Problems with a property to avoid when buying

[Collyn Bennett]

I've been looking for my first deal and found an interesting property. It's a house with a detached garage that has been converted into an apartment. Both buildings need to be gutted and completely redone. All the repairs looks like they're just cosmetic. The property is listed at a good price though so even with a good chunk going to rehab the deal works. This would be my first BRRRR property and I can tell just from pictures that it will need a lot of work. My question is what kind of problems should I watch out for due to hefty repair costs or long term issues? Things that come to mind are foundation issues, septic issues, etc. What are things you avoid no matter what?