Most major magic operations in corps run in the same tradition, Atzlan being a good example, certainly they have magic supply rooms, and I'm sure they range in value like any other asset storage system, the valuable ones would very secure, probably high rating lodges, complete with significant tech security, serious warding, and I'm sure for really high end ones some kind of serious non-standard defense, contracted small dragon, great form spirit, maybe some kind super golem. Whatever suits that magic groups Idiom.
Tech wise could easily by as High Zero/Zero Zones, though I doubt it.