Can someone give me advice concerning sloped floors?

[Lea Lenz]

Hi there, I am a new investor working on my rehab quotes. I am currently working on a property that has sloped floors on both the main floor and basement. Same side of the house but not sloping in the same direction. I don't see any foundation issues and only a few minor vertical cracks on the main floor. I can't see any joists, everything is finished and carpeted. The home is 45 years old. What other red flags can I look for? Should I just budget for floor jacking or leveling of new subfloors? Thank you for any advice!