Young Blonde Girl With A Blue Fishnet Scarf Near The Old Building

To differentiate buildings from other buildings and other structures that are not intended for continuous human occupancy, the latter are called non-building structures or simply structures.
Structural height in technical usage is the height to the highest architectural detail on building from street-level. Depending on how they are classified, spires and masts may or may not be included in this height. Spires and masts used as antennas are not generally included.
The definition of a low-rise vs. a high-rise building is a matter of debate, but generally three storeys or less is considered low-rise.