a slope, we are considering a building with a basement, ground floor, and recessed top floor, so 3 levels in total—2 full floors and 1 recessed floor.
As we have not yet contacted an architect and unfortunately do not fully understand the zoning plan, it would be great if someone here could take a look at the excerpts from the plan to tell us if this would even be possible.
It is not clear to us whether the ground floor level would then be in the basement or at street level.
Thank you in advance.
We look forward to all replies.

Without the development plan itself, nothing can be said here. Especially on a slope.

Thank you for the quick response. The 2 images/attachments are the relevant excerpts from the development plan. What else is required? The plot has a steep slope, estimated at 3-4 meters (10-13 feet).

Here is a quick sketch of the issue

@Somatra ... without a site plan showing the property, your text excerpt cannot be interpreted, as the text refers to different construction phases.

The plot is located in WA1 and is downhill from the access road, in area b.