I wouldn't run, I'd just make sure there's no active infestation and that it can be repaired.

If the inspection did not reveal active infestation, it may be a non-issue as long as the header is still functioning as intended.

I have experienced this in the past with a tenant that lived on the third floor, and their infestation ran down into the second and first floor apartments below, as well as the neighboring third floor apartment - and ALL were occupied.

We were told this solution was arrived at after a decade of silver fish infestations and excessive clogged sinks and toilet overflows.

Mouse infestation due to food all over the home.

I agree this is shark-infested water.

Another tenant in a duplex that I kicked out (inherited tenant) because they infested the whole place with fleas ...like serious horrible fleas that had to be sprayed 4 times to treat after they moved out.....from their dirty smelly dogs ...that smelled like dirty dog the first second you walked through the foyer and they had a horrible dangerous dog that was vicious & large and go after repairmen or anyone it saw.

You do need to be aware where the drug/gang infested areas are. 

Best bet to investors is 43613 and anything along the Ohio side of the Michigan line into Sylvania and beyond. 43606 is Toledo Public but lots of businesses there around the hospital, 43607 is Toledo Public but gets good rapidly east of it (other side of Holland Sylvania road on that map). 43609 is gang infested warzone and I would highly recommend staying away.

It isn't obvious visually to know where the crime infested areas are.