Floor slopes downwards!

[Sebastain Honorat]

Hi Biggerpocket Community,

I've been a fan for a while and I finally started investing in real estate. I'm currently closing on a fourplex but in one of the bottom units, the bathroom and kitchen slopes down, and the tiles in the kitchen are cracked. The owner installed push piers because the foundation had settling issues but the tenant wasn't there when the push piers were installed and she said she got the unit that way. They only installed the piers on one side of the property. There cracks on a lot of the walls but they're supposedly pre-push piers. They did multiple tests for the previous buyer that said the foundation is ok. Aren't the piers supposed to re-level everything? If not should I apply self-leveling on the floor or redo the subfloor?