Please excuse the newbieness of this question, but is it possible to trade bases between human players in multiplayer games, and if so, how? There doesn't seem to be an option to do so in the negotiations screen that is used between human players.
Short answer: no.
If you want to trade bases, you have to do it the good ol' fashioned conquest way. (or leave it in drone riots and hope it revolts to the other guy, could work if he is the closest faction).
I believe this was done to prevent two humans from running circles around the AI by swapping bases