The exact number of storeys above ground is clear from survey or drawings. The exact number of the floors above ground includes the ground floor and floors above. It also includes storage and mechanical plant levels only if these cover over 50% of the plan area, but does not include basements below ground. If the building is stepped in height, then record the highest part.
where n= maximum number of storeys above ground level
Example: HEX:2 (exactly two-storey high building)
This is an eight storey building in Morocco (C. Scawthorn)