The Matrix Online Server Emulator

Machine Stronghold
-location Downtown
five type of layouts of the Stronghold I have found
-2254 1 -158
-2271 1 99
-2274 1 349
-2261 1 608
-2278 1 842

there are multiples of each version of each layout "stacked" on each other
just change the Y and you will find them.
I did not find any below 1 and it looks like 109 is the highest for one type and 72 for another.

I think the "multiple stacks" of the org areas are so multiple people can run the org key at once and not interact (since they won't all be on the same mish team)