More Awesome Than You!

I'm back to simming after taking some time off. I was going to play my old custom neighborhood but I found that didn't have enough room for all the new community lots, so I am starting a new neighborhood. I want it to contain only my custom sims, no townies (I don't mind npc's.) I started a new neighborhood, did "destroyallhumans" and moved a family in. Instantly the game added several households of townies to my neighborhood. How do I stop this? I know that in my old neighborhood I had fixed it so no townies would appear, but I can't remember how I did this. Do I have to remove all houses except the ones with my sims in them? This is sort of a pain, since I'd like my sims to be able to move around on their own, but I sort of remember doing something like this before. I've searched this board and the awesome mod board and haven't found any advice. Thanks in advance.

Edit: Ok, after more research I think this was happening because I hadn't turned off EA story progression. I did say it had been a while since I played the game.  :)

Edit 2: I wanted to modify this because I have since learned some things -- Turning off EA story progression also turns off awesome mod's story progression, which was not my intent. To keep AM's story progression without townies I had to remove all the empty houses in the neighborhood and convert the lots to community lots. I tried using NRAAS's register to stop immigration but that didn't work.