I agree with Necro here (and on a point he made earlier), I know you say it's purely platonic, but your descriptions of her and ideas of approach come off as borderline romantic if not romantic (which causes problems for your actual intentions) and it bothers me because you are currently in a relationship. So I really have to ask, is it truly necessary for you? I'm concerned for you man, because you're stressing over her, how to approach her, and then you're soon seeking new residence, granted you can still keep in touch via phone/internet, but the whole situation just feels sort of unnecessary/problematic (for lack of a better term) as opposed to opting for an acquaintance-level friendship with someone you're likely to not see everyday/possibly often.