A familiar office: Safety and security, as much emotional security as job or financial security.
A strange office full of strange people: If the dreamer feels comfortable, new friends are in his immediate future.
If the dreamer feels lost and out of place, then he should take a good long look at his current circumstances – work, love, friendships – and see if they are serving him.
Astrological parallel: Taurus Tarot parallel: The suit of pentacles