Quote Originally Posted by Mr TAS View Post
Upgrading to level 10 gives a bonus unit of +5% ground defense. This may be a silly question, but if you upgrade two of these buildings to level 10, does the bonus stack? Will it end up giving you +10% ground defense?
You will get only one unit. So there is no bonus to stack.
You get units with passing LTQ by building and upgrading building (s). Once 1st building is upgraded to level 10, LTQ is finished and there is no goal to upgrade 2nd building.