Bringing units up to code

[Kyle D.]

I am very close to purchasing a fiveplex. All 1 bedroom/ 1 bath units. Built in 1973 and all original. I was advised that units would need to be brought up to code. I plan on renovating and before I inquire at the county building department I was wondering what may be needed.

I'm know GFI's and and smoke detectors are mandatory but what else should I be aware of?

Thanks