I'm sorry, I had it in the OP, apparently I cut it by accident. The eldar hive city counts as command bastion, both Imperial hive cities also. I'm leading a conference so can't really pull all the sources, but it is - chaos 1 command bastion, eldar (effectively) 2 command bastions, imperials ((effectively) 2 command bastions and 1 power station. If you look in the rules packet it will show the bonuses.