As i'm no longer a diamond supporter i'm bound to lose my homes is there anyway to keep the one you want or is it at random
Currently, you do keep them. There has been talk about you loosing them eventually, but as of right now, you can keep all 4 indefinitely. (This is the answer I got straight from IcC)
We had a recent admin meeting and decided that you are able to keep any residences gained as a supporter even if downgraded as long as it falls within our regular derelict policy. Meaning, if you go inactive longer than 10 days, then they are up for grabs and could be reset, but otherwise, they're fine.