Queensland Height Limit Analysis

I live beside a sloping block in Queensland that already holds a residential building, and I would like a clear, planning-grade explanation of how high any future redevelopment on that lot could legally rise. My main concern is the potential impact on my views, so I need more than a generic overview—I need the exact height rules that apply on that parcel and, crucially, how “natural ground level” must be measured on a steep site under the relevant planning scheme. (I'm aware that the likely building height limit is 8.5m but from what level is that calculated given there is an existing building on the block for which some "cutting in" may have occurred in the past). To be useful, your advice must reference the precise sections of the local planning scheme (Shire, City or Regional Plan), State Codes or overlay maps that control building height for this zone. Please include: • The formal definition of “natural ground level” used by the authority and the accepted surveying method on sloping land. • The maximum permitted building height for the lot (in metres and storeys, if both apply). • Any exemptions, averaging provisions, or discretionary variations that could allow a higher structure. • A short rationale explaining how you arrived at those figures so I can explain them if challenged. A concise written memo (PDF or Word) with annotated extracts or weblinks to the regulations is perfect; no glossy report required. GIS screenshots or contour sketches are welcome if they make the explanation clearer. If you have prepared similar height assessments in Queensland before, that experience will be invaluable.