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underground building

A building divided into regular floor spaces which does not have any usable floor space at or above ground level.

An underground building is a constructed space which has regular floors underground but not above the ground level. It may have a very small entrance facility or skylight above the ground, but must be primarily underground.

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Deutsch: Ein Gebäude mit mehreren Geschossen, das keine Nutzfläche auf oder oberhalb der Erdoberfläche besitzt.

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