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317,027 tall buildings

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usage level

The importance of an intended function within a place, distinguishing main purposes from subsidiary ones.

Each usage in a place or object is assigned a usage type, depending on whether it constitutes the main purpose or a subsidiary purpose.

A place can have more than one intended function, with different degrees of importance. The function itself and its importance within the place are separate aspects.

A primary use contributes to the place's main purpose, while a secondary use is subsidiary. Their detailed area conditions distinguish those degrees of use.

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