Trading is a pain in the neck. Once I've made offers, there's nowhere to see which are active, and if the other person doesn't do anything, my resources are tied up for 8 hours, and might even be discarded if I don't have room for them when they finally return.
At present the Branch Office has no options in its panel apart from tearing it down. How about adding a list of current trade offers I've made, with the option to cancel them?