Here's some information about building your own base.
You're building gets restricted so server won't overload on just loading bases.
The building limit gets expanded as you upgrade your Flag at the Office Trader.
As you can see, there's a level 11, but that's not accesible for normal players ( seen the price :P ).
Admins build huge bases for Admin Events, and they often don't fit in a level 10 territory.
See ya on the server :)