Finaly got a building in.. Now how do I remove a poi that is in the way?

[lil_joha]

finaly learned how to place my build in a usable game.

 

But placing it I found some of the other building where a bit close.. some .. were my mistakes with rotations and such .. how do I remove the prefab bounding blocks of these messed up placements.

 

also where is the best place to stand for a large prefab insertion.. north south  west oreast or nw corner se corner ect. so that I dont have the placement kill the already place poi's?

 

[JCrook1028]

I believe the relevant coordinate is the SW corner.