I would like to put in a request or suggestion that building exterriors be added in a future update. In addition to that, it would be cool to get to choose what the exterrior texture ie. building material is made out of. Such as all glass, stone, brick, concrete, etc. I think Yoot Tower (the late 90's sequel to SimTower) handled it in a pretty good way. I've attached an image of how it was implemeneted in that game as a reference.