Sloped floors in an old multi family

[Christopher Madden]

I am investing in a  3 unit on Friday and the house is 120 years old.  One of the units a 2 bed room, has sloped floors throughout the unit.  I have already inspected and the house is structurally good settling occurred decades ago.  Looking for feedback about should I level the floors, my contractor came up with a sound plan to level the floor.  Just not sure if I want to spend the money to level the floor on a c- property that I only need slightly below average market rent to cash flo $500 monthly.  Thanks for the feedback!