Long story short.. Boost buildings do ABSOLUTELY NOTHING to help on the boss event.
Upgraded my airship hanger from 5 to 6. Made sure I was fighting a boss when the upgrade completed...
My profile before upgrade completed:
Profile after:
Boss event cash hit before completion:
Boss event cash hit after upgrade completion:
I know a lot of us already knew this information but I have seen a lot of threads where people say "what can I do to beat the boss" and someone always says upgrade buildings.
Personally I think if special event units/bonuses count toward the boss, then boost buildings should!!