You can always save the lot full of whatever, place a new lot that is the same size, and place the lot full of whatever on and rotate whichever way you want. 
That would work, Zapkid, but then, even though my stuff is facing towards the front (ie. the road), the lot footprint isn't lined up with the stuff. Also, it's a contest build so I'm hesitant to save and replace in case the lot value changes. I hadn't thought of this method though, so thanks for the reminder.
Before you save it, you can shift+click the ground on the edge that you want to be the front and 'set as lot front'. That's about as much as I know without running the game and trying it for myself. I thought you could grab lots in edit town mode by using the hand and then rotate them that way. But as I haven't tried it, I'm probably wrong.
This is what I thought I had read on the forum somewhere, but I couldn't remember what the process was. I'm assuming you need testing cheats on for this. I'll try it tomorrow if the baby will give me enough time. I have saved it already so hopefully that doesn't make a difference. Thanks.