Freaking out... possible huge foundation issues

[Julie Hill]

After all the education we've done and a few projects under our belt, I think I have a nightmare on my hands.  We are renovating a duplex out of state.  It was purchased in December (from a wholesaler) and I was very hands-on in the beginning, visiting the site every 2 weeks or so.  Then covid hit.  My contractor has been updating me along the way and of course, it is way past deadline.  I finally drove down this week to check on it (instead of flying) - it's a 2-day drive.  I am freaking out because now that the house is close to being done, it is very apparent there may be significant foundation issues.  Now before anyone yells at me for not knowing this before the project got started (or buying the place), know that we did check for basic foundation issues.  there were no cracks or anything in the brick or walls.  One side was completely burned out by a kitchen fire, and the other side was occupied by hoarders so there wasn't much we could "check" anyway.   The flooring is now installed and my contractor didn't bother to tell me "hey Julie.. the floors are sagging, are massively uneven (especially on the 2nd floor), and the brick pillar holding up the roof outside is crooked".  This house was built in 1948.  I am scared that if we don't fix this, the bank won't refi it (we are going to keep this as a rental).  I feel like the issue is "beyond" normal old house floors.  Does anyone have experience with this?  I will have a few structural engineers come out and look at it this week but I'm sure it would cost 30-40k to fix it.  I'm just guessing after having to do it in other properties.  But those were flips, not buy & holds.  Just not sure what the bank will say. Ugh :(