My neighbor building shed without permit.?

I live in miami and we have like hurricanes right...Well anyways i think my neighbor behind my house is building a shed without a permit..i suspect this because the shed is like right next to my property and it looks like it was made with plywood and looks very cheap..i dont think this "structure" would hold up in a hurricane..and i think the shed will come tumbling towards my house in the event of a hurricane..and the shed is pretty big and i think it would do alot of damage...should i report them or what should i do..if i were to report them where do i call..thanks!