Extraterritorial property is not "anything a AAA owns" (or it shouldn't be, anyway).

>>>>>[Translation follows. "Continuos and contiguous" means
the area invlved must be recognizaple as a single area distinct
from its surroundings. Thtow up a fence around a track of land, or
lease an entire floor of an office building, and it's "continuos and
contiguous." As long as you can see some kind of intuitively
obvious distinction between corp property and surraunding terri-
tory, like "the tenth floor as opposed to ninth floor" or "all the
offices that can only be reached via the Gaeatronics lobby." the
area qualifies as extraterritorial. A hypothetical Yamatetsu rep who
shares a bullpen style open office with reps from other corps
couldn't claim her desk is extraterritorial, becouse you can't see a
clear distinction between her territory and everyone else's. It
sounds complicated, but the "intuitively obvious" rule makes a
good guideline.
"Recognized" means the are must have official and public
recognition as corp territory. for example, MCT can't open up a
secret office under the name of a local sole proprietorship and then
claim extraterritoriality for it. It's not recognized as MCT turf, so it
doesn't get those benefits.
"Long-term" means an official lease must exist, signed by a
duly authorised officer of the corporation, A couple of cort cases
tried to hash out exactly how long the lease has to run to qualify,
but the corp has to have the lease with the officer's signature. That
means a Renraku suit can't stand in the middle of his living room
just as Lone Star goons kick down his door and claim his apparment
is Renraku corp territory. That's how extraterritoriality works.]<<<<<
-Legal Beagle (17:38:oo/3-18-54)

This also means that AAA-Corporation's subsidiaries that aren't AA-Level don't have extraterritorial power either.

Unless they directly associate themselves as a subsidiary. Results vary by corporation - Azzie subsidiaries distance themselves from the parent corp. Others do not.