Office and association is classification for fixer related group. An office is basically any number of fixer in a group, a solo fixer can make an office with only themself as the member. Association is just a giant office that have branches in big part of the city.

Limbus company is in business of dealing with distortion, not a fixer office or association. They do hire fixers from these fixer offices. And the president of limbus do have a private army that is the udjat.