Possible Foundation issues?

[Martin Bastida]

I’m looking to purchase a 3-unit building in Chicago. It needs a total gut rehab, which is fine.

My concern is the floor. The 1st and 2nd floor have pretty bad sloping floors. The 3rd floor does as well but not as bad. The building doesn’t have a basement. I’ve never dealt with this kind of situation before. I would really appreciate any advice on who I should contact or what I should to to fix the sloping floors.