That's where my Survival strategy comes in handy. I've actually been planning this for a while. Basically I turn the entire complex into a trading post. The more survivors arrive, the stronger we are. We're on an intersection that can be closed off very easily with some cars/trucks, welding, and elbow grease.
Main rules for newcomers:
1: Those who enter must provide something to pay or trade (Medicine, weapons, knowledge, etc)
2: Those who wish to stay will work. No exceptions. There's something for everyone.
3: All weapons must be handed in when you enter, and will be returned upon your departure. No exceptions.
Then I have a list of laws, breaking those laws will be met with a fitting punishment.
1: stealing: lose a finger of your choice.
2: Hurting someone / breaking someone else's property: A week in the cage on minimum rations.
3: Murder: Popular vote. People decide democratically what to do. Can be you get killed yourself, or you get banished.
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I got pages of this stuff, lol. It's all in my head XD