In Escrow, Potential Foundation Issues?

[Monish Anand]

I am purchasing a home built in 1915 in Northern California, it is ideal location wise, size wise, looks wise, recently redone hvac, plumbing, electrical, etc. The only issue I can see is that 4 out of 5 similarly aged homes in that area (1907-1915) have told me they have some sort of foundation issues (floors are not level, lots of slanting). I found this out by knocking on the door and asking. It is too late to get a structural engineer to survey the place unfortunately because my contingency ends on Tuesday and all requests are backed up. My home inspection report pulled nothing wrong with the foundation, he went underneath the house to look as well.

There is an additional room that was built after this house's original construction and the hallway to the room is slanted. Not 100% sure that is because of foundation issues. Some of the wooden foundation structures look solid and I attached photographs. Should I be concerned about potential foundational issues and back out? I wanted to keep this house for 20 years before selling.

Thanks for the help!!