Additionally, there is also the master key system. If you are only swapping out a few locks in the office, consider turning one of your keys into the master keys and rekeying the rest of their respective departments.
The Master key fashions one key to opening every door in the office even when multiple locks are in use. Additionally, this can be a great investment as more people will be able to have access still, but a limited form of access giving one person the complete power to use their key wherever.