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A subbasement is a floor or set of floors below the main basement floor. Basements commonly have a small amount of vertical space located above ground; subbasements are therefore entirely underground. Subbasements have uses similar to those of basements, such as storage, but function less often as living spaces compared to main basements.

Building a subbasement is more difficult, costly, and time-consuming than building a basement as the lowest floor. Subbasements are even more susceptible to flooding and water damage than basements and are therefore rare, except in dry climates and at higher elevations.

Some famous landmarks contain subbasements; the subbasement of the U.S. Capitol Building is used as storage and that in the White House is used to store guest items. The button in the elevator that takes riders to the subbasement when pressed would read "B2" or "SB".

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