Getting collision size of a building?

Is there a way to get the collision size of a building? I made a destructible regrowth trigger, but they regrow right through my buildings. I can remove them from the game but i am trying to find a way to do it using a region the the same size as the collision of the buildings being built. I can make regions using the set sizes but i was just wondering if anyone knew how to call that data through an action in a trigger.

Please move this if it should be in another category. wasn't sure where it should go. probably should have went to the JASS forum since i'm pretty sure the GUI has nothing like this at all.

can you explain your problem more. I dont get it.

What's not to get?
He wants to know if he can call up the data for the collision size of a building and how.
Sorry if that sound flame-ish.

I'll start looking around my collection of bookmarked threads.
Though I don't know much about JASS yet.

yeah i'm sure it will have to be done with jass, if it can be at all. I'm just trying to avoid having to destroy too many of my destructibles at one time. I may end up just have to use a starndard size that will encompass the largest buildings and leave it at that.