Some people call them “ghost offices”. These are buildings in suburbs and secure locations that are kept quietly on standby – for years on end. You might walk by one and never pay any attention to it. They have little or no signage. A high fence and some security cameras, perhaps.

But inside are rows and rows of desks just waiting to be used in the event of a disaster – a safe place to bolt to if the regular office is inaccessible or even destroyed.

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